DocumentCode :
483063
Title :
Influence of current waveform on rail-gun launching efficiency
Author :
Yang, Yudong ; Wang, Jianxin
Author_Institution :
Sch. of Electron. Eng. & Optoelectron. Technol., NUST, Nanjing
fYear :
2008
fDate :
17-20 Oct. 2008
Firstpage :
3927
Lastpage :
3931
Abstract :
In many factors affecting rail-gunpsilas launching efficiency, magnetic energy stored in rail inductance and joule heat consumed in rail resistance are the key. To reduce magnetic energy loss, the mathematical expressions for rail-gun such as electromagnetic force, launching efficiency and breech voltage are given, and the relation between current waveform and launching efficiency is found. Theoretical analysis shows that the launching efficiency with constant current can not be greater than 50% due to magnetic energy remained in the rail; while pulse current is ideal current supply because the magnetic energy losses can be reduced remarkably. To reduce the rail resistance loss, the relation between the launching efficiency and current mode is analyzed through an example. Two distributed energy store (DES) modes, a single pulse current mode and a constant current mode are used in the example, and launching efficiencies with different current modes are compared by simulation. Results show that rail-gun launching efficiency with single pulse current is the highest since the rail resistance loss is the lowest among these current modes, and the efficiency with DES mode can not be improved effectively.
Keywords :
electromagnetic forces; energy storage; railguns; breech voltage; current waveform; distributed energy store modes; electromagnetic force; joule heat; magnetic energy loss; rail inductance; rail resistance loss; rail-gun launching efficiency; Coils; Current supplies; Electromagnetic forces; Energy loss; Inductance; Magnetic analysis; Power engineering and energy; Rails; Railway engineering; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Machines and Systems, 2008. ICEMS 2008. International Conference on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-3826-6
Electronic_ISBN :
978-7-5062-9221-4
Type :
conf
Filename :
4771467
Link To Document :
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