关键词: 3D有限元分析, 轴向充磁磁齿轮, 聚磁式轴向磁齿轮, Halbach式轴向磁齿轮

Abstract: According to the magnetization direction and arrangement of permanent magnets, axial magnetic gears can be divided into the axial flux magnetic gear (AFMG),the axial flux focusing magnetic gear (AFFMG) and the axial magnetic gear with Halbach permanent magnet arrays (HAMG).3D finite element method was used to compare magnetic field,torque characteristics and axial force of three axial magnetic gears.Based on the harmonic analysis of magnetic field in the air gap,the torque and axial force generated by magnetic harmonics were calculated by formulas,and the effects of magnetic harmonics on the torque transmission and the axial force were clarified.The comparison demonstrates that the torque capability and permanent magnet utilization efficiency of the AFFMG is largest,which shows a 17.5% and 32.6% growth over the AFMG,and 2% and 15.1% growth over the HAMG.The HAMG has the smallest torque ripple because the amplitudes of magnetic harmonics causing torque ripple in the air-gaps are minimal.The low speed rotor of the AFMG has the lowest axial force,38.3% smaller than the AFFMG,and 32.7% smaller than the HAMG.