Magnetic field modeling of a dual-magnet configuration

作者：Teo Tat Joo^*; Chen I Ming; Yang Guilin; Lin Wei

来源：Journal of Applied Physics, 2007, 102(7): 074924.

DOI：10.1063/1.2794855

This paper presents the theoretical and experimental studies of a dual-magnet (DM) configuration that forms the electromagnetic circuit of a nanopositioning actuator. Motivation of this work arises when an accurate prediction of the magnetic field behavior within the DM configuration is required to achieve ultrahigh precision motion control. In the theoretical modeling, the DM configuration is decomposed into several regions where each region is treated as a boundary-value problem. A method, termed superposition of the boundary conditions, is used to obtain the field solution of an air gap that is influenced by two magnetic sources. Consequently, a two-dimensional (2D) analytical model that accurately predicts the magnetic field behavior of the DM configuration is presented. In the experimental investigations, the magnetic flux density measured from a DM configuration prototype is used to validate the accuracy of the 2D analytical model. These experimental data were also compared against the magnetic flux density collected from a conventional single-magnet configuration prototype. Such comparisons verify the claimed features of the DM configuration, i.e., providing 40% increase in the magnetic flux density and offering an evenly distributed magnetic field through the entire air gap of 11 mm.

• 出版日期2007-10-1
• 单位南阳理工学院