WO2022195916A1 - Stator et machine électrique tournante le comprenant - Google Patents

Stator et machine électrique tournante le comprenant Download PDF

Info

Publication number
WO2022195916A1
WO2022195916A1 PCT/JP2021/030908 JP2021030908W WO2022195916A1 WO 2022195916 A1 WO2022195916 A1 WO 2022195916A1 JP 2021030908 W JP2021030908 W JP 2021030908W WO 2022195916 A1 WO2022195916 A1 WO 2022195916A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulating coating
stator
coil
windings
neutral point
Prior art date
Application number
PCT/JP2021/030908
Other languages
English (en)
Japanese (ja)
Inventor
孝仁 村木
慎司 山崎
源三 岩城
Original Assignee
日立Astemo株式会社
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 日立Astemo株式会社 filed Critical 日立Astemo株式会社
Priority to CN202180095387.1A priority Critical patent/CN116998091A/zh
Publication of WO2022195916A1 publication Critical patent/WO2022195916A1/fr

Links

Images

Classifications

    • 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
    • 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
    • H02K3/38—Windings characterised by the shape, form or construction of the insulation around winding heads, equalising connectors, or connections thereto
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the present invention relates to a stator and a rotating electric machine having the same.
  • Patent Literature 1 discloses a technique for realizing both miniaturization, high voltage, and high output of a rotating electrical machine by configuring the slots and coil end portions with different insulating layer thicknesses or different insulating materials. ing.
  • Patent Document 2 discloses a technique for increasing the insulation resistance by increasing the thickness of the insulating coating at a predetermined portion of the conductor, and ensuring the insulation performance between the joint and the adjacent segment conductor when the segment conductors are joined together. is disclosed.
  • Non-Patent Document 1 describes the principle of surge generation in an inverter-driven motor, the surge entering the motor and the voltage between turns, etc.
  • Non-Patent Document 1 describes that when a surge enters a motor coil, most of the surge voltage is applied to the first turn of the coil, that the voltage rise time may be 50 ns or less, and that the voltage pulse and the turn in the first turn It is described that a voltage between adjacent turns is generated due to a difference from the delayed voltage pulse after passage.
  • Non-Patent Document 1 it is generally known that a voltage between adjacent turns is generated. has not been clarified.
  • the object of the present invention is to prevent dielectric breakdown in a specific range where the potential difference is large in the windings that make up the coils of the stator.
  • the present invention is a stator that constitutes a rotating electric machine, and includes a stator core and a coil, and the coil has a plurality of phase windings, a lead wire, and a plurality of phase windings electrically connected to each other.
  • the winding includes a conductor, a first insulating coating and a second insulating coating covering the conductor, the second insulating coating being greater than the first insulating coating
  • the range of the second insulating coating covering the conductor is 20 to 50% of the total length of the winding on the neutral point side.
  • FIG. 1 is a cross-sectional view showing a rotating electric machine according to an embodiment
  • FIG. 1 is a perspective view showing a stator of a rotary electric machine according to an embodiment
  • FIG. 3 is a schematic configuration diagram showing a coil having star connection
  • FIG. 4 is a schematic configuration diagram showing a coil having four reciprocating windings
  • the present disclosure relates to a stator having a structure with excellent insulating properties and a rotating electric machine having the same.
  • the present inventors proceeded with measurements of the voltage sharing ratio of the stator, etc., and found that due to the propagation delay of the potential, in a specific range from the neutral point of the windings constituting the stator coil , that the potential is significantly different from that of the lead wire.
  • the surge resistance of the second insulating coating is made higher than that of the first insulating coating, and the second It has been found that it is desirable to cover the conductor with the insulating coating of 20 to 50% of the total length of the winding on the neutral point side.
  • the insulating coating used for the windings that constitute the stator of the present disclosure will be described in detail below.
