WO2013128881A1 - Molded motor - Google Patents

Molded motor Download PDF

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Publication number
WO2013128881A1
WO2013128881A1 PCT/JP2013/001080 JP2013001080W WO2013128881A1 WO 2013128881 A1 WO2013128881 A1 WO 2013128881A1 JP 2013001080 W JP2013001080 W JP 2013001080W WO 2013128881 A1 WO2013128881 A1 WO 2013128881A1
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WO
WIPO (PCT)
Prior art keywords
winding
mold
motor
flow path
gas flow
Prior art date
Application number
PCT/JP2013/001080
Other languages
French (fr)
Japanese (ja)
Inventor
暢謙 森田
近藤　憲司
誠治 黒住
Original Assignee
パナソニック株式会社
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Filing date
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Publication of WO2013128881A1 publication Critical patent/WO2013128881A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/08—Insulating casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
    • H02K2205/09—Machines characterised by drain passages or by venting, breathing or pressure compensating means

Definitions

  • the present invention relates to a mold motor including a rotor in which a stator core around which a winding is wound is molded by a mold resin.
  • mold motors used for home appliances and the like are strongly required to be small, thin, and have high output.
  • a molded motor incorporated in some home appliances is also required to have low noise and low vibration.
  • a mold motor that molds a stator core around which a winding is wound with a mold resin.
  • the mold motor 101 used for the conventional home appliance will be described with reference to FIG.
  • the stator 110 includes a stator core 12 that is a stator core around which the winding 11 is wound, and a mold resin 114 that is molded except for the inner peripheral surface of the stator core 12.
  • the winding 11 is wound around the stator core 12 via a winding frame.
  • a rotation shaft 22 is provided along the central axis of the rotor 20.
  • the rotating shaft 22 is supported by bearings 102 and 103 so that the rotating shaft 22 is rotatable.
  • the bearing 103 is held by the bracket 4.
  • a control circuit 130 for controlling the current flowing through the winding 11 is provided.
  • Patent Document 1 proposes forming an organic lubricant film on a polyurethane electric wire.
  • Patent Document 2 proposes a device that suppresses an adverse effect on electronic components caused by forming a resin film on a polyurethane electric wire. That is, generation of decomposition gas is prevented by providing self-lubricating properties to the coating of the electric wire itself.
  • Patent Document 3 proposes an improvement in the reliability of a molded motor. Specifically, the outer peripheral surface of the stator core (corresponding to the “stator core” of the present invention) is partially exposed. This improves the insulation characteristics of the molded motor under conditions of high temperature and high humidity.
  • the molded motor according to the present invention includes a stator, a rotor, and a bearing.
  • the stator core is molded with mold resin.
  • a winding is wound around the stator core.
  • the stator core has a slot.
  • the rotor includes a rotating body and a rotating shaft.
  • the rotating body has a permanent magnet in the circumferential direction facing the stator.
  • the rotating shaft passes through the axis of the rotating body.
  • the pair of bearings sandwich the rotating shaft so as to be rotatable.
  • the mold resin has a gas flow path that guides gas generated in the stator, particularly decomposition gas, to the outside of the mold resin.
  • FIG. 1 is a perspective view of a molded motor according to Embodiment 1 of the present invention.
  • FIG. 2 is a longitudinal sectional view of the molded motor according to Embodiment 1 of the present invention.
  • FIG. 3 is a cross-sectional view of the winding in the first embodiment of the present invention.
  • FIG. 4 is a cross-sectional view of another winding in the first embodiment of the present invention.
  • FIG. 5 is a perspective view of the insulator according to Embodiment 1 of the present invention.
  • FIG. 6 is a perspective view of another insulator according to Embodiment 1 of the present invention.
  • FIG. 7 is an explanatory diagram of the molded motor according to the first embodiment of the present invention.
  • FIG. 1 is a perspective view of a molded motor according to Embodiment 1 of the present invention.
  • FIG. 2 is a longitudinal sectional view of the molded motor according to Embodiment 1 of the present invention.
  • FIG. 3 is a cross-
  • FIG. 8 is an explanatory view showing a change in weight of polybutylene terephthalate in Example 1 of the present invention.
  • FIG. 9 is an explanatory diagram showing a change in weight of the bulk mold compound in Example 1 of the present invention.
  • FIG. 10 is an explanatory diagram showing a dielectric strength test result of the molded motor in Example 1 of the present invention.
  • FIG. 11 is an explanatory view showing the dielectric strength test result of the molded motor in Comparative Example 1 of the present invention.
  • FIG. 12 is a perspective view of another insulator according to Embodiment 1 of the present invention.
  • FIG. 13 is a perspective view of still another insulator according to Embodiment 1 of the present invention.
  • FIG. 14 is a longitudinal sectional view of a conventional molded motor.
  • the decomposition gas when decomposition gas is generated from an insulating material such as an insulating film or an insulator applied to the winding wound around the stator core, the decomposition gas is transferred to the outside of the mold motor. A gas flow path is provided. A detailed configuration will be described later.
  • the decomposition gas generated in the mold motor is guided to the outside of the mold resin, that is, to the outside of the mold motor. Therefore, it can avoid that the atmosphere in a mold motor becomes high temperature high pressure. As a result, the insulation characteristics required for the molded motor are ensured.
  • the conventional mold motor has the following points to be improved. That is, some conventional molded motors form an organic lubricant film on a polyurethane wire. Alternatively, some conventional molded motors impart self-lubricating properties to the polyurethane wire coating itself. These conventional molded motors prevent generation of decomposition gas. However, these conventional molded motors can suppress the generation of cracked gas, but cannot completely eliminate the cracked gas generation itself.
  • a higher load than before may be applied to the molded motor.
  • the mold motor was driven under such a high load condition, there were the following points to be improved. That is, when the mold motor is driven under a high load condition, a current exceeding the initially assumed range is supplied to the winding. As a result, the winding generates more heat than originally expected. This heat generation warms the insulating film of the winding and the insulating member such as an insulator provided between the stator core and the winding. When an insulating member such as an insulating film of a winding or an insulator is warmed, decomposition gas is generated.
  • the windings and insulation members are covered with mold resin. Therefore, the atmosphere in the mold motor becomes high temperature and pressure. Under such a high temperature and high pressure, the insulating material contained in the insulating coating and the insulating member described above deteriorates at an accelerated rate. As a result, the insulation resistance of these insulating materials deteriorates. When the insulation resistance of the insulating material deteriorates, the insulation characteristics required for the molded motor cannot be maintained.
  • a molded motor according to an embodiment of the present invention will be described with reference to the drawings.
  • the following description will be made using a mold motor that exhibits a particularly remarkable effect, that is, a so-called brushless mold motor.
  • the following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
  • FIG. 1 is a perspective view of a molded motor according to Embodiment 1 of the present invention.
  • FIG. 2 is a longitudinal sectional view of the molded motor according to Embodiment 1 of the present invention.
  • the mold motor shown in the drawing is a molded brushless DC motor (hereinafter referred to as “mold motor”).
  • the mold motor 1 includes a stator 10 and a rotor 20 disposed inside the stator 10.
  • the stator 10 has a stator core 12 that is a stator core around which a winding 11 is wound. Specifically, the winding 11 is wound around the stator core 12 in a coil shape. An insulator 13 that is an insulating member is provided between the winding 11 and the stator core 12.
  • the stator 10 is configured integrally with a mold frame 14 that is molded with a resin material that becomes a mold resin, in particular, a thermosetting resin.
  • the winding 11 has a core wire 11A made of copper or the like. As shown in FIG. 3, layers of a first insulating coating 11B and a second insulating coating 11C are formed in order from the center side on the core wire 11A. Polyester can be used for the first insulating coating 11B. Polyamide can be used for the second insulating film. The diameter of the winding 11 provided with the second insulating coating 11C is about 0.3 mm. Further, as shown in FIG. 4, a lubricating film 11D having a self-lubricating property may be further applied to the second insulating film 11C. Paraffin oil can be used for this lubricating coating 11D.
  • the insulator 13 has a groove portion 15 in a direction intersecting with the direction in which the winding 11 is wound.
  • the mold resin used for the mold frame 14 for example, a resin having a thermal conductivity of 1.1 W / m ⁇ K and having flame retardancy of UL standard 94V-0 can be used. Specifically, the total blending amount of the unsaturated polyester resin and the polyester resin is 21.2% by weight, the glass fiber is 7% by weight, the polymerization initiator t-butyl peroxybenzoate is 0.4% by weight, Zinc stearate is 1.3% by weight, the polymerization inhibitor is 0.1% by weight, and aluminum hydroxide is 70% by weight.
