随着电力电子技术以及各类电机控制技术的迅速发展，直接转矩控制技术以其控制思想简单、动态响应速度快及受电机参数影响小等优点受到了广泛的关注，因此从实际应用出发，研究以数字信号处理器（DSP）为核心器件的异步电机直接转矩控制系统具有重要的现实意义。 本文首先对异步电机的数学模型进行分析，在此基础上阐述了直接转矩控制的基本原理和六边形磁链控制与圆形磁链控制策略等传统方法，同时总结了传统直接转矩控制的优缺点，针对传统方法中的不足，介绍了基于空间电压矢量脉宽调制的直接转矩控制（SVM-DTC）和它的具体实现方法，SVM-DTC采用PI控制器替换了传统直接转矩控制中的滞环比较器，并用空间矢量调制技术替代了传统的电压矢量选择表，它通过控制各个电压空间矢量的作用时间和顺序，使电机的磁链轨迹逼近圆形，其次根据传统直接转矩控制和SVM-DTC原理，在Matlab/Simulink环境下对传统直接转矩控制和SVM-DTC两种方法进行仿真建模，仿真结果表明，SVM-DTC相比传统方法能有效的减少控制系统的转矩脉动和磁链脉动同时保证开关频率的恒定。 最后，在理论分析基础上，以DSP为主控芯片，完成了直接转矩调速系统的硬件电路设计（包括主电路、驱动隔离电路、检测电路、保护电路等）和控制算法的软件设计，对控制系统的性能进行了测试与分析，运行结果表明该控制系统能够实现SVM-DTC调速系统，通过对实验结果和在实验中出现问题的分析，为后续研究基于SVPWM方法的异步电机直接转矩控制奠定了良好的基础。

With the power electronic technology and the rapid development of all kinds of motor control technology, Direct Torque Control technology received widespread attention due to its simple thought, fast dynamic response and the advantages of the small effect from motor parameters,and therefore starting from the actual application,researching on the direct torque control system of the asynchronous motor based on digital signal processor (DSP) as the core device has important practical significance. Firstly, this paper analyzes the mathematical model of the asynchronous motor, and expounds the basic principle of direct torque control and introduces the hexagon flux control and circular flux control strategies of the traditional method on the basis of the analysis, summarizes the advantages and disadvantages of the traditional direct torque control, aiming at the deficiency of the traditional method, this paper introduces one method based on space vector pulse width modulation of the direct torque control (SVM-DTC) and its concrete realization method, SVM-DTC adopts PI controller to replace the hysteresis comparator of the traditional direct torque control, using space vector pulse width modulation technology replaces the traditional voltage vector selection table, making the motor flux trajectory approach circular by means of each time and sequence of voltage space vector control, secondly, according to the principle of the traditional direct torque control and SVM-DTC, under the Matlab/Simulink environment, building the traditional direct torque control and SVM-DTC two methods for the simulation modeling, the simulation results show that the SVM-DTC compared with the traditional method can effectively reduce torque ripple and the flux pulsation of the control system, at the same time to ensure the switching frequency constant. Finally, on the basis of theoretical analysis, this paper accomplishes the direct torque control system hardware circuit design with DSP as main control chip, including main circuit, driving isolating circuit, detecting dircuit and protection circuit,etc, and software design of control algorithm, the performance of the control systems design was testes and analyzed, the results show that the control system can realize the SVM-DTC speed control system, the experimental results and the analysis of the problems in the experiment laid a good foundation for follow-up study direct torque control based on SVPWM method of asynchronous motor.