Online dynamic balance system for detecting and controlling stator fixedly-connected magnetic suspension rotary joint

Abstract

The invention relates to an online dynamic balance system for detecting and controlling a stator fixedly-connected magnetic suspension rotary joint. The online dynamic balance system mainly comprises a full-period rotation control unit, a rotor system unit, a magnetic suspension control unit, a same-frequency current extraction unit, a correction quality calculation unit and a self-centering control unit. The full-period rotation control unit constructs a sine signal and a cosine signal which are synchronous with a rotor, provides the sine signal and the cosine signal to the self-centering control unit and the same-frequency current extraction unit, and meanwhile controls the rotor in the rotor system unit to rotate stably; the magnetic suspension control unit controls a rotor in the rotor system unit to suspend stably; the self-centering control unit is used for controlling a rotor suspension center in the rotor system unit to be a geometric axis of the rotor system unit and carrying out self-centering control on four radial channels of the rotor; the same-frequency current extraction unit extracts current components with the same frequency as a rotor in a magnetic bearing winding in the rotor system unit, namely winding same-frequency current components, and the correction mass calculation unit calculates the correction amount required for balancing the rotor according to the winding same-frequency current components.

Description

technical field [0001] The invention relates to an on-line dynamic balancing system of a detection and control stator fixed-connected magnetic suspension rotary joint, which is suitable for on-line dynamic balancing of a magnetic suspension system in which a sensor and a magnetic bearing are both on the stator. Background technique [0002] Compared with traditional mechanical bearings, magnetic suspension bearings have the characteristics of no contact, no wear, small vibration, and active control. They have broad application prospects in aerospace precision electromechanical products such as magnetic suspension flywheels, magnetic suspension control moment gyroscopes, and magnetic suspension rotary joints. [0003] The rotating part of the magnetic levitation rotary joint is a non-rotating body, and a variety of stand-alone equipment is installed on it, and its mass distribution cannot be accurately estimated and measured. At the same time, although the rotating speed of t...

AI Technical Summary

Problems solved by technology

These methods all require multiple start-ups to test the weight, which affects the balance efficiency

In addition, the existing balance methods mostly use vibration sensors to measure the unbalance, while the speed of the magnetic levitation rotary joint is extremely low, and the vibration is extremely small, which affects the balance accuracy

Although the deviation of the rotor rotation axis from the geometric axis can also be used to estimate the rotor unbalance (the offset between the rotor geometric axis and the inertial axis), it requires the support to be linear, and when the magnetic levitation rotor deviates from the magnetic center of the magnetic bearing The magnetic levitation support is nonlinear, which also affects the balance accuracy

[0006] To sum up, the unbalance of the maglev rotary joint is large, which seriously affects the control accuracy of the system. When the existing dynamic balance method is applied to the low-speed rotary body such as the rotary joint, it has the problems of low accuracy and low efficiency.

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