Effects of non-uniform magnetization on the performance of a magnetic bearing

Article type: Research Article

Authors: Tan, Qing Chang^{a; *} | Kou, Zun Quan^a | Li, Wei^a | Pei, Yong Chen^a

Affiliations: [a] Institute of Mechanical Science and Engineering, Jilin University, Nan-ling Campus, Changchun, 130025, P.R. China

Correspondence: [*] Corresponding author: Tel.: +86 431 5705757; Fax: +86 431 5705288; E-mail: tanqc514@yahoo.com

Abstract: In the present work, the distribution of non-uniform magnetization of magnetic rings is experimentally measured and analyzed. The effects of non-uniform magnetization and the soft-magnetic material on the performance of a magnetic bearing are investigated using the theory of magnetic charges, and a model for predicting magnetic force of magnetic-thrust bearings constructed from permanent magnets is developed. The model is verified using the experimental rig built. From the model, fluctuations of the magnetic force and bearing stiffness caused by the non-uniform magnetization are calculated and analyzed.

Keywords: magnetic bearing, magnetic force, magnetization, friction, bearing stiffness

DOI: 10.3233/JAE-2004-296

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 20, no. 2, pp. 71-80, 2004