DESIGN AND DEVELOPMENT OF DSP BASED SENSORLESS CONTROL OF INDUCTION MOTOR DRIVES USING MODEL REFERENCE ADAPTIVE SYSTEM

The present paper deals with the speed estimation o f the induction motor using observer with Model Reference Adaptive System (MRAS). The first p art of the paper includes the mathematical description of the observer for the speed estimation of the induction motor. The second part describes the simulation results which are shown for different changes of the induction motor speed which confirm high dynamic properties of the induct ion motor drive with sensorless control. The third part describes experimental implementation using DSP controller. An adaptive state observer, MRAS is tested on two different schemes to observe rotor speed. The stability analysis and continuous and discrete models of each scheme are investigated. The high performance of these schemes is shown in simulations and experimental results.