Research On Methods Of Suppressing Electromagnetic Vibration Of Permanent Magnet Synchronous Motor

Permanent magnet synchronous motors have the advantages of stable performance,simple structure,small size,high efficiency,and high torque output ratio.Therefore,permanent magnet synchronous motors have been widely used in defense,industry,aerospace,and daily life.There is a certain torque ripple in the permanent magnet synchronous motor during steady-state operation,which affects the life and control accuracy of the motor system.Therefore,research on how to weaken the torque ripple of the permanent magnet synchronous motor to suppress the electromagnetic vibration and noise of the motor has important practical significanceFirst,this paper uses Ansoft software to establish a two-dimensional finite element model of a permanent magnet synchronous motor,and simulates it to obtain the magnetic density cloud map,air gap flux density and electromagnetic force of the permanent magnet synchronous motor under parallel magnetization Distribution curve The electromagnetic force in the air gap of the permanent magnet synchronous motor is calculated by the Maxwell stress tensor method,and the Fourier transform is performed on the two to obtain the hannonic analysis chart and the spectrum analysis chart.The study found that the radial electromagnetic force of the permanent magnet synchronous motor is much larger than the tangential electromagnetic force,which is the main excitation source that causes the electromagnetic vibration noise of the motor.According to the equivalent surface current analysis method,the analytical calculation and analysis software for the air gap magnetic field of permanent magnet synchronous motors was compiled.The air-gap magnetic density finite element simulation results of the prototype are compared with the calculation results of the analytical method to verify the effectiveness of the analytical method.It has laid a theoretical foundation for the following research.Secondly,by analyzing the formation mechanism of cogging torque of permanent magnet synchronous motors,the influence of the pole arc coefficient and the structure of large and small poles on the cogging torque is considered.The air gap magnetic field of permanent magnet synchronous motor is modeled based on equivalent surface current method.The particle swarm optimization algorithm is used for multi-objective optimization design of the structural parameters of the permanent magnet synchronous motor,and the configuration method of the magnetic poles is used to reduce the order in which the air gap electromagnetic force harmonics have a greater influence on the torque ripple amplitude,thereby suppressing the motor The target of cogging torqueFinally,the finite element software was used to simulate the torque characteristics of the motor before and after the improvement,and the noise experiment analysis of the prototype before and after the improvement was carried out.It was verified that the magnetic pole structure can effectively suppress the cogging torque and reduce the vibration of the permanent magnet synchronous motor.Noise confirms the effectiveness of this optimization method and has important practical significance for improving the life and control accuracy of the motor system.