Optimization and Experimental Analysis of a Segmented Rotor SRM of BSG for HEVs

Abstract

：To overcome the inherent defects of conventional switched reluctance motor (SRM), a new type of fault-tolerant segmented rotor SRM for the belt-driven starter generator (BSG) of HEVs is proposed, and then its electromagnetic characteristics are analyzed. Firstly, in order to improve the output torque of the new fault-tolerant segmented rotor SRM, the key structural parameters affecting the motor output torque are optimized, and the static and dynamic characteristics of the optimized motor are analyzed. Secondly, to study the fault-tolerant performance of the proposed motor, the characteristics of mutual inductance and fault tolerance features in case of a phase failure of the conventional SRM and fault-tolerant segmented rotor SRM are compared. Finally, an experimental prototype is designed and fabricated to verify the static characteristics. In addition, experimental studies on the prototype motor were carried out when it operated under the load operation. Both the simulated and experimental results reveal that the output torque of optimized fault-tolerant segmented rotor SRM was larger than that of the motor before optimization. Moreover, its dynamic and fault tolerance performances were better than those of the conventional SRM. Through the optimization and fault tolerance analysis of the fault-tolerant segmented rotor SRM, theoretical guidance for the design of BSG motors with safe and reliable characteristics is provided.