Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 31, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6668/aad9e0
Keywords
MgB2 conductor; racetrack coil; solid nitrogen impregnation; wind turbine generators
Categories
Funding
- Australian Research Council [DE130101247, LP160101784]
- Australian Academy of Sciences' AISRF scheme, International Scientific Partnership at King Saud University through ISPP [0095]
- International SAMP
- T Cooperation Program of China (ISTCP) [2015DFA13040]
- Australian Research Council [LP160101784, DE130101247] Funding Source: Australian Research Council
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To develop powerful wind turbine generators using superconducting technology, high-performance superconducting racetrack coils are essential. Herein, we report an evaluation of a multifilamentary magnesium diboride (MgB2) conductor-based racetrack coil cooled and impregnated simultaneously by solid nitrogen (SN2). The coil was wound on a copper former with 13 mm winding width, an inner diameter of 124 mm at the curvature, and 130 mm length of the straight section. An in situ processed S-glass-insulated 36-filament MgB2 wire was wound on the former in two layers with 19.5 turns, and heat treated via the wind and react method without any epoxy resin. The coil was evaluated for critical temperature and transport critical current in the SN2 environment at different temperatures up to 31.3 K in self-field. The coil was able to carry 200 A transport current at 28.8 K in self-field. During coil charging and operation, SN2 effectively acted as an impregnation material. The test results demonstrate the viability to use MgB2 racetrack coil potentially with SN2 impregnation in advanced rotating machine applications.
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