In this paper an approach to estimate the speed and

the stator flux linkage of a three Phase induction motor by

means of an algorithm using dSPACE is proposed. Emphasis

is given on reduction of the problem of saturation associated

with the pure integrator, while flux estimation. Speed is

estimated using a sensor (MOC7811) mounted at the motor

shaft. Experimental investigation is carried out on a 1 H.P.

motor, a digital inverter controller, an IGBT power module

for inverter/chopper and dSPACE Controller Board

(CP1104). Real time signals like three phase currents, PWM

Pulses, fixed DC link voltage and response of sensor

MOC7811 are the input parameters to the Dspace controller

board, and using these parameters stator flux and speed is

estimated.