WO2016035534A1 - Stator pour machine électrique rotative et ladite machine - Google Patents

Stator pour machine électrique rotative et ladite machine Download PDF

Info

Publication number
WO2016035534A1
WO2016035534A1 PCT/JP2015/072983 JP2015072983W WO2016035534A1 WO 2016035534 A1 WO2016035534 A1 WO 2016035534A1 JP 2015072983 W JP2015072983 W JP 2015072983W WO 2016035534 A1 WO2016035534 A1 WO 2016035534A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
coil
resin
electrical machine
rotating electrical
Prior art date
Application number
PCT/JP2015/072983
Other languages
English (en)
Japanese (ja)
Inventor
源三 岩城
萩原　修哉
Original Assignee
日立オートモティブシステムズ株式会社
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 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Publication of WO2016035534A1 publication Critical patent/WO2016035534A1/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
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/48—Fastening of windings on the stator or rotor structure in slots
    • 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 of a high-voltage rotating electrical machine that is operated with a driving voltage in the vicinity of 1 kV, and a rotating electrical machine including the stator.
  • Rotating electric machines closely related to industry and life are basic equipment that supports modern society.
  • the motor of the power source is required to be smaller and lighter from the viewpoint of securing the posting space and improving fuel efficiency by reducing the weight.
  • Stator insulation of power motors for hybrid vehicles and electric vehicles is an insulating paper (slot liner) inserted between the stator core / coil and between the different phase coils and a fixed varnish that fills the gaps and fixes the coil and slot liner to the core.
  • slot liner insulating paper
  • the thickness of the slot liner is increased, and an insulation distance corresponding to the working voltage is secured.
  • the coil space factor in the slot is increased.
  • the coil current decreases due to a decrease.
  • Another method, increasing the coil current density, is accompanied by an increase in coil temperature as described above, and an increase in coil temperature is unavoidable in miniaturization of power motors for hybrid vehicles and electric vehicles.
  • thermosetting resin is used for the fixing varnish used in the conventional stator insulation system in order to prevent the fixing force from being lowered even when the temperature rises during motor operation.
  • embrittlement of the resin is accelerated, cracks are generated in the fixed varnish layer, and the insulation reliability is lowered.
  • the present invention provides a stator for a rotating electrical machine equipped with a highly reliable insulation system capable of maintaining a high withstand voltage characteristic in which cracks are not easily generated in a fixed varnish even when a stator coil temperature rises and a high voltage is applied. It is an object to provide a rotating electrical machine including
  • the present application includes a plurality of means for solving the above-mentioned problems.
  • a stator for a rotating electrical machine including a coil having an insulating coating and a core provided with a plurality of slots in which the coils are arranged.
  • a composite resin containing a thermoplastic resin in a thermosetting resin is used for the slot fixing varnish.
  • stator for a rotating electrical machine that can reduce the deterioration of insulation reliability due to acceleration of embrittlement of the slot insulating fixed varnish accompanying the rise in stator coil temperature and crack generation, and a rotating electrical machine including the stator. It becomes possible.
  • the insulation reliability decreases with the increase in the temperature of experience of the insulation system, and the degree of the decrease is the thermosetting property of the fixed varnish.
  • the present inventors have found that it is strongly influenced by the resin and have reached the present invention.
  • a composite resin in which a thermoplastic resin is contained in a thermosetting resin is used for the fixing varnish, thereby enabling miniaturization of a high-voltage motor such as a hybrid motor or a power motor for an electric vehicle.
  • the composite resin is composed of a sea-like matrix phase and an island-like dispersed phase, wherein the matrix phase is made of a thermosetting resin and the island-like dispersed phase is made of a thermoplastic resin.
  • thermoplastic resin in the composite resin when a thermoplastic resin having poor ductility is combined with the thermosetting resin in the matrix phase, the effect of the present invention cannot be obtained.
  • the thermoplastic resin in the composite resin is not It is necessary that the ductility is higher than that of the thermosetting resin of the matrix phase.
