Next Article in Journal
A Dual Half-Bridge Converter with Adaptive Energy Storage to Achieve ZVS over Full Range of Operation Conditions
Next Article in Special Issue
Global Energy-Optimal Redundancy Resolution of Hydraulic Manipulators: Experimental Results for a Forestry Manipulator
Previous Article in Journal
Comparison of Impulse Wave and Sweep Frequency Response Analysis Methods for Diagnosis of Transformer Winding Faults
Previous Article in Special Issue
GeroMAG: In-House Prototype of an Innovative Sealed, Compact and Non-Shaft-Driven Gerotor Pump with Magnetically-Driving Outer Rotor
Article Menu
Issue 4 (April) cover image

Export Article

Open AccessArticle
Energies 2017, 10(4), 445;

Performance of an Energy Efficient Low Power Stepper Converter

Institute of Machine Design and Hydraulic Drives, Johannes Kepler University Linz, Altenberger Strasse 69, 4040 Linz, Austria
Author to whom correspondence should be addressed.
Academic Editor: Andrea Vacca
Received: 21 February 2017 / Revised: 17 March 2017 / Accepted: 22 March 2017 / Published: 28 March 2017
(This article belongs to the Special Issue Energy Efficiency and Controllability of Fluid Power Systems)
Full-Text   |   PDF [4901 KB, uploaded 28 March 2017]   |  


This paper presents the development of an energy efficient low power stepper converter. A prototype with a hydraulic output power of ≈600 W was designed, manufactured, investigated and improved. The converter consists of a hydraulic cylinder piston unit controlled by a fast switching valve to displace a defined fluid quantum by the limited forward stroke of the piston in its cylinder. The displaced fluid generates a precise, incremental motion of a load cylinder which should be controlled. Energy saving is achieved by storing the pressure surplus intermediately in the kinetic energy of the piston to displace a part of the fluid quantum without hydraulic energy from the supply line. Energy recuperation can be done in a similar way. Simulations and experiments showed two main efficiency improvement measures of the first converter prototype. The weak points were the commercially available check valves and the used guidance system for the pistons. The second part of the paper reports about the development of a fast check valve and of a combined hydrostatic hydrodynamic bearing system based on the elastic deformation of plastics. The theoretical and experimental results show a significant improvement of the energy efficiency, the potential of this drive technology and further improvement potential. Expressed in terms of numbers an energy efficiency increase compared to a resistance control up to 30% and a maximum recuperation energy efficiency over 60% were measured. View Full-Text
Keywords: hydraulic stepper converter; hydraulic stepper drive; resonance converter hydraulic stepper converter; hydraulic stepper drive; resonance converter

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Gradl, C.; Scheidl, R. Performance of an Energy Efficient Low Power Stepper Converter. Energies 2017, 10, 445.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top