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Testing of a lightweight coreless HTS synchronous generator cooled by subcooled liquid nitrogen

Testing of a lightweight coreless HTS synchronous generator cooled by subcooled liquid nitrogen
Testing of a lightweight coreless HTS synchronous generator cooled by subcooled liquid nitrogen
A lightweight 'coreless' (100 kW), 2-pole HTS rotor, designed and built at the University of Southampton has been completed and is now in the testing phase of the project. By removing the iron core from the new cold rotor, the weight has been halved in comparison to the previous rotor. The 'cold' components of the rotor assembly make up a sixth of the total weight, which has provided significant time and cost savings in the cool down process. A lightweight doughnut shaped cryostat houses the HTS winding. The winding itself is constructed from sixteen double pancake coils, wound from BSCCO HTS tape. Practical testing of the generator began with a series of stationary tests. The critical current (Ic) of the HTS winding is 77 A at liquid nitrogen temperature (77.4 K) and increases to 156 A, when cooled with liquid air (61.6 K). The air-gap flux density is ~ 0.3 T at 156 A. The machines total harmonic distortion (THD) was predicted to be around 5.4% with the measured THD=5% and this despite using an unoptimized stator. Finally, the synchronous reactance, Xs was evaluated to be 0.24 p.u. This is a 1/5 of the value found for conventional synchronous machines and is largely due to its air-core structure.
bscco coils, hts generator, hts machines, superconducting motor
1051-8223
1159 -11562
Bailey, Wendall
c356b2e3-a783-4b4c-8c7b-521696d3b37c
Wen, Huaming
7f85c906-6e0b-4005-81e2-abd6064ebd60
Al-Mosawi, Maitham
1176fc20-4f87-493c-8543-b4911f754ece
Goddard, Kevin
fe2a2194-8b55-43c1-bdca-341691b71b2d
Yang, Yifeng
4cac858a-e0c0-4174-a839-05ca394fc51f
Bailey, Wendall
c356b2e3-a783-4b4c-8c7b-521696d3b37c
Wen, Huaming
7f85c906-6e0b-4005-81e2-abd6064ebd60
Al-Mosawi, Maitham
1176fc20-4f87-493c-8543-b4911f754ece
Goddard, Kevin
fe2a2194-8b55-43c1-bdca-341691b71b2d
Yang, Yifeng
4cac858a-e0c0-4174-a839-05ca394fc51f

Bailey, Wendall, Wen, Huaming, Al-Mosawi, Maitham, Goddard, Kevin and Yang, Yifeng (2011) Testing of a lightweight coreless HTS synchronous generator cooled by subcooled liquid nitrogen. IEEE Transactions on Applied Superconductivity, 21 (3), 1159 -11562. (doi:10.1109/TASC.2010.2093486).

Record type: Article

Abstract

A lightweight 'coreless' (100 kW), 2-pole HTS rotor, designed and built at the University of Southampton has been completed and is now in the testing phase of the project. By removing the iron core from the new cold rotor, the weight has been halved in comparison to the previous rotor. The 'cold' components of the rotor assembly make up a sixth of the total weight, which has provided significant time and cost savings in the cool down process. A lightweight doughnut shaped cryostat houses the HTS winding. The winding itself is constructed from sixteen double pancake coils, wound from BSCCO HTS tape. Practical testing of the generator began with a series of stationary tests. The critical current (Ic) of the HTS winding is 77 A at liquid nitrogen temperature (77.4 K) and increases to 156 A, when cooled with liquid air (61.6 K). The air-gap flux density is ~ 0.3 T at 156 A. The machines total harmonic distortion (THD) was predicted to be around 5.4% with the measured THD=5% and this despite using an unoptimized stator. Finally, the synchronous reactance, Xs was evaluated to be 0.24 p.u. This is a 1/5 of the value found for conventional synchronous machines and is largely due to its air-core structure.

Full text not available from this repository.

More information

e-pub ahead of print date: 23 December 2010
Published date: June 2011
Keywords: bscco coils, hts generator, hts machines, superconducting motor
Organisations: Electronics & Computer Science, Engineering Science Unit

Identifiers

Local EPrints ID: 337969
URI: https://eprints.soton.ac.uk/id/eprint/337969
ISSN: 1051-8223
PURE UUID: a50829f1-bd4e-4276-ac0d-04233bd66a75
ORCID for Yifeng Yang: ORCID iD orcid.org/0000-0002-3874-6735

Catalogue record

Date deposited: 09 May 2012 11:27
Last modified: 20 Jul 2019 01:21

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