| 摘要 |
A PM type stepping motor is provided capable of further reducing the higher harmonic component of detent torque. n sets of teeth groups, each consisting of m stator polar teeth, are set for each of an outer yoke and an inner yoke, and the pitch P2 of the stator polar teeth, the pitch P3 of the teeth groups, and the pitch P1 of the N and S poles of permanent magnets are set such that the relationship: P2<> P1, P3<> m.P1, and P3<> m.P2 holds true, where P1, P2 and P3 are electrical angles, and m and n are integers equal to or larger than 2.
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