Gkn Automotive Gmbh

Tobias Gemassmer

Rudolf Fitz

Enrique Cordero

Florian Sontheim

Tobias Egbers

Nico Maurin

A drive arrangement comprising an electric motor can be operated. The drive arrangement comprises the electric motor, an electrical circuit for operating the electric motor, and a control device for actuating the electrical circuit; wherein the electric motor has at least one stator comprising at least three coils and a rotor comprising at least two magnetic poles; wherein the electrical circuit has at least a first potential connection and a second potential connection, which can be connected to different potentials of a DC voltage source; wherein the electrical circuit comprises three half-bridges between the potential connections, wherein each coil is electrically conductively connected to each half-bridge via a respective first connection and to the other coils via a respective second connection.

Method for operating a drive arrangement

A method for operating an electrical machine is used to calculate a value of a first torque which can be provided at a maximum by the electrical machine in a future interval, wherein, by limiting the torque which is provided in the interval to the value, overheating of at least one semiconductor, which is required for transmitting the electrical power, due to a power loss is prevented and/or the threat of overheating and the onset of derating is diagnosed and therefore prevented.

Operating an electrical machine

For the field-oriented control of a permanently excited synchronous machine with reluctance torque a flux-generating current component and a torque-generating current component are determined as a function of a required torque. A voltage component in the flux direction is determined as a function of the flux-generating current component, and a voltage component perpendicular to the flux direction is determined as a function of the torque-generating current component. Upon determining a differential amount by subtracting a vectorial sum of the voltage components from a maximum voltage a first differential value is obtain, via output from a PI-voltage controller, based on the differential amount. Upon determining an input voltage component based on the flux-generating current component and the first differential value, the permanently excited synchronous machine is controlled based on the input voltage component.

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Bonn, Germany

Tobias Gemassmer