High frequency, multi-phase power applications such as wireless power transfer systems, high-frequency transformers, and high-speed electric machines typically employ Litz wire to reduce AC losses. This paper provides a method to approximate the AC power loss in Litz wire systems with arbitrary field sources, accounting for local elliptically rotational fields. The general approach is demonstrated with a simplified FEA formulation and shows good alignment with explicit strand-level simulations. Focus of the analysis is placed on multi-coil, air-core applications such as resonant power transfer systems; a fast semi-analytical approach using averaging points is provided for these problems to reduce run times by several orders of magnitude.


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    Title :

    Calculation of AC Losses in Multi-phase Litz Coil Systems


    Contributors:


    Publication date :

    2022-06-15


    Size :

    4754615 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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