US-12627189-B2 - Stator, rotating electric machine, and method of manufacturing stator

Abstract

A stator ( 4 ) has a stator core having a plurality of tooth portions ( 7 ), a slot ( 8 ) provided between the tooth portions ( 7 ) and accommodating a coil ( 9 ), and the coil ( 9 ) accommodated in the slot ( 8 ), the stator has a resin layer ( 50 ) provided on an inner surface of the slot ( 8 ) and made of an insulating resin composition, a wall surface (a resin layer surface ( 55 ) of an inner resin layer ( 51 )) of the resin layer ( 50 ) on an inner side of the slot ( 8 ) is provided in parallel with a rotating shaft direction, the resin composition of the resin layer ( 50 ) contains a thermosetting resin, and the thermosetting resin has a glass transition temperature Tg of 120° C. or higher.

Inventors

• Atsunori Nishikawa
• Takahiro Harada
• Shinya Yamamoto
• Wataru Kosaka

Assignees

• SUMITOMO BAKELITE CO., LTD.

Dates

Publication Date

20260512

Application Date

20211208

Priority Date

20201209

Claims (10)

1. 1 . A stator comprising: a stator core having a plurality of tooth portions; a slot provided between the tooth portions and accommodating a coil; and the coil accommodated in the slot, wherein the stator has a resin layer provided on an inner surface of the slot and made of an insulating resin composition, wherein a wall surface of the resin layer on an inner side of the slot is provided in parallel with a rotating shaft direction, wherein the resin composition contains a thermosetting resin, wherein the thermosetting resin has a glass transition temperature Tg of 120° C. or higher, and wherein the resin layer has a thermal conductivity of 2 W/(m·K) or more.
2. 2 . The stator according to claim 1 , wherein the resin composition contains wax as a release agent.
3. 3 . The stator according to claim 1 , wherein the resin composition contains a filler as a filler material.
4. 4 . The stator according to claim 3 , wherein the resin composition has a filler content of 60% by volume or more with respect to a total amount of the resin composition.
5. 5 . The stator according to claim 1 , wherein the resin layer has a thickness of 50 μm or more and 500 μm or less.
6. 6 . The stator according to claim 1 , wherein the thermosetting resin is an epoxy resin.
7. 7 . The stator according to claim 1 , wherein the coil has a resin cover layer in which a coil surface is covered with a resin.
8. 8 . A stator comprising: a stator core having a plurality of tooth portions; a slot provided between the tooth portions and accommodating a coil; and the coil accommodated in the slot, wherein the stator has a resin layer provided on an inner surface of the slot and made of an insulating resin composition, wherein a wall surface of the resin layer on an inner side of the slot is provided in parallel with a rotating shaft direction, wherein the resin composition contains a thermosetting resin, wherein the thermosetting resin has a glass transition temperature Tg of 120° C. or higher, wherein the resin layer has a thermal conductivity of 0.5 W/(m·K) or more, wherein the stator has a resin liner member accommodating the coil, wherein the liner member is a separate member from the coil, and wherein the coil that is accommodated in the slot is in a state of being accommodated in the liner member.
9. 9 . A rotating electric machine comprising: the stator according to claim 1 .
10. 10 . A method of manufacturing a stator used for a rotating electric machine, having a stator core having a plurality of tooth portions, a slot provided between the tooth portions and accommodating a coil, and the coil accommodated in the slot, comprising: a resin layer forming step of forming a resin layer made of an insulating resin composition on an inner surface of the slot; and a coil placing step of placing the coil in the slot provided with the resin layer, wherein a wall surface of the resin layer on an inner side of the slot is provided in parallel with a rotating shaft direction of the rotating electric machine, wherein the resin composition contains a thermosetting resin, wherein the thermosetting resin has a glass transition temperature Tg of 120° C. or higher, and wherein the resin layer has a thermal conductivity of 2 W/(m·K) or more.

