Abstract
The electropneumatic proportional valve controls the airflow rates or pressure in proportion to the electric current by using a proportional magnet. The uniqueness of the magnetic field of the proportional magnet makes it difficult to predict or reproduce its performance due to an incorrect estimation of magnetic flux's saturation and leakage. In this paper, the magnetic field of the proportional magnet is clarified by making the contour lines of flux and flux density with the aid of the FEM magnetic analysis. Next, a three-way type pressure proportional valve is developed, which enables the controlling of the pneumatic pressure in proportion to the electric current of 0.9 MPa/0.8 A within a 30 ms response time with the flow capacity of 1.33x10-2 kg/s at 0.49 MPaAbs. The pressure proportional valve is applied to the position control of servocylinder, which demonstrates that the pressure control strategy improves the fluctuation of dynamic characteristics because of the control of the penumatic compliance.
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