High efficiency, long life actuator for PV water pumping applications

In practise, a typical diaphragm configuration photovoltaic (PV) water pumping system consists of a DC permanent magnet motor driving a diaphragm pump via a cam. The typical efficiency is low and its life span short compared to that of the average solar cell. A better solution to the problems of low cost PV water pumping systems with low flow rates is introduced. The use of a linear DC motor or actuator as drive is suggested. A higher efficiency and life expectancy can be achieved for it has less friction and no cam losses. The aims of the project were to establish the required thrust force and stroke length, evaluate possible electromagnetic configurations by making use of a finite element analysis (FEA) package and finally to evaluate different electromechanical options. The results obtained for these criteria discussed concluding with a choice of the best topology