Machining apparatus having a main spindle supported by magnetic bearings
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United States of America Patent
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-
Jun 25, 1991
Grant Date -
N/A
app pub date -
Nov 1, 1988
filing date -
Nov 6, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A machining apparatus having a main spindle supported by magnetic bearings which controls machining conditions by controlling electric current values flowing in electromagnets according to predetermined conditions, thereby obtaining an optimum machining condition and thus improving accuracy and machining efficiency. The machining apparatus comprises a spindle having a tool at its one end, electromagnets for radially and axially supporting the spindle by magnetic force without contact to the spindle, position detecting means for detecting radial and axial positions of the spindle, control means responsive to outputs from the position detecting means for controlling current flowing in the electromagnets, current measuring means for measuring current values flowing in at least one of the electromagnets, and machining control means for controlling machining conditions by controlling current values at the electromagnets according to the measured current values.
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