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Old 12th November 2012, 09:57 PM   #1
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Default Forced cooling of toroid transformer

Anybody got any clue about how much more power a toroid transformer can deliver when installed with a fairly good airflow across it?

Mounted on a plate, ie only circumference and top is subjected to free airflow.

The primary will still heat up deep down in the transformer but heat loss by forced convection should improve quite a lot.

I have no idea about thermal conductivity internally from prim-sec-outside.
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Last edited by rikkitikkitavi; 12th November 2012 at 10:00 PM. Reason: Adding word "transformer " to title :)
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Old 12th November 2012, 11:23 PM   #2
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Forced air cooling can be very effective, but it depends greatly on the surface area and shape and air flow. This is why heat sinks are used. I don't think forced air cooling of a toroid is very practical, and I've never heard of it.
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Old 12th November 2012, 11:28 PM   #3
glennb is offline glennb  Australia
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Quote:
Originally Posted by rikkitikkitavi View Post
Anybody got any clue about how much more power a toroid transformer can deliver when installed with a fairly good airflow across it?
Mounted on a plate, ie only circumference and top is subjected to free airflow.
The primary will still heat up deep down in the transformer but heat loss by forced convection should improve quite a lot.
I have no idea about thermal conductivity internally from prim-sec-outside.
Its a matter of how hot you are willing to let it get (eg. 50 - 60 deg.C surface temperature) and your toleration of increased losses and poorer regulation (due to increase in resistance of copper wire in windings).
For long term reliability and good regulation I would not run a toroid for more than about 75% of its rated load. You are suggesting greater than 100% ?
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