Description

TECHNICAL FIELD The present invention relates to a stator, a rotating electric machine, and a method of manufacturing the stator. BACKGROUND ART Regarding a rotating electric machine such as a motor (engine) or a generator, there has been known a technology for securing insulation between a slot and a coil by filling the slot with insulating paper or a resin material in a case where the coil is accommodated in the slot provided in a stator (for example, see Patent Document 1). Patent Document 1 discloses a technology for forming an insulating layer by injecting and curing a resin between a conductor (coil) and a peripheral wall portion of a slot. RELATED DOCUMENT Patent Document [Patent Document 1] Japanese Patent No. 6814568 SUMMARY OF THE INVENTION Technical Problem In improving the performance of a motor, there has been a requirement for a technology for: accurately placing a coil while properly maintaining insulation of the coil; and improving the space utilization efficiency of a slot, that is, increasing the ratio of the coil in the slot. The present invention is contrived in view of such circumstances, and an object of the present invention is to provide a technology capable of improving the space utilization efficiency of a slot. Solution to Problem According to the present invention, there is provided a stator having: a stator core having a plurality of tooth portions; a slot provided between the tooth portions and accommodating a coil; and the coil accommodated in the slot,in which the stator has a resin layer provided on an inner surface of the slot and made of an insulating resin composition,a wall surface of the resin layer on an inner side of the slot is provided in parallel with a rotating shaft direction,the resin composition contains a thermosetting resin, andthe thermosetting resin has a glass transition temperature Tg of 120° C. or higher. According to the present invention, there is provided a rotating electric machine having the above-described stator. According to the present invention, there is provided a method of manufacturing a stator used for a rotating electric machine, having a stator core having a plurality of tooth portions, a slot provided between the tooth portions and accommodating a coil, and the coil accommodated in the slot, having:a resin layer forming step of forming a resin layer made of an insulating resin composition on an inner surface of the slot; anda coil placing step of placing the coil in the slot provided with the resin layer,in which a wall surface of the resin layer on an inner side of the slot is provided in parallel with a rotating shaft direction of the rotating electric machine,the resin composition contains a thermosetting resin, andthe thermosetting resin has a glass transition temperature Tg of 120° C. or higher. Advantageous Effects of Invention According to the present invention, it is possible to provide a technology capable of improving the space utilization efficiency of a slot. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a motor according to a first embodiment in a direction perpendicular to a rotating shaft direction. FIG. 2 is a vertical cross-sectional view of the motor according to the first embodiment in the rotating shaft direction. FIG. 3 is an enlarged view showing the periphery of a slot according to the first embodiment. FIG. 4 is an enlarged view showing the periphery of the slot according to the first embodiment, in which a coil and a resin sealing portion in the slot are omitted from FIG. 3. FIG. 5 is a cross-sectional view of the periphery of the slot according to the first embodiment, taken along the line A-A in FIG. 3. FIG. 6 is a cross-sectional view of the periphery of the slot according to the first embodiment, taken along the line B-B in FIG. 4. FIG. 7 is a cross-sectional view of a motor according to a second embodiment in a direction perpendicular to a rotating shaft direction. FIG. 8 is a vertical cross-sectional view of the motor according to the second embodiment in the rotating shaft direction. FIG. 9 is an enlarged view showing the periphery of a slot according to the second embodiment. FIG. 10 is an enlarged view showing the periphery of a slot according to a third embodiment. FIGS. 11A to 11D are views showing four kinds of shapes of a liner member according to the third embodiment. FIG. 12 is a schematic view of a power module according to a fourth embodiment. FIGS. 13A and 13B are schematic views of a small-diameter resin pipe according to the fourth embodiment. FIG. 14 is a flowchart showing a method of manufacturing a small-diameter resin pipe according to the fourth embodiment. DESCRIPTION OF EMBODIMENTS First Embodiment <Outline> In this embodiment, an example of application to an electric motor (motor) as a rotating electric machine (electric motor, generator, or dual-use machine of electric motor/generator) will be described. FIG. 1 schematically shows a cross-sectional view of a mo