| 摘要 |
PURPOSE:To eliminate a torque ripple and to enhance the efficiency of a two- phase brushless motor by providing a demagnetizing interpole at the position of the specific angle from a pole inverting boundary of a main pole in a field formed with a portion which does not substantially generate a torque between main poles. CONSTITUTION:A 2-phase brushless motor is formed by opposing a rotor magnet having a field provided with an electroless pole 2 which does not effectively generate or weakens a torque along a rotating direction between main pole pairs N, S and a stator having an armature displaced at 180 deg. at the interval of two sides which contributes to the torque generation of 2-phase coil. In this case, an interpole 5 for demagnetizing a pole effective to generate a torque is provided at a position of approx. 90 deg. (gamma=90+ or -10 deg.) from the pole inverting boundary K of main pole pair. Thus, the reduction of the absolute torque is minimized to effectively reduce the torque ripple. |
