Abstract
In many heavy machines, the use of high force drives is required. For such tasks, electrohydraulic servo drives with proportional valves are used most often. In these valves, the proportional electromagnets are applied. If high precise control is additionally required, it is necessary to use expensive servo valves or precise stepping motors. In this paper, the application of a valve with one (or with two) stepping motors in the electrohydraulic servo drive is described. Such motors may work in a micro-step mode, which enables the precise positioning of the valve spool with low energy consumption. The control system structure that was used for positioning, consisting of such an electrohydraulic servo drive with a valve having stepping motors, is described. In the investigations, the following control parameters are considered: the number of stepping motors used, proportional gain coefficients, supply pressure, and desired step distance. The simulation model of the servo drive is proposed, enabling the investigations of energy consumption during the positioning process. In the investigations, the drive step responses are recorded and compared, taking into account the rise time and energy consumption. The overshot-free algorithm is used in the following step and tested in positioning tasks. The collected results of energy consumption of the drive during the positioning process are compared with other solutions.
Highlights
Fluid power drives are able to generate very large forces measured in thousands of kN
This valve enables obtaining both low with two stepping motors is considered in more detail
The equations proposed in this paper can be used in simulation models to determine and record the valve energy consumption over time
Summary
Fluid power drives are able to generate very large forces measured in thousands of kN. They are used in many heavy industrial machines to form thick, tough metals. Electrohydraulic drives are applied for lifting and lowering elements with high masses, reaching many tons. Another area of their applications is mobile working machines used for example in the mining industry or in robotic excavation devices. An electrohydraulic servo drive system consists of a hydraulic power supply, control element (valve, sensor, controller), actuator (cylinder, motor) and connection elements (pipelines). There are three main concepts of the construction of linear electrohydraulic drives [1,2,3]:
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
