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Re: Transformers with welded laminations



Original poster: "D&M's High Voltage, Inc." <dmshv.davmckin@xxxxxxxxxxx>

Cost is the main reason.  The losses added by the welds are insignificant
(especially on short duty cycle transformers).  We've even seen EI inductors
that have framing bars that "partially" short out the gaps.  They get away
with this when designing the inductor by accounting for the reduction in the
gap length caused by the shorting effect of the steel across the gap.
Saturation in the bar reduces the permeability and thus doesn't fully short
the gap.

Best regards,

David L. McKinnon
D&M's High Voltage, Inc.

Website:  www.dmshv.com
Email:  Sales@xxxxxxxxx



----- 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.
>
>
>