Rotor for a permanent magnet electric machine
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United States of America Patent
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Jun 17, 2014
Grant Date -
May 26, 2011
app pub date -
Nov 25, 2009
filing date -
Nov 25, 2009
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A rotor for a permanent magnet electric motor includes a rotor core having a generally cylindrical shape with an outer circumferential surface and a rotational axis and a plurality of magnet insertion hole arrangements formed in the rotor core and arranged circumferentially at a preset angular interval about the rotational axis. Each hole arrangement has a radially inward side, a radially outward side, and two ends that are respectively spaced apart from the circumferential surface by respective bridge regions formed by the rotor core. The material of the bridge regions is metallurgically transformed by having its grain structure changed, e.g., by heating the material to at least its Curie temperature, whereby the material possesses greater magnetic reluctance than the material of adjacent portions of the rotor core.
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