Abstract
The methods of improving the dynamic performance of high speed on/off solenoid valve include increasing the magnetic force of armature and the slew rate of coil current, decreasing the mass and stroke of moving parts. The increase of magnetic force usually leads to the decrease of current slew rate, which could increase the delay time of the dynamic response of solenoid valve. Using a high voltage to drive coil can solve this contradiction, but a high driving voltage can also lead to more cost and a decrease of safety and reliability. In this paper, a new scheme of parallel coils is investigated, in which the single coil of solenoid is replaced by parallel coils with same ampere turns. Based on the mathematic model of high speed solenoid valve, the theoretical formula for the delay time of solenoid valve is deduced. Both the theoretical analysis and the dynamic simulation show that the effect of dividing a single coil into N parallel sub-coils is close to that of driving the single coil with N times of the original driving voltage as far as the delay time of solenoid valve is concerned. A specific test bench is designed to measure the dynamic performance of high speed on/off solenoid valve. The experimental results also prove that both the delay time and switching time of the solenoid valves can be decreased greatly by adopting the parallel coil scheme. This research presents a simple and practical method to improve the dynamic performance of high speed on/off solenoid valve.
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Supported by Science Fund for Creative Research Groups of National Natural Science Foundation of China (Grant No. 51221004), National Natural Science Foundation of China (Grant No. 50805127), Fundamental Research Funds for the Central Universities of China (Grant No. 2011QNA4002)
KONG Xiaowu, born in 1975, is currently an associate professor at The State Key Lab of Fluid Power Transmission and Control, Zhejiang University, China. He received his PhD degree from Zhejiang University, China, in 2004. His research interests include electro-hydraulic proportional control technology and industrial robots.
LI Shizhen, born in 1988, is currently a graduate student at The State Key Lab of Fluid Power Transmission and Control, Zhejiang University, China. He received his bachelor degree on mechatronics from Kunming University of Science and Technology, China, in 2011.
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Kong, X., Li, S. Dynamic performance of high speed solenoid valve with parallel coils. Chin. J. Mech. Eng. 27, 816–821 (2014). https://doi.org/10.3901/CJME.2014.0513.091
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DOI: https://doi.org/10.3901/CJME.2014.0513.091