WO2020170824A1 - Electric work machine - Google Patents

Electric work machine Download PDF

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Publication number
WO2020170824A1
WO2020170824A1 PCT/JP2020/004391 JP2020004391W WO2020170824A1 WO 2020170824 A1 WO2020170824 A1 WO 2020170824A1 JP 2020004391 W JP2020004391 W JP 2020004391W WO 2020170824 A1 WO2020170824 A1 WO 2020170824A1
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WO
WIPO (PCT)
Prior art keywords
coil
case
resin
stator
machine according
Prior art date
Application number
PCT/JP2020/004391
Other languages
French (fr)
Japanese (ja)
Inventor
圭 神田
Original Assignee
株式会社 マキタ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社 マキタ filed Critical 株式会社 マキタ
Publication of WO2020170824A1 publication Critical patent/WO2020170824A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
    • H02K9/223—Heat bridges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
    • H02K9/227—Heat sinks

Definitions

  • the present invention relates to an electric power tool, a gardening tool such as a lawn mower, and an electric working machine such as an air compressor for an air tool.
  • a brushless motor is used as a power source in the vibration driver drill, which is the electric tool disclosed in Japanese Unexamined Patent Application Publication No. 2017-7068 (Patent Document 1).
  • the brushless motor When driven, the brushless motor generates heat in the coil, the stator core, the rotor core, and the like.
  • a main object of the present invention is to provide an electric working machine equipped with a brushless motor having excellent heat dissipation.
  • a stator having a stator core, a coil, and an insulator interposed between the stator core and the coil, which is held in a case, and a rotor arranged inside the stator and having a rotating shaft.
  • a brushless motor provided and an output unit driven by the rotating shaft are provided, and the stator includes a coil outside resin that is a resin that contacts the outside of the coil and at least one of the case and the stator core. It is characterized by having.
  • a plurality of the coils are provided, and the resin on the outside of the coils is arranged in series so as to commonly contact the outside of each of the plurality of the coils.
  • the case is made of a non-magnetic metal.
  • the invention according to claim 5 is characterized in that, in the above invention, the resin on the outside of the coil has fins.
  • the coil outer resin covers all exposed electric materials in the stator.
  • the case has a ventilation port.
  • the invention according to claim 8 is characterized in that, in the above-mentioned invention, the resin on the outside of the coil is a silicone resin.
  • the stator core has a plurality of teeth that respectively project inward, a plurality of the coils are provided, and the coils are wound around the teeth via the insulator.
  • the resin outside the coil does not cover the protruding end portion of each tooth.
  • the case has a case fin.
  • the case fin is provided on an outer peripheral surface of the case.
  • the case fin is tapered.
  • the invention according to claim 13 is characterized in that, in the above-mentioned invention, a plurality of the case fins are provided and are alternately arranged.
  • the case fin is oblique to the rotation shaft of the brushless motor.
  • the case fin is provided on a thrust surface of the case.
  • the invention according to claim 16 is characterized in that, in the above-mentioned invention, the case fins extend radially.
  • a plurality of the case fins are provided and concentrically project in a cylindrical shape.
  • the case fin extends in a spiral shape that gradually approaches the outer edge from the central portion.
  • the case fin is divided in the circumferential direction.
  • a stator which is held in a case and has a stator core, a coil, and an insulator interposed between the stator core and the coil, and a rotor which is arranged inside the stator and has a rotating shaft.
  • a brushless motor provided, an output unit driven by the rotating shaft, and a fan driven by the rotating shaft are provided, and the case has an outer wall and an inner wall, and the brushless motor is provided in the inner wall.
  • a motor and the fan are held, and the wind from the fan passes between the outer wall and the inner wall.
  • the case has a ventilation port.
  • the main effect of the present invention is to provide an electric working machine equipped with a brushless motor having excellent heat dissipation.
  • FIG. 1 It is a center longitudinal cross-sectional view of the lawnmower which concerns on the 1st form of this invention. It is a partially expanded view of FIG. It is a perspective view of the motor unit in the lawn mower of FIG. It is a disassembled perspective view of the motor unit of FIG. It is a longitudinal cross-sectional view of the motor unit of FIG. It is a cross-sectional view of the upper case portion in the motor unit of FIG. It is a cross-sectional view of the lower case portion in the motor unit of FIG. It is explanatory drawing of the steel plate and split mold of a stator core in the motor unit of FIG. It is a perspective view of the brushless motor in the motor unit of FIG. It is a top view of the stator in the motor unit of FIG.
  • FIG. 11 is a bottom view of the stator of FIG. 10.
  • FIG. 11 is a perspective view of a short-circuit member in the stator of FIG. 10 (only the first to third fittings are shown by solid lines).
  • FIG. 13 is a view similar to FIG. 12 in which the direction of the viewpoint is changed. It is a disassembled perspective view of the short circuit member of FIG. It is explanatory drawing of the winding method of the coil in the stator of FIG.
  • FIG. 13 is a top view showing a connection state of the first to third fittings in the short-circuit member of FIG. 12.
  • FIG. 17 is a wiring circuit diagram by the first to third fittings of FIG. 16. It is explanatory drawing corresponded to FIG.
  • FIG. 6 is a view corresponding to FIG. 5 of the lawn mower according to Embodiment 3-1 of the present invention, in which (A) the coil outside resin is not shown, and (B) the end surface of the coil outside resin is shown by hatching.
  • FIG. 6 is a view corresponding to FIG.
  • FIG. 5 of the lawnmower according to the third to second aspects of the present invention, in which (A) the coil outside resin is not shown, and (B) the end surface of the coil outside resin is shown by hatching.
  • FIG. 1 is a central longitudinal sectional view of a rechargeable lawnmower 1 which is an example of an electric working machine (gardening tool) according to a first embodiment of the present invention.
  • FIG. 2 is a partially enlarged view of FIG.
  • the lawn mower 1 includes a base 2 that extends in the front-rear direction and has an open lower surface, a main body 3 that is connected to the upper center of the base 2, and a frame-shaped handle 4 that extends rearward and obliquely upward from the rear portion. There is. The direction is based on the user holding the handle 4, the left side of FIG. 1 is in front of the lawn mower 1, and the upper side of FIG. 1 is on the lawn mower 1.
  • the base 2 has a pair of wheels 5 on the front and the rear, respectively, and can be moved back and forth by a handle 4.
  • a rear cover 6 and a grass basket 7 are provided below the handle 4 at the rear end of the base 2.
  • a switch lever 8 is provided at the rear end of the handle 4, and a lock-off button 9 that normally locks the operation of the switch lever 8 is provided in front of the switch lever 8. When the lock-off button 9 is pushed to unlock the switch lever 8, the switch lever 8 can be pulled.
  • the main body 3 has a main body housing 10 as an outer housing in which a cylindrical portion 11 at the lower end that opens downward is projected into the base 2.
  • a battery mounting portion 12 into which a battery pack 13 as a power source can be inserted and mounted from the upper rear side is formed so as to be lowered frontward.
  • the battery mounting portion 12 can be opened and closed by a battery cover 14.
  • a controller 15 having a control circuit board (not shown) is supported on the front of the main body housing 10 in a vertically standing state.
  • the control circuit board includes a microcomputer and a plurality (12) of switching elements.
  • a motor unit 16 is provided behind the controller 15 and below the battery mounting portion 12.
  • a rotary shaft 25 of the brushless motor 21 projects downward from the motor unit 16, and a spindle 17 is coaxially connected to the lower end of the rotary shaft 25.
  • the spindle 17 projects downward from the tubular portion 11 in the base 2, and a horizontal plate-shaped cutting blade 20 is attached to the lower end of the spindle 17 by an inner flange 18 and a bolt 19 in an orthogonal manner. Yes (output section).
  • the motor unit 16 has a brushless motor 21 and a motor case 22 that holds the brushless motor 21.
  • the brushless motor 21 is an inner rotor type that includes a cylindrical stator 23 and a rotor 24 that penetrates the inside of the stator 23 and has a rotating shaft 25 at its axis.
  • the motor case 22 has an upper case 26 and a lower case 27 that hold the stator 23 from above and below and rotatably support the rotating shaft 25.
  • the lower case 27 is attached to a base 28 provided on the upper side of the tubular portion 11.
  • a motor cover 29 that covers the motor unit 16 from above is provided on the upper side of the base 28.
  • a bearing retainer 30 that rotatably supports the spindle 17 via a bearing 31 is assembled by a plurality of screws 32 from below.
  • the lower end of the spindle 17 penetrating the bearing retainer 30 penetrates the baffle plate 33 screwed to the lower end of the tubular portion 11 and projects into the base 2.
  • the inner flange 18 on which the cutting blade 20 is mounted is provided with a cylindrical portion 34 into which the lower end of the spindle 17 is fitted.
  • a centrifugal fan 35 is provided on the outer circumference of the cylindrical portion 34.
  • An exhaust port (not shown) is arranged in a portion of the main body housing 10 radially outside the centrifugal fan 35.
  • the centrifugal fan 35 may be an axial fan or the like, or may be omitted.
  • the stator 23 of the brushless motor 21, which is also shown in FIG. 4 or FIG. 7, has a plurality of steel plates 40a (FIG. 8) stacked in the axial direction, and a stator core 40 having a plurality of (12) teeth 41 protruding inside.
  • An upper insulator 42 and a lower insulator 43 as resin-made electric insulating members integrally formed on both upper and lower ends of the stator core 40, and an inner peripheral surface of the stator core 40 and protruding end surfaces of each tooth 41 are integrally formed continuously with these. It includes a resin-made insulating portion 44 that covers the outer peripheral surface except for, and a coil 45 that is wound around each tooth 41 through the insulating portion 44.
  • a coil outside resin 36 is provided to commonly cover the outer peripheral surface of the coil 45 wound around each tooth 41.
  • the coil outside resin 36 is provided by integrally molding the coil outside resin 36 on the stator core 40 around which the coil 45 is wound (resin mold).
  • the coil outside resin 36 is a silicon resin (heat-conducting non-magnetic material) having good heat conductivity.
  • the coil outer side resin 36 does not cover the protruding end portion of each tooth 41, but spreads between each tooth 41.
  • the coil outside resin 36 may be a resin other than the silicone resin.
  • the coil outer side resin 36 may cover the protruding end portions of the teeth 41. Further, the coil outside resin 36 may be arranged in a state where a part of the coil 45 is exposed.
  • the upper insulator 42 is assembled with a short circuit member 46 that is electrically connected to a wire that forms the coil 45 to form a three-phase connection, and a sensor circuit board 47 that detects the rotational position of the rotor 24.
  • the ridges 48A, 48A have a tapered cross-sectional shape in which the width in the circumferential direction becomes smaller toward the radially outer side of the stator core 40.
  • the ridge 48B is not tapered and has a quadrangular cross-sectional shape whose circumferential width does not change along the radial direction.
  • a slight R (curved surface) that bulges outward along the circumferential direction is provided on the radially outer end surface of the protrusion 48B.
  • through holes 49 are formed in the protrusions 48A, 48A and 48B, respectively.
  • the protrusions 48A, 48A, 48B are formed by overlapping the protrusions 50A, 50A, 50B formed on each steel plate 40a.
  • Each of the protrusions 50A is formed in a taper shape in which the width in the circumferential direction becomes smaller toward the radially outer side of the stator core 40.
  • the protrusion 50B is not tapered and has a rectangular cross-sectional shape whose circumferential width does not change along the radial direction.
  • a slight R (curved surface) that bulges outward along the circumferential direction is provided on the radially outer end edge of the protrusion 50B.
  • a through hole 49 is formed in each of the protrusions 50A, 50A and 50B.
  • a notch 52 is formed between each of the protrusions 50A, 50A, 50B. Due to the notch 52, a groove 53 for positioning the stator 23 at the time of manufacturing is formed between the protrusions 48A, 48A, 48B.
  • each protrusion 48A has a tapered shape, interference with the mold is prevented when the upper insulator 42, the lower insulator 43, and the insulating portion 44 are integrally molded. That is, when the upper insulator 42, the lower insulator 43, and the insulating portion 44 are integrally molded with the stator core 40 by the left and right split molds 54 shown by the two-dot chain line in FIG.
  • the ridges 48A, 48A do not interfere with the split mold 54 that moves in the left-right direction in FIG. 8 due to the tapered surface.
  • the taper angle ⁇ with respect to this operation direction is 3° here.
  • the angle ⁇ is not limited to 3°, and may be set appropriately within the range of 1° to 10°.
  • the rotor 24 has a cylindrical rotor core 55 in which a plurality of steel plates 40a are laminated in the axial direction, and a rotating shaft 25 penetrating the axial center thereof.
  • the rotor core 55 and the rotary shaft 25 are integrally formed of resin 56.
  • a chamfer 57 (FIG. 4) is formed at the lower end of the rotary shaft 25.
  • a twill knurl 25a is formed in the resin 56 filling area as a rotary shaft stopper and a rotary shaft slip stopper, and minute irregularities are formed on the outer peripheral surface of the rotary shaft 25 in a grid pattern. It is formed into a shape.
  • a plurality of (eight) magnet holes 58 are concentrically formed through the periphery of the rotor core 55 in the axial direction, and a plate-shaped permanent magnet 59 is embedded in each magnet hole 58. Inside each of the permanent magnets 59, a space portion 60 as a meat steal is formed by stacking through holes formed in the steel plate 40a excluding the upper and lower ends, and the weight of the rotor 24 is reduced.
  • the upper case 26 and the lower case 27 of the motor case 22 have a circular cup shape that covers the upper and lower portions of the stator 23, respectively.
  • the upper case 26 is made of a non-magnetic metal such as an aluminum alloy, and as shown in FIGS. 3 to 5, a plurality of fins 65 for heat radiation in the vertical direction are provided in the circumferential direction from the outer circumference of the upper surface to the side surfaces. It is erected at a predetermined interval.
  • the upper case 26 is formed here by die casting (die casting), and each fin 65 has a taper shape in which the width increases (the thickness decreases) as it goes upward in order to facilitate the removal of the die. ..
  • the upper case 26 may be made of other material such as resin.
  • An upper bearing holding portion 66 is formed in the center of the upper surface of the upper case 26, and a bearing 68 is held via a resin insulating cap 67 to support the upper end of the rotary shaft 25.
  • a through hole 69 is formed at the center of the upper bearing holding portion 66 and is closed by a resin cap 70.
  • three screw boss portions 71A, 71A, 71B that bulge outward in the radial direction are formed at equal intervals in the circumferential direction in the vertical direction.
  • the screw boss portions 71A, 71A, 71B correspond to the protrusions 48A, 48A, 48B of the stator core 40, and the lower ends of the screw boss portions 71A, 71A, 71B are cross-sections that are fitted to the protrusions 48A, 48A, 48B in order.
  • the opening is tapered or rectangular in cross section.
  • a slit 72 is formed upward from the lower end between the protrusions 48A, 48A, 48B on the peripheral surface of the upper case 26.
  • the lower case 27 is similar to the upper case 26, and has a circular end surface portion 73 in which a lower bearing holding portion 74 is formed in the center, and a cylindrical portion 75 that rises upward from the outer periphery of the end surface portion 73. ..
  • a bearing 76 is held by the lower bearing holding portion 74 and supports the rotating shaft 25 penetrating the lower bearing holding portion 74.
  • the inner surface of the end surface portion 73 excluding the lower bearing holding portion 74 and the inner circumference of the tubular portion 75 and the outer circumference excluding each boss 77 are included. Is formed continuously. Boss portions 79A, 79A, 79B having the same shape as the corresponding screw boss portions 71A, 71A, 71B of the upper case 26 are formed in the resin layer 78 at positions corresponding to the protrusions 48A, 48A, 48B of the stator core 40 in the axial direction. Has been done.
  • boss portions 79A, 79A, 79B are provided with through holes that are tapered in the cross section or square in the cross section and are fitted into the ridges 48A, 48A, 48B, respectively. Further, concave grooves 80 are continuously formed below the bosses 79A, 79A, 79B.
  • the upper case 26 of the motor case 22 is covered with the screw boss portions 71A, 71A, 71B of the stator core 40 from above the stator 23 so as to fit the screw boss portions 71A, 71A, 71B, and is attached to the upper end of the rotary shaft 25 of the rotor 24.
  • the bearing 68 is held by the upper bearing holding portion 66.
  • the lower case 27 covers the protrusions 48A, 48A, 48B of the stator core 40 with the bosses 79A, 79A, 79B from below the stator 23, and the bearing 76 mounted on the lower end of the rotary shaft 25. It is held by the lower bearing holding portion 74.
  • screws 81 are inserted into the boss portions 79A, 79A, 79B of the lower case 27 from below, pass through the protrusions 48A, 48A, 48B, and reach the screw boss portions 71A, 71A, 71B of the upper case 26. Can be put in. Then, the brushless motor 21, that is, the motor unit 16 covered with the upper case 26 and the lower case 27 except for a part of the outer periphery of the stator core 40 is obtained.
  • the brushless motor 21 is provided with basic insulation by a basic insulating member (an upper insulator 42, a lower insulator 43 and an insulating portion 44 which are integrally molded) interposed between a stator core 40 which is an internal metal and a coil 45 which is a charging portion.
  • a resin 56 as a rotary shaft side insulating member interposed between the rotary shaft 25 and the rotor core 55, an insulating cap 67 interposed between the upper case 26 and the rotary shaft 25, and a cylinder of the lower case 27.
  • Additional insulation is provided by the resin layer 78 interposed between the shaped portion 75 and the stator core 40. Therefore, the stator core 40 and the rotating shaft 25 are doubly insulated. Further, since a vertical gap is formed between the upper case 26 and the lower case 27, the stator 23 can be assembled even if the axial dimension of the stator 23 changes.
  • the motor unit 16 is fixed to the base 28 by placing a screw in each boss 77 from below the base 28 in a state where the motor unit 16 is placed on the base 28 with the rotating shaft 25 facing downward.
  • the motor cover 29 covering the motor unit 16 covers the motor unit 16 in a state where the central portion including the upper bearing holding portion 66 of the upper case 26 is exposed.
  • the fins 65 of the upper case 26 are close to the inner surface of the motor cover 29.
  • the stator 23 of the brushless motor 21 includes a screw 81 penetrating the ridges 48A, 48A, 48B and screw boss portions 71A, 71A, 71B of the upper case 26 and the lower case 27 which are fitted to the ridges 48A, 48A, 48B.
  • the boss portions 79A, 79A, 79B prevent the motor case 22 from rotating.
  • the upper insulator 42 is a ring body integrally formed with the upper end surface of the stator core 40, and a plurality (12 pieces) of the short-circuit member 46 (12 pieces) provided on the upper surface thereof are provided on the upper surface thereof.
  • Terminal holding portions 85 for holding the fusing terminals 99 are provided at equal intervals in the circumferential direction.
  • Each terminal holding portion 85 is formed by vertically arranging an inner wall portion 86 on the inner peripheral side and an outer wall portion 87 on the outer peripheral side with a gap substantially corresponding to the diameter of the wire 115 in the radial direction.
  • a fitting groove 88 for fitting the fusing terminal 99 is formed in the center of the outer wall portion 87 and the outer wall portion 87 in the circumferential direction.
  • the lower insulator 43 is a ring body integrally formed with the lower end surface of the stator core 40, and the lower surface thereof is circumferentially displaced from the root of each tooth 41.
  • a plurality of (12) guide walls 90 extending in the direction are erected.
  • the short-circuit member 46 is a resin ring body that is slightly smaller than the upper insulator 42, and has a plurality of (five) rectangular tubular members that fit into the stopper bosses 89 of the upper insulator 42 from above on the outer periphery thereof.
  • the fitting boss 95 and a plurality of (three) ribs 96 that engage with the grooves 53 of the stator core 40 are provided in a protruding manner.
  • the short-circuit member 46 is formed in a step-like shape in which the axial thickness gradually decreases from the upper surface from the outer circumference to the inner circumference.
  • the third metal fitting 97V and the third metal fitting 97V are arranged concentrically and are insert-molded.
  • U, W, and V in a part of reference numerals mean that they are related to the U phase, W phase, and V phase of the corresponding three-phase currents, respectively.
  • the first to third metal fittings 97U to 97V are band plates having a “C” shape in a top view, and project outward in the radial direction at a plurality (4) of both end portions and point symmetrical positions of the both end portions.
  • a protruding piece 98 is formed.
  • a fusing terminal 99 is formed at the tip of each protruding piece 98. The fusing terminal 99 is once bent downward, folded back upward, and further bent outward.
  • a welding portion 101 for spot welding the power supply line 100U is formed at the base of the protruding piece 98 at one end of the first metal fitting 97U, and is opposite to the first metal fitting 97U of the second and third metal fittings 97W, 97U.
  • Welded portions 101 for spot welding the power supply wires 100W and 100V are also formed at the bases of the protruding pieces 98 at the end portions on the side.
  • the first to third metal fittings 97U to 97V are arranged in the short-circuit member 46 in the order of the first metal fitting 97U, the second metal fitting 97W, and the third metal fitting 97V from the top and with a phase shift of a predetermined angle in the circumferential direction.
  • the fusing terminals 99 project from the outer peripheral surface of the short-circuit member 46 in which the first to third metal fittings 97U to 97V are insert-molded, in a non-contact state with each other and at substantially equal intervals in the circumferential direction.
  • a plurality of (three places) through holes 102 are formed in the short-circuit member 46 in a state in which they are biased to a part in the circumferential direction at predetermined intervals.
  • each through hole 102 the corresponding welded portion 101 of the first to third metal fittings 97U to 97V is exposed.
  • a corresponding power supply line 100U to 100V is spot-welded to each welding portion 101.
  • a state in which a cutout 103 for pulling out the power supply lines 100U to 100V is connected between the welded portion 101 of the first metal fitting 97U and the welded portion 101 of the third metal fitting 97V, and only the lower side of the short-circuit member 46 is connected.
  • a plurality of (a pair of) supporting pieces 104 provided with mounting bosses 105 for mounting the sensor circuit board 47 are provided at the point symmetrical positions on the inner circumference of the short-circuit member 46 so as to protrude toward the center side.
  • a plurality of receiving pieces 106 (FIG. 13) supporting the outer circumference of the sensor circuit board 47 are provided between the support pieces 104 and on the inner circumference of the short-circuit member 46 so as to protrude toward the center.
  • the sensor circuit board 47 is a strip plate shape that circulates in an arc shape inside the short-circuit member 46, and fitting holes 107 into which the mounting bosses 105 of the respective support pieces are fitted are formed at both ends in the circumferential direction. ..
  • the sensor circuit board 47 is held on the inner peripheral side of the short-circuit member 46 by fitting the mounting boss 105 into each fitting hole 107 and supporting the outer circumference by the receiving piece 106.
  • a plurality of (three) rotation detecting elements 108 such as Hall elements that detect the magnetic field of the permanent magnet 59 of the rotor 24 are mounted on the back surface of the sensor circuit board 47.
  • a plurality of (five) signal lines 109 and power supply lines 100U to 100V connected to the sensor circuit board 47 are drawn out from the cutout 103 of the short-circuit member 46. This pulled-out position corresponds to the slit 72 provided in the upper case 26 of the motor case 22.
  • the short-circuit member 46 is attached to the stator 23 together with the sensor circuit board 47.
  • the five fitting bosses 95 on the outer circumference fit into the stopper bosses 89 on the upper surface of the upper insulator 42.
  • the screws 91 (FIG. 10) are inserted into the respective stop bosses 89 from above.
  • the tips of the three ribs 96 engage with the grooves 53 of the stator core 40.
  • each fusing terminal 99 is held by each terminal holding portion 85 of the upper insulator 42.
  • the rib 96 engages with and bites into the groove 53 at a plurality of (3) locations, and thus functions as an anchor that stably supports the short-circuit member 46.
  • the power supply lines 100U to 100V and the signal line 109 are drawn out from the slit 72 of the upper case 26 through the packing 82 (FIG. 3) on the sleeve attached to the slit 72.
  • Each coil 45 is wound using three winding nozzles as shown in FIG. That is, starting from the three teeth 41 located at 120° intervals, the wires 115A, 115B, 115C fed from the corresponding winding nozzles start to be wound at the same time, and then directly to the four teeth 41 adjacent to the stator 23 in the circumferential direction. Each of them is wound in order to form a total of 12 coils 45.
  • the wire 115A after the starting end 116A is locked to the fusing terminal 99 corresponding to the first tooth 41, the coil 45 is sequentially formed on the tooth 41 adjacent in the clockwise direction.
  • the winding direction at this time is a counterclockwise direction toward the tooth 41.
  • each coil 45 is returned to the upper insulator 42 (connection side) and locked to the fusing terminal 99 between the pair of adjacent teeth 41.
  • the wire 115A is once pulled out to the side of the lower insulator 43 (the side opposite to the wire connection side), and at the base of the wound tooth 41.
  • the starting end 116B of another adjacent wire 115B is locked to the fusing terminal 99 to be locked, and the locking portion ends. 118A.
  • the direction of the terminal end 118A is aligned with the direction of the starting end 116B of another adjacent wire 115B, and can be simultaneously cut in the circled portion of FIG.
  • the wires 115B and 115C are wound in the same manner as the wire 115A except for the arrangement.
  • the orientation of the terminal end 118B of the wire 115B is aligned with the orientation of the starting end 116C of the wire 115C, and the orientation of the terminal end 118C of the wire 115C is aligned with the orientation of the starting end 116A of the wire 115A.
  • the first to third metal fittings 97U to 97V of the short-circuit member 46 are arranged in a state in which the coils 45 are out of phase with each other in the circumferential direction, and as shown in FIG.
  • the predetermined crossovers 117A to 117C are each fusing with three coils 45 interposed therebetween.
  • the first metal fitting 97U is hatched and the second metal fitting 97W is shaded in order to easily distinguish the crossovers 117A to 117C to which the first to third metal fittings 97U to 97V are fused.
  • 3rd metal fitting 97V is dotted.
  • the three coils 45 that are continuously adjacent to each other in the circumferential direction are delta as U (WU), V (UV), and W (UW) by the first to third metal fittings 97U to 97V of each phase. Wired. Then, since these are arranged in parallel in the order of 4 sets by the first to third metal fittings 97U to 97V, the three-phase circuit here is as shown in FIG.
  • This three-phase circuit is equivalent to a delta connection in which four coils U1 to U4, V1 to V4, and W1 to W4 of U, V, and W phases are connected in parallel.
  • the lawnmower 1 performs an operation of mowing lawn by the cutting blade 20 that is rotated horizontally (parallel to the ground) around the vertical axis (rotary blade type).
  • the operator pushes the base 2 forward through the handle 4 to cause the lawnmower 1 to travel on the lawn-grown ground through the wheels 5 and trims the lawn to prepare the lawn surface.
  • the mowed grass is collected in the grass collection basket 7.
  • the stator 23 is prevented from rotating with respect to the motor case 22 assembled to the base 28 by the screw 81 penetrating the protrusions 48A, 48A, 48B serving as a rotation preventing portion, and therefore, it depends on the tolerance. The influence is small, and the rotation can be stopped with high accuracy. Further, when fixing the brushless motor 21, high strength can be obtained. In particular, since the screw 81 directly penetrates the stator core 40, bending is less likely to occur as compared with the structure in which the upper case 26 and the lower case 27 are connected to each other outside the stator core 40 by a screw.
  • the wires 115A to 115C forming the coil 45 do not intersect with each other, abrasion due to contact is less likely to occur and durability is improved.
  • the twill knurls 25a are provided on the outer periphery of the rotating shaft 25, the biting of the resin 56 is improved, the slip torque in the rotation direction and the axial direction is increased, and the rotation of the cutting blade 20 causes a load. Even if the value becomes large, the integrity of the rotary shaft 25 and the rotor core 55 is maintained.
  • the rotation of the rotating shaft 25 causes the centrifugal fan 35 to rotate and push out the surrounding air radially outward, so that the centrifugal force is passed from the outside of the main body 3 through the gap, the gap of the motor cover 29, and the outside of the motor unit 16 to the centrifugal force.
