Science Forums 2

[Freethinker]

Originally posted by: kerplunk
I am new here and not really interested in this topic....but i did find this site posted by Janus20 in the test page forum. Maybe it could be of use to you in you theoretical quandry

Hello Kerplunk. I hope you do find a topic of interest and join our discussions. We always enjoy new voices of reason.

I didn't have time to read the whole page (quite large by the way) but it seems to be dealing with the subject that you are discussing. Hope it helps!

Nor did I ahve time to do more than a quick review.

My approach to such sites is to start doing some fact checking at the beginning. If it starts getting things wrong early, I don't need to waste too much additional time. That is how I would classify this site.

e.g. "The diagram shows an iron transformer that has an unlaminated core. Contrary to popular belief, laminations do not directly improve the efficiency of transformer windings."

Perhaps this is an "what is 'is'" discussion? At lower frequencies especially, where E/I iron cores are used, they DO noticably increase a transformer's efficiency. If you take two coils at a given orientation with and without a core, there is a dramatic difference. If the width of the E/I laminated plates is correct, the efficiency compared to a solid core goes up. In fact, this used to be a regularly found problem. When power supplies designed with 60hz E/I cores are used in 50Hz countries they would overheat because of internal power comsumption (low coefficient of coupling). Now are they using "directly" to put some fudge factor in there? WHo knows. But the statement is not correct.

Further "The truth about WHY eddy currents occur naturally, remain unquestioned and therefore unanswered."

I learned the answer to this in High School Electronics! Simple wavelength related standing waves.

and then "Applying the Conservation of Energy (First law of Thermodynamics):
VI in = VI out + Eddy Current heat to cooling oil and this simplifies to: -"

This ignores loss in the windings themselves, which is frequency dependant, energy loss thru heat transfer TO the "cooling oil" and many other factors.

And this was only a couple of the errors found to that point.

At which point I stopped wasting my time there.