Rotor eccentricity is a common fault of traction motors during operation. To ensure the stability and safety of the traction motor, it is essential to analyze the effect of rotor eccentricity on the dynamic performance of the traction motor, particularly the motor bearings. This study focuses on the extraction of the fault vibration features of a locomotive in the presence of rotor eccentricity under complex internal and external excitations from the traction power transmissions and wheel-rail interactions. A spatial locomotive-track coupled dynamics model with an eccentric rotor motor is applied in this study, and the detailed mechanical structures of the traction motor and motor bearings are comprehensively considered. The results indicate that rotor eccentricity can deteriorate the vibration conditions of the traction motor and intensify the interactions between the components of the motor bearings. Due to the effect of the time-varying mesh forces, the variation in the loaded region of the non-driving end bearing is more significant than that of the driving end bearing.
ZhangWMengGDiC, et al.Nonlinear dynamics of a rub-impact micro-rotor system with scale-dependent friction model. J Sound Vibration2008; 309(3–5): 756–777.
2.
OrmanMNowakAPintoCT. A novel non-invasive method for detection of static rotor eccentricity in an induction machine. In: International conference on measurement, information and control, Harbin, China, 16–18 August 2013. Proceedings of IEEE. 2013: 119–123.
3.
ZhangY. Research on the Major Faults Simulation of Traction Motor of HXD2 Electric locomotive. Master Thesis. Nanchang: East China Jiaotong University, 2017.
4.
WangJSunRRenM, et al.Nonlinear characteristics of rubbing rotor-bearing system of locomotive excited by rotating speed of the traction motor. IOP Conf Ser Earth Environ Sci2019; 242(3): 032054.
5.
SuiSWangKLingL, et al.Effect of wheel diameter difference on tread wear of freight wagons. Eng Fail Anal2021; 127: 105501. DOI: 10.1016/j.engfailanal.2021.105501.
6.
GargVDukkipatiR. Dynamics of Railway Vehicle Systems. Toronto: Academic Press, 1984.
7.
ZhaiWSunX. A detailed model for investigating vertical interaction between railway vehicle and track. Vehicle Syst Dyn1994; 23(S1): 603–615.
NielsenJCOIgelandA. Vertical dynamic interaction between train and track influence of wheel and track imperfections. J Sound Vibration1995; 187(5): 825–839.
10.
ChenZZhaiWWangK, et al.Dynamic investigation of a locomotive with effect of gear transmissions under tractive conditions. J Sound Vibration2017; 408: 220–233.
11.
ChenZZhaiWWangK. Vibration feature evolution of locomotive with tooth root crack propagation of gear transmission system. Mech Syst Signal Process2019; 115: 29–44.
12.
ChenZZhouZZhaiW, et al.Improved analytical calculation model of spur gear mesh excitations with tooth profile deviations. Mechanism Machine Theor2020; 149: 103838.
13.
WangZMeiGXiongQ, et al.Motor car-track spatial coupled dynamics model of a high-speed train with traction transmission systems. Mechanism Machine Theor2019; 137: 386–403.
14.
LiuYChenZZhaiW, et al.Dynamic investigation of traction motor bearing in a locomotive under excitation from track random geometry irregularity. Int J Rail Transportation2021; 10(1): 72–94. DOI: 10.1080/23248378.2020.1867658.
15.
LiuYChenZWangK, et al.Dynamic modelling of traction motor bearings in locomotive-track spatially coupled dynamics system. Vehicle Syst Dyn2021; 1–30. DOI: 10.1080/00423114.2021.1918728.
16.
LiuYChenZLiW, et al.Dynamic analysis of traction motor in a locomotive considering surface waviness on races of a motor bearing. Railway Eng Sci2021; 29(4): 379–393.
17.
ZhouZChenZSpiryaginM, et al.Dynamic performance of locomotive electric drive system under excitation from gear transmission and wheel-rail interaction. Vehicle Syst Dyn2021; 1–23. DOI: 10.1080/00423114.2021.1876887.
18.
GuoDChuFChenD. The unbalanced magnetic pull and its effects on vibration in a three-phase generator with eccentric rotor. J Sound Vibration2002; 254(2): 297–312.
19.
WuBSunWLiZ, et al.Circular whirling and stability due to unbalanced magnetic pull and eccentric force. J Sound Vibration2011; 330(21): 4949–4954.
20.
ZhouSZhuJXiaoQ, et al.Initial static eccentricity and gravity load on rotor orbit of EMU traction motor. J Mech Eng2020; 56(17): 145–154, (in Chinese).
21.
XiangCLiuFLiuH, et al.Nonlinear dynamic behaviors of permanent magnet synchronous motors in electric vehicles caused by unbalanced magnetic pull. J Sound Vibration2016; 371: 277–294.
22.
PalRMohantyA. A simplified dynamical model of mixed eccentricity fault in a three phase induction motor. IEEE Trans Ind Electronics2021; 68: 4341–4350.
23.
JonesAB. A general theory for elastically constrained ball and radial roller bearings under arbitrary load and speed conditions. J Basic Eng1960; 82: 309–320.
24.
HarrisTA. An analytical method to predict skidding in high speed roller bearings. ASLE Trans1966; 9(3): 229–241.
25.
HarshaSP. Nonlinear dynamic analysis of a high-speed rotor supported by rolling element bearings. J Sound Vibration2006; 290(1–2): 65–100.
26.
LiuJTangCShaoY. An innovative dynamic model for vibration analysis of a flexible roller bearing. Mechanism Machine Theor2019; 135: 27–39.
27.
LiuJShaoY. An improved analytical model for a lubricated roller bearing including a localized defect with different edge shapes. J Vibration Control2018; 24(17): 3894–3907.
28.
LiuYChenZTangL, et al.Skidding dynamic performance of rolling bearing with cage flexibility under accelerating conditions. Mech Syst Signal Process2021; 150: 107257.
29.
LiuYChenZHuaX, et al.Dynamic investigation of traction motor bearings considering rotor eccentricity in a locomotive. In: 2021 7th international conference on condition monitoring of machinery in non-stationary operations (CMMNO). Guangzhou, China, 11–13 June 2021, IEEE, pp. 19–22.
30.
LiuYChenZWangK, et al.Surface wear evolution of traction motor bearings in vibration environment of a locomotive during operation. Science China Technol Sci2021. DOI: 10.1007/s11431-021-1939-3.
31.
ChenZNingJWangK, et al.An improved dynamic model of spur gear transmission considering coupling effect between gear neighboring teeth. Nonlinear Dyn2021; 106(1): 339–357.
32.
NingJChenZWangY, et al.Vibration feature of spur gear transmission with non-uniform depth distribution of tooth root crack along tooth width. Eng Fail Anal2021; 129: 105713.
33.
WangJZhangJBaiR, et al.Nonlinear analysis of the locomotive traction system with rub-impact and nonlinear stiffness. Adv Mech Eng2018; 10(12): 1–11.
34.
ChapmanS. Electric Machinery Fundamentals. 4th edition.Tata McGraw-Hill Education, 2005.
35.
TenhunenA. Electromagnetic Forces Acting between the Stator and Eccentric Cage Rotor. Doctoral Thesis. Espoo: Helsinki University of Technology. 2003: 40.
36.
ZhaiW-M. Two simple fast integration methods for large-scale dynamic problems in engineering. Int J Numer Methods Eng1996; 39(24): 4199–4214.
