Method of determining changes in position of open-end spinning machine spinning rotor within a cavity of an active magnetic bearing and spinning unit of the a rotor spinning machine with active magnetic bearing for mounting spindleless spinning rotor

摘要

In the method of detecting changes, the position of the spinning rotor (1) is monitored by a set of sensors (A, B) and based on the detected changes in the position of the spinning rotor (1), the control of the active magnetic bearing is eliminated to eliminate undesirable changes in the position of the spinning rotor (1) in the active cavity. magnetic bearing. The radial displacement of the spinning rotor (1) is continuously detected and the inclination of the spinning rotor (1) is continuously detected. Depending on the detected changes in the position of the spinning rotor (1), the displacement and / or inclination of the spinning rotor (1) is determined to subsequently control the position of the spinning rotor (1) in the active magnetic bearing. The active magnetic bearing spinning unit comprises means for generating and controlling a magnetic field in which the spinning rotor (1) is arranged. The bearing further comprises sensors (A, B) of the position of the spinning rotor (1) which are coupled to the detectors (D) of their output signals and to the evaluation circuits. The evaluation circuits are connected to the active magnetic bearing control system. The position sensors of the spinning rotor (1) are grouped into pairs, wherein two pairs of sensors (A, A1, A2) for detecting the radial displacement of the spinning rotor (1) are arranged on opposite sides of the spinning rotor (1) against the cylindrical wall (10) of the spinning rotor (1) and at the same time two pairs of sensors (B, B1, B2) for determining the inclination of the spinning rotor (1) are arranged on opposite sides of the spinning rotor (1) against the wall (11) of the spinning rotor (1) which is perpendicular to the axis of rotation (OA) of the spinning rotor (1).