| 摘要 |
PURPOSE:To avoid uneven rotation in a medium high speed range due to resonance and beat phenomena put together, by arranging the salient poles of a stator to get out of position. CONSTITUTION:A rotor 3 is organized by forming a plurality of small teeth at equal pitch on the periphery on a permanent magnet magnetized in the axial direction, and a stator 2 confronting the rotor 3 is provided with stator salient poles 2-1-2-8 having a plurality of small teeth at the tip sections. The stator salient poles 2-1-2-8 are arranged so that phase difference between the stator salient poles 2-1-2-8 and the small teeth of the rotor cannot be monotonously increased or reduced in order of the arrangement of the stator salient poles 2-1-2-8. In this manner, the small teeth of the stator salient poles 2-1-2-8 are prevented from getting out of the small teeth of the rotor in appearance by several pitch small teeth of the rotor per motor cycle, and beat due to two vibrating factors is contrived not to be generated. |
