Torque Sharing Function Optimization for Extended Speed Range Control in Switched Reluctance Motor Drive

Torque sharing function (TSF) is an efficient torque ripple minimization approach in switched reluctance motor (SRM) drives in low and medium speed ranges. In this paper an optimized TSF is presented to enhance the torque profile of SRM over an extended speed range while maintaining an acceptable value of the average output torque. A secondary objective is to minimize the RMS phase current also included in the optimization problem. The control variables are the switch-on angle and the overlap angle. An improved version of the ant colony optimization (ACO) based procedure is employed in this work. Additionally, a highly trusted SRM model is built using finite element method (FEM), this model is then adopted by the optimizer to accurately select the optimal values of the control variables. Simulation is carried out on 4 kW, 1500 rpm, four-phase 8/6 SRM.