Sarshar, Mohammad Reza; Jalali Kondelaji, Mohammad Amin; Asef, Pedram; Mirsalim, Mojtaba; (2025) New Multi-Tooth Inter-Modular Flux Reversal Permanent Magnet Motor. In: Proceedings of the 7th International Electric Vehicle Technology Conference (EVTeC 2025). Japanese Society of Automove Engineering (JSAE): Yokohama, Japan. (In press).

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Abstract

This paper offers a new motor topology, multi-tooth inter-modular flux reversal permanent magnet (FRPM) motor, in which the PMs are positioned between the teeth of stator’s wound pole (tooth PMs) and between the stator modules (inter-modular PMs). By using the motor's magnetic equivalent circuit, it is reported that the tooth PMs reduce the stator pole flux density while increasing the air-gap flux density. The motor specifications including dimensions are obtained by a multi-objective optimization using genetic algorithm. Two-dimensional finite element analysis is used to achieve the main operating characteristics in terms of flux density distributions, back-EMF, output torque, overload performance, and efficiency maps. Two benchmark inter-modular PM (IMPM) motors are studied as comparison criterion to highlight the achievements of the promising new motor topology. It is shown that the new structure improves the average torque by almost 45% compared to the benchmark IMPM while decreasing PM volume. Also, by examining the efficiency maps, the new motor topology indicates a 3.5 times larger high-efficiency area than its benchmark counterparts.

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