基于改进型自适应状态观测器的异步电机低速性能研究

novel sensorless vector control method for induction motor based on improved adaptive full-order observer is proposed in this paper. The system stability is analyzed according to the Popov hyper stability theory, and based on the thorough study of the traditional adaptive full-order observer, the selection principle of observer's feedback gain matrix scheme is studied, and a proper feedback gain matrix is designed to ensure the stability of system in the full speed range. By analyzing the impact of the stator resistance variation over the speed estimation in low-speed range, the improved adaptive full-order observer is designed, and the rotor speed and stator resistance could be identified simultaneously. Therefore, the low-speed performance with load is improved effectively. The improved adaptive full-order observer is verified by the experiment and the experimental results show the feasibility and effectiveness of the algorithm.