  • Both the first insulating coating and the second insulating coating contain an electrically insulating resin.
  • resins include polyvinyl formal, polyester, polyesterimide, polyamideimide, polyimide, nylon, polyoxymethylene, polyphenylene sulfide, polyetheretherketone, and polytetrafluoroethylene.
  • polyester, polyesterimide, polyamideimide and polyimide are preferred from the viewpoint of heat resistance, workability and adhesiveness.
  • the resin may be used singly or may be used by laminating a plurality of resins.
  • the multi-layer means is not particularly limited, and existing techniques such as baking coating and multi-layer extrusion can be used. It is desirable that these resins are the same within one segment coil before welding. In other words, the segment coil desirably has only one of the first insulating coating and the second insulating coating.
  • Component that improves surge resistance Techniques for improving surge resistance include adding inorganic particles and lowering the dielectric constant.
  • Inorganic particles may be electrically insulating, such as silica, alumina, and mica. These may be used singly or in combination of two or more.
  • Examples of the addition of inorganic particles include the method of using polyamide-imide for the first insulating coating and nano-silica particle-added polyamide-imide for the second insulating coating.
  • the base material resin is selected from the above resin group, and may be used singly or in multiple types.
  • the dielectric constant there is a method of using polyamide-imide with a dielectric constant of 4 for the first insulating coating and polyimide with a dielectric constant of 3.5 for the second insulating coating.
  • the combination of these resins is not particularly limited as long as the dielectric constant of the second insulating coating is lower than that of the first insulating coating.
  • the portions to which the second insulating coating is applied are the lead wire that is the input portion of the power source, and are between the lead wire and the neutral point and are adjacent to the neutral point of the encircling winding portion that constitutes the encircling winding. It is preferable that it is the side and is a portion of 20 to 50% of the total length of the winding portion. This portion is a portion where the potential difference increases due to the rise of the pulse when power is input.
  • the resin thickness that improves the surge resistance of the second insulating coating is preferably 5% or more and less than 100% of the whole, more preferably 20% or more. less than 60%.
  • the film thickness of both the first insulating film and the second insulating film is not particularly limited as long as the film thickness is selected to be suitable for the power supply voltage.
  • the electric motor used for a hybrid vehicle is used as an example of a rotary electric machine.
  • axial direction refers to the direction along the rotating shaft of the rotating electric machine.
  • circumferential direction refers to the direction along the rotation direction of the rotating electric machine.
  • Ring direction refers to a radial direction (radial direction) around the rotating shaft of the rotating electric machine.
  • inner peripheral side refers to the radially inner side (inner diameter side)
  • the “outer peripheral side” refers to the opposite direction, that is, the radial outer side (outer diameter side).
  • FIG. 1 is a cross-sectional view showing an example of a rotating electric machine according to an embodiment.
  • the rotating electrical machine 10 includes a rotor 11 , a stator 20 and a housing 50 .
  • Rotor 11 includes rotor core 12 and rotating shaft 13 .
  • the rotor 11 is provided with permanent magnets 18 and end rings (not shown).
  • the stator 20 includes a stator core 21 (stator core).
  • a stator 20 having a coil 40 is fixed to the inner peripheral side of the housing 50 .
  • a rotor 11 is rotatably installed on the inner peripheral side of the stator 20 .
  • the housing 50 forms a cylindrical outer cover of the rotating electric machine 10 by cutting a ferrous material such as carbon steel, by casting cast steel or an aluminum alloy, or by pressing.
  • the housing 50 is also called a frame or frame.
  • a liquid cooling jacket 130 is installed on the outer peripheral side of the housing 50 .
  • a gap provided between the inner peripheral wall of the liquid cooling jacket 130 and the outer peripheral wall of the housing 50 is a coolant passage 153 for a liquid coolant 157 such as oil.
  • the refrigerant passage 153 is configured so as not to leak.
