Re: The "second pig" ballast: Questions.

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Ed Phillips <evp@xxxxxxxxxxx>

"This I believe.  For a given number of turns N on a gapless toroid, it
will
have an inductance L and(with an applied AC voltage of fixed magnitude
and
freq) a maximum current I.  If the Imax is too small then the addition
of
the airgap will reduce the L and allow the current to increase."

	With the gapless core the inductance will depend on where the core flux
"excurds" along the B-H curve and will be pretty hard to predict.

"I have heard that the addition of the airgap will keep the core from
saturating and this is the point that I'm not seeing (if it is true)
Seems
like the flux density in the core is a function of the cross sectional
area. the volts per turn and frequency, and not dependent on the
presence
of an airgap.  Would this be correct??"

	Absolutely correct!

Ed