Multi-physics simulations for electrical machine development

    Research output: Book/ReportReport

    Abstract

    In electrical machine R&D, like in other fields, different computation methods are needed for different purposes. For detailed analysis and product design, a multi-physical finite element (FEM) analysis is required. However, if advanced multi-objective optimisation of electromechanical devices is pursued, the computational burden of FEM analysis is too high, and more simple analytical models are needed. In this study, both alternatives are discussed. One hot topic in FEM computations has lately been the utilisation of open-source FEM tools. The benefits of open source can be found e.g. in massive parallel computation, more vast scripting possibilities, and possibility to tailor the software for special usage. Here, we study open-source FEM tools for three-dimensional (3D) electromagnetic and multi-physical simulation of electrical machines. The two most promising tools are Elmer and GetDP. We present two electrical machine test cases with Elmer. Elmer and GetDP are presently only opensource tools, which can solve 3D electromagnetic problems. However, they lack features needed for rotating electrical machine computations, e.g. they have limitations with the rotation model. The limitations are more severe in GetDP. The parallel performance of Elmer exceeds the results of GetDP, as GetDP utilises parallel computation only in linear solvers, whereas Elmer also in linear system assembly. Furthermore, in the test cases, Elmer shows a good parallel performance with rotating electrical machine models. Additionally, optimisation of electrical machines was studied. An analytical model implemented in MATLAB was used to represent an electrical machine in the optimisation process. Both single and multi-objective algorithms were tested in DAKOTA optimisation tool.
    Original languageEnglish
    PublisherVTT Technical Research Centre of Finland
    Number of pages18
    Publication statusPublished - 2015
    MoE publication typeD4 Published development or research report or study

    Publication series

    SeriesVTT Research Report
    VolumeVTT-R-04618-15

    Fingerprint

    Physics
    Analytical models
    Electromechanical devices
    Finite element method
    Multiobjective optimization
    Product design
    MATLAB
    Linear systems

    Keywords

    • electrical machines
    • FEM
    • open-source
    • Elmer
    • parallelisation
    • computation
    • simulation

    Cite this

    Keränen, J., Manninen, A., & Pippuri, J. (2015). Multi-physics simulations for electrical machine development. VTT Technical Research Centre of Finland. VTT Research Report, Vol.. VTT-R-04618-15
    Keränen, Janne ; Manninen, Aino ; Pippuri, Jenni. / Multi-physics simulations for electrical machine development. VTT Technical Research Centre of Finland, 2015. 18 p. (VTT Research Report, Vol. VTT-R-04618-15).
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    Keränen, J, Manninen, A & Pippuri, J 2015, Multi-physics simulations for electrical machine development. VTT Research Report, vol. VTT-R-04618-15, VTT Technical Research Centre of Finland.

    Multi-physics simulations for electrical machine development. / Keränen, Janne; Manninen, Aino; Pippuri, Jenni.

    VTT Technical Research Centre of Finland, 2015. 18 p. (VTT Research Report, Vol. VTT-R-04618-15).

    Research output: Book/ReportReport

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    N2 - In electrical machine R&D, like in other fields, different computation methods are needed for different purposes. For detailed analysis and product design, a multi-physical finite element (FEM) analysis is required. However, if advanced multi-objective optimisation of electromechanical devices is pursued, the computational burden of FEM analysis is too high, and more simple analytical models are needed. In this study, both alternatives are discussed. One hot topic in FEM computations has lately been the utilisation of open-source FEM tools. The benefits of open source can be found e.g. in massive parallel computation, more vast scripting possibilities, and possibility to tailor the software for special usage. Here, we study open-source FEM tools for three-dimensional (3D) electromagnetic and multi-physical simulation of electrical machines. The two most promising tools are Elmer and GetDP. We present two electrical machine test cases with Elmer. Elmer and GetDP are presently only opensource tools, which can solve 3D electromagnetic problems. However, they lack features needed for rotating electrical machine computations, e.g. they have limitations with the rotation model. The limitations are more severe in GetDP. The parallel performance of Elmer exceeds the results of GetDP, as GetDP utilises parallel computation only in linear solvers, whereas Elmer also in linear system assembly. Furthermore, in the test cases, Elmer shows a good parallel performance with rotating electrical machine models. Additionally, optimisation of electrical machines was studied. An analytical model implemented in MATLAB was used to represent an electrical machine in the optimisation process. Both single and multi-objective algorithms were tested in DAKOTA optimisation tool.

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    Keränen J, Manninen A, Pippuri J. Multi-physics simulations for electrical machine development. VTT Technical Research Centre of Finland, 2015. 18 p. (VTT Research Report, Vol. VTT-R-04618-15).