| 摘要 |
PURPOSE:To increase the torque of a motor by disposing a brush at a geometrical neutral axis side with respect to a magnet relatively by the movement of the magnet due to the balance between the rotary force of an armature and an elastic member. CONSTITUTION:A brush 11 is disposed at an electrical neutral axis with respect to a magnet 2 by an elastic member 10 at normal time to improve the commutation of the brush 11. When a high torque is required, a current flowed to the copper wire of an armature 7 increases, the magnet 2 is moved by the force due to the current, an advancing angle between the brush 11 and the magnet 2 is reduced to be used at the position having high torque characteristic of a motor. |
