Armature and rotating electric machine

Patent metadata

Field	Value
Publication number	US-12381430-B2
Application number	US-202117410190-A
Country	US
Kind code	B2
Filing date	Aug 24, 2021
Priority date	Feb 25, 2019
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

An armature includes an armature winding of multiple phases having phase windings, for each phase, that includes a plurality of partial windings, and a base member that includes a circular cylindrical back yoke. The partial winding includes a pair of intermediate conductor portions and crossover portions that connect the intermediate conductor portions in an annular shape. A conductor is wound in multiple layers in the intermediate conductor portions and the crossover portions. An interference prevention portion extends in a radial direction. The intermediate conductor portions are arrayed in a predetermined order in the circumferential direction, by one of the intermediate conductor portions of a first phase being arranged between the intermediate conductor portions of the partial winding of a second phase. The partial windings are assembled to the back yoke in a state in which an insulation layer is interposed between the intermediate conductor portion and the back yoke.

First claim

What is claimed is:

1. An armature having a toothless structure, the armature comprising:
an armature winding of multiple phases that has phase windings, for each phase, that each include a plurality of partial windings; and
a base member that includes a circular cylindrical back yoke, wherein
the partial winding includes
a pair of intermediate conductor portions that are provided so as to be separated at a predetermined interval in a circumferential direction,
crossover portions that are provided on a first end side and a second end side in an axial direction and connect the pair of intermediate conductor portions in an annular shape,
a conductor that is wound in multiple layers in the pair of intermediate conductor portions and the crossover portions, and
an interference prevention portion that extends in a radial direction and prevents interference between the partial windings that are adjacent to each other in the circumferential direction, in at least either of the crossover portions on both sides in the axial direction,

the intermediate conductor portions of the phases are arrayed in a predetermined order in the circumferential direction, by one intermediate conductor portion of the pair of intermediate conductor portions of the partial winding of a first phase being arranged between the pair of intermediate conductor portions of the partial winding of a second phase,
the partial windings are assembled to the back yoke in a state in which a first insulation layer is interposed between the intermediate conductor portion and the back yoke, and in which a second insulation layer is provided on a side opposite the back yoke in the intermediate conductor portion, and
a thickness dimension of the first insulation layer is larger than a thickness dimension of the second insulation layer.

2. The armature according to claim 1 , wherein:
the armature winding includes a plurality of coil modules that include the partial windings, a back-yoke-side insulation wall that is provided on the back yoke side of the intermediate conductor portion in the partial winding, and a counter-back-yoke-side insulation wall on a side opposite the back-yoke-side insulation wall with the intermediate conductor portion therebetween in the radial direction;
the plurality of coil modules are arranged in an array in the circumferential direction on an inner side in the radial direction or an outer side in the radial direction of the back yoke; and
the back-yoke-side insulation wall is provided as the insulation layer, and the counter-back-yoke-side insulation wall is provided as the second insulation layer.

3. The armature according to claim 2 , wherein:
in the coil module, the back-yoke-side insulation wall includes extending portions that extend further in the circumferential direction than the intermediate conductor portion on both sides in the circumferential direction of the intermediate conductor portion; and
in a state in which the plurality of coil modules are arranged in an array in the circumferential direction, the extending portions of differing coil modules are provided so as to oppose each other in the circumferential direction, between the intermediate conductor portions that are adjacent to each other in the circumferential direction.

4. The armature according to claim 3 , wherein:
a circumferential-direction insulation wall that extends in the radial direction towards a portion between the intermediate conductor portions that are arrayed in the circumferential direction from the back-yoke-side insulation wall is provided on a side of at least either of the extending portions on both sides in the circumferential direction of the intermediate conductor portions in the back-yoke-side insulation wall.

5. The armature according to claim 4 , wherein:
the circumferential-direction insulation walls of differing coil modules are provided so as to oppose each other in the circumferential direction, between the intermediate conductor portions that are arrayed in the circumferential direction.

6. The armature according to claim 4 , wherein:
the circumferential-direction insulation wall has a thickness dimension in the circumferential direction that differs between positions on the inner side in the radial direction and the outer side in the radial direction, and the thickness dimension on the outer side in the radial direction is larger.

7. The armature according to claim 2 , wherein:
the coil module includes an insulating winding holder that has at least the back-yoke-side insulation wall and the counter-back-yoke-side insulation wall, and the partial winding is integrated with the winding holder.

8. The armature according to claim 2 , wherein:
the plurality of coil modules are integrally molded with the back yoke by an insulating material.

9. The armature according to claim 2 , wherein:
the coil module includes a covering portion that covers a periphery of the partial winding by an insulating material, and in the covering portion, the first insulation layer serves as the back-yoke-side insulation wall, and the second insulation layer serves as the counter-back-yoke-side insulation wall.

10. The armature according to claim 2 , comprising:
a restraining member that restrains the plurality of coil modules in a state in which the plurality of coil modules are urged toward the base member in the radial direction.

11. The armature according to claim 10 , wherein:
the armature is provided so as to oppose a magnet portion that configures a field element in the radial direction; and
the restraining member is provided, in the axial direction of the coil module, in a position that does not oppose the magnet portion in the radial direction.

12. The armature according to claim 1 , wherein:
the armature winding has phase windings of three phases that are connected to one another; and
in the partial winding, the pair of intermediate conductor portions are provided so as to be separated by two coil pitches, and one intermediate portion each of the partial windings of the other two phases are arranged between the pair of intermediate conductor portions.

13. The armature according to claim 1 , wherein:
the partial winding includes a radial-direction curved portion that extends in the radial direction in at least either of the crossover portions on both sides in the axial direction, as the interference prevention portion.

14. The armature according to claim 13 , wherein:
the partial winding includes
a first partial winding in which an outward curved portion that is curved towards the outer side in the radial direction is provided in the crossover portion in a first coil end on a first side of coil ends on both sides in the axial direction, as the radial-direction curved portion, and
a second partial winding in which an inward curved portion that is curved towards the inner side in the radial direction is provided in the crossover portion in a second coil end on a second side of coil ends on both sides in the axial direction, as the radial-direction curved portion, and

the first partial winding and the second partial winding are assembled to the back yoke such that the crossover portion of the second partial winding is positioned on the outer side in the axial direction of the crossover portion of the first partial winding on the first coil end side, and the crossover portion of the first partial winding is positioned on the outer side in the axial direction of the crossover portion of the second partial winding on the second coil end side.

15. The armature according to claim 14 , wherein:
the first partial win

Assignees

• Denso Corp

Inventors

• Tamura Akito

Classifications

• H02K21/12

  with stationary armatures and rotating magnets · CPC title

• H02K1/278

  Surface mounted magnets; Inset magnets · CPC title

• H02K1/2786

  Outer rotors · 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

• H02K3/47

  Air-gap windings, i.e. iron-free windings · CPC title