Re: Current Limiting and Impedence

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerald  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Steve,

Could you elaborate a little more on the lack of an air gap.  It seems to 
me that once you set the volts per turn and the cross sectional area of the 
core, that deterimines the margin from saturation.  If one then eliminates 
the air gap, all that changes is the inductance goes up and the ballast 
current  goes down.  Im thinking the reason for an air gap has to do with 
the effective BH curve and the resulting core losses.  Would this be correct??

Gerry R

> Original poster: Steve Conner <steve@xxxxxxxxxxxx>
>
> Ballast inductors without air gaps are no good whatever the core material. 
> The one exception being iron powder which has a "distributed air gap". So 
> you will see iron powder toroids used as filter chokes in DC power 
> supplies and the like.