Optimization of DC electromagnet using design of experiments and FEM
In this paper is proposed an optimized solution of DC electromagnet using design of experiments (DOE) and FEM. Before optimization, the technique of screening was applied to determine the most influent geometrical parameters on the static force characteristic. For this purpose, the response function was chosen to be the root square of the average of squares of the relative force for five values of the air gap, uniformly distributed on the range. From three parameters taken into account, the coil shape ratio and the support thickness ratio were found having the best influence as well as their interaction. The optimization problem is the maximization of static force characteristic maintaining the global dimensions of electromagnet (external radius, height of carcass, height of plunger with support) and the cross section of the coil. To solve the optimization problem, the method by zooms without computation of models was used. The optimal solution brings a gain of 3.00% in static force for air gap of 36 mm and an average gain of 1.12% in static force related to the whole range of the air gap. These values were strongly limited by the equality constraints. The numerical experiments were performed using FEMM software and the magnetic force was computed using the Maxwell Stress Tensor approach.
2016 International Conference on Applied and Theoretical Electricity (ICATE)