Abstract - A schere for sensorless reasurement of rotor speedand slip using rotor slot haroonics of a three phase squirrel cage induction motor is proposed in this paper. The scheme is
irplerente dusing aicocontroller 80C196 to develop an 'ELECTRONIC TACHOIIETER' and is based on 8 novel technique of extracting rotors lot harAonics fror the various voltage ripples induced in the stator windings. The paper also discusses the various schemes to process the rotor slot
harmonic signal to obtain rotor speed and slip information. Experiuental result s are presented.