WO2022176794A1 - ステータ - Google Patents

ステータ Download PDF

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Publication number
WO2022176794A1
WO2022176794A1 PCT/JP2022/005574 JP2022005574W WO2022176794A1 WO 2022176794 A1 WO2022176794 A1 WO 2022176794A1 JP 2022005574 W JP2022005574 W JP 2022005574W WO 2022176794 A1 WO2022176794 A1 WO 2022176794A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
slot
coil
core
insulating resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/005574
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
慎太郎 森野
康 田村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Wiring Systems Ltd, AutoNetworks Technologies Ltd, Sumitomo Electric Industries Ltd filed Critical Sumitomo Wiring Systems Ltd
Priority to JP2023500816A priority Critical patent/JP7468774B2/ja
Priority to CN202280012328.8A priority patent/CN116762260A/zh
Priority to US18/546,442 priority patent/US12573907B2/en
Priority to DE112022001114.9T priority patent/DE112022001114T5/de
Publication of WO2022176794A1 publication Critical patent/WO2022176794A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/30—Windings characterised by the insulating material
    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
    • H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation

Definitions

  • the present disclosure relates to stators.
  • Patent Documents 1 and 2 disclose stators. This stator has a coil fixed to a stator core via insulating paper.
  • an object of the present disclosure is to provide a technique capable of improving the heat dissipation of the coil.
  • the stator of the present disclosure is comprising a stator core and a coil
  • the stator core has an annular yoke portion and a plurality of annularly arranged tooth portions, each of the teeth protrudes from the yoke,
  • the coil has a winding that passes through the slot and is wound around the teeth,
  • the winding comprises a core wire forming a conductive path and a covering portion covering the core wire, In the slot, the insulating resin is continuously filled between the inner wall of the tooth portion and the covering portion.
  • FIG. 1 is a perspective view of the stator core of the first embodiment.
  • FIG. FIG. 2 is a cross-sectional view around a coil arranged in a slot.
  • FIG. 3 is a cross-sectional view taken along line AA in FIG.
  • FIG. 4 is an explanatory diagram illustrating that the stator core of the first embodiment can increase the maximum torque of the motor.
  • FIG. 5 is an explanatory diagram illustrating that the stator core stack thickness of the stator core of the first embodiment can be reduced.
  • FIG. 6 is an explanatory diagram explaining that the cross-sectional area of the core wire can be reduced by the stator core of the first embodiment.
  • FIG. 7 is an explanatory diagram explaining that the stator core of the first embodiment can increase the effective magnetic flux.
  • a stator core and a coil are provided, and the stator core has an annular yoke portion and a plurality of annularly arranged tooth portions.
  • the winding includes a core wire forming a conductive path and a covering portion covering the core wire, and the insulating resin is continuously applied within the slot between the inner wall of the tooth portion and the covering portion. is filled with the stator.
  • the insulating resin is continuously filled between the inner wall of the tooth portion and the covering portion in the slot without the interposition of the insulating paper. , the heat dissipation of the coil can be improved.
  • the insulating resin is continuously filled in the configuration extending from the upper end side to the lower end side of the tooth portion, so that the heat dissipation can be further improved. Moreover, the state in which the coil is fixed within the slot can be further stabilized.
  • the insulation between the coil and the stator core can be ensured more reliably.
  • the insulation between the coil and the stator core can be ensured more reliably, and the thickness of the covering portion can be easily suppressed, so the core wire can be made thicker. Therefore, it is easy to improve the performance of the motor.
  • the stator 1 of the first embodiment is used as a part of a rotating electric machine (specifically, a motor).
  • the stator 1 includes a stator core 10, coils 30, and insulating resin 50, as shown in FIG.
  • the radial direction of the stator 1 is called the radial direction
  • the axial direction of the stator 1 is called the axial direction
  • the circumferential direction of the stator 1 is called the circumferential direction.
  • the stator core 10 has a yoke portion 11 and teeth portions 12, as shown in FIG.
  • the yoke portion 11 has an annular shape, more specifically an annular shape.
  • a plurality of teeth portions 12 are provided in a ring along the inner peripheral surface of the yoke portion 11 .
