中文摘要：

针对一台传动比为-15/7的同轴式磁力齿轮试验样机存在转矩密度偏低的问题，运用二维有限元法分析调磁极片的径向齿高、相对齿宽、连接桥位置及内外磁体充磁方式、磁体体积对转矩密度的影响，从而来寻找提升转矩密度的措施。结果表明，在不增加制造成本的前提下，通过改进调磁极片和磁体的相关参数使转矩密度提升43%，磁力齿轮外径缩小7.5mm。

英文摘要：

For problem of low torque density existing in experimental prototype of coaxial magnetic gear with gear ratio of-15/7, 2D finite element method（FEM） are used to analyze influence of ferromagnetic pole-pieces（radial teeth height, relative teeth width and mechanical bridges connecting the modulator segments） and magnetization manners and volumeon torque density, to find improvement measures. The results show that the torque density can be increased by 43% and the outer diameter of coaxial magnetic gear can be decreased by 7.5mm due to the improved parameters of ferromagnetic pole-pieces and permanent magnet without increasing manufacturing costs.