Research On Asynchronous Motor Control Technology For Electric Vehicle

With the development of technology and improvement of people’s living standards,private car has already become the most important vehicle in people’s daily life.However,the traditional fuel vehicles use fossil fuels and exhaust emission,that will bring a serious environment pollution and a big consumption of nonrenewable resources.Therefore,electric vehicles have become one of the most important developing direction in automotive industry around the world.Asynchronous motor,which is most commonly used in EV is studied in this article.Taking the special need of driving system in EV application as a starting point,some important asynchronous motor control technologies are analyzed theoretically.Firstly,the development of EV and motor control technology is introduced.This part also contains overview of the composition of electric vehicle motor drive system and the selection problem of driving motor.Then,the mathematical model of asynchronous motor is derived.The vector control technique and direct torque control technique are introduced.On the basis of these two control techniques,the stator field-oriented control technology is put forward.And the PWM technology is introduced in detail,including CHBPWM and SVPWM.Finally,simulation model of the asynchronous motor control system is built in MATLAB/Simulink.With the simulation test in different working condition of EV,the theoretical analysis in the paper is proved.