Analysis and Reduction of DC Winding Induced Voltage Pulsation in Five-Phase Non-Overlapped Stator Wound Field Flux Switching Machine

Abstract

DC winding induced voltage pulsation in Wound field flux switching (WFFS) machine is the main cause of the current ripples in DC winding. It may also deteriorates the DC power source and enhances the challenging issues to the control performances of the machine. Hence, reduction of this pulsation is very considerable parameter to analyze in WFFS machine's analysis. In this paper, DC winding induced voltage for five phase non overlapping stator WFFS machine is analyzed and reduced through various techniques. Three techniques i.e. rotor pole arc optimization, chamfering and rotor step skewing are analyzed and optimized to reduce the DC winding induced voltage. For optimization, krigging method based on genetic algorithm (GA) is performed due to compatibility with non-linear data and then results are verified by finite element (FE) analysis. By applying the chamfering and rotor pole arc optimization, 49.58% and 28.45% reduction in the peak to peak value of DC winding induced voltage pulsation is achieved and electromagnetic torque is maintained at 97.82% and 100% respectively while by applying the rotor skewing, 33.29% reduction in DC winding induced voltage pulsation is achieved and the torque is maintained at 98.37% for the five phase 10S-11P WFFS machine.