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分析了直接转矩控制的原理，提出了反转工作电压的概念和在线选取电压空间矢量的方法，针对转速闭环控制提出了双模状态辨识跟随逼近式控制策略，给出了按圆形轨迹控制的仿真结果。
The principle of direct torque control is analyzed. The concept of inverting the working voltage and the method of online selection of voltage space vector are put forward. The control strategy of dual-mode state following following approximation is proposed for speed closed-loop control. Simulation results.