Efficient modeling of coil filament losses in 2D

L. Lehti, Janne Sami Keränen, S. Suuriniemi, T. Tarhasaari, L. Kettunen

    Research output: Contribution to journalArticleScientificpeer-review

    2 Citations (Scopus)

    Abstract

    Purpose: The authors aim to search for a practical and accurate way to get good loss estimates for coil filaments in electrical machines, for example transformers. At the moment including loss estimations into standard finite element computations is prohibitively expensive for large coils. Design/methodology/approach: A low-dimensional function space for finite element method (FEM) is introduced on the filament-air interface and then extended into the filament to significantly reduce the number of unknowns per filament. Careful choice of these extensions enables good loss estimate accuracy. The result is a system matrix assembly block that can be used verbatim for all filaments, further reducing the cost. Both net current and voltage per length of the filament are readily available in the problem formulation. Findings: The loss estimates from the developed model agree well with traditional FEM and the computation times are faster. Originality/value: To produce accurate loss estimates in large coils, the low-dimensional function space is constricted on the filament boundaries. The proposed method enables electrical engineers to compute the ohmic losses of individual conductors.
    Original languageEnglish
    Pages (from-to)1631-1642
    Number of pages11
    JournalCOMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering
    Volume32
    Issue number5
    DOIs
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Filament
    Coil
    Modeling
    Estimate
    Function Space
    Good Extension
    Finite element method
    Finite Element Method
    Electrical Machines
    Transformer
    Conductor
    Design Methodology
    Engineers
    Voltage
    Finite Element
    Moment
    Unknown
    Electric potential
    Air
    Formulation

    Keywords

    • coil modeling
    • electric coils
    • electrical equipment
    • FEM
    • finite element analysis
    • winding loss estimate

    Cite this

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    title = "Efficient modeling of coil filament losses in 2D",
    abstract = "Purpose: The authors aim to search for a practical and accurate way to get good loss estimates for coil filaments in electrical machines, for example transformers. At the moment including loss estimations into standard finite element computations is prohibitively expensive for large coils. Design/methodology/approach: A low-dimensional function space for finite element method (FEM) is introduced on the filament-air interface and then extended into the filament to significantly reduce the number of unknowns per filament. Careful choice of these extensions enables good loss estimate accuracy. The result is a system matrix assembly block that can be used verbatim for all filaments, further reducing the cost. Both net current and voltage per length of the filament are readily available in the problem formulation. Findings: The loss estimates from the developed model agree well with traditional FEM and the computation times are faster. Originality/value: To produce accurate loss estimates in large coils, the low-dimensional function space is constricted on the filament boundaries. The proposed method enables electrical engineers to compute the ohmic losses of individual conductors.",
    keywords = "coil modeling, electric coils, electrical equipment, FEM, finite element analysis, winding loss estimate",
    author = "L. Lehti and Ker{\"a}nen, {Janne Sami} and S. Suuriniemi and T. Tarhasaari and L. Kettunen",
    year = "2013",
    doi = "10.1108/COMPEL-04-2013-0129",
    language = "English",
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    Efficient modeling of coil filament losses in 2D. / Lehti, L.; Keränen, Janne Sami; Suuriniemi, S.; Tarhasaari, T.; Kettunen, L.

    In: COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, Vol. 32, No. 5, 2013, p. 1631-1642.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Efficient modeling of coil filament losses in 2D

    AU - Lehti, L.

    AU - Keränen, Janne Sami

    AU - Suuriniemi, S.

    AU - Tarhasaari, T.

    AU - Kettunen, L.

    PY - 2013

    Y1 - 2013

    N2 - Purpose: The authors aim to search for a practical and accurate way to get good loss estimates for coil filaments in electrical machines, for example transformers. At the moment including loss estimations into standard finite element computations is prohibitively expensive for large coils. Design/methodology/approach: A low-dimensional function space for finite element method (FEM) is introduced on the filament-air interface and then extended into the filament to significantly reduce the number of unknowns per filament. Careful choice of these extensions enables good loss estimate accuracy. The result is a system matrix assembly block that can be used verbatim for all filaments, further reducing the cost. Both net current and voltage per length of the filament are readily available in the problem formulation. Findings: The loss estimates from the developed model agree well with traditional FEM and the computation times are faster. Originality/value: To produce accurate loss estimates in large coils, the low-dimensional function space is constricted on the filament boundaries. The proposed method enables electrical engineers to compute the ohmic losses of individual conductors.

    AB - Purpose: The authors aim to search for a practical and accurate way to get good loss estimates for coil filaments in electrical machines, for example transformers. At the moment including loss estimations into standard finite element computations is prohibitively expensive for large coils. Design/methodology/approach: A low-dimensional function space for finite element method (FEM) is introduced on the filament-air interface and then extended into the filament to significantly reduce the number of unknowns per filament. Careful choice of these extensions enables good loss estimate accuracy. The result is a system matrix assembly block that can be used verbatim for all filaments, further reducing the cost. Both net current and voltage per length of the filament are readily available in the problem formulation. Findings: The loss estimates from the developed model agree well with traditional FEM and the computation times are faster. Originality/value: To produce accurate loss estimates in large coils, the low-dimensional function space is constricted on the filament boundaries. The proposed method enables electrical engineers to compute the ohmic losses of individual conductors.

    KW - coil modeling

    KW - electric coils

    KW - electrical equipment

    KW - FEM

    KW - finite element analysis

    KW - winding loss estimate

    U2 - 10.1108/COMPEL-04-2013-0129

    DO - 10.1108/COMPEL-04-2013-0129

    M3 - Article

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