Brush wear detector of rotary electric machine

Abstract

Abstract PURPOSE:To obtain a rotary electric machine which has high reliability by opposing the cutting surface of an optical fiber to the side opposed to a brush retainer, and detecting the wear amount of a brush by the presence or absence of a light transmission. CONSTITUTION:A brush 2 which is inserted into a brush retainer 1 is contacted with a rotary current collector 17 of a rotary electric machine and energized. Since the brush 2 is worn by the operation of the machine, the timing change of the wear amount is detected to prenotify the exchanging time of the brush 2. The brush wear detector has a plurality pair of holes 14 at the opposed sides of the retainer 1, and an optical fiber 13 inserted fixedly to be opposed to the holes 14. Thus, a light is transmitted from a light source 15 from the end of one optical fiber 13, a photodetection indicator 16 is provided at the end of the outher optical fiber 13 to detect and indicate the transmitted light. Thus, the source 15 can be mounted separately from the retainer 1 which is frequently vibrated to extend the life.

Inventors

• 👤 Toshiyuki Aso
• 👤 阿曾　俊幸
• 👤 Tadahisa Hagita
• 👤 萩田　忠久

Bibliographic Details