Study on applying the linear Halbach array to eddy current brake system

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

Article type: Research Article

Authors: Wang, Jiang-Bo^{a; *} | LI, Yao-Hua^a | Yan, Lu-Guang^a

Affiliations: [a] Institute of Electrical Engineering, Chinese Academy of Sciences, 100190 Beijing, China

Correspondence: [*] Corresponding author. Tel.: +86 10 82547073; E-mail: [email protected]

Abstract: Eddy current braking systems are used in order to avoid the limit of mechanical brake. The eddy current braking system with dc-excited magnet needs the power supply and has the consequent power losses. The braking system using permanent magnets can obtain high efficiency due to no power losses. The magnetic flux density of permanent magnet Halbach array is stronger than that of conventional permanent magnet array. Further more Halbach array is of one-sided flux structure and has self-shielding property, magnetic field of one side is enhanced and the other side is weakened. Hence applying linear Halbach array to eddy current brake system is studied. Analytical method is used to analyze the electromagnetic mechanism in eddy current brake and the braking force equation is deduced. An experimental system is designed, the braking force equation is verified with the experimental result, and the result of experiment is analyzed.

Keywords: Linear Halbach array, eddy current brake, braking force

DOI: 10.3233/JAE-2010-1103

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 1-2, pp. 111-118, 2010