Magnetic shielding*
Magnetic shielding is used to reduce magnetic field penetration into a protected region by introducing materials with high magnetic permeability or by modifying magnetic flux paths around sensitive components.
Magnetic shielding is applied in transformer design, magnetic sensor protection, measurement equipment, electric machines, and electronic assemblies operating near strong magnetic field sources. The effectiveness of magnetic shielding depends on material permeability, shield geometry, thickness, and distance between the source and the protected region.
Magnetic shielding problems are usually analysed to estimate magnetic flux redistribution and field attenuation inside shielded regions. In QuickField, magnetic shielding is typically evaluated using DC Magnetics or AC Magnetics packages depending on excitation conditions.
References
Wikipedia: Magnetic shielding
QuickField examples
Superconducting bowl shield,
Superconducting ring shielding,
Iron sphere magnetic shielding