An accurate estimation method for position angles of salient-pole brushless DC motor

In this paper, an accurate position estimation method is reported for salient-pole brushless dc motor drives or permanent magnetic synchronous motor drives. The method is proposed for obtaining the position angles, the accuracy of which affect the operation of the switching devices of the inverter that drives the motor. First, the method for estimating the position angle is proposed. Secondly, the accuracy and the robustness of the method are studied. The experimental results show that the estimated position angles are estimated precisely at the standstill condition.