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Re: laminations, insulation



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FYI
I once rewound a transformer to get a different voltage and it ran hot for
quite a while do to eddy currents. It did, however after about a month or
two, start to run cooler. I ASSumed the laminations began to oxidize
lowering circulating currents. I also remember the laminations sticking
together and separating them left exposed spots on the xformer steel.
Dave

----------
> From: Tesla List <tesla-at-poodle.pupman-dot-com>
> To: Tesla-list-subscribers-at-poodle.pupman-dot-com
> Subject: laminations, insulation
> Date: Monday, February 10, 1997 11:25 PM
> 
> Subscriber: pierson-at-gone.enet.dec-dot-com Mon Feb 10 21:58:06 1997
> Date: Sun, 9 Feb 97 13:09:38 EST
> From: pierson-at-gone.enet.dec-dot-com
> To: mail11:; (-at-teslatech)
> Cc: pierson-at-gone.enet.dec-dot-com
> Subject: laminations, insulation
> 
> 
> >From my long ago training in 'lectrical engineering:
> 
> While, in theory, it is deirable to insulate the laminations, in
PRACTICE,
> the voltages driving the 'circulating currents'/eddy currents is small,
in
> the driection across the laminations.  In PRACTICE, the simple fact that
each
> sheet IS separate is sufficient insulation for practical purposes.
> 
> Now this ws manufacturing/design practice based on conentionalish motor
> and transformer designs.  It May Be that neon, or stray tesla (lfrf)
currents
> require explicit insulation.  But i doubt it...
> 
> 	regards
> 	dwp