Abstract
A linear proportional solenoid (LPS) is an actuator for a proportional control valve used in hydraulic pressure-control devices. The LPS has the characteristics that the thrust must be constant in the designated range of displacement, and that it must be in proportion to the current. This paper deals with the simulation of the thrust-displacement characteristics of the LPS by means of FEM, with the aim of improving the thrust. In model P, where permendur of high-flux-density material was used for the stator and the mover in the LPS, the maximum thrust increased from 27 to 40 newtons. The range of constant thrust, however, decreased from 1.0 to 0.5 millimeters. In model S, where permendur was used for the stator and the mover, and the salient pole of the stator in the LPS was modified, the range of constant thrust was the same as in the present model. Moreover, the static thrust in the range of constant thrust increased from 27 to 38 newtons.
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