Motor
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United States of America Patent
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Aug 25, 2009
Grant Date -
Jul 6, 2006
app pub date -
Jul 5, 2004
filing date -
Jul 4, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A motor has a rotor core with a plurality of first non-magnetic layers and a plurality of second non-magnetic layers. The rotor core has a plurality of magnets. The first and second non-magnetic layers are positioned to cancel n-th order harmonics. Therefore, a specific order, for example 5-th order and 7-th order, harmonics component of a magnetic flux distribution waveform (induction voltage waveform) is reduced and unnecessary radial force and thrust force is prevented from occurrence, while sufficient magnetic flux is maintained.
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