Al-Mosawi, M.K., Goddard, K., Beduz, C. and Yang, Y.
Coreless HTS synchronous generator operating at liquid nitrogen temperatures
IEEE Transactions on Applied Superconductivity, 17, (2, part 2), . (doi:10.1109/TASC.2007.899695).
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In this paper we report on our new design of a liquid nitrogen/air cooled 100 KW synchronous enerator with core-less rotor. This follows our successful ompletion of 100KW generators with a 9 wt% Ni steel core operating at 77 K. In the new design, we
demonstrate that a coreless rotor using commercial BSCCO tape is a realistic choice while maintaining the cooling at 57–77 K rather than 25–30 K and still achieving reasonable air-gap flux density. This is made possible by a combination of improved HTS wire technology and a careful optimization of HTS winding and flux diverters. The maximum flux density normal to the broad face of the tape is kept below 0.13 T, even when the air-gap density is raised to 0.5 T. The superconducting winding consists of 22 pancake coils
with a total length of around 1250 meters of HTS tape. The required temperatures down to 57 K are achieved by a purpose-designed refrigeration system where liquid cryogen is circulated via a network of well insulated pipes and a stationery-rotating liquid coupling junction.
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