Magnetizing method for a permanent-magnet motor
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United States of America Patent
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-
Jul 4, 2000
Grant Date -
N/A
app pub date -
Jun 25, 1998
filing date -
Jun 27, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
In a method of magnetizing a material of a permanent magnet portion provided in a rotor for a permanent-magnet motor, the material of the permanent magnet portion is embedded inside the rotor body, while the permanent magnet material has anisotropy in a direction penetrating the permanent magnet portion in section, and then the rotor is incorporated in a magnetizing unit and held in a rotatable manner, and the permanent magnet material is magnetized by flowing a magnetizing current through windings under the condition that the rotor is rotatably held in the magnetizing unit. Thus, the permanent magnet material is completely magnetized in a normalized direction, and even if the rotor is shifted from the normalized position, the rotor is retained back to the normalized position by a magnetic torque.
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