Method and device for the computer-assisted operation of an electric motor

A computer program, comprising a computer readable hardware storage device having computer readable program code stored therein, said program code executable by a processor of a computer system to implement a method comprising:

• receiving measurement data measured during the operation of the electric motor, wherein the measurement data are electrical and/or kinetic physical variables of the electric motor;
• determining at least one temperature value, approximated to a virtual real value, by means of a mathematical module, derived from a predefineable motor geometry, for physical variables of an overall state of the motor, and from the received measurement data as input data;
• predicting a number of temperature profiles with different restart times, wherein the temperature profiles are each dependent on the overall state of the electric motor and/or on a configuration of the electric motor, in order to define a cooling time period for reducing the thermal loading on the electric motor, wherein the approximated temperature value, which results from the at least one virtual real value, is input as a respective starting value for a restart into the temperature profile which is to be predicted;
• displaying a temperature profile which lies in the past, together with the number of predicted temperature profiles in a time/temperature diagram, wherein the number of predicted temperature profiles represents a possible restart of the electric motor at the respective restart time with the respectively determined starting value;
• determining a respective quality measure for the number of predicted temperature profiles, wherein the quality measure is a measure of the efficiency of how good the restart time is with respect to the expected thermal loading and a minimum of the cooling time period;
• and
• mapping the quality measures onto a color scale which is visually output at a user interface, wherein time information relating to the restart of the electric motor is output in response to a user interaction which is input via the user interface.

A device for the computer-assisted operation of an electric motor which is subjected, during an operation of the electric motor, to a thermal loading by a rotational motion of a rotor of the electric motor, the device comprising:

• a control unit which is designed:
• to receive measurement data measured during the operation of the electric motor, wherein the measurement data are electrical and/or kinetic physical variables of the electric motor;
• to determine at least one temperature value, approximated to a virtual real value, by means of a mathematical model, derived from a predefineable motor geometry, for physical variables of the overall state of the motor and from the received measurement data as input data;
• to predict a number of temperature profiles with different restart times, wherein the temperature profiles are each dependent on the overall state of the electric motor and/or on the configuration of the electric motor, in order to define a cooling time period for reducing the temperature loading on the electric motor, wherein the approximated temperature value, which results from at least one virtual real value, is input as a respective starting value for a restart into the temperature profile which is to be predicted;
• to map the quality measurements onto a color scale;
• and
• to determine a respective quality measure for the number of predicted temperature profiles, wherein the quality measure is a measure of the efficiency of how good the restart time is with respect to the expected thermal loading and a minimum of the cooling time period;
• a user interface which is designed
• to display the temperature profile, which lies in the past, together with the number of predicted temperature profiles in a time/temperature diagram, wherein the number of predicted temperature profiles represents a possible restart of the electric motor at the respective restart time with the respectively determined starting value;
• to output the color scale visually at the user interface, and to output time information relating to the restart of the electric motor to the control unit in response to a user interaction which is input via the user interface.