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# continuum model of proximity losses (was Re: various induction machine questions)

- To: femm@yahoogroups.com
- Subject: continuum model of proximity losses (was Re: various induction machine questions)
- From: David Meeker <dmeeker@ieee.org>
- Date: Tue, 15 Oct 2002 02:01:28 -0400
- References: <sda68527.050@eskom.co.za> <3DA8F38A.6070008@ieee.org>
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David Meeker wrote:

> There also might be a way to infer proximity effect losses a posteriori from a field solution with nonconductive bulk coil model. It seems like I saw a paper about this in Transactions on Magnetics not that long ago, but I wasn't able to fish up the reference to it tonight--I suppose that I could be mistaken.

Ok--here's the reference that I was thinking of the other day:
Proximity losses computation with a 2D complex permeability modelling
Moreau, O.; Popiel, L.; Pages, J.L.
Magnetics, IEEE Transactions on , Volume: 34 Issue: 5 Part: 1 , Sept. 1998
Page(s): 3616 –3619
The idea of a continuum model of proximity losses seems pretty cool. I cooked up an example to check it out. For the example that I tried, the much simpler bulk coil model appears to predict essentially identical losses to a model in which each wire was explicitly modeled. If you are curious about this example, I've put it up at: http://femm.berlios.de/proxapprox.zip
I put this example together pretty quickly, so hopefully it's not entirely unintelligible....
Dave.

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