Reseach On Parameter Identification Of Induction Motor

The induction motor speed regulation system based on the rotor flux vector control,can get exciter current and torque current which has decoupled through the coordinates transformation. Then the two signals are controled, can make induction motor is comparable in dc speed control system for the performance index. This kind of system lies in the rotor flux accurate, but rotor flux signal lies in the right motor parameter estimation.So when we design induction motor vector control system, we should know some induction motor parameters to estimate the rotor flux, establish flux observer, design the current, and speed controller.The induction motor mathematical model and vector control system are briefly introduced at first. On the basic of T equivalent circuit model of induction motor at standstill state, we use pluse voltage or single phase AC as an excitation signals to measure the static of parameter for induction motor, simulation experiment goes by using Matlab/Simulink, the experimental results indicates,the off-line identification method has good accuracy. Later in the motor parameters change influence rotor flux chain points down, leads to the online identification motor parameters. This paper is used model reference adaptive method (MRAS) for induction motor rotor resistance online identify, researched a online identification method on a instantaneous reactive power for the model. In this method,the reference model is getted through the potential of the stator and current get reactive power, so they have not been subject to influence stator resistance, the simulation experiment simulation experiment results show that the method is feasible.