TY - JOUR
T1 - Proposal of new structure of MgB2 wires with low AC loss for stator windings of fully superconducting motors located in iron core slots
AU - Kajikawa, K.
AU - Osaka, R.
AU - Kuga, H.
AU - Nakamura, T.
AU - Wakuda, T.
N1 - Funding Information:
This work was supported by the Industrial Technology Research Grant Program in 2008 ( 08B38006a ) from the New Energy and Industrial Technology Development Organization (NEDO) of Japan.
PY - 2011/11
Y1 - 2011/11
N2 - The new structure of MgB2 monofilamentary wires for stator windings of fully superconducting motors is proposed to reduce their AC losses in iron core slots for the application of an alternating transport current. In order to validate the proposed structure of wire for loss reduction, numerical calculations are carried out by means of a finite element method using edge elements formulated with a self-field due to currents induced in an analysis region. It is assumed that the voltage-current characteristics of the MgB 2 superconductor are given by Bean's critical state model, in which the critical current density is independent of the local magnetic field. The influences of wire structures on the AC losses are discussed quantitatively toward the optimum design of stator windings in fully superconducting motors with the MgB2 wires.
AB - The new structure of MgB2 monofilamentary wires for stator windings of fully superconducting motors is proposed to reduce their AC losses in iron core slots for the application of an alternating transport current. In order to validate the proposed structure of wire for loss reduction, numerical calculations are carried out by means of a finite element method using edge elements formulated with a self-field due to currents induced in an analysis region. It is assumed that the voltage-current characteristics of the MgB 2 superconductor are given by Bean's critical state model, in which the critical current density is independent of the local magnetic field. The influences of wire structures on the AC losses are discussed quantitatively toward the optimum design of stator windings in fully superconducting motors with the MgB2 wires.
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U2 - 10.1016/j.physc.2011.05.218
DO - 10.1016/j.physc.2011.05.218
M3 - Article
AN - SCOPUS:80054988880
SN - 0921-4534
VL - 471
SP - 1470
EP - 1473
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 21-22
ER -