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The Design of a Lightweight HTS Synchronous Generator Cooled by Subcooled Liquid Nitrogen

The Design of a Lightweight HTS Synchronous Generator Cooled by Subcooled Liquid Nitrogen
The Design of a Lightweight HTS Synchronous Generator Cooled by Subcooled Liquid Nitrogen
A final design of a dasiacorelesspsila 100 kW HTS synchronous generator, to be built at the University of Southampton is under way. The new generator will use the same conventional 2-pole, 3 phase stator used by for the dasiairon coredpsila generator. The new HTS rotor has no central core and the rotor winding is built with 15 double pancake coils. Each coil has 38 turns of BiPb2223 superconducting tape, with nominal current of 180 A at 77 K. In this design, only two flux diverters are used at the top and bottom of the winding to help shape the magnetic field. The coils are located on the inner wall of the cryostat. The construction of the cryostat poses our greatest mechanical challenge. Although we have avoided problems with differential thermal contractions by making the cryostat entirely from stainless steel, the cryostat requires considerable reinforcements. Additional supports and stiffening ribs must be welded to the thin-walled structure. Distortion/rippling during welding must be eliminated to ensure the final welds to the ring flanges can be made. The pole-pieces, which help to improve the waveform characteristics of the machine, are located in the warm space between the cold flange of the cryostat and the inner wall of the vacuum vessel. Unfortunately, the overall magnetic performance has been affected by the parallel stacking of the coils. Some suggestions for altering the current stator have been presented which show that improvements to the voltage waveforms can be achieved
BSCCO coils, HTS generator, HTS machines, superconducting motor
1051-8223
1674-1677
Bailey, W.O.S
c356b2e3-a783-4b4c-8c7b-521696d3b37c
Al-Mosawi, M.
a7bbbced-1da5-4213-975f-fd3ab26e7567
Yang, Yifeng
0efc6771-972c-402f-af4f-3468b2991b5c
Goddard, K.
fe2a2194-8b55-43c1-bdca-341691b71b2d
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Bailey, W.O.S
c356b2e3-a783-4b4c-8c7b-521696d3b37c
Al-Mosawi, M.
a7bbbced-1da5-4213-975f-fd3ab26e7567
Yang, Yifeng
0efc6771-972c-402f-af4f-3468b2991b5c
Goddard, K.
fe2a2194-8b55-43c1-bdca-341691b71b2d
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234

Bailey, W.O.S, Al-Mosawi, M., Yang, Yifeng, Goddard, K. and Beduz, C. (2009) The Design of a Lightweight HTS Synchronous Generator Cooled by Subcooled Liquid Nitrogen. IEEE Transactions on Applied Superconductivity, 19 (3), 1674-1677. (doi:10.1109/TASC.2009.2017841).

Record type: Article

Abstract

A final design of a dasiacorelesspsila 100 kW HTS synchronous generator, to be built at the University of Southampton is under way. The new generator will use the same conventional 2-pole, 3 phase stator used by for the dasiairon coredpsila generator. The new HTS rotor has no central core and the rotor winding is built with 15 double pancake coils. Each coil has 38 turns of BiPb2223 superconducting tape, with nominal current of 180 A at 77 K. In this design, only two flux diverters are used at the top and bottom of the winding to help shape the magnetic field. The coils are located on the inner wall of the cryostat. The construction of the cryostat poses our greatest mechanical challenge. Although we have avoided problems with differential thermal contractions by making the cryostat entirely from stainless steel, the cryostat requires considerable reinforcements. Additional supports and stiffening ribs must be welded to the thin-walled structure. Distortion/rippling during welding must be eliminated to ensure the final welds to the ring flanges can be made. The pole-pieces, which help to improve the waveform characteristics of the machine, are located in the warm space between the cold flange of the cryostat and the inner wall of the vacuum vessel. Unfortunately, the overall magnetic performance has been affected by the parallel stacking of the coils. Some suggestions for altering the current stator have been presented which show that improvements to the voltage waveforms can be achieved

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More information

Published date: 16 June 2009
Keywords: BSCCO coils, HTS generator, HTS machines, superconducting motor

Identifiers

Local EPrints ID: 79777
URI: https://eprints.soton.ac.uk/id/eprint/79777
ISSN: 1051-8223
PURE UUID: 2256f924-da19-403a-9c2b-85175ff28808

Catalogue record

Date deposited: 19 Mar 2010
Last modified: 18 Jul 2017 23:16

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