Abstract
Rotor eccentricity is a common fault in permanent magnet synchronous motors. Its effect on the vibration and noise is thoroughly investigated in this paper. The additional force harmonics due to static eccentricity and dynamic eccentricity are firstly derived with the rotational direction of force harmonics into consideration. A finite element model is built to calculate the force and two dimensional fast Fourier transform is employed to obtain the space and frequency orders under different types of eccentricity. Then, a multiphysics model is established to predict the vibration and acoustic noise under different eccentricity types and levels. Finally, the conclusions drawn from the analytical and simulation results are partly validated by experimental test. It is found that rotor eccentricity greatly intensifies the vibration and noise due to the induced force harmonics with lower space orders. Dominant vibration and noise peaks would transfer to the frequency band in the vicinity of the lower modal frequency when eccentricity occurs.
Highlights
The vibration and noise problem of permanent magnet synchronous motors (PMSMs), especially which results from electromagnetic force, has been a hot topic in recent years
A commonly used method to consider the eccentricity is by introducing the correction factor, which is employed to study the force harmonics induced by different types of rotor eccentricity in [7,8,9]
A multiphysics model is proposed to investigate the influence of rotor eccentricity on electromagnetic force, vibration and noise of PMSMs
Summary
The vibration and noise problem of permanent magnet synchronous motors (PMSMs), especially which results from electromagnetic force, has been a hot topic in recent years. 2-D analysis instead of 1-D analysis should be adopted to get the frequency of the force harmonic with the specific space order It will be revealed in this research that the effect from the eccentricity depends on the rotational direction of the induced force harmonics, which has been seldom discussed. Field reconstruction method is used in [13] to discuss the effect of SE on a PMSM and it is found that the overall sound power level increases by 26 dB when 40 % SE occurs. It is concluded from the above two researches that the rotor eccentricity has a great impact on the noise. An experimental test is conducted to validate some analytical and simulation results
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