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Abstract
The subject of this thesis is an attempt to introduce a direct and simple approach towards a high performance of a single-phase induction motor (SPIM), especially during starting period. This approach is based on continuously developing a maximum torque over all the starting period of the motor. For this purpose, an electronically controlled capacitor is used. It consists of an electronic switch connected in parallel with an a.c capacitor.
The function of this electronic switch is to switch on / switch off the capacitor periodically dependent on the motor speed. Consequently, the effective value of the capacitor will be improving the motor performance.
The great beauty of this approach is that, it can be practically realized simply, without any starting capacitor, nor centrifugal switch. Moreover, this practical system is sensor less and in the same time continuously connected, controlled and operated in on line.
A very simple and new algorithm is developed to maximize the torque cost function using SIMULINK toolbox provided by MATLAB programming package.
The simulation and analysis are performed at different types of power supplies, different capacitor cases and different loading conditions. The simulation results are discussed and analyzed.
A full practical hardware experiment including the necessary coupling, control and power circuits will be realized using a microcontroller for on line controlling the optimized technique. Both the simulation and practical results are compared, discussed and analyzed.