Armature and motor on which the armature is mounted

• US 7,576,467 B2
• Filed: 08/30/2006
• Issued: 08/18/2009
• Est. Priority Date: 08/31/2005
• Status: Active Grant

• Current Assignee: Nidec Corporation
• Original Assignee: Nidec Corporation
• Inventors: Mori, Yoichi, Urakami, Hitoshi, Yamamoto, Masato
• Primary Examiner(s): Nguyen; Tran N
• Application Number:
  US11/512,240
• Publication Number:
  US 20070046132A1
• Time in Patent Office: 1,084 Days
• Field of Search: 310 42- 43, 310216-218, 310/215, 336/212, 336/233, 336/234
• US Class Current: 310/216.009
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 3/325 for windings on salient poles, such as claw-shaped poles

Abstract

An extension part of an insulator covering a part of a coupling portion of a laminated core of an armature is inclined to the inside in the radial direction along the coupling part. A inclined face which is extended inward in the radial direction is formed in the cylindrical part of the armature. By forming the armature in an annular shape, a gap which is almost parallel or narrowed to the inside in the radial direction is formed between neighboring inclined faces. The gap is formed to be smaller than the diameter of a conductor.

Claims

1. An armature formed by winding coils around laminated cores and bending the laminated cores in an annular shape, comprising:

a plurality of core back parts circularly arranged to form an annular core back, each of the core back part having a tooth projecting toward a center of the annular core back;

coupling portions of the core back, which couple the core back parts neighboring in a circumferential direction of the annular core back and yield at the time of bending;

a plurality of insulators, each of the insulator attached to each of the core back part to cover an inner peripheral face of the core back part and a surface of the tooth, and made of an electrically insulating material; and

coils formed by continually winding a conductor around the teeth over the insulators, the conductor extending at radially inner positions to the coupling portion of the core back;

wherein;

a side edge in the circumferential direction of the insulator is positioned closely to a neighboring insulator forming a gap; and

a diameter of the conductor measured perpendicular to a longitudinal direction thereof is greater than a width of the gap.

2. The armature according to claim 1, wherein a part of the insulator covering the inner peripheral surface of the core back part has an extension part at a side thereof extending toward the circumferentially neighboring insulator, the extension part having thinner thickness in a radial direction of the annular core back than that of a body of the insulator.

3. The armature according to claim 1, wherein the insulator further comprises an insulator coupling part for coupling insulators neighboring in the circumferential direction, and

the coupling part is deformed more easily than the insulator body at the time of bending.

4. The armature according to claim 2, wherein an inner peripheral face of the extension part is bent toward the center of the annular core back.

5. The armature according to claim 2, wherein the side edge of the extension part and the surface of the insulator neighboring the side edge in the circumferential direction are parallel with each other or the gap therebetween increases toward the outside in the radial direction.

6. The armature according to claim 5, wherein the gap between the side edge of the extension part and the surface of the neighboring insulator is smaller, on the side closest to the center axis, than the diameter of the electric conductor.

7. The armature according to claim 2, wherein the insulator has an coupling part that couples insulators neighboring in the circumferential direction;

at least two neighboring insulators are coupled by a coupling part which is connected to the insulators at the extension parts thereof; and

the coupling part is deformed more easily than the bodies of the insulators at the time of bending.

8. A motor comprising:

the armature according to claim 1;

a rotator rotating about a predetermined rotation axis and having a driving magnet that faces the inner peripheral surface of the teeth in the radial direction; and

a bearing rotatably supporting the rotator.