Performance of the Fast-Ramping High Temperature Superconducting Magnet System for an Active Magnetic Regenerator

Fast magnetic field alternation is indispensable for continuous magnetic refrigeration. An active magnetic regenerative refrigerator (AMRR) utilizes magnetocaloric effect of magnetic materials which occurs during magnetization and demagnetization processes. A conduction cooled high temperature superconducting (HTS) magnet can be one of the prospective candidates as an alternating magnetic field generator. This paper describes the development effort of the cryogen-free HTS magnet for the AMRR. The magnet consists of twelve double pancake GdBCO coils which are insulated with polyimide tape. A two-stage GMcryocooler was employed to cool down themagnet. The critical current of the magnet was measured at the operating temperature before alternating current (AC) operation. In order to remove heat produced by AC loss with small temperature difference, thermal links between the cryocooler and the magnet were carefully designed. This paper presents the test results, AC loss analysis of theHTS magnet in the AMRRsystem. Maximum central magnetic field of 3 T (150 A) was achieved with the maximum ramping rate of 1 T/s (50 A/s). The AC loss was measured as 11.2Wat the operating conditions and the generated heate was effectively removed by the cryocooler. The AC loss was predicted by the numerical simulation and the simulation results were compared with the experimental results.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2017-06
Language
English
Keywords

AC LOSS; REFRIGERATOR; FIELD; ADR

Citation

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, v.27, no.4

ISSN
1051-8223
DOI
10.1109/TASC.2017.2652324
URI
http://hdl.handle.net/10203/222674
Appears in Collection
ME-Journal Papers(저널논문)
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