Daimler Ag

Thomas Raumer

Lothar Rehm

In a control system and a method for operating a permanent-magnet electrical machine, when the electrical machine is switched off after one of a functional computer and a monitoring computer of the control system has identified a fault, in order to reduce the braking torque of the electrical machine, which is switched-off but still rotating an output stage of the control system is subjected to a three-phase short circuit if the rotation speed Ddoes not fall below a definable limit value GRor if a voltage U_DC of the output stage () exceeds a limit value Umax, and when the rotation speed Dis below the definable limit value GRand a voltage U_DC of the output stage does not exceed a limit value Umax, all the circuits breakers () of the output stage () are opened in order to fully disconnect the electrical machine from the output stage.

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Stuttgart, Germany

Thomas Raumer