Compact cylindrical stepping motor and advancing device
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United States of America Patent
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Nov 3, 1998
Grant Date -
N/A
app pub date -
Apr 2, 1997
filing date -
Apr 8, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
An ultra compact motor, comprises a magnet which is formed in a cylindrical shape and is circumferentially divided into n portions and alternately magnetized into different magnetic poles at least on the external periphery thereof. A first coil, a rotor and a second coil are arranged in this order along the axial direction of the rotor, and first external and internal magnetic poles magnetized by the first coil are arranged so as to oppose respectively the external and internal peripheries of the magnet at an end of the magnet while second external and internal magnetic poles magnetized by the second coil are arranged so as to oppose respectively the external and internal peripheries of the magnet at the other end of the magnet.
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