Device for controlling the radial orientation of a rapidly rotating rotor supported in a contactless manner

DETAILED DESCRIPTION The present invention seeks to address the problem of improving the attitude control of rotors which are supported in a contactless manner.
The invention addresses this problem by providing a sensor device for the continuous generation of rotor attitude signals and a control device for processing the rotor attitude signals.
The control device includes a controller that outputs a rotary-frequency-dependent output resultant signal or correcting variable, generated from the rotor attitude signals, for controlling the actuating device.
The resultant signal follows the rotary-frequent waveform of the controller output signal at frequencies below the resonance frequencies of the contactless support, while above these resonance frequencies the resultant signal increasingly follows the rotary-frequent waveform of the controller output signal only in the area of at least one of the two extreme values (i.
e.
, the minimum and maximum values) of the waveform, whereby the amplitude of the resultant signal is distinctly smaller than the amplitude of the rotary-frequency-dependent controller output signal.
Further, the resultant signal of the rotary-frequency-dependent oscillation maps superposed oscillations of the controller output signal that are low-frequency in comparison to it in a practically unchanged manner.
Such a control device permits, upon the occurrence of rather high oscillatory frequencies, the lowering of the oscillation amplitudes of the oscillation dependent on the rotary frequency with small phase errors at the same time as regards the relatively low resonance frequencies and therewith permits an advantageous reduction of the power consumption of the attitude control as well as increased quietness of the rotor without customary suppression filters and without the above-mentioned disadvantages of the state of the art.
The small phase errors that occur thereby do not endanger the stability of the control and are tolerable.
On the other hand, the phase rotation that can be produced by customary deep-pass filters is significantly greater