Finite Element Simulation Of PMSM Based On Field-circuit Coupled And Experimental Verification

Permanent magnet synchronous motor(PMSM)is widely used as a drive motor in electric vehicles because of its high power density and high efficiency.However,due to the limitations of electric vehicles on the operating environment and installation space of the motor,the internal heat dissipation conditions of the motor are very poor,and there is a serious problem of heat generation inside the motor.To solve the problem of motor temperature rise,it is necessary to accurately calculate the internal loss and temperature field of the motor.This paper uses finite element analysis software to build the simulation model and control circuit model of permanent magnet synchronous motor,and uses MATLAB/Simulink to build the control strategy of the motor.The field-circuit coupling method is adopted to simultaneously consider the influence of the motor body and control strategy on the motor temperature field and loss.The main work is as follows:1.Establish the field-circuit coupling model of the PMSM.First,the finite element analysis software ANSYS Maxwell is used to build a 2-D model of the PMSM,and the basic parameters of the motor are calculated as the initial parameters of the motor control strategy.The performance of the motor material will change with the change of the internal temperature of the motor.Therefore,the influence of temperature must be considered when setting the motor material.Then,use ANSYS Simplorer to build the inverter circuit model of the motor as the external circuit of the motor;at the same time,build a motor control strategy in MATLAB/Simulink to control the switching signals of the IGBT of the inverter circuit built in ANSYS Simplorer to control the inverter circuit the magnitude of the output voltage2.Comparative study of several motor control strategies.The control strategy of the motor is added on the simulation platform of field-circuit coupling.Three control strategies,id=0,MTPA based on electromagnetic torque and MTPA based on stator current,were built in MATLAB/Simulink to observe the variation of motor speed using different control strategies in the range of base speed and field weakening,and to compare and analyze the influence of the three control strategies on motor operation.3.The magneto-thermal coupling model of the motor is built.In this paper,the method of magneto-thermal coupling is used to calculate the temperature field of the motor,and the loss calculated in the field circuit coupling model of the motor is imported into the temperature field of the motor,and the boundary conditions of the internal temperature field of the motor are set.The influence of three control strategies on the temperature field of the motor is analyzed.4.Set up an experimental platform for permanent magnet synchronous motors.Use laboratory equipment to set up a motor temperature test bench,observe the effects of three different control strategies on the motor speed and temperature in the range of base speed and field weakening,verify the simulation results.