Abstract
Proportional solenoid is a key electromechanical control device in hydraulic control valves. Its function is to convert electrical energy into linear mechanical motion. Because it has linear proportional relation between output force and input signal, it is named by the word "proportional". Therefore, the performance of the solenoid directly affects the static and dynamic characteristics of proportional valve. The objective of this thesis is to study the factors that affect the output thrust of the propoptional solenoid and the control ranges of constant thrust. Based upon the physical phenomena, mathematical models and design parameters of proportional solenoid are established. Commercial software for finite element analysis is employed for computing the flux and force distribution of proportional solenoid. Then, simulations and factors analysis that affect the performances of proportional solenoid are done. From the simulation results, factors that affect the range and magnitude of constant shrust are found. And these results are very useful for designing the proportional solenoid.