Influence of unbalanced magnetic pull on rub-impact rotor-bearing system

被引：0

作者：

Zhao D. ^{[1
]}

Dang W. ^{[1
]}

Sun W. ^{[1
]}

Guo P. ^{[1
]}

机构：

[1] State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an

来源：

Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | 2019年 / 47卷 / 10期

关键词：

Electromagnetic stiffness; Rotor-bearing system; Rub-impact; Static eccentricity; Unbalanced magnetic pull;

D O I：

10.13245/j.hust.191007

中图分类号：

学科分类号：

摘要：

Aiming at the problem of vibration caused by unbalanced magnetic pull (UMP) when both dynamic eccentricity and static eccentricity appear in rotor-bearing system, the expression of UMP considering two kinds of air-gap eccentricities was derived from the energy of air-gap magnetic field and expressed as the form of electromagnetic stiffness. Non-linear dynamic equation of rub-impact rotor-bearing system under UMP was established through Lagrange equation, the differential equation was solved by using the fourth-order Runge-Kutta method and the bifurcation diagram, cascade spectrum of rotor were obtained simultaneously. The effects of electromagnetic stiffness, system speed, initial gap and static eccentricity on the vibration characteristics of rotor-bearing system were analyzed. Research results show that rub-impact and oil whirl are delayed because of the existence of electromagnetic stiffness, which is beneficial to the stable operation of system in the middle and low speed region;quasi-periodic and double-periodic alternately appear in the system during the change of initial gap and static eccentricity, and the amplitude of rotor increases with the increase of static eccentricity. © 2019, Editorial Board of Journal of Huazhong University of Science and Technology. All right reserved.

引用

页码：34 / 39

页数：5

共 4 条

[1] Xiang C., Liu F., Liu H., Et al., Nonlinear dynamic behaviors of permanent magnet synchronous motors in electric vehicles caused by unbalanced magnetic pull, Journal of Sound and Vibration, 371, pp. 277-294, (2016)
[2] Han X., Palazzolo A., Unstable force analysis for induction motor eccentricity, Journal of Sound and Vibration, 370, pp. 230-258, (2016)
[3] Yan D.L., Wang W.Y., Chen Q.J., Fractional-order modeling and dynamic analyses of a bending-torsional coupling generator rotor shaft system with multiple faults, Journal of Sound and Vibration, 110, pp. 1-15, (2018)
[4] Sun W.P., Yan Z.M., Nonlinear characterization of the rotor-bearing system with the oil-film and unbalance forces considering the effect of the oil-film temperature, Nonlinear Dynamics, 92, 3, pp. 1119-1145, (2018)

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