Robert Boschgmbh

Michael Bangerter

Tino Merkel

Helge Sprenger

Thomas Zeltwanger

Alexander Rosen

The invention relates to a method and device for operating an electric machine () for outputting a predefined torque and a predefined rotational speed, comprising the following steps: providing () a first and a second operating mode for the operation of the electric machine (); detecting () a temperature of the electric machine (); and operating the electric machine () in the first operating mode () if the detected temperature falls below a threshold value, and operating the electric machine () in the second operating mode () if the detected temperature corresponds with the threshold value or exceeds same. During the operation of the electric machine () in the second operating mode (), with the resulting output of the predefined torque and the predefined rotational speed, the magnetic stator flux of the electric machine () is reduced compared with the magnetic stator flux of the electric machine () during the operation of the electric machine () in the first operating mode (), with the resulting output of the predefined torque and the predefined rotational speed.

Method and device for operating an electric machine for outputting a predefined torque and a predefined rotational speed

The invention relates to a method for controlling an electric machine () subjected to some extent to a reluctance moment in the event of a fault, said method involving the steps of detecting (S) a degree of demagnetization () of the electric machine () in the event of a fault, adjusting (S) a target value generation for controlling the electric machine () on the basis of the degree of demagnetization (), and controlling (S) the electric machine () on the basis of the adjusted target value generation. The invention further relates to a corresponding apparatus ().

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Oberriexingen, Germany

Michael Bangerter