Device and method used for measuring axial and radial rigidity of magnetic suspension bearing

Abstract

The invention discloses a device and a method for measuring the rigidity of a magnetic suspension bearing. The device mainly comprises three precise electronic control displacement tables, a turn table, three laser displacement sensors, a six-degree of freedom force/moment sensor, a tool converter, a mounting converter, a right angle fixing frame, a reference measuring plane and the magnetic suspension bearing, wherein the three precise electronic control displacement tables are controlled through a personal computer (PC); a stator of the magnetic suspension bearing is enabled to move in a certain direction in the horizontal plane, and a rotor of the magnetic suspension bearing is enabled to move in a vertical direction; force-displacement data is obtained through measuring the force borne by the rotor at a certain steeping point and the displacement of the stator/rotor relative to an equilibrium point for the time being; and the data is relatively processed through a selected fitting model, and then the rigidity in different positions in the direction is obtained. The device has the advantages of high precision, flexible measurement, high automation degree, good maneuverability and the like.

Description

technical field [0001] The invention relates to a stiffness measurement device for a magnetic suspension bearing, in particular to a measurement device for permanent magnet stiffness and open-loop current stiffness of a disk-shaped magnetic suspension bearing. Background technique [0002] With the rapid increase of the speed of modern rotating machinery, the influence of the support on the stability, dynamic characteristics, and rotation accuracy of the rotor system is increasing, and it almost dominates the stability of the entire system in many occasions. As for the research on the support characteristics of the bearing, no matter what principle and method the bearing is applied to, in the final analysis it is to study its support stiffness and support damping. Only the stiffness that meets a certain standard can make the system run stably. Therefore, the stiffness measurement of the magnetic suspension bearing is a necessary step to ensure its normal and stable operation...

AI Technical Summary

Problems solved by technology

[0031] 1. The critical current method needs to judge whether the rotor is at the critical point, and the above-mentioned direct measurement method also needs to find the critical point of the applied force. Since the critical point is not easy to find, it can only be found by continuous testing; and the object at the critical point is not Stable, so the operation of the two methods is difficult, it is not easy to measure the stiffness of the magnetic suspension bearing at any position and any direction, and the accuracy of the measured stiffness is not high;

[0032] 2. The above-mentioned direct measurement method introduces static friction force, the measurement process is not easy to control, and the measurement accuracy is not high;

[0033] 3. The above two measurement methods can only measure the radial stiffness of the bearing, but cannot measure the axial stiffness;

[0034] 4. The degree of automation of the above two measurement methods is very low

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