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ST490 - Coupled Electromagnetic-Thermal Analysis of YBCO Bulk Magnets for the Excitation System of Low-Speed Electric Generators (Runner up)

Coupled Electromagnetic-Thermal Analysis of YBCO Bulk Magnets for the Excitation System of Low-Speed Electric Generators

 
J. Arnaud1 and P. J. Costa Branco2
 
1The Electrical and Computers Engineering Department, Instituto Superior Técnico, Universidade de Lisboa, Portugal
2TLAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Portugal
 
Abstract — This paper examines the use of YBCO HTS bulk magnets when operating in the magnetic environment of low-speed synchronous generators. A coupled electrothermal Comsol model of bulk YBCOs is first developed, tested and experimentally verified. Joule losses in the HTS magnet are then studied when under AC magnetic fields with frequency and amplitude ranges usually found in those generators. The YBCO capability in maintaining its magnetization level when subjected to those conditions was also analyzed since the objective is to replace the permanent magnets currently used.
The conditions for which superconductivity is lost are studied considering now the magnet submerged in liquid nitrogen. Using the model developed, it was possible to observe temperature rise effects in the superconductor and how temperature influences all its parameters
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Keywords (Index Terms) — Superconducting generators, high temperature superconductors, YBCO, HTS modelling.
 
IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), January 2016. 
Submitted September 11, 2015; Selected October 12, 2015. Reference No. ST490; Category 6.
EUCAS 2015 preprint 2A-LS-P-04.14The final paper version was published online in IEEE Trans. Appl. Supercond. (IEEE Xplore) DOI: 10.1109/TASC.2016.2525920, April 2016 (under changed title).