| 摘要 |
A stepping motor has a stator; and a rotor disposed to surround the stator. The stator includes annular first and second stator yokes disposed to face each other, each having a plurality of pole teeth formed along a circumference thereof, and an annular stator coil disposed between the first and second stator yokes. The rotor includes an annular magnet disposed to surround the first and second stator yokes, which has a plurality of magnetic poles formed along a circumference thereof, and a shaft disposed on a central portion of the magnet. A part of the plurality of pole teeth of the first stator yoke is a first commutating pole which has a width different from the widths of the other pole teeth. A part of the plurality of pole teeth of the second stator yoke is a second commutating pole which has a width different from the widths of the other pole teeth and the first commutating pole, and is disposed adjacent to the first commutating pole. Center lines of gaps between the pole teeth of the first stator yoke are displaced from center lines of the pole teeth of the second stator yoke.
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