Analysis of eddy current field for new type of thrust bearings based on single-objective genetic algorithm

Abstract

Based on the working condition of the magnetic thrust bearing (MTB), the single-objective optimization model (SOOM) is built. The optimum design of structure parameters for two types of magnetic bearings including traditional carbon bearing and soft magnetic composite (SMCs) bearing has been carried out using genetic algorithm. The analysis of eddy current field for two types of bearings are obtained by FEM. It is found that the maximum eddy current field of SMCs bearing is less than that of carbon steel one, and the air gap magnetic density is larger than that of carbon steel bearing at the same frequency. SMCs obtained by the compression of insulated soft magnetic powders have low eddy current. Thus, under the same magnetic force conditions, the input current of SMCs bearings is lower than that of carbon steel ones. The analysis shows that SMCs can replace carbon steel and has superiority in bearing application.

Keywords

Magnetic thrust bearing soft magnetic composites single-objective optimization model eddy current field

Get full access to this article

View all access options for this article.

References

Yang

X.D.

H.Z.

Qian

Y.J.

, Elliptic motions and control of rotors suspending in active magnetic bearings, Journal of Computational and Nonlinear Dynamics11(5) (2016), 054503.

Tian

Sun

Y.H.

Yang

L.H.

, Experimental studies on support systems of high-speed motors with flexible squirrel-cage support and squeeze film dampers, Proceedings of the CSEE32(27) (2012), 79–86.

Sun

Y.H.

and Yu

, Eddy current loss analysis in radial magnetic bearings with solid rotor, Proceedings of the CSEE22(2) (2002), 116–120.

Sun

Y.S.

and Yu

, Dynamic stiffnesses of active magnetic thrust bearing including eddy-current effects, IEEE Trans. Magn.45 (2009), 139–149.

Zhu

and Knospe

C.R.

, Modeling of non-laminated electromagnetic suspension systems, IEEE/ASME Trans. Mechatronics15 (2010), 59–69.

Tian

Y.S.

Sun

Y.H.

and Yu

, Calculation of eddy current loss for magnetic thrust bearings, Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology225(8) (2011), 798–805.

Yun

Sun

J.J.

and Han

B.C.

, Modeling and design of 3-DOF magnetic bearing for high-speed motor including eddy-current effects and leakage effects, IEEE Trans. Industrial Electronics63(6) (2016), 3656–3665.

Fleischer

and Hofmann

, Application of soft magnetic composites in active magnetic bearings, in: IECON Proceedings (Industrial Electronics Conference), 2011, pp. 1770–1775.

Xiao

Ding

Sun

Yang

and Yu

, Influence of the component size ratio on densification and magnetic property of soft magnetic composites, in: International Symposium on Applied Electromagnetics & Mechanics 39(1) (2012), 547–553.