  • a guideline for ductility can be represented by tensile elongation at break.
  • a thermoplastic resin having a tensile elongation at break larger than that of the thermosetting resin of the matrix phase is used.
  • thermoplastic resin having a dielectric constant lower than that of the thermosetting resin in the matrix phase as the dispersed phase in the composite resin in the present invention, the dielectric constant of the fixed varnish is lowered and the partial discharge start voltage in the status lot is increased. Therefore, the motor drive voltage can be increased.
  • thermoplastic resin having a thermal expansion coefficient larger than that of the matrix phase thermosetting resin in the dispersed phase allows the fixed varnish layer to be formed only from the thermosetting resin as the coil temperature rises during motor operation.
  • the thermal resistance from the coil to the core is reduced, that is, the coil cooling property is improved, and the coil temperature can be prevented from rising.
  • thermoplastic resin satisfying at least one of the above properties (tensile elongation at break, dielectric constant, coefficient of linear expansion) is used as a composite resin for status lot insulating fixed varnish.
  • stator composed of a laminated core of a punched electromagnetic steel plate equivalent to 35A300 with a rated driving voltage of 300Vdc and current of 400 Arms, a three-phase 12-pole hybrid vehicle drive motor with an outer diameter of 245mm, an inner diameter of 200mm, and 72 slots.
  • the present invention will be described with reference to Examples and Comparative Examples.
  • FIG. 1 shows a slot cross-sectional configuration of a stator core of a hybrid vehicle drive motor used in Examples and Comparative Examples.
  • Four stator coils 3 formed of a flat enamel insulated wire are accommodated in the slot 4, and each stator coil 3 is electrically insulated by the slot liner 2.
  • the slot liner 2 is a slot liner having a B-shaped cross section, which insulates each stator coil and insulates the stator coil 3 from the stator core 1 as described above.
  • the stator coil used was a rectangular enamel insulated wire in which a 0.05 mm thick polyamideimide insulating layer was coated on a rectangular conductor having a short side of 2.4 mm, a long side of 3.3 mm, and a corner chamfer radius of 0.5 mm.
  • slot liner a three-layer laminated insulating paper of aramid paper / PET / aramid paper with a nominal thickness of 0.18 mm was used. Each layer of the slot liner is bonded with a urethane-based adhesive.
  • the slot liner length was 100 mm, and a 3 mm slot liner was protruded from both end faces of the core slot to prevent creeping discharge between the stator core and the segment coil.
  • the slot has a substantially rectangular shape with a constant width in order to store the flat coil closely, and the width and the parallel part depth are 4.18 mm and 12.2 mm, respectively.
  • the stator is assembled by inserting a segment coil in which a flat enamel insulated wire is formed into a generally U shape after the slot liner is installed in the status lot.
  • the stator core / slot liner and slot liner / stator coil are assembled. There are gaps between them, as can be seen from the dimensional relationship of each member described above.
  • FIG. 2 shows a perspective view of the stator after assembly.
  • the stator 41 is manufactured by a rectangular wire segment winding method.
  • FIG. 2 is a perspective view of the stator 41 after the housing 44 is fitted. A state in which the segment coil connecting portion that is straight when the slot liner is inserted for connecting the segment coil 42 is bent into a predetermined shape is shown.
  • interlayer insulation paper was sandwiched between the stator coil layers on the weld side to ensure insulation between the stator coils.
  • interlayer insulating paper two sheets of the same insulating paper as the slot liner were used.
  • the stator After welding and joining the segment coil ends, the stator is inverted so that the flanges of the segment coils are on the top, and the fixed varnish is poured into the slots from the upper end of the stator core slot, and the stator is heated to a predetermined temperature, held, and fixed The varnish was cured, and the slot liner and the stator coil were fixed to the slot, and the stators of Examples and Comparative Examples of the present invention were manufactured.
  • Table 1 shows the thermoplastic resins used for the dispersed phases in the composite resins of Examples and Comparative Examples.
  • Comparative Example 1 is a conventional epoxy-based thermosetting resin that does not contain a dispersed phase.
  • the two-component mixed type has a viscosity after mixing of 0.9 mPa ⁇ s, a curing condition of 150 ° C. ⁇ 1 hour, and a glass transition temperature. It is an epoxy resin at 125 ° C.
