KOLLMORGEN Develops Ready Made Drive Solutions For Hydraulics

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KOLLMORGEN has developed a ready made drive solution for hydraulics applications for the S700 series’ servo drives. The new technology improves the energy efficiency of applications that need the high power density associated with hydraulics. Two other benefits are control precision and longevity. The pressure and volume flow control for hydraulic applications is generally achieved with the help of variable displacement pumps. Standard solutions use comparatively primitive asynchronous motors for this, which drive the variable displacement pumps.

By contrast, the KOLLMORGEN solution copes with the varying pressure and flow rate requirements associated with hydraulic applications thanks to the speed of the synchronous servo motor—so not by means of valves. The S700 servo drive assumes control of the two parameters in conjunction with the synchronous servo motor and a fixed displacement pump. The set-up associated with this servo drive solution devised for hydraulics applications envisages that the S700 intelligent servo inverter will assume control on a self-sufficient basis.

The control system connected via field bus or analogue signal only specifies the values for pressure and volume, with the servo drive then ensuring precise compliance with these through the speed. “With a sampling rate of 16 kHz, we are able to achieve fast and precise control of speeds, which gives ideal values for pressure and volume purposes,” explained KOLLMORGEN Development Engineer Georg Jaskowski. The software in the S700 servo drive also opens the possibility of efficiency compensation due to higher pump speeds.

The main benefits of so-called electro hydraulics are the diverse range of possible uses, with no need to settle for less (in terms of whether the hydraulics within a process area are provided by a central unit). Cables are also easier to lay than the pressure lines used for hydraulics. In addition, the compact units work with far less hydraulic oil and are only in active operation when the connected process actually requires hydraulic power too. By contrast, centralised systems always need to maintain operating pressure particularly in production processes where hydraulic axes are working as a group with time delays involved.

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