  • the unsaturated polyester resin Sandoma (registered trademark) PB210 manufactured by DH Material Co., Ltd. can be used.
  • the polyester resin Sandoma PB987 manufactured by DH Material Co., Ltd. can be used.
  • the rotor 20 includes a rotating body 21 and a rotating shaft 22.
  • the rotating body 21 has a permanent magnet 23 in the circumferential direction facing the stator 10.
  • the rotating shaft 22 is attached through the axis of the rotating body 21.
  • Bearings are ball bearings 2 and 3 having an inner ring, an outer ring, and balls between the inner ring and the outer ring. A pair of ball bearings 2 and 3 pinch the rotor 20 in a freely rotatable manner.
  • the inner ring and the outer ring are made of sintered metal obtained by sintering metal powder.
  • the ball is made of iron.
  • the bracket 4 holds the ball bearing 3.
  • the bracket 4 is made of a conductive metal.
  • a galvanized steel plate, an aluminum die cast, a stainless steel plate or the like is used. More specifically, SECC or SECD can be used as the galvanized steel sheet.
  • ADC12 can be used as an aluminum die casting.
  • SUS304 or SUS430 can be used. Note that other metals may be used as long as similar characteristics can be obtained.
  • the ball bearing 2 is held integrally with the mold frame 14.
  • the ball bearing 3 is arranged so as to surround the rotating shaft 22.
  • an annular portion 4 ⁇ / b> A is provided in which a part of the bracket 4 protrudes in a convex shape toward the rotating body 21 to form an annular wall surface.
  • the ball bearing 3 is fixed to the annular portion 4A with a fitting tolerance.
  • the gas flow path 16 is formed in the mold frame 14.
  • the gas flow path 16 communicates the inside of the mold motor 1 and the outside of the mold motor 1.
  • the gas flow path 16 (16A, 16B, 16C, 16D, 16E) is provided in each part of the mold frame 14.
  • the gas flow path 16 ⁇ / b> A has one end provided at the position of the slot 17 included in the stator core 12 and the other end provided on the outer surface of the molded motor 1.
  • the gas flow path 16 ⁇ / b> B has one end provided on the end portion 13 ⁇ / b> A of the groove portion 15 provided in the insulator 13 and the other end provided on the outer surface of the mold motor 1.
  • the gas flow path 16 ⁇ / b> C has one end provided on the outermost peripheral portion 11 ⁇ / b> E of the winding 11 wound around the stator core 12 and the other end provided on the outer surface of the molded motor 1.
  • the gas flow path 16 ⁇ / b> D has one end provided on the end portion 13 ⁇ / b> B of the insulator 13 and the other end provided on the outer surface of the mold motor 1.
  • the gas flow path 16 ⁇ / b> E has one end provided on the end portion 13 ⁇ / b> C of the insulator 13 and the other end provided on the outer surface of the mold motor 1.
  • the gas flow path 16 provided at such a position is formed using a presser pin used at the time of molding.
  • a presser pin used for positioning the insulator 13 is used, the gas flow paths 16B, 16D, and 16E are easily formed. Therefore, the man-hour for forming the gas flow path 16 does not increase.
  • Mold motor 1 may have a control board on which an inverter circuit is mounted. When the control board is built in, the high-frequency pulse controlled by the control board switches the current flowing through the winding 11.
  • a predetermined control current is passed through the winding 11 of the stator 10.
  • the rotor 20 provided with the permanent magnet 23 rotates so as to follow the magnetic field generated by the control current.
  • the current supplied to the winding 11 increases or decreases according to the load applied to the rotating shaft 22.
  • the core wire 11A constituting the winding 11 has a resistance component. Therefore, when a current flows through the winding 11, the winding 11 generates heat due to the relationship between the current and the resistance component. When the winding 11 generates heat, decomposition gas is generated from the first insulating coating 11B, the second insulating coating 11C applied to the core wire 11A, an insulating member such as the insulator 13, and the like. At this time, the decomposition gas is discharged to the outside of the mold motor 1 through the gas flow path 16 (16A to 16E) that communicates the inside of the mold motor 1 and the outside of the mold motor 1. Details thereof will be described.
  • the winding 11 has a predetermined wire diameter. Therefore, when the winding 11 is wound around the stator core 12, a slight gap is generated between the windings 11. The decomposition gas generated inside the mold motor 1 moves to the surface of the stator 10 through this gap.
  • one end of the gas flow path 16A is provided at the position of each slot 17 of the stator core 12.
  • the windings 11 wound around the adjacent teeth 18 are densely packed in each slot 17. Some gaps exist between the windings 11 as described above. Therefore, the cracked gas flowing out to the slot 17 through the gap is led out of the mold motor 1 through the gas flow path 16A having one opening at the slot 17 position.
  • the winding 11 is wound around the stator core 12 via the insulator 13.
  • the insulator 13 has a groove 15 in a direction that intersects the direction in which the winding 11 is wound. Therefore, since a predetermined gap is generated between the winding 11 and the insulator 13, the winding 11 and the insulator 13 do not adhere to each other. Decomposed gas generated from the winding 11 and the insulator 13 flows along the groove 15. One end of the groove 15 communicates with one end of the gas flow path 16B. As a result, the cracked gas that has reached the gas flow path 16B via the groove 15 is led out of the mold motor 1 through the gas flow path.
  • the width of the groove 15 may be smaller than the minimum gap through which the mold resin constituting the mold frame 14 flows. With this configuration, the mold resin does not flow into the groove 15, and the mold resin does not hinder the cracked gas flow path of the groove 15.
  • the minimum gap through which the mold resin constituting the mold frame 14 flows is 0.1 mm. Therefore, the width of the groove 15 is set to 0.05 mm.
  • the winding 11 wound around the stator core 12 several times has a gap in the outermost peripheral portion 11E. Therefore, the decomposed gas generated in the winding 11 and the like moves to the outermost peripheral portion 11E of the winding 11 through the gap generated in the winding 11.
  • One end of a gas flow path 16 ⁇ / b> C leading to the outside of the molded motor 1 is provided on the outermost peripheral portion 11 ⁇ / b> E of the winding 11. Therefore, the decomposed gas that has moved to the outermost peripheral portion 11E of the winding 11 is led out of the molded motor 1 through the gas flow path 16C.
  • the decomposition gas generated in the mold motor 1 is transferred to the outside of the mold motor 1 through the gas flow paths 16 (16A to 16E) provided in the mold frame 14. Can be derived.
  • the inside of the mold motor 1 can be prevented from becoming a high temperature and a high pressure. Therefore, it is possible to prevent the insulating members such as the first insulating film 11B, the second insulating film 11C, and the insulator 13 of the winding 11 from being exposed to a high temperature and high pressure atmosphere. Therefore, it becomes possible to suppress deterioration of the first insulating coating 11B, the second insulating coating 11C and the insulating member, and the reliability of the molded motor 1 can be improved.
  • the molded motor 1 according to the first embodiment of the present invention it is possible to accelerate the discharge of the decomposition gas generated in the molded motor 1, so that a higher load than before can be applied. Therefore, the output as a mold motor can be increased. Alternatively, if the output is the same, the molded motor can be made smaller.
  • the lubricating film 11D having self-lubricating property is provided on the outermost surface of the winding 11, it is possible to suppress the mold resin forming the mold frame 14 and the winding 11 from being in close contact with each other. Therefore, it becomes easy to guide the cracked gas generated in the stator 10 to the gas flow path 16C.
  • FIG. 8 shows a result 30 of thermal analysis of polybutylene terephthalate (hereinafter referred to as “PBT”) used for the insulator 13 which is an insulating member, focusing on weight change (TG).
  • PBT polybutylene terephthalate
  • the winding temperature generated in the load region where the mold motor has been used is 100 ° C.
  • the winding temperature generated in the load region that can be used in the molded motor according to the first embodiment of the present invention is set to 150 ° C.
  • TG analysis was performed for the winding temperature of 100 ° C. and the winding temperature of 150 ° C. As a result, when 1000 hours passed, assuming that the weight change at 100 ° C. was 1, the weight change at 150 ° C. was confirmed to generate about 7.6 times as much cracked gas.
  • FIG. 9 shows a result 31 of thermal analysis of a bulk mold compound (hereinafter referred to as “BMC”) used as a mold resin constituting the mold frame 14 by paying attention to weight change (TG).
