Stepping motor
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United States of America Patent
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-
Apr 12, 2011
Grant Date -
Sep 3, 2009
app pub date -
Dec 23, 2008
filing date -
Feb 28, 2008
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A single phase stepping motor has a stator, and a rotor disposed to surround the stator. The stator includes first and second annular stator yokes, which are disposed opposite to each other and have 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 a ring magnet, which is disposed to surround the first and second stator yokes, and has a plurality of magnetic poles formed along a circumference of the rotor, and a shaft disposed at a center position of the magnet. At least a partial region of a gap formed between each of the pole teeth and the opposing magnetic pole of the magnet is non-uniform in a predetermined direction.
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