| 摘要 |
PURPOSE:To enable to smoothly start a rotor while maintaining preferable rotating characteristics by arranging one of main poles of the second stator at the position of an electric angle slightly displaced by specific integer magnification to the main poles of the first stator. CONSTITUTION:A rotor shaft 2 is rotatably mounted in a cylindrical hollow case 4 of the first stator, and main poles 4a and interpoles 4b of the case 4 are formed oppositely to the N- and S-poles of a permanent magnet 3 on the periphery of the cylindrical case. A core 5 formed of zinc plated steel plate and of the second stator formed integrally with the case 4 is displaced at alpha deg. of integer times of 180 deg. at the main pole 5a to the main pole 4a of the case 4, e.g., alpha deg.=1 deg.-7 deg. of a slight range as the fluctuating angle alpha deg. of the rotor 1. In this manner, the rotor can be smoothly started while maintaining the rotating characteristic, and the oscillation of this case can be prevented. |
