Simulations of remanence and field distributions of permanent magnet array with rectangular cavity

TitleSimulations of remanence and field distributions of permanent magnet array with rectangular cavity
Publication TypeJournal Article
Year of Publication2008
AuthorsXu XN, Lu DW, Xu XB, Zang WC, Madireddi S
Journal TitleJournal of Applied Physics
Volume104
Pages043919
Date PublishedAug
Type of ArticleArticle
ISBN Number0021-8979
Accession NumberISI:000259265100068
Keywordsdesign, REFRIGERATION SYSTEMS
Abstract

The magnetic phenomena of a Halbach-type permanent magnet array under a strong self-field such as demagnetization, saturation, deflection, and rotation of remanence vectors occur deep in the interior of the magnets, and thus lead to an inhomogeneous field even for a hollow cylindrical permanent magnet array with circular cavity. Considering the anisotropic magnetization loops of commercially available permanent magnets, the self-consistent remanence and field distributions of a 16 piece hollow cylindrical permanent magnet array with rectangular cavity (HCPMARC) are presented here to simulate the magnetic phenomena inside the magnets. The field distribution of a HCPMARC can be modulated by array structure while keeping both the cross sectional areas of the cavity and the magnets constant. At the expense of field uniformity, a HCPMARC acquires greater center field uniformity than a HCPMACC does. Furthermore, we simulated the magnetization and field distributions for a yoked HCPMARC obtained by replacing the partial permanent magnets with soft ones on both magnetic poles of a yokeless HCPMARC. Such substitution always enhances field uniformity but depresses the center field. This, in turn, causes changes in the average magnitude of the field in the entire rectagular cavity. (C) 2008 American Institute of Physics.

DOI10.1063/1.2970118
Alternate JournalJ. Appl. Phys.