  • Each tooth portion 12 is spaced apart from each other in the circumferential direction.
  • Each tooth portion 12 protrudes radially inward from the inner peripheral surface of the yoke portion 11 .
  • Each tooth portion 12 has a wall shape along the radial direction and the axial direction.
  • Each tooth portion 12 has a wall-shaped tooth body 13 along the radial direction and the axial direction, and an overhang projecting from the tip portion (in other words, the radially inner end portion) of the tooth body 13 to both sides in the circumferential direction. a portion 14;
  • the stator core 10 may be, for example, a laminated steel plate manufactured by laminating a plurality of electromagnetic steel plates (for example, silicon steel plates) in the thickness direction, or may be a compacted powder formed by press-molding magnetic particles coated with insulation. It may be a magnetic core.
  • two adjacent tooth portions 12 form a slot 20.
  • the slots 20 are defined by the tooth portions 12 on both sides in the circumferential direction, and by the yoke portions 11 on the radial outer surface.
  • the slots 20 are open on both axial and radial inner surfaces of the stator 1 .
  • the coil 30 may be distributed winding or concentrated winding.
  • the coil 30 has a wire 31 that passes through the slot 20 and is wound around the teeth 12, as shown in FIG.
  • the winding 31 includes a core wire 32 forming a conductive path and a covering portion 33 covering the core wire 32 .
  • the core wire 32 is a conductor.
  • the covering portion 33 forms an insulating layer.
  • the material of the covering portion 33 is not particularly limited.
  • the covering portion 33 is a low dielectric constant enamel having a low dielectric constant in this embodiment.
  • the covering portion 33 is mainly composed of a thermosetting resin such as polyvinyl formal, thermosetting polyurethane, thermosetting acrylic, epoxy, thermosetting polyester, thermosetting polyesterimide, aromatic polyamide, thermosetting polyamideimide, and thermosetting polyimide. good too.
  • the covering portion 33 may be made mainly of a thermoplastic resin such as polyetherimide, polyphenylene ether, polyether sulfone, polyphenylene sulfide, polyether ether ketone, or thermoplastic polyimide.
  • the "main component” is the component with the largest content, for example, a component containing 50% by mass or more.
  • the slot 20 is filled with an insulating resin 50 .
  • a filling method is not particularly limited.
  • the filling method is, for example, transfer molding.
  • the type of insulating resin is not particularly limited. Types of insulating resin include, for example, epoxy resin, PBT resin, PET resin, PPS resin, SPS resin, m-PPE resin, nylon resin (PA6, PA46, PA66), aromatic nylon resin (PA4T, PA6T, PA9T, PA10T ), LCP resin and the like are preferred.
  • the insulating resin 50 is continuously filled in the slot 20 between the inner wall 12A of the tooth portion 12 and the covering portion 33 of the winding 31.
  • the insulating resin 50 is continuously filled between the inner wall 12A of the tooth portion 12 and the covering portion 33 in the slots 20 without the interposition of insulating paper. Therefore, the stator 1 can improve heat dissipation of the coil 30 as compared with a configuration in which insulating paper is interposed. For example, when varnish is impregnated into insulating paper, an air layer is likely to occur, and as a result, the heat dissipation tends to decrease.
  • the winding 31 has a plurality of insertion portions 34 arranged in the same slot 20 .
  • the insertion portion 34 includes the core wire 32 and the covering portion 33 described above.
  • the plurality of insertion portions 34 are arranged side by side in the radial direction.
  • the insulating resin 50 is also continuously filled between two insertion portions 34 arranged adjacent to each other in the same slot 20 . For this reason, it is easy to improve heat dissipation even between two insertion portions 34 that are arranged adjacent to each other in the same slot 20 .
  • the insulating resin 50 is continuously filled with the insulating resin 50 so as to extend from the upper end portion 12B side to the lower end portion 12C side of the tooth portion 12 . Therefore, the stator 1 can further improve heat dissipation. Moreover, the state in which the coil 30 is fixed within the slot 20 can be further stabilized.
  • the inner wall 20A of the slot 20 is spaced apart from the windings 31 throughout. Therefore, the stator 1 can ensure the insulation between the coils 30 and the stator core 10 more reliably.
