Sensorless motor control

摘要

An method for driving a motor is provided. A plurality of pulse width modulation (PWM) signals are generated from a commanded voltage signal and a commanded angle signal, and these PWM signal are used to drive a motor (which has a plurality of phases). Currents through the phases of the motor are measured, and a Park transformation is performed on the measured currents to determine a projection current measurement. Based at least in part on the projection current measurement, the adjusting the commanded voltage signal and the commanded angle signal can be adjusted.

主权项

1. A method comprising:
generating a plurality of pulse width modulation (PWM) signals from a commanded voltage signal and an commanded angle signal; driving a motor with the plurality of PWM signals, wherein the motor has a plurality of phases; measuring currents through the phases of the motor; performing a Park transformation on the measured currents to determine a projection current measurement; and adjusting the commanded voltage signal and the commanded angle signal based at least in part on the projection current measurement; generating the commanded voltage signal from a frequency of the reference signal; integrating the reference signal to determine the commanded angle signal; wherein the projection current measurement further comprises a field current measurement; controlling the field current measurement with a proportional-integral (PI) controller to generate a control signal; adding the control signal to the commanded voltage signal; and subtracting the control signal from the commanded angle signal.