Development of Low-AC-Loss Bi-2223 Superconducting Multifilamentary Wires
| Autor: | H. Yanagida, Hiroki Kamijo, S. Yamasaki, Masataka Iwakuma, Kazuo Funaki, Yusuke Fukumoto, Y. Sasasige, Naoki Ayai, T. Ishida |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Superconductivity
High-temperature superconductivity Materials science Condensed matter physics Frequency dependence Low frequency Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Magnetic field Hysteresis Amplitude law Electrical and Electronic Engineering Transformer |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 19:3053-3056 |
| ISSN: | 1558-2515 1051-8223 |
| Popis: | 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 ldquotwist effectrdquo observed in in-situ Nb3Sn wires. |
| Databáze: | OpenAIRE |
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