A reciprocating pump includes a drive section and a pump section. The
drive section has a reciprocating coil assembly to which alternating
polarity control signals are applied by a reciprocating circuit during
operation. A permanent magnet structure of the drive section creates a
magnetic flux field which interacts with an electromagnetic field
produced during application of the control signals to the coil. Depending
upon the polarity of the control signals applied to the coil, the coil is
driven in one of two directions of movement. The reciprocating circuit
employs a storage capacitor and several switches to capture the energy of
the reciprocating coil as the pump is driven downwardly. The charge is
recycled as the capacitor dissipates, thereby reversing the polarity of
the current through the coil and driving the coil assembly upwardly to
its initial position. A drive member transfers movement of the coil to a
pump element which reciprocates with the coil to draw fluid into a pump
chamber and expel the fluid during each pump cycle. The pump is
particularly well suited to cyclic pumping applications, such as fuel
injection systems for internal combustion engines.