Study On Field-Circuit Coupled Finite Element Method Of Asynchronous Traction Motor Fed By PWM Inverter

ABSTRACT:In recent years, according to the needs of the national economic development, the Chinese government put forward the overall plan of railway leap-forward development. In this context, the locomotive manufacturing enterprises of Chinese developed a series of CRH high-speed emu. The driving force of the high-speed emu is directly from the three-phase asynchronous traction motor, so the study of asynchronous traction motor is particularly important. To find a can higher precision simulation method for the research and development of asynchronous traction motor has important significance.In this paper, the600kW high-power three-phase asynchronous traction motor was studied, and a field-circuit coupled finite element analysis method of the asynchronous traction motor was presented. The field-circuit coupled finite element simulations of the asynchronous traction motor fed by SPWM and SVPWM inverter were completed, and the asynchronous traction motor in the running characteristics of two kinds of PWM power supply mode were done to a comparative analysis.At first, the basic theory of finite element method to calculate the motor and electromagnetic field finite element simulation analysis software Ansys Maxwell were simply introduced in this paper. The finite element2D simulation model of the600kW high-power three-phase motor was established in Maxwell14. The simulation results of the model were compared with the rated value of the asynchronous traction motor to prove the validity of the simulation model. Then, the working principles of the SPWM and the SVPWM inverter circuits were respectively introduced, and the simulation models of the SPWM and the SVPWM inverter circuits were established in Ansys Simplorer9. Through the comparative analysis of the harmonic distribution of the output line voltage under the different constraints, choose the optimal solution to determine the modulation parameters and the dc voltage of the two inverter circuits. The co-simulations were completed which involving finite element analysis and equivalent circuit simulation together for PWM (SPWM and SVPWM) inverters fed asynchronous traction motor assisted based on Maxwell2D and Simplorer. Finally, this paper from the utilization rate of dc voltage, current, loss, torque and flux linkage of the two field-circuit coupled finite element simulations to do a comprehensive comparison and analysis. The simulation results demonstrated the asynchronous traction motors were brought adversely affect by PWM inverter; And the advantages of SVPWM supply mode contrast to SPWM supply mode were presented.