Highpass digital filtering method of nutation frequency automatic tracking

A technology of nutation frequency and automatic tracking, applied in the direction of digital technology network, impedance network, electrical components, etc., can solve the problems of magnetic suspension bearing system impact, magnetic rotor nutation instability, cumbersome debugging process, etc., to achieve good filtering performance, The effect of simple debugging process

Inactive Publication Date: 2007-10-03
BEIHANG UNIV
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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 need

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[0021] The present invention mainly comprises five steps: rotor speed detection, K  Test, nutation frequency calculation, digital filter coefficient calculation, digital filtering. As shown in Figure 1, the hardware mainly includes three parts: Hall sensor 4, conditioning circuit 5, and DSP1. Rotational speed detection 6, nutation frequency calculation 2, digital filter coefficient calculation 7, and cross high-pass filter 3 are the internal parts of DSP1. algorithm. The rotational speed of the rotor is detected by the Hall sensor 4, and then sent to DSP1 after conditioning by the conditioning circuit 5, and the rotational speed Ω of the rotor is calculated by DSP1; the measured rotational speed Ω is substituted into the nutation frequency calculation formula (1) Online calculation of the nutation frequency f n , to realize automatic tracking of nutation frequency; with f n The coefficients of the digital filter are calculated for the cutoff frequency, and finally the onli...

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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...

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Application Information

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IPC IPC(8): H03H17/02G01M13/04
Inventor 房建成王宗省李海涛孙津济张峰
Owner BEIHANG UNIV
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