Chinese Journal of Mechanical Engineering >

2022 , Vol. 35 >Issue 5: 90 - 90

DOI: https://doi.org/10.1186/s10033-022-00762-9

Advanced Transportation Equipment

Improved Dynamics Model of Locomotive Traction Motor with Elasticity of Rotor Shaft and Supporting Bearings

  • Yuqing Liu ,
  • Zaigang Chen ,
  • Jieyu Ning ,
  • Kaiyun Wang ,
  • Wanming Zhai
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  • State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, 610031, China

收稿日期: 2021-10-20

  修回日期: 2022-04-25

  网络出版日期: 2023-04-24

基金资助

Supported by National Natural Science Foundation of China (Grant Nos. 52022083, 51775453, and 51735012).

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Improved Dynamics Model of Locomotive Traction Motor with Elasticity of Rotor Shaft and Supporting Bearings

  • Yuqing Liu ,
  • Zaigang Chen ,
  • Jieyu Ning ,
  • Kaiyun Wang ,
  • Wanming Zhai
Expand
  • State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, 610031, China

Received date: 2021-10-20

  Revised date: 2022-04-25

  Online published: 2023-04-24

Supported by

Supported by National Natural Science Foundation of China (Grant Nos. 52022083, 51775453, and 51735012).

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摘要

The locomotive traction motor is described as a rotor-bearing system coupling the kinetic equations of the traction shaft and its support bearings with the determination of their elastic deformations in this study. Under the effect of excitations induced by the dynamic rotor eccentric distance and time-varying mesh stiffness, the elastic structure deformations of the shaft and support bearings are formulated in the vibration environment of the locomotive. In addition, the nonlinear contact forces between the components of the rolling bearing, the lubricating oil film, and radial clearance are comprehensively considered in this study. The results indicate that the elastic deformations of the shaft and bearings can change the dynamic responses of the traction motor and its support bearings. There are large differences between the ranges of the rotor motion calculated by the rigid and the flexible traction motor models when the intensified wheel-rail interaction is considered. With the increase of the rotor eccentricity, the results underscore the role of the elasticity of traction shaft and support bearings in dynamic researches of the traction motor. The critical value of the initial eccentric distance for the rub-impact phenomenon decreases from 1.23 mm to 1.15 mm considering the flexible effect of the shaft and bearings. This dynamics model of the traction motor can provide more accurate and reasonable simulation results for correlational dynamic researches.

关键词： Traction motor; Bearing; Gear mesh; Vehicle-track coupled dynamics

本文引用格式

Yuqing Liu , Zaigang Chen , Jieyu Ning , Kaiyun Wang , Wanming Zhai . Improved Dynamics Model of Locomotive Traction Motor with Elasticity of Rotor Shaft and Supporting Bearings[J]. Chinese Journal of Mechanical Engineering, 2022 , 35(5) : 90 -90 . DOI: 10.1186/s10033-022-00762-9

Abstract

The locomotive traction motor is described as a rotor-bearing system coupling the kinetic equations of the traction shaft and its support bearings with the determination of their elastic deformations in this study. Under the effect of excitations induced by the dynamic rotor eccentric distance and time-varying mesh stiffness, the elastic structure deformations of the shaft and support bearings are formulated in the vibration environment of the locomotive. In addition, the nonlinear contact forces between the components of the rolling bearing, the lubricating oil film, and radial clearance are comprehensively considered in this study. The results indicate that the elastic deformations of the shaft and bearings can change the dynamic responses of the traction motor and its support bearings. There are large differences between the ranges of the rotor motion calculated by the rigid and the flexible traction motor models when the intensified wheel-rail interaction is considered. With the increase of the rotor eccentricity, the results underscore the role of the elasticity of traction shaft and support bearings in dynamic researches of the traction motor. The critical value of the initial eccentric distance for the rub-impact phenomenon decreases from 1.23 mm to 1.15 mm considering the flexible effect of the shaft and bearings. This dynamics model of the traction motor can provide more accurate and reasonable simulation results for correlational dynamic researches.

Key words： Traction motor; Bearing; Gear mesh; Vehicle-track coupled dynamics

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