A spinning unit and method for detecting changes of position of a shaftless spinning rotor (1) of an open-end spinning machine in a cavity of an active magnetic bearing, in which the position of the spinning rotor (1) is detected by a system of sensors (A, B) and on basis of the detected changes in the position of the spinning rotor (1) is adjusted controlling of the active magnetic bearing in order to eliminate undesirable changes in the position of the spinning rotor (1) in the cavity of the active magnetic bearing. Continuously is detected radial shifting of the spinning rotor (1) and simultaneously is continuously detected inclination of the spinning rotor (1), whereupon according to the detected changes in the position of the spinning rotor (1) is determined shifting and/or inclination of the spinning rotor (1) which is used for subsequent adjustment of the controlling of position of the spinning rotor (1) in the active magnetic bearing, wherein both radial shifting and inclination of the spinning rotor are each detected by at least two pairs of sensors of the distance of monitored surface of the spinning rotor, the pairs of sensors for detecting radial shifting of the spinning rotor detect changes of distances of the cylindrical wall of the spinning rotor from the sensors. The sensors (A, B) of the position of the spinning rotor (1) are grouped into pairs, whereby two pairs of sensors (A1, A2) for detecting of radial shifting of the spinning rotor (1) are arranged on the opposite sides of the spinning rotor (1) against the cylindrical wall (10) of the spinning rotor (1) and at the same time another two pairs of sensors (B1, B2) for detecting of inclination of the spinning rotor (1) are arranged on the opposite sides of the spinning rotor (1) against the wall (11) of the spinning rotor (1), which is perpendicular to the rotation axis (OA) of the spinning rotor (1).

A spinning unit and method for detecting changes of position of a shaftless spinning rotor (1) of an open-end spinning machine in a cavity of an active magnetic bearing, in which the position of the spinning rotor (1) is detected by a system of sensors (A, B) and on basis of the detected changes in the position of the spinning rotor (1) is adjusted controlling of the active magnetic bearing in order to eliminate undesirable changes in the position of the spinning rotor (1) in the cavity of the active magnetic bearing. Continuously is detected radial shifting of the spinning rotor (1) and simultaneously is continuously detected inclination of the spinning rotor (1), whereupon according to the detected changes in the position of the spinning rotor (1) is determined shifting and/or inclination of the spinning rotor (1) which is used for subsequent adjustment of the controlling of position of the spinning rotor (1) in the active magnetic bearing, wherein both radial shifting and inclination of the spinning rotor are each detected by at least two pairs of sensors of the distance of monitored surface of the spinning rotor, the pairs of sensors for detecting radial shifting of the spinning rotor detect changes of distances of the cylindrical wall of the spinning rotor from the sensors. The sensors (A, B) of the position of the spinning rotor (1) are grouped into pairs, whereby two pairs of sensors (A1, A2) for detecting of radial shifting of the spinning rotor (1) are arranged on the opposite sides of the spinning rotor (1) against the cylindrical wall (10) of the spinning rotor (1) and at the same time another two pairs of sensors (B1, B2) for detecting of inclination of the spinning rotor (1) are arranged on the opposite sides of the spinning rotor (1) against the wall (11) of the spinning rotor (1), which is perpendicular to the rotation axis (OA) of the spinning rotor (1).

With a method for the safe starting and/or stopping a rotor of a rotor spinning machine for the production of yarn, with a multiple number of rotors, each of which rotates in a rotor housing covered by a lid, each rotor is driven by its own motor and is held in at least one radially and/or axially active magnetic bearing by means of a position controller. A data connection of the motor is provided with a control unit, in order to drive the rotor in various operating states. There is a check of the control for driving the rotor, the position control for the one or more active magnetic bearings, the data connection for controlling the motor and/or the properly closed lid, and, in the event that predetermined target values and/or states are not met, the start of the rotor is blocked or the motor that is already running is selectively stopped. A rotor spinning machine is suitable for carrying out the method.

The invention relates to a method for operating a spinning machine with a multiple number of spinning stations, whereas, in the normal case, the individual spinning stations are supplied with a fiber material and produce a yarn from this, whereas, upon the occurrence of predefined events, yarn production is interrupted at any or all spinning stations, whereas the spinning stations at which yarn production has been interrupted are, when required, spun in with the assistance of a spinning-in process in order to once again start up yarn production, and whereas the respective spinning-in is carried out with the assistance of handling tools with their own spinning machines. In accordance with the invention, it is proposed that the individual spinning stations are classified on the basis of one or more production-related parameters, and that, if more spinning-in processes are to be carried out at the same time than can be carried out by the handling tools, at least the selection of the spinning station to be spun in next is carried out under consideration of the specified classification.

The invention relates to a method for operating a spinning machine with a multiple number of spinning stations, whereas, in the normal case, the individual spinning stations are supplied with a fiber material and produce a yarn from this, whereas, upon the occurrence of predefined events, yarn production is interrupted at any or all spinning stations, whereas the spinning stations at which yarn production has been interrupted are, when required, spun in with the assistance of a spinning-in process in order to once again start up yarn production, and whereas the respective spinning-in is carried out with the assistance of handling tools with their own spinning machines. In accordance with the invention, it is proposed that the individual spinning stations are classified on the basis of one or more production-related parameters, and that, if more spinning-in processes are to be carried out at the same time than can be carried out by the handling tools, at least the selection of the spinning station to be spun in next is carried out under consideration of the specified classification.