| 摘要 |
PURPOSE: To reduce the torque ripple of a DC motor and, further, improve an effective torque smoothly. CONSTITUTION: A magnet 1 is made to touch or come close to the coil part 4 of a magnetizing coil unit 2 and the coil part 4 is excited to magnetize the magnet 1 so as to have a required pole arrangement 14. When the coil part 4 is excited and the magnet 1 is magnetized, a magnetic yoke member 7 which has a nonmagnetic conducting part 9 in its inner circumference 13 is provided on the outer circumference 12 of the magnet 1. |
