[sdiy] Transformer question

[rkmoore at memphis.edu]

QUESTION:

What sort of effects would be caused by eddy currents due to a solid 
ferromagnetic core in a transformer?  Would it just be less efficient?  
Would the output have more nonlinearities?

Sorry to fish for a free magnetic fields lesson, but the EMF theory 
class that I took last semester wasn't very good.

Thanks, 
Richard

----- Original Message -----
From: jhaible at debitel.net
Date: Thursday, July 22, 2004 9:36 am
Subject: RE: [sdiy] Transformer question

> > Thanks for the info. Why does the core have to be sheets of iron
> > seperated by an insulating material, and not a solid core? 
> 
> 
> You need a ferromagnetic material to make a path of low magnetic
> impedance in order to direct the magnetic field the way you want 
> it to go (i.e. from your primary to secondary winding, without
> much stray field). 
> You want to avoid eddy currents (i.e. the ferromagnetic material
> acting like secondary windings of low electric impedance), so
> you either use a ferrite (not electrically conducting), or
> lamination (thin layers of material, that is electrically cunducting
> as well as magnetically, separated by thin layers of insulation
> to avoid the material forming closed loops above a certain size
> for the electric current.)
> 
> JH.
> 
> 
> 
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