| 摘要 |
A brushless motor includes a rotor having a permanent magnet magnetized N pole and S pole alternately in a rotary direction, and a stator having a core facing the permanent magnet in a radial direction and a bearing which rotatably supports the rotor. The core includes plural salient poles at its ends, and slot inclusive-angle A, slot inclusive-angle B, slot inclusive-angle C are available between the salient poles adjacent to each other. When a relation of A<B<C is found, those slot inclusive-angles vary multilevel along the rotary direction in the sequence of A-B-C-B-A-. This structure allows the rotor to be urged always in a radial direction by a lateral pressure, so that the brushless motor with a fewer vibrations and a more accurate rotation is obtainable at a lower cost.
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