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An Improved Radial Displacement Control Considering Mass Difference Between Two Shaft Ends to Increase the Rotor Fatigue Life

Lookup NU author(s): Dr Xu DengORCiD

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Abstract

© 1986-2012 IEEE.Notch filters (NFs) are widely applied in the five-degrees of freedom (5-DoFs) magnetic levitation motors to reduce the vibration near the resonant frequency. However, due to the existence of axial thrust disk, rotor masses at the two ends of the shaft are generally different. It not only increases the difficulty of NF design, but also reduces of fatigue life of rotor system. Therefore, a cross displacement control (CDC) method is proposed in this paper to synchronize the displacements at the two ends, which reduces the number of NFs and improves the fatigue life of rotor system. Simulation and experimental results show that the fatigue life of rotor system can be improved by 17.70 times, 21% and 10% at 4000 r/min, 10000 r/min and 20000 r/min, respectively. On the basis of that, the phase-shift NF can also be added to reduce the vibration near the resonant frequency. Experimental results verify that the fatigue life of rotor system can be improved by 26.5% near the resonant frequency with proposed strategy, and the adjustable time of displacement can also be reduced by 51.7%.

Publication metadata

Author(s): Yu Q, Cao X, Deng X, Deng Z, Wang M

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Energy Conversion

Year: 2026

Pages: epub ahead of print

Online publication date: 19/03/2026

Acceptance date: 02/04/2025

ISSN (print): 0885-8969

ISSN (electronic): 1558-0059

Publisher: Institute of Electrical and Electronics Engineers Inc.

URL: https://doi.org/10.1109/TEC.2026.3675728

DOI: 10.1109/TEC.2026.3675728

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