摘要如今，随着能源危机的爆发和汽车燃油消耗带来的环境污染日益严重，世界上的发达国家都在积极开展电动汽车技术的研究。为了减小电动汽车驱动系统的体积,提高系统的稳定性，人们纷纷开始研究异步电机的无速度传感器矢量控制技术。然而这种方法首先要解决两个问题：转子磁链观测和转速估计。论文深入研究了基于模型参考自适应法（MRAS）的无速度传感器按转子磁链定向的系统控制方法，采用空间矢量脉宽调制技术（SVPWM）和转子磁链定向算法，根据MRAS的原理进行转速估计。
本文先根据基本电机原理建立了异步电机在矢量空间不同坐标系下的数学模型，介绍了矢量控制系统并对SVPWM的原理进行了深入分析；接着对MRAS技术进行了详细介绍，给出了转子磁链定向下的转速估计方程和磁链方程；最后对上述系统进行仿真，在Matlab/Simulink平台上对系统进行建模及仿真，仿真结果说明MRAS系统进行转速估计时精确性很高，整个系统稳定可靠。
关键词 异步电机 无速度传感器 空间矢量脉宽调制技术（SVPWM） 26089
模型参考自适应法（MRAS）
毕业论文设计说明书外文摘要
Title The research of motor control technology for electric vehicle with speed-sensorless
Abstract
Currently, under the background of energy crisis and the serious pollution caused by the automobile exhaust, almost developed countries are committed to the research and development of the electric car. In order to reduce the volume the electric vehicle and improve the reliability of the system, induction motor speed sensorless vector control system has become the focus of attention of the people. However, such systems need to solve two problems: the rotor flux observation and speed estimation. In this paper，a novel scheme of speed sensorless field oriented vector control system based on MRAS (Model Reference Adaptive System)is proposed. By using voltage space vector pulse width modulation(SVPWM) control technology and field-oriented control(FOC) algorithm, in accordance with the principle of MRAS, the program estimated the rotor speed.
First, the mathematics model in different coordinates of state space is established, the vector control system was introduced and the paper discussed the principle of SVPWM in-depth. Then, the principle of MRAS is discussed in detail, the function of speed estimation and the equation of rotor flux observation is established. At last, the simulation is taken. The emulate modulations of the system are constituted on Matlab/Simulink, and the results prove that the MRAS method can estimate speed efficiently, and the system is feasibility.
Keywords Induction motor Speed sensorless SVPWM MRAS
目 次
1 绪论 1
1.1 课题研究的背景及意义 1
1.2 电动汽车的发展历史及现状 1
1.2.1 国内电动汽车发展现状 1
1.2.2 国外电动汽车发展现状 2
1.3 电动汽车中异步电机的应用 2
1.4 无速度传感器矢量控制技术的发展现状 3
2 异步电机矢量控制技术 6
2.1 坐标变换 6
2.1.1 CLARK变换（3/2变换） 7
2.1.2 PARK变换（2s/2r变换） 8
2.2 三相异步电机的数学模型 9
2.2.1 三相静止坐标系下的电机数学模型 10 无速度传感器的电动汽车电机控制技术研究:http://www.youerw.com/zidonghua/lunwen_20148.html