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Magnetics software for optimizing coil design? Answered

Dear Instructables,

I need to design coils for a matress that would emit a uniform magnetic field. Does anyone know of a free software program that plots magnetic field strength of a coil?

Many thanks!
Mike

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Jack A Lopez (author)2012-06-25

I have read about something called Poisson Superfish. I think it is free with registration, but I have not tried it.  It doesn't exactly look easy to use,  but um... here's the link:
http://laacg1.lanl.gov/laacg/services/download_sf.phtml

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steveastrouk (author)2012-06-24

Well there's Maxwell SV, but that's only 2D simulation, and I'm not even sure its still available.

Finite element analysis code COSTS, there are some OSS things like
http://www.femm.info/wiki/HomePage
...which might work.

But FEA is GIGO software - Garbage In, Garbage Out - and you have to really know how to "fly" it to get reliable data out.

How "uniform" is "uniform" ? What flux density do you want ?

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Cburg1 (author)steveastrouk2012-06-24

Hi Steve!
Thanks; yes; I don't really want to have to learn a whole modeling environment. I just want a program with a pre-programmed module that has inputs for dimensions, wire size, number of turns, etc; then will show the field strength around the coil at a DC current level. It seems like someone would have done this by now?
Thanks!
Mike

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steveastrouk (author)Cburg12012-06-24

Its not a simple bit of maths to do ! It HAS to be done (accurately) with FEA

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Cburg1 (author)Cburg12012-06-24

Ohh, I need around 100 gauss at the surface of the matress. (coil imbedded ~.5 to .75").

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