IEE Colloquium on High Tc Superconducting Materials as Magnets

7-7 Dec. 1995

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  • HTS materials-requirements for magnets

    Publication Year: 1995, Page(s):1/1 - 1/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (268 KB)

    The potential of bulk high temperature superconductors to generate large d.c. magnetic fields, associated with their ability to carry current without resistance, is particularly attractive for both permanent magnet and wire-wound applications. All magnetic fields are produced by the motion of charges. The field generated by conventional iron-based permanent magnets, however, is limited by the numb... View full abstract»

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  • Electromagnetic properties of HTS

    Publication Year: 1995, Page(s):2/1 - 2/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (198 KB)

    The behaviour of magnetic fields in superconductors is quite different in many ways from that in normal metals. It is however simpler and more intuitively obvious than in iron magnetic circuits. There is a close parallel with the pinning of domain walls in ferromagnets and the induction of eddy currents in copper. The connection with the latter is that copper exerts a viscous force on flux, while ... View full abstract»

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  • Melt processing bulk magnets-what can be achieved

    Publication Year: 1995, Page(s):3/1 - 3/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (284 KB)

    High critical current density can be achieved in superconducting large YBCO grains fabricated using seeded peritectic solidification processing techniques. Such large YBCO grains are proved to be the most appropriate candidate for permanent magnet type applications. The main difficulties encountered in fabricating these materials include slow growth rate of the YBCO grains, loss of liquid in the p... View full abstract»

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  • Wire and tape fabrication for DC and AC applications

    Publication Year: 1995, Page(s):4/1 - 4/2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (155 KB)

    Superconducting tapes are produced by the powder in tube method, using silver tubes packed with the ceramic powder precursor. After drawing the tube to mm size wire, cold rolling is used to produce tapes typically 3-5 mm wide and 0.1-0.3 mm thick. Alternatively, a coating of the precursor is deposited on a flat silver ribbon. This is followed by a thermal treatment to form the required superconduc... View full abstract»

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  • Economic prospects for HTS tapes in "magnet" applications

    Publication Year: 1995, Page(s):5/1 - 5/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (186 KB)

    History should make us very wary of predicting the economic potential of high temperature superconductivity. On the other hand a very substantial amount of money is now being spent on the development of HTS tape and wire by companies who hope to supply the materials for the future superconductivity industry. The author tries to predict the qualities required of HTS tape for it to become a commerci... View full abstract»

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  • Motors generators and shielding

    Publication Year: 1995, Page(s):7/1 - 7/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (247 KB)

    The most important parameters of an electrical machine are the power per unit volume (or weight) and the efficiency. Here, the author describes how superconductors can offer significant improvements in both of these parameters and can be used in both rotor and stator winding configurations. View full abstract»

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  • Bearings and energy storage

    Publication Year: 1995, Page(s):8/1 - 8/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (194 KB)

    The discovery of the new high temperature superconductors and especially the discovery of YBCO in 1988 has led to a great deal of interest in the use of superconductors as an active component in noncontact magnetic bearings. A conventional magnetic bearing cannot be composed of entirely passive components. Arrangements of permanent magnets may be stable in up to five out of six axes (three transla... View full abstract»

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  • Current and field distribution within short cylindrical superconductors

    Publication Year: 1995, Page(s):9/1 - 9/7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (628 KB)

    A number of calculations have been carried out to determine the currents and fields within superconductors in cylindrical geometry using the critical state model, where the current is assumed field dependent. The calculations were carried out assuming the superconductor to be in the remnant state, i.e. the external field was applied such that the superconductor was fully penetrated in the mixed st... View full abstract»

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  • Superconducting fault current limiters

    Publication Year: 1995, Page(s):10/1 - 10/3
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (231 KB)

    Fault current limiters (FCLs), superconducting or otherwise, have the potential to reduce fault levels on electricity power networks, and may ultimately lead to lower rated components (i.e. cheaper) being used, or to increased capacity on existing systems. The electricity industry is, therefore, very interested in such devices providing that they satisfy the relevant economic as well as technical ... View full abstract»

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  • HTS materials and microwave tubes

    Publication Year: 1995, Page(s):11/1 - 11/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    Two types of benefit are offered by the use of HTS materials in microwave tubes: (1) reduction of loss due to RF currents flowing on conducting surfaces; (2) provision of the magnetic field needed to confine the electron stream. View full abstract»

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