Analysis of the cross-coupling effect and magnetic force nonlinearity in the 6-pole radial hybrid magnetic bearing

Article type: Research Article

Authors: Wajnert, Dawid^a;

Affiliations: [a] Department of Electrical Engineering and Mechatronics, Opole University of Technology, Opole, PolandTel.: +48 774498016; E-mail: d.wajnert@po.opole.pl, ORCID 0000-0001-9025-4327

Correspondence: [*] E-mail: d.wajnert@po.opole.pl

Abstract: A hybrid magnetic bearing (HMB) with six poles is an effective construction of the magnetic bearing. It is energy efficient due to the presence of permanent magnets and it can be supplied from a three phase inverter. Unfortunately, the cross-coupling effect and nonlinearity of magnetic force occur in the 6-pole construction of the HMB. The purpose of this paper is to investigate the cross-coupling effect and nonlinearity of magnetic force as well as to propose two methods of reducing them. The proposed methods include division of the stator joke into three parts and exciting an additional current in one winding. Presented HMB was analysed with the 3D finite element method. The numerical model was verified by measurement.

Keywords: Hybrid magnetic bearing, electromagnetic calculations, cross-coupling effect, magnetic nonlinearity

DOI: 10.3233/JAE-180088

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 61, no. 1, pp. 43-57, 2019