Rotary electric machine and a method of producing the same

• US 6,952,067 B2
• Filed: 03/07/2002
• Issued: 10/04/2005
• Est. Priority Date: 10/29/2001
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Sakaguchi, Hisato, Tanaka, Toshinori, Yamamoto, Kyouhei
• Primary Examiner(s): MULLINS, BURTON S
• Application Number:
  US10/091,455
• Publication Number:
  US 20030080647A1
• Time in Patent Office: 1,307 Days
• Field of Search: 310/233, 310/248, 451/418, 29/27.B
• US Class Current: 310/248
• CPC Class Codes: H01R 39/46 Auxiliary means for improving current transfer, or for reducing or preventing sparking or arcing
• CPC Class Codes: H01R 43/14 Maintenance of current collectors, e.g. reshaping of brushes, cleaning of commutators
• CPC Class Codes: H02K 13/10 Arrangements of brushes or commutators specially adapted for improving commutation
• CPC Class Codes: H02K 15/00 Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines

Abstract

A surface of a commutator 5 is rubbed by a shakedown brush 21 other than ordinary brushes 11 to produce a carbon coat, whereby a shakedown process can be reduced or abolished.

Claims

1. A rotary electric machine comprising:

a commutator;

brushes sliding on a surface of the commutator; and

an armature,

wherein said surface of the commutator is rubbed by a shakedown brush other than said brushes in advance of assembling the brushes in the rotary electric machine, and

a carbon coat is produced on the surface of the commutator by rubbing the surface with the shakedown brush.

2. The rotary electric machine according to claim 1,

wherein a sliding width of said shakedown brush is larger than a primary sliding width of said brushes.

3. The rotary electric machine according to claim 1,

wherein a material of the shakedown brush is different from that of the brushes.

4. The rotary electric machine according to claim 2,

wherein a material of the shakedown brush is different from that of the brushes.

5. The rotary electric machine according to claim 1,

wherein the rotary electric machine is applied to a motor for electromotive power steering device.

6. The rotary electric machine according to claim 2,

wherein the rotary electric machine is applied to a motor for electromotive power steering device.

7. The rotary electric machine according to claim 3,

wherein the rotary electric machine is applied to a motor for electromotive power steering device.

8. The rotary electric machine according to claim 4,

wherein the rotary electric machine is applied to a motor for electromotive power steering device.

9. A method of manufacturing a rotary electric machine including a commutator, an armature having the commutator, and brushes sliding on a surface of the commutator comprising the steps of:

rubbing the surface of the commutator using a shakedown brush other than the brushes to produce a carbon coat on the surface of the commutator; and

assembling the brushes in the rotary electric machine.

10. The method of manufacturing the rotary electric machine according to claim 9,

wherein the step of rubbing in conducted when the armature stands as a single unit before assembling into the rotary electric machine.

11. The method of manufacturing the rotary electric machine according to claim 9,

wherein the step of rubbing is conducted without applying electricity to the shakedown brush.