A novel model reference adaptive controller for estimation of speed and stator resistance for vector controlled induction motor drives

This paper presents a new adaptive speed estimation technique for the vector controlled induction motor drive. A model reference adaptive system (MRAS) is formed using instantaneous and steady state values of V * × I in the reference and adjustable models respectively. Such formulation does not require flux estimation and is stable in all the 4- quadrants of operation. Proposed MRAS with stator resistance compensation is suitable for low and zero speed operation. The implementation does not require any additional sensors and therefore is very suitable for retrofit applications. Assuming that the speed is available from a speed encoder the controller may be slightly modified to estimate stator resistance. The proposed technique is simulated in MATLAB/SIMULINK and experimentally validated through a dSPACE-1104 based laboratory prototype. The stability of the proposed MRAS is verified through stability analysis and sensitivity of the controller to the variation of various machine parameters is also investigated.