Re: Saturation in transformers.



Ian Iveson wrote:

> Patrick Turner wrote
>
> > Your explanation wouldn't be easy for anyone without serious
> > knowledge
> > to follow.
>
> Why not? I followed it OK. I think.
>
> Generally there are as many ways of explaining as there are
> variables.
>
> > Fs = 22.6 x V x 10,000
> > ------------------
> > B x Np x Afe
> >
> > Where
> > Fs = frequency of saturation,
> > 22.6 is a constant for all equations,
> > V = voltage in rms across the primary,
> > Np = primary turns,
> > B = maximum allowable magnetic field strength in Tesla in the
> > core,
> > Afe = cross sectional area of the central core leg, in square
> > mm.
> >
> > The saturation is a voltage caused phenomena.
>
> No.
>
> Fundamentally, magnetic field depends on current. A voltage without
> a current will not cause a magnetic field. Saturation arises from a
> magnetic field, therefore it is directly related to current, not
> voltage.
>
> By your own formula, you should be able to see that saturation
> depends not just on voltage, but also on frequency. For an inductor,
> the upshot of voltage and frequency is current.

If you read RDH4, you'd see where they say saturation is a voltage
related phenomena,
and sure there is a magnetizing current in a tranny, whether loaded or
not,
and that current is due to voltage applied across an inductance.
but once that voltage exceeds a threshold the steel saturates, and the
coil becomesa short circuit when the steels field cannot continue to
oppose the current flow of the current from the applied voltage.
The very field in an inductor opposes the current flow...

>
>
> If you think of it as a load resistance in parallel with an
> iron-cored inductor with a given core and number of windings, it is
> the current through the inductor that produces the magnetic field,
> hence too much current leads to saturation.

The too-much-current occurs after a voltage threshold hold has been
reached.

Patrick Turner.

>
>
> This agrees perfectly with Jerry's point, that the load can be
> ignored...easily done by testing with no load.
>
> cheers, Ian

.

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