Real-time monitoring method and system for fundamental frequency vibration signal of magnetic suspension rotor

By combining an adaptive notch filter and a phase-locked loop, the fundamental frequency vibration signal of a magnetically levitated rotor is monitored in real time. This solves the problem of insufficient accuracy and real-time performance of rotor imbalance vibration information in existing technologies, and achieves high-precision, low-latency rotor condition monitoring, which is suitable for high-speed variable-speed rotor systems.

CN122108589APending Publication Date: 2026-05-29WUHAN UNIV OF TECH
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Patent Information

Application Number
CN202610154629.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-03
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing magnetic levitation bearing systems suffer from insufficient accuracy and real-time performance of rotor imbalance vibration information under dynamic and highly disturbed conditions, affecting equipment stability and reliability. Existing methods rely on key phase sensor hardware and are subject to delays and interference.

Method used

An adaptive notch filter and phase-locked loop (PLL) combination method is adopted. The displacement sensor acquires the signal, suppresses harmonic interference and tracks the rotor fundamental frequency component in real time. The PLL unit acquires the instantaneous frequency and phase value, and the fundamental frequency vibration component is extracted by the synchronous demodulator to form the rotor unbalanced vibration state vector.

Benefits of technology

It achieves high-precision, millisecond-level delay tracking under strong harmonic interference and dynamic operating conditions, simplifies the system structure, reduces hardware costs, and improves the system's integration and reliability, making it suitable for high-speed variable speed rotor systems.

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Abstract

The invention provides a method and a system for monitoring fundamental frequency vibration signals of a magnetic suspension rotor in real time, and belongs to the technical field of magnetic suspension bearings. Comprising the following steps: acquiring an original displacement signal; a self-adaptive wave trap is adopted to preprocess the displacement signal; an initial voltage signal Vc is selected according to the real-time rotating speed frequency of the magnetic suspension rotor, the preprocessed displacement signals are input into a phase-locked loop unit, and the phase-locked loop unit is used for tracking a fundamental frequency component synchronous with the rotating speed in the displacement signals and outputting an instantaneous frequency value and an instantaneous phase value synchronous with the fundamental frequency component and two reference signals; configuring a synchronous demodulator, and extracting the real-time amplitude of the fundamental frequency vibration component based on the instantaneous frequency value, the instantaneous phase value, the two reference signals and the original displacement signal output by the phase-locked loop unit; and outputting a rotor unbalanced vibration state vector including the real-time amplitude, the real-time instantaneous phase value and the real-time instantaneous frequency value of the fundamental frequency vibration component.
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