WO2020203292A1 - Rotor and electric motor including rotor - Google Patents
Rotor and electric motor including rotor Download PDFInfo
- Publication number
- WO2020203292A1 WO2020203292A1 PCT/JP2020/011973 JP2020011973W WO2020203292A1 WO 2020203292 A1 WO2020203292 A1 WO 2020203292A1 JP 2020011973 W JP2020011973 W JP 2020011973W WO 2020203292 A1 WO2020203292 A1 WO 2020203292A1
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- WO
- WIPO (PCT)
- Prior art keywords
- peripheral side
- iron core
- rotor
- side iron
- inner peripheral
- Prior art date
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
Definitions
- the present invention relates to a rotor having an insulating member and an electric motor provided with the rotor.
- an inner rotor type permanent magnet electric motor in which a rotor having a permanent magnet is rotatably arranged inside a stator that generates a rotating magnetic field is known.
- This permanent magnet electric motor is used, for example, for rotationally driving a blower fan mounted on an air conditioner.
- the rotor includes, for example, an annular permanent magnet, an annular outer peripheral iron core located on the inner diameter side of the permanent magnet, an annular inner peripheral iron core located on the inner diameter side of the outer peripheral iron core, and an outer peripheral iron core and inner core. It includes an insulating member located between the peripheral cores and a shaft fixed to a through hole penetrating in the direction of the central axis of the inner core.
- the insulating member of such a rotor is a connecting portion that connects the outer peripheral side iron core and the inner peripheral side iron core, and is formed of, for example, a resin filled between the outer peripheral side iron core and the inner peripheral side iron core.
- the common mode voltage is divided as the potential on the inner ring side (shaft side) of the bearing by the capacitance distribution between the stator winding and the shaft and the capacitance between the shaft and the inverter drive circuit board. To. Then, the common mode voltage is divided as a potential on the outer ring side (bracket side) of the bearing by the capacitance between the winding of the stator and the bracket and the capacitance between the bracket and the circuit board for driving the inverter. To. The potential difference between the inner ring side and the outer ring side of this bearing is the shaft voltage.
- an object of the present invention is to provide a rotor having an insulating member capable of preventing thermal cracking while maintaining strength, and an electric motor provided with the rotor.
- one aspect of the rotor of the present invention includes an outer peripheral side iron core, an inner peripheral side iron core, and a connecting portion for connecting the outer peripheral side iron core and the inner peripheral side iron core.
- the connecting portion is formed of an insulating resin.
- a plurality of first recesses arranged in an annular shape and a plurality of second recesses connecting the first recesses adjacent to each other in the circumferential direction are provided on both end faces in the axial direction of the connecting portion.
- the depth of the second recess is formed shallower than the depth of the first recess.
- One aspect of the electric motor of the present invention includes a stator fixed to the outer shell of the motor and a rotor arranged on the inner diameter side of the stator.
- the rotor is made of an insulating resin, which is located between the annular outer peripheral side iron core to which the permanent magnet is fixed, the inner peripheral side iron core located on the inner diameter side of the outer peripheral side iron core, and the outer peripheral side iron core and the inner peripheral side iron core. It is provided with a formed connecting portion and a shaft that is connected to an iron core on the inner peripheral side and is rotatably supported by a bearing on the outer shell of the motor.
- the rotor is provided with a plurality of first recesses arranged in an annular shape and a plurality of second recesses connecting the first recesses adjacent to each other in the circumferential direction on both end faces in the axial direction of the connecting portion. ..
- the depth of the second recess is formed shallower than the depth of the first recess.
- FIG. 6 is a cross-sectional view taken along the line AA of FIG.
- FIG. 6 is a cross-sectional view taken along the line BB of FIG.
- FIG. 7 is a cross-sectional view taken along the line CC of FIG.
- FIG. 7 is a sectional view taken along line DD of FIG.
- It is a perspective view of the rotor, the shaft and the 2nd bearing of the permanent magnet electric motor which concerns on this invention.
- It is sectional drawing which shows the permanent magnet electric motor which concerns on this invention.
- It is a perspective view which shows how the permanent magnet electric motor of FIG. 1 or FIG. 12 is attached to the outdoor unit of an air conditioner.
- FIG. 1 is a partially enlarged view on the left side of FIG.
- the permanent magnet electric motor 1 is, for example, a brushless DC motor.
- the electric motor 1 is used to rotationally drive the blower fan mounted on the outdoor unit 10 of the air conditioner as shown in FIG.
- the outdoor unit 10 of the air conditioner includes, for example, a bottom plate 102 screwed to the base 101 of the outdoor unit 10, an upper plate 103 fixed to the upper part of the outdoor unit 10, a pedestal 104 to which the electric motor 1 is attached, and a bottom plate. It is provided with two columns 105 to which the 102, the upper plate 103, and the pedestal 104 are fixed.
- the electric motor 1 is screwed to the central portion of the pedestal 104.
- the permanent magnet electric motor 1 in the present embodiment includes a stator 2, a rotor 3, and a motor outer shell 6.
- the stator 2 includes a stator core 21 having a cylindrical yoke portion and a plurality of teeth portions extending from the yoke portion to the inner diameter side, and a winding 23 wound around the teeth portion via an insulator 22. ..
- the stator 2 is covered with a motor outer shell 6 made of resin, except for the inner peripheral surface of the stator core 21.
- the rotor 3 is rotatably arranged with a predetermined gap on the inner peripheral side of the stator core 21 of the stator 2.
- the rotor 3 is a surface magnet type in which permanent magnets 31 are arranged in an annular shape on the outer peripheral surface facing the stator core 21.
- the permanent magnet 31 is fixed to the outer peripheral surface of the outer peripheral side iron core 32, which will be described later.
- the shaft 35 is connected to the inner peripheral side iron core 34, and the power generated by the rotor 2 is transmitted to the load (blower fan) via the shaft 35 to rotationally drive the blower fan. .. Further, the shaft 35 is supported by the first bearing 41 and the second bearing 42, the first bearing 41 is supported by the first bracket 51, and the second bearing 42 is supported by the second bracket 52, whereby the rotor 3 is supported. Is rotatably supported.
- the first bearing 41 supports one end side (output side) of the shaft 35 of the rotor 3.
- the second bearing 42 supports the other end side (counter-output side) of the shaft 35 of the rotor 3.
- first bearing 41 and the second bearing 42 for example, ball bearings are used.
- the first bracket 51 is made of metal (steel plate, aluminum, etc.) and is arranged on one end side of the motor outer shell 6, that is, on the output side of the shaft 35.
- the first bracket 51 has a first bearing accommodating portion 511 for accommodating the first bearing 41, and a flange portion 512 extending around from the open end of the first bearing accommodating portion 511.
- the first bearing accommodating portion 511 is formed in a cylindrical shape having a bottom portion provided with a through hole for passing the shaft 35, and the flange portion 512 of the first bracket 51 is insert-molded at the time of molding the motor outer shell 6. , It is integrated with the motor outer shell 6.
- the outer ring of the first bearing 41 is press-fitted into the inner surface of the first bearing accommodating portion 511, and the output side of the shaft 35 supported by the inner ring of the first bearing 41 is formed in the center of the bottom portion of the first bearing accommodating portion 511. It protrudes to the outside from the through hole.
- the second bracket 52 is made of metal (steel plate, aluminum, etc.) and is fixed to the other end side of the motor outer shell 6, that is, the counter-output side of the shaft 35.
- the second bracket 52 includes a disc-shaped bracket main body 521, an outer edge portion 520 that closes an end portion of the motor outer shell 6 on the opposite output side, and a second bearing accommodating portion 522 for accommodating the second bearing 42. And have.
- the outer edge 520 of the second bracket 52 is screwed to the end of the motor outer shell 6 on the opposite output side.
- the second bearing accommodating portion 522 is formed as a hole having a circular bottom surface recessed from the motor outer shell 6 side (output side) in the central portion of the bracket main body portion 521.
- the first bearing 41 is housed in the first bearing accommodating portion 511 provided in the first bracket 51, and the second bearing 42 is accommodated in the second bearing accommodating portion 522 provided in the second bracket 52.
- the first bearing 41 and the first bearing accommodating portion 511, and the second bearing 42 and the second bearing accommodating portion 522 are electrically conductive, respectively.
- the second bracket 52 integrally includes a heat sink between the second bearing accommodating portion 522 and the outer edge portion 520 in the radial direction. As a result, the space of the electric motor 1 can be saved.
- the second bracket is provided with heat radiation fins 523 erected outward on the opposite output side of the shaft 35 as a heat sink, and is a circuit board 72 for controlling the electric motor 1 via a heat transfer member 71 (particularly, The heat from the electronic component 721) mounted on the circuit board 72 is efficiently dissipated by the heat radiating fins 523.
- the rotor 3 has a permanent magnet 31, an outer peripheral side iron core 32, an insulating member (connecting portion) 33, and an inner peripheral side iron core 34 from the outer diameter side to the inner diameter side. And the shaft 35 is provided.
- the permanent magnet 31 is annular with a plurality of (for example, 8 or 10) permanent magnet pieces 311 so that the north and south poles appear alternately at equal intervals in the circumferential direction. Is formed in.
- a plastic magnet formed in an annular shape by solidifying the magnet powder with a resin may be used.
- the outer peripheral side iron core 32 is formed in an annular shape as shown in FIG. 2, and is located on the inner diameter side of the permanent magnet 31 as shown in FIGS. 11 and 12.
- the outer peripheral side iron core 32 is recessed from the inner peripheral surface (see FIG. 2) to the outer diameter side in order to secure the function of preventing rotation with the insulating member 33 described later, and the direction of the axis O of the rotor 3 (hereinafter, hereinafter, It is provided with a plurality of (for example, five in the circumferential direction) inner peripheral side recesses 321 extending in the axial direction. That is, the inner peripheral side recess 321 is a key groove that prevents rotation of the insulating member 33 (a groove that prevents slipping between the insulating member 33.
- the outer peripheral side iron core 32 is provided with a plurality of outer peripheral side protrusions 322 (for example, 10 in the circumferential direction) protruding from the outer peripheral surface to the outer diameter side in order to position the permanent magnet 31.
- the plurality of inner peripheral side recesses 321 extend in the axial direction from the end face of the insulating member 33 and are arranged at equal intervals in the circumferential direction.
- two inner peripheral side recesses 321 are arranged so as to extend from both ends of the outer peripheral side iron core 32 in the axial direction.
- the outer peripheral side iron core 32 has a partition wall 323 (retaining portion) between the inner peripheral side recesses 321 adjacent to each other in the axial direction, and the partition wall 323 causes the insulating member 33 (connecting portion) (in both axial directions). ) Can be prevented from coming off.
- the plurality of outer peripheral protrusions 322 extend in the axial direction and are arranged at equal intervals in the circumferential direction. Further, each outer peripheral side protrusion 322 is arranged so as to extend from one end to the other end of the outer peripheral side iron core 32 in the axial direction.
- the inner peripheral side iron core 34 is formed in an annular shape as shown in FIG. 3, and is located on the inner diameter side of the outer peripheral side iron core 32 as shown in FIGS. 5 to 10.
- the inner peripheral side iron core 34 is recessed from the outer peripheral surface (see FIG. 3) toward the inner diameter side and extends in the axial direction (for example, in the circumferential direction) in order to secure the function of preventing rotation with the insulating member 33 described later. 6) outer peripheral side recesses 341 are provided. That is, the outer peripheral side recess 341 functions as a key groove for preventing rotation of the insulating member 33.
- the plurality of outer peripheral side recesses 341 extend in the axial direction and are arranged at equal intervals in the circumferential direction.
- the outer peripheral side recess 341 is partitioned by a partition wall 344 (retaining portion) arranged at the center in the axial direction. Therefore, two outer peripheral side recesses 341 are arranged so as to extend from both end portions of the inner peripheral side iron core 34.
- the inner peripheral side iron core 34 has a partition wall 344 between the outer peripheral side recesses 341 adjacent to each other in the axial direction, and the partition wall 344 (removal portion) of the insulating member 33 (connecting portion) (in both axial directions). ) Can be prevented from coming off.
- the inner peripheral side iron core 34 may be provided with a plurality of through holes 342 for lightening the weight between the through hole 343 and the outer peripheral surface of the inner peripheral side iron core 34. These plurality of through holes 342 are arranged at equal intervals in the circumferential direction so that the shape of the inner peripheral side iron core 34 in which the through holes 342 are formed becomes a spoke shape when viewed from the axial direction.
- the insulating member 33 is made of a dielectric resin such as PBT (polybutylene terephthalate) or PET (polyethylene terephthalate), and is located between the outer peripheral side iron core 32 and the inner peripheral side iron core 34.
- the insulating member 33 is integrally formed with the outer peripheral side iron core 32 and the inner peripheral side iron core 34 by insert molding in which a resin is filled between the outer peripheral side iron core 32 and the inner peripheral side iron core 34.
- the insulating member 33 has a small capacitance between the outer peripheral side iron core 32 and the inner peripheral side iron core 34 (a part of the capacitance between the winding 23 of the stator 2 and the shaft 35).
- the insulating member 33 includes (plural) outer peripheral side convex portions 338 on the outer peripheral surface that engage with the inner peripheral side concave portion 321 of the outer peripheral side iron core 32 described above. Further, the insulating member 33 includes (plural) inner peripheral side convex portions 339 that engage with the outer peripheral side concave portions 341 of the inner peripheral side iron core 34 on the inner peripheral surface.
- an engaging portion (inner peripheral side recess 321 and outer peripheral side recess 321) provided between the outer peripheral side iron core 32 and the insulating member (connecting portion) 33 to prevent rotation between the outer peripheral side iron core 32 and the insulating member 33.
- the side convex portion 338) is used as the first concave-convex engaging portion, and is provided between the insulating member 33 and the inner peripheral side iron core 34 to prevent rotation between the insulating member 33 and the inner peripheral side iron core 34.
- the joint portion (inner peripheral side convex portion 339 and outer peripheral side concave portion 341) is referred to as a second uneven engagement portion.
- the outer peripheral side iron core 32 and the inner peripheral side iron core 34 are formed with recesses of the concave-convex engaging portion (the first concave-convex engaging portion and the second concave-convex engaging portion) to insulate.
- An example is shown in which a convex portion of the concave-convex engaging portion is formed on the member (connecting portion) 33.
- the concave portion and the convex portion of the concave-convex engaging portion are arranged on the rotor core (32, 34) or the insulating member 33 may be reversed from the above-mentioned case.
- the convex portion of the concave-convex engaging portion may be provided on the outer peripheral side iron core 32 and the inner peripheral side iron core 34, and the concave portion of the concave-convex engaging portion may be provided on the insulating member 33.
- the first concave-convex engaging portions 321 and 338 and the second concave-convex engaging portions 339 and 341 have inner peripheral recesses 321 adjacent to each other in the axial direction. Since the partition wall 323 (retaining portion) is formed between the two, and the partition wall 344 (removing portion) is formed between the outer peripheral side recesses 341 adjacent to each other in the axial direction, the outer peripheral side iron core 32 and the inner peripheral side iron core 34 are formed.
