NDLI: Research progress in the development of a high-efficiency, medium-caliber helical coil electromagnetic launcher

Content Provider	IEEE Xplore Digital Library
Author	Engel, T.G. Nunnally, W.C. Neri, J.M.
Copyright Year	2004
Description	Author affiliation: Coll. of Eng., Univ. of Missouri-Columbia, Columbia, MO, USA (Engel, T.G.; Nunnally, W.C.)
Abstract	Research progress in the development of a 40 mm /spl times/ 750 mm, high-efficiency helical-coil electromagnetic launcher (i.e., HCEL) is presented and discussed. Significant technical problems that have been solved in this research include efficient stator commutation methods and the ability to implement high inductance gradient armatures. The HCEL is able to launch a 500 gram projectile to a velocity of 118 m/s. Power for the HCEL is derived from a 60 kJ sequentially-fired pulse forming network of 900 V electrolytic capacitors, typically operating at a voltage of 600 V. The experimentally measured HCEL efficiency of 13.5% is many times greater than a conventional or augmented railgun operating at equivalent mass, bore-size, and velocity. The results of experimental tests to achieve 30% launch efficiency are also discussed. These HCEL's high launch efficiencies are a direct result of its 150 /spl mu/H/m inductance gradient, which is 200 times greater than conventional railguns. HCEL computer models and their use is presented and analyzed. Theoretical and experimentally measured values are compared in the analysis, including peak current, inductance gradient, acceleration time, parasitic ratios, and electrical-to-mechanical efficiency. Scaling relationships for the HCEL are also presented and used to predict launcher operation at higher velocity and with larger projectiles. The results of lifetime tests and material erosion studies are also presented and discussed. The conclusions are the HCEL is a long-lifetime and efficient electric launcher.
Starting Page	49
Ending Page	52
File Size	1423069
Page Count	4
File Format	PDF
ISBN	0780382900
DOI	10.1109/ELT.2004.1398045
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-05-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coils Inductance Power measurement Pulse measurements Projectiles Capacitors Voltage Electromagnetic launching Stators Railguns
Content Type	Text
Resource Type	Article

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