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Electromagnetic shielding

electromagnetic shielding FEA finite element analysis, field attenuation by magnetic shielding

Uniform external magnetic field is produced by the electric magnet. The shield with the measuring coil inside is placed between its poles. EMF in the coil is measured: in case of DC current in the coil - by ballistic galvanometer (in the moment of switching on), in case of AC current - by use of voltmeter.

Geometry
The shield consists of two halves. The gap could be enlarged up to 2 mm by sheets of non-magnetic materials.
Electromagnetic shielding The shield consists of two halves. Cylindrical shield Ø63mm 5mm 31.5mm 31.5mm Gap 0.. 2mm Spherical shield The shield consists of two halves. Spherical shield Ø63mm 5mm Gap 0.. 2mm

Given
Electrical conductivity of copper 57 MS/m.
Electrical conductivity of steel 10 MS/m.
Relative magnetic permeability of steel μ=1000.
External magnetic field flux density B = 0.139 T (peak value for AC magnetic problem).

Task
Find the level of magnetic field reduction inside the shield. Shields made of steel and copper of the same geometry are analyzed.

Solution
Due to symmetry of the model the simulation domain is requced to a quater of a full model.
External magnetic field is specified by the boundary condition A=0.0695 Wb at the top boundary.

Results
Current density in cylindrical and spherical shielding:
cylindrical and spherical AC magnetic shields simulation

Shielding coefficient - relation of magnetic flux densities outside and inside the shield.

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