Method for determining a rotor frequency and/or a rotor angle of a rotor of a reluctance machine, control device, and drive assembly

A control device for a converter of a reluctance machine, comprising:

• at least one meter and/or one detector for determining a rotor frequency and/or a rotor angle of a rotor of the reluctance machine, said at least one meter and/or one detector determining maximum values for a measured electric current and/or a time interval between at least two adjacent maxima of a temporal course of the electric current, said control device, by operating the at least one meter and/or the one detector is configured to:
• apply a temporal sequence of voltage pulses to a stator winding of a stator of the reluctance machine via a frequency converter by alternately outputting a voltage value of a fixed amount and a fixed direction and a pulse block in a sequential repetition;
• and
• determine the rotor frequency and/or the rotor angle of the rotor of the reluctance machine by measuring a sequential pulse response of the electric current via an evaluating device, said electric current having a negative-phase component representing a part of the electric current changing as a function of the rotor angle and a positive-phase component representing a part of the electric current not undergoing a change as a function of the rotor angle, wherein the sequential pulse response of the electric current, which flows in the stator winding is generated as a result of the voltage pulses, and a flux is thereby sequentially generated from the voltage pulses as a result of the rotor having a magnetically anisotropic rotor core.

A drive assembly, comprising:

• a reluctance machine;
• a converter electrically connected to the reluctance machine;
• and
• a control device for controlling the converter, said control device including at least one meter and/or one detector for determining a rotor frequency and/or a rotor angle of a rotor of the reluctance machine, said at least one meter and/or one detector determining maximum values for a measured electric current and/or a time interval between at least two adjacent maxima of a temporal course of the electric current, said control device, by operating the at least one meter and/or the one detector is configured to:
• apply a temporal sequence of voltage pulses to a stator winding of a stator of the reluctance machine via a frequency converter by alternately outputting a voltage value of a fixed amount and a fixed direction and a pulse block in a sequential repetition;
• and
• determine the rotor frequency and/or the rotor angle of the rotor of the reluctance machine by measuring a sequential pulse response of the electric current via an evaluating device, said electric current having a negative-phase component representing a part of the electric current changing as a function of the rotor angle and a positive-phase component representing a part of the electric current not undergoing a change as a function of the rotor angle, wherein the sequential pulse response of the electric current, which flows in the stator winding is generated as a result of the voltage pulses, and a flux is thereby sequentially generated from the voltage pulses as a result of the rotor having a magnetically anisotropic rotor core.