Motor control apparatus and motor control method
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United States of America Patent
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Feb 5, 2019
Grant Date -
Feb 6, 2014
app pub date -
Jul 24, 2013
filing date -
Jul 31, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A motor control apparatus applying a sinusoidal drive waveform to a motor and including a position detection unit outputting a signal according to a motor shaft's position; and a control unit: acquiring a phase value of the motor's drive waveform when a signal is output by the position detection unit, changing a cycle of the drive waveform by measuring time from a previously output signal to a presently output signal, comparing the phases of the drive waveform and the motor shaft, and controlling to change to a cycle at which a phase value of the drive waveform matches a target phase value when a travel time corresponding to a phase value for adjustment has elapsed from a present time when a phase value of the drive waveform presently acquired differs from a target phase value acquired when the motor's drive current and drive voltage are in a designated phase relationship.
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