In order to provide a method for limiting a torque of an electrical machine (200) which is fed by an at least single-phase converter (207) and is changed to an active short-circuit mode if the converter is controlled incorrectly and is changed to a freewheeling mode if a speed threshold (DS) is undershot, which method is particularly simple, it is proposed that • at least one instantaneous actual value of at least one phase current (12, 13) of the machine is detected in the active short-circuit mode, • a speed signal (D1, D2) containing an item of instantaneous speed information is derived from the at least one detected instantaneous actual value of the at least one phase current, • the instantaneous speed information of the speed signal is compared with the predefinable speed threshold, • as soon as the instantaneous speed information indicates a speed which undershoots the predefinable speed threshold, a changeover signal (U, U1, U2) for changing over from the active short-circuit mode to freewheeling is generated, and • the converter is controlled using this changeover signal. A particularly simple protective device (100) for limiting the torque for the electrical machine is likewise proposed.


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    Title :

    VERFAHREN UND SCHUTZVORRICHTUNG ZUR DREHMOMENTBEGRENZUNG FÜR EINE ELEKTRISCHE MASCHINE


    Additional title:

    METHOD AND PROTECTIVE DEVICE FOR LIMITING THE TORQUE FOR AN ELECTRICAL MACHINE
    PROCÉDÉ ET DISPOSITIF DE PROTECTION POUR LIMITER LE COUPLE D'UNE MACHINE ÉLECTRIQUE


    Contributors:

    Publication date :

    2020-11-18


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    German


    Classification :

    IPC:    H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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