Study on axial unbalance mechanism of radial passive magnetic bearings and its effects

Issue title: Selected Papers from the 14th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2009), Part I

Article type: Research Article

Authors: Xiu, Shichao^{a; *} | Tan, Qingchang^b

Affiliations: [a] School of Mechanical Engineering and Automation, Northeastern University, China | [b] College of Mechanical Engineering, Jilin University, China

Correspondence: [*] Corresponding author. Tel.: +86 02483679346; Fax: +86 02483679346; E-mail: 163xsc@163.com

Abstract: According to the static magnetics viewpoint, the no-friction passive magnetic bearings are not stable in their non-load direction. So its position must be limited by certain means for its applications in engineering. Based on the theory of equivalent magnetic charges, the mathematical models for the axial displacement and force of radial passive magnetic bearings were established without any hypothesis and simplifications. In addition, the numerical simulations and the experiments for the axial and radial forces of radial passive magnetic bearing were performed. It shows that the simulations results tally with the experimental results primarily, and the relative axial displacement between the inner ring and the outer ring of the magnetic bearing not only weakens the radial bearing load capacity regularly, but also induces the axial force and makes the bearings unbalance in axial direction. The researches provide an effective approach to study the performance, the load capacity and the structure of the no-friction passive magnetic bearings.

Keywords: No-friction, passive magnetic bearings, unbalance, model and simulation

DOI: 10.3233/JAE-2010-1098

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 1-2, pp. 71-77, 2010