Downsizing the electric motors of energy-efficient self-contained electro-hydraulic systems by using hybrid technologies

Damiano Padovani*, Søren Ketelsen, Lasse Schmidt

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations

Abstract

The ongoing tendency toward the electrification of hydraulic systems, mainly in the form of self-contained solutions, poses design challenges in high-power applications. An electric motor drives positive-displacement machines used to control the motion of the hydraulic actuator (nonhybrid systems encompassing one or two pumps exist in the technical literature). All the power managed by the actuator passes through the electric motor, which leads to often oversized arrangements. These detrimental characteristics are especially pronounced when the power level increases approximately above 35-40 kW. Therefore, this research paper presents and studies a selfcontained, electro-hydraulic, hybrid architecture intended to downsize the electric motor while maintaining the high-power output of the nonhybrid counterpart. After introducing the sizing process for the energy storage device and developing a suitable control strategy for the hybrid subsystem, the proposed concept is validated via high-fidelity dynamic models. The rated power of the electric prime mover can be cut by 70% in the considered application (a mid-size, knuckle-boom crane with an installed power of about 46 kW) without altering the performance in terms of motion control. The additional mass (about 310 kg) of the hybrid system is not expected to affect the load-carrying capacity significantly. As a result, the hybridization of self-sufficient systems is technically feasible for high-power applications. Drawbacks related to the system cost-effectiveness might, however, be experienced. An application-driven cost analysis should be conducted before implementing such a solution.

Original languageEnglish
Title of host publicationBATH/ASME 2020 Symposium on Fluid Power and Motion Control, FPMC 2020
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791883754
DOIs
StatePublished - 2020
Externally publishedYes
EventBATH/ASME 2020 Symposium on Fluid Power and Motion Control, FPMC 2020 - Virtual, Online
Duration: 9 Sep 202011 Sep 2020

Publication series

NameBATH/ASME 2020 Symposium on Fluid Power and Motion Control, FPMC 2020

Conference

ConferenceBATH/ASME 2020 Symposium on Fluid Power and Motion Control, FPMC 2020
CityVirtual, Online
Period9/09/2011/09/20

Keywords

  • Displacementcontrolled actuators
  • Downsizing
  • Electro-hydraulic systems
  • Energy efficiency
  • Hybrid systems
  • Hydraulic cranes
  • Self-contained systems

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