永磁同步电动机的直接转矩控制方法

Direct Torque Control Method of Permanent Magnet Synchronous Motor

永磁同步电动机是一种强耦合的非线性系统。该文针对永磁同步电动机的特点，对其直接转矩控制方法和调速控制原理进行了深入的研究。文中首先介绍了永磁同步电动机的基本结构，并根据电机基本原理建立了三相永磁同步电动机在转子坐标系下的数学模型，分析了该型电动机直接转矩控制的基本理论，最后给出了永磁同步电动机直接转矩控制系统的原理。仿真结果表明，不但电机的转矩响应快速而平稳，而且在不同基准速度给定下系统均具有较好的适应性。

Permanent magnet synchronous motor （PMSM） is a kind of close coupling nonlinear system. The direct torque control （DTC）method, together with the speed control principle of PMSM is discussed in-depth with the consideration of the characteristics of PMSM. The basic structure of PMSM is first introduced in the article and then, according to the fundamental principle of motor, the mathematical model of threephase PMSM under rotor coordinate system is set up. Then the basic theory of DTC of the above-men- tioned motor is analyzed, and finally the principle of DTC system of PMSM is proposed. The simulation results indicate that the motor＇s torque response not only has higher dynamic performance, but also improves the adaptability to different reference speeds.