Electric motor with permanent magnet rotor
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United States of America Patent
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-
May 21, 1985
Grant Date -
N/A
app pub date -
Aug 3, 1983
filing date -
Dec 4, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The motor according to the invention comprises a disc-shaped rotor with multipolar permanent magnetization along an annular area and a stator comprising a plurality of magnetic circuits (9, 10, . . . ) arranged so that the magnetic field is comprised within the two cylindrical face portions based on the magnetized annular area and located on either side of the rotor. Means for compensation of the harmonics of the current-free torque and of the current torque are provided, as well as the arrangement of magnetic pick-ups (25, 26). The invention applies to industrial synchronous motor which may operate as stepping motors.
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