Abstract
The electro-hydraulic servo pump control system (EHSPCS) is a volume control system that uses a permanent magnet synchronous motor (PMSM) with a fixed displacement pump to directly drive and control the hydraulic cylinder. The energy transmission law of the system is very complicated due to the transformation of electrical, mechanical and hydraulic energy as well as other energy fields, and qualitative analysis of the energy transfer efficiency is difficult. Energy transfer analysis of the EHSPCS under different working conditions and loads is proposed in this paper. First, the energy flow transfer mechanism was analyzed, and the mathematical and energy transfer models of the key components of the system were established to explore the energy characteristic state transition rule. Second, a power bond diagram model was built, its state equation and state matrix were deduced, and a system simulation model was built. Finally, combined with the EHSPCS experimental platform, simulation experiments were carried out on the dynamic position following and steady-state position holding conditions of the system, and the variation rules of the power of each energy characteristic state and the system energy transfer efficiency under different loads were obtained. The research results provide a foundation for the study of power matching and energy-saving mechanism of the EHSPCS.
Highlights
The electro-hydraulic servo pump control system (EHSPCS) adjusts the flow and pressure output of a fixed displacement pump by changing the speed and torque of a permanent magnet synchronous motor (PMSM), so as to realize high-precision control of the position and force of the hydraulic cylinder
The system simulation model was established by using a power bond diagram, and the energy transfer law under the two operating conditions of dynamic position following and steady-state position holding was studied on the simulated experimental platform, and the energy transfer efficiency of the EHSPCS was obtained
In the EHSPCS, the PMSM coaxially drives the fixed displacement pump, and the oil suction and oil pressure ports of the fixed displacement pump communicate with the load chamber of the hydraulic cylinder
Summary
The electro-hydraulic servo pump control system (EHSPCS) adjusts the flow and pressure output of a fixed displacement pump by changing the speed and torque of a permanent magnet synchronous motor (PMSM), so as to realize high-precision control of the position and force of the hydraulic cylinder. The energy transfer characteristics of a direct drive volume control electro-hydraulic servo system with long pipeline and hydraulic winch test bench were studied in [21,22] by using a power bond diagram. The above results studied the energy transfer characteristics of specific components of the hydraulic system, analyzed the mismatch between the drive and the load and the effect of oil temperature as the reasons for the low efficiency of the system, and proposed the control strategy and energy-saving system to reduce the energy loss, but lack of research on the energy transfer, transformation, storage and distribution of the entire EHSPCS. This paper takes EHSPCS as the research object, the energy flow conversion characteristics among the PMSM, fixed displacement pump, and hydraulic cylinder were analyzed and the energy transfer model of the system was established. The system simulation model was established by using a power bond diagram, and the energy transfer law under the two operating conditions of dynamic position following and steady-state position holding was studied on the simulated experimental platform, and the energy transfer efficiency of the EHSPCS was obtained
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