  • Liquid cooling jacket 130 has bearings 144, 145 and may also be referred to as a "bearing bracket.”
  • coolant 157 flows through coolant passage 153 and flows out from coolant outlets 154 and 155 toward stator 20 to cool stator 20 . Thereafter, refrigerant 157 is temporarily stored in refrigerant reservoir 150 and circulated by a pump installed outside.
  • the stator core 21 has a structure in which thin silicon steel plates are laminated.
  • the heat generated by the coils 40 installed in the stator 20 is transmitted to the housing 50 via the stator core 21, transferred to the outside by the coolant 157 flowing through the liquid cooling jacket 130, and radiated.
  • the rotor core 12 has a structure in which thin silicon steel plates are laminated.
  • a rotating shaft 13 of the rotor 11 is fixed to the center of the rotor core 12 .
  • the rotating shaft 13 is rotatably supported by bearings 144 and 145 attached to the liquid cooling jacket 130 .
  • the rotor 11 rotates at a predetermined position inside the stator 20 and at a position facing the stator 20 .
  • the stator 20 is inserted inside the housing 50 and attached to the inner peripheral wall of the housing 50 in advance, and then the rotor 11 is inserted into the stator 20 .
  • the rotating shaft 13 is assembled to the liquid cooling jacket 130 so that the bearings 144 and 145 are fitted.
  • FIG. 2 is a perspective view showing an example of the stator of the rotary electric machine according to the embodiment.
  • the stator 20 includes a stator core 21 and a stator coil 60.
  • the stator coil 60 is wound around a number of slots 15 provided in the inner circumference of the stator core 21 .
  • the stator 20 includes a stator core 21 and stator coils 60 wound in a number of slots 15 provided in the inner periphery of the stator core 21 .
  • the stator coil 60 is made of a conductor having a substantially rectangular cross section and has an insulating coating.
  • the conductor is made of a copper alloy.
  • a slot liner 301 is provided in each slot 15, and an insulating paper 300 is provided around the outer periphery of the stator core 21 to ensure electrical insulation and adhesion between the stator core 21 and the stator coil 60 and the like.
  • the slot liner 301 is formed in a square shape, a B shape, or an S shape so as to wrap the copper wire.
  • a stator coil 60 is formed by inserting a segmented coil into the slot 15 provided with the slot liner 301 and welding it. Thereafter, the slots 15 are impregnated with a bonding varnish and heated to bond the coils. That is, the windings of the stator coil 60 are composed of segment coils.
  • the stator coil 60 has lead wires 26 a , 26 b , 26 c and a neutral point 27 .
  • the lead wires 26a, 26b, 26c and the neutral point 27 are arranged close to each other.
  • the rotor can be not only the permanent magnet type but also the induction type. , synchronous reluctance, claw magnetic pole type, etc.
  • the winding method is the wave winding method, any winding method having similar characteristics can be applied.
  • the adductor type has been described, it is also applicable to the abductor type.
  • FIG. 3 is a schematic configuration diagram showing a coil with star connection.
  • the stator coil 40 has lead wires 26a, 26b, 26c and a neutral point 27.
  • the lead wires 26a, 26b, 26c and the neutral point 27 are connected by three-phase windings. Moreover, the lead wires 26a, 26b, 26c and the neutral point 27 are actually arranged close to each other.
  • a second insulating coating 402 covers the windings in range. That is, 25% of the entire winding is covered with the second insulating coating 402 from the neutral point 27 .
  • the remaining portion of the winding indicated by the dashed line (75% range from the lead wire 26a) is covered with the first insulating coating 401.
  • the lead wires 26 a , 26 b , 26 c and the neutral point 27 are also covered with the second insulating coating 402 .
  • FIG. 4 is a schematic configuration diagram showing a coil having four reciprocating windings.
  • the coil 40 shown in this figure is schematically represented as having a lead wire 46 and a neutral point 47 for one of the three phases in order to clarify the reciprocating structure of the windings.
  • the coil 40 has a configuration including a first turn 41, a second turn 42, a third turn 43 and a fourth turn 44 from the lead wire 46 toward the neutral point 47. Each of these turns constitutes one round trip winding.
