Research On Structural Vibration Suppression Technology With Considering Of Magnetostriction

Magnetostriction is a property of ferromagnetic materials that causes them to change their dimensions at the direction of magnetic induction line during the process of magnetization.And it is the cause of ferromagnetic materials vibration.Because of the widely using of ferromagnetic materials,such as driving motor in electrical system,transformer,electric vehicle and so on,it’s of great research value to study on the vibration of transformer and brushless direct current motor with considering of magnetostriction.Main points of this paper are as follows:A brief introduction of magnetostriction and measuring system is performed at first.And then,A FEA model of magnetostriction force by using of energy equation is put forward.In this model,reluctivity is the function of the element stress which shows the coupling of magnetic field and stress field.Finally,we get the dynamic model of transformer using magnetostriction force as external force.Multi-field coupling analysis of voltage stabilizing transformer is conducted at this part by using of COMSOL Multiphysics.By making the operating circuit as input and load,simulation results of current,magnetic field and surface acceleration of voltage stabilizing transformer in working condition is conducted.Also a test on the surface acceleration of transformer by using of vibration measuring system is performed in this part.On the base of former result,an isolation mounting which consist of spring and rubber blanket is designed to study on active vibration isolation of voltage stabilizing transformer and experimental measurement of dynamic force pre and post the isolation mounting get equipped is performed.Then a vibration suppression method by adjusting the turns of primary coil and the dimension of central column with considering of the effect of magnetostriction is put forward.The vibration of BLDC with considering of magnetostriction is analyzed.We get the result of stator about magnetic field,displacement field and their spectrum results and make compare of weather considering magnetostriction about the vibration of stator.