Online rotor resistance estimation based on MRAS-sliding mode observer for induction motors

This paper deals with rotor resistance estimation for induction motors drives purpose. A novel MRAS structure for rotor resistance adaptation is proposed. It is based mainly on the use of a very robust sliding mode flux observer as reference model, which gives robustness to the whole parameter estimation operation. Unlike to classical MRAS structure, based on the use of pure integrators, which have initial value and drift problems. By using the proposed MRAS-Sliding mode observer, system has a better performance and robustness. Effectiveness of this proposed estimation structure is verified by experiment under critical disturbance conditions.