Modal Analysis of Stator for Motor System with Large Distributed Magnetic Bearings

doi:10.3901/JME.2016.08.001

Abstract

Abstract: Accurate analysis of the stator modal shapes and natural frequencies is very important for reducing acoustic noise and vibration of electrical machine. The stator mode of motor based on large distributedmagnetic bearings(MB) is studied by finite element method(FEM). Effects of axial MB windings, radial MB laminations, mounting feet, and additional mass on stator natural frequencies are investigated. The results show thatStator windings have great effects on natural frequencies of axial MB, and those are suitable dealt with mass into stator cores. Less impact of stator laminations on the natural frequencies of radial MB, those can be dealt as isotropic structure. Bolt joint has some influence on natural frequencies of stator. But when the connection is much greater than the shell stiffness, the connection stiffness has little effect on natural frequencies. Additional mass can make difference to natural frequencies, and the effects of the frequencies vary with different modal shapes. The calculation results of machine’s 12 modes are validated against experimental results.

Key words: finite element method, magnetic bearing, modal analysis, modal shape, motor, natural frequency

CLC Number:

TH133

ZHANG Xianbiao, WANG Dong, SU Zhenzhong. Modal Analysis of Stator for Motor System with Large Distributed Magnetic Bearings[J]. Journal of Mechanical Engineering, 2016, 52(8): 1-7.

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