- the insulating member 33 can be prevented from coming off. Therefore, as described above, the first concavo-convex engaging portion 321 and 338 and the second concavo-convex engaging portion 339 and 341 can have both a rotation preventing function and a retaining function by engaging each of the unevenness.
- the concave-convex engaging portion that functions as a key (a mechanical element that fastens the rotating body to the shaft) when the rotor 3 rotates.
- the position where the concave-convex engaging portion (key) is arranged is the position of the radius r [m] from the central axis O on the shaft for transmitting the torque having a size of T [Nm], the shape of the concave-convex engaging portion.
- the shear stress ⁇ 1 acting between the members on the outer diameter side is always larger (that is, ⁇ 1 ⁇ 2 always holds). Therefore, by increasing the number of the second concave-convex engaging portions 339 and 341 in the circumferential direction to be larger than the number of the first concave-convex engaging portions 321 and 338 in the circumferential direction, they are provided between the members on the inner diameter side.
- the shear stress acting on the individual first uneven engaging portions 321 and 338 can be reduced, and the detent of the insulating member 33 can be further strengthened.
- the shaft 35 is passed through a through hole 343 provided in the inner peripheral side iron core 34, and is fixed to the inner peripheral side iron core 34 by press fitting or caulking.
- the neutral point potential of the winding does not become zero, and the common mode voltage is used. A voltage called is generated. Due to this common mode voltage, a potential difference (shaft voltage) is generated between the outer ring and the inner ring of the first bearing 41 and the second bearing 42 due to the stray capacitance inside the permanent magnet motor 1. When this shaft voltage reaches the dielectric breakdown voltage of the oil film inside the bearing, a current flows inside the bearing and causes electrolytic corrosion inside the bearing.
- the insulating member 33 is formed in a cylindrical shape as shown in FIGS. 4 to 10, and in order to reduce the capacitance of the rotor 3, one end in the axial direction is in the first axial direction.
- a hole 331 is formed, and a second axial hole 332 for reducing the capacitance of the rotor 3 is similarly formed at the other end in the axial direction.
- a plurality (for example, 10) of these first axial holes 331 and the second axial holes 332 are formed at equal intervals in the circumferential direction.
- a partition wall 334 is uniformly formed between each of the plurality of first axial holes 331 and between each of the plurality of second axial holes 332, and the first axial holes adjacent to each other in the circumferential direction.
- the 331s and the second axial holes 332 adjacent to each other in the circumferential direction are separated from each other.
- the plan view and the bottom view of the rotor 3 are the same.
- the partition wall 334 enhances the mechanical strength of the insulating member 33 (connecting portion), and when the rotor 3 rotates, the power of the rotational motion is sufficiently transmitted between the inner peripheral side iron core 34 and the outer peripheral side iron core 32. Can be done.
- the first axial hole 331 and the second axial hole 332 face each other in the axial direction, and the center of the insulating member 33 in the axial direction (the first axis facing the axial direction).
- a wall portion 333 is provided so as to divide the holes so that the depths of the holes are the same.
- the wall portion 333 enhances the mechanical strength of the insulating member 33 (connecting portion), and when the rotor 3 rotates, the power of the rotational movement is sufficiently transmitted between the inner peripheral side iron core 34 and the outer peripheral side iron core 32. be able to.
- a bottom portion 335c of the first axial direction hole 331 is formed on one end side of the wall portion 333, and a bottom portion of the second axial direction hole 332 is formed on the other end side of the wall portion 333.
- 335c is formed.
- a side wall 335a and a side wall 335b are formed along the axial direction from the bottom 335c of each of the first axial hole 331 and the second axial hole 332.
- the first axial hole 331 and the second axial hole 332 have a structure having a depth in the direction along the axial direction from both end faces by forming the wall portion 333. Further, as shown in FIGS. 6 to 9, the first axial hole 331 and the second axial hole 332 are formed so that the end face shape seen from the axial direction is an arc shape along the circumferential direction, respectively. Are formed at equal intervals (for example, 10 in the circumferential direction).
- the radius of the rotor 3 is small, so that the first axial direction is formed.
- the radial length (width) R of the hole 331 and the second axial hole 332 is also limited to be small.
- the insulating member 33 in the present embodiment is formed by integrally molding a dielectric resin such as PBT or PET together with the outer peripheral side iron core 32 and the inner peripheral side iron core 34, the first axial direction hole 331 and the first Considering the draft of the mold at the time of molding the biaxial hole 332, the length (width) R in the radial direction of the first axial hole 331 and the second axial hole 332 cannot be increased.
- the axial thickness of the partition wall 323 (retaining portion) of the outer peripheral side iron core 32 and the axial thickness of the partition wall 344 (removing portion) of the inner peripheral side iron core 34 are set to the wall portion 333. Is approximately equal to the (axial) thickness of.
- the first axial hole 331 and the second axial hole 332 have a circumferential end face shape when viewed from the axial direction, as shown in FIGS. 6 to 9. It is formed in an arc shape along. That is, by making the length (width) R in the radial direction of the first axial hole 331 and the second axial hole 332 constant in the circumferential direction, the size of the hole can be increased in a limited space. Moreover, the capacitance of the rotor 3 can be reduced.
- the size and shape of the first axial hole 331 and the second axial hole 332 are determined in consideration of both the reduction of the capacitance of the rotor 3 and the securing of mechanical strength.
- the coefficient of linear expansion of resin is 10 times or more larger than the coefficient of linear expansion of metal. Therefore, in the resin insulating member 33, the amount of expansion when the temperature rises and the amount of contraction when the temperature drops are larger than those of the metal outer peripheral side iron core 32 and the inner peripheral side iron core 34.
- the side walls 335a and 335b of the insulating member 33 are thin in the radial direction and thick in the axial direction. Therefore, the amount of expansion and contraction of the side walls 335a and 335b of the insulating member 33 is larger in the axial direction than in the radial direction.
- the amount of expansion and contraction of the wall portion 333 and the partition wall 334 of the insulating member 33 are divided into a radial component and an axial component, but the radial expansion and contraction are performed on the outer peripheral side iron core 32 and the inner peripheral side. Since it is regulated by the iron core 34, the amount of expansion and contraction in the axial direction tends to be larger than the amount of expansion and contraction in the radial direction.
- the insulating member 33 sandwiched between the outer peripheral side iron core 32 and the inner peripheral side iron core 34 shown in FIGS. 7 and 8 is displaced in the axial direction (change in position) due to expansion or contraction. It varies depending on where it was in the axial direction before it contracted. That is, since the insulating member 33 expands or contracts in both axial directions with the central portion in the axial direction as a boundary, the displacement becomes larger as the insulating member 33 is farther from the central portion in the axial direction. For example, the central portion in the axial direction (near the wall portion 333) has almost no axial displacement before and after expansion. On the other hand, the axial end (near the end 335d) has a large axial displacement before and after expansion. Since the insulating member 33 has a small radial width and is restricted from expanding and contracting in the radial direction, the displacement in the radial direction due to the expansion and contraction is almost the same regardless of the axial position. Absent.
- thermal stress is likely to be concentrated in a portion where expansion or contraction in the radial direction is regulated by the outer peripheral side iron core 32 and the inner peripheral side iron core 34. Therefore, in the present embodiment, the thermal stress is concentrated on the wall portion 333 and the partition wall 334 of the insulating member 33.
- the amount of expansion in the axial direction tends to be larger than that in the radial direction.
- Thermal stress is particularly concentrated in places where expansion is regulated or where the amount of displacement is large.
- the thermal stress is concentrated on the portion where the wall portion 333 and the side walls 335a and 335b shown in FIG. 7 intersect, but the first axial direction hole 331 and the second axial direction hole 332 Since the (first recess) is provided, the force can be released to the first recess side, and the thermal stress can be relaxed.
- the thermal stress is concentrated on the axial ends of the side walls 335a and 335b, but the above-mentioned first recess is provided, so that the first recess side The force can be released and the thermal stress can be relieved.
- the expansion in the radial direction is restricted to the outer peripheral side iron core 32 and the inner peripheral side iron core 34, and the displacement amount due to the expansion near the axial end portion 335d becomes particularly large. .. Therefore, due to the influence of the expansion of the insulating member 33, the vicinity of the axial end portion 335d of the insulating member 33 that covers the inner and outer edges of the outer peripheral side iron core 32 and the inner peripheral side iron core 34 is particularly liable to crack.
- the insulating member 33 is provided between the first axial holes 331 and between the second axial holes 332, which are arranged in an annular shape, as shown in FIGS. 6 and 8.
- a third axial hole 336 is formed at one end in the axial direction, and a fourth axial hole 337 is similarly formed at the other end in the axial direction at a position between the two.
- the third axial hole 336 and the fourth axial hole 337 are the same as the first axial hole 331 and the second axial hole 332 (first recesses 331 and 332). It is formed on the circumference and is arranged in an annular shape.
- third axial hole 336 and fourth axial hole 337 are provided at equal intervals in the circumferential direction, similarly to the first axial hole 331 and the second axial hole 332 (for example,). 10) are formed. Further, each of the third axial hole 336 and the fourth axial hole 337 is arranged so as to overlap the partition wall 334 described above in the axial direction. Further, as shown in FIGS. 6 to 9, the third axial hole 336 and the fourth axial hole 337 are formed so that the end face shape when viewed from the axial direction is an arc shape along the circumferential direction.
- the third axial hole 336 and the fourth axial hole 337 are continuous with the first axial hole 331 and the second axial hole 332, so that the insulating member 33 has an annular recess on both end surfaces in the axial direction.
- a groove is formed. That is, when the first axial hole 331 and the second axial hole 332 are the first recesses, and the third axial hole 336 and the fourth axial hole 337 are the second recesses, the insulating member (connecting portion).
- An annular concave groove portions (331, 336, and 332, 337) formed in an annular shape are provided on both end faces in the axial direction of the 33.
- the bottom portion (position of the axial end portion of the partition wall 334) of the second recess (third axial hole 336, fourth axial hole 337) is a rotor core (outer peripheral side iron core 32 and inner peripheral side). It has been confirmed that the concentration of thermal stress in the insulating member 33 is suppressed when the iron core 34) is formed so as to be closer to the central portion in the axial direction than the end face in the axial direction. Based on this, in the present embodiment, the depth of the third axial hole 336 and the fourth axial hole 337 is formed so as to be 5.5 mm from the axial end face of the insulating member 33. On the other hand, the depth of the first axial hole 331 and the second axial hole 332 is formed so as to be 16.5 mm from the axial end face of the insulating member 33.
- the depths of the first axial hole 331 and the second axial hole 332 are M [mm]
- the third axial hole is M [mm]
- the depth of the 336 and the fourth axial hole 337 is S [mm]
- the axial length (core product thickness) of the outer peripheral side iron core 32 and the inner peripheral side iron core 34 is L [mm].
- the axial thickness (central wall thickness) of the wall portion 333 is C [mm].
- the region where the insulating member 33 has a large axial length is reduced, and the total volume of the insulating member 33 is reduced.
- the amount of expansion and contraction of the insulating member 33 in the axial direction can be reduced.
- the second recesses 336 and 337 are provided, the force applied to the vicinity of the axial end portion 335d can be released to the second recess side, the thermal stress is relaxed, and the thermal stress is concentrated. Can be suppressed. Therefore, it is possible to suppress a decrease in durability due to the concentration of thermal stress of the insulating member 33, and it is possible to suppress the occurrence of thermal cracks and cracks and extend the life.
- the plurality of third axial holes 336 are the plurality of first axial holes 331 (first recesses) arranged in an annular shape. It is arranged between the holes and is formed so as to connect the first axial holes 331 adjacent to each other in the circumferential direction.
- the plurality of fourth axial holes 337 are arranged between the plurality of second axial holes 332 (first recesses) arranged in an annular shape and have a circumference. It is formed so as to connect the second axial holes 332 adjacent to each other in the direction. As a result, the concentration of thermal stress can be suppressed.
- the depths of the third axial hole 336 and the fourth axial hole 337 are formed to be smaller (shallow) than the depths of the first axial hole 331 and the second axial hole 332.
- a partition wall 334 that partitions the second axial holes 332 between the first axial holes 331 adjacent to each other in the circumferential direction and between the second axial holes 332 adjacent to each other in the circumferential direction is provided. It can be formed, and the strength of the insulating member 33 (connecting portion) can be increased.
- the insulating member (connecting portion).
- An annular concave groove portions (331, 336, and 332, 337) formed in an annular shape are provided on both end faces in the axial direction of the 33.
- the side walls 335a and 335b can expand toward the annular concave groove in the radial direction, so that the influence of thermal stress is further mitigated and the insulating member 33 is thermally cracked. Can be prevented.
- the insulating member 33 thermally expands due to heat generated by the winding 23 of the stator 2 in the usage environment and the driving state of the permanent magnet electric motor 1 has been described. Not only that, but also around the bottom of the first axial hole 331 and the second axial hole 332 and around the end of the insulating member 33 during heat shrinkage when the temperature drops depending on the usage environment and driving state of the permanent magnet motor 1.
- the concentration of thermal stress can be relaxed.
- the insulating member 33 is provided with the first recesses 331 and 332 and the second recesses 336 and 337, and the thickness (and resin) of the insulating member 33 in the axial direction is provided. The volume) can be reduced, the stresses during thermal expansion and contraction can be reduced, and thermal cracking of the insulating member 33 can be prevented.
- the insulating member 33 is arranged on the rotor 3, and the insulating member 33 has the first axial hole 331 and the second axial direction.
- the concentration of thermal stress generated in the insulating member 33 which is a problem when the rotor 3 having a small diameter is manufactured, is alleviated. Can be made to.
- the permanent magnet electric motor 1 provided with the rotor 3 can also be miniaturized.
- the capacitance and durability of at least one of the first axial hole 331 and the second axial hole 332, or at least one of the third axial hole 336 and the fourth axial hole 337 may be attached.
- the end face shapes of the first axial hole 331 and the second axial hole 332 and the third axial hole 336 and the fourth axial hole 337 when viewed from the axial direction are circular.
- the shape of each axial hole is not limited to this.
- the number of the first axial hole 331 and the second axial hole 332 and the number of each of the third axial hole 336 and the fourth axial hole 337 are not limited to 10, but can be any number. can do.
- the first axial hole 331 and the second axial hole 332 are formed symmetrically with respect to the wall portion 333, but the present invention is not limited to this, and the first axial direction is not limited to this.
- the hole 331 and the second axial hole 332 may be formed in an asymmetrical shape (for example, C-shaped when viewed from the axial direction) with respect to the wall portion 333.
- the third axial hole 336 and the fourth axial hole 337 may be formed in an asymmetrical shape (for example, C-shaped when viewed from the axial direction) with respect to the wall portion 333.
- the present invention is applied to the surface magnet type rotor 3 in which the permanent magnet 31 is arranged on the outer peripheral surface of the outer peripheral side iron core 32 has been described, but the present invention is not limited thereto.
