Sensorless indirect rotor flux oriented control of a five-phase induction motor based on sliding mode observer

In this paper, a new sliding mode observer is developed for the indirect rotor flux oriented control (IRFOC) of a Five-phase Induction motor drive. Numerous observer structures for Five-phase induction motor drive is presented in the literature with acceptable performances. However, the objective of this work is to develop and test another family of observers based on the sliding mode approach. This structure is considered as a high gain observer which gives firstly good dynamic performance and secondly high robustness. The shortcoming of the sliding mode observer (SMO) is the chattering phenomena. It seems that the chattering problem can be reduced by replacing the signum function by saturation function in the observer structure. To grantee the closed-loop stability of the proposed observer control, stability analysis based on the Lyapunov theory is presented. Simulations results demonstrate and justify the validity of the proposed structure observer.