NDLI: Improved performance of linear induction launchers

Content Provider	IEEE Xplore Digital Library
Author	Balikci, A. Zabar, Z. Birenbaum, L. Czarkowski, D.
Copyright Year	1965
Abstract	This paper deals with the effect of parallel (rather than series) connection of the drive coils on the input voltage requirements, as well as on the energy utilization, of hypervelocity linear induction coil launchers fed by flywheel motor/generator sets. All of our previously published studies, 1987 to date, have dealt with series (rather than parallel) connected drive coils, which led to high input phase voltages and relatively low phase currents. In practice, the phase voltage per coil length should be kept below 30 kV/cm, the breakdown voltage of air. Furthermore, at any given time during the acceleration, the moving projectile (surrounded by a cylindrical sleeve) occupies only a portion of a barrel section length. When a parallel connection is used, the currents in the drive coils around the sleeve will be higher than the currents in the other coils in that section. That results in a greater accelerating force than in the series case, which leads to improved energy utilization. The simulation code used in our previously published work to predict the performance of a sectionalized, 3 kg projectile machine, was modified to obtain parallel-connection results for a similar machine. The paper describes the new drive-coil/pulse-generator configuration, explains the mathematical model, and provides graphs to compare the new results with those obtained previously with the series configuration.
Sponsorship	IEEE Magnetics Society
Starting Page	171
Ending Page	175
Page Count	5
File Size	305538
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coils Acceleration Projectiles Flywheels Induction motors Induction generators Low voltage Breakdown voltage Predictive models Mathematical model induction coil launchers Electromagnetic launchers hypervelocity launchers
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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