| 摘要 |
PURPOSE:To suppress a noise generated from a brush and a commutator by providing the brush contacted with the side of the commutator and a coil spring, applying a voltage through a coil spring member to the brush, and further providing a magnetic core at the member. CONSTITUTION:A brush holder 9a secured to a bracket 4a holds a brush 10a, and a coil member 11a has a magnetic core 13 passing a coil. One end of the member 11a is pressed on the groove 15 of the brush 10a, and the brush 10a is contacted with a commutator 7a. Noise of high frequency components due to a spark generated between the commutator 7a and the brush 10a is transmitted from the brush 10a through the member 11a to a power line 15, but when the current passes the member 11a, a choke coil is formed by the member 11a and magnetic cores 13, 14, thereby preventing only the high frequency components. |
