Abstract
The Linear Proportional Solenoid (LPS) is an actuator for a proportional control valve used in hydraulic pressure-control devices. The LPS has the basic characteristics that the thrust must be constant in the designated displacement range and must also increase in proportion to the exciting current. This paper deals with the effect of using dither to remove hysteresis phenomena, and numerical solutions of the thrust, F, the displacement, x, Which are characteristics of the LPS. Dither is a useful oscillation of small amplitude, introduced to overcome the effect of hysteresis. When dither is applied, the maximum hysteresis of the thrust is decreased from 6% to 3%. The LPS consists of four different magnetic materials, and its F-x characteristic was calculated by means of the Finite Element Method (FEM). The calculated value of the F-x characteristics approximates the measured value within an error of 2%. A new proposal for the LPS, Which will give it a wider range of thrust constant, is also described in this paper.
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