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Conventionally, a fixed gain Proportional-Integral (PI) controller is used for the speed regulation of a field oriented induction motor drive system. The performance of fixed gains PI speed regulator deteriorates in the presence of external disturbances and motor parameters variation. This paper investigates the performance of an adaptive high-gain PI controller to overcome the speed regulator degradation problem. High-gain adaptative PI controller, when tested on an induction motor drive system, becomes unstable because PI gains increase unboundedly. Therefore, this work uses sigma, dead zone, and epsilon modifications on high-gain controller adaptation law to mitigate the instability problem. The performance of modified high-gain adaptive PI controller is experimentally investigated on an Indirect Field Oriented (IFO) induction motor drive system. The experimental results reveal that dead zone and epsilon modification of adaptive high-gain PI controllers outperform the fixed gains PI controller in terms of speed tracking and torque commanded current.