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From: "mook johnson"
Subject: Re: transformer design 24Vac0 to 16Vac 5 ~ 30 VA etc
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Sat, 14 Dec 2002 13:33:52 GMT
NNTP-Posting-Date: Sat, 14 Dec 2002 07:33:52 CST
Organization: Road Runner - Texas
unless you are custom winding one for yourself, custom transformer design
(or anything else) is expensive.
Typically Faradays law applies when designing transformers. This will
determine the number of turns required to support the primary voltage at its
worst case maxim without saturating the core. Number of turns is a function
of, core cross sectional area, frequency, peak voltage and desired peak flux
density in the core. You also have to consider the loss factor of the core
material if you design for high flux density to get the core size down.
This will determine how much heat is generated by the core. Wire size is
chosen according to the maximum current in the core. typically a number of
500 circular mills/amp is used to size the conductors on both the primary
I good website is www.mag-inc.com Take a look at their notes on SMPS
transformer design. The equations are all the same for 60 cycle AC. (use
the sine wave equations)
"Joseph Goldburg" wrote in message
> Hi all,
> I am looking for pointers on the WEB were to find info
> on designing and making these transformers.
> I am a hardware engineer but my transformer theory is
> about 10~15 years old (lost in the grey matter)..
> How would you select suitable cores and formers, coil dial, wire lengths
> and turns etc.
> Any WEB pointers or recommended books would be appreciated.
> Example of Spec's
> Input 24V ac
> Output multi-tapped sencondary 12Vac 500mW 9Vac 6Watt
> Output multi-tapped secondary 16Vac 500mW, 5Vac 4Watt, 3Vac 2Watt
> Small cores but low cost
> Thanks in advance
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