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Hans
Thanks for the info.
I have several toroid wound mains transformers and
wondered if they would be any use. A couple of persons have mentioned using this
type on VLF.
I have a number of old LOPT cores and these would be more
suitable. I use these on 137 and 500 and they work well.
73 de mal/g3kev
----- Original Message -----
Sent: Sunday, February 20, 2011 7:22
PM
Subject: Re: LF: toroid xformer
Dear Mal,
do not expect anything from laminated sheet iron
cores. Usable frequencxys depends on the thicknes of the Iron sheets, and the
conductivity ot the material. Therefore the iron is alloyed with silicon and
aluminium, to reduce edding currents. Best frequ. for Mains transformers is
200 Hz, with superior sheet iron 400 Hz. Toroid cores from vitrous glasses
would be best, but are not available, only as catalog numbers at
Vacuumschmelze Hanau or Arnold, Micrometals and other manufacturers of
materials. They do not offer kits with cores and coilformers . This problem is
widely discussed in students lessons of the type "Maxwells equations and the
transformer with laminated Iron core. "
55, Hans-Albrecht
DK 8
ND
Von: "mal hamilton" <[email protected]>
Gesendet:
20.02.2011 16:18:01
An: rsgb
<[email protected]>
Betreff: LF: toroid
xformer
LF
Has anyone measured the efficiency of
a mains toroid xformer on 9 Khz. I have some of these which could be
useful.
ie 230v Prim and 6/12/24 v Sec, rated
10A at 12v
de mal/g3kev
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