实心转子铁心式永磁游标电机涡流损耗抑制研究

During the operation of the vernier permanent magnet machine(VPM)with solid rotor, the eddy current loss generated by the rotor core is much greater than that of a conventional permanent magnet machine. To solve this problem, the research was conducted on the mechanism of the eddy current loss caused by the solid rotor core, and a new rotor structure that can effectively reduce eddy current loss was proposed. Firstly, based on the magnetic field characteristics of VPM machines and the generation mechanism of eddy current loss, the traditional permanent magnet machine and the VPM machine(both rotor cores are made of solid steel)were compared. The results show that the rotor eddy current loss of the VPM machine was larger, and the causes of this phenomenon were analyzed. Then, a new VPM machine topology with grooved rotor was proposed, which can greatly reduce the eddy current loss while ensuring that the output torque almost maintains unchanged. Finally, the validity of the proposed structure was verified through 3D finite element calculation. The results show that the eddy current loss of the rotor core in a VPM machine with solid rotor is 26.85 times higher than that of a traditional permanent magnet motor. By using the proposed VPM machine topology, the rotor eddy current loss can be reduced by 67.2% while the output torque decreases by less than 5%. The research results provide a reference for the industrial application and promotion of VPM machines.