  • the covering portion 33 is made of low dielectric constant enamel. Therefore, in the stator 1, the insulation between the coils 30 and the stator core 10 can be ensured more reliably, and the thickness of the covering portion 33 can be easily reduced, so that the core wire 32 can be easily thickened. That is, the space factor, which is the ratio of the core wires 32 occupying the slot 20, can be improved. Therefore, it is easy to improve the performance (for example, torque) of the motor. Moreover, insulation can be ensured only by the covering portion 33 . In other words, the insulating resin 50 can be continuously filled into the slot 20 to improve the heat dissipation, and the insulating property can be ensured by the covering portion 33 of the low dielectric constant enamel.
  • the insulating resin 50 is continuously filled between the inner wall 12A of the tooth portion 12 and the covering portion 33 in the slot 20 without an insulating paper interposed therebetween. can be improved.
  • the covering portion 33 is made of low dielectric constant enamel.
  • insulation can be ensured by the winding 31 alone.
  • the insulating paper is removed and the slots 20 are continuously filled with the insulating resin 50 to improve the heat dissipation, while the low dielectric constant enamel covering portion 33 enhances the insulating property. can be guaranteed.
  • the core wire 32 When current flows through the coil 30, the core wire 32 generates heat.
  • the upper limit of the current flowing through the core wire 32 is determined based on the upper limit of the allowable temperature range of the core wire 32 .
  • heat dissipation is improved, so the upper limit of the current flowing through the core wire 32 is increased. That is, according to the stator 1 , the upper limit of the current flowing through the core wire 32 can be increased without changing the size of the stator 1 .
  • the maximum torque of the motor is proportional to the current flowing through the coil 30 . Therefore, according to the stator 1, the maximum torque of the motor to which the stator 1 is applied can be increased. For example, as shown in FIG. 4, the maximum torque can be increased by the second area AR2 as compared to the first area AR1 corresponding to the stator provided with insulating paper.
  • the laminated thickness (length in the axial direction) of the stator core 10 can be reduced without changing the applied maximum torque of the motor.
  • the stack thickness of the stator core 10 is proportional to the maximum applied torque of the motor. That is, the thickness of the stator core 10 can be reduced without changing the maximum torque of the motor.
  • the stack thickness (length in the axial direction) of the stator core 10 is reduced while maintaining the same maximum torque of the motor to be applied. be able to.
  • the laminated thickness of the stator core 10 By reducing the laminated thickness of the stator core 10, the amount of material used is reduced, and as a result, the material cost is reduced.
  • the stator cores 10 and 10X are schematically drawn.
  • the cross-sectional area of the core wire 32 can be reduced without changing the applied maximum torque of the motor and the laminated thickness (length in the axial direction) of the stator core 10 .
  • the current flowing through the core wire 32 is proportional to the cross-sectional area of the core wire 32 . That is, the cross-sectional area of the core wire 32 can be reduced without changing the current flowing through the core wire 32 (maximum torque of the motor applied) and the stack thickness (length in the axial direction) of the stator core 10 .
  • the width dimension (length in the circumferential direction) of the core wire 32 can be made smaller than the core wire 32Y of the stator 1Y provided with insulating paper (not shown).
  • the amount of material used for the core wire 32 can be reduced, resulting in reduced material costs. Further, even if the thickness (the length in the circumferential direction) of the teeth portion 12 is increased as shown in FIG. A lower price per unit volume reduces overall material costs.
  • the effective magnetic flux 60 is increased by increasing the thickness (length in the circumferential direction) of the tooth portion 12 compared to the tooth portion 12Z where the leakage magnetic flux 61 exists.
  • the maximum torque of the motor is proportional to the effective flux. Therefore, according to this configuration, the maximum torque of the motor to which the stator 1 is applied can be increased.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
PCT/JP2022/005574 2021-02-18 2022-02-14 ステータ Ceased WO2022176794A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2023500816A JP7468774B2 (ja) 2021-02-18 2022-02-14 ステータ
CN202280012328.8A CN116762260A (zh) 2021-02-18 2022-02-14 定子
US18/546,442 US12573907B2 (en) 2021-02-18 2022-02-14 Stator having slots filled with resin for insulation
DE112022001114.9T DE112022001114T5 (de) 2021-02-18 2022-02-14 Stator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-024027 2021-02-18
JP2021024027 2021-02-18

