Modeling of Switching Ripple Currents (SRCs) for magnetic bearings including eddy current effects

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

Article type: Research Article

Authors: Tian, Yongsheng^a | Sun, Yanhua^{a; *} | Yu, Lie^a

Affiliations: [a] Institute of Mechatronics and Information Systems, Key Laboratory of Ministry of Education for Strength and Vibration, Xi'an Jiaotong University, Xi'an 710049, China

Correspondence: [*] Corresponding author. Tel.: +86 2982669160; Fax: +86 2982669160; E-mail: yongsheng0220@163.com, sunyanhua@mail.xjtu.edu.cn

Abstract: In magnetic thrust bearings (MTBs), eddy currents induced in the solid stator and thrust disk not only result in performance degrading of the bearing, but also influence the SRC of the coil when driven by a switching power amplifier. In this paper, a fractional differential equation (FDE) model of the SRC considering the effects of eddy current is proposed and a numerical solution can be obtained from it by a predictor-corrector algorithm. Results from finite element method (FEM) and experiments show its validity. The presented model can be applied to the studies of self-sensing of non-laminated magnetic bearings.

Keywords: Switching ripple current, fractional differential equation, FEM, magnetic bearing

DOI: 10.3233/JAE-2010-1187

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 1-2, pp. 791-799, 2010