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

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