Design Optimization and Comparative Performance Analysis of a Novel Five-Phase Fault-Tolerant Spoke-Type Flux-Switching Permanent Magnet Motor for EV/HEV Applications

This research proposes a novel fault-tolerant spoke-type flux-switching permanent magnet (PFTST-FSPM) motor with a unique inverted T-shaped permanent magnet (PM) configuration for electric and hybrid electric vehicles. The study conducts a comparative analysis with a spoke-type interior permanent magnet (IPM) motor due to similarities. The focus is on critical parameters such as output torque, torque density, power density, and operating efficiency. A comparative analysis between the PFTST-FSPM motor and the conventional fault-tolerant spoke-type IPM (CFTST-IPM) motor is performed based on these criteria. The proposed motor aims to minimize torque ripple while maintaining optimal electromagnetic torque, torque density, power density, and efficiency performance metrics, thanks to the distinctive PM configuration, which also enhances its fault-tolerant capacity. To ensure a fair comparison, both motors share identical slot-pole combinations, winding arrangements, and stator/rotor dimensions, except for the unique PM configuration in the PFTST-FSPM motor. The design optimization employs response surface methodology (RSM) with barebones multi-objective particle swarm optimization (BB-MOPSO). The effectiveness of the method is validated by comparing electromagnetic performance before and after optimization using Finite Element Analysis (FEA) simulations. Results indicate superior output performance for the PFTST-FSPM motor compared to the CFTST-IPM motor. The accuracy of theoretical analyses is confirmed through experiments on a prototype of the proposed spoke-type FSPM motor.