Permanent magnet electric rotating machine and electromotive vehicle using permanent magnet electric rotating machine
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United States of America Patent
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Jun 12, 2012
Grant Date -
Mar 17, 2011
app pub date -
Nov 22, 2010
filing date -
Oct 18, 1996
priority date (Note) -
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Abstract
A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.
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