Cristin-resultat-ID: 1142765
Sist endret: 10. april 2015, 11:23
NVI-rapporteringsår: 2014
Resultat
Vitenskapelig artikkel
2014

Hysteresis losses in MgB2 superconductors exposed to combinations of low AC and high DC magnetic fields and transport currents

Bidragsytere:
  • Niklas Magnusson
  • A.B. Abrahamsen
  • D Liu
  • Magne Runde og
  • Henk Polinder

Tidsskrift

Physica. C, Superconductivity
ISSN 0921-4534
e-ISSN 1873-2143
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2014
Publisert online: 2014
Trykket: 2014
Volum: 506
Sider: 133 - 137
Open Access

Importkilder

Scopus-ID: 2-s2.0-84908204281

Beskrivelse Beskrivelse

Tittel

Hysteresis losses in MgB2 superconductors exposed to combinations of low AC and high DC magnetic fields and transport currents

Sammendrag

MgB2 superconductors are considered for generator field coils for direct drive wind turbine generators. In such coils, the losses generated by AC magnetic fields may generate excessive local heating and add to the thermal load, which must be removed by the cooling system. These losses must be evaluated in the design of the generator to ensure a sufficient overall efficiency. A major loss component is the hysteresis losses in the superconductor itself. In the high DC - low AC current and magnetic field region experimental results still lack for MgB2 conductors. In this article we reason towards a simplified theoretical treatment of the hysteresis losses based on available models in the literature with the aim of setting the basis for estimation of the allowable magnetic fields and current ripples in superconducting generator coils intended for large wind turbine direct drive generators. The resulting equations use the DC in-field critical current, the geometry of the superconductor and the magnitude of the AC magnetic field component as parameters. This simplified approach can be valuable in the design of MgB2 DC coils in the 1-4 T range with low AC magnetic field and current ripples.

Bidragsytere

Niklas Magnusson

  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS

A.B. Abrahamsen

  • Tilknyttet:
    Forfatter
    ved Danmarks Tekniske Universitet

D Liu

  • Tilknyttet:
    Forfatter
    ved Technische Universiteit Delft

Magne Eystein Runde

Bidragsyterens navn vises på dette resultatet som Magne Runde
  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS

Henk Polinder

  • Tilknyttet:
    Forfatter
    ved Technische Universiteit Delft
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