  • each thermoplastic resin was combined with the epoxy resin of Comparative Example 1.
  • thermoplastic resins used in the composite resins of Examples 1 to 3 and Comparative Example 2 were 10 ⁇ m or less obtained by mechanically pulverizing and sieving bulk thermoplastic resins having the initial characteristics shown in Table 1 in liquid nitrogen. The fine resin powder was used.
  • the composite resin was depressurized and degassed with a rotary pump after mixing to prevent the formation of voids during curing, and then dropped and poured from the end of the slot using a dropper as described above.
  • the fixed phase varnish of the thermosetting resin of Comparative Example 1 was also depressurized and degassed in the same manner as the composite resin.
  • the dripping and pouring of the fixed varnish was performed by preheating the stator to about 70 ° C., and the flow of the fixed varnish in the slot and the gap filling property were improved.
  • the stator was put into a heating furnace and heated in the atmosphere at 150 ° C. for 1 hour to cure the fixed varnish, and the stators of Examples and Comparative Examples were manufactured.
  • a thermocouple for monitoring the actual temperature is attached to an arbitrary core tooth located in the axial center of each stator inner surface (one point), and the temperature is controlled, and the furnace is heated for 1 hour after the actual temperature reaches 150 ° C. After the inner holding, the stator with the fixed varnish cured was taken out of the furnace and air-cooled.
  • thermoplastic resin was uniformly dispersed as the dispersed phase 52 in the matrix phase 51 formed of the thermosetting resin.
  • Table 2 shows the evaluation results of the stator manufactured by applying the composite resin shown in Table 1.
  • the stators of the manufactured examples and comparative examples were thermally deteriorated under conditions simulating the rise in the coil temperature, and the partial discharge start voltage, the charging time until the dielectric breakdown at 1.2 kV charging were measured, and the insulation reliability was measured. Sex was compared and evaluated.
  • the coil cooling performance was evaluated by measuring the coil temperature after cooling the stator coil to about 200 ° C. for 10 minutes.
  • the definition of the partial discharge start voltage is that the rising voltage of the charge amount is the partial discharge start voltage, and in the dielectric breakdown test, the dielectric breakdown detection current is 10 mA.
  • U, V, and W phase coils of the prototype stator were connected in series as in the insulation reliability evaluation, and a DC current was energized and heated by a DC power source to rapidly heat only the stator coil.
  • the stator coil temperature was measured by being attached to an arbitrary slot opening at the center in the axial direction of the inner surface of the stator.
  • the evaluation results in Table 2 showed good partial discharge initiation voltage and dielectric breakdown characteristics corresponding to the initial tensile breaking elongation of the dispersed phase thermoplastic resin.
  • the dielectric breakdown time of the PPS composite resin of Comparative Example 2 resulted in dielectric breakdown before reaching 1.2 kV, resulting in lower insulation reliability than Comparative Example 1 using only the thermosetting resin as the fixed varnish. . This can be attributed to the fact that the embrittlement of the fixed varnish during thermal degradation was accelerated due to the composite of PPS having a tensile elongation at break that is lower than that of the epoxy thermosetting resin in the matrix phase.
  • Example 2 using a PTFE composite resin having a low dielectric constant for the fixing varnish has a higher value than the other examples.
  • Example 2 shows that the coil is rapidly cooled, and the effect of combining PTFE having a high linear expansion coefficient is clearly shown.
  • the effects of the present invention can be understood. That is, according to the present invention, acceleration of embrittlement of the slot insulation fixing varnish accompanying the rise in the stator coil temperature and prevention of deterioration of insulation reliability due to generation of cracks can be prevented, and a more compact stator and hybrid vehicle, electric vehicle power motor and It becomes possible to provide a rotating electrical machine using the same.
  • the present invention is particularly suitable for a high-voltage rotating electrical machine that is operated at a driving voltage in the vicinity of 1 kV.
  • this invention is not limited to the above-mentioned Example, Various modifications are included.
  • the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
  • a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.

