Re: [femm] Permanent Magnets & Frequency.

[dcm3c@xxxxxxx]

In a message dated 9/11/01 5:07:12 PM Eastern Daylight Time, 
stan@xxxxxxxxxxxxxxxxxxxxxxxx writes:


> Help:-
> When defining a Problem Definition/Frequency of, say 100Hz, then 
> permanent magnets in the magnetic circuit are switched at the same 
> frequency.  Is there any work-around for this?
>
> Regards Stan


Well, the magnetization in the PMs shouldn't (doesn't, which I checked to 
make sure) vary at the problem's frequency for harmonic problems.  For AC 
problems, the solver treats magnets as just plain blocks of material with the 
same permeability and conductivity as the permanent magnet, but no 
magnetization.  The reason for this is that if linearity is a good assumption 
(and it must be, for the harmonic problems in the present formulation to be 
valid), a problem with things happening at different frequencies can be 
broken down into a number of single-frequency problems and the results from 
all the analyses simply superimposed to get the total solution.

Dave.
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