Ambiente EM

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This page is a translated version of the page EM Workbench and the translation is 48% complete.
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The FreeCAD ElectroMagnetic External Workbench Icon


The ElectroMagnetic (EM) 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.

Screenshot EM window.png


EM è un ambiente esterno, che può essere installato da AddonManager.

I risolutori elettromagnetici FastHenry2 e FasterCap devono essere installati separatamente. I loro codici binari e i sorgenti sono liberamente disponibili in 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.

Strumenti di FastHenry

Questi sono gli strumenti utilizzati per interfacciarsi con FastHenry:

  • EM FHNode.svg FHNode: Crea un oggetto FastHenry Node
  • EM FHSegment.svg FHSegment: Crea un oggetto FastHenry Segment
  • EM FHPath.svg FHPath: Crea un oggetto FastHenry Path
  • EM FHPlane.svg FHPlane: Crea un oggetto FastHenry uniform conductive Plane
  • EM FHPlaneHole.svg FHPlaneHole: Crea un oggetto FastHenry uniform conductive plane Hole
  • EM FHPlaneAddRemoveNodeHole.svg FHPlaneAddRemoveNodeHole: Aggiunge o Rimuove un Node o un Hole da/a un piano conduttivo
  • EM FHEquiv.svg FHEquiv: Crea un oggetto FastHenry node Equivalence
  • EM FHPort.svg FHPort: Crea un oggetto FastHenry Port
  • EM FHSolver.svg FHSolver: Crea un oggetto FastHenry Solver
  • EM FHInputFile.svg FHInputFIle: Crea un file FastHenry Input

Strumenti di FasterCap

At present, FasterCap is supported via some Macros in the 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.


Per le versioni beta di EM Workbench sono disponibili alcune esercitazioni video :

External workbenches

FreeCAD workbenches are easy to program in Python, there are therefore many people developing additional workbenches outside of the FreeCAD main developers.

The external workbenches page has some information and tutorials on some of them, and the FreeCAD Addons project aims at gathering them and making them easily installable from within FreeCAD.

New workbenches are in development, stay tuned!