Abstract
A significant development goal in the field of hydraulics is economizing energy. The higher the efficiency of a system, the lower the required installed input power is. Because less heat is lost, the effort required to cool the pressure medium is reduced. Aside from the reduced operation costs due to the lower energy consumption, one also saves investment costs by utilizing power in better ways. Displacement units in pumps and motors can provide energy economizing features.
Variable displacement pumps for open circuits are equipped with separate controllers for pressure, piston stroke, volume flow and power, in each case providing only as much power as the consumer requires.The controllers which are available on the market today are nearly exclusively mechanic-hydraulic systems. At the IHP, a systematic investigation of the possibilities which electrical circuits provide for pump control is being carried out.
