Re: BH data

["mikejhutch" <mhutchings@xxxxxxxxxxxxxxxxxxxxxx>]

Yes I am interested in a.c. behaviour up to 10 kHz or so. Due to the 
very high permeability of radiometal the skin depth will be very 
small. Thanks for the insights; I can proceed with more confidence 
now....I think.

Mike


--- In femm@xxxx, "David Meeker" <dcm3c@xxxx> wrote:
> This is a good question. Traditionally, people have used the 
initial
> magnetization curve as the BH curve in magnetostatic simulations. 
If
> you have this info, it is OK to use it as your BH curve for
> magnetostatic simulations.
> 
> However, it sounds like you are actually interested in AC 
simulations.
> Even though the program accepts a nonlinear BH curve, the nonlinear
> BH curve is ignored for AC simulations and the linear values of
> permeability are used instead. (strictly speaking, harmonic analyses
> are well-defined only in the case of linear materials) In this 
case, a
> good approach would be to pick a characteristic RMS value of H that
> your material would see and then pick the corresponding point on the
> BH curve corresponding to this value, calling it Brms. The
> permeability that you'd use would for your simulation would be 
Brms/Hrms.
> 
> Dave.