Abstract
In order to develop high performance electro-hydraulic proportional valve/electro-hydraulic servo proportional valve, the key objective is to develop high performance electro-mechanical converter (EMC) for driving proportional valve. (1) The structure scheme of moving coil proportional electromagnet (MCPEM) with special permanent magnet excitation is proposed. The research shows that the driving force of MCPEM based on special permanent magnet can be increased by more than 7% compared with that of cylindrical permanent magnet. MCPEM is designed as a pilot stage, and a prototype is manufactured. The dynamic and static characteristics of the prototype are tested. The experimental results verify the correctness of the design and calculation. It shows that the prototype can meet the pilot stage drive requirements of servo proportional valve with high performance and large flow rate. (2) The structure scheme of direct-drive electro-hydraulic proportional valve (DDV) composed of MCPEM is proposed. The main performance of the electro-hydraulic proportional valve with the proposed structure is analyzed. A prototype of MCPEM with large thrust and high performance is developed and tested. Experiments show that the static characteristics of the proportional electromagnet are very good. The step response time of the spool displacement of the controlled valve to 100% input signal is less than 15 ms within open-loop. The proportional valve has the advantages of high dynamic and static performance formed with this MCPEM. Several detailed design methods are provided for valve-using proportional solenoids and electro-hydraulic proportional valves, as well as the performance test methods of these solenoids and proportional valves. It has made a certain contribution to the development of electro-hydraulic proportional valves.
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