Re: [TCML] VA formula

["Dan Casaregola" <ag2z@xxxxxxxxxxx>]

Hi Bert,
The mmot came from an oven which my friend brought me which used to belong 
to hid dad.  He lifted it up from a hand-cart and placed it on my workbench. 
When I opened it up, I couldn't even lift out the transformer.  Thank you 
much for the response and formula.  Dan
----- Original Message ----- 
From: "Bert Hickman" <bert.hickman@xxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, December 01, 2010 5:56 PM
Subject: Re: [TCML] VA formula


> Hi Dan,
>
> Very nice catch! Following are some useful formulas for laminated core 
> transformers, taken from the book by Eric Lowdon, "Practical Transformer 
> Design Handbook":
>
> Let f = operating frequency (Hertz)
>     A = Core area (center leg if 3 legged core, in square inches)
>
> Est Volts/turn  = V = 15.77*f*A*13000/(10^8)
> Est turns/volt  = 1/V
> Est VA capacity = (A*(f/9.6))^2
>
> Good luck,
>
> Bert
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>
> Dan Casaregola wrote:
> > I have a MMot,(read Monster Microwave Transformer) which I want to
> > estimate the VA rating of, and I lost my notes re volt-ampere
> > calculation using the core area squared.  This beast weighs 25
> > pounds, and is very well constructed.  No welds, all 1/4 20 hardware,
> > and 1/8 inch steel mounting brackets.  Ideal for re-winding for heavy
> > duty inductor or high current low voltage supply.  Would appreciate
> > the formula.  Thank you. Dan
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>
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