  • a flow of air (wind) reaching the fan 35 and the exhaust port of the main body housing 10 radially outside thereof is formed. The wind cools the internal mechanism of the lawnmower 1.
  • the stator core 40 of the brushless motor 21 since the coil outer resin 36 covering the coils 45 wound around the teeth 41 is provided, it is generated by the operation of the brushless motor 21 including energization of the coils 45. The heat is transferred to the coil outside resin 36. The heat received by the coil outer side resin 36 is transmitted to the metal motor case 22 through the stator core 40 that is in direct contact therewith, and is dissipated from the fins 65 and the like of the motor case 22. The heat generated by the brushless motor 21 has a larger amount of heat transferred to the motor case 22 and is dissipated more efficiently than when the coil outer resin 36 is not provided. As shown in FIG. 23(A), the wind W from above hits the tapered slopes of the fins 65, so that the motor case 22 and thus the brushless motor 21 are efficiently cooled.
  • the lawn mower 1 is held by the motor case 22, and is provided with a stator core 40, a coil 45, and a stator 23 having an insulating portion 44 interposed between the stator core 40 and the coil 45, and is arranged inside the stator 23.
  • a brushless motor 21 having a rotor 24 having 25 and a spindle 17 driven by a rotating shaft 25 are provided.
  • the stator 23 has a coil outside resin 36 that is a resin that contacts the outside of each coil 45 and the stator core 40. Have.
  • the brushless motor 21 is efficiently radiated by the coil outside resin 36, the stator core 40, and the motor case 22, and the lawnmower 1 including the brushless motor 21 having excellent heat radiation is provided.
  • a plurality of coils 45 are provided, and the coil outside resin 36 is arranged in series so as to commonly contact the outside of each of the plurality of coils 45. Therefore, the coil outer side resin 36 is easier to form.
  • the motor case 22 is made of non-magnetic metal. Therefore, the coil outside resin 36 is thermally coupled to the non-magnetic metal having excellent thermal conductivity via the stator core 40, and the heat dissipation is further enhanced.
  • the fins 65 may be prepared separately from the motor case 22 and fixed to the motor case 22. Fins for heat dissipation may be provided on the stator core 40. In this case, the motor case 22 or the fin 65 thereof may be omitted.
  • the motor case 22 may not be divided into upper and lower parts, may be divided into three or more parts, or may be omitted.
  • the teeth 41 and the coils 45 may be 11 or less or 13 or more.
  • the circuit of the coil 45 may be a delta connection of 3 parallels or less or 5 parallels or more for each phase, a delta connection including series connection, or a star connection.
  • At least one of the following items may be performed together with the formation of the fins 65 or in place of the formation of the fins 65.
  • At least one of the upper insulator 42, the lower insulator 43, and the insulating portion 44 has a higher thermal conductivity (for example, 4. W/m ⁇ K (watt/meter/kelvin)) than that of a normal resin. It may be formed of a high thermal conductive resin having 7, 13 or 24 W/m ⁇ K).
  • At least one of the coil 45 and the stator core 40 or the motor case 22 and the stator core 40 and the motor case 22 is coated with a highly heat-conductive adhesive or a fluid silicone resin, or a high-heat conductive sheet is interposed. You may be dressed. Fins may be provided on at least one of the inner wall of the motor case 22 and the portion of the main body housing 10 adjacent to the motor case 22.
  • a power cord is provided in place of the battery mounting portion 12 to drive a commercial power source, the number of various screws and screw holes is increased or decreased, various engaging portions, connecting portions, screw fastening portions, holding portions, And/or at least one of the mounting portions is changed to another structure or type, at least one of the microcomputer and the switching element is mounted on the sensor circuit board 47, and at least one of various cases and housings is made of material. At least one of various members, number of parts, presence/absence of installation, material, arrangement, structure, type, etc., such as resin, metal such as aluminum (including aluminum alloy), and composites thereof, etc. May be changed as appropriate.
  • the present invention can be applied to other types of lawn mowers such as a reel blade type which is a cylindrical reel blade in which the cutting blade 20 rotates around the left-right direction as an axial direction, and thus to other electric working machines. May be applied.
  • the present invention is applied to high-power products, such as angle drills, hammers, hammer drills, marunoco, reciprocating saws or grinders in power tools, or chainsaws in gardening tools, hedge trimmers, blowers, mowers or hedge clippers,
  • it is applied to an air compressor for air tools that uses air as a power source.
  • An electric work machine such as an air compressor for an air tool, for operating a work machine that performs work is included in the electric work machine.
  • the above-described effects of the present invention are particularly remarkable in a relatively large brushless motor (the outer diameter (diameter) of the stator core 120 is, for example, 80 mm or more).
  • the second form of the present invention is the same as the first form except for the form of the resin outside the coil.
  • Such a second form includes a 2-1 form to a 2-3 form depending on the form of the resin on the outside of the coil.
  • Members and portions similar to those in the first embodiment are designated by the same reference numerals, and description thereof will be appropriately omitted.
  • FIG. 18 is an explanatory diagram corresponding to FIG. 6 of the lawnmower according to the 2-1st mode of the present invention.
  • the coil outer resin 236A of the stator 223A in the brushless motor 221A of the lawn mower is arranged at 12 positions so that the coil outside resin 236A individually contacts the outside of each of the 12 coils 45.
  • a tubular base part for connecting the parts covers the inner surface of the stator core 40.
  • Grooves P extending in the radial direction are formed in portions of the coil outside resin 236A between the adjacent coils 45, respectively.
  • the lawn mower according to the 2-1st mode is held inside the motor case 22, has a stator core 40, a coil 45, and a stator 223A having an insulating portion 44 interposed between the stator core 40 and the coil 45, and the inside of the stator 223A.
  • a spindle 17 that is driven by the rotating shaft 25, and the stator 223A is a resin that contacts the outside of each coil 45 and the stator core 40. 236A of each coil outer side resin. Therefore, the brushless motor 221A is efficiently radiated by the coil outside resin 236A, the stator core 40 and the motor case 22, and a lawn mower provided with the brushless motor 221A having excellent heat radiation is provided.
  • each coil outside resin 236A has a groove P formed between twelve coils 45. Therefore, the heat transfer in each coil 45 is directed to the stator core 40 or the motor case 22 by each coil outer side resin 236A, and the heat transfer property is enhanced.
  • FIG. 19 is an explanatory diagram corresponding to FIG. 6 of the lawnmower according to the second to second aspects of the present invention.
  • the coil outside resin 236B of the stator 223B in the brushless motor 221B of the lawn mower is arranged in series so as to commonly contact the outside of each of the plurality of coils 45, and at the upper and lower portions of each coil 45, It has a fin 237 that projects upward or downward in the shape of a plate that extends in the radial direction.
  • the lawn mower according to the second to second aspects includes a stator 223B that is held by the motor case 22, has a stator core 40, a coil 45, and an insulating portion 44 that is interposed between the stator core 40 and the coil 45, and the inside of the stator 223B.
  • a spindle 17 driven by the rotation shaft 25, and the stator 223B is made of resin that contacts the outside of the coil 45 and the stator core 40. It has a certain coil outside resin 236B. Therefore, the brushless motor 221B is efficiently radiated by the coil outer side resin 236B, the stator core 40 and the motor case 22, and the lawn mower provided with the brushless motor 221B having excellent heat radiation is provided.
  • the coil outer side resin 236B has each fin 237. Therefore, the surface area of the coil outer side resin 236B is efficiently increased, and the heat dissipation of the brushless motor 221B is further improved.
  • FIG. 20 is an explanatory diagram corresponding to FIG. 6 of the lawnmower according to the second to third aspects of the present invention.
  • the coil outer side resin 236C of the stator 223C in the brushless motor 221C of the lawn mower is arranged at 12 positions so that the coil outside resin 236C individually contacts the outside of each of the 12 coils 45, and their roots (radial outside). And a tubular base part for connecting the parts). Grooves P extending in the radial direction are formed in portions of the coil outside resin 236C between the adjacent coils 45, respectively. Further, fins 237 projecting in a plate shape extending in the radial direction upward or downward are formed at the portions above and below the coil 45 in each coil outside resin 236C.
  • the lawn mower according to the second to third aspects is a stator 223C that is held by the motor case 22, has a stator core 40, a coil 45, and an insulating portion 44 that is interposed between the stator core 40 and the coil 45, and the inside of the stator 223C. And a spindle 17 driven by the rotating shaft 25.
  • the stator 223C is made of resin that contacts the outside of the coil 45 and the stator core 40. There is a certain coil outside resin 236C. Therefore, the brushless motor 221C is efficiently radiated by the coil outer side resin 236C, the stator core 40 and the motor case 22, and a lawn mower provided with the brushless motor 221C having excellent heat radiation is provided.
  • each coil outside resin 236C has a groove P formed between twelve coils 45. Therefore, the heat transfer in each coil 45 is directed to the stator core 40 or the motor case 22 by each coil outer resin 236C, and the heat transfer property is enhanced. Further, each coil outside resin 236C has a fin 237. Therefore, the surface area of the coil outside resin 236C is efficiently increased, and the heat dissipation of the brushless motor 221C is further improved.
  • the said 2nd form has the same modification as the 1st form suitably.
  • at least a part of the base portion connecting the roots of the coil outer side resins 236A and 236C may be omitted.
  • the coil outside resins 236A and 236C are arranged at 12 positions so as to individually contact the outside of each of the 12 coils 45.
  • each coil outer side resin 236A, 236C (individual part) may straddle a plurality of coils.
  • the base portion of each coil outer side resin 236A, 236C may not cover the inner surface of the stator core 40.
  • the fin 237 may be formed only on one surface side of the coil outer side resin 236B, 236C, or may be arranged so as to be displaced from the coil 45.
  • the fin 237 may be a metal plate and may be coupled to the coil outside resins 236B and 236C.
  • a metal disk contacting one surface of the coil outer side resin 236B, 236C may be coupled to at least one of the stator core 40 and the motor case 22.
  • the third mode of the present invention is the same as the first mode except for the resin outside the coil and the motor case.
  • Such a third form includes a 3-1 form and a 3-2 form depending on the form of the motor case.
  • Members and portions similar to those in the first embodiment are designated by the same reference numerals, and description thereof will be appropriately omitted.
  • FIG. 21(A) is a view corresponding to FIG. 5 of the lawn mower according to Embodiment 3-1 of the present invention, in which the resin outside the coil is not shown.
  • FIG. 21(B) is a view corresponding to FIG. 5 of the lawn mower according to Embodiment 3-1 of the present invention, in which the end surface of the resin outside the coil is hatched.
  • the coil outside resin 336A of the stator 323A in the brushless motor 321A of the motor unit 316A of the lawn mower is cylindrical and is arranged in series so as to commonly contact the outside of each of the plurality of coils 45.
  • the coil outside resin 336A is in contact with the inner surface of the peripheral wall of the upper case 326A and the inner wall of the lower case 327A.
  • the coil outer resin 336A is integrally molded with the stator 223A after the stator 223A is assembled and before the rotor 24 is assembled when the motor unit 316A is assembled.
  • the coil outside resin 336A is used for all the electric materials (electrically exposed ones, here, each coil 45, the wire portion wound around the guide wall 90, the crossovers 117A to 117C and the sensor circuit board 47, and all the electric materials in the stator 323A.
  • a ring-shaped high thermal conductor 338 is arranged between the upper case 326A and the lower case 327A of the motor case 322A and on the radially outer side of the stator core 40.
  • the high thermal conductor 338 is made of silicon resin here, and has high thermal conductivity as a resin.
  • the high thermal conductor 338 is in contact with the stator core 40 and the upper case 326A and the lower case 327A, has an outer surface continuous with the outer surface of the upper case 326A and the outer surface of the lower case 327A, and has a lower surface than the upper case 326A in the motor case 322A. It is designed to fill the step of the case 327A.
  • a lawn mower is a stator 323A held by a motor case 322A, having a stator core 40, a coil 45, and an insulating portion 44 interposed between the stator core 40 and the coil 45, and the inside of the stator 323A. And a spindle 17 that is driven by the rotating shaft 25.
  • the stator 323A includes the stator 323A outside the coil 45 and the stator core 40 and the motor case 322A.
  • the coil outer resin 336A which is a resin that contacts the upper and lower inner surfaces (from the lower surface of the upper wall of the upper case 326A to the upper surface of the lower wall of the lower case 327A).
  • the brushless motor 321A is efficiently dissipated by the coil outer resin 336A that is in contact with the stator core 40 and the motor case 322A, and a lawnmower equipped with the brushless motor 321A having excellent heat dissipation is provided. Further, since all the electric material in the stator 323A is covered with the coil outer side resin 336A, the brushless motor 321A has waterproofness and dustproofness. Further, the high thermal conductor 338 is arranged on the step (between the upper case 326A and the lower case 327A) of the motor case 322A.
  • the wind easily contacts the high thermal conductor 338, and the heat dissipation efficiency is further improved. Further, the high thermal conductor 338 is in contact with the stator core 40. Therefore, the heat dissipation efficiency of the stator core 40 is further improved.
  • FIG. 22(A) is a view corresponding to FIG. 5 of the lawn mower according to Embodiment 3-2 of the present invention, in which the resin outside the coil is not shown.
  • FIG. 22(B) is a view corresponding to FIG. 5 of the lawnmower according to Embodiment 3-2 of the present invention, in which the end surface of the resin outside the coil is hatched.
  • the coil outside resin 336B of the stator 323B in the brushless motor 321B of the motor unit 316B of the lawn mower is cylindrical and is arranged in series so as to commonly contact the outside of each of the plurality of coils 45.
  • the coil outside resin 336B is formed in a state having a gap between itself and the inner surface of the motor case 322B.
  • the coil outer resin 336B is in contact with the inner surface of the peripheral wall of the upper case 326B and the inner wall of the lower case 327B.
  • the coil outside resin 336B is integrally molded with the stator 223B after the stator 223B is assembled and before the rotor 24 is assembled when the motor unit 316B is assembled.
  • the coil outside resin 336B is used for all the electric materials in the stator 323B (electrically exposed ones, here, each coil 45, the wire portion wound around the guide wall 90, the crossovers 117A to 117C and the sensor circuit board 47, and Cover the fusing terminal 99 and the weld 101).
  • the high thermal conductor 338 described above is arranged in a portion of the motor case 322B between the upper case 326B and the lower case 327B and on the radially outer side of the stator core 40.
  • a ventilation port 339a is opened on the upper wall of the upper case 326B
  • a ventilation port 339b is opened on the lower wall of the lower case 327B.
  • the wind generated by the centrifugal fan 35 enters the motor case 322B from the ventilation port 339a, passes through the upper gap, the coil outer resin 336B and the rotor 24, and the lower gap, and then from the ventilation port 339b. It is discharged to the outside of the motor case 322B.
  • a lawn mower according to a 3-2nd mode is held in a motor case 322B, has a stator core 40, a coil 45, and a stator 323B having an insulating portion 44 interposed between the stator core 40 and the coil 45, and the inside of the stator 323B. And a spindle 17 that is driven by the rotation shaft 25.
  • the stator 323B is provided outside the coil 45, and the stator core 40 and the motor case 322B.
  • Has a coil outer side resin 336B which is a resin contacting the upper and lower inner surfaces (from the peripheral surface of the upper case 326B to the peripheral surface of the lower case 327B).
  • the brushless motor 321B is efficiently dissipated by the coil outer resin 336B that is in contact with the stator core 40 and the motor case 322B, and a lawnmower including the brushless motor 321B having excellent heat dissipation is provided. Furthermore, since all the electric materials in the stator 323B are covered with the coil outer resin 336B, the brushless motor 321B has waterproofness and dustproofness. Furthermore, the motor case 322B has ventilation ports 339a and 339b. Therefore, the coil 45, the stator core 40, and the like are cooled from the inside as well, and the heat dissipation is further improved.
  • the said 3rd form has the modification similar to a 1st form and a 2nd form suitably.
  • the coil outer side resins 336A and 336B may be provided for each coil 45 as in the case of the 2-1 and 2-3 forms, and in this case, there is a gap between the coil outer side resins 336A and 336B. This makes it easier for the wind to pass through in the motor case 322B, increasing the surface area of the coil outer side resins 336A, 336B and increasing the portion of the coil outer side resins 336A, 336B in contact with the wind.
  • the coil outer side resin 336B may have fins 237 projecting into the gap with the motor case 322B, as in the second, second and third forms.
  • the high thermal conductor 338 may be omitted.
  • the fourth mode of the present invention is the same as the first mode except for the side view of the fins of the motor case.
  • the fourth mode includes the 4-1th mode to the 4-4th mode depending on the side view of the fin.
  • Members and portions similar to those in the first embodiment are designated by the same reference numerals, and description thereof will be appropriately omitted.
  • FIG. 23(B) is an explanatory view (partially developed view) of the side view shape of the fin 465A in the motor case 422A of the lawn mower according to Embodiment 4-1 of the present invention.
  • each fin 465A of the 4-1st embodiment stands up from the outer peripheral surface of the motor case 422A and has a tapered shape that spreads downward in a side view. It has become.
  • the fins 465A have a length in the up-down direction of about half that of the fins 65 and are alternately arranged in the up-down direction.
  • the fins 465A increase the surface area of the motor case 422A, and the wind passing between the fins 465A arranged in the circumferential direction on the upper side of the motor case 422A is circumferentially arranged on the lower side of the motor case 422A. Efficient heat dissipation is realized by hitting the fins 465A arranged in line.
  • FIG. 23C is an explanatory view (partially developed view) of the side view shape of the fin 465B in the motor case 422B of the lawnmower according to the 4-2nd embodiment of the present invention.
  • Each fin 465B of the 4-2nd form stands up from the outer peripheral surface of the motor case 422B, and has a linear shape with a constant width over the entire side view.
  • the fins 465B increase the surface area of the motor case 422B and allow air to pass therethrough, thereby achieving efficient heat dissipation.
  • FIG. 23D is an explanatory view (partially developed view) of the side view shape of the fin 465C in the motor case 422C of the lawnmower according to the fourth to third aspects of the present invention.
  • Each of the fins 465C according to the fourth to third forms is erected from the outer peripheral surface of the motor case 422C, and has a linear shape with a constant width over the entire side view.
  • the fins 465C have a vertical length of about half that of the fins 465B, and the fins 465C are alternately arranged vertically.
  • the fins 465C increase the surface area of the motor case 422C, and the wind passing between the fins 465C arranged in the circumferential direction on the upper side of the motor case 422C is circumferentially arranged on the lower side of the motor case 422A. Efficient heat dissipation is realized by hitting the fins 465A arranged in line.
  • FIG. 23(E) is an explanatory view (partially developed view) of the side view shape of the fin 465D in the motor case 422D of the lawnmower according to the fourth to fourth aspects of the present invention.
  • Each of the fins 465D of the fourth to fourth forms is erected from the outer peripheral surface of the motor case 422D, has a constant width over the entire side view, and is viewed from the side in the direction of the rotary shaft 25 (vertical direction). It is a straight line that slopes upward to the right so that it has an angle.
  • each fin 465D in a side view is on the left side of the lower left end of the right adjacent fin 465D, and the adjacent fins 465D do not overlap each other in the vertical direction. Therefore, the motor case 422D with the fins 465D can be formed by die casting.
  • the fins 465D increase the surface area of the motor case 422D, and the fins 465D can catch the wind W from above at an angle, and the wind W efficiently hits the fins 465D. Efficient heat dissipation is realized.
  • the above-described fourth mode appropriately has the same modification examples as the first to third modes.
  • the fourth mode may be combined with the second mode or the third mode.
  • fins having a constant width and tapered fins may be used together, or the fins may be arranged in three or more rows in the vertical direction. The lengths of the fins may be different from each other, and the total number of times the wind hits the fins may be increased to improve the heat dissipation efficiency.
  • the fins 465D in the fourth to fourth aspects may be formed so as to partially overlap each other in the vertical direction by a three-dimensional printer or the like.
  • the fifth mode of the present invention is the same as the first mode except for the top view of the fins of the motor case.
  • Such a fifth form includes a 5-1st form to a 5-9th form, depending on the form of the fin viewed from above.
  • Members and portions similar to those in the first embodiment are designated by the same reference numerals, and description thereof will be appropriately omitted.
  • FIG. 24(B) is an explanatory view of the top view shape of the fin 565A in the motor case 522A of the lawn mower according to Embodiment 5-1 of the present invention.
  • the fins 65 radially extending in the radial direction of the first embodiment stand up from the outer edge upward on the upper surface (thrust surface) of the motor case 22.
  • Each fin 565A of the 5-1st form in FIG. 24B stands up in a state of extending from the center of the upper surface of the motor case 522A to the peripheral edge.
  • the upper surface of the motor case 522A of the 5-1st form is formed flat.
  • Such fins 565A increase the surface area of the motor case 522A and allow air to pass around the fins 565A on the upper surface of the motor case 522A, thereby achieving efficient heat dissipation.
  • FIG. 24C is an explanatory diagram of the top view shape of the fin group 565B in the motor case 522B of the lawn mower according to Embodiment 5-2 of the present invention.
  • the fin group 565B according to the 5-2nd embodiment has a plurality of fins 565B1 standing upright in a state extending from the center of the upper surface of the motor case 522B to the peripheral edge, and a state in which the fin group 565B extends from the central portion to the peripheral edge between them.
  • the upper surface of the motor case 522B in the 5-2nd form is formed flat. With such a fin group 565B, the surface area of the motor case 522B is increased, and the total number of times that the fin group 565B on the upper surface of the motor case 522B is blown is increased, so that efficient heat dissipation is realized.
  • FIG. 24D is an explanatory diagram of a top view shape of the fin group 565C in the motor case 522C of the lawn mower according to the fifth to third aspects of the present invention.
  • the fin group 565C of the fifth to third forms is a state in which a plurality of fins 565C1 are erected upward in a state of extending from the central portion of the upper surface of the motor case 522C to the peripheral edge and a state of extending from the central portion to the peripheral edge between them.
  • a plurality of fins 565C3 standing between the fins 565C1 and 565C2 and extending radially in the outer edge of the upper surface of the motor case 522C and standing above the fins 565C3.
  • An upper bearing holding portion 66 that protrudes upward or is flat is arranged inside the fins 565C1 in the radial direction.
  • Such a fin group 565C increases the surface area of the motor case 522C, and increases the total number of times that the fin group 565C on the upper surface of the motor case 522C is blown by air, thereby realizing efficient heat dissipation.
  • FIG. 25(A) is an explanatory diagram of a top view shape of the fin group 565D in the motor case 522D of the lawn mower according to Embodiment 5-4 of the present invention.
  • the fin group 565D according to the fifth to third aspects includes a fin 565D1 that is erected upward in a cylindrical shape in the center portion, a fin 565D2 that is concentrically protruded in a cylindrical shape on the outer side in the radial direction, and so on. Inside the fin 565D1, an upper bearing holding portion 66 that protrudes upward or is flat is arranged. Due to the fin group 565D, the surface area of the motor case 522D is increased, and the fin group 565D on the upper surface of the motor case 522D is exposed to the wind to realize efficient heat dissipation.
  • FIG. 25B is an explanatory diagram of a top view shape of the fin group 565E in the motor case 522E of the lawn mower according to the fifth to fifth aspects of the present invention.
  • the fin group 565E of the fifth to fifth forms includes a set of fins 565E1 that is erected upward in a state where a cylinder is divided in the circumferential direction in the central portion, and a set of fins that also concentrically protrude on the radially outer side. It has fins 565E2,.... Inside the fin 565E1, an upper bearing holding portion 66 that projects upward or is flat is arranged.
  • the surface area of the motor case 522E is increased, and the total number of times that the fin group 565E on the upper surface of the motor case 522E is hit by the wind is increased, and efficient heat dissipation is realized.
  • FIG. 25C is an explanatory diagram of the top view shape of the fin 565F in the motor case 522F of the lawn mower according to the fifth to sixth aspects of the present invention.
  • the fin 565F of the fifth-third form has a spiral shape in which the fin gradually approaches the outer edge from the center in a top view.
  • an upper bearing holding portion 66 that projects upward or is flat is arranged inside the fin 565F.
  • the fins 565F increase the surface area of the motor case 522F, and at the same time, the fins 565F on the upper surface of the motor case 522F are blown by the wind to realize efficient heat dissipation.
  • FIG. 25D is an explanatory diagram of a top view shape of the fin group 565G in the motor case 522G of the lawn mower according to the fifth to seventh aspects of the present invention.
  • the fin group 565G of the fifth-third aspect includes fins 565G1, 565G2... Arranged on a spiral imaginary line that gradually approaches the outer edge from the center in a top view. Inside the fins 565G1, 565G2,... On the center side, an upper bearing holding portion 66 that is protruded upward or flat is arranged.
  • Such a fin group 565G increases the surface area of the motor case 522G, and increases the total number of times that the fin group 565G on the upper surface of the motor case 522G is blown with air, thereby realizing efficient heat dissipation.
  • FIG. 25(E) is an explanatory diagram of the top view shape of the fin 565H in the motor case 522H of the lawnmower according to the fifth to eighth aspects of the present invention.
  • Each of the fins 565H in the fifth to eighth modes extends in an arc shape from the center to the outer edge in a top view, and is arranged in a windmill shape as a whole.
  • the upper surface of the motor case 522H of the fifth to eighth modes is formed flat.
  • the fins 565H increase the surface area of the motor case 522H, and at the same time, the fins 565H on the upper surface of the motor case 522H are exposed to the wind to realize efficient heat dissipation.
  • FIG. 25F is an explanatory diagram of the top view shape of the fin 565I in the motor case 522I of the lawnmower according to the fifth to ninth aspects of the present invention.
  • Each of the fins 565I of the fifth to eighth modes extends in an arc shape from the central portion to the outer edge in a top view, and is arranged in a windmill shape in which the centers are not connected as a whole.
  • An upper bearing holding portion 66 that protrudes upward or is flat is arranged radially inward of each fin 565I.
  • Such fins 565I increase the surface area of the motor case 522I, and the fins 565I on the upper surface of the motor case 522I are exposed to the wind to realize efficient heat dissipation.
  • the said 5th form has the example of a change similar to the 1st form thru
  • the fifth form may be combined with the second to fourth forms.
  • the fins (groups) 565A to 565I on the thrust surface may be formed in a tapered shape that becomes thicker toward the outer edge. At least one of the number of installed fins (groups) 565A to 565I, the arrangement, and the size thereof can be appropriately changed.
  • the center side of the fin group 565D in the 5-4th form is arranged radially inward of the fin group 565C in the 5-3th form, or only the outer peripheral side of the fin group 565D in the 5-4th form is arranged in the 5-5th form.
  • Various forms may be combined, such as being divided like forms. Fins (groups) 565A to 565I may be provided on the lower surface instead of or together with the upper surfaces of the motor cases 522A to 522I.
  • the fin 65 of the first mode is a series having the side view shape of FIG. 23(A) and the top view shape of FIG. 24(A)
  • any one of the side view shapes of the fourth mode A series of fins having any of the top view shapes of the fifth aspect may be provided.
  • FIG. 26 is a vertical cross-sectional explanatory view of the motor unit 616 of the lawnmower according to the sixth embodiment of the present invention.
  • the motor case 622 of the motor unit 616 has a cup-like shape having a bottom on the upper side and an upper case 626 having a flange 626a on the outer side of the upper end, and a bottomed double-cylinder shape having an outer cylinder 627a.
  • a lower case 627 having an inner flange 627b protruding radially inward in the upper opening.
  • the upper case 626 and the lower case 627 are fitted on the upper side of the inner flange 627b with the flange 626a mounted thereon via an O-ring 628a (elastic member) made of an elastic body (rubber) as a waterproof member.
  • the upper case 626 enters the outer cylindrical portion 627a of the lower case 627 and faces the inner cylindrical portion 627c of the lower case 627.
  • the stator core 40 of the stator 623 including the stator core 40, the upper insulator 42, the lower insulator 43, the insulating portion 44, and the coil 45 is sandwiched between the lower portion of the upper case 626 and the upper portion of the inner cylindrical portion 627c of the lower case 627. ..
  • the stator 623 does not include the coil outer resin 36.
