New model based predictive torque control algorithm in combination with duty ratio modulation strategy for flux-switching permanent magnet synchronous machines

During the past five years, flux-switching permanent magnet synchronous machines (FSPMSMs) have began to find potential applications for electric vehicle, wind generation, etc. for their high torque density, great thermal dissipation ability, strong mechanical robustness, etc. Unfortunately, FSPMSMs compared to traditional rotor-inserted PMSMs suffer greater magnetic saturation and torque ripple for its inherited double salient structure, and higher converter switching loss due to its higher number of pole pairs. Besides electromagnetic optimal design, model based predictive torque control (MPTC) is one effective method to improve the FSPMSM drive performance. On the basis of the authors´ past work, this paper continues to employ the duty cycle modulation the MPTC algorithm. By the help of one comprehensive cost-function modification, the torque and flux ripples of FSPMSM are reduced obviously.