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# Re: saturable reactor

- To: femm mailing list <femm@yahoogroups.com>
- Subject: Re: saturable reactor
- From: David Meeker <dmeeker@ieee.org>
- Date: Wed, 21 Aug 2002 10:01:37 -0400
- User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.0.0) Gecko/20020530

`Vichman Ephim <vichman@n...> wrote:`

>     Hello femm group,
>     I need the calculation of saturable reactor as AC variable
>     inductor.Can you help me?

> `E-mail : vichman@n...`
> `Thanks E.Vichman.`

`
Sorry it took a few days to respond to this. You probably have to do this the "brute force" way, if you want to model what happens with substantial load currents. That is, you'd analyze a series of magnetostatic problems over a grid instantaneous values for the DC control current and the AC load current. If you assume that the control current is stiff (which might not actually be a good assumption.... In diagrams like at http://www.tpub.com/neets/book8/32m.htm the control circuit is powered by a constant voltage rather than a constant current), you'd really only be interested in the flux that links the load coil for a given load coil current, which you can get by evaluating the A.J integral over the area of the load coil and dividing the result by the instantaneous load coil current. If you make a grid of flux linkages, you can then interpolate between tabulated values to get intermediate ones. The instantaneous voltage drop over the load coil would be:
d(flux linkage)/d(load coil current) * d(load coil current)/dt + R*(load coil current)
which you could plug into some time domain simulation, etc.`
`Dave.`

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