NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
New Test Rig to Measure Alternating Current Losses of Both Low and High Critical Temperature SuperconductorsThis paper presents the design, development, operation, and test capabilities of a proposed superconducting coil testbed to measure alternating current (AC) losses at the NASA Glenn Research Center. Superconducting AC losses are important in the design of electric stators and rotors, power transmission lines, transformers, fault current limiters, magnets, and superconducting energy storage (not batteries). The new liquid-hydrogen-based rig will allow superconducting testing across a wide range of test parameters, including injected current up to 400 A, frequency (0 to 400 Hz), magnetic field (0 to 0.6 T), phase angle between induced voltage and injected current (–180° to 180°), coil coolant temperature (18 to 28 K), and AC power loss (5 to 30 W). While the target application of interest is 20 K superconducting MgB2 (the only superconductor that can presently be made with low losses) stator coils for future electric machines, the rig can accommodate test articles (TAs) with straight wire, tape, cables, coils of any shape, any allowable combination of superconducting wire and fluid (e.g., yttrium barium copper oxide (YBCO) coils and liquid nitrogen), and AC or direct current (DC) testing. The new spin rig builds upon the existing Air Force spin rig through a more flexible mode of fluid control, a wider gap space (up to 10.2 cm) for TAs, and the ability to accommodate TAs over a wider range of operating temperatures (18 to 95 K) using liquid hydrogen, gaseous helium, or liquid nitrogen as the working fluid, thus supporting direct cooled machines below 77 K.
Document ID
20190025926
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Hartwig, Jason (NASA Glenn Research Center Cleveland, OH, United States)
Fraser, Bryan (NASA Glenn Research Center Cleveland, OH, United States)
Brown, Gerald (NASA Glenn Research Center Cleveland, OH, United States)
Kohlman, Lee (NASA Langley Research Center Hampton, VA, United States)
Koci, David (NASA Glenn Research Center Cleveland, OH, United States)
Hunker, Keith (NASA Glenn Research Center Cleveland, OH, United States)
Bowman, Cheryl (NASA Glenn Research Center Cleveland, OH, United States)
Schrum, Phillip (ForeFront Engineering & Design, Inc. Pittsburgh, PA, United States)
Matten, David (ForeFront Engineering & Design, Inc. Pittsburgh, PA, United States)
Date Acquired
June 14, 2019
Publication Date
June 1, 2019
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NASA/TM-2019-220046
E-19642-TN63356
GRC-E-DAA-TN63356
Funding Number(s)
WBS: 081876.02.03.05.02.02
Distribution Limits
Public
Copyright
Public Use Permitted.
Technical Review
Single Expert
Keywords
liquid hydrogen
MgB2
AC losses
superconducting

Related Records

There are no records associated with this record.
No Preview Available