- the present invention can also be applied to an embedded magnet type rotor in which a slot extending in the axial direction is formed at a chord position with respect to the outer peripheral surface of the outer peripheral side iron core 32 and a permanent magnet is arranged in this slot.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
[Problem] To provide a rotor provided with an insulation member (connection part) that can prevent thermal cracking while maintaining strength. [Solution] A rotor 3 includes an outer peripheral-side iron core 32, an inner peripheral-side iron core 34, and an insulation member (connection part) 33 which connects the outer peripheral-side iron core and the inner peripheral-side iron core and is formed of an insulation resin. A plurality of first recess parts 331, 332 arranged in an annular shape and a plurality of second recess parts 336, 337 connecting the first recess parts 331, 332 adjacent to each other in the circumferential direction are provided on both end surfaces of the insulation member 33 in an axis O direction. The depths of the second recess parts 336, 337 are formed to be shallower than the depths of the first recess parts 331, 332.
Description
本発明は、絶縁部材を有する回転子およびその回転子を備えた電動機に関する。
The present invention relates to a rotor having an insulating member and an electric motor provided with the rotor.
従来の電動機には、回転磁界を発生させる固定子の内側に、永久磁石を有する回転子を回転可能に配置したインナーロータ型の永久磁石電動機が知られている。この永久磁石電動機は、例えば、空気調和機に搭載する送風ファンの回転駆動用として用いられる。
As a conventional electric motor, an inner rotor type permanent magnet electric motor in which a rotor having a permanent magnet is rotatably arranged inside a stator that generates a rotating magnetic field is known. This permanent magnet electric motor is used, for example, for rotationally driving a blower fan mounted on an air conditioner.
この永久磁石電動機は、高周波スイッチングを行うPWM方式のインバータで駆動する場合に、軸受の内輪と外輪の間に電位差(軸電圧)を生じる。この軸電圧が軸受内部の油膜の絶縁破壊電圧に達すると、軸受内部に電流が流れて軸受に電食を発生させる。この軸受の電食を防止するために、例えば、絶縁部材を有する回転子を備えたものが知られている(例えば、特許文献1参照)。
When this permanent magnet motor is driven by a PWM type inverter that performs high frequency switching, a potential difference (shaft voltage) is generated between the inner ring and the outer ring of the bearing. When this shaft voltage reaches the dielectric breakdown voltage of the oil film inside the bearing, a current flows inside the bearing and causes electrolytic corrosion in the bearing. In order to prevent electrolytic corrosion of this bearing, for example, one provided with a rotor having an insulating member is known (see, for example, Patent Document 1).
この回転子は、例えば、環状の永久磁石と、永久磁石の内径側に位置する環状の外周側鉄心と、外周側鉄心の内径側に位置する環状の内周側鉄心と、外周側鉄心と内周側鉄心の間に位置する絶縁部材と、内周側鉄心の中心軸の方向に貫通する貫通穴に固着されたシャフトを備えている。
The rotor includes, for example, an annular permanent magnet, an annular outer peripheral iron core located on the inner diameter side of the permanent magnet, an annular inner peripheral iron core located on the inner diameter side of the outer peripheral iron core, and an outer peripheral iron core and inner core. It includes an insulating member located between the peripheral cores and a shaft fixed to a through hole penetrating in the direction of the central axis of the inner core.
このような回転子の絶縁部材は、外周側鉄心と内周側鉄心を連結する連結部であり、例えば、外周側鉄心と内周側鉄心の間に充填された樹脂で形成されている。
The insulating member of such a rotor is a connecting portion that connects the outer peripheral side iron core and the inner peripheral side iron core, and is formed of, for example, a resin filled between the outer peripheral side iron core and the inner peripheral side iron core.
ところで、上述した軸受の電食は、永久磁石電動機をPWM方式のインバータで駆動すると、固定子の巻線の中性点電位が零にならず、コモンモード電圧と呼ばれる電圧が発生する。このコモンモード電圧は、スイッチングによる高周波成分が含まれるため、永久磁石電動機の内部の浮遊容量によって、軸受の外輪と内輪の間に軸電圧を発生させる。
By the way, in the electrolytic corrosion of the above-mentioned bearing, when the permanent magnet motor is driven by the PWM type inverter, the neutral point potential of the winding of the stator does not become zero, and a voltage called a common mode voltage is generated. Since this common mode voltage contains a high frequency component due to switching, an axial voltage is generated between the outer ring and the inner ring of the bearing due to the stray capacitance inside the permanent magnet motor.
コモンモード電圧は、固定子の巻線とシャフトの間の静電容量分布と、シャフトとインバータ駆動用回路基板の間の静電容量により、軸受の内輪側(シャフト側)の電位として分圧される。そして、コモンモード電圧は、固定子の巻線とブラケットの間の静電容量とブラケットとインバータ駆動用回路基板の間の静電容量により、軸受の外輪側(ブラケット側)の電位として分圧される。この軸受の内輪側と外輪側の電位差が軸電圧となる。
The common mode voltage is divided as the potential on the inner ring side (shaft side) of the bearing by the capacitance distribution between the stator winding and the shaft and the capacitance between the shaft and the inverter drive circuit board. To. Then, the common mode voltage is divided as a potential on the outer ring side (bracket side) of the bearing by the capacitance between the winding of the stator and the bracket and the capacitance between the bracket and the circuit board for driving the inverter. To. The potential difference between the inner ring side and the outer ring side of this bearing is the shaft voltage.
回転子の絶縁部材の厚みの上限が構造上規制され、且つ材料として絶縁性樹脂(例えばPBT樹脂)を使用しても回転子側(軸受内輪側)のインピーダンスが低く、軸電圧が高い場合に、軸電圧を抑制するため、特許文献1に記載の先行技術では、絶縁部材の一部に空気層や空孔を形成するようにしている。空気の比誘電率は、ほぼ1であるため、3程度のPBTに比べて比誘電率が小さい(即ち、空気は絶縁性樹脂よりも絶縁性が高い)。したがって、空気層や空孔を設けることによって回転子の静電容量を小さくすることが可能となり、回転子側(軸受内輪側)のインピーダンスを高くするようにしている。
When the upper limit of the thickness of the insulating member of the rotor is structurally restricted, and even if an insulating resin (for example, PBT resin) is used as the material, the impedance on the rotor side (bearing inner ring side) is low and the shaft voltage is high. In order to suppress the shaft voltage, in the prior art described in Patent Document 1, an air layer or a hole is formed in a part of the insulating member. Since the relative permittivity of air is about 1, the relative permittivity is smaller than that of PBT of about 3 (that is, air has higher insulating property than the insulating resin). Therefore, it is possible to reduce the capacitance of the rotor by providing an air layer and vacancies, and to increase the impedance on the rotor side (bearing inner ring side).
しかしながら、特許文献1に記載された、絶縁部材に空気層を形成するための空孔を、多数形成する場合には、絶縁部材の強度が低下するおそれがあった。
その一方で、永久磁石電動機の使用環境や駆動時の固定子巻線からの発熱によって、絶縁部材に熱応力が生じる。熱応力が絶縁部材の一部に集中すると、絶縁部材の耐久性の低下や割れやクラックの発生が懸念される。この熱応力を緩和することも望まれていた。 However, when a large number of holes for forming an air layer are formed in the insulating member described inPatent Document 1, the strength of the insulating member may decrease.
On the other hand, thermal stress is generated in the insulating member due to the usage environment of the permanent magnet motor and the heat generated from the stator winding during driving. If the thermal stress is concentrated on a part of the insulating member, there is a concern that the durability of the insulating member may be lowered and cracks or cracks may occur. It was also desired to relieve this thermal stress.
その一方で、永久磁石電動機の使用環境や駆動時の固定子巻線からの発熱によって、絶縁部材に熱応力が生じる。熱応力が絶縁部材の一部に集中すると、絶縁部材の耐久性の低下や割れやクラックの発生が懸念される。この熱応力を緩和することも望まれていた。 However, when a large number of holes for forming an air layer are formed in the insulating member described in
On the other hand, thermal stress is generated in the insulating member due to the usage environment of the permanent magnet motor and the heat generated from the stator winding during driving. If the thermal stress is concentrated on a part of the insulating member, there is a concern that the durability of the insulating member may be lowered and cracks or cracks may occur. It was also desired to relieve this thermal stress.
そこで、本発明は、強度を保ちつつ熱割れを防止できる絶縁部材を有する回転子およびその回転子を備えた電動機を提供することを目的としている。
Therefore, an object of the present invention is to provide a rotor having an insulating member capable of preventing thermal cracking while maintaining strength, and an electric motor provided with the rotor.
上記課題を解決するために、本発明の回転子の一態様は、外周側鉄心と、内周側鉄心と、外周側鉄心と内周側鉄心を連結する連結部とを備える。連結部は、絶縁性樹脂で形成される。連結部の軸方向の両端面には、環状に配置された複数の第1の凹部と、円周方向に隣り合う第1の凹部同士を繋ぐ複数の第2の凹部とが設けられる。第2の凹部の深さは、第1の凹部の深さよりも浅く形成される。
In order to solve the above problems, one aspect of the rotor of the present invention includes an outer peripheral side iron core, an inner peripheral side iron core, and a connecting portion for connecting the outer peripheral side iron core and the inner peripheral side iron core. The connecting portion is formed of an insulating resin. A plurality of first recesses arranged in an annular shape and a plurality of second recesses connecting the first recesses adjacent to each other in the circumferential direction are provided on both end faces in the axial direction of the connecting portion. The depth of the second recess is formed shallower than the depth of the first recess.
本発明の電動機の一態様は、モータ外郭に固定された固定子と、固定子の内径側に配置された回転子とを備える。回転子は、永久磁石が固定される環状の外周側鉄心と、外周側鉄心の内径側に位置する内周側鉄心と、外周側鉄心と内周側鉄心の間に位置し、絶縁性樹脂で形成された連結部と、内周側鉄心に連結されるとともに、モータ外郭に軸受によって回転自在に支持されたシャフトとを備える。回転子は、連結部の軸方向の両端面に、環状に配置された複数の第1の凹部と、円周方向に隣り合う第1の凹部同士を繋ぐ複数の第2の凹部とが設けられる。第2の凹部の深さは、第1の凹部の深さよりも浅く形成される。
One aspect of the electric motor of the present invention includes a stator fixed to the outer shell of the motor and a rotor arranged on the inner diameter side of the stator. The rotor is made of an insulating resin, which is located between the annular outer peripheral side iron core to which the permanent magnet is fixed, the inner peripheral side iron core located on the inner diameter side of the outer peripheral side iron core, and the outer peripheral side iron core and the inner peripheral side iron core. It is provided with a formed connecting portion and a shaft that is connected to an iron core on the inner peripheral side and is rotatably supported by a bearing on the outer shell of the motor. The rotor is provided with a plurality of first recesses arranged in an annular shape and a plurality of second recesses connecting the first recesses adjacent to each other in the circumferential direction on both end faces in the axial direction of the connecting portion. .. The depth of the second recess is formed shallower than the depth of the first recess.
本発明によれば、絶縁性樹脂で形成された連結部の強度を保ちつつ熱割れを防止することができる。
According to the present invention, it is possible to prevent thermal cracking while maintaining the strength of the connecting portion formed of the insulating resin.
次に、図面を参照して、本発明の一実施形態について説明する。以下の図面の記載において、同一又は類似の部分には同一又は類似の符号を付している。但し、図面は模式的なものであり、現実のものとは必ずしも一致しないことに留意すべきである。したがって、具体的な構成部品については以下の説明を参酌して判断すべきものである。
Next, an embodiment of the present invention will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic and do not necessarily match the actual ones. Therefore, the specific components should be judged in consideration of the following explanation.
また、以下に示す実施形態は、本発明の技術的思想を具体化するための装置や方法を例示するものであって、本発明の技術的思想は、構成部品の形状、構造、配置等を下記のものに特定するものでない。本発明の技術的思想は、特許請求の範囲に記載された請求項が規定する技術的範囲内において、種々の変更を加えることができる。
Further, the embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention describes the shape, structure, arrangement, etc. of components. It is not specific to the following. The technical idea of the present invention may be modified in various ways within the technical scope specified by the claims stated in the claims.
以下に、本発明の一実施形態に係る電動機について説明する。
The electric motor according to the embodiment of the present invention will be described below.
<電動機の全体構成>
図1乃至図12は、第1実施形態における電動機1の構成を説明する図である。これらの図に示すように、この永久磁石電動機1は、例えば、ブラシレスDCモータである。この電動機1は、図13に示すような空気調和機の室外機10に搭載される送風ファンを回転駆動するために用いられる。空気調和機の室外機10は、例えば、室外機10のベース101にねじ留めされる底板102と、室外機10の上部に固定される上板103と、電動機1が取り付けられる台座104と、底板102と上板103と台座104とが固定される2本の支柱105とを備える。電動機1は、台座104の中央部にねじ留めされる。 <Overall configuration of the motor>
1 to 12 are views for explaining the configuration of theelectric motor 1 according to the first embodiment. As shown in these figures, the permanent magnet electric motor 1 is, for example, a brushless DC motor. The electric motor 1 is used to rotationally drive the blower fan mounted on the outdoor unit 10 of the air conditioner as shown in FIG. The outdoor unit 10 of the air conditioner includes, for example, a bottom plate 102 screwed to the base 101 of the outdoor unit 10, an upper plate 103 fixed to the upper part of the outdoor unit 10, a pedestal 104 to which the electric motor 1 is attached, and a bottom plate. It is provided with two columns 105 to which the 102, the upper plate 103, and the pedestal 104 are fixed. The electric motor 1 is screwed to the central portion of the pedestal 104.
図1乃至図12は、第1実施形態における電動機1の構成を説明する図である。これらの図に示すように、この永久磁石電動機1は、例えば、ブラシレスDCモータである。この電動機1は、図13に示すような空気調和機の室外機10に搭載される送風ファンを回転駆動するために用いられる。空気調和機の室外機10は、例えば、室外機10のベース101にねじ留めされる底板102と、室外機10の上部に固定される上板103と、電動機1が取り付けられる台座104と、底板102と上板103と台座104とが固定される2本の支柱105とを備える。電動機1は、台座104の中央部にねじ留めされる。 <Overall configuration of the motor>
1 to 12 are views for explaining the configuration of the
以下では、回転磁界を発生する固定子2の内周側に、永久磁石31を有する回転子3を回転可能に配置したインナーロータ型の永久磁石電動機1を例に説明する。本実施形態における永久磁石電動機1は、固定子2と、回転子3と、モータ外郭6を備えている。
In the following, an inner rotor type permanent magnet motor 1 in which a rotor 3 having a permanent magnet 31 is rotatably arranged on the inner peripheral side of the stator 2 that generates a rotating magnetic field will be described as an example. The permanent magnet electric motor 1 in the present embodiment includes a stator 2, a rotor 3, and a motor outer shell 6.
