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

Author

Listed:
  • Zheng Yan

    (Mechanics Institute, Jinzhong University, Jinzhong 030024, China)

  • Lei Ge

    (Key Laboratory of Advance Transducers and Intelligent Control System, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

  • Long Quan

    (Key Laboratory of Advance Transducers and Intelligent Control System, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

Abstract

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.

Suggested Citation

  • Zheng Yan & Lei Ge & Long Quan, 2022. "Energy-Efficient Electro-Hydraulic Power Source Driven by Variable-Speed Motor," Energies, MDPI, vol. 15(13), pages 1-19, June.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:13:p:4804-:d:852732
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    References listed on IDEAS

    as
    1. Pedro Javier Gamez-Montero & Piotr Antoniak & Robert Castilla & Javier Freire & Justyna Krawczyk & Jaroslaw Stryczek & Esteve Codina, 2017. "Magnet-Sleeve-Sealed Mini Trochoidal-Gear Pump Prototype with Polymer Composite Gear," Energies, MDPI, vol. 10(10), pages 1-18, September.
    2. Hongjuan Zhang & Lu Ren & Yan Gao & Baoquan Jin, 2017. "A Comprehensive Study of Energy Conservation in Electric-Hydraulic Injection-Molding Equipment," Energies, MDPI, vol. 10(11), pages 1-20, November.
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