  • the present inventor conducted extensive experimental studies on applying a pulse voltage on the order of MHz to a coil, and found that 20 to 50% of the entire winding from the neutral point can be covered with the second insulating coating. I have come to the conclusion that it is desirable. In other words, it is desirable that the area covered by the second insulating coating in the round winding is 20 to 50% of the total length of the round winding on the neutral point side.
  • the lower limit of the range covered by the second insulating coating is based on the results of dielectric breakdown life tests in Examples, Comparative Examples, etc. described later.
  • the upper limit of the range it goes without saying that if the range covered by the second insulating film is widened, a sufficient life can be obtained. If the range covered with the insulating film is made wider than necessary, it is against not only the cost but also the weight reduction of the coil. Therefore, the upper limit of the range is preferably 50%. More preferably, it is 40%, and particularly preferably 30%. This is because, as will be described later, even at 25%, the same level of dielectric breakdown life as in the case of 100% coverage was obtained.
  • FIG. 4 shows a coil having four round trip windings, but in the case where the coil has eight round trip windings, similarly, the range covered with the second insulating coating in the round winding is 20 to 50% of the total length of the center point side is desirable. That is, if the winding of the coil has eight reciprocations, it is sufficient to cover about two reciprocations of the windings on the neutral point side with the second insulating coating.
  • the ends of the lead wires and the neutral point, and of the windings (circular windings) forming the coil located between the lead wires and the neutral point, the neutral point side A predetermined portion is covered with a second insulating coating, and the rest of the circular winding is covered with a first insulating coating.
  • the second insulating coating has better surge resistance than the first insulating coating.
  • the thickness (film thickness) of the first insulating coating and the second insulating coating is equal to 70 ⁇ m.
  • Polyamide-imide containing no inorganic fine particles was used as the first insulating coating.
  • the second insulating coating 60% of the total film thickness used polyamide-imide containing nanosilica fine particles. That is, for a thickness of 70 ⁇ m, a polyamide-imide containing no inorganic particles is used for a thickness of 28 ⁇ m, and a polyamide-imide containing inorganic particles is used for a thickness of 42 ⁇ m.
  • the area covered with the second insulating film in the round winding was set to 25% of the entire length of the round winding on the neutral point side (the same portion as in FIG. 3).
  • the first insulating coating 20% of the total film thickness used polyamide-imide containing nanosilica fine particles.
  • the second insulating coating 60% of the total film thickness used polyamide-imide containing nanosilica fine particles.
  • the area covered by the second insulating film in the round winding was set to 25% of the entire length of the round winding on the neutral point side.
  • the second insulating coating 60% of the total film thickness used polyamide-imide containing nanosilica fine particles.
  • the area covered with the second insulating film in the round winding was set to 15% of the total length of the round winding on the neutral point side.
  • Polyamide-imide containing nanosilica fine particles in 60% of the total film thickness was used as the insulating coating in the entire range of the winding wire. That is, the entire range was covered with the second insulating coating without using the first insulating coating.
  • the portion to which the first insulating coating is applied and the portion to which the second insulating coating is applied are, respectively, the segment coil having the first insulating coating and the second insulating coating. Since either one of the segment coils having the insulating coating can be appropriately selected when inserting the core, it is possible to manufacture using conventional manufacturing equipment.
  • Table 1 shows the test results.
  • stator according to the present disclosure and the rotary electric machine having the same can reduce the amount of the high-cost, surge-resistant insulating coating and improve the insulating properties.
  • stator and the rotating electric machine having the same according to the present disclosure are not limited to the above examples, and include various modifications.
  • the above embodiments are described in detail for easy understanding of the configurations of the stator and the like according to the present disclosure, and are not necessarily limited to those having all the configurations described.

