Rotor Parameter Identification Of Induction Motor Vector Control System

This paper focus on the motor parameters identification. The parameter identification methods of offline and online are researched respectively. The main work of the paper are as follows:The structure and working principle of vector control system are briefly introduced, the mathematical model of rotor time constant, rotor flux and torque are derived.The effects of the changed motor parameters on rotor flux observation are analyzed based on the model. On the same time, the effects of AC rotor time constant on vector control are qualitatively analyzed, and the importance of rotor time constant identification is clarified.In order to improve the identification accuracy of the motor parameters, this paper analyzes the offline parameter identification theory of induction motor, identifies rotor resistance, stator resistance, stator and rotor leakage inductance, and mutual inductance. The model reference adaptive system is adopted to identify the asynchronous motor rotor time constant online. The ideal mathematical model of asynchronous motor in two-phase static coordinate is established. The adjustable model changed with rotor time constant is constructed. The error equation of the adaptive system is derived. The rotor time constant adaptive law based on Liapunov stability theory is designed. The rotor time constant identification algorithm is derived.The online parameters identification method is applied to asynchronous motor vector control system. The step response and tracking performance simulation using Matlab/Simulink are completed. The results show that the parameters identification algorithm has good convergence speed and good tracking performance.