Development of low-AC-loss Bi-2223 superconducting multifilamentary wires

Kazuo Funaki, Yuji Sasasige, Haruo Yanagida, Satoshi Yamasaki, Masataka Iwakuma, Naoki Ayai, Tomonobu Ishida, Yusuke Fukumoto, Hiroki Kamijo

研究成果: ジャーナルへの寄稿学術誌査読

10 被引用数 (Scopus)


We have been designing and developing advanced Ag-sheathed Bi-2223 multifilamentary wires for the future applications to superconducting transformers of electric rolling stocks. Trial wires were twisted without remarkable degradation in the transport property for suppressing AC losses in a perpendicular magnetic field configuration. The AC losses were measured by a saddle-shaped pickup coil in a wide range of frequency up to a commercial frequency. The experimental results show that the AC loss per cycle has linear frequency dependence in a region of the practical amplitude of AC magnetic field for the transformers, where the excess loss may come from an electromagnetic coupling between the filaments. The hysteresis loss evaluated as a low frequency limit of the AC loss was also reduced with the decrease in the twist pitch, which may be considered as a similar effect to the so-called "twist effect" observed in in- situ Nb3Sn wires.

ジャーナルIEEE Transactions on Applied Superconductivity
出版ステータス出版済み - 6月 2009

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学


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