Lamination joint reluctance in stator cores - A forgotten problem?

D. R. Bertenshaw, AC Smith

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


    Stator cores of large electrical machines most commonly use half-overlap lamination joints. These can cause magnetic saturation in the region of the joints, such that by flux levels of 1.2 T the toroidal reluctance for a typical core can increase by 200% over that expected. Magnetic anisotropy can conversely reduce expected toroidal reluctance, though by only 18-30%. While long predicted, their impact on magnetic circuit design and especially high flux stator core testing remains apparently unrecognized in industry. The saturation phenomenon is studied and its net effect on the toroidal B/H response of a stator core predicted with FE models and validated by test.
    Original languageEnglish
    Title of host publicationPEMD 2014, The 7th IET international conference on Power Electronics, Machines and Drives
    Place of PublicationLondon
    PublisherInstitution of Engineering and Technology
    Number of pages6
    Publication statusPublished - Apr 2014
    EventPEMD 2014 - Power Electronics, Machines and Drives Conference - Manchester, UK
    Duration: 8 Apr 201410 Apr 2014


    ConferencePEMD 2014 - Power Electronics, Machines and Drives Conference
    CityManchester, UK


    • finite element analysis
    • laminations
    • machine testing
    • magneticanisotropy
    • magnetic circuits
    • magnetic cores
    • magnetic flux
    • reluctancemachines
    • stators
    • FE model
    • electrical machines
    • half-overlap laminationjoints
    • high flux stator core testing
    • magnetic anisotropy
    • magneticcircuit design
    • magnetic saturation
    • stator cores
    • toroidal B-Hresponse
    • toroidal reluctance
    • condition monitoring
    • interlaminarinsulation
    • lamination joint
    • stator


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