TY - JOUR

T1 - Numerical and theoretical evaluations of AC losses for single and infinite numbers of superconductor strips with direct and alternating transport currents in external AC magnetic field

AU - Kajikawa, K.

AU - Funaki, K.

AU - Shikimachi, K.

AU - Hirano, N.

AU - Nagaya, S.

N1 - Funding Information:
This work was partly supported by the New Energy and Industrial Technology Development Organization (NEDO) of Japan as the Technological Development of Yttrium-based Superconducting Power Equipment. The authors would also like to thank Dr. Yasunori Mawatari, National Institute of Advanced Industrial Science and Technology, for valuable comments on the fundamental electromagnetic properties of the superconductor strips.

PY - 2010/11/1

Y1 - 2010/11/1

N2 - AC losses in a superconductor strip are numerically evaluated by means of a finite element method formulated with a current vector potential. The expressions of AC losses in an infinite slab that corresponds to a simple model of infinitely stacked strips are also derived theoretically. It is assumed that the voltagecurrent characteristics of the superconductors are represented by Bean's critical state model. The typical operation pattern of a Superconducting Magnetic Energy Storage (SMES) coil with direct and alternating transport currents in an external AC magnetic field is taken into account as the electromagnetic environment for both the single strip and the infinite slab. By using the obtained results of AC losses, the influences of the transport currents on the total losses are discussed quantitatively.

AB - AC losses in a superconductor strip are numerically evaluated by means of a finite element method formulated with a current vector potential. The expressions of AC losses in an infinite slab that corresponds to a simple model of infinitely stacked strips are also derived theoretically. It is assumed that the voltagecurrent characteristics of the superconductors are represented by Bean's critical state model. The typical operation pattern of a Superconducting Magnetic Energy Storage (SMES) coil with direct and alternating transport currents in an external AC magnetic field is taken into account as the electromagnetic environment for both the single strip and the infinite slab. By using the obtained results of AC losses, the influences of the transport currents on the total losses are discussed quantitatively.

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U2 - 10.1016/j.physc.2010.05.103

DO - 10.1016/j.physc.2010.05.103

M3 - Article

AN - SCOPUS:77957926718

VL - 470

SP - 1321

EP - 1324

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - 20

ER -