Wiki article · Collection 03

Finite Element Magnetics

Engineering reference on Finite Element Magnetics for wireless power system design, integration, and deployment.

6 minArticle 48/50Coil Design

Finite Element Magnetics — educational diagram — Fig.: Educational diagram for “Finite Element Magnetics”.

Finite element magnetics solves Maxwell's equations on meshed CAD to predict fields, inductances, and forces. WPT coil FEM typically uses frequency-domain eddy-current or magnetostatic-plus-postprocessing workflows depending on solver and frequency.

Accurate FEM requires honest material data — ferrite B-H curves, conductivity of aluminum spreaders, and strand-level homogenization for litz unless fully meshed.

01Workflow

Import CAD with coil, ferrite, shields, optional chassis.
Assign boundary conditions (symmetry only if truly valid).
Mesh refine in skin depth and gap regions.
Parametric gap/offset sweeps scripted for repeatability.

Finite Element Magnetics — supporting diagram — Fig.: Supporting illustration for “Finite Element Magnetics”.

02Outputs

Flux linkage for L and M, integration of B·H for core loss estimates, force maps for vibration risk. Export B-field maps at FOD sensor locations for algorithm teams.

03Validation loop

Compare first article FEM k vs bench k at 3+ positions.
Update CAD when manufacturing deviates (extra potting fillet).
Document solver version — results are not portable blindly.