System and method for improving the operation of electronically controlled motors
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United States of America Patent
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Dec 26, 2017
Grant Date -
Dec 21, 2017
app pub date -
Jun 20, 2016
filing date -
Jun 20, 2016
priority date (Note) -
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Abstract
An electrical motor controller changes the PWM frequency that is used by a motor driver to form the fundamental frequency and voltage magnitude for the electrical power delivered to an electrical motor. The electrical motor controller compares a signal generated by a first sensor that indicates an output speed of the motor to a predetermined speed threshold and compares a signal generated by a second sensor that corresponds to phase currents in the electrical motor to a predetermined motor power threshold. These comparisons are used to set the PWM frequency for the motor driver. The PWM frequency either corresponds to a frequency in a humanly imperceptible audio range or to a frequency that is in a humanly perceptible audio range.
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