Stator, stator assembly, and transducer for converting between electrical energy and mechanical energy

Patent metadata

Field	Value
Publication number	US-11329526-B2
Application number	US-202016801589-A
Country	US
Kind code	B2
Filing date	Feb 26, 2020
Priority date	Feb 28, 2019
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A stator member may include a columnar stator core, a linear coil, and an insulating insulator. The linear coil may be wound around the stator core. The insulator may be disposed between the stator core and the coil. Furthermore, the insulator may include a central member and an outer member. The central member may cover the stator core. The outer member may be connected to an outside of the central member in an axial direction of the stator core. The outer member may include a surface extending in a thickness direction in which the central member and the outer member are arranged, and a groove recessed in a direction orthogonal to the thickness direction from the surface. A connection terminal of a busbar member may be inserted into the groove.

First claim

What is claimed is:

1. A stator comprising:
a stator core configured to have a shape extending along an axial direction and having a side surface extending in the axial direction;
an insulator disposed on the side surface of the stator core; and
a coil having a linear shape and wound around the side surface of the stator core with the insulator interposed therebetween,
wherein the insulator comprises a central member that surrounds the stator core and an outer member that is connected to the central member in the axial direction of the stator core,
wherein the outer member comprises a wall surface substantially parallel to a direction in which the central member and the outer member are arranged, and
wherein a groove is recessed in a direction orthogonal to the wall surface and configured to be traversed by a portion of the coil.

2. The stator according to claim 1 , wherein
the outer member further comprises a first wall forming a wall of the groove on an outer side of the stator, and a second wall forming a wall of the groove on an inner side of the stator.

3. The stator according to claim 2 , wherein the first wall is lower in height than the second wall.

4. The stator according to claim 3 , wherein the second wall comprises a first recess having a shape extending in a thickness direction, and wherein an end of the coil is configured to be inserted into the first recess.

5. The stator according to claim 4 , wherein the first wall comprises a second recess having a shape extending in a thickness direction, and wherein the end of the coil is configured to be inserted into the second recess after the first recess.

6. The stator according to claim 5 , wherein the shape of the first recess and the shape of the second recess comprise different shapes.

7. The stator according to claim 6 , wherein a depth of the first recess is larger than the depth of the second recess.

8. The stator according to claim 7 , wherein a depth of the groove is larger than the first recess.

9. A transducer for converting between electrical energy and mechanical energy, comprising:
a stator core configured to have a shape extending along an axial direction and having a side surface extending in the axial direction;
an insulator disposed on the side surface of the stator core; and
a coil having a linear shape and wound around the side surface of the stator core with the insulator interposed therebetween,
wherein the insulator comprises a central member and an outer member, and the outer member connected to the central member in the axial direction of the stator core,
wherein the outer member comprises a wall surface substantially parallel to a direction in which the central member and the outer member are arranged, and
a groove recessed in a direction orthogonal to the wall surface;
a rotor member disposed in a central opening of a stator assembly, and having an axis orthogonal to an opening surface; and
a busbar connected to the coil of the stator assembly, wherein
the busbar comprises a base portion in an annular shape, and
a connection terminal in a plate shape connected to the base portion and connected to the coil, and
wherein connection terminal is configured to be fitted into the groove together with an end of the coil.

10. The transducer according to claim 9 , wherein the connection terminal includes
a main part in a plate shape, and
a tongue portion extending from an end in a width direction of the main part and configured to be compressed with the end of the coil together with the main part.

11. A stator assembly, comprising:
a first stator and a second stator adjacent to each other in an annular shape, and each of the first stator and the second stator comprising:
a stator core having a shape extending along an axial direction, and having a side surface extending in the axial direction;
a stator core configured to have a shape extending along an axial direction and having a side surface extending in the axial direction;

an insulator disposed on the side surface of the stator core; and
a coil having a linear shape and wound around the side surface of the stator core with the insulator interposed therebetween,
wherein the insulator comprises a central member and an outer member, and the outer member connected to the central member in the axial direction of the stator core,
wherein the outer member comprises a wall surface substantially parallel to a direction in which the central member and the outer member are arranged, and
a groove recessed in a direction orthogonal to the wall surface,
wherein the groove is formed by an opening on a first side surface and a second side surface of the outer member,
the opening of the groove on the first side surface of the first stator, and an opening of the groove on the second side surface of the second stator are opposed to each other.

12. The stator assembly according to claim 11 , wherein the outer member further comprises a first wall forming a wall of the groove on an outer side of the first stator and the second stator, and a second wall forming a wall of the groove on an inner side of each of the first stator and the second stator.

13. The stator assembly according to claim 12 , wherein the first wall is lower in height than the second wall.

14. The stator assembly according to claim 13 , wherein the second wall comprises a first recess having a shape extending in a thickness direction, and wherein an end of the coil is configured to be inserted into the first recess.

15. The stator assembly according to claim 14 , herein the first wall comprises a second recess having a shape extending in a thickness direction, and wherein the end of the coil is configured to be inserted into the second recess after the first recess.

16. The stator assembly according to claim 15 , wherein the shape of the first recess and the shape of the second recess comprise different shapes.

17. The stator assembly according to claim 16 , wherein a depth of the first recess is larger than the depth of the second recess.

18. The stator assembly according to claim 17 , wherein a depth of the groove is larger than the first recess.

Assignees

• Murata Manufacturing Co

Inventors

• Natsumeda Mitsutoshi
• Sakaguchi Eiji
• Amano Hisato
• Sakurada Takashi

Classifications

• H02K3/50

  Fastening of winding heads, equalising connectors, or connections thereto · CPC title

• H02K3/38

  around winding heads, equalising connectors, or connections thereto · CPC title

• H02K3/522 Primary

  for generally annular cores with salient poles · CPC title

• H02K3/28 Primary

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title

• H02K2203/09

  Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations · CPC title