  • a bearing 68 of the rotary shaft 25 of the rotor 24 is held in the center of the upper wall of the upper case 626 via an O-ring 628b, and is rotated in the center of the lower wall of the lower case 627 via an O-ring 628c.
  • the bearing 76 of the shaft 25 is held.
  • a centrifugal fan 635 is fixed to a portion of the rotary shaft 25 between the bearing 76 and the rotor core 55.
  • the centrifugal fan 635 is arranged inside the inner cylindrical portion 627c of the lower case 627, and is arranged below the coil 45 and the stator core 40.
  • a through hole 627d is formed in a portion of the inner cylindrical portion 627c that is radially outward of the centrifugal fan 635, as a plurality of ventilation holes that connect the inner side and the outer side of the inner cylindrical portion 627c.
  • through holes 626b serving as a plurality of ventilation holes are similarly formed in a portion of the upper case 626 below the flange 626a. Then, by these through holes 627d, 626b, and between the inner cylinder portion 627c and the outer cylinder portion 627a, between the stator core 40 and the outer cylinder portion 627a, and between the upper case 626 and the outer cylinder portion 627a, The air passage W1 is formed.
  • the inner tubular portion 627c and the upper case 626 serve as an inner wall of the motor case 622, and the outer tubular portion 627a serves as an outer wall of the motor case 622.
  • Such a sixth type lawnmower is held in the motor case 622 and has a stator core 40, a coil 45, a stator 623 having an insulating portion 44 interposed between the stator core 40 and the coil 45, and the inside of the stator 623.
  • the wind W3 from the centrifugal fan 635 passes between the outer wall and the inner wall of the motor case 622. Therefore, the winds W2 to W5 circulate in the motor case 622, the brushless motor 621 is efficiently radiated by the winds W2 to W5, and the lawn mower provided with the brushless motor 21 having excellent heat dissipation is provided.
  • the motor case 622 has through holes 627d and 626b. Therefore, the air passage related to the air passage between the outer wall and the inner wall is simply formed.
  • the above-mentioned 6th form has the modification similar to the 1st form thru
  • the sixth form may be combined with the first to fifth forms, and in particular, the coil outside resin of the first to third forms may be provided, or the fourth to fifth forms may be provided. Fins may be provided.
  • the centrifugal fan 635 another type of fan such as an axial flow fan may be used.
  • a seventh mode of the present invention is a grinder 701 equipped with a brushless motor 721 that is similar to the brushless motor 321B of the third to second modes except for the installation mode and the arrangement of the resin outside the coil.
  • Members and portions similar to those in the 3-2nd embodiment are denoted by the same reference numerals, and description thereof will be appropriately omitted.
  • FIG. 27A is a partial central longitudinal cross sectional view of the grinder 701.
  • FIG. 27(B) is a sectional view taken along the line AA of FIG. 27(A).
  • the grinder 701 includes a brushless motor 721, a resin-made tubular motor housing 722 that holds the brushless motor 721, a battery mounting portion 712 that is provided at a rear end portion of the brushless motor 721, and is capable of mounting a battery pack 713 as a power source, and a brushless motor 721.
  • a switch (not shown) for switching on and off, a gear housing 710 connected to the front end portion of the motor housing 722, and a gear portion 716 arranged in the gear housing 710.
  • the rotary shaft 25 of the rotor 24 of the brushless motor 721 projects forward, drives the gear part 716, and drives the spindle 717, which is connected to the gear part 716 and extends in the vertical direction.
  • the lower end of the spindle 717 extends downward from the lower part of the gear housing 710.
  • the brushless motor 721 is not placed in the motor case 22 including the upper case 26 and the lower case 27, and the outer surface of the stator core 40 of the stator 723 is in contact with the inner surface of the motor housing 722.
  • the coil outside resin 736 has a tubular shape, and is a portion radially outside of the tip end portion of each tooth 41 and located between the coils 45, and beyond the front and rear ends of the stator core 40 of the motor housing 722. It has a portion that contacts the inner surface.
  • the motor housing 722 is a “case” in the present invention because the coil outer resin 736 is in contact therewith.
  • the front end of the coil outer side resin 736 is located on the rear side of the gear part 716, and the rear end of the coil outer side resin 736 is connected to the battery mounting part 712, and the electric component (which is disposed on the front side of the battery mounting part 712). (Not shown) is located on the front side.
  • the grinder 701 is held by a motor housing 722 (case) and has a stator 723 having a stator core 40, a coil 45, and an insulating portion 44 (not shown in FIG. 27) interposed between the stator core 40 and the coil 45, and a stator 723. And a spindle 717 driven by the rotating shaft 25.
  • the stator 723 is provided outside the coils 45 and the stator core 40 and the motor. It has a coil outside resin 736 which is a resin that contacts the housing 722. Therefore, the brushless motor 721 is efficiently radiated by the coil outside resin 736, the stator core 40 and the motor housing 722, and the grinder 701 including the brushless motor 721 having excellent heat radiation is provided.
  • the seventh mode has modifications similar to the first to sixth modes as appropriate.
  • the seventh mode may be combined with the first mode to the sixth mode, in particular, the coil outside resin of the first mode or the second mode may be provided, or the resin of the fourth mode to the fifth mode may be provided. Fins may be provided.
  • the eighth form of the present invention is an impact driver 801 as an example of an impact tool in which a brushless motor 821 similar to the brushless motor 321B of the third to third forms is mounted except for the installation mode and the arrangement of the resin outside the coil. ..
  • a brushless motor 821 similar to the brushless motor 321B of the third to third forms is mounted except for the installation mode and the arrangement of the resin outside the coil. ..
  • Members and portions similar to those in the 3-2nd embodiment are denoted by the same reference numerals, and description thereof will be appropriately omitted.
  • FIG. 28(A) is a partial central longitudinal cross sectional view of the grinder 801.
  • FIG. 28(B) is a sectional view taken along line BB of FIG. 28(A).
  • the impact driver 801 is provided on the brushless motor 821, a resin left and right half-divided motor housing 822 for supporting the left and right side portions thereof, and a lower end portion of a grip portion extending downward from the brushless motor 821 support portion.
  • the motor housing 822 includes a left motor housing 822L and a right motor housing 822R, which are connected by a plurality of screws 832.
  • the rotary shaft 25 of the rotor 24 of the brushless motor 821 projects forward, drives the gear portion 816, and drives a spindle 817 that is connected to the gear portion 816 and extends in the front-rear direction.
  • the front end of the spindle 817 projects forward from the upper front part of the motor housing 822.
  • the brushless motor 821 is not placed in the motor case 22 including the upper case 26 and the lower case 27, and the outer surfaces of the left and right side portions of the stator core 40 of the stator 823 are in contact with the left and right inner surfaces of the upper rear portion of the motor housing 822. ..
  • the coil outside resin 836 has a tubular shape and extends beyond the tip end portion of each tooth 41 in the radial direction and between the coils 45 and the front and rear ends of the left and right side portions of the stator core 40. It has a portion that wraps around and contacts the inner surface of the motor housing 822.
  • the motor housing 822 is a “case” in the present invention because the coil outside resin 836 is in contact therewith.
  • the front end of the coil outer resin 836 is located on the rear side of the gear portion 816, and the rear end of the coil outer resin 836 is located on the rear upper end of the motor housing 822.
  • the impact driver 801 is held by supporting the left and right side portions with respect to the motor housing 822 (case), and the stator core 40, the coil 45, and the insulating portion 44 (not shown in FIG. 28) interposed between the stator core 40 and the coil 45. ), a brushless motor 821 arranged inside the stator 823 and provided with the rotor 24 having the rotating shaft 25, and a spindle 817 driven by the rotating shaft 25. It has a coil outside resin 836 which is a resin that contacts the outside of each coil 45 and the left and right inner surfaces of the stator core 40 and the motor housing 822. Therefore, the brushless motor 821 is efficiently radiated by the coil outside resin 836, the stator core 40, and the motor housing 822, and the impact driver 801 including the brushless motor 821 having excellent heat radiation is provided.
  • the eighth form has modifications appropriately similar to the first to seventh forms.
  • the eighth form may be combined with the first form to the sixth form, and in particular, the coil outside resin of the first form or the second form may be provided, or the fourth form to the fifth form. Fins may be provided.
  • Rotating shaft 36, 236A, 236B, 236C, 336A, 336B, 736, 836..
  • Coil outside resin 40.. Stator core, 44.. Insulation part (insulator), 45.. coil, 237.. fin (of resin outside coil), 338.. high thermal conductor, 339a, 339b.. ventilation port, 627a..
  • outer cylinder part outer wall
  • 627c Inner tube portion (inner wall)
  • 626b outer cylinder part
  • 627d Inner tube portion (inner wall)
  • Through hole vent
  • 635 ⁇ ⁇ Centrifugal fan (fan)
  • 722, 822 ⁇ ⁇ Motor housing (case)
  • 701 ⁇ ⁇ Grinder 801 ⁇ ⁇ Impact driver (impact tool)
  • W1...wind passage W2-W5...wind.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Harvester Elements (AREA)

Abstract

[Problem] To provide an electric work machine comprising a brushless motor having excellent a heat dissipation property. [Solution] A lawn mower, as an example of this electric work machine, is provided with: a main body housing 10; a motor case 22 arranged inside the main body housing 10; a stator 23 that is held by the motor case 22 and has a stator core 40, coils 45, and insulating parts 44 interposed between the stator core 40 and the coils 45; a brushless motor 21 arranged inside the stator 23 and provided with a rotor 24 having a rotary shaft 25; and a spindle 17 driven by the rotary shaft 25. The stator 23 has coil outside resins 36 which are resins making contact with the outsides of the coils 45 and the stator core 40.

Description

電動作業機Electric work machine
　本発明は、電動工具、芝刈機を始めとする園芸工具、及びエア工具用空気圧縮機等の電動作業機に関する。 The present invention relates to an electric power tool, a gardening tool such as a lawn mower, and an electric working machine such as an air compressor for an air tool.
　特開２０１７－７０６８号公報（特許文献１）に示された電動工具である震動ドライバドリルでは、動力源としてブラシレスモータが使用されている。
　ブラシレスモータは、駆動時、コイル及びステータコア並びにロータコア等において発熱する。 A brushless motor is used as a power source in the vibration driver drill, which is the electric tool disclosed in Japanese Unexamined Patent Application Publication No. 2017-7068 (Patent Document 1).
When driven, the brushless motor generates heat in the coil, the stator core, the rotor core, and the like.
特開２０１７－７０６８号公報JP, 2017-7068, A
　ブラシレスモータは、熱が蓄積すると、動作に影響が及ぶ可能性があるため、放熱が行われることが好ましい。
　本発明の主な目的は、放熱性に優れたブラシレスモータを備えた電動作業機を提供することである。 When the brushless motor accumulates heat, the operation of the brushless motor may be affected. Therefore, it is preferable that heat be radiated.
A main object of the present invention is to provide an electric working machine equipped with a brushless motor having excellent heat dissipation.
　請求項１に係る発明は、ケースに保持され、ステータコア、コイル、及び前記ステータコアと前記コイルとの間に介在するインシュレータを有するステータ、並びに、前記ステータの内側に配置され、回転軸を有するロータを備えたブラシレスモータと、前記回転軸により駆動する出力部と、を備えており、前記ステータは、前記コイルの外側、並びに、前記ケース及び前記ステータコアの少なくとも一方に接触する樹脂であるコイル外側樹脂を有することを特徴とするものである。
　請求項２に係る発明は、上記発明において、前記コイルは、複数設けられており、前記コイル外側樹脂は、複数の各前記コイルの外側に共通して接触するよう一連に配置されていることを特徴とするものである。
　請求項３に係る発明は、上記発明において、前記コイルは、複数設けられており、前記コイル外側樹脂は、複数の各前記コイルの間に形成された溝を有していることを特徴とするものである。
　請求項４に係る発明は、上記発明において、前記ケースは、非磁性体の金属製であることを特徴とするものである。
　請求項５に係る発明は、上記発明において、前記コイル外側樹脂は、フィンを有していることを特徴とするものである。
　請求項６に係る発明は、上記発明において、前記コイル外側樹脂は、前記ステータにおける全ての露出した電材を覆っていることを特徴とするものである。
　請求項７に係る発明は、上記発明において、前記ケースは、通風口を有していることを特徴とするものである。
　請求項８に係る発明は、上記発明において、前記コイル外側樹脂は、シリコン樹脂であることを特徴とするものである。
　請求項９に係る発明は、上記発明において、前記ステータコアは、それぞれ内側に突出する複数のティースを有しており、前記コイルは、複数設けられており、前記インシュレータを介して各前記ティースに巻かれており、前記コイル外側樹脂は、各前記ティースの突出端部を覆わないことを特徴とするものである。
　請求項１０に係る発明は、上記発明において、前記ケースは、ケースフィンを有していることを特徴とするものである。
　請求項１１に係る発明は、上記発明において、前記ケースフィンは、前記ケースの外周面に設けられていることを特徴とするものである。
　請求項１２に係る発明は、上記発明において、前記ケースフィンは、テーパ状であることを特徴とするものである。
　請求項１３に係る発明は、上記発明において、前記ケースフィンは、複数設けられており、交互に配置されていることを特徴とするものである。
　請求項１４に係る発明は、上記発明において、前記ケースフィンは、前記ブラシレスモータの回転軸に対して斜行していることを特徴とするものである。
　請求項１５に係る発明は、上記発明において、前記ケースフィンは、前記ケースのスラスト面に設けられていることを特徴とするものである。
　請求項１６に係る発明は、上記発明において、前記ケースフィンは、放射状に延びていることを特徴とするものである。
　請求項１７に係る発明は、上記発明において、前記ケースフィンは、複数設けられており、同心で円筒状に突出していることを特徴とするものである。
　請求項１８に係る発明は、上記発明において、前記ケースフィンは、中心部から外縁へ徐々に近づく渦巻状に延びていることを特徴とするものである。
　請求項１９に係る発明は、上記発明において、前記ケースフィンは、周方向に分割されていることを特徴とするものである。
　請求項２０に係る発明は、ケースに保持され、ステータコア、コイル、及び前記ステータコアと前記コイルとの間に介在するインシュレータを有するステータ、並びに、前記ステータの内側に配置され、回転軸を有するロータを備えたブラシレスモータと、前記回転軸により駆動する出力部と、前記回転軸により駆動するファンと、を備えており、前記ケースは、外壁と内壁とを有しており、前記内壁内に前記ブラシレスモータ及び前記ファンを保持しており、前記ファンによる風は、前記外壁と前記内壁の間を通過することを特徴とするものである。
　請求項２１に係る発明は、上記発明において、前記ケースは、通風口を有していることを特徴とするものである。 According to a first aspect of the present invention, there is provided a stator having a stator core, a coil, and an insulator interposed between the stator core and the coil, which is held in a case, and a rotor arranged inside the stator and having a rotating shaft. A brushless motor provided and an output unit driven by the rotating shaft are provided, and the stator includes a coil outside resin that is a resin that contacts the outside of the coil and at least one of the case and the stator core. It is characterized by having.
According to a second aspect of the present invention, in the above invention, a plurality of the coils are provided, and the resin on the outside of the coils is arranged in series so as to commonly contact the outside of each of the plurality of the coils. It is a feature.
According to a third aspect of the present invention, in the above invention, a plurality of the coils are provided, and the resin outside the coil has a groove formed between each of the plurality of the coils. It is a thing.
According to a fourth aspect of the present invention, in the above invention, the case is made of a non-magnetic metal.
The invention according to claim 5 is characterized in that, in the above invention, the resin on the outside of the coil has fins.
According to a sixth aspect of the present invention, in the above-described invention, the coil outer resin covers all exposed electric materials in the stator.
According to a seventh aspect of the present invention, in the above invention, the case has a ventilation port.
The invention according to claim 8 is characterized in that, in the above-mentioned invention, the resin on the outside of the coil is a silicone resin.
According to a ninth aspect of the present invention, in the above-mentioned invention, the stator core has a plurality of teeth that respectively project inward, a plurality of the coils are provided, and the coils are wound around the teeth via the insulator. The resin outside the coil does not cover the protruding end portion of each tooth.
According to a tenth aspect of the present invention, in the above invention, the case has a case fin.
According to an eleventh aspect of the present invention, in the above invention, the case fin is provided on an outer peripheral surface of the case.
According to a twelfth aspect of the present invention, in the above-mentioned invention, the case fin is tapered.
The invention according to claim 13 is characterized in that, in the above-mentioned invention, a plurality of the case fins are provided and are alternately arranged.
According to a fourteenth aspect of the present invention, in the above-mentioned invention, the case fin is oblique to the rotation shaft of the brushless motor.
According to a fifteenth aspect of the present invention, in the above invention, the case fin is provided on a thrust surface of the case.
The invention according to claim 16 is characterized in that, in the above-mentioned invention, the case fins extend radially.
According to a seventeenth aspect of the present invention, in the above-mentioned invention, a plurality of the case fins are provided and concentrically project in a cylindrical shape.
According to an eighteenth aspect of the present invention, in the above-mentioned invention, the case fin extends in a spiral shape that gradually approaches the outer edge from the central portion.
According to a nineteenth aspect of the present invention, in the above-mentioned invention, the case fin is divided in the circumferential direction.
According to a twentieth aspect of the present invention, there is provided a stator which is held in a case and has a stator core, a coil, and an insulator interposed between the stator core and the coil, and a rotor which is arranged inside the stator and has a rotating shaft. A brushless motor provided, an output unit driven by the rotating shaft, and a fan driven by the rotating shaft are provided, and the case has an outer wall and an inner wall, and the brushless motor is provided in the inner wall. A motor and the fan are held, and the wind from the fan passes between the outer wall and the inner wall.
According to a twenty-first aspect of the present invention, in the above-mentioned invention, the case has a ventilation port.
　本発明の主な効果は、放熱性に優れたブラシレスモータを備えた電動作業機が提供されることである。 The main effect of the present invention is to provide an electric working machine equipped with a brushless motor having excellent heat dissipation.
本発明の第１形態に係る芝刈機の中央縦断面図である。It is a center longitudinal cross-sectional view of the lawnmower which concerns on the 1st form of this invention. 図１の一部拡大図である。It is a partially expanded view of FIG. 図１の芝刈機におけるモータユニットの斜視図である。It is a perspective view of the motor unit in the lawn mower of FIG. 図３のモータユニットの分解斜視図である。It is a disassembled perspective view of the motor unit of FIG. 図３のモータユニットの縦断面図である。It is a longitudinal cross-sectional view of the motor unit of FIG. 図３のモータユニットにおける上ケース部分の横断面図である。It is a cross-sectional view of the upper case portion in the motor unit of FIG. 図３のモータユニットにおける下ケース部分の横断面図である。It is a cross-sectional view of the lower case portion in the motor unit of FIG. 図３のモータユニットにおけるステータコアの鋼板及び割り型の説明図である。It is explanatory drawing of the steel plate and split mold of a stator core in the motor unit of FIG. 図３のモータユニットにおけるブラシレスモータの斜視図である。It is a perspective view of the brushless motor in the motor unit of FIG. 図３のモータユニットにおけるステータの上面図である。It is a top view of the stator in the motor unit of FIG. 図１０のステータの下面図である。FIG. 11 is a bottom view of the stator of FIG. 10. 図１０のステータにおける短絡部材の斜視図（第１～第３金具のみ実線で示される）である。FIG. 11 is a perspective view of a short-circuit member in the stator of FIG. 10 (only the first to third fittings are shown by solid lines). 視点の方向が変えられた図１２同様図である。FIG. 13 is a view similar to FIG. 12 in which the direction of the viewpoint is changed. 図１２の短絡部材の分解斜視図である。It is a disassembled perspective view of the short circuit member of FIG. 図１０のステータにおけるコイルの巻線方法の説明図である。It is explanatory drawing of the winding method of the coil in the stator of FIG. 図１２の短絡部材における第１～第３金具による結線状態を示す上面図である。FIG. 13 is a top view showing a connection state of the first to third fittings in the short-circuit member of FIG. 12. 図１６の第１～第３金具による結線回路図である。FIG. 17 is a wiring circuit diagram by the first to third fittings of FIG. 16. 本発明の第２－１形態に係る芝刈機の図６に相当する説明図である。It is explanatory drawing corresponded to FIG. 6 of the lawnmower which concerns on the 2-1st form of this invention. 本発明の第２－２形態に係る芝刈機の図６に相当する説明図である。It is explanatory drawing corresponded to FIG. 6 of the lawn mower which concerns on the 2-2nd form of this invention. 本発明の第２－３形態に係る芝刈機の図６に相当する説明図である。It is explanatory drawing corresponded to FIG. 6 of the lawnmower which concerns on the 2nd-3rd form of this invention. 本発明の第３－１形態に係る芝刈機の図５相当図であって、（Ａ）コイル外側樹脂が示されないもの，（Ｂ）コイル外側樹脂の端面がハッチングで示されるものである。FIG. 6 is a view corresponding to FIG. 5 of the lawn mower according to Embodiment 3-1 of the present invention, in which (A) the coil outside resin is not shown, and (B) the end surface of the coil outside resin is shown by hatching. 本発明の第３－２形態に係る芝刈機の図５相当図であって、（Ａ）コイル外側樹脂が示されないもの，（Ｂ）コイル外側樹脂の端面がハッチングで示されるものである。FIG. 6 is a view corresponding to FIG. 5 of the lawnmower according to the third to second aspects of the present invention, in which (A) the coil outside resin is not shown, and (B) the end surface of the coil outside resin is shown by hatching. 本発明の（Ａ）第１形態，（Ｂ）第４－１形態，（Ｃ）第４－２形態，（Ｄ）第４－３形態，（Ｅ）第４－４形態に係る芝刈機のモータケースにおけるフィンの側方視形状の説明図（一部展開図）である。A lawn mower according to (A) 1st form, (B) 4-1 form, (C) 4-2 form, (D) 4-3 form, and (E) 4-4 form of the present invention. It is explanatory drawing (partially expanded view) of the side view shape of the fin in a motor case. 本発明の（Ａ）第１形態，（Ｂ）第５－１形態，（Ｃ）第５－２形態，（Ｄ）第５－３形態に係る芝刈機のモータケースにおけるフィン群の上面視形状の説明図である。Top view shapes of fin groups in the motor case of the lawn mower according to (A) 1st form, (B) 5-1 form, (C) 5-2 form, and (D) 5-3 form of the present invention. FIG. 本発明の（Ａ）第５－４形態，（Ｂ）第５－５形態，（Ｃ）第５－６形態，（Ｄ）第５－７形態，（Ｅ）第５－８形態，（Ｆ）第５－９形態に係る芝刈機のモータケースにおけるフィン群の上面視形状の説明図である。(A) 5-4th embodiment, (B) 5-5th embodiment, (C) 5-6th embodiment, (D) 5-7th embodiment, (E) 5-8th embodiment, (F) of the present invention ) It is an explanatory view of a top view shape of a fin group in the motor case of the lawn mower according to the fifth to ninth aspects. 本発明の第６形態に係る芝刈機のモータユニットの縦断面説明図である。It is a longitudinal section explanatory view of a motor unit of a lawn mower concerning the 6th form of the present invention. 本発明の第７形態に係るグラインダの（Ａ）一部中央縦断面説明図，（Ｂ）（Ａ）のＡ－Ａ線断面説明図である。It is (A) partial center longitudinal cross-section explanatory drawing of the grinder which concerns on the 7th form of this invention, (B) (A) AA line cross-section explanatory drawing. 本発明の第８形態に係るインパクトドライバの（Ａ）一部中央縦断面説明図，（Ｂ）（Ａ）のＢ－Ｂ線断面説明図である。It is a partial center longitudinal cross-sectional explanatory view of (A) of the impact driver which concerns on 8th form of this invention, (B) BB line sectional explanatory drawing of (A).
　以下、本発明の実施の形態及びその変更例が、適宜図面に基づいて説明される。
　当該形態及び変更例における前後上下左右は、説明の便宜上定めたものであり、作業の状況及び移動する部材の状態等により変化することがある。
　尚、本発明は、下記の形態及び変更例に限定されない。 Embodiments of the present invention and modifications thereof will be described below with reference to the drawings as appropriate.
The front, rear, upper, lower, left, and right in the form and the modified example are determined for convenience of description, and may change depending on the work situation, the state of moving members, and the like.
The present invention is not limited to the following modes and modifications.
［第１形態］
　図１は、本発明の第１形態に係る電動作業機（園芸工具）の一例である充電式の芝刈機１の中央縦断面図である。図２は、図１の一部拡大図である。
　芝刈機１は、前後方向に延びて下面を開口させたベース２と、ベース２の中央上側に連結される本体３と、その後部から後方斜め上方に延びる枠形のハンドル４と、を備えている。尚、方向はハンドル４を握る使用者を基準とし、図１の左が芝刈機１の前であり、図１の上が芝刈機１の上である。 [First form]
FIG. 1 is a central longitudinal sectional view of a rechargeable lawnmower 1 which is an example of an electric working machine (gardening tool) according to a first embodiment of the present invention. FIG. 2 is a partially enlarged view of FIG.
The lawn mower 1 includes a base 2 that extends in the front-rear direction and has an open lower surface, a main body 3 that is connected to the upper center of the base 2, and a frame-shaped handle 4 that extends rearward and obliquely upward from the rear portion. There is. The direction is based on the user holding the handle 4, the left side of FIG. 1 is in front of the lawn mower 1, and the upper side of FIG. 1 is on the lawn mower 1.
　ベース２は、前後にそれぞれ一対の車輪５を有してハンドル４によって前後への進退動が可能となっている。
　ベース２の後端でハンドル４の下方には、リヤカバー６と集草カゴ７とが設けられている。
　ハンドル４の後端には、スイッチレバー８が設けられ、その前方には、常態でスイッチレバー８の操作をロックするロックオフボタン９が設けられている。ロックオフボタン９が押し操作されてスイッチレバー８のロックが解除されると、スイッチレバー８の引き操作が可能となる。 The base 2 has a pair of wheels 5 on the front and the rear, respectively, and can be moved back and forth by a handle 4.
A rear cover 6 and a grass basket 7 are provided below the handle 4 at the rear end of the base 2.
A switch lever 8 is provided at the rear end of the handle 4, and a lock-off button 9 that normally locks the operation of the switch lever 8 is provided in front of the switch lever 8. When the lock-off button 9 is pushed to unlock the switch lever 8, the switch lever 8 can be pulled.
　本体３は、下向きに開口する下端の筒状部１１をベース２内に突出させた外側ハウジングとしての本体ハウジング１０を有する。本体ハウジング１０の上部には、電源となるバッテリパック１３を後方上側から差し込み装着可能なバッテリ装着部１２が前下がり形成されている。バッテリ装着部１２は、バッテリカバー１４によって開閉可能となっている。
　又、本体ハウジング１０の前部には、図示されない制御回路基板を備えたコントローラ１５が上下方向に立った状態で支持されている。制御回路基板は、マイコン及び複数（１２個）のスイッチング素子を備えている。
　コントローラ１５の後方でバッテリ装着部１２の下方には、モータユニット１６が設けられている。モータユニット１６からは、ブラシレスモータ２１の回転軸２５が下向きに突出しており、その下端には、スピンドル１７が同軸で連結されている。スピンドル１７は、筒状部１１からベース２内で下向きに突出しており、スピンドル１７の下端には、インナフランジ１８及びボルト１９によって、水平な板状の刈刃２０が、直交状に取り付けられている（出力部）。 The main body 3 has a main body housing 10 as an outer housing in which a cylindrical portion 11 at the lower end that opens downward is projected into the base 2. On the upper part of the main body housing 10, a battery mounting portion 12 into which a battery pack 13 as a power source can be inserted and mounted from the upper rear side is formed so as to be lowered frontward. The battery mounting portion 12 can be opened and closed by a battery cover 14.
A controller 15 having a control circuit board (not shown) is supported on the front of the main body housing 10 in a vertically standing state. The control circuit board includes a microcomputer and a plurality (12) of switching elements.
