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Old 10th April 2012, 07:55 AM   #1
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Default Finite Element Method Magnetics (FEMM)

Hi,

Has anybody used FEMM for analyzing magnetic radiation and induction of PCB traces? (see: Finite Element Method Magnetics: HomePage)

Cheers,
E.
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Old 10th April 2012, 08:25 AM   #2
godfrey is online now godfrey  South Africa
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I've played with it. It's a nice program but I don't think it can do what you suggest here. The problem is it can't do three dimensional layouts. You're limited to 2D layouts which are either infinitely deep, or rotated about an axis.

It's ideal for loudspeaker magnetic circuit design though, either long ribbons or traditional moving coil. Although not hinted at in the name, it can also model electrostatics, so may be useful for ESL analysis / design.
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Old 10th April 2012, 08:42 AM   #3
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Hi Godfrey,

>but I don't think it can do what you suggest here
I was afraid of that already. Thanks for commenting.
BTW, do you know of another tool (preferable shareware) that can do the job?

Cheers,
E.

edit:
>It's a nice program
Indeed. I've used it once for modeling an e-bike hub motor.
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Last edited by Edmond Stuart; 10th April 2012 at 08:47 AM.
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Old 10th April 2012, 09:04 AM   #4
godfrey is online now godfrey  South Africa
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No, but then again I haven't looked.

IMHO, it should be possible and not too computationally intensive if one allows the simplification of only requiring a 2D layout which is arbitrarily shallow (rather than infinitely deep, as with FEMM). Full 3D modeling would likely be a CPU killer. OTOH, sometimes it's worth waiting half an hour for the results.

I wonder if there isn't suitable software used in other fields e.g. antenna design / modeling.
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Old 10th April 2012, 09:10 AM   #5
RJM1 is offline RJM1  United States
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Sonnet Lite, It's free and might do what you want.
Sonnet Lite
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Old 10th April 2012, 09:21 AM   #6
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Hi RJM1,

Thanks! I'll have a look at it.
But what about this limitation: 'to analyze their predominantly planar high-frequency designs from 1 MHz through several THz'
Seems not suitable for audio frequencies

Cheers,
E.
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Old 10th April 2012, 09:36 AM   #7
RJM1 is offline RJM1  United States
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That's what the " might " in my response was about.I used the full version and Microwave Office In my last job for microwave PC board design.As I remember you could set the frequency start and stop points from 0 Hz to 1Thz.
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Old 12th April 2012, 12:19 PM   #8
marce is offline marce  United Kingdom
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Would you use the info for EMC and signal integrity?
A lot of the top packages have addons that do this sort of thing or programs such as COSMOSworks. The simulations can take some time, and generaly only get used for very speed interfaces or GHz RF design, and even then not always, people still like to risk it using rules of thumb.
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Old 14th April 2012, 05:51 PM   #9
Jakob2 is offline Jakob2  Germany
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Elmer might be the right tool box:

Elmer — CSC
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Old 16th April 2012, 06:19 AM   #10
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Thanks a lot Jakob. I will have a look at it.

Cheers,
E.
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