Analytical method to optimise turn-on angle and turn-off angle for switched reluctance motor drives

A new analytical method is proposed to produce optimal turn-on and turn-off angles, based on a non-linear inductance model of low-inductance region for switched reluctance motor (SRM). The optimal turn-on angle is derived from the non-linear model and electrical equation of SRM instead of the linear model while optimal turn-off angle is derived from the turn-on angle and flux-linkage. Considering the back electromotive force, the proposed method has more accuracy than the conventional analytical method and improves the efficiencies both at low speed and high speed. Simulation and experimental results demonstrate the validity and effectiveness of the proposed method, which is suited for low- and high-speed conditions both.