电动汽车电机驱动控制策略研究Investigation on control strategy of motor drive for electric vehicle 摘 要本论文首先介绍了异步电动机的数学模型，通过坐标变换，得到了异步电动机的空间矢量等效电路。并由理想逆变器的 8 种开关状态入手，得到了理想逆变器的数学模型，建立了空间电压矢量的定义。并在此基础上对定子磁链和电磁转矩与空间电压矢量之间的关系进行了分析，阐述了六边形磁链轨迹和近似圆形磁链轨迹异步电动机直接转矩控制系统的结构和工作原理。根据异步电动机直接转矩控制的工作原理，本论文在 MATLAB/Simulink 的平台下，分别搭建了六边形磁链轨迹和圆形磁链轨迹直接转矩控制系统模型。并对仿真结果进行了相应的分析，验证了异步电动机直接转矩控制策略的可行性。而且，对两种磁链轨迹直接转矩控制系统的优缺点及应用范围进行了比较。本论文以电动汽车的电机驱动部分为研究对象，对于异步电动机的直接转矩控制技术进行了较为深入的理论研究，在电动汽车及其他相关领域的应用具有一定的参考价值。关键词：电动汽车；电机驱动；直接转矩控制AbstractThis thesis starts with the mathematic model of the induction motor, and gets the space vector equivalent circuit by coordinate transform. The mathematic model of the inverter and the concept of the voltage space vector are gotten from the eight switched states of the inverter. Then, this thesis describes the structure and the principle of the DTC system both in hexagon flux track and in round flux track for induction motor based on the analysis of the relations between stator flux and electrical torque with voltage space vector.The DTC system models in hexagon flux track and in round flux track are built on the platform of MTATLAB/Simulink separated upon the principle of DTC. The feasibility of the strategy of the DTC for induction motor is testified by the simulation, and the performances of the two kinds of DTC system are compared also.This thesis makes a further theory research, and makes a software and hardware...
