An electromagnetic speedsensor has been developed for use in automatic-train control on London Transport railways. The primary sensing element is a composite ferromagnetic-conductive rotor which introduces amplitude modulation, with frequency proportional to train speed, into a fixed audiofrequency carrier. A number of discrete rotational speeds are then defined by demodulation and low-pass filtering. An override system, operating by reducing the amplitdue of a further AC signal with increasing train speed, provides integrity at low speeds, and a magnetic voltage reference unit maintains the power supply within predetermined safe limits. Fail-safe design principles are applied extensively on both component and system levels.


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    Titel :

    Fail-safe speed sensor for London Transport automatic trains


    Weitere Titelangaben:

    Betriebssicherer Drehzahlgeber fuer London Transport automatic trains


    Beteiligte:
    Hill, R.J. (Autor:in)


    Erscheinungsdatum :

    1981


    Format / Umfang :

    8 Seiten, 10 Bilder, 1 Tabelle, 19 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





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