Flux switching permanent magnet (FSPM) machines with odd rotor teeth exhibits significant vibration caused by the unbalanced magnetic force (UMF). This paper proposes a stator axial partitioned FSPM (SAP-FSPM) machine, which can effectively eliminate the UMF, and introduces the UMF suppression principle for the first time. Moreover, the harmonic characteristics of the SAP-FSPM are utilized to achieve rapid optimization. Initially, the UMF suppression mechanism in SAP-FSPM is investigated using magnetic field modulation theory. Subsequently, by analyzing the harmonic components of air gap flux density, cogging torque, and back electromotive force (EMF) of both the SAP-FSPM machine and its two modular parts, we show that these harmonic components either cancel out or superimpose. Based on the above analysis, a method of harmonic optimization for one of the modular parts is proposed to optimize the SAP-FSPM, which transforms the 3D optimization problem into 2D, overcoming the time-consuming nature of traditional 3D optimization. The finite element (FE) simulation shows the effectiveness of the proposed optimization method. Finally, a prototype was fabricated for comparison and validation with the conventional FSPM machine.
Li et al. (Tue,) studied this question.