根据实际牵引电机转子的结构，对其进行简化。将铁芯视为一个圆柱，同时需考

According to the actual structure of the rotor of the traction motor, it is simplified. Regarding the iron core as a cylinder, it is necessary to consider the influence of the two end rings of the rotor and the holes of the rotor on the quality characteristics of the iron core. Then consider the rotor shaft, iron core, and guide bar as a whole, ignoring the assembly relationship between the three. The rotor is supported by two bearings and rotates at a constant speed. The traction motor rotor system model is established on the ANSYS platform (ANSYS, USA) [12, 13]. The element model used includes beam elements and spring-damped bearing elements. The rotor structure (rotating shaft and iron core) is established by beam elements, and the nodes are all on the axis of the rotor. The rotor bearing is simulated by a spring-damped bearing unit, only the contact stiffness is considered without considering the contact damping, and the bearing contact stiffness value is regarded as a constant [14].

According to the structure of the actual traction motor role, it is simplified. The core is considered to be a cylinder, taking into account the effect of the two end rings of the roteer and the holes in the roteer on the quality characteristics of the core. Then the rot's shaft, iron core, guide bar as a whole, ignoring the assembly relationship between the three. The rot is supported by two bearings and rotates at a constant speed. A model of the roon system for traction motors is established in the ANSYS platform (ANSYS, USA). The unit model used includes the beam unit and the spring-damping bearing unit. The roth structure (axis and iron core) is built by the beam unit, and its nodes are on the axis of the rot. Roor bearings are simulated by a spring-damping bearing unit, taking into account only their contact stiffness and not contact damping, and treating the bearing contact stiffness value as a constant.

According to the actual structure of traction motor rotor, it is simplified. The iron core is regarded as a cylinder, and the influence of the two end rings and the holes of the rotor on the quality characteristics of the iron core should be considered. Then the rotor shaft, iron core and guide bar are regarded as a whole, and the assembly relationship among them is ignored. The rotor is supported by two bearings and rotates at a constant speed. The rotor system model of traction motor is established in ANSYS platform (ANSYS company, USA) [12,13]. The element models used include beam element and spring damper bearing element. The rotor structure (shaft and core) is established by beam element, and its nodes are on the axis of the rotor. The rotor bearing is simulated by a spring damper bearing unit, and only its contact stiffness is considered without considering the contact damping, and the value of bearing contact stiffness is regarded as a constant [14].