Three-Phase Modulated Pole Machine Topologies Utilizing Mutual Flux Paths

Jamie G. Washington, Glynn J. Atkinson, Nick J. Baker, Alan G. Jack, Barrie C. Mecrow, Bogi Bech Jensen, Lars-Olov Pennander, Göran L. Nord, Lars Sjöberg

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    This paper discusses three-phase topologies for modulated
    pole machines (MPMs). The authors introduce a new threephase
    topology, which takes advantage of mutual flux paths; this
    is analyzed using 3-D finite-element methods and compared to a
    three-phase topology using three single-phase units stacked axially.
    The results show that the new “combined-phase MPM” exhibits
    a greater torque density, while offering a reduction in the
    number of components. The results obtained from two prototypes
    are also presented to verify the concept; the results show that the
    “combined-phase” machine could provide both performance and
    constructional benefits over prior MPM topologies.
    Original languageEnglish
    JournalIEEE Transactions on Energy Conversion
    Issue number2
    Pages (from-to)507-515
    Publication statusPublished - 2012


    • AC machine
    • Modulated pole
    • Mutual flux path
    • Permanent magnet machine
    • Phase isolation
    • Three phase
    • Transverse flux
    • torque dense


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