Method and Device for Operating an Electrical Machine in an Emergency Operating Mode

A device for providing an emergency operating mode of an electrical machine, wherein the electrical machine is operated with Q different phases that vary between a high-side potential and a low-side potential, wherein Q≥3, wherein the device is configured to, for a time point in a sequence of sequential time points:

• ascertain an angular value of an electrical rotor angle of the electrical machine at the time point;
• based on the angular value of the electrical rotor angle for each of the Q phases, ascertain whether the respective phase is intended to assume a high-side state or a low-side state;
• and
• for each of the Q phases, respectively generate a pulse sequence,
• wherein the pulse sequence for one phase respectively comprises one or more pulses of a respective pulse duration,
• the one or more pulses are sequentially executed with a given pulse frequency;
• the pulses assume the high-side potential in response to the respective phase being intended to assume the high-side state;
• and
• the pulses assume the low-side potential in response to the respective phase being intended to assume the low-side state.

A method for providing an emergency operating mode of an electrical machine, wherein the electrical machine is operated with Q different phases that vary between a high-side potential and a low-side potential, wherein Q≥3, wherein the method, for a time point in a sequence of sequential time points, comprises:

• ascertaining an angular value of an electrical rotor angle of the electrical machine at a respective time point;
• ascertaining, on a basis of the angular value of the electrical rotor angle, for each of the Q phases, as to whether the respective phase is intended to assume a high-side state or a low-side state;
• and
• generating a pulse sequence for each of the Q phases,
• wherein the pulse sequence for one phase respectively comprises one or more pulses, each having a pulse duration,
• wherein the one or more pulses occur sequentially at a pulse frequency,
• wherein the pulses assume the high-side potential in response to the respective phase being intended to assume the high-side state, and
• wherein the pulses assume the low-side potential in response to the phase being intended to assume the low-side state.