Optimal Design of Tolerance Ring in Double-Decker Catcher Bearing System

Zhu Yili*, Zhang Yongchun
Department of electrical engineering, Changzhou Institute of Technology, Changzhou, Jiangsu, 213002, P.R. China.

© 2015 Yili and Yongchun

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: ( This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


In an active magnetic bearing (AMB) system, the catcher bearings (CBs) are essential to protect the system in cases of AMB failure. On the basis of the former researches of double-decker catcher bearings (DDCBs), a tolerance ring is proposed to further improve the performance of DDCB. Firstly, the support model of DDCB supported by tolerance ring is established. Then numerical simulations are carried out to determine the design parameters of tolerance ring. Finally, the tolerance ring is manufactured according to the obtained parameters and relative experiments are carried out to verify the theoretical analysis results. Both theoretical and experimental results validated that proper tolerance ring is beneficial to reduce the following impact forces and vibrations after rotor drop.

Keywords: Active magnetic bearing, catcher bearings, double-decker catcher bearing, rotor drop, tolerance ring.