<固定子と回転子>
固定子2は、円筒形状のヨーク部とヨーク部から内径側に延びる複数のティース部を有した固定子鉄心21と、インシュレータ22を介してティース部に巻回された巻線23を備えている。この固定子2は、固定子鉄心21の内周面を除いて、樹脂で形成されたモータ外郭6で覆われている。 <Stator and rotor>
Thestator 2 includes a stator core 21 having a cylindrical yoke portion and a plurality of teeth portions extending from the yoke portion to the inner diameter side, and a winding 23 wound around the teeth portion via an insulator 22. .. The stator 2 is covered with a motor outer shell 6 made of resin, except for the inner peripheral surface of the stator core 21.
固定子2は、円筒形状のヨーク部とヨーク部から内径側に延びる複数のティース部を有した固定子鉄心21と、インシュレータ22を介してティース部に巻回された巻線23を備えている。この固定子2は、固定子鉄心21の内周面を除いて、樹脂で形成されたモータ外郭6で覆われている。 <Stator and rotor>
The
回転子3は、固定子2の固定子鉄心21の内周側に所定の空隙(ギャップ)を持って回転自在に配置されている。この回転子3は、固定子鉄心21に対向する外周面に環状に永久磁石31を配置した表面磁石型である。永久磁石31は、後述する外周側鉄心32の外周面に固定されている。このシャフト35は、内周側鉄心34に連結されており、回転子2で生じた動力がシャフト35を介して負荷(送風ファン)へと伝達され、送風ファンを回転駆動するようになっている。また、シャフト35は、第1軸受41および第2軸受42によって支持され、第1軸受41が第1ブラケット51に、第2軸受42が第2ブラケット52にそれぞれ支持されることで、回転子3が回転自在に支持されている。
The rotor 3 is rotatably arranged with a predetermined gap on the inner peripheral side of the stator core 21 of the stator 2. The rotor 3 is a surface magnet type in which permanent magnets 31 are arranged in an annular shape on the outer peripheral surface facing the stator core 21. The permanent magnet 31 is fixed to the outer peripheral surface of the outer peripheral side iron core 32, which will be described later. The shaft 35 is connected to the inner peripheral side iron core 34, and the power generated by the rotor 2 is transmitted to the load (blower fan) via the shaft 35 to rotationally drive the blower fan. .. Further, the shaft 35 is supported by the first bearing 41 and the second bearing 42, the first bearing 41 is supported by the first bracket 51, and the second bearing 42 is supported by the second bracket 52, whereby the rotor 3 is supported. Is rotatably supported.
<軸受とブラケット>
第1軸受41は、回転子3のシャフト35の一端側(出力側)を支持している。第2軸受42は、回転子3のシャフト35の他端側(反出力側)を支持している。第1軸受41および第2軸受42は、例えば、ボールベアリングが用いられる。 <Bearings and brackets>
Thefirst bearing 41 supports one end side (output side) of the shaft 35 of the rotor 3. The second bearing 42 supports the other end side (counter-output side) of the shaft 35 of the rotor 3. As the first bearing 41 and the second bearing 42, for example, ball bearings are used.
第1軸受41は、回転子3のシャフト35の一端側(出力側)を支持している。第2軸受42は、回転子3のシャフト35の他端側(反出力側)を支持している。第1軸受41および第2軸受42は、例えば、ボールベアリングが用いられる。 <Bearings and brackets>
The
第1ブラケット51は、金属製(鋼板やアルミニウムなど)であり、モータ外郭6の一端側すなわちシャフト35の出力側に配置されている。この第1ブラケット51は、第1軸受41を収容するための第1軸受収容部511と、第1軸受収容部511の開放端から周りに広がるフランジ部512を有する。第1軸受収容部511は、シャフト35を通すための貫通穴が設けられた底部を有する円筒形状に形成されており、第1ブラケット51のフランジ部512は、モータ外郭6の成形時にインサート成形され、モータ外郭6と一体になっている。
The first bracket 51 is made of metal (steel plate, aluminum, etc.) and is arranged on one end side of the motor outer shell 6, that is, on the output side of the shaft 35. The first bracket 51 has a first bearing accommodating portion 511 for accommodating the first bearing 41, and a flange portion 512 extending around from the open end of the first bearing accommodating portion 511. The first bearing accommodating portion 511 is formed in a cylindrical shape having a bottom portion provided with a through hole for passing the shaft 35, and the flange portion 512 of the first bracket 51 is insert-molded at the time of molding the motor outer shell 6. , It is integrated with the motor outer shell 6.
この第1軸受収容部511の内面に第1軸受41の外輪が圧入され、この第1軸受41の内輪に支持されたシャフト35の出力側が、第1軸受収容部511の底部の中央に形成された貫通穴から外部に突出されている。
The outer ring of the first bearing 41 is press-fitted into the inner surface of the first bearing accommodating portion 511, and the output side of the shaft 35 supported by the inner ring of the first bearing 41 is formed in the center of the bottom portion of the first bearing accommodating portion 511. It protrudes to the outside from the through hole.
第2ブラケット52は、金属製(鋼板やアルミニウムなど)であり、モータ外郭6の他端側すなわちシャフト35の反出力側に固定されている。この第2ブラケット52は、円板状のブラケット本体部521と、モータ外郭6の反出力側の端部を閉塞する外縁部520と、第2軸受42を収容するための第2軸受収容部522とを有する。
The second bracket 52 is made of metal (steel plate, aluminum, etc.) and is fixed to the other end side of the motor outer shell 6, that is, the counter-output side of the shaft 35. The second bracket 52 includes a disc-shaped bracket main body 521, an outer edge portion 520 that closes an end portion of the motor outer shell 6 on the opposite output side, and a second bearing accommodating portion 522 for accommodating the second bearing 42. And have.
第2ブラケット52は、外縁部520がモータ外郭6の反出力側の端部にねじ留めされている。第2軸受収容部522は、ブラケット本体部521の中央部に、モータ外郭6側(出力側)から凹設された円形の底面を有する穴として形成されている。
The outer edge 520 of the second bracket 52 is screwed to the end of the motor outer shell 6 on the opposite output side. The second bearing accommodating portion 522 is formed as a hole having a circular bottom surface recessed from the motor outer shell 6 side (output side) in the central portion of the bracket main body portion 521.
第1軸受41は、第1ブラケット51に設けられた第1軸受収容部511に収容され、第2軸受42は、第2ブラケット52に設けられた第2軸受収容部522に収容されている。そして、第1軸受41と第1軸受収容部511、第2軸受42と第2軸受収容部522はそれぞれ電気的に導通している。
The first bearing 41 is housed in the first bearing accommodating portion 511 provided in the first bracket 51, and the second bearing 42 is accommodated in the second bearing accommodating portion 522 provided in the second bracket 52. The first bearing 41 and the first bearing accommodating portion 511, and the second bearing 42 and the second bearing accommodating portion 522 are electrically conductive, respectively.
第2ブラケット52は、径方向において第2軸受収容部522と外縁部520との間にヒートシンクを一体的に備える。これにより、電動機1の省スペース化を図ることができる。
第2ブラケットは、ヒートシンクとして、シャフト35の反出力側に、外方へ向けて立設した放熱フィン523を備え、伝熱部材71を介し、電動機1を制御するための回路基板72(特に、回路基板72に搭載された電子部品721)からの熱が、放熱フィン523によって効率的に放熱されるようになっている。 The second bracket 52 integrally includes a heat sink between the second bearing accommodating portion 522 and theouter edge portion 520 in the radial direction. As a result, the space of the electric motor 1 can be saved.
The second bracket is provided withheat radiation fins 523 erected outward on the opposite output side of the shaft 35 as a heat sink, and is a circuit board 72 for controlling the electric motor 1 via a heat transfer member 71 (particularly, The heat from the electronic component 721) mounted on the circuit board 72 is efficiently dissipated by the heat radiating fins 523.
第2ブラケットは、ヒートシンクとして、シャフト35の反出力側に、外方へ向けて立設した放熱フィン523を備え、伝熱部材71を介し、電動機1を制御するための回路基板72(特に、回路基板72に搭載された電子部品721)からの熱が、放熱フィン523によって効率的に放熱されるようになっている。 The second bracket 52 integrally includes a heat sink between the second bearing accommodating portion 522 and the
The second bracket is provided with
<本発明に係る回転子の構造、作用および効果>
次に、本実施形態における永久磁石電動機1において、図2乃至図10を用いて、本発明に係る回転子3の構造やその作用および効果について説明する。
永久磁石電動機1では、第1軸受41や第2軸受42に電食が生じないようにするため、図1に示すように、回転子3の一部に絶縁部材33を備えている。以下、回転子3の具体的構成について説明する。 <Structure, action and effect of rotor according to the present invention>
Next, in the permanent magnetelectric motor 1 of the present embodiment, the structure of the rotor 3 according to the present invention, its action and effect will be described with reference to FIGS. 2 to 10.
In the permanent magnetelectric motor 1, as shown in FIG. 1, an insulating member 33 is provided in a part of the rotor 3 in order to prevent electrolytic corrosion in the first bearing 41 and the second bearing 42. Hereinafter, a specific configuration of the rotor 3 will be described.
次に、本実施形態における永久磁石電動機1において、図2乃至図10を用いて、本発明に係る回転子3の構造やその作用および効果について説明する。
永久磁石電動機1では、第1軸受41や第2軸受42に電食が生じないようにするため、図1に示すように、回転子3の一部に絶縁部材33を備えている。以下、回転子3の具体的構成について説明する。 <Structure, action and effect of rotor according to the present invention>
Next, in the permanent magnet
In the permanent magnet
回転子3は、図1乃至図11に示すように、外径側から内径側に向かって、永久磁石31と、外周側鉄心32と、絶縁部材(連結部)33と、内周側鉄心34と、シャフト35を備えている。
As shown in FIGS. 1 to 11, the rotor 3 has a permanent magnet 31, an outer peripheral side iron core 32, an insulating member (connecting portion) 33, and an inner peripheral side iron core 34 from the outer diameter side to the inner diameter side. And the shaft 35 is provided.
永久磁石31は、図1,11及び図12に示すように、N極とS極が円周方向に等間隔に交互に表れるように複数(例えば8または10個)の永久磁石片311で環状に形成されている。なお、永久磁石31は、磁石粉末を樹脂で固めることで環状に形成されたプラスチックマグネットを用いてもよい。
As shown in FIGS. 1, 11 and 12, the permanent magnet 31 is annular with a plurality of (for example, 8 or 10) permanent magnet pieces 311 so that the north and south poles appear alternately at equal intervals in the circumferential direction. Is formed in. As the permanent magnet 31, a plastic magnet formed in an annular shape by solidifying the magnet powder with a resin may be used.
外周側鉄心32は、図2に示すように、環状に形成されており、図11および図12に示すように、永久磁石31の内径側に位置している。外周側鉄心32には、後述する絶縁部材33との回り止めの機能を確保するために、内周面(図2参照)から外径側に凹み、回転子3の軸Oの方向(以下、軸方向)に延びた複数(例えば円周方向に5個)の内周側凹部321を備えている。すなわち、内周側凹部321が、絶縁部材33に対する回り止めを行うキー溝(回転する部材との間での滑りを防止する溝。キー溝により部材間の締結力が向上し、動力の伝達効率を高めることができる)として機能する。さらに外周側鉄心32には、永久磁石31の位置決めをするために、外周面から外径側に突出する複数(例えば円周方向に10個)の外周側突起322を備えている。
The outer peripheral side iron core 32 is formed in an annular shape as shown in FIG. 2, and is located on the inner diameter side of the permanent magnet 31 as shown in FIGS. 11 and 12. The outer peripheral side iron core 32 is recessed from the inner peripheral surface (see FIG. 2) to the outer diameter side in order to secure the function of preventing rotation with the insulating member 33 described later, and the direction of the axis O of the rotor 3 (hereinafter, hereinafter, It is provided with a plurality of (for example, five in the circumferential direction) inner peripheral side recesses 321 extending in the axial direction. That is, the inner peripheral side recess 321 is a key groove that prevents rotation of the insulating member 33 (a groove that prevents slipping between the insulating member 33. The key groove improves the fastening force between the members and improves power transmission efficiency. Can be enhanced). Further, the outer peripheral side iron core 32 is provided with a plurality of outer peripheral side protrusions 322 (for example, 10 in the circumferential direction) protruding from the outer peripheral surface to the outer diameter side in order to position the permanent magnet 31.
複数の内周側凹部321は、絶縁部材33の端面から軸方向に延びるとともに、円周方向に等間隔に配置されている。本実施形態では、内周側凹部321は、軸方向において、外周側鉄心32の両端部からそれぞれ延びるように2個配置される。これにより、外周側鉄心32は、軸方向に隣接する内周側凹部321同士の間に隔壁323(抜止部)が存在し、この隔壁323によって絶縁部材33(連結部)の(両軸方向への)抜け止めを行うことができる。
The plurality of inner peripheral side recesses 321 extend in the axial direction from the end face of the insulating member 33 and are arranged at equal intervals in the circumferential direction. In the present embodiment, two inner peripheral side recesses 321 are arranged so as to extend from both ends of the outer peripheral side iron core 32 in the axial direction. As a result, the outer peripheral side iron core 32 has a partition wall 323 (retaining portion) between the inner peripheral side recesses 321 adjacent to each other in the axial direction, and the partition wall 323 causes the insulating member 33 (connecting portion) (in both axial directions). ) Can be prevented from coming off.
複数の外周側突起322は、それぞれ軸方向に延びるとともに、円周方向に等間隔に配置されている。また、各々の外周側突起322は、軸方向において、外周側鉄心32の一端から他端まで延びるように配置される。
The plurality of outer peripheral protrusions 322 extend in the axial direction and are arranged at equal intervals in the circumferential direction. Further, each outer peripheral side protrusion 322 is arranged so as to extend from one end to the other end of the outer peripheral side iron core 32 in the axial direction.
内周側鉄心34は、図3に示すように、環状に形成されており、図5乃至図10に示すように、外周側鉄心32の内径側に位置している。内周側鉄心34には、後述する絶縁部材33との回り止めの機能を確保するために、外周面(図3参照)から内径側に凹み、軸方向に延びた複数(例えば円周方向に6個)の外周側凹部341を備えている。すなわち、外周側凹部341が、絶縁部材33に対する回り止めを行うキー溝として機能する。
The inner peripheral side iron core 34 is formed in an annular shape as shown in FIG. 3, and is located on the inner diameter side of the outer peripheral side iron core 32 as shown in FIGS. 5 to 10. The inner peripheral side iron core 34 is recessed from the outer peripheral surface (see FIG. 3) toward the inner diameter side and extends in the axial direction (for example, in the circumferential direction) in order to secure the function of preventing rotation with the insulating member 33 described later. 6) outer peripheral side recesses 341 are provided. That is, the outer peripheral side recess 341 functions as a key groove for preventing rotation of the insulating member 33.
