Optimal design of magnetic scale for linearizing magnetic flux density and force

Article type: Research Article

Authors: An, Kwang-Ok^{a; *} | Im, Chang-Hwan^a | Lee, Chang-Hwan^a | Jung, Hyun-Kyo^a

Affiliations: [a] School of Electrical Engineering (ENG420-040), Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, 151-742, Seoul, Korea

Correspondence: [*] Corresponding author: Tel.: +82 2 880 7262; Fax: +82 2 878 1452; E-mail: [email protected]

Abstract: The new design of magnetic scale that uses magnetic levitation force is proposed. The optimal design for linearizing magnetic flux density and force is presented. The linearity of magnetic flux density and force can be improved by implementing additional metal structure on the magnet. The scale is analyzed using axis-symmetric finite element method (FEM). Global optimization is performed using evolution strategy (ES) and then more detailed shape optimization is done using sensitivity analysis. The validity of the proposed design is verified by comparing the magnetic field quantities between conventional and proposed model.

Keywords: evolution strategy (ES), finite element method (FEM), magnetic scale, optimal design, sensitivity analysis

DOI: 10.3233/JAE-2003-290

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 18, no. 4, pp. 251-258, 2003