| 摘要 |
PURPOSE:To perform a frequency generator for controlling the speed with a simple structure by forming a frequency generator gear at part of the yoke. CONSTITUTION:A frequency generator (FG) rotor gear 4 and a rotor magnet 5 which operates also as an FG rotor magnet are provided on a shaft 3 which is rotatably supported via bearings 2, 2' which are respectively provided at supporting plates 1, 1', the magnet 5 is magnetized with multipoles in a rotating direction, and rotated by the energization of a drive coil 6. On the other hand, the FE 4a is formed on the outer periphery of the rotor gear 4 which operates also as the yoke of the magnet 5 to generate a magnetic field which is coarse in the rotating direction between the gear 4a and the magnet 5. |
