Performances Evaluation of PI and FL Speed Controllers for Induction Motor under Open-End Stator Winding with Broken Bars Fault

Direct Torque Control (DTC) technique is one of the most effective strategies for an electric machines. It aims to provide a decoupled control of torque and flux via a simple command structure. The aim of this paper is the study of the problems that can affect the operation of the speed loop for Induction Motor Open-End Winding (IM-OEW) through failures, especially broken bars fault, its impact on the control and operation of the motor. This paper presents a comparative study of the most powerful speed controllers for motor: proportional plus integral (PI) controller and a fuzzy logic (FL) controller. The awaited goal is to evaluate the speed controller is capable to improve the performance of the machine under faulty conditions. The obtained results proved the effectiveness of the DTC strategy with a fast dynamic, better load disturbances rejection and better tracking performance without overshoot when the FL speed controller employed, which ensures robust speed control under broken bars fault.