複数の外周側凹部341は、軸方向に延びるとともに円周方向に等間隔に配置されている。本実施形態では、外周側凹部341は、軸方向の中央に配置される隔壁344(抜止部)により区画されている。そのため、外周側凹部341は、内周側鉄心34の両端部からそれぞれ延びるように2個配置される。これにより、内周側鉄心34は、軸方向に隣接する外周側凹部341同士の間に隔壁344が存在し、この隔壁344(抜止部)によって絶縁部材33(連結部)の(両軸方向への)抜け止めを行うことができる。
The plurality of outer peripheral side recesses 341 extend in the axial direction and are arranged at equal intervals in the circumferential direction. In the present embodiment, the outer peripheral side recess 341 is partitioned by a partition wall 344 (retaining portion) arranged at the center in the axial direction. Therefore, two outer peripheral side recesses 341 are arranged so as to extend from both end portions of the inner peripheral side iron core 34. As a result, the inner peripheral side iron core 34 has a partition wall 344 between the outer peripheral side recesses 341 adjacent to each other in the axial direction, and the partition wall 344 (removal portion) of the insulating member 33 (connecting portion) (in both axial directions). ) Can be prevented from coming off.
そして、内周側鉄心34の中心には、軸方向に貫通する貫通穴343を備えている。内周側鉄心34の貫通穴343にはシャフト35が通され、シャフト35と内周側鉄心34とが連結される。なお、内周側鉄心34は、この貫通穴343と内周側鉄心34の外周面との間に、重量を軽くするための肉抜き用の複数の貫通穴342を備えてもよい。これらの複数の貫通穴342は、軸方向から見て、貫通穴342が形成された内周側鉄心34の形状がスポーク状になるように、円周方向に等間隔に配置されている。
And, at the center of the inner peripheral side iron core 34, a through hole 343 penetrating in the axial direction is provided. A shaft 35 is passed through a through hole 343 of the inner peripheral side iron core 34, and the shaft 35 and the inner peripheral side iron core 34 are connected to each other. The inner peripheral side iron core 34 may be provided with a plurality of through holes 342 for lightening the weight between the through hole 343 and the outer peripheral surface of the inner peripheral side iron core 34. These plurality of through holes 342 are arranged at equal intervals in the circumferential direction so that the shape of the inner peripheral side iron core 34 in which the through holes 342 are formed becomes a spoke shape when viewed from the axial direction.
絶縁部材33は、PBT(ポリブチレンテレフタレート)やPET(ポリエチレンテレフタレート)などの誘電体の樹脂で形成されており、外周側鉄心32と内周側鉄心34の間に位置している。絶縁部材33は、外周側鉄心32と内周側鉄心34の間に樹脂が充填されるインサート成形により、外周側鉄心32と内周側鉄心34と一体に成形されている。この絶縁部材33は、外周側鉄心32と内周側鉄心34の間の静電容量(固定子2の巻線23とシャフト35の間の静電容量の一部)を小さくしており、第1軸受41および第2軸受42の内輪側の電位を下げることで内輪側と外輪側の電位差が小さくなるよう調整されている。
The insulating member 33 is made of a dielectric resin such as PBT (polybutylene terephthalate) or PET (polyethylene terephthalate), and is located between the outer peripheral side iron core 32 and the inner peripheral side iron core 34. The insulating member 33 is integrally formed with the outer peripheral side iron core 32 and the inner peripheral side iron core 34 by insert molding in which a resin is filled between the outer peripheral side iron core 32 and the inner peripheral side iron core 34. The insulating member 33 has a small capacitance between the outer peripheral side iron core 32 and the inner peripheral side iron core 34 (a part of the capacitance between the winding 23 of the stator 2 and the shaft 35). By lowering the potential on the inner ring side of the 1st bearing 41 and the 2nd bearing 42, the potential difference between the inner ring side and the outer ring side is adjusted to be small.
図4に示すように、絶縁部材33は、外周面に、上述した外周側鉄心32の内周側凹部321と係合する(複数の)外周側凸部338を備える。また、絶縁部材33は、内周面に、内周側鉄心34の外周側凹部341と係合する(複数の)内周側凸部339を備える。
As shown in FIG. 4, the insulating member 33 includes (plural) outer peripheral side convex portions 338 on the outer peripheral surface that engage with the inner peripheral side concave portion 321 of the outer peripheral side iron core 32 described above. Further, the insulating member 33 includes (plural) inner peripheral side convex portions 339 that engage with the outer peripheral side concave portions 341 of the inner peripheral side iron core 34 on the inner peripheral surface.
ここで、外周側鉄心32と絶縁部材(連結部)33との間に設けられ、外周側鉄心32と絶縁部材33との間での回り止めを行う係合部(内周側凹部321および外周側凸部338)を第1の凹凸係合部とし、絶縁部材33と内周側鉄心34との間に設けられ、絶縁部材33と内周側鉄心34との間での回り止めを行う係合部(内周側凸部339および外周側凹部341)を第2の凹凸係合部と呼ぶこととする。上述のように、本実施形態では、外周側鉄心32および内周側鉄心34に、凹凸係合部(第1の凹凸係合部および第2の凹凸係合部)の凹部を形成し、絶縁部材(連結部)33に、凹凸係合部の凸部を形成した場合を例示した。
Here, an engaging portion (inner peripheral side recess 321 and outer peripheral side recess 321) provided between the outer peripheral side iron core 32 and the insulating member (connecting portion) 33 to prevent rotation between the outer peripheral side iron core 32 and the insulating member 33. The side convex portion 338) is used as the first concave-convex engaging portion, and is provided between the insulating member 33 and the inner peripheral side iron core 34 to prevent rotation between the insulating member 33 and the inner peripheral side iron core 34. The joint portion (inner peripheral side convex portion 339 and outer peripheral side concave portion 341) is referred to as a second uneven engagement portion. As described above, in the present embodiment, the outer peripheral side iron core 32 and the inner peripheral side iron core 34 are formed with recesses of the concave-convex engaging portion (the first concave-convex engaging portion and the second concave-convex engaging portion) to insulate. An example is shown in which a convex portion of the concave-convex engaging portion is formed on the member (connecting portion) 33.
なお、凹凸係合部における凹部と凸部のそれぞれを、回転子鉄心(32、34)と絶縁部材33のどちらに配置するかは、上述の場合と逆になってもよい。例えば、凹凸係合部の凸部を、外周側鉄心32および内周側鉄心34に設け、凹凸係合部の凹部を、絶縁部材33に設けてもよい。
It should be noted that whether the concave portion and the convex portion of the concave-convex engaging portion are arranged on the rotor core (32, 34) or the insulating member 33 may be reversed from the above-mentioned case. For example, the convex portion of the concave-convex engaging portion may be provided on the outer peripheral side iron core 32 and the inner peripheral side iron core 34, and the concave portion of the concave-convex engaging portion may be provided on the insulating member 33.
この第1の凹凸係合部321、338および第2の凹凸係合部339、341は、図2~4及び図7、8に示されるように、軸方向において隣接する内周側凹部321同士の間に隔壁323(抜止部)が形成され、軸方向において隣接する外周側凹部341同士の間に隔壁344(抜止部)が形成されているため、外周側鉄心32および内周側鉄心34に対する絶縁部材33の抜け止めを行うことができる。よって、上述のように、第1の凹凸係合部321、338および第2の凹凸係合部339、341は、各凹凸の係合で回り止めと抜け止めの機能を併せ持つことができる。
As shown in FIGS. 2 to 4 and 7 and 8, the first concave-convex engaging portions 321 and 338 and the second concave-convex engaging portions 339 and 341 have inner peripheral recesses 321 adjacent to each other in the axial direction. Since the partition wall 323 (retaining portion) is formed between the two, and the partition wall 344 (removing portion) is formed between the outer peripheral side recesses 341 adjacent to each other in the axial direction, the outer peripheral side iron core 32 and the inner peripheral side iron core 34 are formed. The insulating member 33 can be prevented from coming off. Therefore, as described above, the first concavo-convex engaging portion 321 and 338 and the second concavo-convex engaging portion 339 and 341 can have both a rotation preventing function and a retaining function by engaging each of the unevenness.
ここで、回転子3の回転時に、キー(回転体を軸に締結する機械要素)として機能する凹凸係合部が受けるせん断応力について考える。大きさがT[N・m]のトルクを伝達する軸において、凹凸係合部(キー)が配置される位置が中心軸Oから半径r[m]の位置とすると、凹凸係合部の形状が一様であると仮定したときに凹凸係合部に働くせん断応力τ[Pa]は、τ=α×T/r(α:比例定数)で表すことができる。また、外周側鉄心32と絶縁部材33との間に設けられた第1の凹凸係合部の径方向位置(すなわち外周側鉄心32の内径)r1と、絶縁部材33と内周側鉄心34との間に設けられた第2の凹凸係合部の径方向位置(すなわち内周側鉄心34の外径)r2とを比較すると、常にr1>r2が成り立つ。さらに、外周側鉄心32と絶縁部材33の間で伝達されるトルクと、絶縁部材33と内周側鉄心34の間で伝達されるトルクは等しいと見做すことができる。そのため、外径側の部材間(外周側鉄心32と絶縁部材33との間の第1の凹凸係合部)に働くせん断応力τ1よりも、内径側の部材間(内周側鉄心34と絶縁部材33の間の第2の凹凸係合部)に働くせん断応力τ2の方が、常に大きくなる(すなわち常にτ1<τ2が成り立つ)。そこで、円周方向における第2の凹凸係合部339、341の個数を、円周方向における第1の凹凸係合部321、338の個数よりも多くすることで、内径側の部材間に設けられた個々の第1の凹凸係合部321、338に働くせん断応力を小さくし、絶縁部材33の回り止めをさらに強固にすることができる。
Here, consider the shear stress received by the concave-convex engaging portion that functions as a key (a mechanical element that fastens the rotating body to the shaft) when the rotor 3 rotates. Assuming that the position where the concave-convex engaging portion (key) is arranged is the position of the radius r [m] from the central axis O on the shaft for transmitting the torque having a size of T [Nm], the shape of the concave-convex engaging portion. The shear stress τ [Pa] acting on the concave-convex engaging portion when it is assumed that is uniform can be expressed by τ = α × T / r (α: proportionality constant). Further, the radial position (that is, the inner diameter of the outer peripheral side iron core 32) r1 of the first concave-convex engaging portion provided between the outer peripheral side iron core 32 and the insulating member 33, and the insulating member 33 and the inner peripheral side iron core 34. Comparing with the radial position (that is, the outer diameter of the inner peripheral side iron core 34) r2 of the second uneven engagement portion provided between the two, r1> r2 always holds. Further, it can be considered that the torque transmitted between the outer peripheral side iron core 32 and the insulating member 33 and the torque transmitted between the insulating member 33 and the inner peripheral side iron core 34 are equal. Therefore, it is insulated between the members on the inner diameter side (insulated from the inner peripheral side iron core 34) than the shear stress τ1 acting between the members on the outer diameter side (the first uneven engagement portion between the outer peripheral side iron core 32 and the insulating member 33). The shear stress τ2 acting on the second concave-convex engaging portion between the members 33 is always larger (that is, τ1 <τ2 always holds). Therefore, by increasing the number of the second concave-convex engaging portions 339 and 341 in the circumferential direction to be larger than the number of the first concave-convex engaging portions 321 and 338 in the circumferential direction, they are provided between the members on the inner diameter side. The shear stress acting on the individual first uneven engaging portions 321 and 338 can be reduced, and the detent of the insulating member 33 can be further strengthened.
シャフト35は、内周側鉄心34が備える貫通穴343に通され、圧入やカシメなどによって内周側鉄心34に固着されている。
The shaft 35 is passed through a through hole 343 provided in the inner peripheral side iron core 34, and is fixed to the inner peripheral side iron core 34 by press fitting or caulking.
空気調和機に搭載される送風ファンを回転駆動するために用いられる永久磁石電動機1は、PWM方式のインバータで駆動されるため、巻線の中性点電位が零にならず、コモンモード電圧と呼ばれる電圧が発生する。このコモンモード電圧に起因して、永久磁石電動機1の内部の浮遊容量によって、第1軸受41や第2軸受42の外輪と内輪の間に電位差(軸電圧)が発生する。この軸電圧が軸受内部油膜の絶縁破壊電圧に達すると、軸受内部に電流が流れて軸受内部に電食を発生させる。
Since the permanent magnet motor 1 used to rotationally drive the blower fan mounted on the air conditioner is driven by a PWM inverter, the neutral point potential of the winding does not become zero, and the common mode voltage is used. A voltage called is generated. Due to this common mode voltage, a potential difference (shaft voltage) is generated between the outer ring and the inner ring of the first bearing 41 and the second bearing 42 due to the stray capacitance inside the permanent magnet motor 1. When this shaft voltage reaches the dielectric breakdown voltage of the oil film inside the bearing, a current flows inside the bearing and causes electrolytic corrosion inside the bearing.
上記の回転子3において、絶縁部材33は、図4乃至図10に示すように、円筒形状に形成され、回転子3の静電容量を低減させるために、軸方向の一端に第1軸方向穴331が形成され、軸方向の他端に同様に回転子3の静電容量を低減させるための第2軸方向穴332が形成されている。これらの第1軸方向穴331および第2軸方向穴332は、円周方向に等間隔に複数(例えば10個)形成されている。複数の第1軸方向穴331のそれぞれの間、および、複数の第2軸方向穴332のそれぞれの間には、隔壁334が一様に形成され、円周方向に隣接する第1軸方向穴331同士、および、円周方向に隣接する第2軸方向穴332同士を区切っている。ここで、回転子3の平面図および底面図は同一である。隔壁334は、絶縁部材33(連結部)の機械的強度を高めており、回転子3が回転する際、内周側鉄心34と外周側鉄心32間で回転運動の動力を十分に伝達させることができる。
In the rotor 3, the insulating member 33 is formed in a cylindrical shape as shown in FIGS. 4 to 10, and in order to reduce the capacitance of the rotor 3, one end in the axial direction is in the first axial direction. A hole 331 is formed, and a second axial hole 332 for reducing the capacitance of the rotor 3 is similarly formed at the other end in the axial direction. A plurality (for example, 10) of these first axial holes 331 and the second axial holes 332 are formed at equal intervals in the circumferential direction. A partition wall 334 is uniformly formed between each of the plurality of first axial holes 331 and between each of the plurality of second axial holes 332, and the first axial holes adjacent to each other in the circumferential direction. The 331s and the second axial holes 332 adjacent to each other in the circumferential direction are separated from each other. Here, the plan view and the bottom view of the rotor 3 are the same. The partition wall 334 enhances the mechanical strength of the insulating member 33 (connecting portion), and when the rotor 3 rotates, the power of the rotational motion is sufficiently transmitted between the inner peripheral side iron core 34 and the outer peripheral side iron core 32. Can be done.
