Restraining the instability of a stepper motor
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United States of America Patent
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-
Jun 16, 1987
Grant Date -
N/A
app pub date -
Feb 28, 1985
filing date -
Nov 6, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an apparatus and method for preventing instability of a stepper motor operated by a plurality of alternating currents of different respective phases and controlled by a sequence of control pulses, the control pulses defining an angular parameter of the stepper motor, the steps include determining the sum of the phase currents, transforming the sum of the phase currents into a voltage fluctuating about an average value, determining the average voltage, and thereafter feeding back the fluctuating voltage so as to angle-modulate said control pulses.
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