| 摘要 |
PURPOSE:To provide a brushless DC motor having a high rotating accuracy by reducing a variation in a rotating speed of a rotor magnet by utilizing a magnetic attracting/repelling force with the magnet. CONSTITUTION:A magnet 11 for cancelling a variation in a rotating speed of a rotor magnet 1 is mounted at a predetermined position of a coil board 8 or a coil side back yoke 7. A variation in a rotating torque of a reverse phase to a period of a variation in rotation is applied to the magnet 1 by interaction of magnetic attraction/repellence of the magnet 11 and the rotor 1 thereby to suppress an irregularity in the rotation of the rotor 1. |