A motor unit 16 is provided behind the controller 15 and below the battery mounting portion 12. A rotary shaft 25 of the brushless motor 21 projects downward from the motor unit 16, and a spindle 17 is coaxially connected to the lower end of the rotary shaft 25. The spindle 17 projects downward from the tubular portion 11 in the base 2, and a horizontal plate-shaped cutting blade 20 is attached to the lower end of the spindle 17 by an inner flange 18 and a bolt 19 in an orthogonal manner. Yes (output section).
　モータユニット１６は、図３及び図４にも示されるように、ブラシレスモータ２１と、ブラシレスモータ２１を保持するモータケース２２とを有する。
　ブラシレスモータ２１は、筒状のステータ２３と、ステータ２３の内側を貫通して軸心に回転軸２５を有するロータ２４とを備えるインナロータ型である。
　モータケース２２は、ステータ２３を上下から保持して回転軸２５を回転可能に支持する上ケース２６及び下ケース２７を有する。下ケース２７は、筒状部１１の上側に設けられたベース２８に対して組み付けられている。ベース２８の上側には、モータユニット１６を上方から覆うモータカバー２９が設けられている。
　一方、ベース２８の下側には、軸受３１を介してスピンドル１７を回転可能に支持するベアリングリテーナ３０が、下方からの複数のネジ３２によって組み付けられている。ベアリングリテーナ３０を貫通するスピンドル１７の下端が、筒状部１１の下端にネジ止めされたバッフル板３３を貫通してベース２内に突出している。
　刈刃２０を装着するインナフランジ１８には、スピンドル１７の下端が嵌合する筒部３４が設けられている。筒部３４の外周には、遠心ファン３５が設けられている。本体ハウジング１０における遠心ファン３５の径方向外方の部分には、図示されない排気口が配置されている。尚、遠心ファン３５は、軸流ファン等とされても良いし、省略されても良い。 As shown in FIGS. 3 and 4, the motor unit 16 has a brushless motor 21 and a motor case 22 that holds the brushless motor 21.
The brushless motor 21 is an inner rotor type that includes a cylindrical stator 23 and a rotor 24 that penetrates the inside of the stator 23 and has a rotating shaft 25 at its axis.
The motor case 22 has an upper case 26 and a lower case 27 that hold the stator 23 from above and below and rotatably support the rotating shaft 25. The lower case 27 is attached to a base 28 provided on the upper side of the tubular portion 11. A motor cover 29 that covers the motor unit 16 from above is provided on the upper side of the base 28.
On the other hand, below the base 28, a bearing retainer 30 that rotatably supports the spindle 17 via a bearing 31 is assembled by a plurality of screws 32 from below. The lower end of the spindle 17 penetrating the bearing retainer 30 penetrates the baffle plate 33 screwed to the lower end of the tubular portion 11 and projects into the base 2.
The inner flange 18 on which the cutting blade 20 is mounted is provided with a cylindrical portion 34 into which the lower end of the spindle 17 is fitted. A centrifugal fan 35 is provided on the outer circumference of the cylindrical portion 34. An exhaust port (not shown) is arranged in a portion of the main body housing 10 radially outside the centrifugal fan 35. The centrifugal fan 35 may be an axial fan or the like, or may be omitted.
　図４ないしは図７にも示されるブラシレスモータ２１のステータ２３は、複数の鋼板４０ａ（図８）が軸方向に積層されており内側に複数（１２個）のティース４１が突出したステータコア４０と、ステータコア４０の上下両端に一体成形された樹脂製の電気絶縁部材としての上インシュレータ４２及び下インシュレータ４３と、これらと連続して一体成形され、ステータコア４０の内周面及び各ティース４１の突出端面を除く外周面を覆う樹脂製の絶縁部４４と、絶縁部４４を介して各ティース４１に巻かれるコイル４５と、を含んでいる。
　更に、各ティース４１に巻かれたコイル４５の外周面を共通して覆うコイル外側樹脂３６が設けられている。ここでは、コイル外側樹脂３６は、コイル４５の巻かれたステータコア４０にコイル外側樹脂３６を一体成形することで設けられる（樹脂モールド）。コイル外側樹脂３６は、伝熱性の良好なシリコン樹脂（伝熱性非磁性体）である。又、コイル外側樹脂３６は、各ティース４１の突出端部を覆わず、各ティース４１の間に行き渡っている。尚、コイル外側樹脂３６は、シリコン樹脂以外の樹脂であっても良い。又、コイル外側樹脂３６は、各ティース４１の突出端部を覆っても良い。更に、コイル外側樹脂３６は、コイル４５の一部が露出する状態で配置されても良い。
　上インシュレータ４２には、コイル４５を形成するワイヤと電気的に接続されて三相結線を形成する短絡部材４６と、ロータ２４の回転位置を検出するセンサ回路基板４７とが組み付けられている。 The stator 23 of the brushless motor 21, which is also shown in FIG. 4 or FIG. 7, has a plurality of steel plates 40a (FIG. 8) stacked in the axial direction, and a stator core 40 having a plurality of (12) teeth 41 protruding inside. An upper insulator 42 and a lower insulator 43 as resin-made electric insulating members integrally formed on both upper and lower ends of the stator core 40, and an inner peripheral surface of the stator core 40 and protruding end surfaces of each tooth 41 are integrally formed continuously with these. It includes a resin-made insulating portion 44 that covers the outer peripheral surface except for, and a coil 45 that is wound around each tooth 41 through the insulating portion 44.
Further, a coil outside resin 36 is provided to commonly cover the outer peripheral surface of the coil 45 wound around each tooth 41. Here, the coil outside resin 36 is provided by integrally molding the coil outside resin 36 on the stator core 40 around which the coil 45 is wound (resin mold). The coil outside resin 36 is a silicon resin (heat-conducting non-magnetic material) having good heat conductivity. Further, the coil outer side resin 36 does not cover the protruding end portion of each tooth 41, but spreads between each tooth 41. The coil outside resin 36 may be a resin other than the silicone resin. The coil outer side resin 36 may cover the protruding end portions of the teeth 41. Further, the coil outside resin 36 may be arranged in a state where a part of the coil 45 is exposed.
The upper insulator 42 is assembled with a short circuit member 46 that is electrically connected to a wire that forms the coil 45 to form a three-phase connection, and a sensor circuit board 47 that detects the rotational position of the rotor 24.
　ステータコア４０の周面には、周方向に等間隔に３つの突条４８Ａ，４８Ａ，４８Ｂが形成されている。
　突条４８Ａ，４８Ａは、周方向の幅がステータコア４０の径方向外側へ行くに従い小さくなるテーパ状の横断面形状を有している。
　突条４８Ｂは、テーパ状でなく、周方向の幅が径方向に沿って変わらない四角形の横断面形状を有している。突条４８Ｂの径方向外側の端面には、周方向に沿って外側へ膨らむ僅かなＲ（曲面）が付与されている。
　又、突条４８Ａ，４８Ａ，４８Ｂには、それぞれ貫通孔４９が形成されている。 On the circumferential surface of the stator core 40, three protrusions 48A, 48A, 48B are formed at equal intervals in the circumferential direction.
The ridges 48A, 48A have a tapered cross-sectional shape in which the width in the circumferential direction becomes smaller toward the radially outer side of the stator core 40.
The ridge 48B is not tapered and has a quadrangular cross-sectional shape whose circumferential width does not change along the radial direction. A slight R (curved surface) that bulges outward along the circumferential direction is provided on the radially outer end surface of the protrusion 48B.
Further, through holes 49 are formed in the protrusions 48A, 48A and 48B, respectively.
　図８に示されるように、突条４８Ａ，４８Ａ，４８Ｂは、各鋼板４０ａに形成される突起５０Ａ，５０Ａ，５０Ｂが重なって形成される。
　各突起５０Ａは、周方向の幅がステータコア４０の径方向外側へ行くに従い小さくなるテーパ状に形成される。
　突起５０Ｂは、テーパ状でなく、周方向の幅が径方向に沿って変わらない四角形の横断面形状となる。突起５０Ｂの径方向外側の端縁には、周方向に沿って外側へ膨らむ僅かなＲ（曲面）が付与されている。
　突起５０Ａ，５０Ａ，５０Ｂには、それぞれ貫通孔４９が形成される。
　又、突起５０Ａ，５０Ａ，５０Ｂの各間には、切り欠き５２が形成される。この切り欠き５２により、突条４８Ａ，４８Ａ，４８Ｂの各間に、ステータ２３の製造時の位置決め用の溝５３が形成されるようになっている。 As shown in FIG. 8, the protrusions 48A, 48A, 48B are formed by overlapping the protrusions 50A, 50A, 50B formed on each steel plate 40a.
Each of the protrusions 50A is formed in a taper shape in which the width in the circumferential direction becomes smaller toward the radially outer side of the stator core 40.
The protrusion 50B is not tapered and has a rectangular cross-sectional shape whose circumferential width does not change along the radial direction. A slight R (curved surface) that bulges outward along the circumferential direction is provided on the radially outer end edge of the protrusion 50B.
A through hole 49 is formed in each of the protrusions 50A, 50A and 50B.
A notch 52 is formed between each of the protrusions 50A, 50A, 50B. Due to the notch 52, a groove 53 for positioning the stator 23 at the time of manufacturing is formed between the protrusions 48A, 48A, 48B.
　各突条４８Ａがテーパ状であるため、上インシュレータ４２、下インシュレータ４３及び絶縁部４４が一体成形される際、金型との干渉が防止される。
　即ち、図８において二点鎖線で示された左右の割り型５４でステータコア４０に上インシュレータ４２、下インシュレータ４３及び絶縁部４４が一体成形される際、各割り型５４に対してテーパ状の２つの突条４８Ａ，４８Ａを左右に位置させることで、図８の左右方向に動作する割り型５４に対し、突条４８Ａ，４８Ａがテーパ面によって干渉しないようになっている。この動作方向に対するテーパの角度θは、ここでは３°である。又、突条４８Ｂの端面には、外側へ膨らむＲが付与されている。よって、左右の割り型５４との干渉が防止される。尚、角度θは、３°に限定されず、１°以上１０°以下の範囲で適宜設定されても良い。 Since each protrusion 48A has a tapered shape, interference with the mold is prevented when the upper insulator 42, the lower insulator 43, and the insulating portion 44 are integrally molded.
That is, when the upper insulator 42, the lower insulator 43, and the insulating portion 44 are integrally molded with the stator core 40 by the left and right split molds 54 shown by the two-dot chain line in FIG. By positioning the two ridges 48A, 48A on the left and right, the ridges 48A, 48A do not interfere with the split mold 54 that moves in the left-right direction in FIG. 8 due to the tapered surface. The taper angle θ with respect to this operation direction is 3° here. In addition, R that bulges outward is given to the end surface of the protrusion 48B. Therefore, interference with the left and right split molds 54 is prevented. The angle θ is not limited to 3°, and may be set appropriately within the range of 1° to 10°.
　ロータ２４は、複数の鋼板４０ａが軸方向に積層された円筒状のロータコア５５と、その軸心を貫通する回転軸２５とを有する。ロータコア５５と回転軸２５とは、樹脂５６によって一体に形成される。回転軸２５の下端には、面取部５７（図４）が形成されている。
　回転軸２５の外周で樹脂５６の充填領域には、回転軸回り止め部及び回転軸滑り止め部としての綾目ローレット２５ａが形成され、又回転軸２５の外周面には、微小な凹凸が格子状に形成されている。
　ロータコア５５の周縁部には、同心円上に複数（８個）の磁石孔５８が軸方向に貫通形成され、各磁石孔５８には、板状の永久磁石５９が埋設されている。各永久磁石５９の内側には、上下両端を除いて鋼板４０ａに形成された透孔の積層により、肉盗みとしての空間部６０が形成され、ロータ２４の軽量化が図られている。 The rotor 24 has a cylindrical rotor core 55 in which a plurality of steel plates 40a are laminated in the axial direction, and a rotating shaft 25 penetrating the axial center thereof. The rotor core 55 and the rotary shaft 25 are integrally formed of resin 56. A chamfer 57 (FIG. 4) is formed at the lower end of the rotary shaft 25.
On the outer circumference of the rotary shaft 25, a twill knurl 25a is formed in the resin 56 filling area as a rotary shaft stopper and a rotary shaft slip stopper, and minute irregularities are formed on the outer peripheral surface of the rotary shaft 25 in a grid pattern. It is formed into a shape.
A plurality of (eight) magnet holes 58 are concentrically formed through the periphery of the rotor core 55 in the axial direction, and a plate-shaped permanent magnet 59 is embedded in each magnet hole 58. Inside each of the permanent magnets 59, a space portion 60 as a meat steal is formed by stacking through holes formed in the steel plate 40a excluding the upper and lower ends, and the weight of the rotor 24 is reduced.
　モータケース２２の上ケース２６及び下ケース２７は、それぞれステータ２３の上部及び下部に被さる円形カップ状を有している。
　上ケース２６は、アルミ合金等の非磁性体の金属で形成され、図３ないし図５に示されるように、上面外周から側面にかけて、上下方向の放熱用のフィン６５が、複数、周方向へ所定間隔を置いて立設されている。上ケース２６は、ここでは金型鋳造（ダイカスト）により形成され、各フィン６５は、金型の抜きを円滑にするため、上方へ行くほど幅が太い（厚みが小さい）テーパ状となっている。尚、上ケース２６は、樹脂等の他の材質で形成されても良い。
　上ケース２６の上面中央には、上軸受保持部６６が形成され、樹脂製の絶縁キャップ６７を介して軸受６８が保持されて、回転軸２５の上端を支持している。上軸受保持部６６の中心には、透孔６９が形成されており、樹脂キャップ７０によって閉塞されている。
　更に、上ケース２６の周面には、周方向に等間隔を置いて、径方向外側へ膨らむ３つのネジボス部７１Ａ，７１Ａ，７１Ｂが、上下方向に形成されている。ネジボス部７１Ａ，７１Ａ，７１Ｂは、ステータコア４０の突条４８Ａ，４８Ａ，４８Ｂに対応するもので、ネジボス部７１Ａ，７１Ａ，７１Ｂの下端は、順に突条４８Ａ，４８Ａ，４８Ｂに嵌合する横断面テーパ状又は横断面四角形状に開口している。上ケース２６の周面で突条４８Ａ，４８Ａ，４８Ｂの各間には、下端から上向きにスリット７２が形成されている。 The upper case 26 and the lower case 27 of the motor case 22 have a circular cup shape that covers the upper and lower portions of the stator 23, respectively.
The upper case 26 is made of a non-magnetic metal such as an aluminum alloy, and as shown in FIGS. 3 to 5, a plurality of fins 65 for heat radiation in the vertical direction are provided in the circumferential direction from the outer circumference of the upper surface to the side surfaces. It is erected at a predetermined interval. The upper case 26 is formed here by die casting (die casting), and each fin 65 has a taper shape in which the width increases (the thickness decreases) as it goes upward in order to facilitate the removal of the die. .. The upper case 26 may be made of other material such as resin.
An upper bearing holding portion 66 is formed in the center of the upper surface of the upper case 26, and a bearing 68 is held via a resin insulating cap 67 to support the upper end of the rotary shaft 25. A through hole 69 is formed at the center of the upper bearing holding portion 66 and is closed by a resin cap 70.
Further, on the peripheral surface of the upper case 26, three screw boss portions 71A, 71A, 71B that bulge outward in the radial direction are formed at equal intervals in the circumferential direction in the vertical direction. The screw boss portions 71A, 71A, 71B correspond to the protrusions 48A, 48A, 48B of the stator core 40, and the lower ends of the screw boss portions 71A, 71A, 71B are cross-sections that are fitted to the protrusions 48A, 48A, 48B in order. The opening is tapered or rectangular in cross section. A slit 72 is formed upward from the lower end between the protrusions 48A, 48A, 48B on the peripheral surface of the upper case 26.
　下ケース２７は、上ケース２６と同様に成り、中央に下軸受保持部７４が形成される円形の端面部７３と、端面部７３の外周から上向きに立ち上がる筒状部７５とを有している。下軸受保持部７４には、軸受７６が保持されており、下軸受保持部７４を貫通する回転軸２５を支持している。筒状部７５の外周には、ベース２８へのネジ止め用のボス７７が、複数（４箇所）、周方向に等間隔を置いて下向きに形成されている。
　又、下軸受保持部７４を除く端面部７３の内面と、筒状部７５の内周及び各ボス７７を除く外周とには、端面部７３の内面から筒状部７５の内周及び外周までを連続して被覆する樹脂層７８が形成されている。樹脂層７８におけるステータコア４０の突条４８Ａ，４８Ａ，４８Ｂに対応する位置には、対応する上ケース２６のネジボス部７１Ａ，７１Ａ，７１Ｂと同形状のボス部７９Ａ，７９Ａ，７９Ｂが軸方向に形成されている。ボス部７９Ａ，７９Ａ，７９Ｂの上端は、それぞれ突条４８Ａ，４８Ａ，４８Ｂに嵌合する横断面テーパ状又は横断面四角形状に開口した貫通孔を備えている。更に、ボス部７９Ａ，７９Ａ，７９Ｂの下側には、凹溝８０がそれぞれ連続状に形成されている。 The lower case 27 is similar to the upper case 26, and has a circular end surface portion 73 in which a lower bearing holding portion 74 is formed in the center, and a cylindrical portion 75 that rises upward from the outer periphery of the end surface portion 73. .. A bearing 76 is held by the lower bearing holding portion 74 and supports the rotating shaft 25 penetrating the lower bearing holding portion 74. On the outer periphery of the tubular portion 75, a plurality of (four places) bosses 77 for screwing the base 28 are formed downward at equal intervals in the circumferential direction.
Further, from the inner surface of the end surface portion 73 to the inner circumference and outer circumference of the tubular portion 75, the inner surface of the end surface portion 73 excluding the lower bearing holding portion 74 and the inner circumference of the tubular portion 75 and the outer circumference excluding each boss 77 are included. Is formed continuously. Boss portions 79A, 79A, 79B having the same shape as the corresponding screw boss portions 71A, 71A, 71B of the upper case 26 are formed in the resin layer 78 at positions corresponding to the protrusions 48A, 48A, 48B of the stator core 40 in the axial direction. Has been done. The upper ends of the boss portions 79A, 79A, 79B are provided with through holes that are tapered in the cross section or square in the cross section and are fitted into the ridges 48A, 48A, 48B, respectively. Further, concave grooves 80 are continuously formed below the bosses 79A, 79A, 79B.
　モータケース２２の上ケース２６は、ステータ２３の上方から、ステータコア４０の突条４８Ａ，４８Ａ，４８Ｂにネジボス部７１Ａ，７１Ａ，７１Ｂを合わせて被せられると共に、ロータ２４の回転軸２５の上端に組み付けた軸受６８を、上軸受保持部６６で保持する。
　他方、下ケース２７は、ステータ２３の下方から、ステータコア４０の突条４８Ａ，４８Ａ，４８Ｂにボス部７９Ａ，７９Ａ，７９Ｂを合わせて被せられると共に、回転軸２５の下端に組み付けた軸受７６を、下軸受保持部７４で保持する。
　この状態で、下ケース２７のボス部７９Ａ，７９Ａ，７９Ｂに、下方からそれぞれネジ８１が差し込まれて、突条４８Ａ，４８Ａ，４８Ｂを通り、上ケース２６のネジボス部７１Ａ，７１Ａ，７１Ｂに達するように入れられる。すると、ステータコア４０の外周の一部を除いて上ケース２６と下ケース２７とで覆われるブラシレスモータ２１、即ちモータユニット１６が得られる。 The upper case 26 of the motor case 22 is covered with the screw boss portions 71A, 71A, 71B of the stator core 40 from above the stator 23 so as to fit the screw boss portions 71A, 71A, 71B, and is attached to the upper end of the rotary shaft 25 of the rotor 24. The bearing 68 is held by the upper bearing holding portion 66.
On the other hand, the lower case 27 covers the protrusions 48A, 48A, 48B of the stator core 40 with the bosses 79A, 79A, 79B from below the stator 23, and the bearing 76 mounted on the lower end of the rotary shaft 25. It is held by the lower bearing holding portion 74.
In this state, screws 81 are inserted into the boss portions 79A, 79A, 79B of the lower case 27 from below, pass through the protrusions 48A, 48A, 48B, and reach the screw boss portions 71A, 71A, 71B of the upper case 26. Can be put in. Then, the brushless motor 21, that is, the motor unit 16 covered with the upper case 26 and the lower case 27 except for a part of the outer periphery of the stator core 40 is obtained.
　ブラシレスモータ２１には、内部金属であるステータコア４０を充電部であるコイル４５との間に介在される基礎絶縁部材（一体成形される上インシュレータ４２、下インシュレータ４３及び絶縁部４４）による基礎絶縁が施される。
　又、回転軸２５とロータコア５５との間に介在される回転軸側絶縁部材としての樹脂５６と、上ケース２６と回転軸２５との間に介在される絶縁キャップ６７と、下ケース２７の筒状部７５とステータコア４０との間に介在される樹脂層７８とによる付加絶縁がそれぞれ施される。
　よって、ステータコア４０と回転軸２５との間は、二重に絶縁される。
　又、上ケース２６と下ケース２７との間に上下方向の隙間が空くことで、ステータ２３の軸方向の寸法が変化しても、組み付けが可能である。 The brushless motor 21 is provided with basic insulation by a basic insulating member (an upper insulator 42, a lower insulator 43 and an insulating portion 44 which are integrally molded) interposed between a stator core 40 which is an internal metal and a coil 45 which is a charging portion. Given.
Further, a resin 56 as a rotary shaft side insulating member interposed between the rotary shaft 25 and the rotor core 55, an insulating cap 67 interposed between the upper case 26 and the rotary shaft 25, and a cylinder of the lower case 27. Additional insulation is provided by the resin layer 78 interposed between the shaped portion 75 and the stator core 40.
Therefore, the stator core 40 and the rotating shaft 25 are doubly insulated.
Further, since a vertical gap is formed between the upper case 26 and the lower case 27, the stator 23 can be assembled even if the axial dimension of the stator 23 changes.
　モータユニット１６は、回転軸２５を下向きにしてベース２８上に載置された状態で、ベース２８の下方から各ボス７７にネジが入れられることで、ベース２８に固定される。下ケース２７の端面部７３の下面には、筒状部１１に嵌合してモータユニット１６を位置決めする同心円上の一対の円弧リブ７３ａが形成されている（図２及び図５）。
　モータユニット１６に被さるモータカバー２９は、上ケース２６の上軸受保持部６６を含む中央部分が露出した状態でモータユニット１６を覆う。モータカバー２９の内面には、上ケース２６の各フィン６５が近接している。
　ブラシレスモータ２１のステータ２３は、突条４８Ａ，４８Ａ，４８Ｂを貫通するネジ８１と、突条４８Ａ，４８Ａ，４８Ｂに嵌合する、上ケース２６のネジボス部７１Ａ，７１Ａ，７１Ｂ及び下ケース２７のボス部７９Ａ，７９Ａ，７９Ｂとによって、モータケース２２に対して回り止めされる。 The motor unit 16 is fixed to the base 28 by placing a screw in each boss 77 from below the base 28 in a state where the motor unit 16 is placed on the base 28 with the rotating shaft 25 facing downward. On the lower surface of the end surface portion 73 of the lower case 27, a pair of concentric circular arc ribs 73a for fitting the tubular portion 11 and positioning the motor unit 16 are formed (FIGS. 2 and 5).
The motor cover 29 covering the motor unit 16 covers the motor unit 16 in a state where the central portion including the upper bearing holding portion 66 of the upper case 26 is exposed. The fins 65 of the upper case 26 are close to the inner surface of the motor cover 29.
The stator 23 of the brushless motor 21 includes a screw 81 penetrating the ridges 48A, 48A, 48B and screw boss portions 71A, 71A, 71B of the upper case 26 and the lower case 27 which are fitted to the ridges 48A, 48A, 48B. The boss portions 79A, 79A, 79B prevent the motor case 22 from rotating.
　図９及び図１０にも示されるように、上インシュレータ４２は、ステータコア４０の上側端面に一体成形されるリング体であり、その上面には、短絡部材４６に設けられた複数（１２個）のヒュージング端子９９をそれぞれ保持する端子保持部８５が、周方向に等間隔に設けられている。
　各端子保持部８５は、内周側の内壁部８６と、外周側の外壁部８７とを、径方向にワイヤ１１５の直径に略相当する間隔を置いて立設したものであり、内壁部８６と外壁部８７との周方向の中央には、ヒュージング端子９９を嵌合させる嵌合溝８８が形成されている。
　又、インシュレータ４２の上面には、短絡部材４６の組み付け用の止めボス８９が、複数（５箇所）、１つ置きのティース４１の根元に当たる位置で突設されている。
　図１１にも示されるように、下インシュレータ４３は、ステータコア４０の下側端面に一体成形されるリング体であり、その下面には、各ティース４１の根元から周方向にずれた位置で、周方向に延びる複数（１２個）のガイド壁９０が立設されている。 As shown in FIGS. 9 and 10, the upper insulator 42 is a ring body integrally formed with the upper end surface of the stator core 40, and a plurality (12 pieces) of the short-circuit member 46 (12 pieces) provided on the upper surface thereof are provided on the upper surface thereof. Terminal holding portions 85 for holding the fusing terminals 99 are provided at equal intervals in the circumferential direction.
Each terminal holding portion 85 is formed by vertically arranging an inner wall portion 86 on the inner peripheral side and an outer wall portion 87 on the outer peripheral side with a gap substantially corresponding to the diameter of the wire 115 in the radial direction. A fitting groove 88 for fitting the fusing terminal 99 is formed in the center of the outer wall portion 87 and the outer wall portion 87 in the circumferential direction.
Further, on the upper surface of the insulator 42, a plurality of stop bosses 89 for assembling the short-circuit member 46 (five places) are provided in a protruding manner at positions where they come into contact with the bases of the teeth 41 at every other position.
As shown in FIG. 11, the lower insulator 43 is a ring body integrally formed with the lower end surface of the stator core 40, and the lower surface thereof is circumferentially displaced from the root of each tooth 41. A plurality of (12) guide walls 90 extending in the direction are erected.
　短絡部材４６は、上インシュレータ４２よりも一回り小さい樹脂製のリング体であり、その外周には、上インシュレータ４２の止めボス８９にそれぞれ上方から嵌合する四角筒状の複数（５つ）の嵌合ボス９５と、ステータコア４０の各溝５３に係合する複数（３つ）のリブ９６とが突設されている。
　又、図１２ないし図１４にも示されるように、短絡部材４６は、外周から内周へ行くに従い軸方向の厚みが上面から段階的に小さくなる階段状に形成されており、各厚み部分に、最も肉厚の外周部分に位置する最大径の第１金具９７Ｕと、その内側の肉厚の中間部分に位置する中間径の第２金具９７Ｗと、その内側の内周部分に位置する最小径の第３金具９７Ｖとがそれぞれ同心円上に配置されてインサート成形されている。尚、符号の一部におけるＵ，Ｗ，Ｖは、それぞれ対応する三相電流のＵ相，Ｗ相，Ｖ相に関わることを意味する。 The short-circuit member 46 is a resin ring body that is slightly smaller than the upper insulator 42, and has a plurality of (five) rectangular tubular members that fit into the stopper bosses 89 of the upper insulator 42 from above on the outer periphery thereof. The fitting boss 95 and a plurality of (three) ribs 96 that engage with the grooves 53 of the stator core 40 are provided in a protruding manner.
Further, as shown in FIGS. 12 to 14, the short-circuit member 46 is formed in a step-like shape in which the axial thickness gradually decreases from the upper surface from the outer circumference to the inner circumference. , The maximum diameter of the first metal fitting 97U located in the outermost part of the wall thickness, the second metal fitting 97W of the intermediate diameter located in the middle part of the inner wall thickness, and the minimum diameter located in the inner peripheral part of the inner wall The third metal fitting 97V and the third metal fitting 97V are arranged concentrically and are insert-molded. In addition, U, W, and V in a part of reference numerals mean that they are related to the U phase, W phase, and V phase of the corresponding three-phase currents, respectively.
