Research On Electric Vehicle Motordrive Control System

With the increasing depletion of traditional energy sources and increasing environmental pollution,electric vehicles with high energy efficiency,low noise,and no pollution have become increasingly popular.The three electric systems such as battery,electric drive and electric control are the three core components of electric vehicles.Among them,the motor drive control system directly affects the performance of electric vehicles and the safety,reliability and economy of vehicle driving.It is of great significance to study the control strategy,hardware and software of automobile motor drive control system.This thesis studies the electric vehicle motor drive control system.In this thesis,the permanent magnet brushless DC motor(BLDCM)is selected as the driving motor of electric vehicles.Based on the analysis of the working principle,mathematical model and double closed-loop PI control technology of the brushless DC motor,the permanent magnet brushless DC is designed and built.The Simulink simulation model of the motor double-closed-loop fuzzy PI control system uses a fuzzy PI control for the speed outer loop and a classic PI control for the current inner loop.This thesis designs the hardware circuit of the motor drive control system.Among them,the three-phase full-bridge inverter circuit is designed by using 6 IGBTs and 3 high and low side gate drive chips using HPWM-LON modulation method,and the control circuit is designed with ST company STM32 series single-chip microcomputer as the core,using Hall current sensor and Hall position sensors and other design of current voltage and position speed detection circuit.This thesis designs the overall software framework of the motor drive control system,uses modular programming to design the main program and various interrupt programs,including rotor position detection,motor commutation and speed calculation programs,speed loop fuzzy PI control program,current loop PI control program,Motor start,stop and protection procedures,etc.The simulation results prove that the design scheme in this thesis is effective and feasible,can realize the functions of motor driving and control,and has good control accuracy,dynamic and static performance and anti-interference ability.