We present the results of an analytical study aimed at characterizing the critical parameters affecting the mutual inductance M between Rogowski coils and primary conductors. The analysis is based on the method of the mutual partial inductances and it is applied to various case studies. Calculations are carried out for Rogowski coils having a few turns, hundreds, and even thousands of turns with uniform and nonuniform windings. We also provide the results of an experimental analysis performed on a Rogowski coil with a small number of turns for comparison with the proposed technique
The aim of this paper is to study the problem of gyroscopic stabilization of the launch package in induction type coilguns. This result can be obtained by utilizing a double-feed induction coilgun which provides rotation to the launch package while it is accelerating. Such launcher is comprised of two coils, one generating a travelling magnetic field (and consequently the axial acceleration) the other a rotating magnetic field for the rotation of the projectile. Electromagnetic analysis, based on a cylindrical sheet current model, allows one to determine, as a function of the two slips (in the translation motion and in the rotation motion) all the electric, magnetic and mechanical quantities. Thermal and mechanical stress are determined too. Finally the results for a launcher, in which a 2 kg projectile is accelerated, are reported. For this application time dependence of the principal electromechanical quantities are shown. A comparison with the same launcher running as a linear induction launcher is developed too.Index Terms-Gyroscopic stabilization of the projectile, induction coilgun.
This paper presents two new strategies to provide
gyroscopic stabilization for armatures launched by railgun
launchers. The rotating motion of the projectile is obtained by
means of an electromagnetic field or, alternatively, of an
appropriately shaped bore. In the first case windings, coiled in
the bore axis direction, generate a rotating magnetic field. The
interaction between the field and the conducting sleeve implies a
rotation of the latter. The mechanical solution consists in a
helicoidally extruded square bore launcher. In this way, the
projectile moves along the main axis and it rotates at the same
time. Results of a theoretical analysis are reported and the
feasibility of both techniques is discussed
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.