　第１～第３金具９７Ｕ～９７Ｖは、上面視が“Ｃ”字状の帯板であり、両端部と、両端部の点対称位置との複数（４）箇所には、径方向外側へ突出する突出片９８が形成されている。各突出片９８の先端には、ヒュージング端子９９が形成されている。ヒュージング端子９９は、一旦下方へ曲がり、上方へ折り返されて更に外向きに曲げられている。
　第１金具９７Ｕにおける一方の端部の突出片９８の根元には、電源線１００Ｕをスポット溶接するための溶接部１０１が形成され、第２，第３金具９７Ｗ，９７Ｕにおける第１金具９７Ｕと反対側の端部の突出片９８の根元にも、電源線１００Ｗ，１００Ｖをスポット溶接するための溶接部１０１がそれぞれ形成されている。 The first to third metal fittings 97U to 97V are band plates having a “C” shape in a top view, and project outward in the radial direction at a plurality (4) of both end portions and point symmetrical positions of the both end portions. A protruding piece 98 is formed. A fusing terminal 99 is formed at the tip of each protruding piece 98. The fusing terminal 99 is once bent downward, folded back upward, and further bent outward.
A welding portion 101 for spot welding the power supply line 100U is formed at the base of the protruding piece 98 at one end of the first metal fitting 97U, and is opposite to the first metal fitting 97U of the second and third metal fittings 97W, 97U. Welded portions 101 for spot welding the power supply wires 100W and 100V are also formed at the bases of the protruding pieces 98 at the end portions on the side.
　第１～第３金具９７Ｕ～９７Ｖは、短絡部材４６内では、上から第１金具９７Ｕ，第２金具９７Ｗ，第３金具９７Ｖの順で且つ周方向に所定角度ずつ位相がずれた状態で配置されている。第１～第３金具９７Ｕ～９７Ｖがインサート成形された短絡部材４６の外周面から、各ヒュージング端子９９が、互いに非接触状態で、且つ周方向略等間隔で突出している。
　短絡部材４６には、複数（３箇所）の透孔１０２が、周方向の一部分に所定間隔を置いて片寄せた状態で形成されている。各透孔１０２において、第１～第３金具９７Ｕ～９７Ｖの対応する溶接部１０１が露出している。各溶接部１０１には、対応する電源線１００Ｕ～１００Ｖがスポット溶接される。第１金具９７Ｕの溶接部１０１と第３金具９７Ｖの溶接部１０１との間には、電源線１００Ｕ～１００Ｖを外側へ引き出すための切り欠き１０３が、短絡部材４６の下側のみがつながった状態で形成されている。
　又、短絡部材４６の内周で点対称位置には、センサ回路基板４７を取り付けるための取付ボス１０５を備えた複数（一対）の支持片１０４が中心側へ向けて突設されている。各支持片１０４の間であって短絡部材４６の内周には、センサ回路基板４７の外周を支持する複数の受け片１０６（図１３）が、中心側へ向けて突設されている。 The first to third metal fittings 97U to 97V are arranged in the short-circuit member 46 in the order of the first metal fitting 97U, the second metal fitting 97W, and the third metal fitting 97V from the top and with a phase shift of a predetermined angle in the circumferential direction. Has been done. The fusing terminals 99 project from the outer peripheral surface of the short-circuit member 46 in which the first to third metal fittings 97U to 97V are insert-molded, in a non-contact state with each other and at substantially equal intervals in the circumferential direction.
A plurality of (three places) through holes 102 are formed in the short-circuit member 46 in a state in which they are biased to a part in the circumferential direction at predetermined intervals. In each through hole 102, the corresponding welded portion 101 of the first to third metal fittings 97U to 97V is exposed. A corresponding power supply line 100U to 100V is spot-welded to each welding portion 101. A state in which a cutout 103 for pulling out the power supply lines 100U to 100V is connected between the welded portion 101 of the first metal fitting 97U and the welded portion 101 of the third metal fitting 97V, and only the lower side of the short-circuit member 46 is connected. Is formed by.
Further, a plurality of (a pair of) supporting pieces 104 provided with mounting bosses 105 for mounting the sensor circuit board 47 are provided at the point symmetrical positions on the inner circumference of the short-circuit member 46 so as to protrude toward the center side. A plurality of receiving pieces 106 (FIG. 13) supporting the outer circumference of the sensor circuit board 47 are provided between the support pieces 104 and on the inner circumference of the short-circuit member 46 so as to protrude toward the center.
　センサ回路基板４７は、短絡部材４６の内側で円弧状に周回する帯板状であり、周方向の両端には、各支持片の取付ボス１０５が嵌合する嵌合孔１０７が形成されている。センサ回路基板４７は、各嵌合孔１０７に取付ボス１０５が嵌合し、又受け片１０６に外周が支持されることで、短絡部材４６の内周側で保持される。
　センサ回路基板４７の裏面には、ロータ２４の永久磁石５９の磁界を検出するホール素子等の複数（３個）の回転検出素子１０８（図１１）が搭載されている。
　センサ回路基板４７に接続される複数（５本）の信号線１０９と電源線１００Ｕ～１００Ｖとは、短絡部材４６の切り欠き１０３から外側へ引き出される。この引き出し位置は、モータケース２２の上ケース２６に設けられたスリット７２に対応している。 The sensor circuit board 47 is a strip plate shape that circulates in an arc shape inside the short-circuit member 46, and fitting holes 107 into which the mounting bosses 105 of the respective support pieces are fitted are formed at both ends in the circumferential direction. .. The sensor circuit board 47 is held on the inner peripheral side of the short-circuit member 46 by fitting the mounting boss 105 into each fitting hole 107 and supporting the outer circumference by the receiving piece 106.
A plurality of (three) rotation detecting elements 108 (FIG. 11) such as Hall elements that detect the magnetic field of the permanent magnet 59 of the rotor 24 are mounted on the back surface of the sensor circuit board 47.
A plurality of (five) signal lines 109 and power supply lines 100U to 100V connected to the sensor circuit board 47 are drawn out from the cutout 103 of the short-circuit member 46. This pulled-out position corresponds to the slit 72 provided in the upper case 26 of the motor case 22.
　短絡部材４６は、センサ回路基板４７と共にステータ２３へ組み付けられる。このとき、外周の５つの嵌合ボス９５が、上インシュレータ４２上面の止めボス８９に嵌合する。又、各止めボス８９に、上方からネジ９１（図１０）が入れられる。更に、３つのリブ９６の先端が、ステータコア４０の各溝５３に係合する。又、各ヒュージング端子９９が、上インシュレータ４２の各端子保持部８５に保持される。
　特に、リブ９６は、複数（３）箇所で溝５３に係合して食いつくため、短絡部材４６を安定支持するアンカーとして機能する。
　電源線１００Ｕ～１００Ｖ及び信号線１０９は、上ケース２６のスリット７２から、スリット７２に装着したスリーブ上のパッキン８２（図３）を介して、外部へ引き出される。 The short-circuit member 46 is attached to the stator 23 together with the sensor circuit board 47. At this time, the five fitting bosses 95 on the outer circumference fit into the stopper bosses 89 on the upper surface of the upper insulator 42. Further, the screws 91 (FIG. 10) are inserted into the respective stop bosses 89 from above. Further, the tips of the three ribs 96 engage with the grooves 53 of the stator core 40. Further, each fusing terminal 99 is held by each terminal holding portion 85 of the upper insulator 42.
In particular, the rib 96 engages with and bites into the groove 53 at a plurality of (3) locations, and thus functions as an anchor that stably supports the short-circuit member 46.
The power supply lines 100U to 100V and the signal line 109 are drawn out from the slit 72 of the upper case 26 through the packing 82 (FIG. 3) on the sleeve attached to the slit 72.
　各コイル４５は、３つの巻線ノズルを用いて、図１５に示されるように巻かれる。
　即ち、１２０°間隔に位置する３つのティース４１を始めとして、対応する巻線ノズルから繰り出されるワイヤ１１５Ａ，１１５Ｂ，１１５Ｃが同時に巻かれ始め、そのままステータ２３の周方向に隣接する４つのティース４１へそれぞれ順番に巻かれて、合計１２個のコイル４５が形成される。
　ワイヤ１１５Ａでは、始めのティース４１に対応するヒュージング端子９９に始端１１６Ａが係止された後、右回り方向へ隣接するティース４１にコイル４５が順次形成される。このときの巻回方向は、ティース４１に向かって反時計回り方向である。又、各コイル４５の形成後の渡り線１１７Ａは、上インシュレータ４２（結線側）へ戻されて、隣接する一対のティース４１の間のヒュージング端子９９に係止される。
　そして、４つ目のコイル４５が形成されると、図１１にも示されるように、ワイヤ１１５Ａは、一旦下インシュレータ４３側（反結線側）に引き出され、巻回しているティース４１の根元のガイド壁９０に外側から巻かれた後、再び上インシュレータ４２側へ戻されて、隣接する別のワイヤ１１５Ｂの始端１１６Ｂが係止されるヒュージング端子９９に係止され、当該係止部分が終端１１８Ａとされる。終端１１８Ａの向きは、隣接する別のワイヤ１１５Ｂの始端１１６Ｂの向きと合わせられ、図１５の丸で囲まれた部分において同時にカット可能である。
　ワイヤ１１５Ｂ，１１５Ｃは、配置を除きワイヤ１１５Ａと同様に巻回される。ワイヤ１１５Ｂの終端１１８Ｂの向きはワイヤ１１５Ｃの始端１１６Ｃの向きと合わせられ、ワイヤ１１５Ｃの終端１１８Ｃの向きはワイヤ１１５Ａの始端１１６Ａの向きと合わせられる。 Each coil 45 is wound using three winding nozzles as shown in FIG.
That is, starting from the three teeth 41 located at 120° intervals, the wires 115A, 115B, 115C fed from the corresponding winding nozzles start to be wound at the same time, and then directly to the four teeth 41 adjacent to the stator 23 in the circumferential direction. Each of them is wound in order to form a total of 12 coils 45.
In the wire 115A, after the starting end 116A is locked to the fusing terminal 99 corresponding to the first tooth 41, the coil 45 is sequentially formed on the tooth 41 adjacent in the clockwise direction. The winding direction at this time is a counterclockwise direction toward the tooth 41. In addition, the crossover 117A after the formation of each coil 45 is returned to the upper insulator 42 (connection side) and locked to the fusing terminal 99 between the pair of adjacent teeth 41.
Then, when the fourth coil 45 is formed, as shown in FIG. 11, the wire 115A is once pulled out to the side of the lower insulator 43 (the side opposite to the wire connection side), and at the base of the wound tooth 41. After being wound on the guide wall 90 from the outside, it is returned to the upper insulator 42 side again, and the starting end 116B of another adjacent wire 115B is locked to the fusing terminal 99 to be locked, and the locking portion ends. 118A. The direction of the terminal end 118A is aligned with the direction of the starting end 116B of another adjacent wire 115B, and can be simultaneously cut in the circled portion of FIG.
The wires 115B and 115C are wound in the same manner as the wire 115A except for the arrangement. The orientation of the terminal end 118B of the wire 115B is aligned with the orientation of the starting end 116C of the wire 115C, and the orientation of the terminal end 118C of the wire 115C is aligned with the orientation of the starting end 116A of the wire 115A.
　短絡部材４６の第１～第３金具９７Ｕ～９７Ｖは、周方向ではコイル４５の１つ分ずつ位相がずれた状態で配置されており、図１６に示されるように、隣接するコイル４５間の所定の渡り線１１７Ａ～１１７Ｃを、間に３つのコイル４５を置いてそれぞれヒュージングしている。図１６では、第１～第３金具９７Ｕ～９７Ｖがヒュージングする渡り線１１７Ａ～１１７Ｃの区別を容易にするため、第１金具９７Ｕにハッチングが付され、第２金具９７Ｗに網掛けが付され、第３金具９７Ｖに点描が付されている。
　周方向に連続して隣接する３つのコイル４５は、各相の第１～第３金具９７Ｕ～９７Ｖによって、Ｕ（Ｗ－Ｕ），Ｖ（Ｕ－Ｖ），Ｗ（Ｕ－Ｗ）としてデルタ結線される。そして、これが第１～第３金具９７Ｕ～９７Ｖによって４セット順番に並設されるため、ここでの三相回路は、図１７に示されるものとなる。この三相回路は、Ｕ，Ｖ，Ｗの各相４つのコイルＵ１～Ｕ４，Ｖ１～Ｖ４，Ｗ１～Ｗ４がそれぞれ並列に接続されたデルタ結線と等価である。 The first to third metal fittings 97U to 97V of the short-circuit member 46 are arranged in a state in which the coils 45 are out of phase with each other in the circumferential direction, and as shown in FIG. The predetermined crossovers 117A to 117C are each fusing with three coils 45 interposed therebetween. In FIG. 16, the first metal fitting 97U is hatched and the second metal fitting 97W is shaded in order to easily distinguish the crossovers 117A to 117C to which the first to third metal fittings 97U to 97V are fused. , 3rd metal fitting 97V is dotted.
The three coils 45 that are continuously adjacent to each other in the circumferential direction are delta as U (WU), V (UV), and W (UW) by the first to third metal fittings 97U to 97V of each phase. Wired. Then, since these are arranged in parallel in the order of 4 sets by the first to third metal fittings 97U to 97V, the three-phase circuit here is as shown in FIG. This three-phase circuit is equivalent to a delta connection in which four coils U1 to U4, V1 to V4, and W1 to W4 of U, V, and W phases are connected in parallel.
　次いで、このような芝刈機１の動作例が説明される。
　充電されたバッテリパック１３が２個バッテリ装着部１２に装着された状態で、作業者によりロックオフボタン９が押されたうえでスイッチレバー８の引き操作がなされると、メインスイッチがオンとなり、コントローラ１５の制御回路基板にオン信号が伝達される。
　オン信号を受信した制御回路基板のマイコンは、センサ回路基板４７の回転検出素子１０８から得られる検出信号によってロータ２４の回転状態を取得し、取得した回転状態に応じて各スイッチング素子のオンオフを制御し、ステータ５０の各相のコイル４５に対し順番に励磁電流を流すことで、ロータ２４を回転させる。
　ロータ２４の回転により、回転軸２５が回転し、スピンドル１７を介して刈刃２０に回転力が付与される。よって、芝刈機１は、上下方向の軸周りで水平（地面と平行）に回転された刈刃２０により、芝を刈る動作を行う（ロータリー刃型）。
　作業者は、ハンドル４を介してベース２を前方へ押すことで、車輪５を介して芝刈機１を芝の生えた地面上で走行させ、芝を切り揃えて芝面を整える。刈られた芝は、集草カゴ７に集められる。 Next, an operation example of such a lawnmower 1 will be described.
When the operator pushes the lock-off button 9 and then pulls the switch lever 8 with two charged battery packs 13 mounted in the battery mounting portion 12, the main switch is turned on, The ON signal is transmitted to the control circuit board of the controller 15.
The microcomputer of the control circuit board that has received the ON signal acquires the rotation state of the rotor 24 based on the detection signal obtained from the rotation detection element 108 of the sensor circuit board 47, and controls ON/OFF of each switching element according to the acquired rotation state. Then, the rotor 24 is rotated by sequentially supplying an exciting current to the coils 45 of the respective phases of the stator 50.
Due to the rotation of the rotor 24, the rotary shaft 25 rotates, and a rotational force is applied to the cutting blade 20 via the spindle 17. Therefore, the lawnmower 1 performs an operation of mowing lawn by the cutting blade 20 that is rotated horizontally (parallel to the ground) around the vertical axis (rotary blade type).
The operator pushes the base 2 forward through the handle 4 to cause the lawnmower 1 to travel on the lawn-grown ground through the wheels 5 and trims the lawn to prepare the lawn surface. The mowed grass is collected in the grass collection basket 7.
　このとき、ブラシレスモータ２１では、ステータ２３が、回り止め部としての突条４８Ａ，４８Ａ，４８Ｂを貫通するネジ８１によって、ベース２８に組み付けられるモータケース２２に対して回り止めされるので、公差による影響が小さく、精度の良い回り止めが可能となる。又、ブラシレスモータ２１の固定において、高い強度が得られる。特に、ネジ８１がステータコア４０を直接貫通するため、ステータコア４０の外側で上ケース２６及び下ケース２７をネジで連結する構造に比べて、撓みが生じ難くなっている。
　更に、コイル４５を形成するワイヤ１１５Ａ～１１５Ｃは、互いに交差しないので、接触による削れが生じ難くなり、耐久性が高まる。
　又、ロータ２４では、回転軸２５の外周に綾目ローレット２５ａが設けられているので、樹脂５６の食いつきが良くなって回転方向及び軸方向のスリップトルクが高くなり、刈刃２０の回転によって負荷が大きくなっても回転軸２５とロータコア５５との一体性は保たれる。 At this time, in the brushless motor 21, the stator 23 is prevented from rotating with respect to the motor case 22 assembled to the base 28 by the screw 81 penetrating the protrusions 48A, 48A, 48B serving as a rotation preventing portion, and therefore, it depends on the tolerance. The influence is small, and the rotation can be stopped with high accuracy. Further, when fixing the brushless motor 21, high strength can be obtained. In particular, since the screw 81 directly penetrates the stator core 40, bending is less likely to occur as compared with the structure in which the upper case 26 and the lower case 27 are connected to each other outside the stator core 40 by a screw.
Further, since the wires 115A to 115C forming the coil 45 do not intersect with each other, abrasion due to contact is less likely to occur and durability is improved.
Further, in the rotor 24, since the twill knurls 25a are provided on the outer periphery of the rotating shaft 25, the biting of the resin 56 is improved, the slip torque in the rotation direction and the axial direction is increased, and the rotation of the cutting blade 20 causes a load. Even if the value becomes large, the integrity of the rotary shaft 25 and the rotor core 55 is maintained.
　更に、回転軸２５の回転により遠心ファン３５が回転して周囲の空気を径方向外方に押し出すことで、本体３外側から、その隙間及びモータカバー２９の隙間並びにモータユニット１６外部を通り、遠心ファン３５及びその径方向外方の本体ハウジング１０の排気口に至る空気の流れ（風）が形成される。
　この風により、芝刈機１の内部機構が冷却される。 Further, the rotation of the rotating shaft 25 causes the centrifugal fan 35 to rotate and push out the surrounding air radially outward, so that the centrifugal force is passed from the outside of the main body 3 through the gap, the gap of the motor cover 29, and the outside of the motor unit 16 to the centrifugal force. A flow of air (wind) reaching the fan 35 and the exhaust port of the main body housing 10 radially outside thereof is formed.
The wind cools the internal mechanism of the lawnmower 1.
　又、ブラシレスモータ２１のステータコア４０では、各ティース４１に巻かれたコイル４５を覆うコイル外側樹脂３６が設けられているので、各コイル４５への通電を始めとするブラシレスモータ２１の作動により発生した熱は、コイル外側樹脂３６に伝達する。コイル外側樹脂３６が受け取った熱は、直接接触するステータコア４０を介して、金属製のモータケース２２に伝達し、モータケース２２の各フィン６５等から放散される。ブラシレスモータ２１の発熱は、コイル外側樹脂３６がない場合に比べ、モータケース２２に伝達する熱量がより多くなり、より効率的に放散される。
　図２３（Ａ）にも示されるように、各フィン６５には、上方からの風Ｗがテーパ状の斜面に当たるので、モータケース２２ひいてはブラシレスモータ２１が効率良く冷却される。 Further, in the stator core 40 of the brushless motor 21, since the coil outer resin 36 covering the coils 45 wound around the teeth 41 is provided, it is generated by the operation of the brushless motor 21 including energization of the coils 45. The heat is transferred to the coil outside resin 36. The heat received by the coil outer side resin 36 is transmitted to the metal motor case 22 through the stator core 40 that is in direct contact therewith, and is dissipated from the fins 65 and the like of the motor case 22. The heat generated by the brushless motor 21 has a larger amount of heat transferred to the motor case 22 and is dissipated more efficiently than when the coil outer resin 36 is not provided.
As shown in FIG. 23(A), the wind W from above hits the tapered slopes of the fins 65, so that the motor case 22 and thus the brushless motor 21 are efficiently cooled.
　続いて、かような芝刈機１が奏し得る作用効果が説明される。
　芝刈機１は、モータケース２２に保持され、ステータコア４０、コイル４５、及びステータコア４０とコイル４５との間に介在する絶縁部４４を有するステータ２３、並びに、ステータ２３の内側に配置され、回転軸２５を有するロータ２４を備えたブラシレスモータ２１と、回転軸２５により駆動するスピンドル１７と、を備えており、ステータ２３は、各コイル４５の外側並びにステータコア４０に接触する樹脂であるコイル外側樹脂３６を有する。よって、ブラシレスモータ２１がコイル外側樹脂３６、ステータコア４０及びモータケース２２により効率良く放熱され、放熱性に優れたブラシレスモータ２１を備えた芝刈機１が提供される。
　又、コイル４５は、複数設けられており、コイル外側樹脂３６は、複数の各コイル４５の外側に共通して接触するよう一連に配置されている。よって、コイル外側樹脂３６がより形成し易い。
　更に、モータケース２２は、非磁性体の金属製である。よって、コイル外側樹脂３６がステータコア４０を介して熱伝導性に優れた非磁性体の金属に熱結合され、より一層放熱性が高められる。 Next, the operational effects that the lawnmower 1 can play will be described.
The lawn mower 1 is held by the motor case 22, and is provided with a stator core 40, a coil 45, and a stator 23 having an insulating portion 44 interposed between the stator core 40 and the coil 45, and is arranged inside the stator 23. A brushless motor 21 having a rotor 24 having 25 and a spindle 17 driven by a rotating shaft 25 are provided. The stator 23 has a coil outside resin 36 that is a resin that contacts the outside of each coil 45 and the stator core 40. Have. Therefore, the brushless motor 21 is efficiently radiated by the coil outside resin 36, the stator core 40, and the motor case 22, and the lawnmower 1 including the brushless motor 21 having excellent heat radiation is provided.
A plurality of coils 45 are provided, and the coil outside resin 36 is arranged in series so as to commonly contact the outside of each of the plurality of coils 45. Therefore, the coil outer side resin 36 is easier to form.
Further, the motor case 22 is made of non-magnetic metal. Therefore, the coil outside resin 36 is thermally coupled to the non-magnetic metal having excellent thermal conductivity via the stator core 40, and the heat dissipation is further enhanced.
［第１形態の変更例］
　尚、本発明は上記第１形態及びその変更例に限定されず、例えば次のような変更が更に適宜施される。
　フィン６５は、モータケース２２と別体で用意されてモータケース２２に固定されても良い。ステータコア４０に放熱用のフィンが設けられても良い。この場合、モータケース２２又はそのフィン６５が省略されても良い。
　モータケース２２は、上下に分割されないケースであっても良いし、３分割以上とされていても良いし、省略されても良い。
　ティース４１及びコイル４５は、１１個以下あるいは１３個以上であっても良い。コイル４５の回路は、各相３並列以下あるいは５並列以上のデルタ結線であっても良いし、直列接続を含むデルタ結線であっても良いし、スター結線であっても良い。 [Modification Example of First Mode]
It should be noted that the present invention is not limited to the above-described first embodiment and its modified examples, and the following modifications may be made as appropriate.
The fins 65 may be prepared separately from the motor case 22 and fixed to the motor case 22. Fins for heat dissipation may be provided on the stator core 40. In this case, the motor case 22 or the fin 65 thereof may be omitted.
The motor case 22 may not be divided into upper and lower parts, may be divided into three or more parts, or may be omitted.
The teeth 41 and the coils 45 may be 11 or less or 13 or more. The circuit of the coil 45 may be a delta connection of 3 parallels or less or 5 parallels or more for each phase, a delta connection including series connection, or a star connection.
　又、ブラシレスモータ２１の放熱性の向上を目的として、フィン６５の形成と共に、あるいはフィン６５の形成に代えて、次に示す事項の少なくとも何れかが施されても良い。
　上インシュレータ４２、下インシュレータ４３、及び絶縁部４４の少なくとも何れかが、通常の樹脂の熱伝導率（０．３Ｗ／ｍ・Ｋ（ワット毎メートル毎ケルビン））より高い熱伝導率（例えば４．７，１３あるいは２４Ｗ／ｍ・Ｋ）を有する高熱伝導性樹脂で形成されても良い。
　コイル４５とステータコア４０又はモータケース２２との間、及びステータコア４０とモータケース２２との間の少なくとも一方に、高熱伝導性の接着剤又は流動性シリコン樹脂が塗布されたり、高熱伝導性シートが介装されたりしても良い。
　モータケース２２の内壁、及び本体ハウジング１０のモータケース２２に隣接する部分の少なくとも一方に、フィンが設けられても良い。 Further, for the purpose of improving the heat dissipation of the brushless motor 21, at least one of the following items may be performed together with the formation of the fins 65 or in place of the formation of the fins 65.
At least one of the upper insulator 42, the lower insulator 43, and the insulating portion 44 has a higher thermal conductivity (for example, 4. W/m·K (watt/meter/kelvin)) than that of a normal resin. It may be formed of a high thermal conductive resin having 7, 13 or 24 W/m·K).
At least one of the coil 45 and the stator core 40 or the motor case 22 and the stator core 40 and the motor case 22 is coated with a highly heat-conductive adhesive or a fluid silicone resin, or a high-heat conductive sheet is interposed. You may be dressed.
Fins may be provided on at least one of the inner wall of the motor case 22 and the portion of the main body housing 10 adjacent to the motor case 22.
　バッテリ装着部１２に代えて電源コードが設けられて商用電源駆動とされたり、各種のネジ及びネジ孔等の数が増減されたり、各種の係合部、接続部、ネジ止め部、保持部、及び取り付け部の少なくとも何れかが他の構造あるいは形式のものに変更されたり、マイコン及びスイッチング素子の少なくとも何れかがセンサ回路基板４７に搭載されたり、各種のケース及びハウジングの少なくとも何れかの材質が樹脂、アルミニウム（アルミニウム合金を含む）等の金属、及びこれらの複合体等に変更されたりする等、各種部材、部分の個数、設置の有無、材質、配置、構造、及び形式の少なくとも何れか等は、適宜変更されても良い。
　更に、刈刃２０が左右方向を軸方向としてその周りで回転する円筒状のリール刃であるリール刃型を始めとする他の形式の芝刈機、ひいては他の電動作業機等に、本発明が適用されても良い。例えば、本発明は、高出力の製品に適用され、電動工具の内のアングルドリル、ハンマ、ハンマドリル、マルノコ、レシプロソーあるいはグラインダ、又は園芸工具の内のチェーンソー、ヘッジトリマ、ブロワ、草刈機若しくは生垣バリカン、あるいはエアを動力とするエア工具用の空気圧縮機に適用される。エア工具用の空気圧縮機のように、作業を行う作業機を作動させるための電動機器は、電動作業機に含められる。
　本発明の上述の効果は、特に、比較的大型のブラシレスモータ（ステータコア１２０の外径（直径）が例えば８０ミリメートル以上）において顕著に発揮される。 A power cord is provided in place of the battery mounting portion 12 to drive a commercial power source, the number of various screws and screw holes is increased or decreased, various engaging portions, connecting portions, screw fastening portions, holding portions, And/or at least one of the mounting portions is changed to another structure or type, at least one of the microcomputer and the switching element is mounted on the sensor circuit board 47, and at least one of various cases and housings is made of material. At least one of various members, number of parts, presence/absence of installation, material, arrangement, structure, type, etc., such as resin, metal such as aluminum (including aluminum alloy), and composites thereof, etc. May be changed as appropriate.
Further, the present invention can be applied to other types of lawn mowers such as a reel blade type which is a cylindrical reel blade in which the cutting blade 20 rotates around the left-right direction as an axial direction, and thus to other electric working machines. May be applied. For example, the present invention is applied to high-power products, such as angle drills, hammers, hammer drills, marunoco, reciprocating saws or grinders in power tools, or chainsaws in gardening tools, hedge trimmers, blowers, mowers or hedge clippers, Alternatively, it is applied to an air compressor for air tools that uses air as a power source. An electric work machine, such as an air compressor for an air tool, for operating a work machine that performs work is included in the electric work machine.
