Rotor for a permanent magnet electric machine

Details Rotor for a permanent magnet electric machine Rotor for a permanent magnet electric machine

H - Electricity

02

K

H02K 15/03 (2006.01) H02K 1/27 (2006.01) H02K 1/28 (2006.01)

Patent

CA 2721987

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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