Nonlinear dynamic behaviors of permanent magnet synchronous motors in electric vehicles caused by unbalanced magnetic pull
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- 作者：Changle Xiang ; Feng Liu ; lflhj2009@163.com" class="auth_mail" title="E-mail the corresponding author ; Hui Liu ; Lijin Han ; Xun Zhang
- 关键词：Unbalanced magnetic pull ; Multiple equilibrium points ; Amplitude modulation effects ; Dynamic eccentricity ; Frequency characteristics ; Stability
- 刊名：Journal of Sound and Vibration
- 出版年：2016
- 出版时间：9 June 2016
- 年：2016
- 卷：371
- 期：Complete
- 页码：277-294
- 全文大小：2123 K
文摘
Unbalanced magnetic pull (UMP) plays a key role in nonlinear dynamic behaviors of permanent magnet synchronous motors (PMSM) in electric vehicles. Based on Jeffcott rotor model, the stiffness characteristics of the rotor system of the PMSM are analyzed and the nonlinear dynamic behaviors influenced by UMP are investigated. In free vibration study, eigenvalue-based stability analysis for multiple equilibrium points is performed which offers an insight in system stiffness. Amplitude modulation effects are discovered of which the mechanism is explained and the period of modulating signal is carried out by phase analysis and averaging method. The analysis indicates that the effects are caused by the interaction of the initial phases of forward and backward whirling motions. In forced vibration study, considering dynamic eccentricity, frequency characteristics revealing softening type are obtained by harmonic balance method, and the stability of periodic solution is investigated by Routh–Hurwitz criterion. The frequency characteristics analysis indicates that the response amplitude is limited in the range between the amplitudes of the two kinds of equilibrium points. In the vicinity of the continuum of equilibrium points, the system hardly provides resistance to bending, and hence external disturbances easily cause loss of stability. It is useful for the design of the PMSM with high stability and low vibration and acoustic noise.