Method and apparatus for load torque detection and drive current optimization
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United States of America Patent
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-
May 7, 2002
Grant Date -
N/A
app pub date -
Oct 23, 2000
filing date -
Oct 23, 2000
priority date (Note) -
Expired
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Abstract
The load torque applied to the shaft of a synchronous motor is estimated based upon a correlation established between load torque and a calculated integral of a drive current value, utilizing the measured current that is applied to drive the motor. The estimated load torque is used as the basis for controlling the driving current amplitude so as to achieve increased efficiency of energy utilization. Control apparatus embodies the technique, and a synchronous motor system includes such apparatus.
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