设转轴部分与铁芯段具有相同的密度和泊松比，但弹性模量不同。考虑铁芯段的

It is assumed that the shaft part and the iron core section have the same density and Poisson's ratio, but the elastic modulus is different. Considering the simplification of the iron core section and the influence of its structure, material properties, quality and stiffness distribution, assembly relationship and other factors on the rotor structure, the equivalent elastic modulus of the iron core section is lower than that of the shaft, and is between the shaft’s Between the elastic modulus and the elastic modulus of the bar. The origin of the model's coordinate system is located at the midpoint of the end surface of the rotor output end (left end), and the x-axis points to the inner side of the rotating shaft along the rotor axis. Two kinds of displacement constraints are imposed on all nodes on the rotor axis, namely displacement along the axis (UX) and rotation displacement (ROTX) around the axis (ROTX); the fixed end of the bearing unit is given a full displacement constraint. According to this method, the finite element model of the traction motor rotor system of the EMU is established, and the physical shape is shown in Figure 1.

The shaft portion has the same density and Poisson ratio as the iron core segment, but the elastic mod is different. Considering the simplification of the iron core segment and the influence of its structure, material properties, mass and stiffness distribution, assembly relationship and other factors on the roter structure, the value of the equivalent elastic module of the iron core segment is lower than that of the shaft, between the elastic module of the shaft and the elastic module of the guide strip. The coordinate system origin of the model is located at the mid-point of the roor output (left) end face, with the x-axis pointing along the roor axis to the inside of the shaft. Apply two displacement constraints to all nodes on the roil axis, namely, moving displacement (UX) along the axis and rotating displacement around the axis (ROTX); Apply a full displacement constraint to the fixed end of the bearing unit. According to this method, a finite meta-model of the routing motor roth system of the locomotive group is established, and the solid shape is shown in Figure 1.

It is assumed that the rotating shaft has the same density and Poisson's ratio as the core section, but the elastic modulus is different. Considering the simplification of the core section and the influence of its structure, material properties, mass and stiffness distribution, assembly relationship and other factors on the rotor structure, the equivalent elastic modulus of the core section is lower than that of the shaft, which is between the elastic modulus of the shaft and that of the guide bar. The origin of the coordinate system of the model is located at the midpoint of the end face of the rotor output end (left end), and the X axis points to the inner side of the shaft along the rotor axis. Two kinds of displacement constraints are applied to all nodes on the rotor axis, namely, the displacement along the axis (UX) and the displacement around the axis (ROTx), and the complete displacement constraint is applied to the fixed end of the bearing unit. According to this method, the finite element model of EMU traction motor rotor system is established, and the solid shape is shown in Figure 1.