  • BMC is a glass fiber reinforced resin made of a thermosetting resin (unsaturated polyester) and an inorganic filler (aluminum hydroxide, calcium carbonate, etc.). Similar to PBT, a TG analysis was performed for a winding temperature of 100 ° C. and a winding temperature of 150 ° C. As a result, when 30 minutes passed, assuming that the weight change at 100 ° C. was 1, the weight change at 150 ° C. was confirmed to generate about twice as much cracked gas. In each measurement, EXSTAR6000TG / DTA, which is a differential thermothermal gravimetric simultaneous measurement apparatus manufactured by SII Nanotechnology, Inc. was used.
  • the winding 11 is not coated with a self-lubricant (specification 1) and the winding 11 is coated with a self-lubricating agent (specification) 2) was evaluated.
  • the operating conditions followed the dielectric strength test defined by the Electrical Appliance and Material Safety Law. When a voltage of 1000 V AC was applied between the power source and the rotating shaft 22 for 1 minute and the leakage current was 10 mA or less, it was determined that the standard was cleared. For this measurement, TOS5050, which is a withstand voltage tester manufactured by Kikusui Electronics Corporation, was used. The result 32 of this withstand voltage test is shown in FIG.
  • the specification 3 was measured as the range where the mold motor was used conventionally. Specifically, the molded motor in the specification 3 is not provided with the gas flow path that is characteristic of the present invention. Also, the winding is not coated with a self-lubricant. The winding temperature was set to 100 ° C. in light of conventional usage conditions.
  • the molded motor in specification 4 is not provided with a gas flow path, and no self-lubricant is applied to the windings.
  • the winding temperature was set to 150 ° C. in light of the required specifications.
  • the insulator 13 may be provided with a ridge 19 in a direction crossing the direction in which the winding 11 is wound.
  • the gas flow path 16 has one end provided on the end of the protrusion 19 provided on the insulator 13 and the other end provided on the outer surface of the molded motor 1.
  • the space between the adjacent protrusions 19 becomes a passage for the cracked gas.
  • the field of application of the present invention includes a stator in which a stator core around which a winding is wound is molded with a mold resin, and the stator motor is molded with a mold resin. it can.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Abstract

This molded motor (1) has: a stator (10) obtained by using a molding resin to mold a stator core (12), which is stator iron core on which windings (11) have been wound; a rotating element (20) including a rotating body (21) having a permanent magnet (23) in the peripheral direction facing the stator (10) and a rotating shaft (22) inserted through the axial center of the rotating body (21); and a pair of bearings (2, 3) for rotatably holding the rotating shaft (22). Furthermore, the molding resin has a gas channel (16) for guiding cracked gas produced by the rotating element (10) to the exterior of the molding resin.

Description

モールドモータMolded motor
　本発明は、巻線が巻装された固定子鉄心が、モールド樹脂によってモールド成形される回転子を備えるモールドモータに関する。 The present invention relates to a mold motor including a rotor in which a stator core around which a winding is wound is molded by a mold resin.
　従来、家電機器等に用いられるモールドモータは、小型化、薄型化および高出力化が強く求められる。特に、一部の家電機器に組み込まれるモールドモータには、低騒音や低振動であることも要求される。これらの要求に応えるため、巻線が巻装された固定子鉄心を、モールド樹脂によりモールド成形するモールドモータが提案されている。 Conventionally, mold motors used for home appliances and the like are strongly required to be small, thin, and have high output. In particular, a molded motor incorporated in some home appliances is also required to have low noise and low vibration. In order to meet these requirements, there has been proposed a mold motor that molds a stator core around which a winding is wound with a mold resin.
　図１４を用いて、従来の家電機器に用いられるモールドモータ１０１について、説明する。 The mold motor 101 used for the conventional home appliance will be described with reference to FIG.
　固定子１１０は、巻線１１が巻装された固定子鉄心であるステータコア１２と、このステータコア１２の内周面を除いて成形されるモールド樹脂１１４とを有する。巻線１１は、巻枠を介してステータコア１２に巻装される。 The stator 110 includes a stator core 12 that is a stator core around which the winding 11 is wound, and a mold resin 114 that is molded except for the inner peripheral surface of the stator core 12. The winding 11 is wound around the stator core 12 via a winding frame.
　ステータコア１２の内側には、外周面に永久磁石２３が施された回転子２０が存在する。回転子２０の中心軸に沿って、回転軸２２が設けられる。回転軸２２は、回転軸２２が回転自在となるよう軸受１０２，１０３によって支持される。軸受１０３は、ブラケット４により保持される。 Inside the stator core 12, there is a rotor 20 having a permanent magnet 23 on the outer peripheral surface. A rotation shaft 22 is provided along the central axis of the rotor 20. The rotating shaft 22 is supported by bearings 102 and 103 so that the rotating shaft 22 is rotatable. The bearing 103 is held by the bracket 4.
　モールドモータ１０１を形成するモールド樹脂１１４の内部には、巻線１１へ流す電流を制御する制御回路１３０が備えられる。 In the mold resin 114 forming the mold motor 101, a control circuit 130 for controlling the current flowing through the winding 11 is provided.
　近年、上記モールドモータ１０１に対する要求を満たすため、巻線１１は、線積率を高めることが検討されている。線積率を高めるために、巻線１１には、被膜として低沸点材料が塗布される。巻線１１の被膜となる低沸点材料には、巻線１１の潤滑性を向上するものが存在する。 In recent years, in order to satisfy the requirements for the molded motor 101, it has been studied to increase the line product ratio of the winding 11. In order to increase the line area ratio, a low boiling point material is applied to the winding 11 as a coating. Some low-boiling-point materials that form the coating of the winding 11 improve the lubricity of the winding 11.
　一方、従来、巻線１１に施された低沸点材料が揮発し、巻線１１間の絶縁障害が引き起こされることもよく知られている。 On the other hand, it is well known that a low boiling point material applied to the winding 11 volatilizes and an insulation failure between the windings 11 is caused.
　この絶縁障害への対応として、特許文献１では、ポリウレタン電線に有機潤滑剤の被膜を形成するものが提案されている。 As a countermeasure to this insulation failure, Patent Document 1 proposes forming an organic lubricant film on a polyurethane electric wire.
　また、特許文献２では、ポリウレタン電線に樹脂の被膜を形成することで生じる、電子部品への悪影響を抑制するものも提案されている。すなわち、電線の被膜自体に自己潤滑性を付与することで、分解ガスの発生が防止される。 Also, Patent Document 2 proposes a device that suppresses an adverse effect on electronic components caused by forming a resin film on a polyurethane electric wire. That is, generation of decomposition gas is prevented by providing self-lubricating properties to the coating of the electric wire itself.
　さらに、特許文献３では、モールドモータの信頼性を向上するものも提案されている。具体的には、ステータ鉄心（本願発明の「固定子鉄心」に相当）の外周面が、部分的に露出される。これは、高温高湿という条件化において、モールドモータの絶縁特性が改良される。 Furthermore, Patent Document 3 proposes an improvement in the reliability of a molded motor. Specifically, the outer peripheral surface of the stator core (corresponding to the “stator core” of the present invention) is partially exposed. This improves the insulation characteristics of the molded motor under conditions of high temperature and high humidity.
特開昭６３－１２１２１３号公報Japanese Unexamined Patent Publication No. Sho 63-121213 特開昭６３－１７８４１０号公報JP-A 63-178410 特公昭６１－６０６５５号公報Japanese Patent Publication No. 61-60655
　本発明に関するモールドモータは、固定子と、回転子と、軸受と、を備える。 The molded motor according to the present invention includes a stator, a rotor, and a bearing.
　固定子は、固定子鉄心がモールド樹脂によってモールドされる。固定子鉄心は、巻線が巻装される。固定子鉄心は、スロットを有する。回転子は、回転体と、回転軸と、を含む。回転体は、固定子に対向して周方向に永久磁石を有する。回転軸は、回転体の軸芯を貫通する。一対の軸受は、回転軸を回転自在に挟持する。モールド樹脂は、固定子で生じたガス、特に分解ガスをモールド樹脂の外部へと導くガス流路を有する。 The stator core is molded with mold resin. A winding is wound around the stator core. The stator core has a slot. The rotor includes a rotating body and a rotating shaft. The rotating body has a permanent magnet in the circumferential direction facing the stator. The rotating shaft passes through the axis of the rotating body. The pair of bearings sandwich the rotating shaft so as to be rotatable. The mold resin has a gas flow path that guides gas generated in the stator, particularly decomposition gas, to the outside of the mold resin.
