Iron sphere AC magnetic field shielding
QuickField simulation example
This is an example of the iron sphere shielding simulation performed with the QuickField software. Example is prepared by Professor James R. Claycomb as a part of the webinar QuickField for Electromagnetic Shielding Applications.
Problem Type axisymmetric problem of AC magnetics.
Geometry
Given
Relative magnetic permeability of steel μ = 100,
Conductivity of steel σ = 1 MS/m,
External field B = 2.0 T, frequency f = 50 Hz... 100 kHz.
Problem:
Determine the shielding factor at different frequencies.
Solution
LabelMover parametric tool is used to automate frequency sweep. LabelMover generates a set of QuickField problems (multiplying frequency by 2 at each step), simulates problems, calculates the magnetic flux density in the point of interest and place the results in the table.
Results
Magnetic field strength distribution at 50 Hz.
| Frequency | Magnetic flux density inside the spherical shield |
|---|---|
| 50 Hz | 267 mT (13%) |
| 800 Hz | 24 mT (1.2%) |
| 6.4 kHz | 3.3 mT (0.17%) |
| 102.4 kHz | 0.13 mT (0.007%) |
- Video: Iron sphere AC magnetic field shielding
See more in QuickField for Electromagnetic Shielding Applications webinar. - View simulation report in PDF
- Download simulation files (files may be viewed using any QuickField Edition).