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Field-oriented control of induction machines is widely used in high-performance applications. However, detuning caused by parameter disturbances still limits the performance of these drives. In order to accomplish variable speed operation conventional PID-like controllers are commonly used. These controllers provide limited good performance over a wide range of operation, even under ideal field oriented conditions. An alternate approach is to use a so-called "fuzzy" controller. In this paper, a self-tuning fuzzy controller is implemented. The proposed controller has the ability to adjust its parameters online according to the error between actual machine speed and a model reference. The scheme is compared to conventional PI control and validated by simulation and experimental tests of both control techniques.