Mu-metal cylinder shield for the static magnetic field shielding - QuickField simulation example
This is an example of the mu-metal cylinder shielding simulation, performed with QuickField software. Example is prepared by Professor James R. Claycomb as a part of the webinar QuickField for Electromagnetic Shielding Applications.
How to find mu-metal cylindrical magnetic shielding?
Answer Typical applications Geometry
Given
Problem: Solution
Results
Magnetic field strength distribution in case of the transverse magnetic field
See more in QuickField for Electromagnetic Shielding Applications webinar.
Engineering question
Set up an axisymmetric QuickField DC Magnetics problem for a mu-metal cylindrical shield and evaluate magnetic shielding from computed field results.
mu-metal cylindrical shields, low-field magnetic shields, precision instrument shielding
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Simulation problem
Problem Type
Axisymmetric problem of DC magnetics.
Relative magnetic permeability of mu-metal μ = 10000,
External field B = 0.5 T.
Determine the shielding factor for axial and transverse field direction.
Two problems were simulated: axisymmetric (mu_metal_rz.pbm) for the axial magnetic field and plane-parallel (mu_metal_transverse.pbm) for the transverse magnetic field. Uniform external magnetic field was defined by assigning non-zero vector magnetic potential on the simulation area boundary.
Magnetic field strength distribution in case of the axial magnetic field
Magnetic flux density
inside the cylinder shield
Axial field
78 mT (16%)
Transverse field
0.56 mT (0.1%)
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