Rotor for an electric machine
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United States of America Patent
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May 15, 2012
Grant Date -
Jan 28, 2010
app pub date -
Jul 1, 2009
filing date -
Jul 28, 2008
priority date (Note) -
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Abstract
A rotor for an electrical machine includes a rotor hub and a plurality of permanent magnet segments affixed around a perimeter of the rotor hub. A first plurality of the permanent magnet segments have a substantially uniform arcuate span and are formed of a single unitary piece of material. A multi-piece permanent magnet segment includes at least two pieces, each having a smaller arcuate span than the first plurality of segments. The magnetization direction vector of one piece different than the magnetization direction vector of at least one other piece in each multi-piece segment.
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