Application of encoderless vector control techniques in a medium performance induction motor drive

This paper looks at the application of encoderless vector control in medium performance induction motor drives. In recent publications some attention has been given to methods which utilize adaptive flux observers to identify rotor speed. This paper evaluates some of these techniques with particular focus on their application in a single processor drive. The authors discuss three MRAC (model reference adaptive control) speed estimation techniques: rotor flux MRAC, MRAC using counter EMF, and MRAC using reactive power