一种异步电机直接转矩控制的建模与仿真

Modeling and Simulation of Direct Torque Control for Asynchronous Machine

介绍以异步电机定子电压矢量为手段,控制电机的电磁转矩和定子磁链的DTC(Direct Torque Control)方法,建立异步电机旋转空间变换动态数学模型,实施α'β'转子坐标系、αβ定子坐标系变换到dq旋转坐标系上,改变定子电压squ幅值来控制定子磁链的角速度wd,进而控制电磁转矩。利用Simulink和M函数的强大仿真功能,对其进行直接转矩控制仿真。仿真结果表明,该数学模型较好地反映了异步电机调速特性,控制效果较好,验证了数学模型的有效性。

This paper introduces the method of DTC about induction motor which controls the motor electromagnetic torque and stator flux with stator voltage vector. It transforms the stator coordinate and rotor coordinate to the same rotating coordinates based on dynamic mathematical model of asynchronous motor, which is set up in accordance with the generalized coordinates. Electromagnetic torque and flux angular velocity can be controlled by the stator voltage. Simulation results of the dynamic mathematical model shows that the mathematical model has a good control effect by means of Simulink and M function of Matlab. At the same time, it also verifies the accuracy of dynamic mathematical modeling.