Three parameters optimization of acting force of DC electromagnet

The paper proposes an optimized geometry for a DC electromagnet combining the experimental design (DOE) and FEM. The optimization problem takes into account three geometrical parameters (coil shape ratio, support thickness ratio and support height ratio) and consists in maximization of the acting force related to the largest air-gap, preserving the global dimensions of the device (external radius, height of carcass, height of plunger with support) and the cross-section of the coil. The method by zooms without computation of models was applied to increase with 3.17% the acting force related to the airgap of 41 mm. The determination of the electromagnetic force was made by the Maxwell Stress Tensor technique implemented in FEMM software.