Magnetic bearing apparatus with radial position correcting electromagnet
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United States of America Patent
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-
Feb 8, 2000
Grant Date -
N/A
app pub date -
Jan 30, 1997
filing date -
Jan 31, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To prevent the problem of dragging on an auxiliary bearing which tends to occur in a motor in the vicinity of a resonance point of rigid mode during the start-up of a three axis control magnetic bearing apparatus, a radial position correcting electromagnet is provided. The radial position correcting electromagnet has a magnetic pole extending in the direction of a radius of a metal disc of the motor through which the motor shaft passes. A voltage having a short period is applied to the radial position correcting electromagnet at a plurality of times in the vicinity of the resonance point of rigid mode upon start-up of the motor to attract the metal disc and thereby adjust the radial position of the shaft to prevent excessive contact between the shaft and other parts of the three axis control magnetic bearing apparatus.
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