図１は、本発明の実施の形態１におけるモールドモータの斜視図である。FIG. 1 is a perspective view of a molded motor according to Embodiment 1 of the present invention. 図２は、本発明の実施の形態１におけるモールドモータの縦断面図である。FIG. 2 is a longitudinal sectional view of the molded motor according to Embodiment 1 of the present invention. 図３は、本発明の実施の形態１における巻線の断面図である。FIG. 3 is a cross-sectional view of the winding in the first embodiment of the present invention. 図４は、本発明の実施の形態１における他の巻線の断面図である。FIG. 4 is a cross-sectional view of another winding in the first embodiment of the present invention. 図５は、本発明の実施の形態１におけるインシュレータの斜視図である。FIG. 5 is a perspective view of the insulator according to Embodiment 1 of the present invention. 図６は、本発明の実施の形態１における他のインシュレータの斜視図である。FIG. 6 is a perspective view of another insulator according to Embodiment 1 of the present invention. 図７は、本発明の実施の形態１におけるモールドモータの説明図である。FIG. 7 is an explanatory diagram of the molded motor according to the first embodiment of the present invention. 図８は、本発明の実施例１におけるポリブチレンテレフタレートの重量変化を示す説明図である。FIG. 8 is an explanatory view showing a change in weight of polybutylene terephthalate in Example 1 of the present invention. 図９は、本発明の実施例１におけるバルクモールドコンパウンドの重量変化を示す説明図である。FIG. 9 is an explanatory diagram showing a change in weight of the bulk mold compound in Example 1 of the present invention. 図１０は、本発明の実施例１におけるモールドモータの絶縁耐圧試験結果を示す説明図である。FIG. 10 is an explanatory diagram showing a dielectric strength test result of the molded motor in Example 1 of the present invention. 図１１は、本発明の比較例１におけるモールドモータの絶縁耐圧試験結果を示す説明図である。FIG. 11 is an explanatory view showing the dielectric strength test result of the molded motor in Comparative Example 1 of the present invention. 図１２は、本発明の実施の形態１における他のインシュレータの斜視図である。FIG. 12 is a perspective view of another insulator according to Embodiment 1 of the present invention. 図１３は、本発明の実施の形態１におけるさらに他のインシュレータの斜視図である。FIG. 13 is a perspective view of still another insulator according to Embodiment 1 of the present invention. 図１４は、従来のモールドモータの縦断面図である。FIG. 14 is a longitudinal sectional view of a conventional molded motor.
　本発明の実施の形態におけるモールドモータは、固定子鉄心へ巻装される巻線に施される絶縁被膜やインシュレータなどの絶縁材料から分解ガスが発生した場合、この分解ガスをモールドモータの外部へ導き出すガス流路を有する。詳細な構成は、後述する。 In the molded motor according to the embodiment of the present invention, when decomposition gas is generated from an insulating material such as an insulating film or an insulator applied to the winding wound around the stator core, the decomposition gas is transferred to the outside of the mold motor. A gas flow path is provided. A detailed configuration will be described later.
　従って、モールドモータ内で生じた分解ガスは、モールド樹脂の外部、つまり、モールドモータの外部へ導き出される。よって、モールドモータ内の雰囲気が高温高圧となることを回避できる。この結果、モールドモータに要求される絶縁特性は確保される。 Therefore, the decomposition gas generated in the mold motor is guided to the outside of the mold resin, that is, to the outside of the mold motor. Therefore, it can avoid that the atmosphere in a mold motor becomes high temperature high pressure. As a result, the insulation characteristics required for the molded motor are ensured.
　従来のモールドモータには、つぎの改善すべき点があった。すなわち、従来のモールドモータには、ポリウレタン電線に有機潤滑剤の被膜を形成するものがある。あるいは、従来のモールドモータには、ポリウレタン電線の被膜自体に自己潤滑性を付与するものがある。これら従来のモールドモータは、分解ガスが発生することを防止する。しかしながら、これら従来のモールドモータは、分解ガスの発生を抑制できるが、分解ガスの発生そのものを完全になくすことはできない。 The conventional mold motor has the following points to be improved. That is, some conventional molded motors form an organic lubricant film on a polyurethane wire. Alternatively, some conventional molded motors impart self-lubricating properties to the polyurethane wire coating itself. These conventional molded motors prevent generation of decomposition gas. However, these conventional molded motors can suppress the generation of cracked gas, but cannot completely eliminate the cracked gas generation itself.
　ところで、小型化、薄型化および高出力化などの要求を満たすために、モールドモータへ従来よりも高い負荷が加えられることがある。このような高負荷の条件下において、モールドモータを駆動した場合、つぎの改善すべき点があった。すなわち、高負荷の条件下において、モールドモータが駆動されると、当初想定された範囲以上の電流が巻線へ流される。その結果、巻線には、当初見込まれていた以上の発熱が生じる。この発熱によって、巻線の絶縁被膜や、ステータコアと巻線との間に設けられるインシュレータなどの絶縁部材が温められる。巻線の絶縁被膜やインシュレータなどの絶縁部材が温められると、分解ガスが発生する。 By the way, in order to satisfy the demands for downsizing, thinning, and high output, a higher load than before may be applied to the molded motor. When the mold motor was driven under such a high load condition, there were the following points to be improved. That is, when the mold motor is driven under a high load condition, a current exceeding the initially assumed range is supplied to the winding. As a result, the winding generates more heat than originally expected. This heat generation warms the insulating film of the winding and the insulating member such as an insulator provided between the stator core and the winding. When an insulating member such as an insulating film of a winding or an insulator is warmed, decomposition gas is generated.
　モールドモータ内において、巻線や絶縁部材などはモールド樹脂で覆われている。よって、モールドモータ内の雰囲気は高温高圧となる。このような高温高圧下において、上述した絶縁被膜や絶縁部材に含まれる絶縁材料は、加速度的に劣化が進行する。この結果、これらの絶縁材料は、耐絶縁性能が劣化する。絶縁材料の耐絶縁性能が劣化すると、モールドモータに要求される絶縁特性が維持できなくなる。 In the mold motor, the windings and insulation members are covered with mold resin. Therefore, the atmosphere in the mold motor becomes high temperature and pressure. Under such a high temperature and high pressure, the insulating material contained in the insulating coating and the insulating member described above deteriorates at an accelerated rate. As a result, the insulation resistance of these insulating materials deteriorates. When the insulation resistance of the insulating material deteriorates, the insulation characteristics required for the molded motor cannot be maintained.
　また、ステータ鉄心の外周面のみを部分的に露出しても、巻線から発生した分解ガスをモールドモータの外部へ排出することは困難である。よって、上述したものと同様、絶縁材料の耐絶縁性能が劣化するため、モールドモータに要求される絶縁特性が維持できなくなる。 Also, even if only the outer peripheral surface of the stator core is partially exposed, it is difficult to discharge the decomposition gas generated from the winding to the outside of the mold motor. Therefore, as described above, the insulation performance of the insulating material deteriorates, so that the insulation characteristics required for the molded motor cannot be maintained.
　以下、本発明の実施の形態におけるモールドモータについて、図面を参照しながら説明する。以下の説明は、特に顕著な効果を発揮するモールドモータ、いわゆるブラシレスモールドモータを用いて説明する。以下に示す実施の形態は、本発明を具体化した一例であって、本発明の技術的範囲を限定するものではない。 Hereinafter, a molded motor according to an embodiment of the present invention will be described with reference to the drawings. The following description will be made using a mold motor that exhibits a particularly remarkable effect, that is, a so-called brushless mold motor. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
　また、背景技術で説明したものと同じ構成要素については、同一の符号を付し、説明を援用する。 Also, the same components as those described in the background art are denoted by the same reference numerals, and the description is incorporated.
　（実施の形態１）
　図１は、本発明の実施の形態１におけるモールドモータの斜視図である。図２は、本発明の実施の形態１におけるモールドモータの縦断面図である。図に示すモールドモータは、モールド形成されたブラシレスＤＣモータ（以下、「モールドモータ」と記す。）である。 (Embodiment 1)
FIG. 1 is a perspective view of a molded motor according to Embodiment 1 of the present invention. FIG. 2 is a longitudinal sectional view of the molded motor according to Embodiment 1 of the present invention. The mold motor shown in the drawing is a molded brushless DC motor (hereinafter referred to as “mold motor”).
　モールドモータ１は、固定子１０と、固定子１０の内側に配された回転子２０とを備える。 The mold motor 1 includes a stator 10 and a rotor 20 disposed inside the stator 10.
