Please clarify power calculation

johnr66 · 15th September 2011, 01:31 AM

As I understand, it is possible to get a rough estimation of an EI core transformer's power (VA) by finding the area in cm of the center leg (the part under the winding, not the full height). Square that figure to get the rough power. I'm not clear on what dimensions to use. Using the diagram, what do I use? A*B, C*B, or ??
Thanks

SoNic_real_one · 15th September 2011, 01:39 AM

A x C

! · 15th September 2011, 03:49 AM

I'm no expert on transformer design but I vaguely recall there are certain dimensional ratios that lend themselves to lower manufacturer production costs when stamping out the metal. You'd have to determine if it has that dimensional ratio before you could assume that multiplying only two dimensions would be appropriate as a change in the 3rd (whichever dimension remains uncalculated) would potentially affect the power rating.

RJM1 · 05:45 AM

A good article on transformers and transformer winding including an Excel
calculator for core and copper losses.
Practical Transformer Winding

Another to answer your first question about power for core size.
http://www.ludens.cl/Electron/Magnet.html

15th September 2011, 01:31 AM	#1
johnr66 diyAudio Member Join Date: Mar 2009	Please clarify power calculation As I understand, it is possible to get a rough estimation of an EI core transformer's power (VA) by finding the area in cm of the center leg (the part under the winding, not the full height). Square that figure to get the rough power. I'm not clear on what dimensions to use. Using the diagram, what do I use? AB, CB, or ?? Thanks

15th September 2011, 05:39 AM	#4
RJM1 diyAudio Member Join Date: Jan 2010 Location: Titusville, Fl.	A good article on transformers and transformer winding including an Excel calculator for core and copper losses. Practical Transformer Winding Another to answer your first question about power for core size. http://www.ludens.cl/Electron/Magnet.html Last edited by RJM1; 15th September 2011 at 05:45 AM.

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15th September 2011, 01:39 AM	#2
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	A x C

15th September 2011, 03:49 AM	#3
! diyAudio Member Join Date: Jun 2005 Location: Midwest	I'm no expert on transformer design but I vaguely recall there are certain dimensional ratios that lend themselves to lower manufacturer production costs when stamping out the metal. You'd have to determine if it has that dimensional ratio before you could assume that multiplying only two dimensions would be appropriate as a change in the 3rd (whichever dimension remains uncalculated) would potentially affect the power rating.

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