Numerical analysis of the demagnetization effect in a superconducting machine with bulk HTS material on the rotor

Z Hong, Y Jiang, R Pei, Weijia Yuan, R Marchant, T A Coombs

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

When a bulk superconducting material is used as the magnets of an electric motor, the magnetized superconducting pucks are subjected to a varying magnetic field which has a detrimental effect on the trapped field. This may lead to a long term decay of the magnetization of the bulk superconductors. In this paper, we analyze numerically the demagnetization effect on bulk superconductors subjected to a magnetic field applied orthogonally to the initial direction of the trapped flux. The condition of a superconducting sample being exposed to a transverse field with varying magnitude is simulated and is very close to the operating environment in a synchronous machine. The decay of magnetization is calculated. The mechanism is explained in terms of the distortion of current distribution on the cross section of the sample. The long term effect of the application of a transverse field is predicted by the model.
Original languageEnglish
Pages (from-to)2897-2900
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume19
Issue number3
DOIs
Publication statusPublished - 2009

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