NDLI: Determining pulsed alternator thyristor converter firing angles to produce a desired launcher current

Content Provider	IEEE Xplore Digital Library
Author	Mallick, J.A. Crawford, M.
Copyright Year	1965
Abstract	Proposed electromagnetic launch systems using pulsed alternators usually employ a phase-angle-controlled thyristor converter to supply dc to the railgun launcher. By carefully choosing the firing angles of the individual thyristors, the system designers can control shape of the current pulse delivered to the launcher, thereby controlling projectile acceleration and magnetic energy recovery from the launcher after muzzle exit. This paper describes a simple method for determining the required phase angles for a specified launch current waveform, using a simplified equivalent controlled dc source model for the pulsed alternator and converter system. Once a desired current profile is chosen to deliver the required action to the projectile, the railgun equations are used to determine the required breech voltage profile. The thyristor firing angle versus time to produce this breech voltage is then calculated from the equivalent dc source model. Improvements to the basic model incorporating field current decay and rotor speed reduction with time are discussed. The method has been embedded in a Mathcad worksheet. Results from the simplified model show good agreement when compared to a detailed Saber system simulation.
Sponsorship	IEEE Magnetics Society
Starting Page	322
Ending Page	325
Page Count	4
File Size	128954
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	Alternators Thyristors Shape control Railguns Control systems Projectiles Voltage Electromagnetic launching EMP radiation effects Pulse shaping methods thyristor firing angles Power conditioning pulsed alternator Thevenin equivalent model
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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