| 摘要 |
PURPOSE:To always stop a device at a re-starting position, by providing an auxiliary yoke on a torque-generating contribution section opposite to the rotor magnet side of driving coils, and by providing the auxiliary yoke, with a salient section protruded to the internal side surface of the driving coils. CONSTITUTION:On a torque-generating contribution section opposite to the rotor magnet 5 side of driving coils 8, an auxiliary yoke 10 made of a soft magnetic member is set. The auxiliary yoke 10 is provided with a salient section 11 protruded to the internal side surface of the driving coils 8. When current fed to the driving coils 8 is interrupted to stop rotational state, then the magnetic poles of a rotor magnet 5 closest to the salient section 11 are attracted by the salient section 11 of the auxiliary yoke 10. Because of said attracting force, the motor stops at a relative position where the center of the rotational direction width and that of the magnetic pole of the rotor magnet 5 do not coincide with each other. |
