Abstract - Aschere for sensorless reasurement of rotor speed and slipusing rotor slot haroonics of a three phase squir relcage induction motor i s proposed in this paper. The scheme is
irplerentedusing aicrocontroller 80C196 to develop an'ELECTRONIC TACHOIIETER' and is based on 8 novel technique of
extract ingrotorslot har Aonics fror the various voltage
ripples induced in the stator windings. The paper also
discusses the various schemes to process the rotorslot
harmonic signal to obtai r ot or speed and slip information.
Experiuental result s are presented.