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Analysis of Electromagnetic Vibration of Permanent Magnet Synchronous Motor under Static and Dynamic Eccentricity Fault

In order to study the influence of different eccentricity on the electromagnetic vibration of permanent magnet synchronous motor (PMSM), this paper takes a 48-slot 8-pole interior PMSM for electric vehicle as an example, establishes an analytical analysis model of radial electromagnetic force, and analyzes the variation laws of spatial order and time frequency of electromagnetic force under static and dynamic eccentric respectively. The differences between the effects of static and dynamic eccentricity on the electromagnetic vibration of the motor under different eccentricities are compared. The results show that with the increase of eccentricity, both static and dynamic eccentricity will aggravate the electromagnetic vibration of the motor. Static eccentricity will aggravate the electromagnetic vibration corresponding to the original vibration frequencies, but will not produce the new vibration frequencies. While dynamic eccentricity has little effect on the electromagnetic vibration at the original vibration frequencies, but introduces some new vibration frequencies, and the new frequencies are more likely to cause motor resonance.