Electromagnetic And Vibration Analysis Ofsingle-phase Self-starting Permanent Magnet Synchronous Motor

Since modern times,permanent magnet motors have been widely used in daily life and production.Single-phase permanent magnet synchronous motor,as one of permanent magnet motors,has certain advantages in the field of small and mediumsized household appliances by virtue of its simple structure,reliable operation,long service life,easy maintenance and low price.At the same time,the motor adopts asymmetric air gap structure and can realize self-starting without relying on external equipment.However,the asymmetric structure of the motor makes the motor produce larger vibration and noise during operation.Vibration and noise on the motor itself will cause motor fatigue,shortened service life,for the user will be harmful to health,so the study of single-phase permanent magnet synchronous motor vibration and noise has certain practical significance.This paper mainly studies and analyzes the mechanism of vibration noise of low-power permanent magnet synchronous motor.On the basis of existing motor structure,considering the influence of motor axial direction,the magnetic field distribution of motor is analyzed.Calculation and analysis of motor vibration noise are carried out.First,this paper expounds the basic structure and operating principle of singlephase permanent magnet synchronous motor,motor three-dimensional entity model is set up,using the finite element method to calculate the three-dimensional electromagnetic field of the motor,considering the effect of motor axial direction and end,getting magnetic field distribution at different axial positions of the motor end and middle,calculation the air gap flux density in stator inner side.Secondly,combining with maxwell's stress equation,the change of electromagnetic force at different positions along the axis of the motor was calculated,so as to obtain the change rule of electromechanical magnetic force in time and space,and analyze the influence of motor axial length on electromagnetic force.Again,combination of Ansys and Ansys Workbench software,extracting the electromagnetic force and apply it into the motor stator inner side as the excitation source,changes of electromagnetic force along the axial direction corresponds to the 3D electromagnetic field,further studies the vibration characteristics of motor,and making the transient dynamics analysis,the vibration deformation of motor is analyzed after considering the change of axial electromagnetic force.Finally,LMS virtual.Lab software was used to load the vibration data obtained through transient dynamic analysis into the 3D model as the excitation source,and the radiated noise of the motor was simulated and analyzed through acoustic boundary element method,so as to obtain the variation characteristics of electromagnetic noise when considering the axial length of the motor.This paper further improves the analysis of single-phase permanent magnet synchronous motor and provides a basis for future design and optimization.