RE: Charging inductors for resonant charging

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: jimmy hynes <chunkyboy86-at-yahoo-dot-com> 

Ok, I think I get it now. The problem is that when the current is 0, there 
is still flux left in
the core. Right? How would an airgap prevent this from happening?

 > Maybe the problem isn't "flux walking" but simply that ungapped iron-cored
 > inductors don't like to store much magnetic energy. I reckon this is because
 > magnetic energy is 0.5*L*I^2, and increasing the airgap increases Imax as
 > fast as it decreases L. (The energy stored in the airgap can be felt as
 > mechanical force, on a previous version of my line choke it was enough to
 > overcome the clamp bolts and crush the airgap shut.)

The inductor will have to store all the energy in an airgap, but I was 
talking about using a
transformer to step the voltage down so you could use a low voltage 
inductor. I was saying that
the transformer shouldn't need an airgap.


=====
Jimmy

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