The above-described effects of the present invention are particularly remarkable in a relatively large brushless motor (the outer diameter (diameter) of the stator core 120 is, for example, 80 mm or more).
［第２形態］
　本発明の第２形態は、コイル外側樹脂の形態を除き、第１形態と同様に成る。かような第２形態は、コイル外側樹脂の形態に応じ、第２－１形態から第２－３形態まである。第１形態と同様に成る部材及び部分については、同一の符号が付され、適宜説明が省略される。 [Second form]
The second form of the present invention is the same as the first form except for the form of the resin outside the coil. Such a second form includes a 2-1 form to a 2-3 form depending on the form of the resin on the outside of the coil. Members and portions similar to those in the first embodiment are designated by the same reference numerals, and description thereof will be appropriately omitted.
［第２－１形態］
　図１８は、本発明の第２－１形態に係る芝刈機の図６に相当する説明図である。
　当該芝刈機のブラシレスモータ２２１Ａにおけるステータ２２３Ａのコイル外側樹脂２３６Ａは、１２個の各コイル４５の外側に個別に接触するように、１２箇所配置された個別部分と、これらの根元（径方向外側の部分）をつなぐ筒状の基礎部分とを備えている。基礎部分は、ステータコア４０の内面を覆う。コイル外側樹脂２３６Ａにおける隣接するコイル４５の間の部分には、径方向に延びる溝Ｐがそれぞれ形成される。 [Form 2-1]
FIG. 18 is an explanatory diagram corresponding to FIG. 6 of the lawnmower according to the 2-1st mode of the present invention.
The coil outer resin 236A of the stator 223A in the brushless motor 221A of the lawn mower is arranged at 12 positions so that the coil outside resin 236A individually contacts the outside of each of the 12 coils 45. And a tubular base part for connecting the parts). The base portion covers the inner surface of the stator core 40. Grooves P extending in the radial direction are formed in portions of the coil outside resin 236A between the adjacent coils 45, respectively.
　第２－１形態に係る芝刈機は、モータケース２２に保持され、ステータコア４０、コイル４５、及びステータコア４０とコイル４５との間に介在する絶縁部４４を有するステータ２２３Ａ、並びに、ステータ２２３Ａの内側に配置され、回転軸２５を有するロータ２４を備えたブラシレスモータ２２１Ａと、回転軸２５により駆動するスピンドル１７と、を備えており、ステータ２２３Ａは、各コイル４５の外側及びステータコア４０に接触する樹脂である各コイル外側樹脂２３６Ａを有する。よって、ブラシレスモータ２２１Ａが各コイル外側樹脂２３６Ａ、ステータコア４０及びモータケース２２により効率良く放熱され、放熱性に優れたブラシレスモータ２２１Ａを備えた芝刈機が提供される。
　又、コイル４５は、１２個設けられており、各コイル外側樹脂２３６Ａは、１２個の各コイル４５の間に形成された溝Ｐを有している。よって、各コイル４５における熱の伝達が、各コイル外側樹脂２３６Ａによりステータコア４０ないしモータケース２２へ方向付けされて、当該熱の伝達性が高められる。 The lawn mower according to the 2-1st mode is held inside the motor case 22, has a stator core 40, a coil 45, and a stator 223A having an insulating portion 44 interposed between the stator core 40 and the coil 45, and the inside of the stator 223A. And a spindle 17 that is driven by the rotating shaft 25, and the stator 223A is a resin that contacts the outside of each coil 45 and the stator core 40. 236A of each coil outer side resin. Therefore, the brushless motor 221A is efficiently radiated by the coil outside resin 236A, the stator core 40 and the motor case 22, and a lawn mower provided with the brushless motor 221A having excellent heat radiation is provided.
Further, twelve coils 45 are provided, and each coil outside resin 236A has a groove P formed between twelve coils 45. Therefore, the heat transfer in each coil 45 is directed to the stator core 40 or the motor case 22 by each coil outer side resin 236A, and the heat transfer property is enhanced.
［第２－２形態］
　図１９は、本発明の第２－２形態に係る芝刈機の図６に相当する説明図である。
　当該芝刈機のブラシレスモータ２２１Ｂにおけるステータ２２３Ｂのコイル外側樹脂２３６Ｂは、複数の各コイル４５の外側に共通して接触するよう一連に配置されていると共に、各コイル４５の上方及び下方の部分に、上方又は下方へ径方向に延びる板状に突出するフィン２３７を有している。 [Type 2-2]
FIG. 19 is an explanatory diagram corresponding to FIG. 6 of the lawnmower according to the second to second aspects of the present invention.
The coil outside resin 236B of the stator 223B in the brushless motor 221B of the lawn mower is arranged in series so as to commonly contact the outside of each of the plurality of coils 45, and at the upper and lower portions of each coil 45, It has a fin 237 that projects upward or downward in the shape of a plate that extends in the radial direction.
　第２－２形態に係る芝刈機は、モータケース２２に保持され、ステータコア４０、コイル４５、及びステータコア４０とコイル４５との間に介在する絶縁部４４を有するステータ２２３Ｂ、並びに、ステータ２２３Ｂの内側に配置され、回転軸２５を有するロータ２４を備えたブラシレスモータ２２１Ｂと、回転軸２５により駆動するスピンドル１７と、を備えており、ステータ２２３Ｂは、コイル４５の外側及びステータコア４０に接触する樹脂であるコイル外側樹脂２３６Ｂを有する。よって、ブラシレスモータ２２１Ｂがコイル外側樹脂２３６Ｂ、ステータコア４０及びモータケース２２により効率良く放熱され、放熱性に優れたブラシレスモータ２２１Ｂを備えた芝刈機が提供される。
　又、コイル外側樹脂２３６Ｂは、各フィン２３７を有している。よって、コイル外側樹脂２３６Ｂの表面積が効率的に大きくなり、更にブラシレスモータ２２１Ｂの放熱性が向上する。 The lawn mower according to the second to second aspects includes a stator 223B that is held by the motor case 22, has a stator core 40, a coil 45, and an insulating portion 44 that is interposed between the stator core 40 and the coil 45, and the inside of the stator 223B. And a spindle 17 driven by the rotation shaft 25, and the stator 223B is made of resin that contacts the outside of the coil 45 and the stator core 40. It has a certain coil outside resin 236B. Therefore, the brushless motor 221B is efficiently radiated by the coil outer side resin 236B, the stator core 40 and the motor case 22, and the lawn mower provided with the brushless motor 221B having excellent heat radiation is provided.
The coil outer side resin 236B has each fin 237. Therefore, the surface area of the coil outer side resin 236B is efficiently increased, and the heat dissipation of the brushless motor 221B is further improved.
［第２－３形態］
　図２０は、本発明の第２－３形態に係る芝刈機の図６に相当する説明図である。
　当該芝刈機のブラシレスモータ２２１Ｃにおけるステータ２２３Ｃのコイル外側樹脂２３６Ｃは、１２個の各コイル４５の外側に個別に接触するように、１２箇所配置された個別部分と、これらの根元（径方向外側の部分）をつなぐ筒状の基礎部分とを備えている。コイル外側樹脂２３６Ｃにおける隣接するコイル４５の間の部分には、径方向に延びる溝Ｐがそれぞれ形成される。又、各コイル外側樹脂２３６Ｃにおけるコイル４５の上方及び下方の部分に、上方又は下方へ径方向に延びる板状に突出するフィン２３７が形成されている。 [Type 2-3]
FIG. 20 is an explanatory diagram corresponding to FIG. 6 of the lawnmower according to the second to third aspects of the present invention.
The coil outer side resin 236C of the stator 223C in the brushless motor 221C of the lawn mower is arranged at 12 positions so that the coil outside resin 236C individually contacts the outside of each of the 12 coils 45, and their roots (radial outside). And a tubular base part for connecting the parts). Grooves P extending in the radial direction are formed in portions of the coil outside resin 236C between the adjacent coils 45, respectively. Further, fins 237 projecting in a plate shape extending in the radial direction upward or downward are formed at the portions above and below the coil 45 in each coil outside resin 236C.
　第２－３形態に係る芝刈機は、モータケース２２に保持され、ステータコア４０、コイル４５、及びステータコア４０とコイル４５との間に介在する絶縁部４４を有するステータ２２３Ｃ、並びに、ステータ２２３Ｃの内側に配置され、回転軸２５を有するロータ２４を備えたブラシレスモータ２２１Ｃと、回転軸２５により駆動するスピンドル１７と、を備えており、ステータ２２３Ｃは、コイル４５の外側及びステータコア４０に接触する樹脂である各コイル外側樹脂２３６Ｃを有する。よって、ブラシレスモータ２２１Ｃがコイル外側樹脂２３６Ｃ、ステータコア４０及びモータケース２２により効率良く放熱され、放熱性に優れたブラシレスモータ２２１Ｃを備えた芝刈機が提供される。
　又、コイル４５は、１２個設けられており、各コイル外側樹脂２３６Ｃは、１２個の各コイル４５の間に形成された溝Ｐを有している。よって、各コイル４５における熱の伝達が、各コイル外側樹脂２３６Ｃによりステータコア４０ないしモータケース２２へ方向付けされて、当該熱の伝達性が高められる。
　更に、各コイル外側樹脂２３６Ｃは、フィン２３７を有している。よって、コイル外側樹脂２３６Ｃの表面積が効率的に大きくなり、更にブラシレスモータ２２１Ｃの放熱性が向上する。 The lawn mower according to the second to third aspects is a stator 223C that is held by the motor case 22, has a stator core 40, a coil 45, and an insulating portion 44 that is interposed between the stator core 40 and the coil 45, and the inside of the stator 223C. And a spindle 17 driven by the rotating shaft 25. The stator 223C is made of resin that contacts the outside of the coil 45 and the stator core 40. There is a certain coil outside resin 236C. Therefore, the brushless motor 221C is efficiently radiated by the coil outer side resin 236C, the stator core 40 and the motor case 22, and a lawn mower provided with the brushless motor 221C having excellent heat radiation is provided.
Further, twelve coils 45 are provided, and each coil outside resin 236C has a groove P formed between twelve coils 45. Therefore, the heat transfer in each coil 45 is directed to the stator core 40 or the motor case 22 by each coil outer resin 236C, and the heat transfer property is enhanced.
Further, each coil outside resin 236C has a fin 237. Therefore, the surface area of the coil outside resin 236C is efficiently increased, and the heat dissipation of the brushless motor 221C is further improved.
［第２形態の変更例］
　尚、上記第２形態は、第１形態と同様の変更例を適宜有する。
　又、第２－１，２－３形態において、各コイル外側樹脂２３６Ａ，２３６Ｃの根元をつなぐ基礎部分の少なくとも一部が省略されても良い。基礎部分の全部が省略された場合、コイル外側樹脂２３６Ａ，２３６Ｃは、１２個の各コイル４５の外側に個別に接触するように、１２箇所配置される。又、各コイル外側樹脂２３６Ａ，２３６Ｃ（個別部分）は、複数のコイルにまたがっていても良い。各コイル外側樹脂２３６Ａ，２３６Ｃの基礎部分は、ステータコア４０の内面を覆わなくても良い。
　更に、第２－２，２－３形態において、フィン２３７は、コイル外側樹脂２３６Ｂ，２３６Ｃの片面側のみに形成されても良いし、コイル４５からずれるように配置されても良い。又、フィン２３７が金属板とされ、コイル外側樹脂２３６Ｂ，２３６Ｃに結合されても良い。更に、フィン２３７に代えて、あるいはフィン２３７と共に、コイル外側樹脂２３６Ｂ，２３６Ｃの片面に接触する金属円板が、ステータコア４０及びモータケース２２の少なくとも一方に結合されるようにしても良い。 [Modification Example of Second Mode]
In addition, the said 2nd form has the same modification as the 1st form suitably.
In addition, in the 2-1 and 2-3 forms, at least a part of the base portion connecting the roots of the coil outer side resins 236A and 236C may be omitted. When all of the base portions are omitted, the coil outside resins 236A and 236C are arranged at 12 positions so as to individually contact the outside of each of the 12 coils 45. Moreover, each coil outer side resin 236A, 236C (individual part) may straddle a plurality of coils. The base portion of each coil outer side resin 236A, 236C may not cover the inner surface of the stator core 40.
Furthermore, in the 2nd, 2nd and 3rd configurations, the fin 237 may be formed only on one surface side of the coil outer side resin 236B, 236C, or may be arranged so as to be displaced from the coil 45. Alternatively, the fin 237 may be a metal plate and may be coupled to the coil outside resins 236B and 236C. Further, instead of the fin 237 or together with the fin 237, a metal disk contacting one surface of the coil outer side resin 236B, 236C may be coupled to at least one of the stator core 40 and the motor case 22.
［第３形態］
　本発明の第３形態は、コイル外側樹脂及びモータケースの形態を除き、第１形態と同様に成る。かような第３形態は、モータケースの形態に応じ、第３－１形態から第３－２形態まである。第１形態と同様に成る部材及び部分については、同一の符号が付され、適宜説明が省略される。 [Third mode]
The third mode of the present invention is the same as the first mode except for the resin outside the coil and the motor case. Such a third form includes a 3-1 form and a 3-2 form depending on the form of the motor case. Members and portions similar to those in the first embodiment are designated by the same reference numerals, and description thereof will be appropriately omitted.
［第３－１形態］
　図２１（Ａ）は、本発明の第３－１形態に係る芝刈機の図５相当図であって、コイル外側樹脂が示されないものである。図２１（Ｂ）は、本発明の第３－１形態に係る芝刈機の図５相当図であって、コイル外側樹脂の端面がハッチングで示されるものである。
　当該芝刈機のモータユニット３１６Ａのブラシレスモータ３２１Ａにおけるステータ３２３Ａのコイル外側樹脂３３６Ａは、円筒状であって、複数の各コイル４５の外側に共通して接触するよう一連に配置されており、モータケース３２２Ａにおける上ケース３２６Ａの上壁下面から下ケース３２７Ａの下壁上面までにわたっている。コイル外側樹脂３３６Ａは、上ケース３２６Ａの周壁内面及び下ケース３２７Ａの周壁内面に接触している。コイル外側樹脂３３６Ａは、モータユニット３１６Ａ組立時におけるステータ２２３Ａの組立後ロータ２４の組み付け前に、ステータ２２３Ａに一体成形される。コイル外側樹脂３３６Ａは、ステータ３２３Ａにおける全ての電材（電気的に露出しているもの、ここでは各コイル４５，ガイド壁９０に巻かれたワイヤ部分，渡り線１１７Ａ～１１７Ｃ及びセンサ回路基板４７，並びにヒュージング端子９９及び溶接部１０１を含む短絡部材４６）を覆う。
　又、モータケース３２２Ａにおける上ケース３２６Ａと下ケース３２７Ａの間であって、ステータコア４０の径方向外側の部分には、リング状の高熱伝導体３３８が配置されている。高熱伝導体３３８は、ここではシリコン樹脂製であり、樹脂としては高い熱伝導性を有している。高熱伝導体３３８は、ステータコア４０並びに上ケース３２６Ａ及び下ケース３２７Ａに接触し、上ケース３２６Ａの外面及び下ケース３２７Ａの外面と連続する外面を有していて、モータケース３２２Ａにおける上ケース３２６Ａと下ケース３２７Ａの段差を埋めるものとなっている。 [Form 3-1]
FIG. 21(A) is a view corresponding to FIG. 5 of the lawn mower according to Embodiment 3-1 of the present invention, in which the resin outside the coil is not shown. FIG. 21(B) is a view corresponding to FIG. 5 of the lawn mower according to Embodiment 3-1 of the present invention, in which the end surface of the resin outside the coil is hatched.
The coil outside resin 336A of the stator 323A in the brushless motor 321A of the motor unit 316A of the lawn mower is cylindrical and is arranged in series so as to commonly contact the outside of each of the plurality of coils 45. It extends from the lower surface of the upper wall of the upper case 326A in 322A to the upper surface of the lower wall of the lower case 327A. The coil outside resin 336A is in contact with the inner surface of the peripheral wall of the upper case 326A and the inner wall of the lower case 327A. The coil outer resin 336A is integrally molded with the stator 223A after the stator 223A is assembled and before the rotor 24 is assembled when the motor unit 316A is assembled. The coil outside resin 336A is used for all the electric materials (electrically exposed ones, here, each coil 45, the wire portion wound around the guide wall 90, the crossovers 117A to 117C and the sensor circuit board 47, and all the electric materials in the stator 323A. The short-circuit member 46) including the fusing terminal 99 and the welded portion 101 is covered.
A ring-shaped high thermal conductor 338 is arranged between the upper case 326A and the lower case 327A of the motor case 322A and on the radially outer side of the stator core 40. The high thermal conductor 338 is made of silicon resin here, and has high thermal conductivity as a resin. The high thermal conductor 338 is in contact with the stator core 40 and the upper case 326A and the lower case 327A, has an outer surface continuous with the outer surface of the upper case 326A and the outer surface of the lower case 327A, and has a lower surface than the upper case 326A in the motor case 322A. It is designed to fill the step of the case 327A.
　第３－１形態に係る芝刈機は、モータケース３２２Ａに保持され、ステータコア４０、コイル４５、及びステータコア４０とコイル４５との間に介在する絶縁部４４を有するステータ３２３Ａ、並びに、ステータ３２３Ａの内側に配置され、回転軸２５を有するロータ２４を備えたブラシレスモータ３２１Ａと、回転軸２５により駆動するスピンドル１７と、を備えており、ステータ３２３Ａは、コイル４５の外側、並びにステータコア４０及びモータケース３２２Ａの上下内面（上ケース３２６Ａの上壁下面から下ケース３２７Ａの下壁上面まで）に接触する樹脂であるコイル外側樹脂３３６Ａを有する。よって、ブラシレスモータ３２１Ａがステータコア４０及びモータケース３２２Ａに接触するコイル外側樹脂３３６Ａにより効率良く放熱され、放熱性に優れたブラシレスモータ３２１Ａを備えた芝刈機が提供される。更に、ステータ３２３Ａにおける全ての電材がコイル外側樹脂３３６Ａに覆われるため、ブラシレスモータ３２１Ａが防水性及び防塵性を備えることとなる。
　又、高熱伝導体３３８がモータケース３２２Ａの段差（上ケース３２６Ａと下ケース３２７Ａの間）に配置される。よって、高熱伝導体３３８が配置されない場合に比べて風が高熱伝導体３３８に接触し易くなり、放熱効率が更に向上する。
　更に、高熱伝導体３３８がステータコア４０に接触している。よって、ステータコア４０の放熱効率がより一層良好になる。 A lawn mower according to a 3-1st aspect is a stator 323A held by a motor case 322A, having a stator core 40, a coil 45, and an insulating portion 44 interposed between the stator core 40 and the coil 45, and the inside of the stator 323A. And a spindle 17 that is driven by the rotating shaft 25. The stator 323A includes the stator 323A outside the coil 45 and the stator core 40 and the motor case 322A. The coil outer resin 336A which is a resin that contacts the upper and lower inner surfaces (from the lower surface of the upper wall of the upper case 326A to the upper surface of the lower wall of the lower case 327A). Therefore, the brushless motor 321A is efficiently dissipated by the coil outer resin 336A that is in contact with the stator core 40 and the motor case 322A, and a lawnmower equipped with the brushless motor 321A having excellent heat dissipation is provided. Further, since all the electric material in the stator 323A is covered with the coil outer side resin 336A, the brushless motor 321A has waterproofness and dustproofness.
Further, the high thermal conductor 338 is arranged on the step (between the upper case 326A and the lower case 327A) of the motor case 322A. Therefore, as compared with the case where the high thermal conductor 338 is not arranged, the wind easily contacts the high thermal conductor 338, and the heat dissipation efficiency is further improved.
Further, the high thermal conductor 338 is in contact with the stator core 40. Therefore, the heat dissipation efficiency of the stator core 40 is further improved.
［第３－２形態］
　図２２（Ａ）は、本発明の第３－２形態に係る芝刈機の図５相当図であって、コイル外側樹脂が示されないものである。図２２（Ｂ）は、本発明の第３－２形態に係る芝刈機の図５相当図であって、コイル外側樹脂の端面がハッチングで示されるものである。
　当該芝刈機のモータユニット３１６Ｂのブラシレスモータ３２１Ｂにおけるステータ３２３Ｂのコイル外側樹脂３３６Ｂは、円筒状であって、複数の各コイル４５の外側に共通して接触するよう一連に配置されており、モータケース３２２Ｂにおける上ケース３２６Ｂの上壁下面より第１所定距離だけ離れた部分から、下ケース３２７Ｂの下壁上面より第２所定距離だけ離れた部分までにわたっている。即ち、コイル外側樹脂３３６Ｂは、上下にモータケース３２２Ｂ内面との隙間を有する状態で形成される。コイル外側樹脂３３６Ｂは、上ケース３２６Ｂの周壁内面及び下ケース３２７Ｂの周壁内面に接触している。コイル外側樹脂３３６Ｂは、モータユニット３１６Ｂ組立時におけるステータ２２３Ｂの組立後ロータ２４の組み付け前に、ステータ２２３Ｂに一体成形される。コイル外側樹脂３３６Ｂは、ステータ３２３Ｂにおける全ての電材（電気的に露出しているもの、ここでは各コイル４５，ガイド壁９０に巻かれたワイヤ部分，渡り線１１７Ａ～１１７Ｃ及びセンサ回路基板４７，並びにヒュージング端子９９及び溶接部１０１）を覆う。
　又、モータケース３２２Ｂにおける上ケース３２６Ｂと下ケース３２７Ｂの間であって、ステータコア４０の径方向外側の部分には、上述の高熱伝導体３３８が配置されている。
　更に、上ケース３２６Ｂの上壁には、通風口３３９ａが開けられており、下ケース３２７Ｂの下壁には、通風口３３９ｂが開けられている。遠心ファン３５で起こされた風は、通風口３３９ａからモータケース３２２Ｂ内に進入し、上の隙間、コイル外側樹脂３３６Ｂとロータ２４との間、及び下の隙間を通過して、通風口３３９ｂからモータケース３２２Ｂ外へ排出される。 [3-2nd form]
FIG. 22(A) is a view corresponding to FIG. 5 of the lawn mower according to Embodiment 3-2 of the present invention, in which the resin outside the coil is not shown. FIG. 22(B) is a view corresponding to FIG. 5 of the lawnmower according to Embodiment 3-2 of the present invention, in which the end surface of the resin outside the coil is hatched.
The coil outside resin 336B of the stator 323B in the brushless motor 321B of the motor unit 316B of the lawn mower is cylindrical and is arranged in series so as to commonly contact the outside of each of the plurality of coils 45. It extends from a portion of the upper case 326B that is separated from the lower surface of the upper wall of the upper case 326B by a first predetermined distance to a portion of the upper wall of the lower case 327B that is separated from the upper surface of the lower wall by a second predetermined distance. That is, the coil outside resin 336B is formed in a state having a gap between itself and the inner surface of the motor case 322B. The coil outer resin 336B is in contact with the inner surface of the peripheral wall of the upper case 326B and the inner wall of the lower case 327B. The coil outside resin 336B is integrally molded with the stator 223B after the stator 223B is assembled and before the rotor 24 is assembled when the motor unit 316B is assembled. The coil outside resin 336B is used for all the electric materials in the stator 323B (electrically exposed ones, here, each coil 45, the wire portion wound around the guide wall 90, the crossovers 117A to 117C and the sensor circuit board 47, and Cover the fusing terminal 99 and the weld 101).
Further, the high thermal conductor 338 described above is arranged in a portion of the motor case 322B between the upper case 326B and the lower case 327B and on the radially outer side of the stator core 40.
Further, a ventilation port 339a is opened on the upper wall of the upper case 326B, and a ventilation port 339b is opened on the lower wall of the lower case 327B. The wind generated by the centrifugal fan 35 enters the motor case 322B from the ventilation port 339a, passes through the upper gap, the coil outer resin 336B and the rotor 24, and the lower gap, and then from the ventilation port 339b. It is discharged to the outside of the motor case 322B.
　第３－２形態に係る芝刈機は、モータケース３２２Ｂに保持され、ステータコア４０、コイル４５、及びステータコア４０とコイル４５との間に介在する絶縁部４４を有するステータ３２３Ｂ、並びに、ステータ３２３Ｂの内側に配置され、回転軸２５を有するロータ２４を備えたブラシレスモータ３２１Ｂと、回転軸２５により駆動するスピンドル１７と、を備えており、ステータ３２３Ｂは、コイル４５の外側、並びにステータコア４０及びモータケース３２２Ｂの上下内面（上ケース３２６Ｂの周面から下ケース３２７Ｂの周面まで）に接触する樹脂であるコイル外側樹脂３３６Ｂを有する。よって、ブラシレスモータ３２１Ｂがステータコア４０及びモータケース３２２Ｂに接触するコイル外側樹脂３３６Ｂにより効率良く放熱され、放熱性に優れたブラシレスモータ３２１Ｂを備えた芝刈機が提供される。更に、ステータ３２３Ｂにおける全ての電材がコイル外側樹脂３３６Ｂに覆われるため、ブラシレスモータ３２１Ｂが防水性及び防塵性を備えることとなる。
　又更に、モータケース３２２Ｂは、通風口３３９ａ，３３９ｂを有している。よって、コイル４５及びステータコア４０等が内側からも冷却されることとなり、放熱性がより一層優れたものとなる。 A lawn mower according to a 3-2nd mode is held in a motor case 322B, has a stator core 40, a coil 45, and a stator 323B having an insulating portion 44 interposed between the stator core 40 and the coil 45, and the inside of the stator 323B. And a spindle 17 that is driven by the rotation shaft 25. The stator 323B is provided outside the coil 45, and the stator core 40 and the motor case 322B. Has a coil outer side resin 336B which is a resin contacting the upper and lower inner surfaces (from the peripheral surface of the upper case 326B to the peripheral surface of the lower case 327B). Therefore, the brushless motor 321B is efficiently dissipated by the coil outer resin 336B that is in contact with the stator core 40 and the motor case 322B, and a lawnmower including the brushless motor 321B having excellent heat dissipation is provided. Furthermore, since all the electric materials in the stator 323B are covered with the coil outer resin 336B, the brushless motor 321B has waterproofness and dustproofness.
Furthermore, the motor case 322B has ventilation ports 339a and 339b. Therefore, the coil 45, the stator core 40, and the like are cooled from the inside as well, and the heat dissipation is further improved.
［第３形態の変更例］
　尚、上記第３形態は、第１形態及び第２形態と同様の変更例を適宜有する。
　又、コイル外側樹脂３３６Ａ，３３６Ｂは、第２－１，２－３形態のように、各コイル４５毎に設けられても良く、この場合、各コイル外側樹脂３３６Ａ，３３６Ｂ間の隙間が存在することでモータケース３２２Ｂ内において風がより通り易くなり、コイル外側樹脂３３６Ａ，３３６Ｂの表面積が増加して風に接触するコイル外側樹脂３３６Ａ，３３６Ｂの部分が増加する。
　更に、コイル外側樹脂３３６Ｂは、第２－２，２－３形態のように、モータケース３２２Ｂとの隙間に対して突出するフィン２３７を有していても良い。
　高熱伝導体３３８は、省略されても良い。 [Modification of Third Embodiment]
In addition, the said 3rd form has the modification similar to a 1st form and a 2nd form suitably.
Further, the coil outer side resins 336A and 336B may be provided for each coil 45 as in the case of the 2-1 and 2-3 forms, and in this case, there is a gap between the coil outer side resins 336A and 336B. This makes it easier for the wind to pass through in the motor case 322B, increasing the surface area of the coil outer side resins 336A, 336B and increasing the portion of the coil outer side resins 336A, 336B in contact with the wind.
Furthermore, the coil outer side resin 336B may have fins 237 projecting into the gap with the motor case 322B, as in the second, second and third forms.
The high thermal conductor 338 may be omitted.
