Re: [TCML] transformer theory questions

[jhowson4@xxxxxxxxxxx]

In all the cores I have seen with the welds. Those welds have been on the outside of the E-core and on the opposite side of the primary. 
also I have never seen a U-core that was welded. 

I don't know enough to draw a conclusion, but maybe someone else can use this observation to help. 

Jay Howson 

----- Original Message ----- 
From: "Gary Lau" <Gary.Lau@xxxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> 
Sent: Monday, September 21, 2009 11:47:47 AM GMT -05:00 US/Canada Eastern 
Subject: RE: [TCML] transformer theory questions 

Hi David, 

I had thought about the possibility of eddy current losses, but I also recall seeing some cores having a weld tying all of the laminations together, clearly shorting the laminations. It may be that to get eddy currents, the laminations may need to be shorted in two different places? I don't recall if the welded cores I've seen had a single bead or not, and it's unclear if a hack saw hack job would also short in multiple places. But "don't do it" is surely the safest course of action! 

Regards, Gary Lau 
MA, USA 

> -----Original Message----- 
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On 
> Behalf Of David Rieben 
> Sent: Monday, September 21, 2009 11:09 AM 
> To: Tesla Coil Mailing List 
> Subject: Re: [TCML] transformer theory questions 
> 
> 
> Hi Thomas, Gary, all, 
> 
> I would also suspect some unwanted eddy current losses/heating of the core 
> to result from 
> "cutting across the laminations", too, as this would almost certainly short 
> some of the 
> laminations together, electrically. 
> 
> 
> >> What happens if you cut into the frame of a transformer, cutting the 
> >> across 
> >> the iron lamination? 
> 
> > I wouldn't do that. I expect that the consequences are largely 
> mechanical - like you won't be able to get it back together again after the 
> laminations are mangled. 
> 
> \ 
> > Many thanks 
> > 
> > Thomas 
> 
> > Regards, Gary Lau 
> > MA, USA 
> 
> David Rieben 
> 
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