Load torque detection and drive current optimization determination met
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United States of America Patent
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-
Nov 21, 2000
Grant Date -
N/A
app pub date -
Feb 16, 1999
filing date -
Feb 16, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The voltage at a node between a pair of series-connected windings of a synchronous or stepping motor is monitored during operation so as to detect transition voltage regions, the durations of which are indicative of the torque load on the motor and which are used as the basis for controlling the driving current amplitude so as to achieve enhanced efficiency of energy utilization. An optimum value for the duration of the transition voltage region will usually be established as a target, and adjustments will be so made as to conform subsequently detected node voltage values to those of the target.
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