Method for optimizing the production of a rotor spinning machine

A rotor spinning machine, comprising:

• a plurality of spinning units, each spinning unit comprising:
• a spinning rotor with a rotor drive wherein the spinning rotor is driven with a variable rotor speed during operation of the rotor spinning machine;
• a draw-off device by which a produced yarn is removed from the spinning unit at a delivery speed;
• wherein a current energy consumption of the spinning units or the rotor spinning machine is continuously calculated;
• a control unit configured to regulate the delivery speed within a permissible range having a minimum delivery speed and a maximum delivery speed based on the current energy consumption in a manner such that a minimum energy consumption is achieved;
• and
• wherein the control unit is configured to regulate current delivery speed as a function of the current energy consumption in such a manner that a minimum energy consumption is achieved by decreasing the delivery speed from the starting delivery speed until the minimum energy consumption is reached and only increasing the delivery speed when the minimum delivery speed has been reached or an increase in energy consumption results from operation at the decreased delivery speed.