Applications of photovoltaic
solar energy conversion are increasing, and among them are systems of electric motors coupled to solar cell arrays, such as for water pumping.
A study of the interaction of the photovoltaic converter and the electric drive is needed for these systems. This paper deals, therefore, with the performance of direct current motors-separate, series and shunt excitation. supplied from a solar cell array. The motor characteristics-current-speed and torque-speed at different solar radiation levels-were studied. Photovoltaic converter D.C. motor Solar cells LIST OF SYMBOLS completion factor electromotive force (e.y.f.) solar array current armature current shunt excitation current reverse saturation current photocurrent motor current solar array short circuit current motor starting current Boltzmann constant motor constants speed ideal no-load speed no-voltage speed electronic charge armature resistance shunt winding resistance resistance connected in parallel to R,, solar array series resistance series winding resistance absolute temperature motor electromagnetic torque load torque of water pump motor starting torque voltage solar array terminal voltage motor terminal voltage magnetic flux qlAkT