EM Workbench

Introduction
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.

The EM Workbench is a FreeCAD addon, that can be installed on demand. It is not part of the standard FreeCAD install.



Installation
At present, the EM Workbench must be manually installed. See the instructions in the README at the EM Workbench GihHub page.

The electromagnetic solvers FastHenry2 and FasterCap must be installed separately. Their binary codes as well as the sources are freely available from FastFieldSolvers.

FastHenry
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
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.

FastHenry Tools
These are tools used to interface with FastHenry:


 * [[Image:EM_FHNode.svg|32px]] FHNode: Creates a FastHenry Node object
 * [[Image:EM_FHSegment.svg|32px]] FHSegment: Creates a FastHenry Segment object
 * [[Image:EM_FHPath.svg|32px]] FHPath: Creates a FastHenry Path object
 * [[Image:EM_FHPlane.svg|32px]] FHPlane: Creates a FastHenry uniform conductive Plane object
 * [[Image:EM_FHPlaneHole.svg|32px]] FHPlaneHole: Creates a FastHenry uniform conductive plane Hole object
 * [[Image:EM_FHPlaneAddRemoveNodeHole.svg|32px]] FHPlaneAddRemoveNodeHole: Add or Remove a Node or a Hole from/to a conductive plane
 * [[Image:EM_FHEquiv.svg|32px]] FHEquiv: Creates a FastHenry node Equivalence object
 * [[Image:EM_FHPort.svg|32px]] FHPort: Creates a FastHenry Port object
 * [[Image:EM_FHSolver.svg|32px]] FHSolver: Creates a FastHenry Solver object
 * [[Image:EM_FHInputFile.svg|32px]] FHInputFIle: Creates a FastHenry Input File

FasterCap Tools
At present, FasterCap is supported via some Macros in the Export_mesh.py file available in the ElectroMagnetic Workbench GitHub source code.

API
The EM tools can be used in macros and from the Python console by using the EM API.

Tutorials
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

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!