Concept of Multiply Connected Superconducting Tapes

TL;DR

This paper explores the design of multiply connected superconducting tapes with superconducting bridges to reduce ac losses and improve reliability in superconducting generators, balancing filament count and connectivity.

Contribution

It introduces a novel superconducting tape design with a network of bridges for current sharing, addressing loss reduction and reliability issues.

Findings

Reduced hysteretic losses with filamentation and bridging.

Enhanced reliability through current sharing network.

Trade-offs between filament number and loss minimization.

Abstract

The possibility of a substantial reduction of weight and size of electrical generators is the main incentive behind the effort to develop superconducting armature windings based on coated conductors in the form of wide tapes with large aspect ratio. The main obstacle to the application of coated superconductors in stator windings is the large losses incurred due to the ac magnetic field produced by the rotor's dc coils of the field windings. In the range of frequencies typical for aircraft generators, the hysteretic losses in wide tapes are unacceptably high. They can be reduced by dividing the superconducting layer into multiple filaments separated by non-superconducting barriers. However, the lack of current sharing between the filaments makes the conductor vulnerable to the localized defects, so that a single blockage can impede the flow of transport current through the whole length of a given filament. We present estimates of reliability as well as the magnetization losses in multiply connected superconductors. In this type of superconducting tape, a sparse network of superconducting bridges, which allows for current sharing, connects the filaments. The trade-off between the different types of losses and the connectivity requirement imposes restrictions on the number of filaments and properties of the network of bridges.