Dynamic characteristics of electro-mechanical transducer with multi-slit armature for high-speed on/off valve

High-speed on/off valves (HSVs) are widely used in the aerospace industry. The large eddy currents make it difficult to improve their response time, and the relationship between response time and various structural parameters such as armature diameter and spring preload is complex. To address this issue, the influence of eddy currents on the dynamic characteristics of HSVs is analyzed. Based on this, a multi-slit armature structure is designed to reduce eddy current loss, which can accelerate the opening and closing of the electro-mechanical transducer in HSVs. The effects of the interaction between armature diameter, coil turns, spring preload, and spring stiffness on the opening and closing characteristics of the electro-mechanical transducer are then analyzed. Subsequently, the correlation between each factor and the opening and closing times is quantified using grey correlation analysis. The results show that the multi-slit armature structure can reduce eddy current loss by 50.07% and shorten the opening and closing time by 15%. Moreover, it is found that spring preload has the highest correlation with closing time, while armature diameter is most correlated with reset time. These findings can serve as a basis for optimizing the structure of the electro-mechanical transducer and further improving the dynamic characteristics of HSVs.