Stabilization of induction motor with sensorless drives based on parameter self-optimization

Low-speed regenerating mode of induction motor with sensorless drives often appears unstable phenomenon. In this paper, the flux equation only related to electrical rotor speed was obtained using indirect field oriented voltage model, and the system dynamics was adopted to analyze voltage model of induction motor, which indicated that multiple equilibria exist in induction motor. The stability of the equilibria was analyzed according to the vector diagrams and the criteria of stability of induction motor were obtained. At last, the stability of equilibria was developed by using parameter self-optimization model. The correctness and feasibility of the proposed method were verified by simulation and experiment results.