Dynamic Characteristics of a Spool Valve Coupled with Electromagnetic and Mechanical Effects

A spool valve as a flow direction control valve has usually been used in a hydraulic system. In recent years, some hydraulic actuator systems need high accuracy control of the spool valve in order to control the delivery precisely. For the reason, it is very important practically to know dynamic motion of the spool. To analyze the dynamic characteristics of the spool valve, it is necessary to consider the dynamic motion of the spool. Springs, solenoids and working fluid, which is pressurized by the pump in the circuit, support the spool. The motion of the spool is governed complicatedly by pressure force, flow force, electromagnetic force and mechanical spring force acting on itself. As a result, it is difficult to analyze the dynamic motion of the spool, and therefore, any commercial code to calculate the dynamic characteristics of the spool valve dose not exist at present. Final target of this study is to develop numerical code to predict precisely the dynamic motion of the spool valve. As the first step, dynamic characteristics of a spool valve coupled with electromagnetic and mechanical effects have been conducted in the present paper