A Magnetic Field Canceling System Design for Diminishing Electromagnetic Interference to Avoid Environmental Hazard

Abstract

Electromagnetic interference is a serious and increasing form of environmental pollution, creating many issues in the areas of health care and industrial manufacturing. The performance of high-precision measurement equipment used in health care and the manufacturing industry is sensitive to electromagnetic interference. However, extremely low-frequency magnetic fields (ELFMF), with a frequency range from 3 to 30 Hz, generated by high-power lines have become the main interference source in high-tech foundries. This paper presents a magnetic cancelling system that works by combining active cancelling technology and passive cancelling technology to reduce the ELFMF around high-precision measurement equipment. The simulation and experimental results show the validity and feasibility of the proposed system.

Theoretical Analysis of a Magnetic Shielding System Combining Active and Passive Modes

“…Therefore, we can combine the two methods to achieve active and passive shielding. Static and 50 Hz power-line magnetic fields belong to low-frequency magnetic fields, and high-permeability magnetic materials are usually used as shielding materials to ensure that the magnetic field lines gather inside the magnetic shielding material and do not leak into the external area, thereby achieving a significant attenuation of the magnetic field [ 6 ]. Traditional soft magnetic materials have good shielding effects.…”