The thesis first explains the basic running principle and the characteristic of the Direct Torque Control (DTC), and presents the arithmetic model of the three-phase asynchronous motor, as well as its basic equation of voltage and flux.

• 本文首先论述了三相异步电动机直接转矩控制系统的基本工作原理及特点，介绍了三相异步电动机的数学模型及其电压、磁链方程，较详细地论述了直接转矩控制的控制思想：基于定子坐标的定子磁链、电磁转矩观测；