18 Aug
1999
18 Aug
'99
3:31 p.m.
Hi Tony and all,
At 03:28 AM 8/19/99 +0100, you wrote:
Yes the number I gave was for 60Hz
here. The 50Hz would of course give your
number, both being approximate.
Yes, It can be confusing, there are at least 6 wire gauges I see in the CRC
Handbook. I know of AWG and SWG (for UK?). If in doubt I give the diameter
of the wire (AWG 23 = 0.57mm diameter). I usually use wire tables from
other places that the 'Rubber Bible' that include different enamel wire
sizes and types, not "bare" copper.
-Dave
Yes. Good
numbers to start with for power transformers are (US
measurements, I am sure there are equivalent ones in use elsewhere):
6 turns/volt/square inch of core.
We use 8 turns/volt on a 1 sq inch core over here, presumably because we
use 50Hz mains and so need larger transformers.
FWIW those transformer kits I mentioned give the turns/volt that the
primaries are would with, and thus what you use for the secondaries.
I looked here for an equivalent source without luck, which isn't too bad
for 1X units where I just strip and rewind the secondary of an existing
transformer.
Rewinding the primary isn't too bad (120 Volts) if also required.
For AWG 23 wire, 1 Amp and area changes by 2x for
every 3 gauge numbers.
There are, alas, many different wire gauges in use. I normally refer to
the tables in the 'Rubber Bible'[1] before doing any serious designing.