　固定子１０は、巻線１１が巻装された固定子鉄心であるステータコア１２を有する。具体的には、巻線１１は、ステータコア１２の周りに対してコイル状に巻き回される。巻線１１とステータコア１２との間には、絶縁部材であるインシュレータ１３が設けられる。固定子１０は、モールド樹脂となる樹脂材、特に熱硬化性樹脂でモールド成形されたモールドフレーム１４と一体化して構成される。 The stator 10 has a stator core 12 that is a stator core around which a winding 11 is wound. Specifically, the winding 11 is wound around the stator core 12 in a coil shape. An insulator 13 that is an insulating member is provided between the winding 11 and the stator core 12. The stator 10 is configured integrally with a mold frame 14 that is molded with a resin material that becomes a mold resin, in particular, a thermosetting resin.
　巻線１１は、銅などで芯線１１Ａが構成される。図３に示すように、この芯線１１Ａに対して、中心側から順に、第１の絶縁被膜１１Ｂ、第２の絶縁被膜１１Ｃの層が形成される。第１の絶縁被膜１１Ｂには、ポリエステルを用いることができる。第２の絶縁被膜には、ポリアミドを用いることができる。第２の絶縁被膜１１Ｃが施された巻線１１の直径は、０．３ｍｍ程度となる。また、図４に示すように、さらに第２の絶縁被膜１１Ｃには、自己潤滑性を有する潤滑被膜１１Ｄを施してもよい。この潤滑被膜１１Ｄは、パラフィン油を用いることができる。 The winding 11 has a core wire 11A made of copper or the like. As shown in FIG. 3, layers of a first insulating coating 11B and a second insulating coating 11C are formed in order from the center side on the core wire 11A. Polyester can be used for the first insulating coating 11B. Polyamide can be used for the second insulating film. The diameter of the winding 11 provided with the second insulating coating 11C is about 0.3 mm. Further, as shown in FIG. 4, a lubricating film 11D having a self-lubricating property may be further applied to the second insulating film 11C. Paraffin oil can be used for this lubricating coating 11D.
　図５、図６に示すように、インシュレータ１３は、巻線１１が巻装される方向とは交差する方向に溝部１５を有する。 As shown in FIGS. 5 and 6, the insulator 13 has a groove portion 15 in a direction intersecting with the direction in which the winding 11 is wound.
　モールドフレーム１４に用いられるモールド樹脂は、例えば、熱伝導率が１．１Ｗ／ｍ・Ｋであり、ＵＬ規格の９４Ｖ－０の難燃性を有するものが使用できる。具体的な組成は、不飽和ポリエステル樹脂とポリエステル樹脂との合計配合量が２１．２重量％、ガラス繊維が７重量％、重合開始剤であるｔ－ブチルパーオキシベンゾエートが０．４重量％、ステアリン酸亜鉛が１．３重量％、重合禁止剤が０．１重量％、水酸化アルミニウムが７０重量％である。不飽和ポリエステル樹脂は、ディーエイチ・マテリアル株式会社製のサンドーマ（登録商標）ＰＢ２１０を用いることができる。ポリエステル樹脂は、ディーエイチ・マテリアル株式会社製のサンドーマＰＢ９８７を用いることができる。 As the mold resin used for the mold frame 14, for example, a resin having a thermal conductivity of 1.1 W / m · K and having flame retardancy of UL standard 94V-0 can be used. Specifically, the total blending amount of the unsaturated polyester resin and the polyester resin is 21.2% by weight, the glass fiber is 7% by weight, the polymerization initiator t-butyl peroxybenzoate is 0.4% by weight, Zinc stearate is 1.3% by weight, the polymerization inhibitor is 0.1% by weight, and aluminum hydroxide is 70% by weight. As the unsaturated polyester resin, Sandoma (registered trademark) PB210 manufactured by DH Material Co., Ltd. can be used. As the polyester resin, Sandoma PB987 manufactured by DH Material Co., Ltd. can be used.
　図２に示すように、回転子２０は、回転体２１と回転軸２２とを有する。回転体２１は、固定子１０に対向して周方向に永久磁石２３を有する。回転軸２２は、回転体２１の軸心を貫通して取り付けられる。 2, the rotor 20 includes a rotating body 21 and a rotating shaft 22. The rotating body 21 has a permanent magnet 23 in the circumferential direction facing the stator 10. The rotating shaft 22 is attached through the axis of the rotating body 21.
　軸受は、内輪と、外輪と、この内輪とこの外輪との間に玉と、を有する玉軸受２，３である。一対の玉軸受２，３は、回転子２０を回転自在に挟持する。内輪と外輪とは、金属粉末を焼結させた焼結金属で構成される。玉は鉄で構成される。 Bearings are ball bearings 2 and 3 having an inner ring, an outer ring, and balls between the inner ring and the outer ring. A pair of ball bearings 2 and 3 pinch the rotor 20 in a freely rotatable manner. The inner ring and the outer ring are made of sintered metal obtained by sintering metal powder. The ball is made of iron.
　ブラケット４は、玉軸受３を保持する。ブラケット４は、導電性を有する金属からなる。例えば、亜鉛めっき鋼板、アルミダイカスト、ステンレス鋼板などが用いられる。より具体的には、亜鉛めっき鋼板として、ＳＥＣＣやＳＥＣＤを用いることができる。アルミダイカストとして、ＡＤＣ１２を用いることができる。ステンレス鋼板として、ＳＵＳ３０４やＳＵＳ４３０を用いることができる。なお、同様の特性を得ることができれば、他の金属を用いてもよい。 The bracket 4 holds the ball bearing 3. The bracket 4 is made of a conductive metal. For example, a galvanized steel plate, an aluminum die cast, a stainless steel plate or the like is used. More specifically, SECC or SECD can be used as the galvanized steel sheet. ADC12 can be used as an aluminum die casting. As the stainless steel plate, SUS304 or SUS430 can be used. Note that other metals may be used as long as similar characteristics can be obtained.
　玉軸受２は、モールドフレーム１４と一体となって保持される。 The ball bearing 2 is held integrally with the mold frame 14.
　玉軸受３は、回転軸２２を囲うように配される。玉軸受３の周囲には、ブラケット４の一部を回転体２１方向へ凸状に突き出して環状の壁面とした環状部４Ａが設けられる。玉軸受３は、環状部４Ａに対して嵌め合い公差で固定される。 The ball bearing 3 is arranged so as to surround the rotating shaft 22. Around the ball bearing 3, an annular portion 4 </ b> A is provided in which a part of the bracket 4 protrudes in a convex shape toward the rotating body 21 to form an annular wall surface. The ball bearing 3 is fixed to the annular portion 4A with a fitting tolerance.
　ガス流路１６は、モールドフレーム１４に形成される。ガス流路１６は、モールドモータ１の内側とモールドモータ１の外側とを連通する。ガス流路１６（１６Ａ，１６Ｂ，１６Ｃ，１６Ｄ，１６Ｅ）は、モールドフレーム１４の各部に設けられる。 The gas flow path 16 is formed in the mold frame 14. The gas flow path 16 communicates the inside of the mold motor 1 and the outside of the mold motor 1. The gas flow path 16 (16A, 16B, 16C, 16D, 16E) is provided in each part of the mold frame 14.
　まず、図１、図７に示すように、ガス流路１６Ａは、一端をステータコア１２が有するスロット１７の位置に、他端をモールドモータ１の外表面に設ける。 First, as shown in FIGS. 1 and 7, the gas flow path 16 </ b> A has one end provided at the position of the slot 17 included in the stator core 12 and the other end provided on the outer surface of the molded motor 1.
　他に、図１、図７に示すように、ガス流路１６Ｂは、一端をインシュレータ１３に設けられた溝部１５の端部１３Ａに、他端をモールドモータ１の外表面に設ける。 In addition, as shown in FIGS. 1 and 7, the gas flow path 16 </ b> B has one end provided on the end portion 13 </ b> A of the groove portion 15 provided in the insulator 13 and the other end provided on the outer surface of the mold motor 1.
　また、図２に示すように、ガス流路１６Ｃは、一端をステータコア１２へ巻装された巻線１１の最外周部１１Ｅに、他端をモールドモータ１の外表面に設ける。 Further, as shown in FIG. 2, the gas flow path 16 </ b> C has one end provided on the outermost peripheral portion 11 </ b> E of the winding 11 wound around the stator core 12 and the other end provided on the outer surface of the molded motor 1.
　また、図２に示すように、ガス流路１６Ｄは、一端をインシュレータ１３の端部１３Ｂに、他端をモールドモータ１の外表面に設ける。 Further, as shown in FIG. 2, the gas flow path 16 </ b> D has one end provided on the end portion 13 </ b> B of the insulator 13 and the other end provided on the outer surface of the mold motor 1.
