Study of Electromagnetic Hysteresis Characteristic of High Speed on/off Valve and Optimization of Dynamic Response

doi:10.3901/JME.260504

Abstract

Abstract: High speed on/off valve(HSV) is a critical component in digital hydraulic system, requiring rapid response to switching signals for precise control of digital hydraulic system. However, its opening and closing process is inevitably affected by electromagnetic hysteresis, which prolongs the HSV’s response time. Through multi-physics coupling analysis and current-electromagnetic force experiments, a significant hysteresis relationship between driving current and output electromagnetic force, distinct from conventional B-H hysteresis, is found, and the hysteresis law between current-electromagnetic force is obtained. Results show that magnetic hysteresis and eddy currents hinder the magnetization and demagnetization processes of the electro-mechanical converter, causing the dynamic opening current to exceed the static opening current, and the dynamic closing current to fall below the static closing current. Additionally, larger excitation voltages result in greater differences between dynamic and static opening/closing currents but shorter response times. Furthermore, when the electromagnetic force generated by the initial flux of opening and closing gets closer to the critical opening and closing electromagnetic force, the difference between dynamic and static opening/closing currents is reduced, and the opening/closing response time is shortened. Under 24 V opening and -24 V closing voltages, regulating the initial current close to the static critical opening/closing current value of 1.04 A and 0.52 A, reduces the dynamic opening current from 2.92 A to 2.70 A, and prevents re-magnetization before the electromagnetic force decreases to the critical closing value. Based on the above conclusions, the developed control strategy can achieve a opening response time of 0.28 ms; and a closing response time of 0.32 ms after being tested on a sample valve.

Key words: high speed on/off valve, coupling analysis, electromagnetic hysteresis, dynamic performance, pre-excitation

CLC Number:

TH137

ZHONG Qi, CHE Yangyang, XU Enguang, MAO Yongxin, WANG Jun, HE Xianjian, YANG Huayong. Study of Electromagnetic Hysteresis Characteristic of High Speed on/off Valve and Optimization of Dynamic Response[J]. Journal of Mechanical Engineering, 2026, 62(10): 362-374.

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