Speed-sensorless vector control system of multiple induction motors

Speed-sensorless control is applied for induction motors in an electrical transportation system and some industry applications. In multi-motor drive system, the control becomes very complicated and has not been studied extensively. In this paper, a speed-sensorless vector control model of three induction motors, which is controlled by one inverter is established. Besides, the proposed control method analyzes and designs the feedback gains to ensure the stability of the estimate system in all the range and the robustness to parameters. The validity of the model is verified by the experiment results.