Sensorless technology, estimation of sampled back EMF voltage values and/or the sampled inductance values based on the pulse width modulation periods

摘要

The methods and devices provided herein include methods and devices for controlling a permanent magnet motor. In one implementation, a method is provided that allows for the determination of the values of the phase back EMF voltage and of the phase inductances while the phases are powered with a PWM (Pulse Width Modulation) controlled current and/or voltage.