Re: [FEMM] Solenoid charge

[David Meeker <dmeeker@xxxxxxxx>]

yanze wuan wrote:

> Many thanks for reply; the explanation was very exhaustive  indeed!
> One questions more, I wonder if, using non linear materials, there are 
> some tricks to evaluate (approximate solution, linearization  ...) to 
> solve the time varying non linear problems and which are the 
> parameters ( eddy currents, losses...) we can get with a certain 
> reliability.
>
> Any suggestion would be very appreciated, Thanks again for any 
> contribution Bye Wang

If you are really interested in nonlinear material properties, it may be 
that the only solution is to do some sort of time-stepping solution that 
includes a fairly elaborate model of hysteresis.  FEMM doesn't do this 
sort of solution (yet, at least).  The nonlinear eddy current problems 
that FEMM addesses are those in which the material is traversing a major 
hysteresis loop (i.e. no DC offset to the field), and only the response 
at the fundamental of the excitation is considered.

Dave.