The terminal voltage of a short-primary linear motor form an unbalanced three-phase system containing zerosequence components, whereas the phase currents contain considerable negative-sequence components. These phenomena cannot be caused by end effects due to the finite motor length. The load-dependent additional components can be measured very well at zero speed. From the results of those experiments the performance of a motor supplied with a balanced system of currents can be deduced. The additional voltage components for this case can be accounted for by adding appropriate resistances to an equivalent circuit of the motor. This procedure enables a better determination of the overall performance of the motor as well as the additional losses. It has been found out, that this discrepancy is caused by the fact that different amounts of end winding leakage flux are linked by the coil ends of the three phase windings, thus causing the leakage reactances of the three phases to be different. Furthermore, it appears to be possible to take this additional voltage components into account by introducing appropriate resistances, henceforth assuming the leakage reactances proper to be equal. This approach yields excellent results, even if the machine is fed from a balanced voltage supply. In that case a negative-sequence current system is generated, both amplitude and phase of which can be predicted with acceptable accuracy. Similarly, the way the power taken from the supply is distributed within the machine can be determined fairly well.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Effects of unbalanced leakage reactances of linear motors


    Weitere Titelangaben:

    Die Auswirkung der ungleichmaessigen Streureaktanzen in Kurzstator-Linearmotoren


    Beteiligte:
    Deleroi, W. (Autor:in) / Paap, G.C. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1982


    Format / Umfang :

    4 Seiten, 9 Bilder, 3 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Ultra-Wideband Wave Reactances of Capacitive Grids

    Sauleau, R. / Falola, N. | British Library Online Contents | 2004


    The reactances of the double star synchronous machine

    Kotny, J.L. / Lesenne, J. / Wiart, A. | Tema Archiv | 1985


    Analysis of Synchronous Reactances as a Function of Airgap MMF

    Lopez, M.A.Arjona | Online Contents | 2002



    Linear motors

    Tema Archiv | 1974