Controller for brushless DC motor with low torque ripple and method therefor
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United States of America Patent
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Nov 3, 2015
Grant Date -
Jul 2, 2015
app pub date -
Jan 2, 2014
filing date -
Jan 2, 2014
priority date (Note) -
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Abstract
A controller for a BLDC motor includes a pulse width modulator and a control circuit. The pulse width modulator provides at least one phase control signal for a corresponding phase of the BLDC motor with a pulse width determined by a duty cycle signal. The duty cycle adjustment circuit has an input for receiving the at least one phase control signal, and an output for providing a corresponding modified phase control signal by adjusting widths of pulses of the at least one phase control signal when an average current in said corresponding phase exceeds a threshold.
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