Spindle apparatus
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United States of America Patent
Stats
-
Mar 27, 2001
Grant Date -
N/A
app pub date -
Mar 17, 1995
filing date -
Mar 17, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A spindle apparatus comprises a rotary body and at least a pair of magnetic bearings for levitating the rotary body by magnetic forces. A combined motor and magnetic bearing device is disposed between the magnetic bearings for imparting a rotational torque to the rotary body and for positionally controlling the rotary body by magnetic forces. A control circuit outputs and exciting current to the magnetic bearings and the combined motor and magnetic bearing device and for makes an adjustment of the exciting current of the magnetic bearing and the combined motor and magnetic bearing device to hold the rotary body afloat in a predetermined position.
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