Robust sliding mode observer application in vector control of induction motor

摘要

During last years, sensorless control is one of the most favorite field in control of AC machines, especially induction motor drives. Sensorless control means that an encoder is replaced by estimated speed from an observer or an estimator. Sensorless control reduces cost and increases the reliability of the system. However, the accuracy of the observer or estimator depends on induction motor parameters. In this paper, the robust sliding mode observer with estimated rotor and stator resistances is investigated. The proof of stability of the algorithm is also presented. The robust sliding mode observer is verified through simulations and experiments with an induction motor drive. Some of control methods such as PI control and sliding mode control are used in the experiments.