Research on Electromagnetic Vibration Characteristics of a Permanent Magnet Synchronous Motor Based on Multi-Physical Field Coupling

Abstract

Background and Purpose: The stator vibration characteristics are comprehensively mastered by considering the influence of winding and the housing structure on the stator modes. This effect is neglected in the research field of electromagnetic vibration of permanent magnet synchronous motors (PMSMs). Methods: The radial air-gap flux density equations and PMSM’s electromagnetic force density are derived, and then the harmonic characteristics of electromagnetic force density are studied. An equivalent finite element model of the stator is proposed that investigates the impacts of the winding and stator housing rules on the stator modal frequency. Finally, the harmonic response and acoustic analyses of electromagnetic vibration are carried out based on multi-physics field coupling. Results: The equivalent radiated power distribution laws and acoustic field of motor electromagnetic vibration under transient operating conditions are obtained. The theoretical analysis results are consistent with the experimental results. Conclusion: The obtained results show that the spatial order of the radial electromagnetic force is not equal to the order of the radial mode of the motor stator. The reason for this is that structural resonance is induced when the frequency components of the spatial radial electromagnetic force are coupled with the intrinsic frequency of the stator.

Sideband Vibro-Acoustics Suppression and Numerical Prediction of Permanent Magnet Synchronous Motor Based on Markov Chain Random Carrier Frequency Modulation

“…The structural characteristics of the motor have a large impact on its vibration noise. Resonance occurs when the frequency of electromagnetic force closely matches the natural frequency, which in turn worsens the NVH performance of the motor [31]. In this paper, finite element analysis is performed in JMAG to obtain the modal parameters of the prototype.…”

Simulation and Experiment Analysis of Driveshaft

“…In this study, the mass of the transmission shaft is unchanged, and the natural frequency and mode of each order under different stiffness are studied by analytical calculation in the simulation model. For an approximately cylindrical driveshaft, the M-order circumferential natural frequency can be expressed as [21]:…”

Electromagnetic force analysis of permanent magnet synchronous motors based on rotor magnetic barrier structure optimization

“…Moreover, higher-order electromagnetic forces with frequencies close to the motor's natural frequency were found to be susceptible to resonance, intensifying vibration noise. Reference [5] revealed that a mismatch in the spatial order of radial electromagnetic forces and the order of stator modes may lead to resonance-induced vibration noise due to the proximity of the electromagnetic force frequency to the stator's natural frequency. While these studies have elucidated the reasons behind the generation of vibration noise from radial electromagnetic forces, specific strategies for mitigating vibration noise have not been explicitly proposed.…”