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# Re: [femm] Permanent Magnets & Frequency.

- To: femm@yahoogroups.com
- Subject: Re: [femm] Permanent Magnets & Frequency.
- From: dcm3c@aol.com
- Date: Thu, 13 Sep 2001 00:54:24 EDT

In a message dated 9/11/01 5:07:12 PM Eastern Daylight Time,
stan@brerrabbit.screaming.net 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.
--
http://members.aol.com/_ht_a/dcm3c

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