Ce. Oberly et al., ac loss analysis for superconducting generator armatures wound with subdivided Y-Ba-Cu-O coated tape, CRYOGENICS, 41(2), 2001, pp. 117-124
Advances in Y-Ba-Cu-O coated thin film tape may allow narrow filaments with
very high current density on a thin metal alloy substrate which is separat
ed from the superconductor by a dielectric buffer. These tapes will exhibit
minimized ac loss by subdividing the Y-Ba-Cu-O layer with barriers which e
xhibit high electrical resistance. Assuming a fully penetrated magnetic fie
ld, low loss conductor concepts were incorporated into 1 MW armature design
s for various configurations of Y-Ba-Cu-O conductors over the frequency ran
ge 50-1000 Hz. Low ac loss armature conductor designs are developed for meg
awatt class generators loss for both a 50-60 Hz utility application and a h
igher frequency aircraft application. Conductor design tradeoffs are discus
sed and ac loss minimization techniques compatible with realistic Y-Ba-Cu-O
coated conductor processing are considered, The ac loss in Y-Ba-Cu-O armat
ure windings of a synchronous alternator may for the first time permit prac
tical, lightweight all-cryogenic generators which can deliver greater than
or equal to megawatt at frequencies much greater than 50-60 Hz. (C) 2001 Pu
blished by Elsevier Science Ltd.