Helicoidal electromagnetic field for coilgun armature stabilization

In this paper, stabilization of an induction type coilgun inside the bore armature is considered. The projectile moves with a helicoidal motion and such a movement is obtained using a double-fed induction launcher furnished of two coils: the main one generates a traveling magnetic field providing, as a consequence, the axial motion, while the other one produces a rotating magnetic field that is responsible for the rotation. The aim of this work is to investigate the effects of the interference between the traveling and rotating magnetic fields on the in-bore armature stability.