The problem is the drilling, not the bolting. By putting a drill through a
transformer, the laminations will be shorted and eddy current will be
increased.
Transformers designed to be bolted have the laminations punched and deburred
prior to being coated all over for insulation, then assembled with the
holes aligned to allow the bolt or rivet. The laminations stay insulated and
the bolt does not contribute an eddy - current path of its own.
Julian
Who got quite familiar with this designing and building valve amplifiers in
a previous life
----- Original Message -----
From: "Joe Gwinn" <joegwinn@xxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Thursday, October 16, 2003 2:41 AM
Subject: Re: [OM] Noisy T32 (wax potting)
> At 7:04 AM +0000 10/15/03, olympus-digest wrote:
> >Date: Tue, 14 Oct 2003 15:41:05 -0500
> >From: clintonr@xxxxxxxxxxxxxxxx
> >Subject: Re: [OM] Noisy T32
> >
> Moose's report that in power transformers it's often the laminations, not
the winding, that makes the noise is correct. Bolting the laminations
together is a standard practice, and will not cause a problem because the
laminations are individually insulated. In fact, many transformers are
riveted together.
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