[Basstler]

Hab eine nette Seite entdeckt :

http://www.ridleyengineering.com

Beschäftigt sich mit Schaltnetzteilen und hat eine Liste von allgemeinen
Mythen. Das steht dort zum Thema Stromdichte :

"Myth #5: An optimum transformer winding has a current density of 500 - 750 circular mils per amp

If you're not from the US, don't even bother calculating what a circular mil is. Current density is irrelevant. What matters is how much dissipation is in the wire, and whether there is sufficient cooling to keep its temperature in the acceptable range. Given the extreme types of cooling which may be used in power supplies,
ranging from liquid immersion at one extreme, to operation in the vacuum of space at another, the appropriate current density in the wire will vary widely.

After designing practical transformers at Ridley Engineering for more than 20 years, frankly we have no idea what the current density of any them was. The only relevant question is: how hot is it?

This myth results from an artificial constraint placed on transformer design to try and simplify and reduce the number of variables available."

Soviel zum Thema, scheint erledigt.