［第４形態］
　本発明の第４形態は、モータケースのフィンの側方視の形態を除き、第１形態と同様に成る。かような第４形態は、フィンの側方視の形態に応じ、第４－１形態から第４－４形態まである。第１形態と同様に成る部材及び部分については、同一の符号が付され、適宜説明が省略される。 [Fourth form]
The fourth mode of the present invention is the same as the first mode except for the side view of the fins of the motor case. The fourth mode includes the 4-1th mode to the 4-4th mode depending on the side view of the fin. Members and portions similar to those in the first embodiment are designated by the same reference numerals, and description thereof will be appropriately omitted.
［第４－１形態］
　図２３（Ｂ）は、本発明の第４－１形態に係る芝刈機のモータケース４２２Ａにおけるフィン４６５Ａの側方視形状の説明図（一部展開図）である。
　第４－１形態の各フィン４６５Ａは、第１形態の各フィン６５と同様に（図２３（Ａ）参照）、モータケース４２２Ａの外周面から起立しており、側面視で下広がりのテーパ状になっている。又、各フィン４６５Ａは、上下方向の長さが各フィン６５の半分程度であり、上下に交互に配置されている。
　かような各フィン４６５Ａにより、モータケース４２２Ａの表面積が増加すると共に、モータケース４２２Ａの上側において周方向に並べられた各フィン４６５Ａの間を通過した風が、モータケース４２２Ａの下側において周方向に並べられた各フィン４６５Ａに当たって、効率良い放熱が実現される。 [Form 4-1]
FIG. 23(B) is an explanatory view (partially developed view) of the side view shape of the fin 465A in the motor case 422A of the lawn mower according to Embodiment 4-1 of the present invention.
Like each fin 65 of the first embodiment (see FIG. 23A), each fin 465A of the 4-1st embodiment stands up from the outer peripheral surface of the motor case 422A and has a tapered shape that spreads downward in a side view. It has become. The fins 465A have a length in the up-down direction of about half that of the fins 65 and are alternately arranged in the up-down direction.
The fins 465A increase the surface area of the motor case 422A, and the wind passing between the fins 465A arranged in the circumferential direction on the upper side of the motor case 422A is circumferentially arranged on the lower side of the motor case 422A. Efficient heat dissipation is realized by hitting the fins 465A arranged in line.
［第４－２形態］
　図２３（Ｃ）は、本発明の第４－２形態に係る芝刈機のモータケース４２２Ｂにおけるフィン４６５Ｂの側方視形状の説明図（一部展開図）である。
　第４－２形態の各フィン４６５Ｂは、モータケース４２２Ｂの外周面から起立しており、側面視で全体にわたり幅が一定である直線状となっている。
　かような各フィン４６５Ｂによって、モータケース４２２Ｂの表面積が増加すると共に、それらの間を風が通って、効率良い放熱が実現される。 [Form 4-2]
FIG. 23C is an explanatory view (partially developed view) of the side view shape of the fin 465B in the motor case 422B of the lawnmower according to the 4-2nd embodiment of the present invention.
Each fin 465B of the 4-2nd form stands up from the outer peripheral surface of the motor case 422B, and has a linear shape with a constant width over the entire side view.
The fins 465B increase the surface area of the motor case 422B and allow air to pass therethrough, thereby achieving efficient heat dissipation.
［第４－３形態］
　図２３（Ｄ）は、本発明の第４－３形態に係る芝刈機のモータケース４２２Ｃにおけるフィン４６５Ｃの側方視形状の説明図（一部展開図）である。
　第４－３形態の各フィン４６５Ｃは、モータケース４２２Ｃの外周面から起立しており、側面視で全体にわたり幅が一定である直線状となっている。又、各フィン４６５Ｃは、上下方向の長さが各フィン４６５Ｂの半分程度であり、上下に交互に配置されている。
　かような各フィン４６５Ｃによって、モータケース４２２Ｃの表面積が増加すると共に、モータケース４２２Ｃの上側において周方向に並べられた各フィン４６５Ｃの間を通過した風が、モータケース４２２Ａの下側において周方向に並べられた各フィン４６５Ａに当たって、効率良い放熱が実現される。 [Form 4-3]
FIG. 23D is an explanatory view (partially developed view) of the side view shape of the fin 465C in the motor case 422C of the lawnmower according to the fourth to third aspects of the present invention.
Each of the fins 465C according to the fourth to third forms is erected from the outer peripheral surface of the motor case 422C, and has a linear shape with a constant width over the entire side view. The fins 465C have a vertical length of about half that of the fins 465B, and the fins 465C are alternately arranged vertically.
The fins 465C increase the surface area of the motor case 422C, and the wind passing between the fins 465C arranged in the circumferential direction on the upper side of the motor case 422C is circumferentially arranged on the lower side of the motor case 422A. Efficient heat dissipation is realized by hitting the fins 465A arranged in line.
［第４－４形態］
　図２３（Ｅ）は、本発明の第４－４形態に係る芝刈機のモータケース４２２Ｄにおけるフィン４６５Ｄの側方視形状の説明図（一部展開図）である。
　第４－４形態の各フィン４６５Ｄは、モータケース４２２Ｄの外周面から起立しており、側面視で全体にわたり幅が一定であって、且つ回転軸２５の方向（上下方向）に対して側面視で角度を有するように右上がりで斜行する直線状となっている。
　各フィン４６５Ｄの側面視での右上端は、右隣のフィン４６５Ｄの左下端よりも左方にあり、隣接するフィン４６５Ｄ同士は上下方向において重なっていない。よって、フィン４６５Ｄ付きのモータケース４２２Ｄは、金型鋳造（ダイカスト）により、形成可能である。
　かような各フィン４６５Ｄによって、モータケース４２２Ｄの表面積が増加すると共に、各フィン４６５Ｄは、上方からの風Ｗにつき角度を持って受け止めることができ、各フィン４６５Ｄに風Ｗが効率良く当たって、効率良い放熱が実現される。 [Form 4-4]
FIG. 23(E) is an explanatory view (partially developed view) of the side view shape of the fin 465D in the motor case 422D of the lawnmower according to the fourth to fourth aspects of the present invention.
Each of the fins 465D of the fourth to fourth forms is erected from the outer peripheral surface of the motor case 422D, has a constant width over the entire side view, and is viewed from the side in the direction of the rotary shaft 25 (vertical direction). It is a straight line that slopes upward to the right so that it has an angle.
The upper right end of each fin 465D in a side view is on the left side of the lower left end of the right adjacent fin 465D, and the adjacent fins 465D do not overlap each other in the vertical direction. Therefore, the motor case 422D with the fins 465D can be formed by die casting.
The fins 465D increase the surface area of the motor case 422D, and the fins 465D can catch the wind W from above at an angle, and the wind W efficiently hits the fins 465D. Efficient heat dissipation is realized.
［第４形態の変更例］
　尚、上記第４形態は、第１形態ないし第３形態と同様の変更例を適宜有する。
　又、第４形態は、第２形態又は第３形態と組み合わせられても良い。
　更に、幅が一定のフィンとテーパ状のフィンが併用されていても良いし、各フィンが上下３段以上で並ぶ配置とされても良い。
　各フィンの長さが互いに異なるものとされて、風が各フィンに当たる総合的な回数が増加し、放熱効率が向上するものとされても良い。
　第４－４形態の各フィン４６５Ｄは、三次元プリンタ等により、上下方向において一部重なるように形成されても良い。 [Modification of Fourth Embodiment]
In addition, the above-described fourth mode appropriately has the same modification examples as the first to third modes.
Further, the fourth mode may be combined with the second mode or the third mode.
Further, fins having a constant width and tapered fins may be used together, or the fins may be arranged in three or more rows in the vertical direction.
The lengths of the fins may be different from each other, and the total number of times the wind hits the fins may be increased to improve the heat dissipation efficiency.
The fins 465D in the fourth to fourth aspects may be formed so as to partially overlap each other in the vertical direction by a three-dimensional printer or the like.
［第５形態］
　本発明の第５形態は、モータケースのフィンの上面視の形態を除き、第１形態と同様に成る。かような第５形態は、フィンの上面視の形態に応じ、第５－１形態から第５－９形態まである。第１形態と同様に成る部材及び部分については、同一の符号が付され、適宜説明が省略される。 [Fifth form]
The fifth mode of the present invention is the same as the first mode except for the top view of the fins of the motor case. Such a fifth form includes a 5-1st form to a 5-9th form, depending on the form of the fin viewed from above. Members and portions similar to those in the first embodiment are designated by the same reference numerals, and description thereof will be appropriately omitted.
［第５－１形態］
　図２４（Ｂ）は、本発明の第５－１形態に係る芝刈機のモータケース５２２Ａにおけるフィン５６５Ａの上面視形状の説明図である。
　図２４（Ａ）に示されるように、第１形態の径方向に放射状に延びる各フィン６５が、モータケース２２の上面（スラスト面）においては、外縁から上方に起立しているのに対し、図２４（Ｂ）の第５－１形態の各フィン５６５Ａは、モータケース５２２Ａの上面の中心から周端に及ぶ状態で上方に起立している。第５－１形態のモータケース５２２Ａの上面は、平坦に形成されている。
　かような各フィン５６５Ａにより、モータケース５２２Ａの表面積が増加すると共に、モータケース５２２Ａの上面の各フィン５６５Ａの周囲を風が通過して、効率良い放熱が実現される。 [Form 5-1]
FIG. 24(B) is an explanatory view of the top view shape of the fin 565A in the motor case 522A of the lawn mower according to Embodiment 5-1 of the present invention.
As shown in FIG. 24(A), the fins 65 radially extending in the radial direction of the first embodiment stand up from the outer edge upward on the upper surface (thrust surface) of the motor case 22. Each fin 565A of the 5-1st form in FIG. 24B stands up in a state of extending from the center of the upper surface of the motor case 522A to the peripheral edge. The upper surface of the motor case 522A of the 5-1st form is formed flat.
Such fins 565A increase the surface area of the motor case 522A and allow air to pass around the fins 565A on the upper surface of the motor case 522A, thereby achieving efficient heat dissipation.
［第５－２形態］
　図２４（Ｃ）は、本発明の第５－２形態に係る芝刈機のモータケース５２２Ｂにおけるフィン群５６５Ｂの上面視形状の説明図である。
　第５－２形態のフィン群５６５Ｂは、モータケース５２２Ｂの上面の中心から周端に及ぶ状態で上方に起立している複数のフィン５６５Ｂ１と、それらの間で中央部から周端に及ぶ状態で上方に起立している複数のフィン５６５Ｂ２と、フィン５６５Ｂ１，５６５Ｂ２の間であってモータケース５２２Ｂの上面の外縁において径方向に延びて上方に起立している複数のフィン５６５Ｂ３と、を有する。第５－２形態のモータケース５２２Ｂの上面は、平坦に形成されている。
　かようなフィン群５６５Ｂにより、モータケース５２２Ｂの表面積が増加すると共に、モータケース５２２Ｂの上面のフィン群５６５Ｂに風が当たる総合的な回数が増加して、効率良い放熱が実現される。 [Form 5-2]
FIG. 24C is an explanatory diagram of the top view shape of the fin group 565B in the motor case 522B of the lawn mower according to Embodiment 5-2 of the present invention.
The fin group 565B according to the 5-2nd embodiment has a plurality of fins 565B1 standing upright in a state extending from the center of the upper surface of the motor case 522B to the peripheral edge, and a state in which the fin group 565B extends from the central portion to the peripheral edge between them. A plurality of fins 565B2 standing upright, and a plurality of fins 565B3 standing between the fins 565B1 and 565B2 and extending radially in the outer edge of the upper surface of the motor case 522B and standing upright. The upper surface of the motor case 522B in the 5-2nd form is formed flat.
With such a fin group 565B, the surface area of the motor case 522B is increased, and the total number of times that the fin group 565B on the upper surface of the motor case 522B is blown is increased, so that efficient heat dissipation is realized.
［第５－３形態］
　図２４（Ｄ）は、本発明の第５－３形態に係る芝刈機のモータケース５２２Ｃにおけるフィン群５６５Ｃの上面視形状の説明図である。
　第５－３形態のフィン群５６５Ｃは、モータケース５２２Ｃの上面の中心部から周端に及ぶ状態で上方に起立している複数のフィン５６５Ｃ１と、それらの間で中央部から周端に及ぶ状態で上方に起立している複数のフィン５６５Ｃ２と、フィン５６５Ｃ１，５６５Ｃ２の間であってモータケース５２２Ｃの上面の外縁において径方向に延びて上方に起立している複数のフィン５６５Ｃ３と、を有する。各フィン５６５Ｃ１の径方向の内部に、上方に突出したあるいは平坦な上軸受保持部６６が配置される。
　かようなフィン群５６５Ｃにより、モータケース５２２Ｃの表面積が増加すると共に、モータケース５２２Ｃの上面のフィン群５６５Ｃに風が当たる総合的な回数が増加して、効率良い放熱が実現される。 [Form 5-3]
FIG. 24D is an explanatory diagram of a top view shape of the fin group 565C in the motor case 522C of the lawn mower according to the fifth to third aspects of the present invention.
The fin group 565C of the fifth to third forms is a state in which a plurality of fins 565C1 are erected upward in a state of extending from the central portion of the upper surface of the motor case 522C to the peripheral edge and a state of extending from the central portion to the peripheral edge between them. And a plurality of fins 565C3 standing between the fins 565C1 and 565C2 and extending radially in the outer edge of the upper surface of the motor case 522C and standing above the fins 565C3. An upper bearing holding portion 66 that protrudes upward or is flat is arranged inside the fins 565C1 in the radial direction.
Such a fin group 565C increases the surface area of the motor case 522C, and increases the total number of times that the fin group 565C on the upper surface of the motor case 522C is blown by air, thereby realizing efficient heat dissipation.
［第５－４形態］
　図２５（Ａ）は、本発明の第５－４形態に係る芝刈機のモータケース５２２Ｄにおけるフィン群５６５Ｄの上面視形状の説明図である。
　第５－３形態のフィン群５６５Ｄは、中心部において円筒状に上方に起立されるフィン５６５Ｄ１と、その径方向外側において同心で円筒状に突出するフィン５６５Ｄ２と、・・・を有する。フィン５６５Ｄ１の内部に、上方に突出したあるいは平坦な上軸受保持部６６が配置される。
　かようなフィン群５６５Ｄにより、モータケース５２２Ｄの表面積が増加すると共に、モータケース５２２Ｄの上面のフィン群５６５Ｄに風が当たって、効率良い放熱が実現される。 [Form 5-4]
FIG. 25(A) is an explanatory diagram of a top view shape of the fin group 565D in the motor case 522D of the lawn mower according to Embodiment 5-4 of the present invention.
The fin group 565D according to the fifth to third aspects includes a fin 565D1 that is erected upward in a cylindrical shape in the center portion, a fin 565D2 that is concentrically protruded in a cylindrical shape on the outer side in the radial direction, and so on. Inside the fin 565D1, an upper bearing holding portion 66 that protrudes upward or is flat is arranged.
Due to the fin group 565D, the surface area of the motor case 522D is increased, and the fin group 565D on the upper surface of the motor case 522D is exposed to the wind to realize efficient heat dissipation.
［第５－５形態］
　図２５（Ｂ）は、本発明の第５－５形態に係る芝刈機のモータケース５２２Ｅにおけるフィン群５６５Ｅの上面視形状の説明図である。
　第５－３形態のフィン群５６５Ｅは、中心部において円筒が周方向に分割された状態で上方に起立される一組のフィン５６５Ｅ１と、その径方向外側において同心で同様に突出する一組のフィン５６５Ｅ２と、・・・を有する。フィン５６５Ｅ１の内部に、上方に突出したあるいは平坦な上軸受保持部６６が配置される。
　かようなフィン群５６５Ｅにより、モータケース５２２Ｅの表面積が増加すると共に、モータケース５２２Ｅの上面のフィン群５６５Ｅに風が当たる総合的な回数が増加して、効率良い放熱が実現される。 [Form 5-5]
FIG. 25B is an explanatory diagram of a top view shape of the fin group 565E in the motor case 522E of the lawn mower according to the fifth to fifth aspects of the present invention.
The fin group 565E of the fifth to fifth forms includes a set of fins 565E1 that is erected upward in a state where a cylinder is divided in the circumferential direction in the central portion, and a set of fins that also concentrically protrude on the radially outer side. It has fins 565E2,.... Inside the fin 565E1, an upper bearing holding portion 66 that projects upward or is flat is arranged.
Due to the fin group 565E, the surface area of the motor case 522E is increased, and the total number of times that the fin group 565E on the upper surface of the motor case 522E is hit by the wind is increased, and efficient heat dissipation is realized.
［第５－６形態］
　図２５（Ｃ）は、本発明の第５－６形態に係る芝刈機のモータケース５２２Ｆにおけるフィン５６５Ｆの上面視形状の説明図である。
　第５－３形態のフィン５６５Ｆは、上面視で、中心部から外縁に徐々に近づく渦巻状となっている。フィン５６５Ｆの内部に、上方に突出したあるいは平坦な上軸受保持部６６が配置される。
　かようなフィン５６５Ｆにより、モータケース５２２Ｆの表面積が増加すると共に、モータケース５２２Ｆの上面のフィン５６５Ｆに風が当たって、効率良い放熱が実現される。 [Form 5-6]
FIG. 25C is an explanatory diagram of the top view shape of the fin 565F in the motor case 522F of the lawn mower according to the fifth to sixth aspects of the present invention.
The fin 565F of the fifth-third form has a spiral shape in which the fin gradually approaches the outer edge from the center in a top view. Inside the fin 565F, an upper bearing holding portion 66 that projects upward or is flat is arranged.
The fins 565F increase the surface area of the motor case 522F, and at the same time, the fins 565F on the upper surface of the motor case 522F are blown by the wind to realize efficient heat dissipation.
［第５－７形態］
　図２５（Ｄ）は、本発明の第５－７形態に係る芝刈機のモータケース５２２Ｇにおけるフィン群５６５Ｇの上面視形状の説明図である。
　第５－３形態のフィン群５６５Ｇは、上面視で、中心部から外縁に徐々に近づく渦巻状の仮想線上に並ぶフィン５６５Ｇ１，５６５Ｇ２・・が含まれている。中心側のフィン５６５Ｇ１，５６５Ｇ２・・の内部に、上方に突出したあるいは平坦な上軸受保持部６６が配置される。
　かようなフィン群５６５Ｇにより、モータケース５２２Ｇの表面積が増加すると共に、モータケース５２２Ｇの上面のフィン群５６５Ｇに風が当たる総合的な回数が増加して、効率良い放熱が実現される。 [Form 5-7]
FIG. 25D is an explanatory diagram of a top view shape of the fin group 565G in the motor case 522G of the lawn mower according to the fifth to seventh aspects of the present invention.
The fin group 565G of the fifth-third aspect includes fins 565G1, 565G2... Arranged on a spiral imaginary line that gradually approaches the outer edge from the center in a top view. Inside the fins 565G1, 565G2,... On the center side, an upper bearing holding portion 66 that is protruded upward or flat is arranged.
Such a fin group 565G increases the surface area of the motor case 522G, and increases the total number of times that the fin group 565G on the upper surface of the motor case 522G is blown with air, thereby realizing efficient heat dissipation.
［第５－８形態］
　図２５（Ｅ）は、本発明の第５－８形態に係る芝刈機のモータケース５２２Ｈにおけるフィン５６５Ｈの上面視形状の説明図である。
　第５－８形態の各フィン５６５Ｈは、上面視で、中心から外縁にかけて弧状に延びるものとなっており、全体として風車状に配置されている。第５－８形態のモータケース５２２Ｈの上面は、平坦に形成されている。
　かような各フィン５６５Ｈにより、モータケース５２２Ｈの表面積が増加すると共に、モータケース５２２Ｈの上面のフィン５６５Ｈに風が当たって、効率良い放熱が実現される。 [Form 5-8]
FIG. 25(E) is an explanatory diagram of the top view shape of the fin 565H in the motor case 522H of the lawnmower according to the fifth to eighth aspects of the present invention.
Each of the fins 565H in the fifth to eighth modes extends in an arc shape from the center to the outer edge in a top view, and is arranged in a windmill shape as a whole. The upper surface of the motor case 522H of the fifth to eighth modes is formed flat.
The fins 565H increase the surface area of the motor case 522H, and at the same time, the fins 565H on the upper surface of the motor case 522H are exposed to the wind to realize efficient heat dissipation.
［第５－９形態］
　図２５（Ｆ）は、本発明の第５－９形態に係る芝刈機のモータケース５２２Ｉにおけるフィン５６５Ｉの上面視形状の説明図である。
　第５－８形態の各フィン５６５Ｉは、上面視で、中央部から外縁にかけて弧状に延びるものとなっており、全体として中心のつながれていない風車状に配置されている。各フィン５６５Ｉの径方向内方に、上方に突出したあるいは平坦な上軸受保持部６６が配置される。
　かような各フィン５６５Ｉにより、モータケース５２２Ｉの表面積が増加すると共に、モータケース５２２Ｉの上面のフィン５６５Ｉに風が当たって、効率良い放熱が実現される。 [Form 5-9]
FIG. 25F is an explanatory diagram of the top view shape of the fin 565I in the motor case 522I of the lawnmower according to the fifth to ninth aspects of the present invention.
Each of the fins 565I of the fifth to eighth modes extends in an arc shape from the central portion to the outer edge in a top view, and is arranged in a windmill shape in which the centers are not connected as a whole. An upper bearing holding portion 66 that protrudes upward or is flat is arranged radially inward of each fin 565I.
Such fins 565I increase the surface area of the motor case 522I, and the fins 565I on the upper surface of the motor case 522I are exposed to the wind to realize efficient heat dissipation.
［第５形態の変更例］
　尚、上記第５形態は、第１形態ないし第４形態と同様の変更例を適宜有する。
　又、第５形態は、第２形態ないし第４形態と組み合わせられても良い。
　更に、スラスト面におけるフィン（群）５６５Ａ～５６５Ｉは、外縁に行くに従い太くなるようなテーパ状に形成されても良い。
　フィン（群）５６５Ａ～５６５Ｉにおける設置数、配置及び大きさの少なくとも何れかは、適宜変更可能である。
　第５－３形態におけるフィン群５６５Ｃの径方向内側に第５－４形態におけるフィン群５６５Ｄの中心部側が配置されたり、第５－４形態におけるフィン群５６５Ｄの外周部側のみが第５－５形態のように分割されたりする等、各種の形態が組み合わせられても良い。
　モータケース５２２Ａ～５２２Ｉの上面に代えて、あるいは上面と共に、下面にフィン（群）５６５Ａ～５６５Ｉが設けられても良い。
　第１形態のフィン６５が図２３（Ａ）の側面視形状と図２４（Ａ）の上面視形状とを有する一連のものとされているように、第４形態の何れかの側面視形状と第５形態の何れかの上面視形状とを有する一連のフィンが設けられても良い。 [Modification Example of Fifth Embodiment]
In addition, the said 5th form has the example of a change similar to the 1st form thru|or the 4th form suitably.
The fifth form may be combined with the second to fourth forms.
Further, the fins (groups) 565A to 565I on the thrust surface may be formed in a tapered shape that becomes thicker toward the outer edge.
At least one of the number of installed fins (groups) 565A to 565I, the arrangement, and the size thereof can be appropriately changed.
The center side of the fin group 565D in the 5-4th form is arranged radially inward of the fin group 565C in the 5-3th form, or only the outer peripheral side of the fin group 565D in the 5-4th form is arranged in the 5-5th form. Various forms may be combined, such as being divided like forms.
Fins (groups) 565A to 565I may be provided on the lower surface instead of or together with the upper surfaces of the motor cases 522A to 522I.
As the fin 65 of the first mode is a series having the side view shape of FIG. 23(A) and the top view shape of FIG. 24(A), any one of the side view shapes of the fourth mode A series of fins having any of the top view shapes of the fifth aspect may be provided.
［第６形態］
　本発明の第６形態は、モータケース及びステータの形態を除き、第１形態と同様に成る。第１形態と同様に成る部材及び部分については、同一の符号が付され、適宜説明が省略される。
　図２６は、本発明の第６形態に係る芝刈機のモータユニット６１６の縦断面説明図である。
　モータユニット６１６のモータケース６２２は、底を上側とするカップ状であり上端部外側にフランジ６２６ａを有する上ケース６２６と、底を下側とする有底二重筒状であり外筒部６２７ａの上開口部内において径方向内方にリング状に突出する内フランジ６２７ｂを有する下ケース６２７と、を備えている。
　上ケース６２６及び下ケース６２７は、内フランジ６２７ｂの上側に防水部材としての弾性体（ゴム）製のＯリング６２８ａ（弾性部材）を介してフランジ６２６ａが載る状態で合わせられている。上ケース６２６は、下ケース６２７の外筒部６２７ａ内に入り、下ケース６２７の内筒部６２７ｃと向かい合う。
　上ケース６２６の下部と下ケース６２７の内筒部６２７ｃの上部との間に、ステータコア４０、上インシュレータ４２、下インシュレータ４３、絶縁部４４及びコイル４５を有するステータ６２３のステータコア４０が挟み込まれている。ステータ６２３は、コイル外側樹脂３６を備えていない。 [Sixth form]
The sixth form of the present invention is the same as the first form except for the forms of the motor case and the stator. Members and portions similar to those in the first embodiment are designated by the same reference numerals, and description thereof will be appropriately omitted.
FIG. 26 is a vertical cross-sectional explanatory view of the motor unit 616 of the lawnmower according to the sixth embodiment of the present invention.
The motor case 622 of the motor unit 616 has a cup-like shape having a bottom on the upper side and an upper case 626 having a flange 626a on the outer side of the upper end, and a bottomed double-cylinder shape having an outer cylinder 627a. And a lower case 627 having an inner flange 627b protruding radially inward in the upper opening.
The upper case 626 and the lower case 627 are fitted on the upper side of the inner flange 627b with the flange 626a mounted thereon via an O-ring 628a (elastic member) made of an elastic body (rubber) as a waterproof member. The upper case 626 enters the outer cylindrical portion 627a of the lower case 627 and faces the inner cylindrical portion 627c of the lower case 627.
The stator core 40 of the stator 623 including the stator core 40, the upper insulator 42, the lower insulator 43, the insulating portion 44, and the coil 45 is sandwiched between the lower portion of the upper case 626 and the upper portion of the inner cylindrical portion 627c of the lower case 627. .. The stator 623 does not include the coil outer resin 36.
　上ケース６２６の上壁中央部には、Ｏリング６２８ｂを介してロータ２４の回転軸２５の軸受６８が保持されており、下ケース６２７の下壁中央部には、Ｏリング６２８ｃを介して回転軸２５の軸受７６が保持されている。
　又、回転軸２５における軸受７６とロータコア５５との間の部分に対し、遠心ファン６３５が固定されている。遠心ファン６３５は、下ケース６２７の内筒部６２７ｃの内側に配置されており、コイル４５及びステータコア４０の下方に配置されている。
　内筒部６２７ｃにおける遠心ファン６３５の径方向外方の部分には、内筒部６２７ｃの内側と外側とをつなぐ複数の通風口としての貫通孔６２７ｄが形成されている。他方、上ケース６２６におけるフランジ６２６ａの下方の部分には、同様に複数の通風口としての貫通孔６２６ｂが形成されている。そして、これらの貫通孔６２７ｄ，６２６ｂ、並びに内筒部６２７ｃと外筒部６２７ａとの間、ステータコア４０と及び外筒部６２７ａとの間、及び上ケース６２６と外筒部６２７ａとの間により、風路Ｗ１が形成される。内筒部６２７ｃ及び上ケース６２６がモータケース６２２の内壁となり、外筒部６２７ａがモータケース６２２の外壁となっている。 A bearing 68 of the rotary shaft 25 of the rotor 24 is held in the center of the upper wall of the upper case 626 via an O-ring 628b, and is rotated in the center of the lower wall of the lower case 627 via an O-ring 628c. The bearing 76 of the shaft 25 is held.