　あるいは、図２に示すように、ガス流路１６Ｅは、一端をインシュレータ１３の端部１３Ｃに、他端をモールドモータ１の外表面に設ける。 Alternatively, as shown in FIG. 2, the gas flow path 16 </ b> E has one end provided on the end portion 13 </ b> C of the insulator 13 and the other end provided on the outer surface of the mold motor 1.
　このような位置へ設けられるガス流路１６は、モールド成形時に使用される押えピンを用いて、形成される。特に、インシュレータ１３の位置決めに用いられる押えピンを用いれば、ガス流路１６Ｂ，１６Ｄ，１６Ｅは容易に形成される。よって、ガス流路１６を形成するための工数が、増加することはない。 The gas flow path 16 provided at such a position is formed using a presser pin used at the time of molding. In particular, if a presser pin used for positioning the insulator 13 is used, the gas flow paths 16B, 16D, and 16E are easily formed. Therefore, the man-hour for forming the gas flow path 16 does not increase.
　モールドモータ１は、インバータ回路を搭載した制御基板を内部に有してもよい。制御基板を内蔵した場合、この制御基板で制御された高周波パルスが、巻線１１へ流す電流を切替える。 Mold motor 1 may have a control board on which an inverter circuit is mounted. When the control board is built in, the high-frequency pulse controlled by the control board switches the current flowing through the winding 11.
　以上のように構成されたモールドモータ１について、その作用を説明する。 The operation of the molded motor 1 configured as described above will be described.
　固定子１０が有する巻線１１へ、所定の制御電流が流される。この制御電流が作り出す磁界を追従するように、永久磁石２３が設けられた回転子２０は回動する。回転軸２２へ加えられる負荷に応じて、巻線１１へ供給される電流は増減する。 A predetermined control current is passed through the winding 11 of the stator 10. The rotor 20 provided with the permanent magnet 23 rotates so as to follow the magnetic field generated by the control current. The current supplied to the winding 11 increases or decreases according to the load applied to the rotating shaft 22.
　巻線１１を構成する芯線１１Ａは、抵抗成分を有する。よって、巻線１１へ電流が流されると、この電流と抵抗成分との関係により、巻線１１は発熱する。巻線１１が発熱すれば、芯線１１Ａに施された第１の絶縁被膜１１Ｂ、第２の絶縁被膜１１Ｃや、インシュレータ１３などの絶縁部材などから分解ガスが発生する。このとき、分解ガスは、モールドモータ１の内側とモールドモータ１の外側とを連通するガス流路１６（１６Ａ乃至１６Ｅ）を経て、モールドモータ１の外側へ放出される。その詳細について、説明する。 The core wire 11A constituting the winding 11 has a resistance component. Therefore, when a current flows through the winding 11, the winding 11 generates heat due to the relationship between the current and the resistance component. When the winding 11 generates heat, decomposition gas is generated from the first insulating coating 11B, the second insulating coating 11C applied to the core wire 11A, an insulating member such as the insulator 13, and the like. At this time, the decomposition gas is discharged to the outside of the mold motor 1 through the gas flow path 16 (16A to 16E) that communicates the inside of the mold motor 1 and the outside of the mold motor 1. Details thereof will be described.
　巻線１１は所定の線径を有している。よって、ステータコア１２へ巻線１１が巻き付けられると、巻線１１間には多少の隙間が生じる。モールドモータ１の内側に生じた分解ガスは、この隙間を経由して、固定子１０表面へ移動する。 The winding 11 has a predetermined wire diameter. Therefore, when the winding 11 is wound around the stator core 12, a slight gap is generated between the windings 11. The decomposition gas generated inside the mold motor 1 moves to the surface of the stator 10 through this gap.
　ところで、モールドモータ１の内部に分解ガスが発生すると、モールドモータ１の内部における気圧は高くなる。そこで、固定子１０表面へ移動した分解ガスは、各部に設けられたガス流路１６（１６Ａ乃至１６Ｅ）を介して、モールドモータ１の外部へ導き出される。 By the way, when decomposition gas is generated inside the mold motor 1, the pressure inside the mold motor 1 becomes high. Therefore, the cracked gas that has moved to the surface of the stator 10 is led out of the mold motor 1 through the gas flow paths 16 (16A to 16E) provided in the respective parts.
　まず、ステータコア１２が有する各スロット１７の位置に、ガス流路１６Ａの一端が設けられる。各スロット１７には、隣接するティース１８へ巻き付けられた巻線１１が密集している。これら巻線１１間には、上述したように多少の隙間が存在している。よって、隙間を介してスロット１７へ流れ出た分解ガスは、スロット１７位置へ一方の開口を有するガス流路１６Ａを経て、モールドモータ１の外部へと導き出される。 First, one end of the gas flow path 16A is provided at the position of each slot 17 of the stator core 12. The windings 11 wound around the adjacent teeth 18 are densely packed in each slot 17. Some gaps exist between the windings 11 as described above. Therefore, the cracked gas flowing out to the slot 17 through the gap is led out of the mold motor 1 through the gas flow path 16A having one opening at the slot 17 position.
　次に、巻線１１は、インシュレータ１３を介してステータコア１２へ巻き付けられる。インシュレータ１３は、巻線１１が巻装される方向とは交差する方向へ溝部１５を有する。よって、巻線１１とインシュレータ１３との間には、所定の隙間が生じるため、巻線１１とインシュレータ１３とが密着することはない。巻線１１やインシュレータ１３から生じた分解ガスは、この溝部１５に沿って流れる。溝部１５の一端は、ガス流路１６Ｂの一端と連絡している。この結果、溝部１５を介してガス流路１６Ｂへとたどり着いた分解ガスは、ガス流路を経て、モールドモータ１の外部へと導き出される。 Next, the winding 11 is wound around the stator core 12 via the insulator 13. The insulator 13 has a groove 15 in a direction that intersects the direction in which the winding 11 is wound. Therefore, since a predetermined gap is generated between the winding 11 and the insulator 13, the winding 11 and the insulator 13 do not adhere to each other. Decomposed gas generated from the winding 11 and the insulator 13 flows along the groove 15. One end of the groove 15 communicates with one end of the gas flow path 16B. As a result, the cracked gas that has reached the gas flow path 16B via the groove 15 is led out of the mold motor 1 through the gas flow path.
　ところで、溝部１５の幅は、モールドフレーム１４を構成するモールド樹脂が流動する最小隙間よりも小さければよい。本構成とすれば、モールド樹脂が溝部１５へ流れ込むことがなく、モールド樹脂が溝部１５という分解ガスの流路を妨げることがなくなる。 Incidentally, the width of the groove 15 may be smaller than the minimum gap through which the mold resin constituting the mold frame 14 flows. With this configuration, the mold resin does not flow into the groove 15, and the mold resin does not hinder the cracked gas flow path of the groove 15.
　本実施の形態１では、モールドフレーム１４を構成するモールド樹脂が流動する最小隙間は、０．１ｍｍである。そこで、溝部１５の幅を０．０５ｍｍとした。 In the first embodiment, the minimum gap through which the mold resin constituting the mold frame 14 flows is 0.1 mm. Therefore, the width of the groove 15 is set to 0.05 mm.
　また、ステータコア１２に幾重にも巻装された巻線１１は、その最外周部１１Ｅに隙間が生じる。よって、巻線１１などで生じた分解ガスは、巻線１１に生じた隙間を経て、巻線１１の最外周部１１Ｅへと移動する。巻線１１の最外周部１１Ｅには、モールドモータ１の外部へと通じるガス流路１６Ｃの一端が設けられている。よって、巻線１１の最外周部１１Ｅへと移動した分解ガスは、ガス流路１６Ｃを介して、モールドモータ１の外部へと導き出される。 Further, the winding 11 wound around the stator core 12 several times has a gap in the outermost peripheral portion 11E. Therefore, the decomposed gas generated in the winding 11 and the like moves to the outermost peripheral portion 11E of the winding 11 through the gap generated in the winding 11. One end of a gas flow path 16 </ b> C leading to the outside of the molded motor 1 is provided on the outermost peripheral portion 11 </ b> E of the winding 11. Therefore, the decomposed gas that has moved to the outermost peripheral portion 11E of the winding 11 is led out of the molded motor 1 through the gas flow path 16C.
