直接转矩控制系统定子电阻观测的研究

The research of stator resistance observation in DTC system

目前直接转矩控制系统是控制感应电动机的一种新兴技术,它不需要复杂的控制算法就可以得到异步电动机的磁链和转矩．但是感应电动机定子电阻的变化影响直接转矩控制系统的低速性能,因此调节电动机的定子电阻是非常重要的．本文综述了直接转矩控制系统定子电阻观测方法的研究现状,阐述了定子电阻不同的观测方法,并展望了直接转矩控制技术的应用前景．

Direct torque control （DTC） system is currently one of the favorable control technique for controlling induction motor drivers. It allows the precise and qufck control of the inductfon motor flux and torque without calling for complex control algorithms. The change of the in induction motor will greatly affect the performances of DTC system run at low speeds. So tuning the stator resistance of induction motors is very important. This paper summarize present situation of stator resistance observation methods in DTC, then evaluates observation methods of stator resistance. We also analyse DTC direction and application in the future.