AC Losses and Their Thermal Effect in High Temperature Superconducting Machines

Xiaowei (Andy) Song, Nenad Mijatovic, Shengnan Zou, Bogi Bech Jensen, Joachim Holbøll

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    In transient operations or fault conditions, high temperature superconducting (HTS) machines suffer AC losses which have an influence on the thermal stability of superconducting windings. In this paper, a method to calculate AC losses and their thermal effect in HTS machines is presented. The method consists of three sub-models that are coupled only in one direction. The magnetic field distribution is first solved in a machine model, assuming a uniform current distribution in HTS windings. The magnetic fields on the boundaries are then used as inputs for an AC loss model which has a homogeneous approximation and solves the H formulation. Afterwards, the computed AC losses are considered as the heat source in a thermal model to study the temperature profile in HTS windings. The method proposed is able to evaluate AC losses and their thermal effect, thus providing a reference to design an HTS machine and its cooling system.
    Original languageEnglish
    Title of host publicationProceedings of 24th International Conference on Magnet Technology.
    Number of pages5
    Publication date2015
    Article number1ORCA 07
    Publication statusPublished - 2015
    Event24th International Conference On Magnet Technology - Seoul, Korea, Republic of
    Duration: 18 Oct 201526 Oct 2015
    Conference number: 24


    Conference24th International Conference On Magnet Technology
    Country/TerritoryKorea, Republic of


    • AC losses
    • Finite element methods
    • Homogenization
    • Superconducting machines
    • Thermal stability


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