　本発明の実施の形態１におけるモールドモータ１を用いれば、モールドフレーム１４に設けられたガス流路１６（１６Ａ乃至１６Ｅ）を経て、モールドモータ１内に発生した分解ガスをモールドモータ１の外側へ導き出すことができる。この結果、モールドモータ１の内部が、高温高圧となることを回避できる。従って、巻線１１の第１の絶縁被膜１１Ｂ、第２の絶縁被膜１１Ｃやインシュレータ１３などの絶縁部材が高温高圧の雰囲気下に晒されることを防止できる。よって、これら第１の絶縁被膜１１Ｂ、第２の絶縁被膜１１Ｃや絶縁部材の劣化を抑制することが可能となり、モールドモータ１の信頼性を向上できる。 If the mold motor 1 according to the first embodiment of the present invention is used, the decomposition gas generated in the mold motor 1 is transferred to the outside of the mold motor 1 through the gas flow paths 16 (16A to 16E) provided in the mold frame 14. Can be derived. As a result, the inside of the mold motor 1 can be prevented from becoming a high temperature and a high pressure. Therefore, it is possible to prevent the insulating members such as the first insulating film 11B, the second insulating film 11C, and the insulator 13 of the winding 11 from being exposed to a high temperature and high pressure atmosphere. Therefore, it becomes possible to suppress deterioration of the first insulating coating 11B, the second insulating coating 11C and the insulating member, and the reliability of the molded motor 1 can be improved.
　あるいは、本発明の実施の形態１におけるモールドモータ１を用いれば、モールドモータ１内で生じた分解ガスの排出を促進できるため、従来よりも高い負荷を加えることが可能となる。従って、モールドモータとしての出力を上げることができる。または、同じ出力であれば、モールドモータを小型にすることも可能となる。 Alternatively, if the molded motor 1 according to the first embodiment of the present invention is used, it is possible to accelerate the discharge of the decomposition gas generated in the molded motor 1, so that a higher load than before can be applied. Therefore, the output as a mold motor can be increased. Alternatively, if the output is the same, the molded motor can be made smaller.
　なお、巻線１１の最表面へ自己潤滑性を有する潤滑被膜１１Ｄを設けた場合、モールドフレーム１４を成すモールド樹脂と巻線１１とが密着することを抑制できる。よって、固定子１０で生じた分解ガスをガス流路１６Ｃへと導き易くなる。 In addition, when the lubricating film 11D having self-lubricating property is provided on the outermost surface of the winding 11, it is possible to suppress the mold resin forming the mold frame 14 and the winding 11 from being in close contact with each other. Therefore, it becomes easy to guide the cracked gas generated in the stator 10 to the gas flow path 16C.
　（実施例１）
　本発明の実施の形態１におけるモールドモータ１を用いて、実験した結果を示す。図８に、絶縁部材であるインシュレータ１３に用いられるポリブチレンテレフタレート（Ｐｏｌｙｂｕｔｙｌｅｎｅ　Ｔｅｒｅｐｈｔｈａｌａｔｅ、以下「ＰＢＴ」と記す。）について、重量変化（ＴＧ）に着目して熱分析を行った結果３０を示す。 (Example 1)
An experimental result using the molded motor 1 according to the first embodiment of the present invention will be described. FIG. 8 shows a result 30 of thermal analysis of polybutylene terephthalate (hereinafter referred to as “PBT”) used for the insulator 13 which is an insulating member, focusing on weight change (TG).
　従来、モールドモータが使用されていた負荷領域で生じる巻線温度を１００℃とする。本発明の実施の形態１におけるモールドモータであれば使用可能となる負荷領域で生じる巻線温度を１５０℃とする。この巻線温度１００℃と巻線温度１５０℃について、ＴＧ分析を行った。その結果、１０００時間を経過したところで、１００℃での重量変化を１とした場合、１５０℃での重量変化は、約７．６倍の分解ガスが生じることが確認された。 Conventionally, the winding temperature generated in the load region where the mold motor has been used is 100 ° C. The winding temperature generated in the load region that can be used in the molded motor according to the first embodiment of the present invention is set to 150 ° C. TG analysis was performed for the winding temperature of 100 ° C. and the winding temperature of 150 ° C. As a result, when 1000 hours passed, assuming that the weight change at 100 ° C. was 1, the weight change at 150 ° C. was confirmed to generate about 7.6 times as much cracked gas.
　次に、図９に、モールドフレーム１４を構成するモールド樹脂として用いられるバルクモールドコンパウンド（以下、「ＢＭＣ」と記す。）について、重量変化（ＴＧ）に着目して熱分析を行った結果３１を示す。なお、ＢＭＣとは、熱硬化性樹脂(不飽和ポリエステル)と無機充填材(水酸化アルミニウム、炭酸カルシウム等)からなるガラス繊維強化樹脂である。ＰＢＴと同様、巻線温度１００℃と巻線温度１５０℃について、ＴＧ分析を行った。その結果、３０分を経過したところで、１００℃での重量変化を１とした場合、１５０℃での重量変化は、約２倍の分解ガスが生じることが確認された。なお、いずれの測定にも、エスアイアイ・ナノテクノロジー株式会社製の示差熱熱重量同時測定装置であるＥＸＳＴＡＲ６０００ＴＧ／ＤＴＡを用いた。 Next, FIG. 9 shows a result 31 of thermal analysis of a bulk mold compound (hereinafter referred to as “BMC”) used as a mold resin constituting the mold frame 14 by paying attention to weight change (TG). Show. BMC is a glass fiber reinforced resin made of a thermosetting resin (unsaturated polyester) and an inorganic filler (aluminum hydroxide, calcium carbonate, etc.). Similar to PBT, a TG analysis was performed for a winding temperature of 100 ° C. and a winding temperature of 150 ° C. As a result, when 30 minutes passed, assuming that the weight change at 100 ° C. was 1, the weight change at 150 ° C. was confirmed to generate about twice as much cracked gas. In each measurement, EXSTAR6000TG / DTA, which is a differential thermothermal gravimetric simultaneous measurement apparatus manufactured by SII Nanotechnology, Inc. was used.
　以上の結果から、１０００時間という長期的評価、および、３０分という短期的評価のいずれからも、巻線温度が高くなれば、より多くの分解ガスが発生することが確認された。 From the above results, it was confirmed from both the long-term evaluation of 1000 hours and the short-term evaluation of 30 minutes that more cracked gas is generated as the winding temperature increases.
　上記結果を踏まえ、本発明の実施の形態１におけるモールドモータ１について、巻線１１には自己潤滑剤が塗布されないもの（仕様１）と、巻線１１に自己潤滑剤が塗布されたもの（仕様２）とを評価した。運転条件は、電気用品安全法で定められた絶縁耐圧試験に従った。そして、電源と回転軸２２との間にＡＣ１０００Ｖで１分間の電圧を掛けて、リーク電流が１０ｍＡ以下である場合、規格クリアと判断した。この測定には、菊水電子工業株式会社製の耐電圧試験器であるＴＯＳ５０５０を用いた。この絶縁耐圧試験の結果３２を図１０に示す。 Based on the above results, in the molded motor 1 according to Embodiment 1 of the present invention, the winding 11 is not coated with a self-lubricant (specification 1) and the winding 11 is coated with a self-lubricating agent (specification) 2) was evaluated. The operating conditions followed the dielectric strength test defined by the Electrical Appliance and Material Safety Law. When a voltage of 1000 V AC was applied between the power source and the rotating shaft 22 for 1 minute and the leakage current was 10 mA or less, it was determined that the standard was cleared. For this measurement, TOS5050, which is a withstand voltage tester manufactured by Kikusui Electronics Corporation, was used. The result 32 of this withstand voltage test is shown in FIG.
　以上の結果より、ガス流路１６が設けられているモールドモータ１であれば、巻線１１への自己潤滑剤の塗布の有無に拘らず、上記規格をクリアできることが確認できた。 From the above results, it was confirmed that the above-mentioned standards can be cleared with the molded motor 1 provided with the gas flow path 16 regardless of whether or not the self-lubricant is applied to the winding 11.
　（比較例１）
　つぎに、上述した本発明の実施の形態１におけるモールドモータとの比較を行うため、次の仕様について評価を行った。 (Comparative Example 1)
Next, the following specifications were evaluated in order to compare with the molded motor according to Embodiment 1 of the present invention described above.
　まず、従来、モールドモータが使用されている範囲として仕様３を測定した。具体的には、仕様３におけるモールドモータには、本願発明が特徴とするガス流路が設けられていない。また、巻線には、自己潤滑剤も塗布されていない。巻線温度は、従来の使用状況に照らし、１００℃とした。 First, the specification 3 was measured as the range where the mold motor was used conventionally. Specifically, the molded motor in the specification 3 is not provided with the gas flow path that is characteristic of the present invention. Also, the winding is not coated with a self-lubricant. The winding temperature was set to 100 ° C. in light of conventional usage conditions.
