Abstract: Aiming at the problem of improving the performance of electromagnet components in thread cartridge solenoid valve, taking an electromagnetic directional valve as an example, the main structure affecting the magnetic circuit was analyzed and improved. By using the principle of magnetic circuit, the structural factors 
which affected the magnetic circuit and suction characteristics were analyzed. The Maxwell finite element analysis model of the valve was established. Based on the model, the influence of coil shell thickness, magnetic breaking thickness, armature angle and magnetic ring on the electromagnetic suction characteristics were simulated. The influence of each structural parameter on the suction of the maximum working air gap and stroke force curve was mainly analyzed. According to the simulation results, each structural parameter was analyzed and improved, and a comprehensive improved model was proposed. The results indicate that the comprehensive model improves the suction characteristics of the electromagnet in thread cartridge solenoid valve, not only increases the suction at the maximum working air gap by about 30%, but also reduces the suction at the closing position by about 50%, which improves the phenomenon of rapid increase of suction during closing, makes the reversing process of the directional valve more stable, and better meets the working requirements of the directional valve.

Key words: threaded cartridge solenoid directional valve;electromagnet;finite element analysis;suction characteristics;stroke force curve