Highpass digital filtering method of nutation frequency automatic tracking

Abstract

A high pass digital filtering method of nutation frequency automatic track includes testing K phi phi without cross decoupling control, using Hall transducer to detect rotary speed of rotor and obtaining said rotary speed by microprocessor after regulation, substituting obtained rotary speed into nutation frequency calculation formula and on-line calculating out nutation frequency, using calculated out nutation frequency as cut-off frequency to design digital filter and inputting rotor displacement signal to carry out on-line filtering calculation.

Description

technical field [0001] The invention relates to a frequency self-tracking digital filtering method, in particular to a high-pass digital filtering method for nutating frequency automatic tracking, which can be used for cross-decoupling control of magnetic bearings in magnetic suspension control moment gyroscopes or magnetic suspension flywheel systems. Background technique [0002] Magnetic levitation cross decoupling control technology is an optimal solution to the problem of stable levitation of magnetic bearings. In this scheme, the precession signal and the nutation signal should be separated first, and then the precession and nutation should be controlled respectively. The frequency of the precession signal decreases with the increase of the rotor speed, and the frequency of the nutation signal increases with the increase of the rotor speed. There is no intersection between the two curves with the rotor speed. The nutation signal can be separated by using a crossover h...

AI Technical Summary

Problems solved by technology

This method continuously increases the cut-off frequency of the crossover high-pass filter with the increase of the rotor speed, so as to overcome the problem of the nutation instability of the magnetic rotor caused by the excessive phase lag of the cross-high-pass filter with a fixed cut-off frequency when the speed increases. question

There are two main disadvantages in adopting the segmented high-pass filter method: one is that the debugging process is cumbersome, and the rotor needs to be raised repeatedly to determine the switching frequency between the multi-stage high-pass filters; the other is that when two adjacent high-pass filters are switched , because the cut-off frequency changes suddenly, the phase and amplitude of the filtered nutation signal also change suddenly before and after switching, which will bring impact to the magnetic suspension bearing system and increase the unsafe factors that lead to the instability of the magnetic suspension bearing

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