基于MRAS的感应电动机无速度传感器控制方法

摘要

In view of problem that traditional speed identification algorithm of induction motor only indentifies motor speed but does not consider influence of change of stator resistance on identification of motor speed, the paper proposed an improved method of speed-sensorless control of induction motor based on MARS. The method respectively uses output of voltage model and current model as expected value and estimating value of rotor flux and stator resistance, then according to MARS theory, it takes voltage model as reference model and current model as self-adaptive and adjustable model to indentify motor speed and stator resistance. The simulation result showed that the method can indentify motor speed and stator resistance simultaneously, which eliminates influence of change of stator resistance on identification of motor speed and improves low-speed identification performance of induction motor control system.%针对传统的感应电动机转速辨识算法只对电动机转速进行辨识,而没有考虑定子电阻的变化对电动机转速辨识所带来影响的问题,提出了一种改进的基于MARS的感应电动机无速度传感器控制方法.该方法采用电压模型的输出作为转子磁链、定子电阻的期望值,电流模型的输出作为转子磁链、定子电阻的推算值,根据MARS理论,以电压模型作为参考模型、电流模型作为自适应可调模型,进行电动机转速、定子电阻的辨识.仿真结果表明,该方法能够同时辨识电动机转速和定子电阻,有效消除了定子电阻发生变化对电动机转速辨识带来的影响,提高了感应电动机控制系统的低速辨识性能.