An Armature-Stator Contact Resistance Model for Explosively Driven Helical Magnetic Flux Compression Generators

Kiuttu, G.F.; Chase, Jay B.

doi:10.1109/ppc.2005.300682

Cited by 14 publications

(7 citation statements)

References 5 publications

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“…Some difficulties were encountered in theoretical description of the HFCG. Theoretically predicted currents were several times as large as those measured experimentally [8].…”

Section: Introductionmentioning

confidence: 55%

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Two-dimensional model of intrinsic magnetic flux losses in helical flux compression generators

Haurylavets¹,

Tikhomirov²

2012

Preprint

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Helical Flux Compression Generators (HFCG) are used for generation of mega-amper current and high magnetic fields. We propose the two dimensional HFCG filament model based on the new description of the stator and armature contact point. The model developed enables one to quantitatively describe the intrinsic magnetic flux losses and predict the results of experiments with various types of HFCGs. We present the effective resistance calculations based on the non-linear magnetic diffusion effect describing HFCG performance under the strong conductor heating by currents.

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“…Some difficulties were encountered in theoretical description of the HFCG. Theoretically predicted currents were several times as large as those measured experimentally [8].…”

Section: Introductionmentioning

confidence: 55%

“…A number of HFCG numerical models using these factors have been proposed over the years. The awareness of the fact that besides the resistance losses, there exist other losses in the vicinity of the contact point appeared to be the only consistent view [7,8,10].…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional model of intrinsic magnetic flux losses in helical flux compression generators

Haurylavets¹,

Tikhomirov²

2012

Preprint

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“…We have previously published an analytic model for the enhanced flux loss near the contact point 6 . It was based on several approximations, but involved only the known and understood process of flux diffusion.…”

Section: Contact Point To Critical Point Resistancementioning

confidence: 99%

“…In our modeling, we have settled on a circuit-based approach using the code, CAGEN, developed over many years [1][2][3][4] . Its success is based on several key factors, including identification of self-consistent definitions of inductance and resistance, determination of effective wire-to-wire proximity effect models 5 , including diffusion effects, and development of an analytic model for enhanced diffusion losses in the vicinity of the moving armature-stator contact point 6 . These various models are described in the following sections.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Modeling Helical FCGS

Kiuttu¹,

Chase²,

Chato³

2006

2006 IEEE International Conference on Megagauss Magnetic Field Generation and Related Topics

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Helical explosively driven magnetic flux compression generators (FCGs) have been intensively investigated for more than four decades, because of their ability to amplify electrical current and magnetic energy with high gain and relatively small size. Whereas coaxial-geometry FCGs have lent themselves to reasonably accurate modeling, helical FCGs have always been considered "anomalously lossy," with calculated performance invariably exceeding observed performance -often by factors of two or more in peak output current.With the advent of the analytically derived Kiuttu Contact Resistance Model (KCRM), it has become possible to approximately account for the losses in the vicinity of the contact point between armature and stator without resorting to any empirical tuning factors. Such factors have generally been required by other modeling and simulation codes to achieve agreement with experimental data. Since its introduction, the KCRM has been extended to include the region immediately in front of the contact point as well, thus improving its accuracy.Another key element in modeling the performance of helical FCGs is proper accounting of the proximity effect between adjacent turns of the solenoidal stator winding. This effect alters the magnetic field and current density distributions from their isolated, approximately locally uniform distributions, leading to an effective increase in flux diffusion rates. In order to quantitatively assess this effect, we have run a number of twodimensional quasi-magnetostatic simulations for varying stator geometries and extracted simplified approximations that can be used in one-dimensional diffusion calculations.We have also examined the details of the circuit model definition (i.e., flux-based from Faraday's Law, or the diffusion equation, and energy-based from Poynting's Theorem). The Generator Equation, derived from the circuit model, involves lumped-element approximations for resistance and inductance, and we have shown that the combination of inductance and resistance, which yields experimental current and time derivative of current, is not unique, and that each lumped element must be consistently defined.We have incorporated these various models and effects into the CAGEN 1½-D modeling code. As a result, we have been able to accurately calculate the performance of a wide variety of FCGs without using any additional adjustment factors. Representative results, as well as descriptions of the models, will be presented.

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“…Major advances have occurred over the last few years that allow, for the first time, calculation of their output with high accuracy [1][2][3][4]. However, the calculated results assume that there are no electrical breakdowns in the generator.…”

Section: Introductionmentioning

confidence: 99%