期刊
APPLIED SCIENCES-BASEL
卷 8, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/app8010113
关键词
PMSM; unbalanced magnetic pull; nonlinear vibration; offset rotor bearing system; gyroscopic effect; coupling effects
类别
资金
- National Natural Science Foundation of China [51675091]
- Collaborative Innovation Center of Major Machine Manufacturing in Liaoning, the Major Scientific and Technological Innovation Project of Liaoning Province [201506003]
The vibration and noise of permanent magnet synchronous motors (PMSM) are mainly caused by unbalanced magnetic pull (UMP). This paper aims to investigate nonlinear vibration in PMSMs. Firstly, the analytical model of the air-gap magnetic field with an eccentric rotor in PMSM is studied, and the analytical model is verified by the finite element method. Then the dynamic model of an offset rotor-bearing system is established, and the gyroscopic effect, nonlinear bearing force and UMP are taken into consideration. Finally, the dynamic characteristics of different static displacement eccentricities, rotor offsets and radial clearances are investigated in both the time domain and the frequency domain. The results show that the amplitudes of dynamic responses increase with the static displacement eccentricity and rotor offset and high integer multiples of rotating frequency appear with the increase of displacement eccentricity. The coupling effects of bearing force, unbalanced mass force and UMP are observed in the frequency domain, and the frequency components in the dynamic responses indicate that the bearings have an effect on the system.
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