关于感应电机转速观测和转子电阻辨识的研究

针对利用感应电机的定子电流同时实现转子电流和转速观测、转子电阻辨识，进行了较为深入的探讨。以Lyapunov稳定判据作为设计的基础，利用变结构控制方法来抵消不可知部分，设计出一转速预测器和一转子电阻辨识器；指出当二者独立工作时都无差收敛，但组合工作时无差收敛性无法保证；通过理论分析表明，无差收敛性的破坏起源于感应电机的本质耦合，因而不可能构造出无差收敛的组合转速观测器和转子电阻辨识器。最后通过一感应电机的仿真说明了所做分析的正确性。

STUDY ON THE SPEED OBSERVER AND THE ROTOR RESISTANCE IDENTIFIER FOR AN INDUCTION MOTOR

This paper studies thoroughly on using the available stator current of an induction motor to observe the rotor current and the speed, and to identify simultaneously the rotor resistance. The observer and the identifier are all designed on the base of the law of Lyapunov stability, and all realized by the introduction of the variable structure factor which counteracts the uncertain factors. When the observer and the identifier work independently, their errors all converge asymptotically to zeros; when they are incorporated together, their errors can not be ensured to converge to zeros. The theoretical analysis demonstrates the destruction of the good property, asymptotical convergence with non zero static errors, results from the essential coupling of the induction motor, furthermore it is impossible to realize the incorporated observer and identifier whose static errors are all zeros. The simulations show the validity of the analysis.