Numerical simulation and prototype experiment of integrated electrohydraulic pump

Sun, Fengrui; Ji, Hong; Yan-bo, Peng; Chen, Li

doi:10.1177/09544062221076982

Cited by 5 publications

(5 citation statements)

References 17 publications

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“…19 Nishanth et al 20 summarized different EM thermal management strategies and their corresponding allowable EM current densities. Fei et al 21 have demonstrated the use of hydraulic fluid to immersion cool the EM effectively in an integrated EHU design architecture. The maximum allowable current density of 20 A/mm 2 is assumed based on Ponomarev, 19 but the actual cooling architecture is not within the scope of this paper.…”

Section: Ehu Design Methodologymentioning

confidence: 99%

Design methodology for an integrated axial piston-type electrohydraulic unit

Sarode

Shang

Vacca

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper proposes a design methodology for power-dense and high-efficient electrohydraulic units (EHUs) that can be used to select design specifications for the electric machine (EM) for a given hydraulic machine (HM) architecture. The proposed method evaluates EHU performance considering both electric and hydraulic power losses. The compactness of the EHU is achieved by integrating an axial piston unit as HM inside a permanent magnet EM. The paper provides a sensitivity analysis for important EHU design specifications and discusses the best choices for reducing total mass and energy loss. The study finds that greater aspect ratios promote power-to-weight ratio, while high voltage promotes energy efficiency. The paper also discusses the choice of fixed versus variable displacement HMs, with the finding that a variable displacement unit helps address low efficiency limits of low-speed operation, particularly for low voltage electric machines. Additionally, variable displacement can also be used to reduce EM losses when meeting a flow-pressure demand. The proposed methodology has applications in fields such as off-road vehicles.

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Section: Ehu Design Methodologymentioning

confidence: 99%

Design methodology for an integrated axial piston-type electrohydraulic unit

Sarode

Shang

Vacca

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Commands are edited in the Simulink software embedded in dSPACE and the input/output parameters are also computed and controlled in the software. 27 A proportional pressure valve in an outlet port of the pump protects the system pressures and a proportional direction valve as a loading valve adjusts opening capacities and directions to realize system loadings. The industrial personal computer sets a pressure signal to servo controller to control servo motor speeds.…”

Section: Working Principles Of the Electrohydraulic Power Sourcementioning

confidence: 99%

Characteristics of high energy-efficient Electro-hydraulic power source driven by servo motor and variable pump

Yan

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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An electro-hydraulic power source is a unit that provides power for a hydraulic system, whose energy efficiency determines the whole system’s energy efficiency. The electro-hydraulic variable displacement proportional pump has the disadvantages of bad controllability, slow dynamic response in low-pressure condition, and high energy consumption in its non-working period (due to its electric motor still running at a rated speed). The electro-hydraulic variable displacement pump has some drawbacks regarding bad controllability. Aiming the above problems, a new electro-hydraulic power source based on pressure-controlled variable piston pump driven by a servo motor is developed in this paper. The pump’s output pressure can be continuously controlled without throttle losses through changing a swash-plate angle of the pump, and the output flow can be continuously controlled by changing motor speeds. A simulation model is established based on the mathematical models of pressure-controlled pump and servo motor, and the characteristics of its constant pressure control and constant flow control are discussed. A test bench is built to study its characteristics of pressure control, flow control, and energy efficiency. The results show that: (1) the proposed power source can realize the pressure control of the system, the direct open-loop control performance of the electro-hydraulic pilot valve is better than that of the speed-variable proportional-integral closed-loop control; (2) the leakage caused by load pressure change can be supplemented by speed and the control accuracy error is lower than 0.2%; (3) under the situation of pressure maintaining without flow outputs, pressure unloading and constant pressure control operating, through controlling the motor speed, the energy consumption of the power source can be reduced by almost 30% compared to a traditional power source.

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“…Another instance of this trend was reported in paper [21], in which a hollow shaft centrifugal pump structure was designed by trying to determine the characteristics of pressure change in the suction chamber of the displacement pumps. Fortunately, the experimental and simulation results validated the feasibility of this solution.…”

Section: Introductionmentioning

confidence: 99%

“…In the present study, all computational fluid dynamic models and simulation calculations were carried out with the commercial software PumpLinx, a specialized software for predicting the theoretical performance of the pumps, the calculation results and accuracy of which have been proven reliable by numerous cases [10,15,21,22].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Pairing Solutions of Non-Positive Displacement Pumps and Internal Gear Pump for High-Speed Design

Sun

Yang

et al. 2023

Fluids

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Raising the working speed of hydraulic pumps to maximize the efficient matching range of electric motors is one of the possible ways to achieve energy efficiency in electric machinery. By means of a simulation method verified with subsequent experiments in terms of filling efficiency, this paper first analyzed the suction capacity of crescent-type internal gear pumps with different geometric parameters at high speed, and the gear pair that is more suitable for high-speed operation was obtained. Subsequently, as the more significant contributions, two pairing solutions of a non-positive displacement pump and an internal gear pump were proposed to pressurize the inlet of the gear pump to keep it from cavitating. In the compact design solution, the inclined-holes type and axial-flow blade pumps share the same speed as the hydraulic pump, while the decentralized layout solution allows for flexible adjustment of the centrifugal impeller-type pump speed to maximize the filling capability. The final simulation results show that, with the help of inclined-holes type and centrifugal impeller type pumps, the filling efficiency of the internal gear pump at 6000 rpm can be improved by 3.59% and 5.84%, respectively, while the axial-flow blades pump fails to eliminate cavitation regardless of speed. Moreover, when the hydraulic pump works at 6000 rpm, the centrifugal impeller speed needs to be set above 2500 rpm to make sense.

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Numerical simulation and prototype experiment of integrated electrohydraulic pump

Cited by 5 publications

References 17 publications

Design methodology for an integrated axial piston-type electrohydraulic unit

Design methodology for an integrated axial piston-type electrohydraulic unit

Characteristics of high energy-efficient Electro-hydraulic power source driven by servo motor and variable pump

Numerical Investigation on Pairing Solutions of Non-Positive Displacement Pumps and Internal Gear Pump for High-Speed Design

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