A Multi-Tooth Interactive Flux ReversalPermanent Magnet Motor

This article proposes a novel multi-tooth interactive flux reversal permanent magnet (IFRPM) motor. The innovative motor design incorporates both tooth and yoke PMs, providing both flux reversal (FR) and biased flux (BF) effects, respectively. The former directly contributes to torque production and an increase in air-gap flux density, while resulting in a decrease in stator-pole flux. Using flux modulation theory (FMT), the influence of each harmonic on the torque generation is analyzed. The motor’s dimensions are optimized using a genetic algorithm to achieve the maximum torque while minimizing the torque ripple. Four benchmark motors two with FR effect and two with BF effect-are used for comparison. The findings underscore the superior performance of the IFRPM. First, the IFRPM reduces saturation levels compared to BF motors. Additionally, a torque quality factor (TQF) is introduced, which considers the average torque, torque ripple, and PM volume, providing a fair evaluation. The IFRPM achieves a 669% and 95% improvement in TQF over recent FRPMs of similar size, respectively. It offers at least a 318% higher TQF than BF motors. Furthermore, the IFRPM exhibits the lowest torque ripple in overload conditions. Finally, the motor is prototyped and experimentally validated.