Abstract - In order to improve the reliability and
adaptability of control system induction motor, a speed
sensorless vector control system for induction motor
based on DSP (TMS320F240) is presented. Combined
with a rotor flux and speed observer based on a PI model
reference adaptive system (MRAS), a speed sensorless
field-oriented control (FOC) system for induction motor is
introduced. The motor speed is estimated based an the
difference between two flux estimators. The proposed
control method, simulations, implementation data, and
test results are given and show the good performance for
the vector control system in torque, speed and robustness.