| 摘要 |
PURPOSE:To eliminate irregular torque of a motor with a unipolar structure by interposing a magnetic core wound with a toroidal coil between a pair of rotor magnets. CONSTITUTION:Two rotor magnets 3, 4 fully magnetized with N-poles and S- poles on the respective surfaces are held on a rotational shaft 1 at the prescribed intervl so that the same polarity poles are opposed to each other, two magnetic cores 7, 8 are secured into the air gap, and coils 9, 10 wound in torochoidal shape are provided on a circular-arc-shaped part formed partly at the core. In this manner, since a flat DC motor can be constructed in a unipolar structure, the split magnetization of the rotor magnet and the polyphase of the armature coil can be eliminated, thereby eliminating rotary phase detecting means such as Hall element and obviating the cause of occurring irregular torque. |
