Magnetic field type of rotary electric apparatus
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United States of America Patent
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Apr 5, 2005
Grant Date -
Aug 26, 2004
app pub date -
Feb 9, 2004
filing date -
Feb 14, 2003
priority date (Note) -
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Abstract
Several embodiments of rotating electrical machines where cogging torque is reduced as well as the distortion of the back emf and improve torque characteristic with reduced torque ripples by dividing either the permanent magnets and/or the poles of the coil windings in axially separated portions that are circumferentially shifted relative to each other.
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