Finite element analysis of torque characteristics of field modulated magnetic gear system

A field modulated magnetic gear(FMMG) is a new magnetic drive. Its basic structure and working principle are analyzed, and its finite element model system is established using the software of Ansoft Maxwell in this paper. The changes of the output torque and the torque density along with the thickness of the air gap, the thickness of ferromagnetic pole pieces, the thickness of the permanent magnet, the number of pole pairs, the axial length of the system and eccentric distance are obtained.The results show that the eccentricity has little influence on the maximum output and the torque density, but other design parameters directly determine the maximum output and the torque density. These results will provide the basis for parameters optimization of FMMG system and the dynamic simulation of the system.