[time-nuts] Transformer design.
xformer at citynet.net
Mon Jun 27 19:08:13 UTC 2011
I have the MIT books, and they are good. I think I listed, "Magnetic
Circuits and Transformers", in the references at the bottom of the article.
As a matter of fact, I used a BH curve chart in that book, I believe, to
calculate the relative permeability of all the alloys I listed, at the flux
density given. I actually had to blow up the chart image on a scanner in
order to see it better, as they had too many curves on it.
May main concern was keeping it as simple as possible, and not adding a
bunch of info that was not really needed to do the calculations. The
article "Transformers", at Wikipedia, touched on most of the rest, so I
didn't add them.
There was a few complaints about what I wrote about software, at the very
first, and I think they were by the software authors. One had modified the
article, wanting it to sound like software was the only thing used now, and
was the only thing usable, when in fact, all the software is based on the
very equations listed. Now the large manufacturers do use FEA software,
which shows what the flux flow will look like in the core, etc., but for
what we use, you don't need anything that sophisticated. They use it to
minimize the core size, etc, as they're penching pennies, and trying to
keep the weight down, on things that large.
*********** REPLY SEPARATOR ***********
On 6/27/2011 at 11:42 AM J. Forster wrote:
>If anybody is really interested in transformer design, they should look at
>the classics, like:
>Fitzgerald & Kingsley
>"Magnetic Circuits and Transformers" by MIT Staff
>They go through magnetic design, from soup to nuts.
>Also, the MIT Rad Lab Books "Components" volume.
>The units for design have changed in the last 50 years or so, BTW.
>For RF and ferrites, there are applcation notes from several makers, like
>Fair-Rite, that walk you through designs.
>While it's a big, complex field, you rarely have to hone a design to a
>razor's edge. Close enough very often works fine.
>> Thanks. I started that article back in 2006, originally at Wikipedia,
>> writing at least 80% of it, and actually added the portion on RF and
>> impedance transformers last year, if I recall. It got too big for
>> Wikipedias liking, and they moved it to Wikibooks. I noticed somebody
>> a good deal on the manufacturing of large transformers, just now, or how
>> the coils are wound. I just hope it isn't copyrighted, as it looked to
>> copy and paste from another document, plus the English needs a bit of
>> cleaning up.
>> I encourage any on here to add to it, especially in the design of RF and
>> audio impedance transformers. I wanted to do more, but never found the
>> to set down and do it, plus I never really designed that many of them,
>> power transformers. What I wrote was the basics, but didn't get into any
>> formulae, etc, which I would have liked to have seen included. Any help
>> would be appreciated, not just by me, but our entire electrical and
>> electronics community as a whole, especially any students who read it. I
>> even found a link on Google, from a Russian university, who had their
>> students read it at one time.
>> *********** REPLY SEPARATOR ***********
>> On 6/27/2011 at 10:59 AM J. Forster wrote:
>>>A good article, IMO.
>>>> For any interested in the link for the Wikibooks article on
>>>> design, the link is below.
>>>> time-nuts mailing list -- time-nuts at febo.com
>>>> To unsubscribe, go to
>>>> and follow the instructions there.
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