Phase plane-based variable structure control for switched reluctance motor direct torque control

A novel method is proposed to minimize the torque ripple of a switched reluctance motor (SRM) that is the first choice to be used in the electric vehicle. Based on the analysis of the phase plane of the flux linkage, the phase plane-based variable structure control (PPBVSC) is applied to preprocess the flux linkage deviation. On the other hand, an adjustable flux reference is used to replace the constant reference which is widely used in the conventional direct torque control (DTC). The improved control system overcomes the high torque ripple of the SRM during the commutation. Simulation results prove that the control scheme discussed in this paper reduces the torque ripple of the SRM greatly, and by which the torque ripple coefficient is only 0.041.