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WO2008130058A1 - Stator, son procédé de fabrication, et moteur - Google Patents

Stator, son procédé de fabrication, et moteur Download PDF

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Publication number
WO2008130058A1
WO2008130058A1 PCT/JP2008/058001 JP2008058001W WO2008130058A1 WO 2008130058 A1 WO2008130058 A1 WO 2008130058A1 JP 2008058001 W JP2008058001 W JP 2008058001W WO 2008130058 A1 WO2008130058 A1 WO 2008130058A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
self
insulating paper
stator
slot
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/JP2008/058001
Other languages
English (en)
Japanese (ja)
Inventor
Shigeto Takeuchi
Tomotsugu Taira
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Publication of WO2008130058A1 publication Critical patent/WO2008130058A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines

Definitions

  • the present invention relates to a stator, a manufacturing method thereof, and a motor, and more particularly, to a stator capable of preventing electric field concentration due to an air gap between insulating paper and a coil and preventing insulation from being deteriorated, and a manufacturing method thereof.
  • the present invention relates to a motor including the stator.
  • a stator constituting a motor is formed by laminating a steel plate including an annular yoke, a plurality of teeth projecting radially inward from the yoke, and a slot formed between adjacent teeth.
  • a stator is formed from a stator core, and a stator is manufactured by fitting between teeth while a coil is inserted into the slot.
  • Concentrated winding method is a form in which a coil is mounted for each tooth, and distributed winding method spans multiple teeth. The coil is wound.
  • the protruding length of the coil end from the end of the stator core can be relatively shortened, and therefore the motor can be downsized.
  • the space factor which is the ratio of the coil cross section to the slot cross section, can be easily increased, and the production efficiency is also high.
  • the reluctance torque is relatively large, and furthermore, the amount of heat generated when the rotor is driven is small, so that the output performance of the motor (rotor performance and torque performance of the rotor) increases. .
  • slot insulation paper is interposed between the slot wall surface and the coil from the viewpoint of ensuring insulation between the slot wall surface and the coil end.
  • Interphase insulation paper is provided for insulation between different phase coils. After the insulation paper and coil are formed, coil the varnish from the coil end.
  • WO 2008/130058 It is impregnated in the coil, and the insulation between the stator core and the coil and between the different phase coils is ensured by curing the varnish.
  • the impregnation of the varnish has not only the sealing of the coil but also the purpose of ensuring insulation and promoting the heat radiation from the coil by filling the gap between the coils with the varnish.
  • FIGS. Fig. 10 shows the air gap A between the U-phase coil Q 1 and the V-phase coil Q 2 and the interphase insulating paper P 1 interposed between them at the coil end of the distributed stator. Explains the situation that is occurring.
  • each coil is impregnated with varnish W
  • each coil Q l, Q 2 and interphase insulating paper P 1 are not impregnated with varnish W, resulting in an air gap A.
  • Fig. 11 is common to both concentrated and distributed stators, and the air gap between slot insulation paper P2 and coil Q installed in slot R Explains the situation where A occurs. Even in slot R, varnish W is impregnated between the coils, but varnish becomes difficult to impregnate between the slot wall surface and coil Q as the coil space factor increases. It tends to occur.
  • the varnish is not sufficiently impregnated, it will not be possible to sufficiently obtain the effects of ensuring insulation and promoting heat dissipation as described above, and electric field concentration will occur in the air gap where the varnish is not impregnated. The part where insulation is severe will occur. Furthermore, the heat release performance of the air gap is significantly reduced as compared with the varnish-impregnated portion.
  • Patent Document 1 discloses a technique related to an electric wire for a coil of an electric motor. Specifically, an insulating coating made of polyester is formed on the surface of a conductor, and further, an inorganic filler is contained on the outside thereof. A fused film is formed. With this fusion coating, the heat dissipation of the electric wire can be improved.
  • the present invention has been made in view of the above-described problems, and it is possible to effectively generate an air gap between the coil and the stator core without lowering the coil space factor at an inexpensive manufacturing cost. It is an object of the present invention to provide a stator that can be eliminated, a method of manufacturing the stator, and a motor including the stator.
  • a stator according to the present invention includes an annular yoke, a plurality of teeth projecting radially inward from the yoke, and a slot formed between adjacent teeth.
  • a stator insulating paper having a self-bonding layer on at least one side surface between the coil and the teeth. The self-bonding layer is welded to the coil.
  • slot insulating paper is disposed in the slot, and this slot insulating paper is of a concentrated type that ensures insulation between the coil made of the conductor and the slot wall surface of the stator core. Intended for the stator.
  • the slot insulating paper used is, for example, a high heat-resistant resin material on at least one side surface of a polymer paper sheet having insulating performance such as polyethylene telenaphthalate (PET) or polyethylene naphthalate (PEN).
  • a polymer paper sheet having insulating performance such as polyethylene telenaphthalate (PET) or polyethylene naphthalate (PEN).
  • PET polyethylene telenaphthalate
  • PEN polyethylene naphthalate
  • An insulating paper having a self-bonding layer made of is used.
  • the self-bonding layer can be formed from a polyamide resin such as nylon 6, nylon 6-6, nylon 6 or 10, for example.
  • the varnish is impregnated in the coil after the coil is formed, but the self-bonding layer is heated and melted to be generated between the coil conductor and the slot insulating paper.
