New High Performance Electro-hydraulic Proportional Valve and Its Performance

doi:10.3901/JME.2020.04.233

Abstract

Abstract: Moving-iron proportional electromagnet is the mainstream electro-mechanical converter of electro-hydraulic proportional valve. Its electromagnetic force is not constant to the displacement of iron core. Constancing the force is one of the key jobs for researchers. And because of the existence of iron core, the coil inductance is very large, which is disadvantageous to improve the response speed of the circuit. In order to develop high-performance electro-hydraulic proportional valve / servo proportional valve, A high-performance moving coil proportional electromagnet has been developed based on the study of the moving coil proportional electromagnet and its related theories in the early study stage. A structural scheme of electro-hydraulic proportional valve composed of moving coil proportional electromagnet is proposed. The main performance of electro-hydraulic proportional valve based on the scheme is analyzed. The corresponding experimental research scheme of dynamic and static performance is proposed, and the structural scheme is studied with the test system. The research results show that the structural scheme of moving coil proportional valve that is developed has high dynamic and static performance. The proportional electromagnet has very strict constant force characteristics. The step response time of spool displacement to the 100% input signal is less than 15 ms in the open loop. The research results are beneficial to develop high performance electro-hydraulic servo proportional valve.

Key words: proportional valve, servo proportional valve, moving coil proportional electromagnet, characteristic testing

CLC Number:

TG137

XU Xiaoqing, QUAN Long, WANG Xuping. New High Performance Electro-hydraulic Proportional Valve and Its Performance[J]. Journal of Mechanical Engineering, 2020, 56(4): 233-238.

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