Motor using a rotor including an interior permanent magnet
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United States of America Patent
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-
Dec 28, 1999
Grant Date -
N/A
app pub date -
Jul 22, 1998
filing date -
Jul 22, 1997
priority date (Note) -
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status (Latency Note)
Importance
Abstract
In a motor having a permanent magnet built in a rotor, a hole for preventing a short-circuit of magnetic flux is disposed so that the hole is adjacent to the outer rim of rotor core, and adjoins to a slit for receiving a permanent magnet as well as the permanent magnet per se. This structure prevents a short-circuit of magnetic flux generated by both ends of the permanent magnet, and the magnetic flux at both ends of the magnet can flow to a stator, thereby contributing to generate torque effectively. As a result, the highly efficient motor with less cogging torque, less vibration and lower noise can be provided.
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