Tracking techniques for rotor position control of induction motors

A novel application of quadratic tracking techniques to speed and rotor position control of induction motor drives is introduced. These methods can adaptively adjust the motor speed and/or current to follow certain desired tracks. The tracking performances of the induction machine with these control methods are illustrated through a variety of computer simulations. It is shown that the suboptimal tracking is only effective if the track time constant is much smaller than the final time used to compute the driving vector. An improvement of the suboptimal linear quadratic tracking method is proposed to eliminate this limitation. The test results indicate that the speed of the motor follows the desired track with more than 98% accuracy throughout the tracking time. It is noted that the proposed control method should enhance the use of induction motors in position control applications such as robotics, manipulation, and actuation