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From: John Woodgate
Subject: Re: HELP choke inductor design ( power rating vs conductor gauge)
Date: Wed, 27 Nov 2002 18:03:48 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Wed, 27 Nov 2002 22:24:09 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that nanotech1
wrote (in <3DE4B70A.7AEA@sympatico.ca>) about
'HELP choke inductor design ( power rating vs conductor gauge)', on Wed,
27 Nov 2002:
>i am interested in chokes, coils or inductors design because i want to
>build my own coils i have search the net and some radio electornics
>books a lot for finding a math formula for (max load power in AC watts
>to wire gauge awg conductor size)and or( max AC amps load current to
>wire gauge awg conductor size) but not much sucess,i am looking for low
>to high ac load signal from AF to RF freq not much in dc. In ac power
>transformer there are specific current load versus cross section wire
>conductor area but generaly at 60HZ not in the rf range i guess that
>frequency has an effect on the conductor heating of a winding can the Q
>ratio be a factor in load current
You are not getting answers because you are asking too big a question
all at once. You might also attract people to put effort into helping
you if you put some effort into posting proper text, not huge long
disjointed sentences with no capital letters.
The basics are the same from 60 Hz and below right up to 300 MHz or so,
but the way they are applied differs, because different effects become
important at different frequencies.
What you know about current and wire gauges at 60 Hz works up to around
50 kHz unless you are using very thick wire, when skin effect will come
into play to increase the apparent wire resistance. You can do a Google
search for 'skin effect'. Above about 60 Hz, the physical construction
of the winding becomes increasingly important, because it affects the
self-capacitance of the winding.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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