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 FasterCap and FastCap2
 converthenry and -e option
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brodym

USA
19 Posts

Posted - May 26 2018 :  03:51:30  Show Profile  Reply with Quote
When using converthenry, I am a bit confused how to use the -e option. In another thread I found the following by Enrico:

The -e parameter controls the outer (edge) panels ratio w.r.t. the internal panels, and helps achieving a slightly non-uniform discretization near the edges, where the fringing field effects are more pronounced, and therefore the charge density changes most on the plate.

What geometry is actually being affected by the -e parameter? Is this the thickness of the edge panel? How should we set this parameter?

Thanks

Brody Mahoney

Enrico

399 Posts

Posted - May 28 2018 :  15:13:50  Show Profile  Reply with Quote
Actually converthenry is definitely less advanced than other options you have for modelling 3D geometries for FastCap / FasterCap. I would suggest using FreeCAD and the relevant scripts of the E.M. Workbench.

Said that, the -e option is the same that you can use in the other utlities, as 'cubegen', that you can find also described in the original FastCap User's guide. In a nutshell, in FastCap you need a certain surface discretization to reduce the charge densities error. The finer the discretization, the more precise the result. However, instead of using a uniform very fine discretization, you may try using a non-uniform surface discretizaiton, that allows smaller panels near the edges, as it is well known from electrostatics that the charge tends to crowd at sharp edges and corners. So the -e parameter defines the ratio of the side panels dimensions vs. the inner panels dimensions. You can leave the default 0.1, this is usually good.

Best Regards,
Enrico

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Gleason

USA
1 Posts

Posted - Nov 23 2018 :  15:53:04  Show Profile  Reply with Quote
How difficult is to start using FreeCAD without prior experience in it though?
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Enrico

399 Posts

Posted - Dec 01 2018 :  18:17:46  Show Profile  Reply with Quote
FreeCAD is a powerful 3D CAD. It requires some learning, but there are plenty of tutorials to get you started. Also, in the case of electromagnetic simulation, you probably won't need models as complex as mechanical designs with hundreds of parts.

Said that, the macro for FasterCap at present require you to have some working knowledge of Python as well. This will change in the future, once the E.M. workbench will be integrated with a GUI supporting also FasterCap.

If you have any short-term requirement, we are fully available to assist you with modeling and simulations as a service; or for improving the E.M. workbench; not only speeding up the development, but also customizing it to your needs, should you decide instead to provide sponsorship for this open source project.

Best Regards,
Enrico
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