さらに、図7に示すように、第1軸方向穴331と第2軸方向穴332は、軸方向で互いに対向しており、絶縁部材33の軸方向の中央(軸方向に対向する第1軸方向穴331と第2軸方向穴332の間)には、互いの穴の深さが同じになるように区切る壁部333が設けられている。壁部333は、絶縁部材33(連結部)の機械的強度を高めており、回転子3が回転する際、内周側鉄心34と外周側鉄心32間で回転運動の動力を十分に伝達させることができる。また、この壁部333が設けられることで、壁部333の一端側には第1軸方向穴331の底部335cが形成され、壁部333の他端側には第2軸方向穴332の底部335cが形成されている。そして、第1軸方向穴331と第2軸方向穴332のそれぞれの底部335cから軸方向に沿って側壁335aおよび側壁335bが形成されている。
Further, as shown in FIG. 7, the first axial hole 331 and the second axial hole 332 face each other in the axial direction, and the center of the insulating member 33 in the axial direction (the first axis facing the axial direction). (Between the direction hole 331 and the second axial direction hole 332), a wall portion 333 is provided so as to divide the holes so that the depths of the holes are the same. The wall portion 333 enhances the mechanical strength of the insulating member 33 (connecting portion), and when the rotor 3 rotates, the power of the rotational movement is sufficiently transmitted between the inner peripheral side iron core 34 and the outer peripheral side iron core 32. be able to. Further, by providing the wall portion 333, a bottom portion 335c of the first axial direction hole 331 is formed on one end side of the wall portion 333, and a bottom portion of the second axial direction hole 332 is formed on the other end side of the wall portion 333. 335c is formed. A side wall 335a and a side wall 335b are formed along the axial direction from the bottom 335c of each of the first axial hole 331 and the second axial hole 332.
このように、第1軸方向穴331と第2軸方向穴332は、壁部333が形成されることによって、両端面から軸方向に沿う方向に深さを有する構造になっている。また、第1軸方向穴331と第2軸方向穴332は、図6乃至図9に示すように、軸方向から見た端面形状が円周方向に沿う円弧状に形成されているとともに、それぞれが等間隔に複数(例えば円周方向に10個)形成されている。
As described above, the first axial hole 331 and the second axial hole 332 have a structure having a depth in the direction along the axial direction from both end faces by forming the wall portion 333. Further, as shown in FIGS. 6 to 9, the first axial hole 331 and the second axial hole 332 are formed so that the end face shape seen from the axial direction is an arc shape along the circumferential direction, respectively. Are formed at equal intervals (for example, 10 in the circumferential direction).
ここで、例えば、半径が小さく軸方向に厚い回転子3に対して第1軸方向穴331と第2軸方向穴332を形成するときは、回転子3の半径が小さいので、第1軸方向穴331と第2軸方向穴332の半径方向の長さ(幅)Rも小さく制限される。
Here, for example, when the first axial hole 331 and the second axial hole 332 are formed with respect to the rotor 3 having a small radius and a thick axial direction, the radius of the rotor 3 is small, so that the first axial direction is formed. The radial length (width) R of the hole 331 and the second axial hole 332 is also limited to be small.
また、本実施形態における絶縁部材33は、PBTやPETなどの誘電体の樹脂を外周側鉄心32および内周側鉄心34とともに一体成型することで形成されるため、第1軸方向穴331と第2軸方向穴332の成型時の金型の抜き勾配を考慮すると、第1軸方向穴331および第2軸方向穴332の半径方向の長さ(幅)Rを大きくすることができない。
Further, since the insulating member 33 in the present embodiment is formed by integrally molding a dielectric resin such as PBT or PET together with the outer peripheral side iron core 32 and the inner peripheral side iron core 34, the first axial direction hole 331 and the first Considering the draft of the mold at the time of molding the biaxial hole 332, the length (width) R in the radial direction of the first axial hole 331 and the second axial hole 332 cannot be increased.
このような回転子3の静電容量を低減させるためには、例えば、第1軸方向穴331と第2軸方向穴332の深さを深くすることが考えられる。しかしながら、第1軸方向穴331と第2軸方向穴332の深さを深くしすぎると、第1軸方向穴331と第2軸方向穴332を区切る壁部333の厚さが薄くなり、絶縁部材33の機械的強度が低下することから、機械的強度を確保するためには適当な厚さの壁部333が必要となる。ここでは機械的強度を高めるため、外周側鉄心32の隔壁323(抜止部)の軸方向厚さ、および、内周側鉄心34の隔壁344(抜止部)の軸方向厚さを、壁部333の(軸方向)厚さに概ね等しくしている。
In order to reduce the capacitance of such a rotor 3, for example, it is conceivable to increase the depth of the first axial hole 331 and the second axial hole 332. However, if the depth of the first axial hole 331 and the second axial hole 332 is made too deep, the thickness of the wall portion 333 that separates the first axial hole 331 and the second axial hole 332 becomes thin, and insulation is provided. Since the mechanical strength of the member 33 is lowered, a wall portion 333 having an appropriate thickness is required to secure the mechanical strength. Here, in order to increase the mechanical strength, the axial thickness of the partition wall 323 (retaining portion) of the outer peripheral side iron core 32 and the axial thickness of the partition wall 344 (removing portion) of the inner peripheral side iron core 34 are set to the wall portion 333. Is approximately equal to the (axial) thickness of.
また、本実施形態では、上述したように、第1軸方向穴331と第2軸方向穴332は、図6乃至図9に示すように、軸方向から見た際の端面形状を円周方向に沿う円弧状に形成している。すなわち、第1軸方向穴331および第2軸方向穴332の半径方向の長さ(幅)Rを円周方向で一定にすることで、穴の大きさを限られた空間内で大きくし、かつ、回転子3の静電容量を低減させることができる。
Further, in the present embodiment, as described above, the first axial hole 331 and the second axial hole 332 have a circumferential end face shape when viewed from the axial direction, as shown in FIGS. 6 to 9. It is formed in an arc shape along. That is, by making the length (width) R in the radial direction of the first axial hole 331 and the second axial hole 332 constant in the circumferential direction, the size of the hole can be increased in a limited space. Moreover, the capacitance of the rotor 3 can be reduced.
上述のように、第1軸方向穴331および第2軸方向穴332の大きさや形状は、回転子3の静電容量の低減と機械的強度の確保の両方を考慮して決定される。
As described above, the size and shape of the first axial hole 331 and the second axial hole 332 are determined in consideration of both the reduction of the capacitance of the rotor 3 and the securing of mechanical strength.
ところで、一般的に、樹脂の線膨張係数は、金属の線膨張係数に比較して10倍以上大きい。そのため、樹脂製の絶縁部材33は、温度上昇時の膨張量や温度降下時の収縮量が、金属製の外周側鉄心32および内周側鉄心34に比較して大きくなる。
By the way, in general, the coefficient of linear expansion of resin is 10 times or more larger than the coefficient of linear expansion of metal. Therefore, in the resin insulating member 33, the amount of expansion when the temperature rises and the amount of contraction when the temperature drops are larger than those of the metal outer peripheral side iron core 32 and the inner peripheral side iron core 34.
そして、絶縁部材33は、図6乃至図8に示すように、側壁335a、335bが、半径方向に薄く、軸方向に厚い。そのため、絶縁部材33における側壁335a、335bの膨張量や収縮量は、半径方向に比較して軸方向の方が大きくなる。
As shown in FIGS. 6 to 8, the side walls 335a and 335b of the insulating member 33 are thin in the radial direction and thick in the axial direction. Therefore, the amount of expansion and contraction of the side walls 335a and 335b of the insulating member 33 is larger in the axial direction than in the radial direction.
また、絶縁部材33の壁部333および隔壁334の膨張量や収縮量は、半径方向の成分と軸方向の成分に分けられるが、半径方向への膨張や収縮は外周側鉄心32および内周側鉄心34によって規制されるので、半径方向の膨張量や収縮量に比べて軸方向の膨張量や収縮量の方が大きくなりやすい。
Further, the amount of expansion and contraction of the wall portion 333 and the partition wall 334 of the insulating member 33 are divided into a radial component and an axial component, but the radial expansion and contraction are performed on the outer peripheral side iron core 32 and the inner peripheral side. Since it is regulated by the iron core 34, the amount of expansion and contraction in the axial direction tends to be larger than the amount of expansion and contraction in the radial direction.
ここで、図7および図8に示される、外周側鉄心32と内周側鉄心34とに挟まれた絶縁部材33は、膨張や収縮による軸方向での変位(位置の変化)が、膨張や収縮する前に軸方向のどの位置にあったかによって変動する。すなわち、絶縁部材33は、軸方向の中央部分を境として両軸方向に向かってそれぞれ膨張または収縮するため、絶縁部材33において軸方向の中央部分から遠い箇所程、変位が大きくなる。例えば、軸方向の中央部分(壁部333付近)は、膨張前後での軸方向の変位は殆どない。一方、軸方向の端部(端部335d付近)は、膨張前後で軸方向の変位が大きい。なお、絶縁部材33は、径方向の幅が小さい上に、径方向への膨張及び収縮が規制されているため、膨張及び収縮による径方向での変位は、軸方向の位置に依らず殆ど変わらない。
Here, the insulating member 33 sandwiched between the outer peripheral side iron core 32 and the inner peripheral side iron core 34 shown in FIGS. 7 and 8 is displaced in the axial direction (change in position) due to expansion or contraction. It varies depending on where it was in the axial direction before it contracted. That is, since the insulating member 33 expands or contracts in both axial directions with the central portion in the axial direction as a boundary, the displacement becomes larger as the insulating member 33 is farther from the central portion in the axial direction. For example, the central portion in the axial direction (near the wall portion 333) has almost no axial displacement before and after expansion. On the other hand, the axial end (near the end 335d) has a large axial displacement before and after expansion. Since the insulating member 33 has a small radial width and is restricted from expanding and contracting in the radial direction, the displacement in the radial direction due to the expansion and contraction is almost the same regardless of the axial position. Absent.
また、絶縁部材33において半径方向への膨張や収縮が外周側鉄心32および内周側鉄心34によって規制される箇所は、熱応力が集中しやすい。そのため、本実施形態においては、絶縁部材33の壁部333および隔壁334に熱応力が集中してしまう。
Further, in the insulating member 33, thermal stress is likely to be concentrated in a portion where expansion or contraction in the radial direction is regulated by the outer peripheral side iron core 32 and the inner peripheral side iron core 34. Therefore, in the present embodiment, the thermal stress is concentrated on the wall portion 333 and the partition wall 334 of the insulating member 33.
このように、絶縁部材33の側壁335a、335b、壁部333、隔壁334の温度上昇による膨張を考えたときに、半径方向への膨張に比べて軸方向への膨張量が大きくなりやすい上に、膨張が規制された箇所や変位量が大きい箇所に特に熱応力が集中する。
As described above, when considering the expansion due to the temperature rise of the side walls 335a, 335b, the wall portion 333, and the partition wall 334 of the insulating member 33, the amount of expansion in the axial direction tends to be larger than that in the radial direction. , Thermal stress is particularly concentrated in places where expansion is regulated or where the amount of displacement is large.
そして、この絶縁部材33の膨張の影響により、図7に示される壁部333と側壁335aおよび335bとが交わる部分に熱応力が集中するが、第1軸方向穴331および第2軸方向穴332(第1の凹部)が設けられていることにより、この第1の凹部側に力を逃がすことができ、熱応力を緩和できる。
加えて、絶縁部材33の膨張の影響により、側壁335aおよび335bの軸方向の端部に熱応力が集中するが、上述の第1の凹部が設けられていることにより、この第1の凹部側に力を逃がすことができ、熱応力を緩和できる。 Then, due to the influence of the expansion of the insulatingmember 33, the thermal stress is concentrated on the portion where the wall portion 333 and the side walls 335a and 335b shown in FIG. 7 intersect, but the first axial direction hole 331 and the second axial direction hole 332 Since the (first recess) is provided, the force can be released to the first recess side, and the thermal stress can be relaxed.
In addition, due to the influence of the expansion of the insulatingmember 33, the thermal stress is concentrated on the axial ends of the side walls 335a and 335b, but the above-mentioned first recess is provided, so that the first recess side The force can be released and the thermal stress can be relieved.
加えて、絶縁部材33の膨張の影響により、側壁335aおよび335bの軸方向の端部に熱応力が集中するが、上述の第1の凹部が設けられていることにより、この第1の凹部側に力を逃がすことができ、熱応力を緩和できる。 Then, due to the influence of the expansion of the insulating
In addition, due to the influence of the expansion of the insulating
一方、図8に示される隔壁334は、径方向への膨張を外周側鉄心32と内周側鉄心34とに規制されるとともに、軸方向の端部335d付近の膨張による変位量が特に大きくなる。そのため、絶縁部材33の膨張の影響により、特に、外周側鉄心32および内周側鉄心34の内側および外側の縁部に被さっている絶縁部材33の軸方向の端部335d付近が割れやすい。
On the other hand, in the partition wall 334 shown in FIG. 8, the expansion in the radial direction is restricted to the outer peripheral side iron core 32 and the inner peripheral side iron core 34, and the displacement amount due to the expansion near the axial end portion 335d becomes particularly large. .. Therefore, due to the influence of the expansion of the insulating member 33, the vicinity of the axial end portion 335d of the insulating member 33 that covers the inner and outer edges of the outer peripheral side iron core 32 and the inner peripheral side iron core 34 is particularly liable to crack.
そこで、絶縁部材33は、上述した熱割れを防止するために、図6および図8に示すように、環状に配置されている第1軸方向穴331同士の間および第2軸方向穴332同士の間となる位置において、軸方向の一端に第3軸方向穴336が形成され、軸方向の他端に同様に第4軸方向穴337が形成されるようにした。これらの第3軸方向穴336および第4軸方向穴337(第2の凹部336,337)は、第1軸方向穴331および第2軸方向穴332(第1の凹部331、332)と同一円周上に形成されるとともに、円環状に配置されている。
また、第3軸方向穴336および第4軸方向穴337(第2の凹部)は、第1軸方向穴331および第2軸方向穴332と同様に、円周方向に等間隔に複数(例えば10個)形成されている。さらに、各々の第3軸方向穴336および第4軸方向穴337は、上述した隔壁334と軸方向に重なるように配置されている。また、第3軸方向穴336と第4軸方向穴337は、図6乃至図9に示すように、軸方向から見た際の端面形状を円周方向に沿う円弧状に形成されている。また、第3軸方向穴336や第4軸方向穴337が、第1軸方向穴331や第2軸方向穴332と連続することで、絶縁部材33の軸方向の両端面には環状の凹溝部が形成されている。すなわち、第1軸方向穴331および第2軸方向穴332を第1の凹部とし、第3軸方向穴336および第4軸方向穴337を第2の凹部としたとき、絶縁部材(連結部)33の軸方向の両端面に、環状に形成された環状の凹溝部(331、336、および、332、337)が設けられる。この環状の凹溝部は、両端面における径方向の長さ(幅)Rを円周方向で一定にすることで、円周方向で均一に力を分散することができる。 Therefore, in order to prevent the above-mentioned thermal cracking, the insulatingmember 33 is provided between the first axial holes 331 and between the second axial holes 332, which are arranged in an annular shape, as shown in FIGS. 6 and 8. A third axial hole 336 is formed at one end in the axial direction, and a fourth axial hole 337 is similarly formed at the other end in the axial direction at a position between the two. The third axial hole 336 and the fourth axial hole 337 (second recesses 336 and 337) are the same as the first axial hole 331 and the second axial hole 332 (first recesses 331 and 332). It is formed on the circumference and is arranged in an annular shape.
