RE: Dissolve Xfmr laminations

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

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>

Hi Ed

If the core is an I sitting on an E, then one can break the I off the E with
a rubber mallet and the core is really for new windings. However some cores
have E's placed up and down with I's as spacers. The only way to remove the
windings is to pull apart all the laminations. One can see that the
laminations were stuck together with some sort of varnish ever so faintly
applied. Then all the E's can be stacked into an E and the spacers can be
stacked into an I. Now the problem is to get the laminations to stick
together to cut down the inferno buzzing of the laminations. If the dry type
power transformers in question are of this type, then the act of breaking
apart the laminations is enough to cause the thickly applied varnish to
break away---just tap a butter knife out along the edges.   

The best deal is the core of an x-ray transformer. Here the laminations are
not glued together, but pressed together by massive clamps and bolting
holes.

Godfrey Loudner      

> -----Original Message-----
> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent:	Friday, January 18, 2002 7:39 PM
> To:	tesla-at-pupman-dot-com
> Subject:	Re: Dissolve Xfmr laminations
> 
> Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <evp-at-pacbell-dot-net>
> 
> Tesla list wrote:
> > 
> > Original poster: "Loudner, Godfrey by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>
> > 
> > Hi Daniel
> > 
> > I would be concerned about stripping the coating on the laminations that
> > protects them from eddy currents. I have never had any trouble getting
> apart
> > the laminations with a butter knife once a few of them have been
> removed. Of
> > course it might be very difficult to get out the first few laminations,
> and
> > the extraction might even destroy them.
> > 
> > Godfrey Loudner
> 
> 	The oxide coating on the surface of each lamination provides the
> necessary insulation, and if the laminations are packed in as tightly as
> they should be the varnish won't penetrate the stack.  All along I have
> assumed the purpose of this discussion was just to get the laminations,
> and not try to use the existing windings.
> 
> Ed
> 
>