Re: [femm] Incorrect Field values returned by FEMM

[David Meeker <dcm3c@xxxxxxxxxxxxx>]

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.