METHOD FOR THE TEMPERATURE DERATING OF ELECTRICAL MACHINES

In order to provide a method for limiting the temperature in an electrical machine, wherein the retrieval of higher drive powers is briefly allowed after a predetermined permanent temperature has been exceeded, it is proposed to determine the temperature φ in the electrical machine, to allow a further temperature increase in a period calculated by a controller after a predetermined permanent temperature φDauer has been exceeded and to reduce the power and/or the torque and/or at least one phase current of the electrical machine after expiry of this period. In order to briefly achieve higher drive powers of an electrical machine, exceeding of the permanent temperature φDauer is allowed for an implicitly or explicitly defined limited duration and the torque, the power and/or at least one phase current of the electrical machine is/are reduced uniformly (that is to say not abruptly) after expiry of this time.