Re: [TCML] nst

["Jon Danniken" <danniken@xxxxxxxxxxx>]

It is true that the laminations are used to prevent losses (heat) from eddy 
currents.  However, I would assume that a localized connection of the 
laminations, as might occur from drilling/milling the laminations, would 
only cause a localized loss where the laminations touched, and wouldn't be a 
significant source of loss as you would get if all surfaces were touching 
(as would be the case if the laminations were not dipped in whatever they 
dip them in to electrically isolate them from each other).

That is my assumption, anyway.  I am assuming this for several reasons, one 
of which is the fact that microwave oven transformers have the laminations 
welded together, which definitely shorts out the laminations in the weld 
area.

This is something that I have always wanted to try, removing (by drilling, I 
don't have a mill yet) some material from the shunts in a transformer in 
which the shunts are extensions of each lamination sheet.  If you have or 
can obtain an extra NST, you might consider trying this by removing some 
material from the integral shunts in stages, recording your observations of 
short-circuit current generated at each stage, in order to quantify the 
effect.

Jon

----- Original Message ----- 
From: "douglas smith"

I've been informed that i cant simply use my mill and carefully drill out 
material
where the shunts should be. i had always thought that the lamination's were 
simply
a part of the fabrication process.
having worked with sheet metal its easier to make a big piece out of 
multiple smaller pieces than to have to machine solid pieces. That was my 
thinking anyway.
i didn't realize that drilling through them would essentially short out the 
laminates,
but i guess it does make sense.

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