Effect of geometry change on the current density distribution in C-shaped armatures

Abstract

High-current densities in the armature of an electromagnetic launcher can lead to high local temperature and consequent loss of strength and even melting and erosion. In this paper, we examine if the peak current density distribution can be made more uniform by altering the armature geometry. Finite-element analyses using Electromechanical Analysis Program in Three Dimensions (EMAP3D) showed how the current is distributed in a baseline C-shaped armature. By curving surface edges and strategically adding and subtracting material from the original armature, a new model was constructed that had a better current density distribution. Thus, altering the armature design could lead to reduced possibility of transition in the electromagnetic gun.