AC losses of multifilamentary Bi-2223/Ag conductors with different geometry and filament arrangement

Abstract

This paper presents results from numerical modeling of nontwisted multifilamentary Bi-2223/Ag conductors with various geometry and filament arrangement. Anisotropic models of ( ) and ( ) have been employed in finite element method simulations under different operating conditions -with applied ac transport current, in external parallel and perpendicular ac magnetic field, and with combined current and field of varying orientation. AC losses and current distributions in square and round Bi-2223/Ag wires with different filament arrangement have been calculated and compared to those of a 7-filamentary tape. It is demonstrated that the shape factor of the conductors and the orientation of the local magnetic field with respect to the individual filaments are of primary importance for the ac loss magnitude in different applications. Outlined are the advantages of using conductors with specific filament configuration for a given application.

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

“…A comparison between the critical-state model and a power-law E(J) relation in a matrix array of coated conductors is in [103]. Valuable earlier work using a power-law for several kinds of multi-filamentary wires and tapes is in [102], [131].…”

Non-twisted stacks of coated conductors for magnets: Analysis of inductance and AC losses

“…This method is effective also in Bi-2223 tapes, i.e. adjusting the aspect ratio of the tape, from thin tape to square wire, according to the magnetic field direction, see for example [28] and the conclusion in [29].…”