The vector control of an induction motor has been applied in various industrial applications instead of a DC motor.
The rotor speed value is used this vector control and it is gained by speed sensor. However, it decreases the system reliability and increases systems cost. Therefore, various control algorithms have been proposed for the estimation of speed.
This thesis proposes a new algorithm of sensorless speed control of induction motor. The proposed algorithm is based on a torque equation using the theory of MRAC(Model Reference Adaptive Control). It is robust for parameter variation and disturbance. The estimated speed is used as feedback in a vector control system.
To show the validity of the proposed algorithm, computer simulation and experimental test have been implemented. The result has been proven an excellent characteristic of the drive system.