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Abstract
The excitation of the switched reluctance motor (SRM) phases needs to be carefully synchronized with rotor position to obtain an acceptable drive performance. Therefore,rotor position sensing is an integral part of the SRM drives control. Additionally, for precise torque and speed control applications, it is necessary to have rotor position information with reasonably good resolution and high degree of accuracy. Sensorless control methods are an attractive approach in which the rotor position is sensed indirectly without a discrete mechanical position sensor. Several research papers have been published on the sensorless control of SRM drives. Some of these methods are inductance based while others are flux based. Unfortunately, all of them were confined with the estimation to a limited range of speed. This thesis presents a sensorless control for a SRM which is valid for all speeds including zero speed. The accuracy and resolution of the proposed sensorless technique has been enhanced via a simple nonlinear model, which is based on finite element analysis (FEA) of SRM. Such a model can be successfully employed with observers for real time implementation. Moreover, the adaptive fuzzy logic PI controller is used with sensorless controller to improve the control behavior of SRM drive in terms of tracking precision and travel time. Finally, the experimental results are presented which the validity and effectiveness of the proposed method.