High-precision magnetic bearing axial control method based on interference observer

Abstract

The invention provides a method for controlling axial direction of a high-precision magnetic bearing based on an interference observer. The method consists of a controller and the interference observer, wherein the interference observer comprises a Q filter and a rationalization generalized object inverse QGn part; the controller in a control system calculates according to displacement deviation to obtain basic control quantity so as to form a position closed loop control system; an interference value obtained by observation of the interference observer is negatively fed back into the basic control quantity to compensate exterior interference; and the formed current control quantity drives power amplification to realize high precision suspension of the magnetic bearing. The method leads differences caused by both exterior interference and objective parameter variation to be equivalent to a control input end, and introduces equivalent compensation into the control quantity to realize interference inhabitation. The method can carry out online observation and effective inhabitation against exterior interference which is not modeled or known, thereby improving control precision of suspension, and contributing to stability of the system.

Description

technical field [0001] The invention relates to a magnetic bearing axial control method, which relates to disturbance observation and suppression technology in high-precision control, and can be used for high-precision control and disturbance suppression of magnetic bearings in a magnetic suspension control moment gyro system for online observation and automatic suppression of external disturbances. . Background technique [0002] Control Moment Gyroscope (CMG) is the key actuator for spacecraft attitude control. The high-speed magnetic bearing support in CMG is a key component, and there are usually two types of mechanical ball bearings and magnetic bearings. The magnetic suspension support method solves the wear and vibration problems caused by the mechanical support, has the advantages of long life, and allows the speed of the magnetic bearing to be greatly increased, and can significantly reduce the volume of the CMG under the premise of the same angular momentum. At t...

AI Technical Summary

Problems solved by technology

The biggest problem with these methods is that there is no online observation and compensation for unmeasurable and uncertain disturbances, such as carrier disturbances, external noise disturbances, etc. There is no special disturbance suppression, so these disturbances that affect the accuracy cannot be suppressed

At the same time, these methods cannot analyze the disturbance received in real time, and also lack the means of corresponding disturbance records and quantitative analysis.

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