Further, a plurality of thirdaxial hole 336 and fourth axial hole 337 (second concave portion) are provided at equal intervals in the circumferential direction, similarly to the first axial hole 331 and the second axial hole 332 (for example,). 10) are formed. Further, each of the third axial hole 336 and the fourth axial hole 337 is arranged so as to overlap the partition wall 334 described above in the axial direction. Further, as shown in FIGS. 6 to 9, the third axial hole 336 and the fourth axial hole 337 are formed so that the end face shape when viewed from the axial direction is an arc shape along the circumferential direction. Further, the third axial hole 336 and the fourth axial hole 337 are continuous with the first axial hole 331 and the second axial hole 332, so that the insulating member 33 has an annular recess on both end surfaces in the axial direction. A groove is formed. That is, when the first axial hole 331 and the second axial hole 332 are the first recesses, and the third axial hole 336 and the fourth axial hole 337 are the second recesses, the insulating member (connecting portion). An annular concave groove portions (331, 336, and 332, 337) formed in an annular shape are provided on both end faces in the axial direction of the 33. By making the length (width) R in the radial direction on both end faces constant in the circumferential direction, the annular concave groove portion can uniformly disperse the force in the circumferential direction.
また、第3軸方向穴336および第4軸方向穴337(第2の凹部)は、第1軸方向穴331および第2軸方向穴332と同様に、円周方向に等間隔に複数(例えば10個)形成されている。さらに、各々の第3軸方向穴336および第4軸方向穴337は、上述した隔壁334と軸方向に重なるように配置されている。また、第3軸方向穴336と第4軸方向穴337は、図6乃至図9に示すように、軸方向から見た際の端面形状を円周方向に沿う円弧状に形成されている。また、第3軸方向穴336や第4軸方向穴337が、第1軸方向穴331や第2軸方向穴332と連続することで、絶縁部材33の軸方向の両端面には環状の凹溝部が形成されている。すなわち、第1軸方向穴331および第2軸方向穴332を第1の凹部とし、第3軸方向穴336および第4軸方向穴337を第2の凹部としたとき、絶縁部材(連結部)33の軸方向の両端面に、環状に形成された環状の凹溝部(331、336、および、332、337)が設けられる。この環状の凹溝部は、両端面における径方向の長さ(幅)Rを円周方向で一定にすることで、円周方向で均一に力を分散することができる。 Therefore, in order to prevent the above-mentioned thermal cracking, the insulating
Further, a plurality of third
なお、特に、第2の凹部(第3軸方向穴336、第4軸方向穴337)の底部(隔壁334の軸方向端部の位置)が、回転子鉄心(外周側鉄心32および内周側鉄心34)の軸方向の端面よりも軸方向中央部側となるように形成されるとき、絶縁部材33における熱応力の集中が抑制されることが確認されている。これを踏まえ、本実施形態においては、第3軸方向穴336および第4軸方向穴337の深さは、絶縁部材33の軸方向の端面から5.5mmの深さとなるよう形成されている。一方、第1軸方向穴331および第2軸方向穴332の深さは、絶縁部材33の軸方向の端面から16.5mmの深さとなるように形成されている。
In particular, the bottom portion (position of the axial end portion of the partition wall 334) of the second recess (third axial hole 336, fourth axial hole 337) is a rotor core (outer peripheral side iron core 32 and inner peripheral side). It has been confirmed that the concentration of thermal stress in the insulating member 33 is suppressed when the iron core 34) is formed so as to be closer to the central portion in the axial direction than the end face in the axial direction. Based on this, in the present embodiment, the depth of the third axial hole 336 and the fourth axial hole 337 is formed so as to be 5.5 mm from the axial end face of the insulating member 33. On the other hand, the depth of the first axial hole 331 and the second axial hole 332 is formed so as to be 16.5 mm from the axial end face of the insulating member 33.
ここで、図14および表1に示されるように、第1軸方向穴331および第2軸方向穴332の深さ(第1の凹部の深さ)をM[mm]、第3軸方向穴336および第4軸方向穴337の深さ(第2の凹部の深さ)をS[mm]、外周側鉄心32および内周側鉄心34の軸方向長さ(コア積厚)をL[mm]、壁部333の軸方向の厚さ(中央壁厚さ)をC[mm]とする。
このとき、第2の凹部(336、337)の底部が、回転子鉄心(32、34)の軸方向の端面よりも軸方向中央部側となる条件は、図14からも分かるように、
2M+C-2S<L
となることである。回転子3は、この条件式を満たすように設計されることが望ましい。すなわち、この条件式を満たすことで、より確実に絶縁部材33の熱割れを防止することができる。なお、2M+Cは絶縁部材33の軸方向長さに一致する。 Here, as shown in FIGS. 14 and 1, the depths of the firstaxial hole 331 and the second axial hole 332 (the depth of the first recess) are M [mm], and the third axial hole. The depth of the 336 and the fourth axial hole 337 (the depth of the second recess) is S [mm], and the axial length (core product thickness) of the outer peripheral side iron core 32 and the inner peripheral side iron core 34 is L [mm]. ], The axial thickness (central wall thickness) of the wall portion 333 is C [mm].
At this time, as can be seen from FIG. 14, the condition that the bottom portion of the second recess (336, 337) is on the axially central portion side of the axial end face of the rotor cores (32, 34) is known.
2M + C-2S <L
Is to be. It is desirable that therotor 3 is designed so as to satisfy this conditional expression. That is, by satisfying this conditional expression, it is possible to more reliably prevent thermal cracking of the insulating member 33. 2M + C corresponds to the axial length of the insulating member 33.
このとき、第2の凹部(336、337)の底部が、回転子鉄心(32、34)の軸方向の端面よりも軸方向中央部側となる条件は、図14からも分かるように、
2M+C-2S<L
となることである。回転子3は、この条件式を満たすように設計されることが望ましい。すなわち、この条件式を満たすことで、より確実に絶縁部材33の熱割れを防止することができる。なお、2M+Cは絶縁部材33の軸方向長さに一致する。 Here, as shown in FIGS. 14 and 1, the depths of the first
At this time, as can be seen from FIG. 14, the condition that the bottom portion of the second recess (336, 337) is on the axially central portion side of the axial end face of the rotor cores (32, 34) is known.
2M + C-2S <L
Is to be. It is desirable that the
よって、第2の凹部である第3軸方向穴336および第4軸方向穴337の形成によって、絶縁部材33の軸方向の長さが大きい領域を減らして絶縁部材33の総体積を減少させることができ、絶縁部材33の軸方向への膨張量や収縮量を小さくすることができる。また、第2の凹部336、337が設けられていることにより、軸方向の端部335d付近にかかる力を第2の凹部側に逃がすことができ、熱応力の緩和を行い、熱応力の集中を抑制することができる。このため、絶縁部材33の熱応力の集中による耐久性の低下を抑制することができ、熱割れやクラックの発生を抑制して長寿命化することができる。
Therefore, by forming the third axial hole 336 and the fourth axial hole 337, which are the second recesses, the region where the insulating member 33 has a large axial length is reduced, and the total volume of the insulating member 33 is reduced. The amount of expansion and contraction of the insulating member 33 in the axial direction can be reduced. Further, since the second recesses 336 and 337 are provided, the force applied to the vicinity of the axial end portion 335d can be released to the second recess side, the thermal stress is relaxed, and the thermal stress is concentrated. Can be suppressed. Therefore, it is possible to suppress a decrease in durability due to the concentration of thermal stress of the insulating member 33, and it is possible to suppress the occurrence of thermal cracks and cracks and extend the life.
すなわち、図5乃至図8に示されるように、これら複数の第3軸方向穴336(第2の凹部)は、環状に配置されている複数の第1軸方向穴331(第1の凹部)同士の間に配置されるとともに、円周方向に隣り合う第1軸方向穴331同士を繋ぐように形成されている。同様に、複数の第4軸方向穴337(第2の凹部)は、環状に配置されている複数の第2軸方向穴332(第1の凹部)同士の間に配置されるとともに、円周方向に隣り合う第2軸方向穴332同士を繋ぐように形成されている。これにより、熱応力の集中を抑制することができる。
That is, as shown in FIGS. 5 to 8, the plurality of third axial holes 336 (second recesses) are the plurality of first axial holes 331 (first recesses) arranged in an annular shape. It is arranged between the holes and is formed so as to connect the first axial holes 331 adjacent to each other in the circumferential direction. Similarly, the plurality of fourth axial holes 337 (second recesses) are arranged between the plurality of second axial holes 332 (first recesses) arranged in an annular shape and have a circumference. It is formed so as to connect the second axial holes 332 adjacent to each other in the direction. As a result, the concentration of thermal stress can be suppressed.
また、第3軸方向穴336および第4軸方向穴337の深さは、第1軸方向穴331および第2軸方向穴332の深さより小さく(浅く)形成されている。これにより、円周方向に隣り合う第1軸方向穴331同士の間、および円周方向に隣り合う第2軸方向穴332同士の間に、第2軸方向穴332同士を区画する隔壁334を形成することができ、絶縁部材33(連結部)の強度を高めることができる。
Further, the depths of the third axial hole 336 and the fourth axial hole 337 are formed to be smaller (shallow) than the depths of the first axial hole 331 and the second axial hole 332. As a result, a partition wall 334 that partitions the second axial holes 332 between the first axial holes 331 adjacent to each other in the circumferential direction and between the second axial holes 332 adjacent to each other in the circumferential direction is provided. It can be formed, and the strength of the insulating member 33 (connecting portion) can be increased.
また、第1軸方向穴331および第2軸方向穴332を第1の凹部とし、第3軸方向穴336および第4軸方向穴337を第2の凹部としたとき、絶縁部材(連結部)33の軸方向の両端面に、環状に形成された環状の凹溝部(331、336、および、332、337)が設けられる。これにより、絶縁部材33の軸方向の端部において、側壁335a,335bが径方向の環状の凹溝部側に膨張できるようになるので、熱応力の影響を更に緩和し、絶縁部材33の熱割れを防止できる。
Further, when the first axial hole 331 and the second axial hole 332 are used as the first recess and the third axial hole 336 and the fourth axial hole 337 are used as the second recess, the insulating member (connecting portion). An annular concave groove portions (331, 336, and 332, 337) formed in an annular shape are provided on both end faces in the axial direction of the 33. As a result, at the axial end of the insulating member 33, the side walls 335a and 335b can expand toward the annular concave groove in the radial direction, so that the influence of thermal stress is further mitigated and the insulating member 33 is thermally cracked. Can be prevented.
上記説明では、永久磁石電動機1の使用環境や駆動状態で固定子2の巻線23での発熱によって絶縁部材33が熱膨張する場合について説明した。それだけでなく、永久磁石電動機1の使用環境や駆動状態によって温度降下する際の熱収縮時にも第1軸方向穴331および第2軸方向穴332の底部周辺や、絶縁部材33の端部周辺における熱応力の集中を緩和することができる。
本実施形態では、熱応力を抑制するために、絶縁部材33に、第1の凹部331、332と、第2の凹部336、337を設け、絶縁部材33の軸方向への厚み(および樹脂の体積)を小さくし、熱膨張時と熱収縮時の応力を下げ、絶縁部材33の熱割れを防止することができる。 In the above description, a case where the insulatingmember 33 thermally expands due to heat generated by the winding 23 of the stator 2 in the usage environment and the driving state of the permanent magnet electric motor 1 has been described. Not only that, but also around the bottom of the first axial hole 331 and the second axial hole 332 and around the end of the insulating member 33 during heat shrinkage when the temperature drops depending on the usage environment and driving state of the permanent magnet motor 1. The concentration of thermal stress can be relaxed.
In the present embodiment, in order to suppress thermal stress, the insulatingmember 33 is provided with the first recesses 331 and 332 and the second recesses 336 and 337, and the thickness (and resin) of the insulating member 33 in the axial direction is provided. The volume) can be reduced, the stresses during thermal expansion and contraction can be reduced, and thermal cracking of the insulating member 33 can be prevented.
本実施形態では、熱応力を抑制するために、絶縁部材33に、第1の凹部331、332と、第2の凹部336、337を設け、絶縁部材33の軸方向への厚み(および樹脂の体積)を小さくし、熱膨張時と熱収縮時の応力を下げ、絶縁部材33の熱割れを防止することができる。 In the above description, a case where the insulating
In the present embodiment, in order to suppress thermal stress, the insulating
したがって、シャフト35を支持する第1軸受41および第2軸受42の電食を防止するために回転子3に絶縁部材33を配置し、絶縁部材33に第1軸方向穴331および第2軸方向穴332と、第3軸方向穴336および第4軸方向穴337とを形成した場合に、直径の小さな回転子3を製作する際に問題となる絶縁部材33に発生する熱応力の集中を緩和させることができる。
その結果、外周側鉄心32と内周側鉄心34との間の連結強度を保持しながら、この間のインピーダンスを高め、回転子3の静電容量を低減する小型の回転子3を製作することができる。また、回転子3を備える永久磁石電動機1も小型化することができる。 Therefore, in order to prevent electrolytic corrosion of thefirst bearing 41 and the second bearing 42 that support the shaft 35, the insulating member 33 is arranged on the rotor 3, and the insulating member 33 has the first axial hole 331 and the second axial direction. When the hole 332 and the third axial hole 336 and the fourth axial hole 337 are formed, the concentration of thermal stress generated in the insulating member 33, which is a problem when the rotor 3 having a small diameter is manufactured, is alleviated. Can be made to.
As a result, it is possible to manufacture asmall rotor 3 that maintains the connection strength between the outer peripheral side iron core 32 and the inner peripheral side iron core 34, increases the impedance between them, and reduces the capacitance of the rotor 3. it can. Further, the permanent magnet electric motor 1 provided with the rotor 3 can also be miniaturized.
その結果、外周側鉄心32と内周側鉄心34との間の連結強度を保持しながら、この間のインピーダンスを高め、回転子3の静電容量を低減する小型の回転子3を製作することができる。また、回転子3を備える永久磁石電動機1も小型化することができる。 Therefore, in order to prevent electrolytic corrosion of the
As a result, it is possible to manufacture a
ここで、第1軸方向穴331および第2軸方向穴332の少なくとも一方、または、第3軸方向穴336および第4軸方向穴337の少なくとも一方に、静電容量や耐久性を調整するための部材(樹脂、金属など)が取り付けられてもよい。
Here, in order to adjust the capacitance and durability of at least one of the first axial hole 331 and the second axial hole 332, or at least one of the third axial hole 336 and the fourth axial hole 337. Members (resin, metal, etc.) may be attached.
