Abstract
Manufacturing error and air-gap deformation are the most common cause of unbalanced magnetic pull force, which influence the stable operation of rotating machinery. In this paper, the characteristics of magnetic field and vibration in a permanent magnet synchronous motor were investigated through electromagnetic finite element simulations and laboratory measurements. The results of vibration acceleration and electromagnetic features measured in simulation and experiment were discussed by signal demodulation method. Based on virtual work principle, the distribution of unbalanced magnetic pull under different eccentric condition were obtained. Focusing on existence of coupling relationship between electromagnetic field and mechanical frame, the signal demodulation method based on principal component analysis was applied for extracting modulation features in experimental frame. It was found that the amplitude modulation of magnetic flux density and vibration acceleration signal enhanced. Nevertheless, the distribution of time-domain signal measured in experiment was different from that under weaken coupled condition, which could be caused by frame vibration. The aim of this paper is to reveal the modulation features of motor, which could provide engineering references for the fault diagnosis of a rotating machinery system.
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