Vibration characterization of permanent magnet synchronous motor considering stator assembly anisotropy
The current challenges in establishing motor noise and vibration analysis models include the complex structure of insulating paint and winding conductors,as well as the difficulty in determining material parameters.To address these issues,a high-precision equivalent modeling method combined with genetic algorithm optimization for fast correction of material parameters is proposed.A response surface model based on Central Composite Design(CCD)is used to analyze the influence of anisotro-pic material parameters on modal frequencies.The vibration distribution characteristics of the motor's shell and rear end cover under rated working conditions are analyzed through multi-physics field coupled simulations.The accuracy of the multi-physics field analysis model is validated through vibration bench tests,and the mechanism for generating the peak value of the 48th-order equivalent radiated power level near 8 000 r/min is explored.The results show that among the anisotropic materials,the elastic modulus of the insulating material contributes the most to the motor's modal behavior.The rela-tive error between the corrected finite element modal frequencies for the motor and the modal test results using the hammering method for the first three orders of the motor is within 3.5%.The equivalent mod-eling and correction method can be applied to construct multi-physics field coupled models for motors.Overall,the multi-physics simulation results show good consistency with the experimental results.The 48th-order overall vibration level is the highest,with the peak primarily caused by the resonance be-tween the 0th-order 12x frequency excitation of the radial electromagnetic force and the 0th-order modal frequency(6 239 Hz)of the stator assembly at a rotational speed of 8 000 r/min.This study can provide a reference for investigating the motor's noise and vibration distribution characteristics and generation mechanisms.
万方数据
维普
