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Vichman Ephim <vichman@xxxx> wrote:
Hello femm group,
I need the calculation of saturable reactor as AC variable
inductor.Can you help me?
E-mail : vichman@xxxx
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.