Displacement Detection Circuit and Displacement Self-sensing System of Magnetic Suspension Rotor System

Abstract

The invention discloses a displacement detection circuit of a magnetic levitation rotor system and a displacement self-sensing system thereof. The displacement detection circuit includes a current sampling circuit for collecting current flowing through corresponding coils; the coils are coils distributed in series in the magnetic levitation rotor system; Hall sensors, Hall sensors are installed in the upper air gap and the lower air gap of the magnetic levitation rotor system, the sensing surface of the Hall sensor is perpendicular to the direction of the magnetic field in the corresponding auxiliary air gap; the Hall signal processing circuit, and The Hall sensor connection is used for differential processing of the Hall induction signal corresponding to the upper auxiliary air gap and the Hall induction signal corresponding to the lower auxiliary air gap; the displacement signal calculation circuit is connected with the current sampling circuit and the Hall signal processing circuit respectively Connection, used to obtain the displacement of the rotor in the magnetic levitation rotor system according to the current and differential processing results. Through the technical scheme of the invention, the axial dimension of the rotor is shortened, so that the detection and control are on the same plane, with high precision and simple design.

Description

Technical field [0001] Embodiments of the present invention relate to the field of magnetic levitation bearing, and more particularly to a displacement detection circuit of a magnetic suspension rotor system and a displacement from a sensor system. Background technique [0002] The magnetic levitation bearing has the characteristics of contactless friction, high speed and no lubrication, and the magnetic levitation rotor system itself can achieve active vibration control, no additional hardware device, magnetic levitation rotor system, therefore also obtained the ground observation of the satellite and space telescope A wide range of applications. In order to achieve high precision control of the magnetic suspension rotor, it is necessary to accurately obtain the position of the rotor relative to the stator. [0003] The development of various high-resolution satellites has higher requirements for the stability and vibration of the magnetic levitation control system. Due to the c...

AI Technical Summary

Problems solved by technology

The traditional displacement sensor needs to select the detection surface separately, which not only increases the axial size of the rotor, but also the displacement detection and control are not in the same plane, which makes the displacement detection error, and the traditional displacement sensor has high cost and poor reliability

In addition, the traditional displacement self-sensing magnetic bearing only estimates the rotor position by extracting the components in the current ripple. In order to ensure the accuracy of component estimation, a complex extraction circuit needs to be designed, so that the traditional displacement detection method limits the vibration of the magnetic levitation system. performance improvement

Images