COMPENSATION METHOD OF ZERO-CURRENT-CLAMPING EFFECT IN PULSATING CARRIER-SIGNAL INJECTION-BASED SENSORLESS DRIVES

摘要

The present invention relates to a method of compensating a zero- current-c lamping effect in an alternating current (AC) motor without position and speed sensors. According to this method, a high frequency current data is collected from an off-line test for a high frequency injection sensor less drive AC motor so as to obtain a d-q axis inductance, and then a distortion coefficient caused by a zero-current-c lamping effect is found based on the obtained d-q axis inductance. A resultant coefficient value obtained by multiplying the found distortion coefficient by an actual high frequency current allows the zero-current-clamping effect to be compensated through an on-line compensator in an actual operation situation, and the compensation voltage calculated by the on-line compensator is out put ted while being limited to the maximum distortion voltage by a switching element of an inverter.