Matching analysis of photovoltaic powered dc series motors and centrifugal pumps by varing motor constants

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Abstract
An analytical method for the direct coupling between a photovoltaic (PV) generator and a monoblock DC series motor driven centrifugal pump has been developed as a function of the no-flow motor-pump speed w0 and its working speed w. w0 is a function of the motor terminal voltage, and w is determined by the value of w0 and the working water head of the pump. The different parameters of a monoblock DC series motor and a centrifugal pump have been derived as variables of w0 and w. The optimum matching conditions at the maximum hydraulic efficiency are discussed. The mathematical approach to this study has been verified by experimental results from two different pump systems. The constants of a given motor-pump system are constrained by the requirements and design factors. Without alteration of these constants, better matching can be achieved only by changing the motor constant M0. Some reported results also compare well with those of this model.