Design of rotor flux observer with adaption of motor parameters for induction motors

YU Fuliang, DENG Zhiqi, CHEN Yangsheng
(College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract: In order to solve the problems of the field oriented inaccuracy caused by the variation of induction motor parameters during operation, a novel flux observer with parameters adaptive was proposed based on Luenberger observer. Firstly, the principle of the observer was elaborated. To aviod the flux error, which is unavailable, a new variable was introduced. Then, the adaptive laws of motor parameters was designed based on Lyapunov equation. Finally, the convergence of the algorithm and the effect of stator resistance mismatch were evaluated on Matlab and DSP2812 respectively. Simulations and actual experiments show that the method can observer the rotor flux with autotuning rotor resistance and rotor time constant identification. The algorithm is robust to stator resistance.
Key words: flux observer; induction motors; field oriented