ac Loss analysis for superconducting generator armatures wound with subdivided Y–Ba–Cu–O coated tape

Hysteretic loss reduction in striated YBCO

“…Current densities greater than 10 6 A/cm 2 at 77 K, self-field, as well as the ability to maintain high current densities in applied magnetic fields, indicate the potential of YBCO thin films in ac applications [1][2][3]. However, the architecture presently being developed for high temperature superconducting (HTS) coated conductors is primarily for dc environments [3][4][5][6].…”

“…With applied magnetic fields normal to the c-axis, these high aspect ratios can lead to unacceptable hysteretic losses in ac applications of the HTS coated conductors such as motors, generators, transformers, etc. [1,2,7].…”

The Integration of YBACU3O6+X Coated Conductors into Magnets and Rotating Machinery

“…Usually in the literature [1,2,11] one can find a description of the axial twist shown in Fig. 2(a).…”

“…This type of wiring is less efficient than the diamond-shaped armature, but it has been suggested recently as the type suitable for all-cryogenic aircraft generators [11]. The Gramme ring wiring is somewhat similar to a helical coil.…”

Thin YBa2Cu3O7-δpatterns by Chemical Solution Processing using Ink-Jet Printing

“…There will always be eddy current losses associated with substrate and stabilization layers, which can be reduced by maximizing the substrate resistance and by also striating the stabilization layer. These methods, and avoiding interfilamentary bridging, also reduce coupling currents; but twisting the conductor, or ideally fully transposing the filaments, is required to minimize coupling losses [10][11][12][13][14][15][16][17][18]. This filamentary superconducting structure can be accomplished through several techniques which can be divided into two main approaches: with or without material removal.…”