A New Approach for Improving the Load Current Characteristic of Cascaded Magnetic Flux Compression Generator
Keywords:Dynamic transformer, explosive charge, helical magnetic flux compression generator, incremental resistance, load characteristic
Helical magnetic flux compression generators (HFCGs) are widely used to generate extremely highpower pulses. Two most important output characteristics of HFCGs in their use as pulsed power generators are maximum value of load current and the rise time of that current. In this paper, an approach is proposed to improve the output characteristic of a Cascaded-HFCG. The approach is based on time-varying primary winding of dynamic transformer and addition of a gradually incremental resistance in series with the first stage winding. It is demonstrated analytically using simulation results that the output current and its rise-time improve by minimizing energy returned from secondary winding to primary winding of dynamic transformer. The results are compared to conventional Cascaded-HFCG that has a non-destructive winding in its structure. A finite element model is considered to calculate the selfinductances, mutual inductance and resistances of the generator. A new approach is proposed to gradually increase in the resistance of primary winding of dynamic transformer.
L. L. Altgilbers, M. D. Brown, I. Grishnaev, B. M. Novac, I. R. Smith, I. Tkach, and Y. Tkach, Magnetocumulative Generators, Springer-Verlag, New York, 1999.
A. A. Neuber (Editor), Explosivley Driven Pulsed Power, Helical Magnetic Flux Compression Generators, Springer-Verlag, Berlin, 2005.
R. S. Caird and C. M. Fowler, “Conceptual design for a short-pulse explosive-driven generator,” Proc. 4th Megagauss Magnetic Field Generation and Pulsed Power Applications, pp. 425, 1986.
B. L. Freeman, L. L. Altgilbers, A. D. Luginbill, and J. C. Rock, “Development of small, tapered stator helical magnetic flux compression generators,” Electromagnetic Phenomena, vol. 3, no. 3 (11), 2003.
V. K. Chernyshev, G. S. Volkov, V. A. Ivanov, and V. V. Vakharushev, “Study of basic regularities of formation of multi-MA-current pulses with short risetime by EMG circuit interruption,” in Megagauss Physics and Technology, pp. 663-675, Boston, 1980.
P. V. Duday, A. A. Zimenkov, V. A. Ivanov, A. I. Kraev, S. V. Pak, A. N. Skobelev, and A. Y. Fevralev, “Method of generating a mega-ampere current pulse to accelerate a liner by a magnetic field,” J. Appl. Mech. Tech. Phys., vol. 56, no. 1, pp. 103-107, 2015.
S. D. Gilev and V. S. Prokopiev, “Generation of electromagnetic energy in a magnetic cumulation generator with the use of inductively coupled circuits with a variable coupling coefficient,” J. Appl. Mech. Tech. Phys., vol. 58, no. 4, pp. 571- 579, 2017.
D. Q. Chen, “Research on Dynamic-Cascaded Helical Explosively-Driven Magnetic Flux Compression Generators,” Ph.D. Dissertation, Changsha, P. R. China, 2015.
A. Young, A. Neuber, and M. Kristiansen, “Design consideration for flux-trapping helical flux compression generator energized by capacitive discharge,” Pulsed Power Conference (PPC), pp. 527-531, Chicago, 2011.
A. Young, A. Neuber, and M. Kristiansen, “Modeling and simulation of simple flux-trapping FCGs utilizing PSpice software,” IEEE Trans. Plasma Sci., vol. 38, no. 8, Aug. 2010.
Y. Wang, J. Zhang, D. Chen, S. Cao, and D. Li, “Fast modeling of flux trapping cascaded explosively driven magnetic flux compression generators,” Rev. Sci. Instrum., 84, 014703, 2013.
A. V. Shurupov, V. E. Fortov, A. V. Koslov, A. A. Leont'ev, N. P. Shurupova, V. E. Zavalova, S. V. Dudin, V. B. Mintsev, and A. E. Ushnurtsev, “Cascade explosive magnetic generator of rapidly increasing current pulses,” in 14th International Conference on Megagauss Magnetic Field Generation and Related Topics, pp. 1-5, 2012.
A. A. Bazanov, “Helical magnetocumulative generators with magnetic flux amplification: comparative advantages of amplification schemes and the operational efficiency of generators with dynamic transformation,” Tech. Phys., vol. 56, no. 9, pp. 1339-1344, 2011.
B. M. Novac and I. R. Smith, “A zero-dimensional computer code for helical flux-compression generators,” Electromagnetic Phenomena, vol. 3, no. 4, 2003.
B. M. Novac, I. R. Smith, M. C. Enache, and H. R. Stewardson, “2D modeling of inductively coupled helical flux-compression generators - FLUXAR systems,” Laser Part. Beams, vol. 15, no. 3, pp. 397-412, 1997.
M. H. Khanzade, Y. Alinejad-Beromib, and A. Shoulaie, “Calculation of time-varying equivalent inductance and resistance of helical flux compression generators using the 2D filamentary method and dynamic matrix concept in the frequency domain,” Chin. Phys. B, vol. 19, no. 1, 2010.
V. A. Demidov, “Problems of creation of highefficient magnetocumulative generators electric strength of helical magnetocumulative generators,” IEEE Trans. Plasma Sci., vol. 38, no. 8, pp. 1773- 1779, 2010.