Stator and motor having coil units annularly arranged

Patent metadata

Field	Value
Publication number	US-12294270-B2
Application number	US-202217994037-A
Country	US
Kind code	B2
Filing date	Nov 25, 2022
Priority date	May 26, 2020
Publication date	May 6, 2025
Grant date	May 6, 2025

Abstract

A device may include a coil unit assembly that includes a first, second, and third coil unit annularly arranged. Further, may include a busbar provided on an outer peripheral surface of the coil unit assembly, wherein when a direction in which an axis of the stator extends is defined as an axial direction, a direction which is orthogonal to the axial direction and in which outer peripheral surface and inner peripheral surface of the stator face each other is a radial direction, and a direction along an outer periphery of the stator when viewed from the axial direction is a circumferential direction, wherein the coil units each include a split core that includes a tooth that extends in the radial direction, an insulator mounted to overlap at least the tooth of the split core, and a coil that includes a winding wound around the tooth of the split core with the insulator interposed therebetween.

First claim

The invention claimed is:

1. A stator comprising:
a coil unit assembly that includes coil units annularly arranged; and
a busbar provided on an outer peripheral surface of the coil unit assembly,
wherein when a direction in which an axis of the stator extends is defined as an axial direction, a direction which is orthogonal to the axial direction and in which outer peripheral surface and inner peripheral surface of the stator face each other is a radial direction, and a direction along an outer periphery of the stator when viewed from the axial direction is a circumferential direction,
wherein the coil units each include a split core that includes a tooth that extends in the radial direction, an insulator mounted to overlap at least the tooth of the split core, and a coil that includes a winding wound around the tooth of the split core with the insulator interposed therebetween, and
wherein the coil units include a first coil unit, a second coil unit, and a third coil unit annularly and repeatedly arranged in sequence along the circumferential direction.

2. The stator according to claim 1 , wherein the first coil unit includes a first split core, a first insulator, and a first coil that includes a U-phase winding, the second coil unit includes a second split core, a second insulator, and a second coil that includes a V-phase winding, and the third coil unit includes a third split core, a third insulator, and a third coil that includes a W-phase winding.

3. The stator according to claim 2 , further comprising an outer end surface on an opposite side of the tooth in the radial direction of each of the first insulator, the second insulator, and the third insulator is exposed on the outer peripheral surface of the coil unit assembly.

4. The stator according to claim 3 , wherein the outer end surface of each of the first insulator, the second insulator, and the third insulator is provided with a first groove, a second groove, and a third groove that extend in the circumferential direction over the first insulator, the second insulator, and the third insulator and are different from each other in position in the axial direction.

5. The stator according to claim 4 , wherein:
the U-phase winding has a first end portion drawn toward one end in the circumferential direction of the first groove of the first insulator and a second end portion drawn toward one end in the circumferential direction of the second groove of the first insulator,
the V-phase winding has a first end portion drawn toward one end in the circumferential direction of the second groove of the second insulator and a second end portion drawn toward one end in the circumferential direction of the third groove of the second insulator, and
the W-phase winding has a first end portion drawn toward one end in the circumferential direction of the third groove of the third insulator and a second end portion drawn toward one end in the circumferential direction of the first groove of the third insulator.

6. The stator according to claim 5 , wherein the busbar includes a first busbar provided in the first groove, a second busbar provided in the second groove, and a third busbar provided in the third groove.

7. The stator according to claim 6 , wherein:
the second end portion of the W-phase winding and the first end portion of the U-phase winding are adjacent to each other in the circumferential direction and electrically connected to each other by the first busbar,
the second end portion of the U-phase winding and the first end portion of the V-phase winding are adjacent to each other in the circumferential direction and electrically connected to each other by the second busbar,
the second end portion of the V-phase winding and the first end portion of the W-phase winding are adjacent to each other in the circumferential direction and electrically connected to each other by the third busbar, and
the U-phase winding, the V-phase winding, and the W-phase winding form a delta connection with parallel circuits in respective phases.

8. The stator according to claim 7 , wherein the busbar has a pair of bent portions adjacent to each other in the circumferential direction, and
end portions of two of the windings adjacent to each other in the circumferential direction are sandwiched by the pair of bent portions in the circumferential direction.

9. The stator according to claim 7 , wherein an end portion of the winding is connected to a terminal provided to the insulator and electrically connected to the busbar with the terminal interposed therebetween.

10. The stator according to claim 7 , wherein the insulator is provided with circumferential positioning means for performing positioning in the circumferential direction of an end portion of the winding.

11. The stator according to claim 7 , wherein the insulator is provided with axial positioning means for performing positioning in the axial direction of an end portion of the winding.

12. The stator according to claim 7 , wherein in the radial direction, an outer end, located on an opposite side of an inner peripheral surface of the coil unit assembly, of the busbar is located closer to the inner peripheral surface of the coil unit assembly than an outer end of the outer peripheral surface of the coil unit assembly is.

13. The stator according to claim 1 , wherein the busbar is annular when viewed from the axial direction.

14. The stator according to claim 1 , wherein the busbar is formed into an annular shape with which both ends of a single conductor are brought into contact.

15. The stator according to claim 1 , wherein the busbar contains copper.

16. The stator according to claim 1 , wherein the busbar includes a conductive spring material.

17. A motor comprising:
a stator comprising:
a coil unit assembly that includes coil units annularly arranged; and
a busbar provided on an outer peripheral surface of the coil unit assembly,
wherein when a direction in which an axis of the stator extends is defined as an axial direction, a direction which is orthogonal to the axial direction and in which outer peripheral surface and inner peripheral surface of the stator face each other is a radial direction, and a direction along an outer periphery of the stator when viewed from the axial direction is a circumferential direction,
wherein the coil units each include a split core that includes a tooth that extends in the radial direction, an insulator mounted to overlap at least the tooth of the split core, and a coil that includes a winding wound around the tooth of the split core with the insulator interposed therebetween, and

wherein the coil units include a first coil unit, a second coil unit, and a third coil unit annularly and repeatedly arranged in sequence along the circumferential direction; and
a rotor provided to face an inner peripheral surface of the stator.

18. The motor according to claim 17 , wherein the first coil unit includes a first split core, a first insulator, and a first coil that includes a U-phase winding, the second coil unit includes a second split core, a second insulator, and a second coil that includes a V-phase winding, and the third coil unit includes a third split core, a third insulator, and a third coil that includes a W-phase winding.

19. The motor according to claim 18 , further comprising an outer end surface on an opposite side of the tooth in the radial direction of each of the first insulator, the second insulator, and the third insulator is exposed on the outer peripheral surface of the coil unit as

Assignees

• Murata Manufacturing Co

Inventors

• Amano Hisato
• Natsumeda Mitsutoshi
• Sakaguchi Eiji
• Sakurada Takashi
• Sato Takahiro
• Uno Masashi

Classifications

• H02K2203/12

  Machines characterised by the bobbins for supporting the windings · CPC title

• H02K2203/09

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

• H02K21/16

  having annular armature cores with salient poles (with homopolar co-operation H02K21/20) · CPC title

• H02K3/522 Primary

  for generally annular cores with salient poles · CPC title