| 摘要 |
PURPOSE:To maintain high responsiveness and to enable to stop at the prescribed position and to drive stepwisely a coreless motor by disposing equi- distantly two or more induction pieces made of high magnetic permeable material to the rotating directin of the coil surface. CONSTITUTION:A cup-shaped coil 3 is disposed in an air gap between a motor housing 1 and a cylindrical magnet 2 radially magnetized with two poles, induction pieces 7 made of three thin permalloy plates of high magnetic permeability material are disposed equi-distantly to the rotating direction of the outer surface of the coil, and the rotor 8 of a motor is formed together with a shaft 4 and a commutator 5. In this manner, six stationary stable points are determined equi- distantly for one revolution of the rotor, the stopping positions are determined at an interval of 60 deg. per one revolution of a motor shaft, thereby stopping at the prescribed positions. |
