Study on Structure Optimization of Proportional Solenoid Pole Shoe Based on Taguchi Method
Proportional electromagnet acts as the most critical electro-mechanical converter in proportional valve.The intelligent electro-hydraulic control system accuracy depends on the displacement-force linear level.However,the proportional electromagnets generally exist the problems of poor linearity of displacement-force and low accuracy of proportional conversion.To solve such problems,the displacement-force linearity of proportional electromagnet is taken as the optimization objective and carried out in combination with Taguchi method.Firstly,the mathematical model of the output electromagnetic force of the proportional electromagnet is established,and the mapping relationship between the displacement-force characteristics and the structural parameters of the pole shoe is clarified.Secondly,based on the numerical results of the output electromagnetic force of different pole shoe structure parameters at four typical positions of the armature(0,d/4,d/2,d,d means the armature stroke length),the optimal combination of the key structural parameters of the proportional electromagnet is obtained through Taguchi method.Finally,the prototypes of the proportional electromagnet are manufactured,and the variance of the displacement-force linearity before and after optimization is compared.The results show that the displacement-force linearity of the optimized proportional electromagnet is increased by 15.56％,which verifies the correctness of the simulation model and the feasibility of the research method.The research results provide significant guidelines for electromagnetic performance improvement of proportional electromagnet used for intelligent hydraulic systems.
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