Abstract
This paper investigates energy efficiency and dynamic behavior through simulation and experiments of a compact electro-hydrostatic actuator system (EHA) consisting of an electric motor, external gear pump/motors, hydraulic accumulator, and differential cylinder. Tests were performed in a stand-alone crane in order to validate the mathematical model. The influence and importance of a good balance between pump/motors displacement and cylinder areas ratios is discussed. The overall efficiency for the performed motion is also compared considering the capability or not of energy recovery. The results obtained demonstrate the significant gain of efficiency when working in the optimal condition and it is compared to the conventional hydraulic system using proportional valves. The proposed system presents the advantages and disadvantages when utilizing components off-the-shelf taking into account the applicability in mobile and industrial stationary machines.
Highlights
Off-road machines and industrial stationary applications have a huge growth potential with respect to energy savings
The combination of electric and hydraulic components in a closed circuit defines the concept of electro-hydrostatic actuator systems (EHAs)
Using the validated the system is analyzed in termsdisplacements of consumed delivered power, as well asmodel energypresented efficiency.above, The influence of ratio between pump/motor and cylinder deliveredareas power, as discussed
Summary
Off-road machines and industrial stationary applications have a huge growth potential with respect to energy savings. EHAs can be driven utilizing three different configurations: Fixed displacement pump and variable speed electrical motor, variable displacement pump and fixed speed motor, and both variable The latter can provide the highest energy efficiency, the cost is higher and it requires more complex control systems in order to achieve maximum efficiency regardless of the hydraulic operation point [2,3]. The concept based on the fixed displacement pump and variable speed electrical motor can offer the lowest manufacturing costs, simplicity, and high efficiency. Differential cylinders are mostly employed in construction machines due to requirements of output force and installation space When these actuators are utilized, the inflow and outflow are not balanced, affecting the accuracy in the actuator position, control performance, and energy efficiency.
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