A Novel Flux-Reversal Permanent Magnet Machine with Low Torque Ripple Characteristic

The flux-reversal permanent magnet machine (FRPMM) exhibits superior energy conversion efficiency, enhanced fault resilience, and structural simplicity. It demonstrates excellent adaptability across variable speed conditions. Nevertheless, high torque ripple remains a primary constraint on the application prospects of FRPMMs. A novel FRPMM with concave stator poles and auxiliary teeth is proposed to address this issue. Sensitivity analysis is carried out, and the dominant parameters affecting the electromechanical characteristics of the machine are determined to be the rotor tooth radian, the permanent magnet tooth radian, and the auxiliary tooth width. Furthermore, the response surface method (RSM) is utilized in conjunction with a multi-objective genetic algorithm (MOGA) to optimize the parameters. Finally, a comparative analysis of electromagnetic characteristics between the proposed FRPMM and a conventional FRPMM is conducted. The results show that the proposed FRPMM can reduce torque ripple, improve output torque, and reduce the amount of permanent magnet.