Analytical Method for Equivalent Magnetic Performance of Laminated Composite Shielding Device Considering 3-D Magnetic Field Components

The laminated composite shielding device consisting of nanocrystalline and permalloy (PN-LCSD) can shield the magnetic interference for sensors and measuring devices better than the conventional methods. The equivalent magnetic performance (EMP) of PN-LCSD is the primary condition for its effectiveness evaluation. However, existing calculation methods for EMP are based on unidirectional magnetic fields, ignoring the superposition influence of 3-D magnetic field components in space on PN-LCSD, which brings difficulties to the accurate evaluation of PN-LCSD’s performance. Therefore, an EMP analytical method for PN-LCSD considering 3-D magnetic field components is proposed in this article, enabling the computation of its permeability and shielding factor (SF). First, the 3-D equivalent permeability analytical method for PN-LCSD is established, and its parameter analysis and simulation verification are carried out. Subsequently, the SF calculation equations considering 3-D magnetic field components for PN-LCSD are derived. Finally, the remanence and SF in PN-LCSD are tested, showing only 4.65% and 6.83% maximum deviations between the experimental and theoretical values. The proposed method establishes a foundation for the theoretical analysis of PN-LCSD in 3-D magnetic fields.