Landscapes

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

Abstract

Ce stator constitue une machine électrique tournante et comprend un noyau de stator et des bobines, les bobines ayant des enroulements ayant une pluralité de phases, un fil de sortie, et un point neutre auquel les enroulements ayant la pluralité de phases sont connectés électriquement. Les enroulements comprennent un conducteur et des première et seconde couches isolantes recouvrant le conducteur. Le second revêtement isolant présente des propriétés anti-surtension supérieures à celles du premier revêtement isolant, et une zone à l'intérieur de laquelle le second revêtement isolant recouvre le conducteur équivaut à une partie allant de 20 à 50 % de la longueur totale des enroulements sur le côté du point neutre. Ceci permet d'empêcher une rupture d'isolation dans une zone spécifique dans laquelle la différence de potentiel devient plus grande dans les enroulements constituant la bobine du stator.
PCT/JP2021/030908 2021-03-18 2021-08-24 Stator et machine électrique tournante le comprenant WO2022195916A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202180095387.1A CN116998091A (zh) 2021-03-18 2021-08-24 定子及具有定子的旋转电机

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021044465A JP7460571B2 (ja) 2021-03-18 2021-03-18 固定子及びこれを有する回転電機
JP2021-044465 2021-03-18

Publications (1)

Publication Number Publication Date
WO2022195916A1 true WO2022195916A1 (fr) 2022-09-22

Family

ID=83322169

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/030908 WO2022195916A1 (fr) 2021-03-18 2021-08-24 Stator et machine électrique tournante le comprenant

Country Status (3)

Country Link
JP (1) JP7460571B2 (fr)
CN (1) CN116998091A (fr)
WO (1) WO2022195916A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008253014A (ja) * 2007-03-29 2008-10-16 Toshiba Corp 高電圧用回転電機
JP2012175822A (ja) * 2011-02-22 2012-09-10 Toyota Motor Corp 回転電機ステータ
JP2019033202A (ja) * 2017-08-09 2019-02-28 富士電機株式会社 巻線構造、コイル、変圧器及び回転機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008253014A (ja) * 2007-03-29 2008-10-16 Toshiba Corp 高電圧用回転電機
JP2012175822A (ja) * 2011-02-22 2012-09-10 Toyota Motor Corp 回転電機ステータ
JP2019033202A (ja) * 2017-08-09 2019-02-28 富士電機株式会社 巻線構造、コイル、変圧器及び回転機

Also Published As

Publication number Publication date
JP7460571B2 (ja) 2024-04-02
JP2022143772A (ja) 2022-10-03
CN116998091A (zh) 2023-11-03

Similar Documents

Publication Publication Date Title
US6462453B1 (en) Stator for an alternator
RU2638165C1 (ru) Статор вращающейся электрической машины
KR101247085B1 (ko) 유도 모터 회로용 두 전도체 권선
JP4461590B2 (ja) 車両用交流発電機
JP6771537B2 (ja) アキシャルギャップ型回転電機
US11605993B2 (en) Rotary motors incorporating flexible printed circuit boards
JP2009268161A (ja) 回転電機の固定子及び回転電機
WO2017038326A1 (fr) Rotor, machine électrique tournante équipée de celui-ci et procédé de fabrication de rotor
JP2010011623A (ja) 回転電機
CN111835107A (zh) 旋转电机的转子
CN212486231U (zh) 定子和电机
KR102487162B1 (ko) 구동모터의 헤어핀 권선 타입 고정자
WO2019138693A1 (fr) Stator pour machine électrique tournante, et machine électrique tournante
JP6346112B2 (ja) 多相交流電動機
JP3476438B2 (ja) 車両用交流発電機
JP2015023750A (ja) 電動機
WO2022195916A1 (fr) Stator et machine électrique tournante le comprenant
JPWO2016194829A1 (ja) 回転電機
JPWO2019208032A1 (ja) 固定子、及び回転電機
JP6173842B2 (ja) 回転電機
US10763005B2 (en) Insulation for conductors
JP6852639B2 (ja) ステータ
JP5057144B2 (ja) 回転電機の固定子
WO2024185548A1 (fr) Stator de machine électrique tournante et son procédé de fabrication
JP2020068569A (ja) 回転電機のステータ

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21931660

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 202180095387.1

Country of ref document: CN

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21931660

Country of ref document: EP

Kind code of ref document: A1