Abstract: The invention relates to an apparatus for determining a temperature of a rotor of an electric machine. The apparatus comprises an interface and a computing device. Input variables which are dependent on the operation of the electric machine are received via the interface. The computing device calculates, by means of a physical model, a first contribution to the heat transfer on the rotor on the basis of at least one of the input variables. In addition, the computing device calculates, by means of an artificial intelligence model, a second contribution to the heat transfer on the rotor on the basis of at least one of the input variables. The computing device calculates the temperature of the rotor on the basis of the first contribution and the second contribution to the heat transfer on the rotor.

Abstract: A method for determining a temperature of a component of an electric machine includes providing a plurality of trained neural networks, providing a current measurement of a plurality of operational parameters of the electric machine, and processing the operational parameters using the neural networks. The method further includes integrating output parameters issued by the neural networks over a time period, and issuing the integrated parameters as a temperature of the component.