Position and Speed Sensorless Control Method for Salient-Pole Brushless DC Motor with Estimated Values Correction

摘要

In this paper, a sensorless control drive of a salient-pole brushless DC motor with an estimated values correction is proposed. In the system, the position angle and the speed at a rotating condition are estimated basically by the model reference adaptive system (MRAS). At an initial or a starting condition, the position angle is estimated by a new AC current injection method. And at a lower speed region, the estimated position angle and the speed obtained from the MRAS are corrected with a new correcting technique.