Speed sensorless vector control of induction motor based on the MRAS theory

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 motors is introduced. The motor speed is estimated based on 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.