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Home > Issues > SearchPerformance Comparison of Analytical Models for Rotor Eccentricity: A Case Study of Active Magnetic Bearing
Journal of Magnetics, Volume 25, Number 2, 30 Jun 2020, Pages 285-292
Zhi Cao (Southeast University, School of Electrical Engineering), Yunkai Huang * 
(Southeast University, School of Electrical Engineering), Baocheng Guo (State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology), Jianning Dong (Delft University of Technology, Department of Electrical Sustainable Energy), Fei Peng (Southeast University, School of Electrical Engineering)
(Southeast University, School of Electrical Engineering), Baocheng Guo (State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology), Jianning Dong (Delft University of Technology, Department of Electrical Sustainable Energy), Fei Peng (Southeast University, School of Electrical Engineering)
Abstract
This paper applies two different analytical methods, i.e., the perturbation method and superposition method, to
calculate the magnetic flux density distribution and the magnetic force of the active magnetic bearing (AMB)
with the rotor eccentricity. These two methods are thoroughly analyzed, compared and validated by the finite
element model (FEM). The perturbation method is theoretically complex while the superposition method is
intuitive. The valid range of the superposition method is larger than the perturbation method. However, the
superposition method requires longer computation time. The main contribution of this paper is assessing the
effectiveness of two analytical methods for predicting the AMB performance with the rotor eccentricity and
giving a comprehensive guideline for engineers to choose the proper analytical method to design AMB.
calculate the magnetic flux density distribution and the magnetic force of the active magnetic bearing (AMB)
with the rotor eccentricity. These two methods are thoroughly analyzed, compared and validated by the finite
element model (FEM). The perturbation method is theoretically complex while the superposition method is
intuitive. The valid range of the superposition method is larger than the perturbation method. However, the
superposition method requires longer computation time. The main contribution of this paper is assessing the
effectiveness of two analytical methods for predicting the AMB performance with the rotor eccentricity and
giving a comprehensive guideline for engineers to choose the proper analytical method to design AMB.
Keywords: Active magnetic bearing (AMB); analytical models; sub-domain method; perturbation method; superposition
DOI: https://doi.org/10.4283/JMAG.2020.25.2.285
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