Accession Number : ADD013755
Title : Muzzle Arc Suppressor for Electromagnetic Railgun.
Descriptive Note : Patent, Filed 14 Jan 87, patented 29 Mar 88,
Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC
Personal Author(s) : Oberly, Charles E
Report Date : 29 Mar 1988
Pagination or Media Count : 6
Abstract : This patent discloses a muzzle arc suppressor allowing rapid repetitive refiring of railguns. A varistor or varistors electrically connect the muzzle ends of a railgun. Resistive inserts are placed inside the rails near the muzzle end. When the railgun projectile reaches the resistive inserts, the voltage across the varistor increases to above the varistor breakdown voltage, thereby commutating the railgun current from the projectile to the varistor, and dissipating excess magnetic energy through resistance heating of the varistor. The varistor is preferably made of zinc oxide, which temperature invariant over a wide temperature range. The varistor may be pre-cooled to increase its energy absorption ability. A specific embodiment of the arc suppressor has the zinc oxide varistor conformably shaped to surround the rails. The conformably shaped varistor includes coolant passages.
Descriptors : *HYPERVELOCITY GUNS, *SUPPRESSORS, *ELECTRIC ARCS, *PATENTS, *BREAKDOWN(ELECTRONIC THRESHOLD), *ELECTRONIC SWITCHES, ELECTROMAGNETISM, ENERGY, GUN MUZZLES, HEATING, INVARIANCE, MAGNETIC FIELDS, PROJECTILES, RAILS, RANGE(EXTREMES), RESISTANCE, TEMPERATURE, VARISTORS
Subject Categories : Electricity and Magnetism
Distribution Statement : APPROVED FOR PUBLIC RELEASE