Electromagnetic-Temperature Coupling And Vibration Noise Analysis Of Permanent Magnet Synchronous Motor

With the gradual improvement of people’s material and cultural level and scientific and technological ability,the research on new energy is also deepening step by step,and permanent magnet synchronous motor is the main component of new energy motor,because of its advantages of high torque,high power and low noise,etc People are widely used in aviation,agriculture,automobile and so on,it is popular with people,but its performance is mainly determined by its temperature field performance and vibration and noise performance.In this paper,a 12-stage 45-slot permanent magnet synchronous motor is taken as an example to analyze the two-dimensional electromagnetic field based on the finite element analysis software ANSYS,and on the basis of the two-dimensional electromagnetic field analysis,the temperature field performance and vibration of the motor are further analyzed Study on Performance Analysis of Dynamic Noise.First,the two-dimensional model is established by using ANSYS Maxwell,the two-dimensional electromagnetic field is analyzed,the air gap magnetic density diagram is obtained,then the space-time characteristics of radial and tangential magnetic flux density and electromagnetic force in this case are analyzed and compared,and Fourier division is performed on it It is proved that the main causes of the permanent magnet synchronous motor vibration noise are radial force and low order harmonic,and the electromotive force of the three-phase motor is simulated to determine its influence on the temperature field.Secondly,the three heat source losses,core losses,winding copper losses and permanent magnet eddy current losses obtained from the simulation results of two-dimensional electromagnetic field are extracted,and the material and thermal conductivity of each component in this case are determined,and the third boundary condition is adopted,and the ANSYS Workbench pair is used The temperature field of the motor is analyzed,and the temperature distribution of the model is obtained.the results show that the temperature of the winding position is the highest,the core is the second,and the temperature of the rotor is lower.Then,the simplified three-dimensional model and the 1 m pie-shaped sound field model of the motor are obtained by using the three-dimensional mapping software,and the electromagnetic torque of the motor is calculated based on the simulation results of the two-dimensional electromagnetic field,and the excitation source is mapped to the harmonic of ANSYS Workbench In the response analysis module,the vibration velocity and vibration displacement in three different directions are analyzed,it is proved that the vibration of motor is mainly radial vibration,and it is also used as excitation source to be coupled into the noise analysis module,and the obtained sound pressure level diagram is analyzed The farther away the noise source is,the lower the noise is,and the experiment is carried out to verify the motor.Finally,based on the optimization analysis of the motor based on the angle of the chute,the temperature field and vibration noise characteristics after adding the angle of the chute are consistent with those given in the preceding article.it is found that the temperature distribution is reduced after the optimization,and the vibration noise is reduced.The situation has also improved.