また、上記各実施形態では、第1軸方向穴331および第2軸方向穴332と、第3軸方向穴336および第4軸方向穴337の、軸方向から見た際の端面形状が、円周方向に沿う円弧状に形成される場合を説明したが、各軸方向穴の形状はこれに限られない。また、第1軸方向穴331および第2軸方向穴332と、第3軸方向穴336および第4軸方向穴337のそれぞれの個数は、10個に限定されるものではなく、任意の個数とすることができる。
Further, in each of the above embodiments, the end face shapes of the first axial hole 331 and the second axial hole 332 and the third axial hole 336 and the fourth axial hole 337 when viewed from the axial direction are circular. Although the case where the shape is formed in an arc shape along the circumferential direction has been described, the shape of each axial hole is not limited to this. Further, the number of the first axial hole 331 and the second axial hole 332 and the number of each of the third axial hole 336 and the fourth axial hole 337 are not limited to 10, but can be any number. can do.
また、上記各実施形態では、第1軸方向穴331および第2軸方向穴332を壁部333に対して対称形状に形成しているが、これに限定されるものではなく、第1軸方向穴331と第2軸方向穴332が壁部333に対して非対称形状(例えば軸方向から見てC型)に形成されてもよい。同様に、第3軸方向穴336および第4軸方向穴337が壁部333に対して非対称形状(例えば軸方向から見てC型)に形成されてもよい。
Further, in each of the above embodiments, the first axial hole 331 and the second axial hole 332 are formed symmetrically with respect to the wall portion 333, but the present invention is not limited to this, and the first axial direction is not limited to this. The hole 331 and the second axial hole 332 may be formed in an asymmetrical shape (for example, C-shaped when viewed from the axial direction) with respect to the wall portion 333. Similarly, the third axial hole 336 and the fourth axial hole 337 may be formed in an asymmetrical shape (for example, C-shaped when viewed from the axial direction) with respect to the wall portion 333.
さらに、上記各実施形態では、外周側鉄心32の外周面に永久磁石31を配置した表面磁石型の回転子3に本発明を適用した場合について説明したが、これに限定されるものではなく、外周側鉄心32の外周面に対する弦位置に軸方向に延長するスロットを形成し、このスロット内に永久磁石を配置した埋込磁石型の回転子にも本発明を適用することができる。
Further, in each of the above embodiments, the case where the present invention is applied to the surface magnet type rotor 3 in which the permanent magnet 31 is arranged on the outer peripheral surface of the outer peripheral side iron core 32 has been described, but the present invention is not limited thereto. The present invention can also be applied to an embedded magnet type rotor in which a slot extending in the axial direction is formed at a chord position with respect to the outer peripheral surface of the outer peripheral side iron core 32 and a permanent magnet is arranged in this slot.
1…永久磁石電動機
2…固定子
10…室外機
101…ベース
102…底板
103…上板
104…側板
21…固定子鉄心
22…インシュレータ
23…巻線
3…回転子
31…永久磁石
311…永久磁石片
32…外周側鉄心
321…内周側凹部(第1の凹凸係合部)
323…隔壁(抜止部)
33…絶縁部材(連結部)
33a…一端面
33b…他端面
331…第1軸方向穴(第1の凹部)
332…第2軸方向穴(第1の凹部)
333…壁部
334…隔壁
335a,335b…側壁
335c…底部
335d…端部
336…第3軸方向穴(第2の凹部)
337…第4軸方向穴(第2の凹部)
338…外周側凸部(第1の凹凸係合部)
339…内周側凸部(第2の凹凸係合部)
34…内周側鉄心
341…外周側凹部(第2の凹凸係合部)
343…貫通穴
344…隔壁(抜止部)
35…シャフト
41…第1軸受
42…第2軸受
51…第1ブラケット
511…第1軸受収容部
512…フランジ部
52…第2ブラケット
521…ブラケット本体部
522…第2軸受収容部
523…放熱フィン
6…モータ外郭
71…伝熱部材
72…回路基板
O…中心軸 1 ...Permanent magnet motor 2 ... Stator 10 ... Outdoor unit 101 ... Base 102 ... Bottom plate 103 ... Top plate 104 ... Side plate 21 ... Stator Iron core 22 ... Insulator 23 ... Winding 3 ... Rotor 31 ... Permanent magnet 311 ... Permanent magnet One piece 32 ... Outer peripheral side iron core 321 ... Inner peripheral side concave portion (first uneven engagement portion)
323 ... Septum (removal part)
33 ... Insulation member (connecting part)
33a ... One end surface 33b ... Theother end surface 331 ... First axial hole (first recess)
332 ... 2nd axial hole (1st recess)
333 ...Wall 334 ... Partition 335a, 335b ... Side wall 335c ... Bottom 335d ... End 336 ... Third axial hole (second recess)
337 ... Fourth axial hole (second recess)
338 ... Convex portion on the outer peripheral side (first uneven engagement portion)
339 ... Inner peripheral side convex portion (second uneven engagement portion)
34 ... Inner peripheralside iron core 341 ... Outer peripheral side concave portion (second uneven engagement portion)
343 ... Throughhole 344 ... Partition wall (retaining part)
35 ...Shaft 41 ... 1st bearing 42 ... 2nd bearing 51 ... 1st bracket 511 ... 1st bearing accommodating part 512 ... Flange part 52 ... 2nd bracket 521 ... Bracket body part 522 ... 2nd bearing accommodating part 523 ... Heat transfer fin 6 ... Motor outer shell 71 ... Heat transfer member 72 ... Circuit board O ... Central axis
2…固定子
10…室外機
101…ベース
102…底板
103…上板
104…側板
21…固定子鉄心
22…インシュレータ
23…巻線
3…回転子
31…永久磁石
311…永久磁石片
32…外周側鉄心
321…内周側凹部(第1の凹凸係合部)
323…隔壁(抜止部)
33…絶縁部材(連結部)
33a…一端面
33b…他端面
331…第1軸方向穴(第1の凹部)
332…第2軸方向穴(第1の凹部)
333…壁部
334…隔壁
335a,335b…側壁
335c…底部
335d…端部
336…第3軸方向穴(第2の凹部)
337…第4軸方向穴(第2の凹部)
338…外周側凸部(第1の凹凸係合部)
339…内周側凸部(第2の凹凸係合部)
34…内周側鉄心
341…外周側凹部(第2の凹凸係合部)
343…貫通穴
344…隔壁(抜止部)
35…シャフト
41…第1軸受
42…第2軸受
51…第1ブラケット
511…第1軸受収容部
512…フランジ部
52…第2ブラケット
521…ブラケット本体部
522…第2軸受収容部
523…放熱フィン
6…モータ外郭
71…伝熱部材
72…回路基板
O…中心軸 1 ...
323 ... Septum (removal part)
33 ... Insulation member (connecting part)
33a ... One end surface 33b ... The
332 ... 2nd axial hole (1st recess)
333 ...
337 ... Fourth axial hole (second recess)
338 ... Convex portion on the outer peripheral side (first uneven engagement portion)
339 ... Inner peripheral side convex portion (second uneven engagement portion)
34 ... Inner peripheral
343 ... Through
35 ...
Claims (8)
- 外周側鉄心と、内周側鉄心と、前記外周側鉄心と前記内周側鉄心を連結する連結部とを備え、
前記連結部は絶縁性樹脂で形成され、
前記連結部の軸方向の両端面には、環状に配置された複数の第1の凹部と、円周方向に隣り合う前記第1の凹部同士を繋ぐ複数の第2の凹部と、が設けられ、
前記第2の凹部の深さは、前記第1の凹部の深さよりも浅く形成される
回転子。 It is provided with an outer peripheral side iron core, an inner peripheral side iron core, and a connecting portion for connecting the outer peripheral side iron core and the inner peripheral side iron core.
The connecting portion is made of an insulating resin.
A plurality of first recesses arranged in an annular shape and a plurality of second recesses connecting the first recesses adjacent to each other in the circumferential direction are provided on both end faces in the axial direction of the connecting portion. ,
The rotor formed so that the depth of the second recess is shallower than the depth of the first recess. - 請求項1に記載の回転子であって、
前記連結部には、円周方向に隣り合う前記第1の凹部同士を区画する複数の隔壁が設けられ、
前記第2の凹部と前記隔壁とは、前記軸方向に重なって配置される
回転子。 The rotor according to claim 1.
The connecting portion is provided with a plurality of partition walls that partition the first recesses adjacent to each other in the circumferential direction.
The second recess and the partition wall are rotors arranged so as to overlap each other in the axial direction. - 請求項1または2に記載の回転子であって、
複数の前記第1の凹部と複数の前記第2の凹部とが連続することで、前記連結部の軸方向の両端面には、環状の凹溝部が形成されている
回転子。 The rotor according to claim 1 or 2.
A rotor in which an annular recessed groove portion is formed on both end faces in the axial direction of the connecting portion by connecting the plurality of the first recesses and the plurality of the second recesses. - 請求項1~3のいずれか1項に記載の回転子であって、
前記外周側鉄心と前記連結部との間に設けられ、前記外周側鉄心と前記連結部との間での回り止めを行う第1の凹凸係合部と、
前記連結部と前記内周側鉄心との間に設けられ、前記連結部と前記内周側鉄心との間での回り止めを行う第2の凹凸係合部と、
を備える
回転子。 The rotor according to any one of claims 1 to 3.
A first concavo-convex engaging portion provided between the outer peripheral side iron core and the connecting portion and for preventing rotation between the outer peripheral side iron core and the connecting portion,
A second concave-convex engaging portion provided between the connecting portion and the inner peripheral side iron core to prevent rotation between the connecting portion and the inner peripheral side iron core,
A rotor equipped with. - 請求項4に記載の回転子であって、
前記軸方向に隣接する前記第1の凹凸係合部同士の間、および、前記軸方向に隣接する前記第2の凹凸係合部同士の間の、少なくとも一方には、前記外周側鉄心または前記内周側鉄心に対する前記連結部の抜け止めを行う抜止部が形成されている
回転子。 The rotor according to claim 4.
At least one of the first concavo-convex engaging portions adjacent to each other in the axial direction and the second concavo-convex engaging portions adjacent to the axial direction is the outer peripheral side iron core or the said. A rotor in which a retaining portion is formed to prevent the connecting portion from coming off from the inner peripheral side iron core. - 請求項4または5に記載の回転子であって、
前記第2の凹凸係合部の個数は、前記第1の凹凸係合部の個数より多い
回転子。 The rotor according to claim 4 or 5.
The number of the second concave-convex engaging portions is larger than the number of the first concave-convex engaging portions of the rotor. - 請求項1~6のいずれか1項に記載の回転子であって、
前記絶縁性樹脂は、ポリブチレンテレフタレート(PBT)またはPET(ポリエチレンテレフタレート)である
回転子。 The rotor according to any one of claims 1 to 6.
The insulating resin is a rotor that is polybutylene terephthalate (PBT) or PET (polyethylene terephthalate). - モータ外郭に固定された固定子と、前記固定子の内周側に配置された回転子と、を備えた電動機であって、
前記回転子は、永久磁石が固定される環状の外周側鉄心と、前記外周側鉄心の内周側に位置する内周側鉄心と、前記外周側鉄心と前記内周側鉄心の間に位置し、絶縁性樹脂で形成された連結部と、前記内周側鉄心に連結されるとともに、前記モータ外郭に軸受によって回転自在に支持されたシャフトとを備え、
前記連結部の軸方向の両端面に、環状に配置された複数の第1の凹部と、円周方向に隣り合う前記第1の凹部同士を繋ぐ複数の第2の凹部とが設けられ、
前記第2の凹部の深さは、前記第1の凹部の深さよりも浅く形成される
回転子を備えた電動機。 An electric motor including a stator fixed to the outer shell of the motor and a rotor arranged on the inner peripheral side of the stator.
The rotor is located between the annular outer peripheral side iron core to which the permanent magnet is fixed, the inner peripheral side iron core located on the inner peripheral side of the outer peripheral side iron core, and the outer peripheral side iron core and the inner peripheral side iron core. A connecting portion made of an insulating resin and a shaft connected to the inner peripheral side iron core and rotatably supported by a bearing on the outer shell of the motor are provided.
A plurality of first recesses arranged in an annular shape and a plurality of second recesses connecting the first recesses adjacent to each other in the circumferential direction are provided on both end faces in the axial direction of the connecting portion.
An electric motor having a rotor formed so that the depth of the second recess is shallower than the depth of the first recess.
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JP2007215301A (en) * | 2006-02-08 | 2007-08-23 | Toyota Motor Corp | Rotor manufacturing method |
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JP2016034176A (en) * | 2014-07-31 | 2016-03-10 | 日立アプライアンス株式会社 | Rotor |
WO2018011979A1 (en) * | 2016-07-15 | 2018-01-18 | 三菱電機株式会社 | Consequent pole rotor, electric motor, air conditioner, and consequent pole rotor manufacturing method |
JP2018023241A (en) * | 2016-08-05 | 2018-02-08 | 三菱電機株式会社 | Rotor and rotary electric machine |
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JP2000188837A (en) * | 1998-12-21 | 2000-07-04 | Matsushita Electric Ind Co Ltd | Permanent magnet rotor and its manufacture |
JP4848584B2 (en) * | 2000-12-21 | 2011-12-28 | パナソニック株式会社 | Permanent magnet rotor, method of manufacturing permanent magnet rotor, motor |
JP3674523B2 (en) * | 2001-03-15 | 2005-07-20 | 三菱電機株式会社 | Stator for rotating electric machine and method for manufacturing the same |
JP4932620B2 (en) * | 2007-07-06 | 2012-05-16 | 日本電産サンキョー株式会社 | Rotor, rotor manufacturing method, and motor |
JP5624304B2 (en) * | 2009-11-09 | 2014-11-12 | 株式会社東芝 | Rotating electrical machine rotor |
JP2013183512A (en) * | 2012-03-01 | 2013-09-12 | Jtekt Corp | Electric motor |
JP6659169B2 (en) * | 2016-04-11 | 2020-03-04 | 三菱電機株式会社 | Rotor and rotating electric machine |
JP2018061382A (en) * | 2016-10-06 | 2018-04-12 | 株式会社富士通ゼネラル | Permanent magnet motor |
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JP2007215301A (en) * | 2006-02-08 | 2007-08-23 | Toyota Motor Corp | Rotor manufacturing method |
JP2008220154A (en) * | 2007-02-06 | 2008-09-18 | Honda Motor Co Ltd | Magnetic machine |
JP2016034176A (en) * | 2014-07-31 | 2016-03-10 | 日立アプライアンス株式会社 | Rotor |
WO2018011979A1 (en) * | 2016-07-15 | 2018-01-18 | 三菱電機株式会社 | Consequent pole rotor, electric motor, air conditioner, and consequent pole rotor manufacturing method |
JP2018023241A (en) * | 2016-08-05 | 2018-02-08 | 三菱電機株式会社 | Rotor and rotary electric machine |
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JP7331418B2 (en) | 2023-08-23 |
CN113544941A (en) | 2021-10-22 |
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