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# Re: [femm] Re: inductance - parallel strips

- To: femm@yahoogroups.com
- Subject: Re: [femm] Re: inductance - parallel strips
- From: dcm3c@aol.com
- Date: Mon, 19 Nov 2001 09:40:27 EST

In a message dated 11/18/01 3:01:05 AM Eastern Standard Time, sxy28@hotmail.com writes:

> To Dear Tomislav:
> How are you? Did you get inductance, L(femm)=1.1517 e-6 H/m, with your
> FEM model? I did not. At a glance, there is no space, left of left conductor
> and right of right conductor, and top and bottom too. In other words, there
> is no room for filed to develop fully. Or, the text file attached was
> corrupted in the delivery via e-mail ?

One way to interpret the geometry in his file as a section in the middle of an infinitely long inductor. That's why the inductance formula for a long inductor works well for this case.
If you assign no explicit boundary condition, the boundary acts as if it were an interface with an infinitely permeable material. Since no boundary condition has explicitly been defined on any of the exterior boundaries, you could also interpret it as a coil encased by infinitely permeable iron. The flux returns through this iron, which is not explicitly modeled by the program--it is taken care of by the boundary condition.
Dave.
--
David Meeker
http://members.aol.com/_ht_a/dcm3c

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