Firstly, an accurate distribution of the magnetic field on rotor cross section is obtained by mean of FEM. Secondly, magnetic stress distribution on air/ core interfaces is obtained via a new formula considering the saturation effect, based on Maxwell Stress Method. 首先通过有限元计算得到转子横截面上磁场的精确分布,进而基于麦克斯韦应力方法,采用考虑饱和等多种因素影响的一个新的公式,获得了空气/铁心界面上的磁应力分布。