20.500.12556/RUL-133677 Electro-hydraulic drive of the variable ratio lifting device under active load Elektrohidravlični pogon aktivno obremenjene dvigalne naprave z variabilnim razmerjem Hydraulic systems fed by fixed displacement pumps driven by frequency-controlled electric motors can replace conventional throttling systems due to their ability to control the speed of hydraulic cylinders regardless of the value and direction of the load. These systems can improve the energy efficiency of the drive or even provide the possibility of energy recuperation during lowering. This paper presents experimental studies of the new drive system with volumetric control of the speed of the lifted/lowered payload using the example of a scissor lift. The system uses a reversible gear pump driven by an asynchronous motor fed by a frequency inverter operating in field-oriented control mode. Comparative studies of the mapping of the assumed speed of the hydraulic cylinder and platform are presented, as well as studies of the influence of the load change on the speed and positioning of the mechanism driven by the open-loop controlled system. hydraulic drives speed controlled pumps variable-ratio device lifting systems hidravlični pogoni črpalka z nastavljivo hitrostjo naprava z variabilnim razmerjem dvigalni sistem true false true Angleški jezik Slovenski jezik Članek v reviji 2021-12-08 13:39:14 2021-12-08 13:39:18 2022-09-13 03:52:00 0000-00-00 00:00:00 2021 0 0 Str. 599-610 no. 11 Vol. 67 Nov. 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.22 0039-2480 10.5545/sv-jme.2021.7320 88437507 RAZ_Kosucki_Andrzej_2021.pdf RAZ_Kosucki_Andrzej_2021.pdf 1 064290009DFAA5900888186B13E8440D 395ab9dc1c10a455161989a45525af16b4749508fc777276d3ac8e0f0b5fb2af 8777ed2b-5824-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=151940 https://www.sv-jme.eu/sl/article/electro-hydraulic-drive-of-the-variable-ratio-mechanism-operating-under-active-load/ 0 91bd800a-5824-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=151941 Fakulteta za strojništvo Strojniški vestnik 0 0 0