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A low loss NbTi multifilamentary composite conductor for A.C. use

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7 Author(s)
Ogasawara, T. ; Nihon University, Kanda, Surugadai, Chiyoda-ku, Tokyo, Japan ; Kubota, Y. ; Makiura, T. ; Akachi, T.
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Investigations of a.c. losses and stability of a mixed-matrix NbTi multifilamentary conductor are presented. Fine filament size of 1.0 μm and a tight twist of 5.5 times the wire diameter 0.2 mm result in a time constant of the eddy current of 0.024 msec at 1.0 T. If this conductor is used in superconducting armature windings of rotating machines or in a.c. magnets, generating a maximum field of 1.0 T, economical benefits are expected at operation frequencies below 20 Hz.

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Magnetics, IEEE Transactions on  (Volume:19 ,  Issue: 3 )