オンオフ電磁弁による流量制御

概要

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In this paper, the motion of the spool and the flow rate of a spring return solenoid valve drived by PWM method have been analyzed theoretically and experimentally. The conditions to get the desired relationship between the flow rate and the pulse duty cycle have been predicted and these conditions have been confirmed by experiments. The obtained results are summerizd as follows : 1) In order to get the proportional flow rate corresponding to the pulse duty cycle, it is necessary that the solenoid thrust decreases and the spring force increases when the spool displacement increases. 2) In order to get the on-off flow rate characteristics, it is necessary for them to increase with an increase of the spool displacement. 3) Increasing the exciting pulse frequency, the proportional flow rate characteristics approaches to the on-off flow rate characteristics. In a practical valve used in experiment, the proportional characteristics were kept untill 50 Hz of the pulse.
岡山理科大学の論文