Dynamic Characteristics Analysis of Magnetic Levitation Rotor Considering Unbalanced Magnetic Pull

The working principle of the motor can cause unbalanced magnetic pull (UMP) between stator and rotor unavoidably. Previous research about nonlinear vibration excited by UMP was focused on the rotor supported by traditional mechanical bearings or gas bearings. However, the magnetic levitation rotor i...

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Bibliographic Details
Published in:Applied Computational Electromagnetics Society journal 2023-03, Vol.37 (10), p.1096
Main Authors: Zhang, Shuyue, Chen, Zaibin, Lva, Xiaolian, Yan, Hongli, Wu, Jihao, Zhou, Yuanliang
Format: Article
Language:English
Subjects:
Bearings
Control algorithms
Controllers
Dynamic characteristics
Electromagnetic forces
Equilibrium
Fault diagnosis
Feature recognition
Gas bearings
Magnetic bearings
Magnetic levitation
Magnetic pull
Numerical analysis
Numerical methods
Parameters
Permeability
Response spectra
Rotor dynamics
Vibration
Vibration analysis
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Summary:The working principle of the motor can cause unbalanced magnetic pull (UMP) between stator and rotor unavoidably. Previous research about nonlinear vibration excited by UMP was focused on the rotor supported by traditional mechanical bearings or gas bearings. However, the magnetic levitation rotor is particular due to the low rigidity provided by the active magnetic bearing (AMB). UMP amplifies rotor vibration in the resonant zone and further excites the nonlinear electromagnetic force, thus producing different vibration phenomena. The paper calculates rotor orbit, spectra analysis, and time-history plot with numerical methods and studies the influence of the rotation speed, eccentricity, key control parameters, and UMP on rotor dynamics in detail. Results illustrate displacement response spectra of the magnetic levitation rotor are quite different from previous research results. The appearing frequency components are inducted by universal formulas in this paper. Furthermore, research shows a slight adjustment of the control parameters affect significantly harmonic components and vibration characteristics. The research results have practical reference significance for fault diagnosis, feature recognition, and controller optimization of the AMB-rotor system.
ISSN:1054-4887
1943-5711
DOI:10.13052/2022.ACES.J.371010