Research On Motor Vibration Suppression Method Considering Magnetostrictive Effect

Not only is our daily life affected by the vibration and noise of the motor,but the life of the motor itself is also affected by it.Noise suppression is one of the important problems to be solved in the design and application of motor.The electromagnetic vibration noise is mainly caused by electromagnetic force and magnetostrictive force.This dissertation mainly studies the electromagnetic vibration noise of motor caused by magnetostrictive force and its suppression method.Firstly,the Jiles-Atherton model combined with quadratic magnetic domain rotation model is introduced into the constitutive model of the stator silicon steel sheet of the motor,and the numerical model of the magnetostrictive material is obtained.The magnetic field and mechanical field on the stator of the motor are analyzed by energy functional theory,and the electromagnetic-mechanical coupling of the motor is realized by combining the equations of stress and strain.Secondly,a numerical calculation model for electromagnetic-mechanical coupling of two-dimensional permanent magnet synchronous motor is established in finite element analysis software.The numerical simulation is used to analyze the influence of the magnetostrictive effect on the stress characteristics of the stator core silicon steel sheet in the rotating magnetic field.It is found that the magnetic density is relatively concentrated in the local magnetic path distortion,and the stress is concentrated on the top and root of the stator teeth.Then,according to the simulation ideas,an experiment is designed to measure the vibration signal of the motor stator core surface,and it is found that the maximum low frequency force wave frequency that affects the vibration of the rotary motor is power supply frequency.The vibration of the transformer core is measured by the same test method,and it is found that the maximum frequency of the low frequency force wave of the transformer core is two times the frequency of the power supply,however,obvious single power frequency wave is also found in the magnetic path where steering turns.In the design stage of the motor,the natural frequency of the motor stator is circumvented at the frequency of the maximum low-frequency force wave frequency,which can reduce the resonance of the motor and weaken the vibration caused by the magnetostrictive effect of the motor.Finally,a new method for suppressing the electromagnetic vibration of the motor caused by the magnetostrictive effect is proposed.In this method,the electromagnetic vibration caused by the positive magnetostriction effect on the stator silicon steel sheet of the motor is suppressed by filling the negative magnetostrictive material on the stator of the motor.In this dissertation,the accuracy of the method is verified by simulation,and the influence factors such as the shape,position,size and number of punching are analyzed.