  • the self-bonding layer melted in the air gearup portion where the varnish is not impregnated is impregnated by the surface tension, and the air gap portion is filled.
  • the fused layer is solidified, and a stator without an air gap can be manufactured between the coil and the insulating paper.
  • the configuration in which the self-bonding layer is provided on the insulating paper does not reduce the coil space factor, and moreover, the manufacturing cost compared to the case where the self-bonding layer is formed on the conductive wire. Will be much cheaper.
  • the coil is a distributed multiphase coil, and between the U phase coil and the V phase coil and between the V phase coil and the w phase coil in the coil end.
  • interphase insulating papers each having a self-bonding layer on both sides are interposed, and the self-bonding layer is bonded to the coil.
  • the stator of the present invention is intended for a distributed type stator having a U-phase coil, a V-phase coil, and a W-phase coil.
  • this distributed type stator in addition to the slot insulating paper, Interphase insulating paper is installed to insulate between the different phase coils at the coil end.
  • the interphase insulating paper interposed between the U-phase coil and the V-phase coil and between the V-phase coil and the W-phase coil the interphase insulating paper provided with self-bonding layers on both sides of the above-mentioned polymer material is used. use.
  • the self-bonding layer of the interphase insulating paper can also be formed from the above-mentioned high heat-resistant resin material, and the air gap generated between each phase coil and the interphase insulating paper is filled with the self-bonding layer by heat treatment. be able to.
  • a motor having the above-described concentrated-winding type stator or distributed-winding type stator, a motor having high heat dissipation and high insulation safety can be obtained.
  • This insulation safety means that the occurrence of electric field concentration can be eliminated to prevent the occurrence of severely insulating parts, resulting in a low probability of motor dielectric breakdown.
  • Such high-performance motors have a wide range of applications, including not only application to next-generation SR motors for hybrid vehicles, but also motors used in various home appliances and model playground equipment.
  • the stator manufacturing method is a stator manufacturing method in which a coil is concentratedly wound, and includes a step of preparing slot insulating paper having a self-bonding layer on at least one side surface, and a stator core.
  • a step of manufacturing a step of disposing the slot insulating paper in the spout in a posture in which the self-bonding layer is directed to the side opposite to the wall surface of the spout, and a coil around each tooth.
  • the varnish is impregnated from the coil end after the coil is formed, and then the heat treatment is performed.
  • the heat treatment is performed prior to the varnish impregnation, the self-bonding layer is melted.
  • a method of melting the self-bonding layer in the heat treatment step after varnish impregnation may be used.
  • this heat treatment may be any method of current heating and furnace heating, and is preferably performed in a temperature atmosphere that is higher than the melting point of the self-bonding layer and does not cause thermal deterioration of the stator core.
  • a stator manufacturing method is a stator manufacturing method in which coils are distributedly wound, and includes slot insulating paper having a self-bonding layer on at least one side surface, and a self-bonding layer on both sides.
  • the coil end is laced and then varnish-impregnated, and the heating process is performed prior to this lacing to melt the self-bonding layer.
  • heat treatment after varnish impregnation treatment A method of melting the self-bonding layer in stages may be used.
  • the air gap between the coil and the insulating paper can be reduced at low cost without reducing the coil space factor. It is possible to eliminate the occurrence, and to obtain a stator and a motor excellent in heat dissipation and insulation.
  • FIG. 1 is a perspective view of an embodiment of the slot insulating paper of the present invention.
  • FIG. 2 is a perspective view of an embodiment of the interphase insulating paper of the present invention.
  • FIG. 3 (a) is a cross-sectional view showing the situation before the self-bonding layer of the slot insulation paper is melted, and (b) is the situation where the self-fusion layer of the slot insulation paper is melting.
  • FIG. 4 is a perspective view of the distributed winding stator of the present invention.
  • FIG. 5 is an enlarged view of a portion V in FIG.
  • FIG. 6 is a cross-sectional view of the inside of the coil end of FIG.
  • FIG. 7 is an enlarged view of a part VII in FIG.
  • FIG. 8 is a sectional view of the inside of the slot of FIG.
  • Figure 9 is a schematic diagram of a simulation analysis result image regarding the presence or absence of electric field concentration.
  • (A) is the result for a case using conventional insulating paper
  • (b) is the result of using the insulating paper of the present invention. It is the result regarding the case.
  • FIG. 10 is a cross-sectional view showing a U-phase coil and a V-phase coil in a conventional coiled end of a distributed stator and interphase insulating paper interposed therebetween.
  • FIG. 11 is a cross-sectional view showing a slot wall surface and slot insulating paper in a conventional spout of a stator.
  • 1 is a piece of paper
  • 2 is a self-bonding layer
  • 3 A, 3 B are conductors
  • 3 1 is a conductor
  • 3 2 is an enamel coating
  • 4 is a stator core
  • 4 1 is a tooth
  • 4 2 is a slot
  • 4 3 is coiled
  • 5 is varnish
  • 10 slot insulating paper
  • 20 interphase insulating paper
  • 1 0 0 is distributed stator.
  • FIG. 1 is a perspective view of an embodiment of the slot insulating paper of the present invention
  • FIG. 2 is a perspective view of an embodiment of the interphase insulating paper of the present invention
  • Fig. 3a is a cross-sectional view showing the situation before the self-bonding layer of the slot insulating paper is melted
  • Fig. 3b is a cross-section showing the state of the self-bonding layer of the slot insulating paper being melted.
