A torque control strategy for a two-phase switched reluctance motor based on dynamic ranking of voltage vectors

Abstract

Switched reluctance motor (SRM) suffers from high torque ripple which limits its application in many areas. In order to improve the control performances of SRM, a novel torque control strategy based on dynamic ranking of voltage vectors is developed in the paper. Multiple voltage vectors are selected as candidates at any control instant to enhance the control flexibility, and they are evaluated by a ranking process to determine their suitability to be finally applied to the power converter. The ranking evolves dynamically based on the prediction of motor output torque change rate, phase torque change rate, current change rate, and flux vector change at the next control instant. Several control rules are developed and finally the scheme is applied to a two-phase SRM. The control performances are analysed in the simulation which shows the validity of the proposed scheme.