| 摘要 |
PURPOSE:To reduce a static cogging by projecting auxiliary poles on other pole adjacent from the pole of a main magnet corresponding to a core having a plurality of slots. CONSTITUTION:Parts of poles 11, 12 such as, for example, auxiliary poles 11a, 12a of other adjacent poles are projected from the upper ends to form a static cogging cancelling magnetizing pattern. The poles 11, 12 of N-pole and S-pole of a main magnet 8 of a rotor 9 are effectively operated at the core 1 of a stator 2, and the variation in the magnetic flux passing between the slots 3 of the core 1 from the poles 11, 12 of the magnet 8 decreases due to the partial cancel of the mutual action of the variation in the magnetic flux from the poles 11a, 12a, thereby reducing a static cogging. |
