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在深入研究异步电机直接转矩控制的基础上，提出了基于模型参考自适应方法的速度辨识器， 并将之改进． 仿真结果证明， 应用该速度辨识器的无速度传感器的直接转矩控制系统具有较好的动态性能
On the basis of deeply studying the direct torque control of induction motor, a speed recognizer based on model reference adaptive method is proposed and improved. The simulation results show that the speed sensorless direct torque control system with this speed recognizer has better dynamic performance