Publications (1)

Publication Number Publication Date
WO2022176794A1 true WO2022176794A1 (ja) 2022-08-25

Family

ID=82930577

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/005574 Ceased WO2022176794A1 (ja) 2021-02-18 2022-02-14 ステータ

Country Status (5)

Country Link
US (1) US12573907B2 (https=)
JP (1) JP7468774B2 (https=)
CN (1) CN116762260A (https=)
DE (1) DE112022001114T5 (https=)
WO (1) WO2022176794A1 (https=)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12573907B2 (en) * 2021-02-18 2026-03-10 Autonetworks Technologies, Ltd. Stator having slots filled with resin for insulation
JP7695098B2 (ja) * 2021-04-14 2025-06-18 株式会社日立産機システム 回転電機

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014154262A (ja) * 2013-02-05 2014-08-25 Furukawa Electric Co Ltd:The 耐インバータサージ絶縁ワイヤ
JP2018107921A (ja) * 2016-12-27 2018-07-05 トヨタ自動車株式会社 回転電機のステータ

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4998450B2 (ja) * 2008-12-09 2012-08-15 トヨタ自動車株式会社 ステータの製造方法
JP2013062911A (ja) 2011-09-12 2013-04-04 Toyota Motor Corp モータ用の絶縁シートとステータコアにコイルを固定する方法
JP2017163797A (ja) 2016-03-11 2017-09-14 本田技研工業株式会社 電動機用ステータの製造方法および電動機用ステータ
EP3547506B1 (en) * 2016-11-28 2026-03-25 Panasonic Intellectual Property Management Co., Ltd. Motor
CN110383643B (zh) * 2017-02-28 2021-04-02 松下知识产权经营株式会社 模制马达
JP7092617B2 (ja) 2018-08-29 2022-06-28 日立Astemo株式会社 回転電機の固定子の製造方法
US12573907B2 (en) * 2021-02-18 2026-03-10 Autonetworks Technologies, Ltd. Stator having slots filled with resin for insulation
CN115441643A (zh) * 2021-06-03 2022-12-06 株式会社牧田 电动作业机
JP2022185821A (ja) * 2021-06-03 2022-12-15 株式会社マキタ 電動作業機

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014154262A (ja) * 2013-02-05 2014-08-25 Furukawa Electric Co Ltd:The 耐インバータサージ絶縁ワイヤ
JP2018107921A (ja) * 2016-12-27 2018-07-05 トヨタ自動車株式会社 回転電機のステータ

Also Published As

Publication number Publication date
JP7468774B2 (ja) 2024-04-16
JPWO2022176794A1 (https=) 2022-08-25
US12573907B2 (en) 2026-03-10
DE112022001114T5 (de) 2023-12-14
CN116762260A (zh) 2023-09-15
US20240186857A1 (en) 2024-06-06

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