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Old 11th May 2006, 05:56 AM   #1
Skorpio is offline Skorpio  Denmark
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Default Transformer orientation

Does anybody know in what direction the feild from a EI core transformer is spread?

Looking for the optimum placement....
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Old 11th May 2006, 07:56 AM   #2
flg is offline flg  United States
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Skorpio, I believe the "flux Lines" travel through the center and 1/2 of them circle through each outside. Picture two circles touching. The center of the core would be the touching part.
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Old 11th May 2006, 01:43 PM   #3
Skorpio is offline Skorpio  Denmark
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The center of the core is that the hole in the bubbin where the windings are turned around?
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Old 11th May 2006, 06:08 PM   #4
flg is offline flg  United States
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Yes, the center leg of the E will have twice as many flux lines as the outside legs and there will be a north south orientation at each end of the center leg. Most of the feild is in the core. However, I might expect radiation to exist along the two sides of the windings not surroundd by core. In other words, perpindicular (as seen from the top) to the core...
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Old 11th May 2006, 07:23 PM   #5
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Oh Boy, read =>
www.bryston.ca/newsletters/85_files/vol8is5.html

Often EI-transformers are mounted in a 45 degree turned position to lower the influence of the magnetic field lines.
Generally you do not wish to look in the hole, as with other parts.
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Old 12th May 2006, 01:25 AM   #6
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Default Mounting EI transformers

Dear All,

I thought this might be a reaonable topic to put these questions:

I have several oldish but fully functional 300W EI transformers.

1. They have clamps at various spots which are bolted to the EI laminations through the corners. I would like to modify/move them. The whole transformer is covered in some sort of varnish. Is it a safe job (i.e. won't damage the transformer), to remove the bolts and reposition the clamps. Will the whole thing just spring apart???

2. Is there such a thing as a "shorted turn" (as you can get with toroids) which is caused by mounting EI type transformers??

3. Can you use a couple of metal clamps at the TOP of the transformers to safely hold them down to the chassis base?

Thanks for your advice,
Regards,
George.
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