Verfahren und Gerät zur Steuerung eines Magnetlagers

摘要

A controller of a magnetic bearing controls the rotor speed with a reduced drive current while suppressing rotor vibrations. In addition to the basic Proportional, Integral and Derivative (PID) control (4X,4Y), the controller implements further control methods to ensure the stable operation of the rotor, even at rotor resonance frequencies. An automatic balancing system ("ABS", gain beta ) is applied in conjunction with at least one of: N-cross control system (cross coupling, synchronous with rotor speed, gain alpha ); N-straight control (no cross-coupling, but synchronous, gain delta ); Feed Forward (FF, gain gamma ) control where a control current is applied to generate vibrations equal and opposite to those created by the rotor. A computer (20) in the controller determines the activation of each control method in accordance with a predetermined control plan in response to the detected rotor speed by varying the control parameters alpha , beta , gamma , delta .