Landscapes

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

Abstract

L'invention concerne : un stator pour une machine électrique rotative comprenant un système d'isolation extrêmement fiable qui est apte à maintenir une caractéristique de résistance haute tension, et dans lequel une fissure n'est pas facilement générée sur un vernis de fixation, même lorsque la température d'une bobine de stator augmente et qu'une haute tension est appliquée ; et une machine électrique rotative pourvue dudit stator. Pour un stator pour une machine électrique rotative comprenant une bobine 3 comportant un revêtement d'isolation ; et un noyau 1 pourvu d'une pluralité d'encoches 4 dans lequel la bobine est disposée, une résine composite dans laquelle une résine thermoplastique 52 est contenue dans une résine thermodurcissable 51 est utilisée pour le vernis de fixation d'encoche.
PCT/JP2015/072983 2014-09-05 2015-08-17 Stator pour machine électrique rotative et ladite machine WO2016035534A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-180739 2014-09-05
JP2014180739A JP2016059090A (ja) 2014-09-05 2014-09-05 回転電機のステータ、およびこれを備えた回転電機。

Publications (1)

Publication Number Publication Date
WO2016035534A1 true WO2016035534A1 (fr) 2016-03-10

Family

ID=55439600

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/072983 WO2016035534A1 (fr) 2014-09-05 2015-08-17 Stator pour machine électrique rotative et ladite machine

Country Status (2)

Country Link
JP (1) JP2016059090A (fr)
WO (1) WO2016035534A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7004491B2 (ja) * 2016-05-20 2022-01-21 デュポン帝人アドバンスドペーパー株式会社 金属板積層体及びその製造方法
JP7085845B2 (ja) * 2018-01-10 2022-06-17 日立Astemo株式会社 回転電機の固定子および回転電機

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5583435A (en) * 1978-12-20 1980-06-23 Hitachi Ltd Resin mold stator
JP2011154819A (ja) * 2010-01-26 2011-08-11 Hitachi Cable Ltd 絶縁電線
WO2014123122A1 (fr) * 2013-02-07 2014-08-14 古河電気工業株式会社 Fil électrique isolé et moteur

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5583435A (en) * 1978-12-20 1980-06-23 Hitachi Ltd Resin mold stator
JP2011154819A (ja) * 2010-01-26 2011-08-11 Hitachi Cable Ltd 絶縁電線
WO2014123122A1 (fr) * 2013-02-07 2014-08-14 古河電気工業株式会社 Fil électrique isolé et moteur

Also Published As

Publication number Publication date
JP2016059090A (ja) 2016-04-21

Similar Documents

Publication Publication Date Title
JP6738421B2 (ja) 回転電機及び回転電機の製造方法
EP2808981A2 (fr) Système d'isolation électrique
JP2007336650A (ja) 回転電機の固定子
WO2016035534A1 (fr) Stator pour machine électrique rotative et ladite machine
US20170033634A1 (en) Hydroelectrical machine coil insulation system and method
US10284042B2 (en) Two-layer high-voltage insulation system and electrical machine
EP2810358B1 (fr) Bobine de stator à haute tension dotée d'une pointe à puissance réduite
US10559992B2 (en) Stator of rotating electrical machine, and rotating electrical machine
US10670310B2 (en) Motor for use in refrigerant environment
EP1544985A2 (fr) Bobine pour machines électriques
DE102018125567A1 (de) Spule sowie stromerregte Synchronmaschine
WO2021145097A1 (fr) Bande de mica préimprégnée, machine dynamo-électrique et procédé de production de machine dynamo-électrique
JP6906329B2 (ja) 固定子、回転電機、固定子の製造方法、及び回転電機の製造方法
JP6522273B1 (ja) 固定子コイル、その製造方法及び回転電機
JP2021158908A (ja) プリプレグマイカテープ、回転電機及び回転電機の製造方法
JPH10210694A (ja) 回転電機の絶縁線輪
JP2019122183A (ja) 回転電機の固定子および回転電機
CN116998091A (zh) 定子及具有定子的旋转电机
JP7153437B2 (ja) 回転電機
JP2010177589A (ja) 車両用リアクトルおよびその製造方法
WO2013118528A1 (fr) Réacteur, convertisseur, dispositif de conversion de puissance et matériau de noyau pour réacteur
JP2015153967A (ja) リアクトル
JP2023092752A (ja) プリプレグマイカテープ、回転電機及び回転電機の製造方法
JP2009254028A (ja) 電磁コイル

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: 15838345

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15838345

Country of ref document: EP

Kind code of ref document: A1