Abstract
The use of wires containing several tens of superconducting filaments in metallic matrix represents an important innovation in the field of electrical machines. Because the pinning of magnetic flux in the bulk of superconductor is inevitably linked with good current-carrying capability of this material, its magnetic properties are nonlinear and hysteretic. As a consequence, the modelling of flux penetration in AC regime requires application of methods developed for this particular purpose. We present theoretical results obtained with the help of a method that finds the evolution of the flux-penetration front from the minimization of magnetic energy. Simple case of just two superconducting filaments immersed in homogeneous external field increasing in time has been investigated. The process of filament saturation by the critical current density is studied for different mutual distances between filaments, in the two significant cases: electrically insulated filaments, and filaments connected at the ends.
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