Fixed switching angle control scheme for SRM drive

As the current shape of a switched reluctance motor (SRM) is of pulse type and changed by the motor parameters and drive conditions, the influences on the drive performances according to control method are more severe than other types of motors. In this paper, a fixed switching angle control scheme with flat-topped current is proposed and tested. It is derived from the conditions that the phase current of an SRM is to be flat-topped at various drive conditions, considering the saturation effect of magnetic circuit. Experimental tests are executed to verify the proposed excitation method. This drive system is easy to commutate, advantageous to reduce torque ripple, and appropriate for high efficiency drive