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A constant-amplitude phase compensation method for suppressing nutation frequency

A technology of nutation frequency and phase compensation, applied in the field of amplitude and phase compensation, can solve the problems of lack of cross feedback parameter design method, unfavorable setting, and many control parameters, so as to improve control accuracy and anti-interference ability, facilitate setting, and control algorithm simple effect

Active Publication Date: 2020-09-01
BEIHANG UNIV
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Problems solved by technology

At present, for the suppression of the nutation mode of the rotor (whether it is symmetrical or asymmetrical), most of them adopt the cross-feedback method or the improved method based on cross-feedback, which essentially suppresses the nutation mode by providing an advanced phase, but this The method has many control parameters (in addition to PID control parameters, there are filter coefficients, cross ratio coefficients, speed signals, etc.) and lacks an effective cross feedback parameter design method, which is not conducive to system tuning

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  • A constant-amplitude phase compensation method for suppressing nutation frequency
  • A constant-amplitude phase compensation method for suppressing nutation frequency
  • A constant-amplitude phase compensation method for suppressing nutation frequency

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0054] Such as figure 1 , 2 As shown, the concrete steps of a kind of equal-amplitude phase compensation method for suppressing the nutation frequency of the present invention are as follows:

[0055] (1) if figure 1 As shown, the present invention analyzes the control torque generated by the magnetic bearing control force of each channel when the rotor deflects around the x-axis and y-axis under the closed-loop control condition for the magnetic suspension flat rotor system. In order to describe the mutual position among the composite rotor, displacement sensor and active magnetic bearing, a center of mass coordinate system Oxyz is established, where the origin of the coordinates is the center of mass of the composite rotor, the z axis is on the line connecting the centers of the two radial magnetic bearings, and the x , y, z axes form a ri...

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Abstract

The invention relates to an equal amplitude phase compensation method for suppressing a nutation frequency. The influence of the nutation frequency of a high-speed composite rotor of a magnetic suspension molecular pump on the stability is suppressed, the phase margin at the nutation frequency is improved, the amplitude is constant to be 1, an extreme frequency is analyzed by an extreme frequencymethod, and a maximum compensation phase is obtained. The method has the advantage of not changing a system gain and not lowering high and low frequency phases and can be used for improving the stability of the nutation frequency of the magnetic suspension rotor at a high speed, and the nutation instability of a magnetic suspension molecular pump composite rotor at a high speed is avoided.

Description

technical field [0001] The invention relates to the technical field of magnetic levitation composite rotor system, in particular to a constant-amplitude phase compensation method for suppressing nutation frequency, which can be used to improve the stability of the nutation mode of the magnetic levitation rotor at high speed, and avoid the high speed of the magnetic levitation molecular pump compound rotor The lower nutation is unstable. Background technique [0002] As a new type of supporting component, magnetic suspension bearing has the advantages of no contact friction, no lubrication, high efficiency and cleaning, and high speed compared with traditional bearings. It has been successfully applied in vacuum equipment, aerospace and power fields. According to the moment of inertia ratio, rotors can be divided into flat type and slender type. Flat rotors are widely used in magnetic levitation molecular pumps, magnetic levitation energy storage flywheels, and magnetic levit...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B11/42
CPCG05B11/42
Inventor 刘刚李金磊郑世强孙茂林韩邦成陈诚
Owner BEIHANG UNIV
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