REDUCED COGGING TORQUE PERMANENT MAGNET MACHINE
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United States of America Patent
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Issued Date -
May 29, 2014
app pub date -
Nov 28, 2012
filing date -
Nov 28, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An electric machine is formed by a stator and a rotor that is free to rotate about an axis of rotation. The stator may have teeth projecting from a body portion and that define slots for housing electrical windings. The rotor may have a rotor core and a number of magnets supported on a peripheral face of the rotor in substantially contiguous arrangement and of alternating magnetization. The rotor magnets are shaped so that pairs of adjacent magnets oppose one another along magnetic boundary lines that are skewed relative to the slots formed in the body portion of the stator. For example, the shape of the rotor magnets may be arcuate trapezoidal or parallelogramatic. In this configuration, cogging torque experienced by the rotor during operation of the electric machine may be reduced.
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