Ordnance – Accelerating
Patent
1987-04-06
1989-04-04
Bentley, Stephen C.
Ordnance
Accelerating
124 3, 318 38, F41F 102
Patent
active
048174947
ABSTRACT:
An electromagnetic launcher includes a plurality of electrical stages which are energized sequentially in synchrony with the passage of a projectile. Each stage of the launcher includes two or more coils which are arranged coaxially on either closed-loop or straight lines to form gaps between their ends. The projectile has an electrically conductive gap-portion that passes through all the gaps of all the stages in a direction transverse to the axes of the coils. The coils receive an electric current, store magnetic energy, and convert a significant portion of the stored magnetic energy into kinetic energy of the projectile by magnetic reconnection as the gap portion of the projectile moves through the gap. The magnetic polarity of the opposing coils is in the same direction, e.g. N-S-N-S. A gap portion of the projectile may be made from aluminum and is propelled by the reconnection of magnetic flux stored in the coils which causes accelerating forces to act upon the projectile at both the rear vertical surface of the projectile and at the horizontal surfaces of the projectile near its rear. The gap portion of the projectile may be flat, rectangular and longer than the length of the opposing coils and fit loosely within the gap between the opposing coils.
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Driga et al, Coaxial Electromagnetic Launchers, '86 Proceedings of Electromagnetic launch Technology, pp. 51-56.
Grob, Basic Electronics, 1984, pp. 288-290.
From IEEE Transactions On Magnetics, vol. MAG-18, No. 1, 01/82: (1) Fair, Harry Jr., "Electromagnetic Propulsion: A New Initiative", pp. 4-6; (2) Mongeau & Williams, Arc-Commutated Launcher, pp. 42-45; (3) Burgess, Cnare, Oberkampf, Beard & Cowan, The Electromagnetic .theta. Gun and Tubular Projectiles, pp. 46-59; (4) Snow, Dunbar, kubby, O'Neill, Mass Driver Two: A Status Report pp. 127-134.
Cowan, Cnare, Duggin, Kaye, and Tucker, "The Reconnection Gun", 3rd Symposium on Electromagnetic Launch Technology, Apr. 21-24, 1986, Published in IEEE Transactions or Magnetics, vol. MAG-22, No. 6 (Nov., 1986), pp. 1429-1434.
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From IEEE Transactions On Magnetics, vol. MAG-20, No. 2, 3/84: (1) Kolm & Mongeau, "Basic Principles of Coaxial Launch Technology", pp. 227-230 (2) Burgess & Cowan, Multistage Induction Mass Accelerator pp. 235-238 (3) McKinney and Mongeau, Multiple Stage Pulsed Induction Acceleration, pp. 239-242.
Bentley Stephen C.
Chafin James H.
Hightower Judson R.
Libman George H.
The United States of America as represented by the United States
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