In electrical motors electrical energy is transformed into mechanical energy or the other way around. Electrical energy has to be transferred from a stationary component into a moving one, which is done by a copper commutator in sliding contact with carbon brushes. Wear is occuring at surfaces of both components during dry sliding. For reduction of friction and wear rate solid lubricants are added to the carbon brush compositions. It was observed that during sliding a solid lubricant film is formed on the surface of the copper commutator. This transfer film has a limited life. After failure of the layer a new film is formed from the reservoir of the carbon brushes. Various solid lubricants in carbon brushes were tested. It was found, that certain solids form very thin layers with good adhesion on commutator surfaces, which improves tribological performance of both moving components. In particular wear rate, friction and noise is reduced significantly. This resulted in much longer service life of electrical motors for automotive applications.


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    Titel :

    Advancements of tribological performance of carbon brushes in electrical motors


    Weitere Titelangaben:

    Fortschritte auf dem Gebiet der tribologischen Wirksamkeit der Kohlebürsten in Elektromotoren


    Beteiligte:
    Groht, K. (Autor:in) / Heidenfelder, F. (Autor:in) / Holinski, R. (Autor:in)


    Erscheinungsdatum :

    2000


    Format / Umfang :

    5 Seiten, 7 Bilder, 1 Tabelle, 3 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





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    Letellier, P. / Institute of Marine Engineers| Institution of Mechanical Engineers | British Library Conference Proceedings | 1995