Stator core and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10763718-B2
Application number	US-201615561176-A
Country	US
Kind code	B2
Filing date	Apr 15, 2016
Priority date	Apr 16, 2015
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

In this stator core, the interval in the circumferential direction of the stator core between an outer peripheral surface of an axial end of a slot accommodated portion of a concentric coil and a tooth facing the outer peripheral surface is larger than the interval in the circumferential direction of the stator core between an inner peripheral surface of the axial end and a tooth facing the inner peripheral surface.

First claim

The invention claimed is:

1. A stator, comprising:
a stator core including a plurality of teeth and a plurality of slots each located between adjacent ones of the teeth; and
a concentric coil formed by concentrically winding a rectangular wire and placed in the slots of the stator core, wherein
an interval in a circumferential direction of the stator core between an outer peripheral surface of an axial end of a slot accommodated portion of the concentric coil about a winding center of the concentric coil and the tooth facing the outer peripheral surface is larger than an interval in the circumferential direction of the stator core between an inner peripheral surface of the axial end of the slot accommodated portion of the concentric coil about the winding center of the concentric coil and the tooth facing the inner peripheral surface,
an interval in the circumferential direction between the concentric coil and the tooth facing an outer peripheral surface of the concentric coil decreases from an axial end of the slot toward an axial middle portion of the slot,
the interval in the circumferential direction between the concentric coil and the tooth facing the outer peripheral surface of the concentric coil gradually decreases from the axial end of the slot toward the axial middle portion of the slot, and then increases toward a vicinity of the axial middle portion of the slot.

2. The stator according to claim 1 , wherein
the interval in the circumferential direction between each of the axial ends of the concentric coil which are located at both ends on one side and the other side in an axial direction of the slot and the tooth facing the outer peripheral surface of the axial end is larger than the interval in the circumferential direction between each of the axial ends and the tooth facing the inner peripheral surface of the axial end.

3. The stator according to claim 2 , wherein
the teeth includes a first tooth and a second tooth which are located adjacent to each other,
the concentric coil includes a first concentric coil and a second concentric coil which are placed in the same slot located between the first and second teeth located adjacent to each other, and the outer peripheral surface of the axial end of the slot accommodated portion of the first concentric coil about the winding center of the concentric coil faces the first tooth and the outer peripheral surface of the axial end of the slot accommodated portion of the second concentric coil about the winding center of the concentric coil faces the second tooth,
an interval in the circumferential direction between a first axial end of the first concentric coil and the first tooth facing an outer peripheral surface of the first axial end of the first concentric coil is larger than an interval in the circumferential direction between the first axial end of the first concentric coil and the second tooth facing an inner peripheral surface of the first axial end, and
an interval in the circumferential direction between a second axial end of the second concentric coil and the second tooth facing an outer peripheral surface of the second axial end of the second concentric coil is larger than an interval in the circumferential direction between the second axial end of the second concentric coil and the first tooth facing an inner peripheral surface of the second axial end.

4. The stator according to claim 3 , wherein
in the same slot where the first concentric coil and the second concentric coil are placed, turns of a rectangular wire of the first concentric coil and turns of a rectangular wire of the second concentric coil are alternately arranged at intervals in a radial direction.

5. The stator according to claim 4 , further comprising:
an insulating member placed between the slot and the concentric coil, wherein
the inner peripheral surface of the axial end is in contact with the insulating member, and
the axial end and the tooth facing the inner peripheral surface of the axial end are separated by an interval in the circumferential direction which corresponds to a thickness of the insulating member.

6. The stator according to claim 5 , further comprising:
a fixing agent that fills between the axial end of the slot accommodated portion and the tooth facing the outer peripheral surface of the axial end and between the axial end of the slot accommodated portion and the tooth facing the inner peripheral surface of the axial end.

7. The stator according to claim 6 , wherein
the fixing agent includes varnish.

8. The stator according to claim 1 , wherein
the teeth includes a first tooth and a second tooth which are located adjacent to each other,
the concentric coil includes a first concentric coil and a second concentric coil which are placed in the same slot located between the first and second teeth located adjacent to each other, and the outer peripheral surface of the axial end of the slot accommodated portion of the first concentric coil about the winding center of the concentric coil faces the first tooth and the outer peripheral surface of the axial end of the slot accommodated portion of the second concentric coil about the winding center of the concentric coil faces the second tooth,
an interval in the circumferential direction between a first axial end of the first concentric coil and the first tooth facing an outer peripheral surface of the first axial end of the first concentric coil is larger than an interval in the circumferential direction between the first axial end of the first concentric coil and the second tooth facing an inner peripheral surface of the first axial end, and
an interval in the circumferential direction between a second axial end of the second concentric coil and the second tooth facing an outer peripheral surface of the second axial end of the second concentric coil is larger than an interval in the circumferential direction between the second axial end of the second concentric coil and the first tooth facing an inner peripheral surface of the second axial end.

9. The stator according to claim 8 , wherein
in the same slot where the first concentric coil and the second concentric coil are placed, turns of a rectangular wire of the first concentric coil and turns of a rectangular wire of the second concentric coil are alternately arranged at intervals in a radial direction.

10. The stator according to claim 1 , further comprising:
an insulating member placed between the slot and the concentric coil, wherein
the inner peripheral surface of the axial end is in contact with the insulating member, and
the axial end and the tooth facing the inner peripheral surface of the axial end are separated by an interval in the circumferential direction which corresponds to a thickness of the insulating member.

11. The stator according to claim 1 , further comprising:
a fixing agent that fills between the axial end of the slot accommodated portion and the tooth facing the outer peripheral surface of the axial end and between the axial end of the slot accommodated portion and the tooth facing the inner peripheral surface of the axial end.

12. A stator, comprising:
a stator core including a plurality of teeth and a plurality of slots each located between adjacent ones of the teeth; d
a concentric coil formed by concentrically winding a rectangular wire and placed in the slots of the stator core, wherein
an interval in a circumferential direction of the stator core between an outer peripheral surface of an axial end of a slot accommodated portion of the concentric coil about a winding center of the concentric coil and the tooth facing the outer peripheral surface is larger than an inte

Assignees

• Aisin Aw Co
• Sisin Aw Co Ltd

Inventors

• Koga Kiyotaka
• Hashimoto Shingo
• Sato Shingo

Classifications

• H02K15/22

  Shaping or compacting conductors in slots or around salient poles (H02K15/28 takes precedence) · CPC title

• H02K15/12

  Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines · CPC title

• H02K3/12

  arranged in slots · CPC title

• H02K3/48 Primary

  in slots · CPC title

• H02K15/085

  by laying conductors into slotted stators · CPC title