Time-harmonic finite-element analysis of eddy currents in the form-wound stator winding of a cage induction motor

M. Jahirul Islam, J. Pippuri, J. Perho, A. Arkkio

    Research output: Contribution to journalArticleScientificpeer-review

    19 Citations (Scopus)

    Abstract

    A finite-element model for calculation of eddy-current and circulating current losses in a multi-conductor stator winding of a cage induction motor is presented. In this model, the eddy current formulation of the series and parallel connected stator bars is solved together with the circuit and field equations using a two-dimensional time-harmonic approximation. The Newton-Raphson method is applied to solve the total system of nonlinear equations. The finite-element mesh is discretised finely enough in order to take the phenomena correctly into account. The eddy-current loss distribution of the stator bars and the quantitative results of eddy-current and circulating current losses have been studied with two different conductor arrangements inside the stator slots. The results show that the eddy-current loss in the stator winding is one of the most significant loss components. They also show that the radial position of the stator bars has a remarkable effect on the losses. The radial flux that passes through the stator bars can be guided to stator teeth by using magnetic slot wedge material to reduce the eddy-current loss.

    Original languageEnglish
    Pages (from-to)839-846
    Number of pages8
    JournalIET Electric Power Applications
    Volume1
    Issue number5
    DOIs
    Publication statusPublished - 24 Aug 2007
    MoE publication typeNot Eligible

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    Eddy currents
    Induction motors
    Stators
    Finite element method
    Newton-Raphson method
    Nonlinear equations
    Fluxes
    Networks (circuits)

    Cite this

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    title = "Time-harmonic finite-element analysis of eddy currents in the form-wound stator winding of a cage induction motor",
    abstract = "A finite-element model for calculation of eddy-current and circulating current losses in a multi-conductor stator winding of a cage induction motor is presented. In this model, the eddy current formulation of the series and parallel connected stator bars is solved together with the circuit and field equations using a two-dimensional time-harmonic approximation. The Newton-Raphson method is applied to solve the total system of nonlinear equations. The finite-element mesh is discretised finely enough in order to take the phenomena correctly into account. The eddy-current loss distribution of the stator bars and the quantitative results of eddy-current and circulating current losses have been studied with two different conductor arrangements inside the stator slots. The results show that the eddy-current loss in the stator winding is one of the most significant loss components. They also show that the radial position of the stator bars has a remarkable effect on the losses. The radial flux that passes through the stator bars can be guided to stator teeth by using magnetic slot wedge material to reduce the eddy-current loss.",
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    Time-harmonic finite-element analysis of eddy currents in the form-wound stator winding of a cage induction motor. / Islam, M. Jahirul; Pippuri, J.; Perho, J.; Arkkio, A.

    In: IET Electric Power Applications, Vol. 1, No. 5, 24.08.2007, p. 839-846.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Time-harmonic finite-element analysis of eddy currents in the form-wound stator winding of a cage induction motor

    AU - Islam, M. Jahirul

    AU - Pippuri, J.

    AU - Perho, J.

    AU - Arkkio, A.

    PY - 2007/8/24

    Y1 - 2007/8/24

    N2 - A finite-element model for calculation of eddy-current and circulating current losses in a multi-conductor stator winding of a cage induction motor is presented. In this model, the eddy current formulation of the series and parallel connected stator bars is solved together with the circuit and field equations using a two-dimensional time-harmonic approximation. The Newton-Raphson method is applied to solve the total system of nonlinear equations. The finite-element mesh is discretised finely enough in order to take the phenomena correctly into account. The eddy-current loss distribution of the stator bars and the quantitative results of eddy-current and circulating current losses have been studied with two different conductor arrangements inside the stator slots. The results show that the eddy-current loss in the stator winding is one of the most significant loss components. They also show that the radial position of the stator bars has a remarkable effect on the losses. The radial flux that passes through the stator bars can be guided to stator teeth by using magnetic slot wedge material to reduce the eddy-current loss.

    AB - A finite-element model for calculation of eddy-current and circulating current losses in a multi-conductor stator winding of a cage induction motor is presented. In this model, the eddy current formulation of the series and parallel connected stator bars is solved together with the circuit and field equations using a two-dimensional time-harmonic approximation. The Newton-Raphson method is applied to solve the total system of nonlinear equations. The finite-element mesh is discretised finely enough in order to take the phenomena correctly into account. The eddy-current loss distribution of the stator bars and the quantitative results of eddy-current and circulating current losses have been studied with two different conductor arrangements inside the stator slots. The results show that the eddy-current loss in the stator winding is one of the most significant loss components. They also show that the radial position of the stator bars has a remarkable effect on the losses. The radial flux that passes through the stator bars can be guided to stator teeth by using magnetic slot wedge material to reduce the eddy-current loss.

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