Study on High Dynamic Variable Speed Hydraulic Control System

Shen, Hai; Nie, Meng; Zhi, Shao Dan; Jin, Bo

doi:10.4028/www.scientific.net/amm.271-272.625

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…Additionally, it is difficult to control the system pressure by only controlling the speed of the hydraulic pump, due to the unknown requirement of flow rates. When a variable-displacement pump is used, the dynamic response of the pump can make up for the lack of dynamic response of the electric motor, and the speed of the motor can be efficiently used to increase the energy efficiency of the power source [11][12][13][14][15][16]. However, due to the large inertia of the electric motor and hydraulic pump, the main disadvantage of the variable-speed system is a slow response, especially when the electric motor starts with full load or heavy load.…”

Section: Introductionmentioning

confidence: 99%

Energy-Efficient Electro-Hydraulic Power Source Driven by Variable-Speed Motor

Yan

Quan

2022

Energies

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Hydraulic systems are widely used in industry due to their small size-to-power ratios and their ability to produce very large linear force and torque. In traditional hydraulic systems, a variable pump driven by an electric motor is often used as power source. In these systems, the electro-hydraulic power source always operates at its rated speed, causing lots of noise and low energy consumption, especially in no-load and light-load conditions. These problems can be solved by changing the speed of the electric motor according to the load state of the electro-hydraulic power source. In order to improve the energy efficiency of the electro-hydraulic power source and realize pressure and flow control on the basis of low cost, this paper presents the power-source structure of a variable-displacement pressure-compensated pump driven by a variable-speed electric motor; this controls the flow by adjusting the electric motor speed and controls the pressure with the variable-displacement pressure-compensated pump. However, for the variable-speed system, the starting of the electric motor with a load is relatively slow; this makes it difficult to meet the demand of flow control, and will also have a great impact on the power grid. To address these problems, a hydraulic accumulator is introduced to the inlet port of the hydraulic pump to assist in starting the pump. This method can realize the combined control of pressure, flow and power, and has high energy efficiency. This research uses experiments to verify the feasibility of the scheme, and the results show that the starting periods of the power source can be shortened from 2.8 s to 0.7 s when the load pressure is about 18 MPa. Furthermore, regarding maintaining pressure without flow outputs, the energy consumption of the designed power source can be reduced by almost 30% compared with a pure variable-displacement power source.

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Section: Introductionmentioning

confidence: 99%

Energy-Efficient Electro-Hydraulic Power Source Driven by Variable-Speed Motor

Yan

Quan

2022

Energies

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Research on the rotational inertia of radial piston pump and the optimization method of the pump parameters

Guo

Zhao

Han

et al. 2014

11th IEEE International Conference on Control &Amp; Automation (ICCA)

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This paper aims to propose a method of optimizing the structure of radial piston pump from the aspect of reducing the rotational inertia. A modeling method based on basic dimensions and scale factors is developed. By using this method, three different types of radial piston pumps are studied. And the relative rotational inertia coefficient is adopted to evaluate the difference among them. Further study states that the relative rotational inertia coefficient changes along with the eccentricity ratio and the thickening factor. Finally a criterion is obtained, which could be used to optimize the structure and the dimensions of radial piston pumps.

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Study on High Dynamic Variable Speed Hydraulic Control System

Cited by 2 publications

References 6 publications

Energy-Efficient Electro-Hydraulic Power Source Driven by Variable-Speed Motor

Energy-Efficient Electro-Hydraulic Power Source Driven by Variable-Speed Motor

Research on the rotational inertia of radial piston pump and the optimization method of the pump parameters

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