Some remarks on the current filament modeling of electromagnetic launchers

Current filament models have been widely used for the electromagnetic analysis of induction launchers and electromagnetic devices. Two functions of the eigenvalues of the filament parameter matrix were determined in order to evaluate the errors on the system solution induced by approximate calculations of the matrix parameters and the influence on the solution of a variation of the filament number of the discretization. These functions allow an estimate of the solution convergence and accuracy, avoiding the numerical or analytical integration of the differential equation set of the system. The launcher has been modeled by means of a coordinate system coherent with the moving armature, with the hypothesis of piecewise constant velocity of the armature, in order to have no time-dependent elements in the system matrix.<
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