直接转矩控制系统中感应电机定子电阻模糊观察

Fuzzy Observation for Stator Resistance of An Induction Motor in A Direct Torque Control System

研究了感应电机定子电阻随绕组运行温度变化的规律。基于模糊理论，设计了一种模糊电阻观察器。选用电机绕组端部温度及其时间变化率两个与定子电阻值直接相关的物理量作为模糊观察器的输入量，简化了模糊关系，以提高系统的实时性，利用实验方法总结了模糊控制规则、隶属函数，观察精度可满足直接转矩控制系统的控制要求，为改善系统的低速性能提供了一种有效方法。

The variation pattern in the stator resistance of an induction motor with the coil temperature isinvestigated. One kind of fuzzy observers, based on fuzzy logic and for measuring instantaneous resistance isintroduced.The two variables, T and T/t, measured at the coil ends and directly related to the statorresistance are selected as the input of fuzzy observer to simplify the fuzzy relations. Thus the real-time propertyof the system will be improved. The fuzzy control rules and membership functions are obtained by analyzing theexperimental results. The observing accuracy can meet the requirement for the direct torque control system. Itis proved to be an effective way to improve the low-speed performance of the system. The results, observed andgained through experiments are compared in the later part.