The EM (ElectroMagnetic) Workbench provides the CAD front-end interface to some open source free solvers. At present it supports the 3D magnetoquasistatic impedance solver FastHenry (i.e. inductance and resistance extraction at "low" frequencies). Support for the 3D electrostatic capacitance solver FasterCap is ongoing.
The EM Workbench is an external workbench, that can be installed from the FreeCAD 
Addon Manager. This can be done via the Tools → Addon Manager menu.
The electromagnetic solvers FastHenry2 and FasterCap must be installed separately. Their binary codes as well as the sources are freely available from FastFieldSolvers.
FastHenry is a software for computing the frequency-dependant self and mutual inductances and resistances of a generic tridimensional conductive structure, in the magnetoquasistatic approximation. It can also generate Spice-compatible, multiple-frequency equivalent-circuit models.
Knowledge of FastHenry is a pre-condition for the proficient usage of the ElectroMagnetic Workbench for FastHenry. We suggest you to read the original FastHenry User's manual and play a bit with the sample files that are provided with the installation.
FasterCap is a powerful three- and two-dimensional capacitance extraction program.
Knowledge of FasterCap is a pre-condition for the proficient usage of the ElectroMagnetic Workbench for FasterCap. We suggest you to read the original FasterCap help file and play a bit with the sample files that are provided with the installation.
These are tools used to interface with FastHenry:
FHNode: Creates a FastHenry Node object
FHSegment: Creates a FastHenry Segment object
FHPath: Creates a FastHenry Path object
FHPlane: Creates a FastHenry uniform conductive Plane object
FHPlaneHole: Creates a FastHenry uniform conductive plane Hole object
FHPlaneAddRemoveNodeHole: Add or Remove a Node or a Hole from/to a conductive plane
FHEquiv: Creates a FastHenry node Equivalence object
FHPort: Creates a FastHenry Port object
FHSolver: Creates a FastHenry Solver object
FHInputFIle: Creates a FastHenry Input File
At present, FasterCap is supported via some Macros in the Export_mesh.py file available in the ElectroMagnetic Workbench GitHub source code.
The EM tools can be used in macros and from the Python console by using the EM API.
Some video tutorials are available for the EM Workbench beta versions:
- FreeCAD ElectroMagnetic Workbench tutorial - Getting started
- FreeCAD ElectroMagnetic WorkBench tutorial: create a conductive plane, part 1
- FreeCAD ElectroMagnetic WorkBench tutorial: create a conductive plane, part 2
- FreeCAD ElectroMagnetic WorkBench tutorial: create a conductive plane, part 3
- FreeCAD ElectroMagnetic WorkBench tutorial: using the path object, part 1
- FreeCAD ElectroMagnetic WorkBench tutorial: using the path object, part 2
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