Rotor Saliency Optimization for High-Power Density Wound-Field Flux-Switching Machines

초록

This paper conducts a rotor saliency optimization to enhance the electromagnetic performance of a wound-field flux-switching machine (WFFSM). The WFFSM comprises two sets of windings, namely field and armature windings, on the stator. Having both windings on the stator creates inefficient magnetic flux paths that do not directly contribute the electromagnetic torque generation. Therefore, the main objective of this paper is to design a rotor structure that facilitates an optimal magnetic flux path, leading to high and smooth torque generation. The study extensively analyzes how the rotor geometry affects the terminal voltage and torque characteristics. As a result of the optimization, the terminal voltage total harmonic distortion (THD) decreases significantly from 0.46 to 0.11, and there is an impressive 89% reduction in self-inductance spikes. By incorporating an advanced cooling system and employing higher current density levels, the optimized WFFSM achieves a torque level comparable to 97% of the baseline flux-switching PM machine (FSPMM). While the FSPMM exhibits superior efficiency in the constant torque region, the WFFSM's unique field regulation capability allows it to maintain better efficiency in the constant power region. © 2023 IEEE.

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