Study On Permanent Magnet Synchronous Motor Drive System Of Battery Electric Vehicle Based On Vector Control

Battery electric vehicle is a kind of single power source vehicle, which is driven by electric machine. With the obvious advantages of zero emission, free of contamination, diversified energy sources, and relatively simple structure, battery electric vehicle has a broad prospect of development. Motor drive system is the core of the battery electric vehicle power system. Permanent magnet synchronous motor (PMSM) has gradually become the main stream among a variety of vehicle drive motors due to its high efficiency, high power density, and great reliability. Therefore, it is of great significance to research PMSM drive and control technology of electric vehicle.In this dissertation, on the basis of analyzing the mathematical model of PMSM, vector control method and space vector pulse width modulation (SVPWM) technology, the control scheme of PMSM drive system for electric vehicle was proposed. Through the analysis of internal relation between SVPWM and boost chopper, regenerative braking principle of PMSM drive system was studied, and the negative correlation between battery charge current and the voltage vector amplitude on the negative q-axis under generator mode was established, which provided a theoretical basis for the implementation of the electric vehicle regenerative braking. The simulation model of PMSM vector control system based on the maximum torque-per-ampere (MTPA) strategy was realized with MATLAB/Simulink and the superiority of MTPA control was proved through the comparative simulation with id=0 control. The dissertation mainly introduced the hardware and software designs of PMSM controller with TMS320F2812 as the core. As for position and current signals, their sensor interface circuits and software processes were detailed. The dissertation also presented a mechanical structure design that meet the automotive application requires for the controller. Through bench experiments the overall design of the PMSM controller was verified, and the corresponding waveforms were given. Finally, in order to achieve vehicle test requirements of the motor drive system, details of the design and implementation process of the battery electric vehicle prototype were introduced. A large number of road tests verify the feasibility and reliability of the motor drive system and its vehicle operation.