Model reference adaptive system with simple sensorless flux observer for induction motor drive: MRAS with simple sensorless flux observer for induction motor drive

In this paper a model reference adaptive system (MRAS) with sensorless flux observer for the control of induction machine is presented. The technique uses two models for the estimation of stator and rotor fluxes, stator currents, and rotor speed. The used observer as reference system does not contain rotor speed and is sensitive to motor parameters. This feature makes the observer very effective for the use in MRAS technique. The estimated rotor fluxes from the observer system (reference system) are used for the identification of rotor angular speed in the adaptive model. The used adaptive model is based on rotor equations and it contains rotor speed, which should is identified using an adaptive approach. Simulation results have been carried out.