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# Re: [femm] Worked example needed

- To: femm@yahoogroups.com
- Subject: Re: [femm] Worked example needed
- From: dcm3c@aol.com
- Date: Thu, 6 Sep 2001 00:41:39 EDT

In a message dated 9/4/01 11:03:57 PM Eastern Daylight Time,
jim.bloor@smiths-aerospace.com writes:

> I have two problems. Can anybody supply a worked example of a simple
> multilayer coil wound on a steel core. I would like to work out the
> inductance. I have modelled the coil and calculated the inductance
> using the E and I values but I get an answer which is 1 million times
> too small. I am obviously doing something silly here. Since this is
> a basic problem I'm sure somebody can put me right.

I've put an example problem for computing inductance at:
http://members.aol.com/_ht_a/gmagnetics/Inductance-Example/Inductance-Example.
htm
Another nice inductance example is on Jim's website at:
http://web2.iadfw.net/jd4usa/guncoil5.htm

> The second problem is how to get axisymmetric models to calculate.
> No matter how I draw the model, I get an error message when I press
> the calculate button. Once again I am sure this is s trivial problem
> but there is no information in the manual to help.

Make sure that you don't have anything drawn at a radius of less than
zero--otherwise, you will get a cryptic error message about not being able to
solve the problem. I should change this message to be more informative....
As an example of an axisymmetric problem, check out Example 2 at
http://members.aol.com/_ht_a/gmagnetics/tutor/tutor.htm

> Anyway - Femm is brilliant and I look forward to learning how to use
> it more effectively.
> Regards
> Jim Bloor

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