  • FIG. 4 is a perspective view of a distributed-spreading stator according to the present invention
  • FIG. 5 is an enlarged view of a portion V in FIG. 4, and FIG.
  • FIG. 6 is a cross-sectional view inside the coil end of FIG. 7 is an enlarged view of the VII portion of FIG. 4, and FIG. 8 is a cross-sectional view of the inside of the slot of FIG.
  • Fig. 9 is a diagram simulating the simulation analysis result image regarding the presence or absence of electric field concentration
  • Fig. 9 a is the result for the case using conventional insulating paper
  • Fig. 9 b is the case using the insulating paper of the present invention. Is the result.
  • the shape of the insulating paper is not limited to the embodiment shown in the drawing, and any insulating paper having a self-bonding layer on at least one side and both sides of the paper may be used. The shape is arbitrary.
  • FIG. 1 shows an embodiment of slot insulation paper.
  • This slot insulating paper 10 is made of a paper piece 1 of a polymer material having an insulating performance such as polyethylene naphthalate (PET) or polyethylene naphthalate (PEN), and on one side, nylon 6, nylon A self-bonding layer 2 made of a highly heat-resistant resin material such as polyamide resin such as 6-6 and nylon 6-10 is fixed and formed.
  • PET polyethylene naphthalate
  • PEN polyethylene naphthalate
  • nylon 6 nylon A self-bonding layer 2 made of a highly heat-resistant resin material such as polyamide resin such as 6-6 and nylon 6-10 is fixed and formed.
  • the slot insulating paper 10 is arranged in a posture in which the self-bonding layer 2 is directed to the side opposite to the slot wall surface (coil side) in a stator slot (not shown).
  • FIG. 2 shows an embodiment of interphase insulating paper.
  • This interphase insulating paper 20 is a paper piece 1 made of the same material as the slot insulating paper 10 and self-bonding layers 2 and 2 of the above material fixed to both sides thereof. It is inserted between the phase coil and the V-phase coil and between the V-phase coil and the W-phase coil.
  • Fig. 3 shows that when slot insulating paper 10 is placed in a high-temperature atmosphere, its self-bonding layer 2 melts and coil 3 (consists of copper conductor 3 1 and enamel coating 3 2 on its periphery). ) And slot insulating paper 10 are simulated.
  • Fig. 3a shows the situation before melting of the self-bonding layer 2
  • Fig. 3b shows the self-bonding layer. 2 shows a melting state (the self-bonding layer 2 melts in the direction of the arrow in Fig. 3b).
  • the self-bonding layer 2 that has melted and the viscosity has been reduced penetrates between the paper piece 1 and the coil with surface tension, and the slot insulating paper 10 is disposed across the height of the stator core. Therefore, the possibility of unimpregnated parts of the melted self-bonding layer 2 is extremely low.
  • the melting of the self-bonding layer 2, that is, the heat treatment step may be performed before or after the varnish impregnation treatment step.
  • Fig. 4 shows that the slot insulating paper 10 is placed in the slot, and the interphase insulating paper 20 is between the U-phase coil and V-phase coil of coil end 4 3 and between the V-phase coil and W-phase coil.
  • a distributed stator 100 is shown in which each self-bonding layer 2 is bonded to the coil through heat treatment.
  • FIG. 5 is an enlarged view of the coil end
  • FIG. 6 is an enlarged sectional view of the inside.
  • the air gap A generated in FIG. 10 is impregnated with the melted self-bonding layer 2 of the interphase insulating paper 20, so that the U-phase coil 3 A and There is no air gap between V-phase coil 3 B and paper piece 1.
  • varnish 5 is impregnated between the conducting wires 3 A,..., 3 B,. Therefore, there is no air gap between the coils and between the coil and the insulating paper, and a stator with high interphase insulation is formed.
  • FIG. 7 is an enlarged view of the inside of the slot
  • FIG. 8 is an enlarged sectional view of the inside thereof.
  • the air gap A generated in FIG. 11 is impregnated with the melted self-bonding layer 2 of the slot insulating paper 10, and as shown in FIG. There is no air gap between and the piece of paper 1.
  • the varnish 5 is impregnated between the conductors 3 and 3 in the same manner as the coil end, so that high insulation between the stator core and the coil is ensured.
  • the present inventors simulated whether or not there is electric field concentration between the case where the insulating paper (the paper piece) and the coil conductor are fused using the insulating paper of the present invention and the case where the conventional insulating paper is used. Analyzed. An image showing the analysis results is simulated in Fig. 9, where Fig. 9a shows the case of using conventional insulating paper, and Fig. 9b shows the case of using the insulating paper of the present invention having a self-bonding layer. Shows the case.
  • Ml is a conventional insulating paper model without a self-bonding layer
  • coil models M2 and M3 are arranged on both sides of the insulating paper model M1 with a gap (air gap).
  • the potential difference is 650 V
  • the conductor diameter is 0.85 mm
  • the enamel width is 0.035 mm
  • the insulating paper thickness is 0.125 mm
  • the relative permittivity is self-bonding layer. 3 for air, 1 for coil, 0 for coil, and 4 for enamel and insulating paper.
  • the electric field distribution is 7 to 9.5 X 10 6 (V / m) in the air gap region (V l, V2 region). As the distance from the V3 region, V 4 region and the air gap increases. The voltage goes down. In other words, it can be identified that electric field concentration occurs in this air gap.
  • the electric field distribution in the region where the air gap occurred in Fig. 9a (V 3 region in Fig. 9 b) is 5 X 10 6 (V / m), and the outer V 4 region
  • the electric field level is about the same as the electric field distribution (3 X 10 6 (V / m)). From this analysis result, it is possible to specify that the electric field concentration does not occur when the paper piece and the coil are fused in the self-bonding layer and there is no air gap. Note that the electric field levels in the 3 and V4 regions in Fig. 9 & are the same as those in Fig. 9b.
  • the motor having the stator 100 is particularly suitable for a drive motor for a hybrid vehicle or an electric vehicle that requires high durability and high output performance.