A centrifugal fan 635 is fixed to a portion of the rotary shaft 25 between the bearing 76 and the rotor core 55. The centrifugal fan 635 is arranged inside the inner cylindrical portion 627c of the lower case 627, and is arranged below the coil 45 and the stator core 40.
A through hole 627d is formed in a portion of the inner cylindrical portion 627c that is radially outward of the centrifugal fan 635, as a plurality of ventilation holes that connect the inner side and the outer side of the inner cylindrical portion 627c. On the other hand, through holes 626b serving as a plurality of ventilation holes are similarly formed in a portion of the upper case 626 below the flange 626a. Then, by these through holes 627d, 626b, and between the inner cylinder portion 627c and the outer cylinder portion 627a, between the stator core 40 and the outer cylinder portion 627a, and between the upper case 626 and the outer cylinder portion 627a, The air passage W1 is formed. The inner tubular portion 627c and the upper case 626 serve as an inner wall of the motor case 622, and the outer tubular portion 627a serves as an outer wall of the motor case 622.
　ロータ２４の回転軸２５が回転すると、遠心ファン６３５が回転して空気を径方向外方へ押す。すると、貫通孔６２７ｄを通過する風Ｗ２が発生し、風路Ｗ１に案内されて風路Ｗ１を通過する風Ｗ３となり、更に貫通孔６２６ｂを通過する風Ｗ４となる。風Ｗ４は、各コイル４５の上部と上ケース６２６の上内壁との間に進入し、遠心ファン６３５に吸い寄せられて各コイル４５間（図６，図７参照）への風Ｗ５となって、各コイル４５等を冷却する。遠心ファン６３５の回転中、一連の風Ｗ２～Ｗ５が巡り続ける。 When the rotary shaft 25 of the rotor 24 rotates, the centrifugal fan 635 rotates and pushes air radially outward. Then, the wind W2 passing through the through hole 627d is generated, becomes the wind W3 guided by the air passage W1 and passes through the wind passage W1, and becomes the wind W4 further passing through the through hole 626b. The wind W4 enters between the upper part of each coil 45 and the upper inner wall of the upper case 626, is sucked by the centrifugal fan 635, and becomes the wind W5 between the coils 45 (see FIGS. 6 and 7). The coils 45 and the like are cooled. During the rotation of the centrifugal fan 635, a series of winds W2 to W5 continue to circulate.
　かような第６形態の芝刈機は、モータケース６２２に保持され、ステータコア４０、コイル４５、及びステータコア４０とコイル４５との間に介在する絶縁部４４を有するステータ６２３、並びに、ステータ６２３の内側に配置され、回転軸２５を有するロータ２４を備えたブラシレスモータ６２１と、回転軸２５により駆動するスピンドル１７と、回転軸２５により駆動する遠心ファン６３５と、を備えており、モータケース６２２は、外壁（下ケース６２７の外筒部６２７ａ）と内壁（下ケース６２７の内筒部６２７ｃ及び上ケース６２６）とを有しており、内壁内にブラシレスモータ６２１及び遠心ファン６３５を保持しており、遠心ファン６３５による風Ｗ３は、モータケース６２２の外壁と内壁の間を通過する。よって、モータケース６２２内で風Ｗ２～Ｗ５が循環し、ブラシレスモータ６２１が風Ｗ２～Ｗ５により効率良く放熱され、放熱性に優れたブラシレスモータ２１を備えた芝刈機が提供される。
　又、モータケース６２２は、貫通孔６２７ｄ，６２６ｂを有している。よって、外壁と内壁の間の通風路に係る風路がシンプルに形成される。 Such a sixth type lawnmower is held in the motor case 622 and has a stator core 40, a coil 45, a stator 623 having an insulating portion 44 interposed between the stator core 40 and the coil 45, and the inside of the stator 623. Is provided with a rotor 24 having a rotating shaft 25, a brushless motor 621, a spindle 17 driven by the rotating shaft 25, and a centrifugal fan 635 driven by the rotating shaft 25. It has an outer wall (the outer cylinder portion 627a of the lower case 627) and an inner wall (the inner cylinder portion 627c of the lower case 627 and the upper case 626), and holds the brushless motor 621 and the centrifugal fan 635 inside the inner wall. The wind W3 from the centrifugal fan 635 passes between the outer wall and the inner wall of the motor case 622. Therefore, the winds W2 to W5 circulate in the motor case 622, the brushless motor 621 is efficiently radiated by the winds W2 to W5, and the lawn mower provided with the brushless motor 21 having excellent heat dissipation is provided.
The motor case 622 has through holes 627d and 626b. Therefore, the air passage related to the air passage between the outer wall and the inner wall is simply formed.
［第６形態の変更例］
　尚、上記第６形態は、第１形態ないし第５形態と同様の変更例を適宜有する。
　又、第６形態は、第１形態ないし第５形態と組み合わせられても良く、特に、第１形態ないし第３形態のコイル外側樹脂が設けられても良いし、第４形態ないし第５形態のフィンが設けられても良い。
　遠心ファン６３５に代えて、軸流ファン等の他の形式のファンが用いられても良い。 [Modification Example of Sixth Mode]
In addition, the above-mentioned 6th form has the modification similar to the 1st form thru|or the 5th form suitably.
The sixth form may be combined with the first to fifth forms, and in particular, the coil outside resin of the first to third forms may be provided, or the fourth to fifth forms may be provided. Fins may be provided.
Instead of the centrifugal fan 635, another type of fan such as an axial flow fan may be used.
［第７形態］
　本発明の第７形態は、設置態様及びコイル外側樹脂の配置を除いて第３－２形態のブラシレスモータ３２１Ｂと同様に成るブラシレスモータ７２１が搭載されたグラインダ７０１である。第３－２形態と同様に成る部材及び部分については、同一の符号が付され、適宜説明が省略される。 [Seventh form]
A seventh mode of the present invention is a grinder 701 equipped with a brushless motor 721 that is similar to the brushless motor 321B of the third to second modes except for the installation mode and the arrangement of the resin outside the coil. Members and portions similar to those in the 3-2nd embodiment are denoted by the same reference numerals, and description thereof will be appropriately omitted.
　図２７（Ａ）はグラインダ７０１の一部中央縦断面説明図である。図２７（Ｂ）は図２７（Ａ）のＡ－Ａ線断面説明図である。
　グラインダ７０１は、ブラシレスモータ７２１と、これを保持する樹脂製で筒状のモータハウジング７２２と、その後端部に設けられた電源としてのバッテリパック７１３を装着可能なバッテリ装着部７１２と、ブラシレスモータ７２１のオンオフを切り替えるスイッチ（図示略）と、モータハウジング７２２の前端部に連結されたギヤハウジング７１０と、ギヤハウジング７１０内に配置されたギヤ部７１６と、を有している。
　ブラシレスモータ７２１のロータ２４の回転軸２５は、前方に突出しており、ギヤ部７１６を駆動して、ギヤ部７１６につながっており上下方向に延びる出力部としてのスピンドル７１７を駆動する。スピンドル７１７の下端部は、ギヤハウジング７１０の下部から下方に出ている。
　ブラシレスモータ７２１は、上ケース２６及び下ケース２７から成るモータケース２２に入れられず、そのステータ７２３のステータコア４０の外面は、モータハウジング７２２の内面に接触している。 FIG. 27A is a partial central longitudinal cross sectional view of the grinder 701. FIG. 27(B) is a sectional view taken along the line AA of FIG. 27(A).
The grinder 701 includes a brushless motor 721, a resin-made tubular motor housing 722 that holds the brushless motor 721, a battery mounting portion 712 that is provided at a rear end portion of the brushless motor 721, and is capable of mounting a battery pack 713 as a power source, and a brushless motor 721. A switch (not shown) for switching on and off, a gear housing 710 connected to the front end portion of the motor housing 722, and a gear portion 716 arranged in the gear housing 710.
The rotary shaft 25 of the rotor 24 of the brushless motor 721 projects forward, drives the gear part 716, and drives the spindle 717, which is connected to the gear part 716 and extends in the vertical direction. The lower end of the spindle 717 extends downward from the lower part of the gear housing 710.
The brushless motor 721 is not placed in the motor case 22 including the upper case 26 and the lower case 27, and the outer surface of the stator core 40 of the stator 723 is in contact with the inner surface of the motor housing 722.
　そして、コイル外側樹脂７３６は、筒状であり、各ティース４１の先端部より径方向外側の部分であって各コイル４５間に位置する部分、及びステータコア４０の前後端を超えてモータハウジング７２２の内面に接触する部分を有している。モータハウジング７２２は、コイル外側樹脂７３６が接触するため、本発明における「ケース」となっている。
　コイル外側樹脂７３６の前端は、ギヤ部７１６の後側に位置しており、コイル外側樹脂７３６の後端は、バッテリ装着部７１２につながるようにバッテリ装着部７１２の前側に配置された電気部品（図示略）の前側に位置している。 The coil outside resin 736 has a tubular shape, and is a portion radially outside of the tip end portion of each tooth 41 and located between the coils 45, and beyond the front and rear ends of the stator core 40 of the motor housing 722. It has a portion that contacts the inner surface. The motor housing 722 is a “case” in the present invention because the coil outer resin 736 is in contact therewith.
The front end of the coil outer side resin 736 is located on the rear side of the gear part 716, and the rear end of the coil outer side resin 736 is connected to the battery mounting part 712, and the electric component (which is disposed on the front side of the battery mounting part 712). (Not shown) is located on the front side.
　グラインダ７０１は、モータハウジング７２２（ケース）に保持され、ステータコア４０、コイル４５、及びステータコア４０とコイル４５との間に介在する絶縁部４４（図２７において省略）を有するステータ７２３、並びに、ステータ７２３の内側に配置され、回転軸２５を有するロータ２４を備えたブラシレスモータ７２１と、回転軸２５により駆動するスピンドル７１７と、を備えており、ステータ７２３は、各コイル４５の外側並びにステータコア４０及びモータハウジング７２２に接触する樹脂であるコイル外側樹脂７３６を有する。よって、ブラシレスモータ７２１がコイル外側樹脂７３６、ステータコア４０及びモータハウジング７２２により効率良く放熱され、放熱性に優れたブラシレスモータ７２１を備えたグラインダ７０１が提供される。 The grinder 701 is held by a motor housing 722 (case) and has a stator 723 having a stator core 40, a coil 45, and an insulating portion 44 (not shown in FIG. 27) interposed between the stator core 40 and the coil 45, and a stator 723. And a spindle 717 driven by the rotating shaft 25. The stator 723 is provided outside the coils 45 and the stator core 40 and the motor. It has a coil outside resin 736 which is a resin that contacts the housing 722. Therefore, the brushless motor 721 is efficiently radiated by the coil outside resin 736, the stator core 40 and the motor housing 722, and the grinder 701 including the brushless motor 721 having excellent heat radiation is provided.
［第７形態の変更例］
　尚、上記第７形態は、第１形態ないし第６形態と同様の変更例を適宜有する。
　又、第７形態は、第１形態ないし第６形態と組み合わせられても良く、特に、第１形態ないし第２形態のコイル外側樹脂が設けられても良いし、第４形態ないし第５形態のフィンが設けられても良い。 [Modification Example of Seventh Mode]
The seventh mode has modifications similar to the first to sixth modes as appropriate.
The seventh mode may be combined with the first mode to the sixth mode, in particular, the coil outside resin of the first mode or the second mode may be provided, or the resin of the fourth mode to the fifth mode may be provided. Fins may be provided.
［第８形態］
　本発明の第８形態は、設置態様及びコイル外側樹脂の配置を除いて第３－２形態のブラシレスモータ３２１Ｂと同様に成るブラシレスモータ８２１が搭載されたインパクト工具の一例としてのインパクトドライバ８０１である。第３－２形態と同様に成る部材及び部分については、同一の符号が付され、適宜説明が省略される。 [Eighth mode]
The eighth form of the present invention is an impact driver 801 as an example of an impact tool in which a brushless motor 821 similar to the brushless motor 321B of the third to third forms is mounted except for the installation mode and the arrangement of the resin outside the coil. .. Members and portions similar to those in the 3-2nd embodiment are denoted by the same reference numerals, and description thereof will be appropriately omitted.
　図２８（Ａ）はグラインダ８０１の一部中央縦断面説明図である。図２８（Ｂ）は図２８（Ａ）のＢ－Ｂ線断面説明図である。
　インパクトドライバ８０１は、ブラシレスモータ８２１と、その左右の側部を支持する樹脂製で左右半割状のモータハウジング８２２と、そのブラシレスモータ８２１支持部から下方に延びるグリップ部の下端部に設けられており電源としてのバッテリパック８１３を装着可能なバッテリ装着部８１２と、ブラシレスモータ８２１のオンオフを切り替えるスイッチ（図示略）と、モータハウジング８２２内であってブラシレスモータ８２１の前側に配置されたギヤ部８１６と、を有している。
　モータハウジング８２２は、左モータハウジング８２２Ｌと右モータハウジング８２２Ｒとを有しており、複数のネジ８３２によって結合されている。
　ブラシレスモータ８２１のロータ２４の回転軸２５は、前方に突出しており、ギヤ部８１６を駆動して、ギヤ部８１６につながっており前後方向に延びる出力部としてのスピンドル８１７を駆動する。スピンドル８１７の前端部は、モータハウジング８２２の前上部から前方に出ている。
　ブラシレスモータ８２１は、上ケース２６及び下ケース２７から成るモータケース２２に入れられず、そのステータ８２３のステータコア４０の左右側部の外面は、モータハウジング８２２の後上部の左右内面に接触している。 FIG. 28(A) is a partial central longitudinal cross sectional view of the grinder 801. FIG. 28(B) is a sectional view taken along line BB of FIG. 28(A).
The impact driver 801 is provided on the brushless motor 821, a resin left and right half-divided motor housing 822 for supporting the left and right side portions thereof, and a lower end portion of a grip portion extending downward from the brushless motor 821 support portion. A battery mounting portion 812 to which the battery pack 813 as a cage power source can be mounted, a switch (not shown) for switching the brushless motor 821 on and off, and a gear portion 816 arranged in the motor housing 822 in front of the brushless motor 821. And have.
The motor housing 822 includes a left motor housing 822L and a right motor housing 822R, which are connected by a plurality of screws 832.
The rotary shaft 25 of the rotor 24 of the brushless motor 821 projects forward, drives the gear portion 816, and drives a spindle 817 that is connected to the gear portion 816 and extends in the front-rear direction. The front end of the spindle 817 projects forward from the upper front part of the motor housing 822.
The brushless motor 821 is not placed in the motor case 22 including the upper case 26 and the lower case 27, and the outer surfaces of the left and right side portions of the stator core 40 of the stator 823 are in contact with the left and right inner surfaces of the upper rear portion of the motor housing 822. ..
　そして、コイル外側樹脂８３６は、筒状であり、各ティース４１の先端部より径方向外側の部分であって各コイル４５間に位置する部分、及びステータコア４０の左右側部の前後端を超えてモータハウジング８２２の内面に回り込んで接触する部分を有している。モータハウジング８２２は、コイル外側樹脂８３６が接触するため、本発明における「ケース」となっている。
　コイル外側樹脂８３６の前端は、ギヤ部８１６の後側に位置しており、コイル外側樹脂８３６の後端は、モータハウジング８２２の後上端部に位置している。 The coil outside resin 836 has a tubular shape and extends beyond the tip end portion of each tooth 41 in the radial direction and between the coils 45 and the front and rear ends of the left and right side portions of the stator core 40. It has a portion that wraps around and contacts the inner surface of the motor housing 822. The motor housing 822 is a “case” in the present invention because the coil outside resin 836 is in contact therewith.
The front end of the coil outer resin 836 is located on the rear side of the gear portion 816, and the rear end of the coil outer resin 836 is located on the rear upper end of the motor housing 822.
　インパクトドライバ８０１は、モータハウジング８２２（ケース）に対し左右側部を支持することで保持され、ステータコア４０、コイル４５、及びステータコア４０とコイル４５との間に介在する絶縁部４４（図２８において省略）を有するステータ８２３、並びに、ステータ８２３の内側に配置され、回転軸２５を有するロータ２４を備えたブラシレスモータ８２１と、回転軸２５により駆動するスピンドル８１７と、を備えており、ステータ８２３は、各コイル４５の外側並びにステータコア４０及びモータハウジング８２２の左右内面に接触する樹脂であるコイル外側樹脂８３６を有する。よって、ブラシレスモータ８２１がコイル外側樹脂８３６、ステータコア４０及びモータハウジング８２２により効率良く放熱され、放熱性に優れたブラシレスモータ８２１を備えたインパクトドライバ８０１が提供される。 The impact driver 801 is held by supporting the left and right side portions with respect to the motor housing 822 (case), and the stator core 40, the coil 45, and the insulating portion 44 (not shown in FIG. 28) interposed between the stator core 40 and the coil 45. ), a brushless motor 821 arranged inside the stator 823 and provided with the rotor 24 having the rotating shaft 25, and a spindle 817 driven by the rotating shaft 25. It has a coil outside resin 836 which is a resin that contacts the outside of each coil 45 and the left and right inner surfaces of the stator core 40 and the motor housing 822. Therefore, the brushless motor 821 is efficiently radiated by the coil outside resin 836, the stator core 40, and the motor housing 822, and the impact driver 801 including the brushless motor 821 having excellent heat radiation is provided.
［第８形態の変更例］
　尚、上記第８形態は、第１形態ないし第７形態と同様の変更例を適宜有する。
　又、第８形態は、第１形態ないし第６形態と組み合わせられても良く、特に、第１形態ないし第２形態のコイル外側樹脂が設けられても良いし、第４形態ないし第５形態のフィンが設けられても良い。 [Modification Example of Eighth Mode]
Note that the eighth form has modifications appropriately similar to the first to seventh forms.
The eighth form may be combined with the first form to the sixth form, and in particular, the coil outside resin of the first form or the second form may be provided, or the fourth form to the fifth form. Fins may be provided.
　１・・芝刈機（園芸工具，電動作業機）、１０・・本体ハウジング（外側ハウジング）、１７，７１７，８１７・・スピンドル（出力部）、２１，２２１Ａ，２２１Ｂ，２２１Ｃ，３２１Ａ，３２１Ｂ，６２１，７２１，８２１・・ブラシレスモータ、２２，３２２Ａ，３２２Ｂ，５２２Ａ，５２２Ｂ，５２２Ｃ，５２２Ｄ，５２２Ｅ，５２２Ｆ，５２２Ｇ，５２２Ｈ，５２２Ｉ，６２２・・モータケース（ケース）、２３，２２３Ａ，２２３Ｂ，２２３Ｃ，３２３Ａ，３２３Ｂ，６２３，７２３，８２３・・ステータ、２４・・ロータ、２５・・回転軸、３６，２３６Ａ，２３６Ｂ，２３６Ｃ，３３６Ａ，３３６Ｂ，７３６，８３６・・コイル外側樹脂、４０・・ステータコア、４４・・絶縁部（インシュレータ）、４５・・コイル、２３７・・（コイル外側樹脂の）フィン、３３８・・高熱伝導体、３３９ａ，３３９ｂ・・通風口、６２７ａ・・外筒部（外壁）、６２７ｃ・・内筒部（内壁）、６２６ｂ，６２７ｄ・・貫通孔（通風口）、６３５・・遠心ファン（ファン）、７２２，８２２・・モータハウジング（ケース）、７０１・・グラインダ、８０１・・インパクトドライバ（インパクト工具）、Ｗ１・・風路、Ｗ２～Ｗ５・・風。 1... Lawn mowers (horticultural tools, electric working machines), 10... Main body housing (outer housing), 17,717,817... Spindle (output unit) 21,221A, 221B, 221C, 321A, 321B, 621 , 721, 821.. Brushless motors, 22, 322A, 322B, 522A, 522B, 522C, 522D, 522E, 522F, 522G, 522H, 522I, 622.. Motor cases (cases), 23, 223A, 223B, 223C, 323A, 323B, 623, 723, 823.. Stator, 24.. Rotor, 25.. Rotating shaft, 36, 236A, 236B, 236C, 336A, 336B, 736, 836.. Coil outside resin, 40.. Stator core, 44.. Insulation part (insulator), 45.. coil, 237.. fin (of resin outside coil), 338.. high thermal conductor, 339a, 339b.. ventilation port, 627a.. outer cylinder part (outer wall), 627c ··· Inner tube portion (inner wall), 626b, 627d ··· Through hole (vent), 635 · · Centrifugal fan (fan), 722, 822 · · Motor housing (case), 701 · · Grinder, 801 · · Impact driver (impact tool), W1...wind passage, W2-W5...wind.

Claims (21)

  1. 　ケースに保持され、ステータコア、コイル、及び前記ステータコアと前記コイルとの間に介在するインシュレータを有するステータ、並びに、前記ステータの内側に配置され、回転軸を有するロータを備えたブラシレスモータと、
    　前記回転軸により駆動する出力部と、
    を備えており、
    　前記ステータは、前記コイルの外側、並びに、前記ケース及び前記ステータコアの少なくとも一方に接触する樹脂であるコイル外側樹脂を有する
    ことを特徴とする電動作業機。     A stator having a stator core, a coil, and an insulator interposed between the stator core and the coil, the brushless motor being disposed inside the stator and having a rotor having a rotating shaft;
    An output unit driven by the rotating shaft,
    Is equipped with
    The electric working machine is characterized in that the stator has a coil outside resin which is a resin that contacts the outside of the coil and at least one of the case and the stator core.
  2. 　前記コイルは、複数設けられており、
    　前記コイル外側樹脂は、複数の各前記コイルの外側に共通して接触するよう一連に配置されている
    ことを特徴とする請求項１に記載の電動作業機。     The coil is provided in plural,
    The electric working machine according to claim 1, wherein the coil outside resin is arranged in series so as to commonly contact the outside of each of the plurality of coils.
  3. 　前記コイルは、複数設けられており、
    　前記コイル外側樹脂は、複数の各前記コイルの間に形成された溝を有している
    ことを特徴とする請求項１又は請求項２に記載の電動作業機。     The coil is provided in plural,
    The electric coil machine according to claim 1 or 2, wherein the resin on the outside of the coil has a groove formed between each of the coils.
  4. 　前記ケースは、非磁性体の金属製である
    ことを特徴とする請求項１ないし請求項３の何れかに記載の電動作業機。     The electric working machine according to any one of claims 1 to 3, wherein the case is made of a nonmagnetic metal.
  5. 　前記コイル外側樹脂は、フィンを有している
    ことを特徴とする請求項１ないし請求項４の何れかに記載の電動作業機。     The electric working machine according to any one of claims 1 to 4, wherein the resin on the outside of the coil has fins.
  6. 　前記コイル外側樹脂は、前記ステータにおける全ての露出した電材を覆っている
    ことを特徴とする請求項１ないし請求項４の何れかに記載の電動作業機。     The electric working machine according to any one of claims 1 to 4, wherein the resin on the outside of the coil covers all exposed electric materials in the stator.
  7. 　前記ケースは、通風口を有している
    ことを特徴とする請求項６に記載の電動作業機。     The electric working machine according to claim 6, wherein the case has a ventilation port.
  8. 　前記コイル外側樹脂は、シリコン樹脂である
    ことを特徴とする請求項１ないし請求項７の何れかに記載の電動作業機。     The electric working machine according to any one of claims 1 to 7, wherein the resin outside the coil is a silicone resin.
  9. 　前記ステータコアは、それぞれ内側に突出する複数のティースを有しており、
    　前記コイルは、複数設けられており、前記インシュレータを介して各前記ティースに巻かれており、
    　前記コイル外側樹脂は、各前記ティースの突出端部を覆わない
    ことを特徴とする請求項１ないし請求項８の何れかに記載の電動作業機。     The stator core has a plurality of teeth each protruding inward,
    The coil is provided in plural, and is wound around each of the teeth via the insulator,
    9. The electric working machine according to claim 1, wherein the resin on the outside of the coil does not cover the protruding end portion of each tooth.
  10. 　前記ケースは、ケースフィンを有している
    ことを特徴とする請求項１ないし請求項９の何れかに記載の電動作業機。     The electric working machine according to any one of claims 1 to 9, wherein the case has a case fin.
  11. 　前記ケースフィンは、前記ケースの外周面に設けられている
    ことを特徴とする請求項１０に記載の電動作業機。     The electric working machine according to claim 10, wherein the case fin is provided on an outer peripheral surface of the case.
  12. 　前記ケースフィンは、テーパ状である
    ことを特徴とする請求項１１に記載の電動作業機。     The electric working machine according to claim 11, wherein the case fin has a tapered shape.
  13. 　前記ケースフィンは、複数設けられており、交互に配置されている
    ことを特徴とする請求項１１又は請求項１２に記載の電動作業機。     The electric work machine according to claim 11 or 12, wherein a plurality of the case fins are provided and are arranged alternately.
  14. 　前記ケースフィンは、前記ブラシレスモータの回転軸に対して斜行している
    ことを特徴とする請求項１１ないし請求項１３の何れかに記載の電動作業機。     The electric working machine according to any one of claims 11 to 13, wherein the case fin is slanted with respect to a rotation shaft of the brushless motor.
  15. 　前記ケースフィンは、前記ケースのスラスト面に設けられている
    ことを特徴とする請求項１０に記載の電動作業機。     The electric working machine according to claim 10, wherein the case fin is provided on a thrust surface of the case.
  16. 　前記ケースフィンは、放射状に延びている
    ことを特徴とする請求項１５に記載の電動作業機。     The electric work machine according to claim 15, wherein the case fins extend radially.
  17. 　前記ケースフィンは、複数設けられており、同心で円筒状に突出している
    ことを特徴とする請求項１５に記載の電動作業機。     The electric work machine according to claim 15, wherein a plurality of the case fins are provided and concentrically project in a cylindrical shape.
  18. 　前記ケースフィンは、中心部から外縁へ徐々に近づく渦巻状に延びている
    ことを特徴とする請求項１５に記載の電動作業機。     The electric working machine according to claim 15, wherein the case fin extends in a spiral shape that gradually approaches the outer edge from the center portion.
  19. 　前記ケースフィンは、周方向に分割されている
    ことを特徴とする請求項１７又は請求項１８に記載の電動作業機。     The electric work machine according to claim 17 or 18, wherein the case fin is divided in a circumferential direction.
  20. 　ケースに保持され、ステータコア、コイル、及び前記ステータコアと前記コイルとの間に介在するインシュレータを有するステータ、並びに、前記ステータの内側に配置され、回転軸を有するロータを備えたブラシレスモータと、
    　前記回転軸により駆動する出力部と、
    　前記回転軸により駆動するファンと、
    を備えており、
    　前記ケースは、外壁と内壁とを有しており、前記内壁内に前記ブラシレスモータ及び前記ファンを保持しており、
    　前記ファンによる風は、前記外壁と前記内壁の間を通過する
    ことを特徴とする電動作業機。     A stator having a stator core, a coil, and an insulator interposed between the stator core and the coil, the brushless motor being disposed inside the stator and having a rotor having a rotating shaft;
    An output unit driven by the rotating shaft,
    A fan driven by the rotating shaft,
    Is equipped with
    The case has an outer wall and an inner wall, holds the brushless motor and the fan in the inner wall,
    The electric working machine wherein the wind from the fan passes between the outer wall and the inner wall.
  21. 　前記ケースは、通風口を有している
    ことを特徴とする請求項２０に記載の電動作業機。     The electric working machine according to claim 20, wherein the case has a ventilation port.
PCT/JP2020/004391 2019-02-19 2020-02-05 Electric work machine WO2020170824A1 (en)

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JP2016140148A (en) * 2015-01-26 2016-08-04 株式会社デンソー Rotary electric machine
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JPS5372102A (en) * 1976-12-10 1978-06-27 Hitachi Ltd Molded motor
JPS602370U (en) * 1983-06-15 1985-01-09 株式会社安川電機 Cooling system for totally enclosed squirrel cage induction motor
JPH0677468U (en) * 1993-03-31 1994-10-28 株式会社高岳製作所 Motor
JPH07288949A (en) * 1994-04-13 1995-10-31 Nippondenso Co Ltd Electric motor to drive vehicle
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