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

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).


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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

Item Type: Article
Digital Object Identifier (DOI): doi:10.1109/TASC.2009.2017841
ISSNs: 1051-8223 (print)
Related URLs:
Keywords: BSCCO coils, HTS generator, HTS machines, superconducting motor
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions : University Structure - Pre August 2011 > School of Engineering Sciences > Thermofluids and Superconductivity
ePrint ID: 79777
Accepted Date and Publication Date:
16 June 2009Published
Date Deposited: 19 Mar 2010
Last Modified: 31 Mar 2016 13:15
High temperature superconducting demonstration synchronous generator with a coreless rotor: design, build and test
Funded by: EPSRC (EP/D000688/1)
Led by: Jan Sykulski
1 April 2006 to 30 September 2009

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