A Vibration Moment Suppression Method for Magnetic Bearings Based on Complex Variable Finite-Dimensional Repeated Control

Abstract

The invention discloses a magnetic bearing vibration moment suppression method based on complex variable finite-dimensional repetitive control. The method includes the following steps: firstly, a dynamic model of a magnetic levitation rotor rotation system including rotor dynamic unbalance and displacement sensor harmonic noise is established; and then A magnetic bearing vibration torque suppression algorithm based on parallel complex variable finite-dimensional repetitive control is designed; finally, parameters of the same-frequency and double-frequency vibration torque suppressors are designed according to the dual-frequency Bode diagram of the complex variable system function, so as to ensure the stability of the closed-loop system. Vibration moment suppression of gyro effect magnetic bearing system. The present invention adopts the parallel-connected finite-dimensional repetitive control to overcome the shortcomings of the series-connected ones, such as signal amplification at non-harmonic frequencies and phase lag, which cause system stability to deteriorate; the controller parameters are designed by using the dual-frequency Bode diagram of the complex variable system function, and the intensity is reduced. The complexity of parameter design under the gyro effect; in addition, the influence of the low-pass characteristics of the power amplifier system is fully considered to improve the vibration torque suppression accuracy.

Description

technical field [0001] The invention belongs to the field of active vibration control of magnetic bearing systems, in particular to a method for suppressing vibration torque of magnetic bearings based on complex variable finite-dimensional repetitive control, which is used for vibration torque of magnetic bearing systems with strong gyro effect including rotor unbalance and sensor harmonic noise inhibition. Background technique [0002] Compared with traditional mechanical bearings, oil film bearings and sliding bearings, magnetic bearings have the advantages of no mechanical contact, no wear, long life and high precision. The most prominent thing is that magnetic bearings can adjust their own stiffness coefficient and damping coefficient to achieve active vibration control. . Through active vibration control, a control force is applied to the magnetic levitation rotor to make the rotor rotate around its geometric axis to achieve high-precision control; it can also realize ...

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Problems solved by technology

In order to suppress the vibration torque of the magnetic bearing system, it is necessary to take the bearing torque as the controlled quantity, and it is impossible to use the general plug-in series finite-dimensional repetitive control

In addition, the amplitude gain of the signal at the non-multiplied frequency of the serial finite-dimensional repetitive control is not zero, which affects the vibration torque suppression accuracy of the magnetic bearing system; and there is a certain phase lag at the non-multiplied frequency, which has a relatively small impact on the stability of the closed-loop system. Big

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