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.
VERFAHREN UND SCHUTZVORRICHTUNG ZUR DREHMOMENTBEGRENZUNG FÜR EINE ELEKTRISCHE MASCHINE
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
2020-11-18
Patent
Electronic Resource
German
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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