Copper Loss Reduction of Torque Sharing Function in Switched Reluctance Motor by Division of Commutation Region

Torque sharing function (TSF) method is widely used in switched reluctance motor (SRM) drive to reduce the torque ripple. Besides maintaining the torque control performance, the copper loss reduction should also be considered while determining the TSF profiles. In this paper, an improved TSF method modified from the previous method recently done by the other research group is proposed focusing on the optimal allocation of torque component in the commutation phases and reduction of copper loss. Based on the torque generating nature of SRM, the commutation region is suggested to be divided into two regions where the incoming phase and outgoing phase have different torque generating capacity. The commutation phase with higher rate of change of inductance with respect to the rotor position is preferred to mainly contribute to the torque production while the other phase is penalized to have reduced current. Thus, the total copper loss can be reduced. Simulation is carried out in MATLAB/Simulink environment and the simulation results show that the modified TSF with region division has a lower copper loss compared to the previous method done by the other research group.