TY - JOUR
T1 - Numerical analysis of the demagnetization effect in a superconducting machine with bulk HTS material on the rotor
AU - Hong, Z
AU - Jiang, Y
AU - Pei, R
AU - Yuan, Weijia
AU - Marchant, R
AU - Coombs, T A
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=68649094651&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1109/tasc.2009.2018794
U2 - 10.1109/tasc.2009.2018794
DO - 10.1109/tasc.2009.2018794
M3 - Article
SN - 1051-8223
VL - 19
SP - 2897
EP - 2900
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 3
ER -