STATOR CORE

• US 20170264147A1
• Filed: 03/14/2017
• Published: 09/14/2017
• Est. Priority Date: 03/14/2016
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: INOUE, Masashi
• Granted Patent: US 10,418,864 B2
• Time in Patent Office: Days
• CPC Class Codes: H02K 1/146 consisting of a generally annular yoke with salient poles
• CPC Class Codes: H02K 1/165 Shape, form or location of the slots
• CPC Class Codes: H02K 3/12 arranged in slots
• CPC Class Codes: H02K 3/18 Windings for salient poles

Abstract

A stator core of a rotating electric machine, includes a base, teeth, slots, and cutouts. The base includes a through-hole having a substantially cylindrical shape surrounded by an inner circumferential wall around a center axis of the substantially cylindrical shape. Teeth are arranged around the center axis and extending along a radial direction of the substantially cylindrical shape from the inner circumferential wall toward the center axis. Each of the teeth has a first end surface and a second end surface opposite to the first end surface in the center axis. Each of the slots is defined between a tooth and another tooth adjacent to the tooth among the teeth such that a coil is to be provided into each of the slots. Each of the cutouts is provided in the first end surface to face an inner surface of a bent portion of the coil.

Claims

1. A stator core comprising:

a cylindrical base portion; and

a plurality of teeth that extend inward in a radial direction from the cylindrical base portion and that are arranged at predetermined intervals in a circumferential direction,

wherein a slot, into which a coil is inserted, is formed between each pair of the teeth that are adjacent to each other in the circumferential direction, and

wherein a cutout is formed in a part of each of the teeth near one end surface of the tooth, the part facing an inner surface of a bent portion of the coil, the cutout having a predetermined length in the circumferential direction, a predetermined length in the radial direction, and a predetermined length in an axial direction.

2. The stator core according to claim 1,

wherein a gap is formed between the inner surface of the bent portion of the coil and the tooth, and the inner surface of the bent portion of the coil does not contact the tooth.

3. The stator core according to claim 1,

wherein the length of the cutout in the radial direction is greater than a length of the coil in the radial direction.

4. The stator core according to claim 1,

wherein the stator core includes a plurality of stator core plates that are stacked, and

wherein the cutout is formed by cutting some of the stator core plates that are located near the one end surface.

5. The stator core according to claim 1,

wherein a cutout is not formed in a part of each of the teeth near one end surface of the tooth, the part facing an outer surface of the bent portion of the coil, and

wherein a facing surface of the tooth, the facing surface facing the outer surface of the bent portion of the coil, extends in the axial direction.

6. The stator core according to claim 1,

wherein the cutout is formed in each of the pair of the teeth that are located adjacent to each other with the slot therebetween in the circumferential direction.

7. A stator core of a rotating electric machine, comprising:

a base including a through-hole having a substantially cylindrical shape surrounded by an inner circumferential wall around a center axis of the substantially cylindrical shape;

teeth arranged around the center axis and extending along a radial direction of the substantially cylindrical shape from the inner circumferential wall toward the center axis, each of the teeth having a first end surface and a second end surface opposite to the first end surface in the center axis;

slots each defined between a tooth and another tooth adjacent to the tooth among the teeth such that a coil is to be provided into each of the slots; and

cutouts each provided in the first end surface to face an inner surface of a bent portion of the coil.

8. The stator core according to claim 7, wherein the base has a cylindrical shape.

9. The stator core according to claim 8, wherein each of the cutouts has a predetermined length in a circumferential direction of the cylindrical chap of the base, a predetermined length in the radial direction, and a predetermined length in an axial direction of the center axis.

10. The stator core according to claim 7,

wherein a gap is formed between the inner surface of the bent portion of the coil and the tooth, and the inner surface of the bent portion of the coil does not contact the tooth.

11. The stator core according to claim 7,

wherein the length of the cutouts in the radial direction is greater than a length of the coil in the radial direction.

12. The stator core according to claim 7,

wherein the stator core includes a plurality of stator core plates that are stacked, and

wherein the cutouts are formed by cutting some of the stator core plates that are located near the first end surface.

13. The stator core according to claim 9,

wherein the cutouts are not formed in a part of each of the teeth near the first end surface of the tooth, the part facing an outer surface of the bent portion of the coil, and

wherein a facing surface of the tooth, the facing surface facing the outer surface of the bent portion of the coil, extends in the axial direction.

14. The stator core according to claim 9,

wherein the cutouts are formed in each of a pair of the teeth that are located adjacent to each other with the slots therebetween in the circumferential direction.