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

Abstract

La présente invention porte sur un stator qui peut éliminer de manière effective la création d'un espace d'air entre une bobine et un noyau de stator sans abaisser le rapport volumique occupé par la bobine. L'invention porte également sur un procédé de fabrication du stator et sur un moteur. Entre la bobine (3) et des dents est agencée une feuille de papier d'isolation de fente (10) ayant une couche autofusible (2) au moins sur une de ses surfaces, la couche autofusible (2) étant orientée vers la bobine. La couche autofusible (2) est fondue sur la bobine (3) de manière à constituer un stator. Lorsque le stator est un stator à enroulement réparti, une feuille de papier d'isolation entre phases (20) ayant la couche autofusible (2, 2) sur ses deux surfaces est agencée entre des bobines de phases différentes et les couches autofusibles (2, 2) sont fondues sur les bobines.
PCT/JP2008/058001 2007-04-18 2008-04-18 Stator, son procédé de fabrication, et moteur Ceased WO2008130058A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007108847A JP2008271661A (ja) 2007-04-18 2007-04-18 ステータおよびその製造方法とモータ
JP2007-108847 2007-04-18

Publications (1)

Publication Number Publication Date
WO2008130058A1 true WO2008130058A1 (fr) 2008-10-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/058001 Ceased WO2008130058A1 (fr) 2007-04-18 2008-04-18 Stator, son procédé de fabrication, et moteur

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JP (1) JP2008271661A (fr)
WO (1) WO2008130058A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5284847B2 (ja) * 2009-03-30 2013-09-11 本田技研工業株式会社 電動機用ステータ又はロータの製造方法
JP2012139069A (ja) * 2010-12-27 2012-07-19 Mitsubishi Electric Corp 密閉型圧縮機
JP7543156B2 (ja) 2021-02-08 2024-09-02 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
JPH0568359A (ja) * 1991-09-10 1993-03-19 Fuji Electric Co Ltd 低電圧回転機の固定子巻線
JPH11178264A (ja) * 1997-12-10 1999-07-02 Fuji Electric Co Ltd 低圧電気機械用の電機子巻線

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0568359A (ja) * 1991-09-10 1993-03-19 Fuji Electric Co Ltd 低電圧回転機の固定子巻線
JPH11178264A (ja) * 1997-12-10 1999-07-02 Fuji Electric Co Ltd 低圧電気機械用の電機子巻線

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