Re: Transformers with welded laminations

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>

ease of assembly and cost. The (small) eddy currents caused by the 
weld seam will cost about .1-.5 % effieciency, not much on small 
(<1kva, eg: mot) transformers that are only 80-90% efficient to begin with.

Mike
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, January 30, 2006 12:30 PM
Subject: Transformers with welded laminations


> Original poster: norman@xxxxxxxxxxxxxxxxxxxxxxxxx
> I have come across several misc high voltage transformers with a thin welded
> stripe shorting all the laminations together.  Why would the manufacturer do
> this since it will cause eddy currents? These transformers also had
> (coincidently?) magnetic shunts.