| 摘要 |
PURPOSE:To reduce torque ripple, by providing a rotor magnet with the magnetized sphere of a specified form, and by using driving current showing the change of trapezoidal wave, as current being conducted to a coil. CONSTITUTION:A rotor magnet 8 used for a brushless motor is provided with magnetized sections 9 and non-magnetized sections 10. The non-magnetized sections 10 are set in convex shapes like upside-down bowls toward the axial center from the outer periphery, with the centers of positions between the respective magnetic poles on the outer peripheral section of the rotor magnet 8. When the rotor magnet 8 is rotated, then torque generated from the motor can be made constant regardless of the rotational angle of the rotor magnet 8. |
