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# Re: [femm] Incorrect Field values returned by FEMM

- To: femm@yahoogroups.com
- Subject: Re: [femm] Incorrect Field values returned by FEMM
- From: David Meeker <dcm3c@earthlink.net>
- Date: Thu, 06 Dec 2001 20:30:53 -0500
- References: <9uom1u+lr1m@eGroups.com>
- User-agent: Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:0.9.4) Gecko/20011019 Netscape6/6.2

``
`cgn38nuc wrote:`

>     I am using FEMM 3.1 to analysis a lifting magnet. The results as
>     returned by the program indicate a maximum B value of 5.3 Tesla 4"
>     from the working surface of the magnet. But, the saturation of steel
>     only produces slighly more than 2 Tesla. I wasusing the B-H curve of
>     1020 Steel in my formulation. What am I missing from my analysis.

> `Thank you,
> Paul Sheridan`

`
You just have to be careful when you are analyzing highly saturated models--you are running your model in a region where the program is extrapolating linearly off the end of the defined B-H curve, leading to bad results. The cure for this situation is to define enough BH points so that the program is always interpolating between defined points, rather than extrapolating.`
`Dave.`
``

- References:
  - Incorrect Field values returned by FEMM
    - From: "cgn38nuc" <cgn38nuc@yahoo.com>

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