　さらに、本願発明の特徴であるガス流路と、巻線に自己潤滑剤が塗布されたことの効果を検証するため、次の仕様を準備した。 Furthermore, the following specifications were prepared in order to verify the effect of the self-lubricant applied to the gas flow path and the winding, which is a feature of the present invention.
　仕様４におけるモールドモータは、ガス流路が設けられず、かつ、巻線には自己潤滑剤も塗布されない。巻線温度は、求められる仕様状況に照らして１５０℃とした。 The molded motor in specification 4 is not provided with a gas flow path, and no self-lubricant is applied to the windings. The winding temperature was set to 150 ° C. in light of the required specifications.
　仕様５におけるモールドモータは、ガス流路は設けられないものの、巻線には自己潤滑剤が塗布されている。巻線温度は、求められる仕様状況に照らして１５０℃とした。これらの評価結果３３を、図１１に示す。 Although the molded motor in specification 5 is not provided with a gas flow path, a self-lubricant is applied to the windings. The winding temperature was set to 150 ° C. in light of the required specifications. These evaluation results 33 are shown in FIG.
　以上の結果より、つぎの見解が導き出される。すなわち、仕様３の評価結果より、従来の使用状況であれば、ガス流路および巻線に自己潤滑剤が塗布されなくても、上記規格がクリアできていたことが確認できた。 From the above results, the following opinions can be derived. That is, from the evaluation result of specification 3, it was confirmed that the above-mentioned standard could be cleared even if the self-lubricant was not applied to the gas flow path and the winding in the conventional use situation.
　また、仕様４、仕様５の評価結果より、本願発明が特徴とするガス流路がなければ、巻線に自己潤滑剤が塗布されたとしても、上記規格がクリアできないことが確認できた。 In addition, from the evaluation results of specifications 4 and 5, it was confirmed that the above-mentioned standard could not be cleared even if the self-lubricant was applied to the winding without the gas flow path characterized by the present invention.
　以上の実験結果より、モールドモータにガス流路が設けられれば、従来の使用状況よりも厳しい環境であっても、上記規格がクリアできることが確認できた。これは、ガス流路が、モールドモータ内に発生した分解ガスをモールドモータ外へと導く、ガス抜き穴の役目を果たしているためと考えられる。この結果、本発明の実施の形態１におけるモールドモータを用いれば、同じ大きさのモールドモータであれば、より高い負荷を掛けることができる。あるいは、同じ負荷を掛けるのであれば、モールドモータの大きさをより小さくすることができる。 From the above experimental results, it was confirmed that if the gas flow path was provided in the mold motor, the above standards could be cleared even in a severer environment than the conventional usage situation. This is presumably because the gas flow path serves as a vent hole for guiding the decomposition gas generated in the mold motor to the outside of the mold motor. As a result, if the mold motor according to the first embodiment of the present invention is used, a higher load can be applied if the mold motor has the same size. Or if the same load is applied, the magnitude | size of a mold motor can be made smaller.
　なお、図１２、図１３に示すように、他の実施の形態として、インシュレータ１３には、巻線１１が巻装される方向とは交差する方向へ突条１９を施してもよい。本構成において、図２、図７に示すように、ガス流路１６は、一端をインシュレータ１３に設けられた突条１９の端部に、他端をモールドモータ１の外表面に設ける。このとき、隣接する突条１９間の空間が分解ガスの通り道となる。その結果、モールドモータ１内に発生した分解ガスを円滑にガス流路１６Ｂへと導くことが可能となる。 As shown in FIGS. 12 and 13, as another embodiment, the insulator 13 may be provided with a ridge 19 in a direction crossing the direction in which the winding 11 is wound. In this configuration, as shown in FIGS. 2 and 7, the gas flow path 16 has one end provided on the end of the protrusion 19 provided on the insulator 13 and the other end provided on the outer surface of the molded motor 1. At this time, the space between the adjacent protrusions 19 becomes a passage for the cracked gas. As a result, it is possible to smoothly guide the decomposition gas generated in the mold motor 1 to the gas flow path 16B.
　本発明の利用分野は、巻線が巻装された固定子鉄心がモールド樹脂によってモールドされる固定子を備え、この固定子がモールド樹脂によりモールド成形されるモールドモータについて、広範囲に利用することができる。 The field of application of the present invention includes a stator in which a stator core around which a winding is wound is molded with a mold resin, and the stator motor is molded with a mold resin. it can.
　１　　モールドモータ
　２，３　　玉軸受（軸受）
　４　　ブラケット
　４Ａ　　環状部
　１０　　固定子
　１１　　巻線
　１１Ａ　　芯線
　１１Ｂ　　第１の絶縁被膜
　１１Ｃ　　第２の絶縁被膜
　１１Ｄ　　潤滑被膜
　１１Ｅ　　最外周部
　１２　　ステータコア（固定子鉄心）
　１３　　インシュレータ（絶縁部材）
　１３Ａ，１３Ｂ，１３Ｃ　　端部
　１４　　モールドフレーム（モールド樹脂）
　１５　　溝部
　１６，１６Ａ，１６Ｂ，１６Ｃ，１６Ｄ，１６Ｅ　　ガス流路
　１７　　スロット
　１８　　ティース
　１９　　突条
　２０　　回転子
　２１　　回転体
　２２　　回転軸
　２３　　永久磁石 1 Molded motor 2, 3 Ball bearing (bearing)
4 Bracket 4A Annular part 10 Stator 11 Winding 11A Core wire 11B First insulating film 11C Second insulating film 11D Lubricating film 11E Outermost peripheral part 12 Stator core (stator core)
13 Insulator (insulating member)
13A, 13B, 13C End 14 Mold frame (mold resin)
15 Groove 16, 16A, 16B, 16C, 16D, 16E Gas flow path 17 Slot 18 Teeth 19 Projection 20 Rotor 21 Rotor 22 Rotating shaft 23 Permanent magnet

Claims (5)

  1. 巻線が巻装されるとともにスロットを有する固定子鉄心を、モールド樹脂によってモールドした固定子と、
    前記固定子に対向して周方向に永久磁石を有する回転体と、前記回転体の軸芯を貫通する回転軸とを含む回転子と、
    前記回転軸を回転自在に挟持する一対の軸受と、を備え、
    前記モールド樹脂は、前記固定子で生じたガスを前記モールド樹脂の外部へと導くガス流路を有するモールドモータ。     A stator in which a winding is wound and a stator core having a slot is molded with a mold resin;
    A rotor including a rotating body facing the stator and having a permanent magnet in the circumferential direction; and a rotating shaft penetrating an axis of the rotating body;
    A pair of bearings rotatably holding the rotating shaft,
    The mold resin has a gas flow path that guides gas generated in the stator to the outside of the mold resin.
  2. 前記ガス流路は、前記スロットの位置に前記ガス流路の一端を設けた請求項１に記載のモールドモータ。 The mold motor according to claim 1, wherein the gas flow path is provided with one end of the gas flow path at a position of the slot.
  3. さらに、前記巻線と前記固定子鉄心との間に絶縁部材を備え、
    前記絶縁部材は、前記巻線が巻装される方向とは交差する方向に形成された溝部を有し、この溝部の一端は、前記ガス流路の一端と連絡する請求項１に記載のモールドモータ。     Furthermore, an insulating member is provided between the winding and the stator core,
    2. The mold according to claim 1, wherein the insulating member has a groove formed in a direction intersecting a direction in which the winding is wound, and one end of the groove communicates with one end of the gas flow path. motor.
  4. さらに、前記巻線と前記固定子鉄心との間に絶縁部材を備え、
    前記絶縁部材は、前記巻線が巻装される方向とは交差する方向に形成された突条を有し、この突条の一端は、前記ガス流路の一端と連絡する請求項１に記載のモールドモータ。     Furthermore, an insulating member is provided between the winding and the stator core,
    2. The insulating member according to claim 1, wherein the insulating member has a protrusion formed in a direction intersecting a direction in which the winding is wound, and one end of the protrusion communicates with one end of the gas flow path. Mold motor.
  5. 前記ガス流路は、前記固定子鉄心へ巻装された前記巻線の最外周部に前記ガス流路の一端を設けた請求項１から４のいずれか一項に記載のモールドモータ。 5. The molded motor according to claim 1, wherein the gas flow path is provided with one end of the gas flow path at an outermost peripheral portion of the winding wound around the stator core. 6.
PCT/JP2013/001080 2012-03-01 2013-02-26 Molded motor WO2013128881A1 (en)

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