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Re: Pri/Sec coiling
>Subscriber: Rodney.Davies-at-anu.edu.au Sun Feb 2 17:39:43 1997
>Date: Sun, 2 Feb 1997 22:16:55 +1100 (EST)
>From: Rodney Graham Davies <Rodney.Davies-at-anu.edu.au>
>To: tesla-at-pupman-dot-com
>Subject: Pri/Sec coiling
>
>Hi All,
>
>I'm going to ask perhaps a silly and obvious answered question, but when
>winding your primary and secondary, are the windings in the same direction?
>
>ie, wind both sec and pri in a clock-wise direction?
>
>I should be able to derive this from 1st principles of electromagnetic
>induction, but can't seem to picture it too well.
>
>The reason why I ask this is that in TC circuit diagrams, the coils (if I
>am correct) are back-to-back w.r.t the primary and secondary coils. I
>interperate this as being that the coils are wound in opposite directions
>to each other.???
>
>Then again, this whole idea mightn't really matter...
>Anyway, my puzzling thought for the day...
>
>Ideas, flames, corrections welcome...
>
>Thanks guys!
>Catchya later!
>
>Rod
>
Rod,
As others have stated, it makes absolutely no difference. I was going
to wind my coils initially in the same direction that water spins down a
drain in my geographical location and that also makes no difference. My last
coil has primary and secondary wound in oppoisite directions though it was not
of my intention. I never knew they were wound in opposite directions until I
started doing measurements for mutual induction and the coefficient of coupling.
When solving for 'M' (Mutual inductance), I was getting a negative answer and
had to go over the formula a couple of times before I realized that the
measurement
I made for 'fields aiding' was actually 'fields opposing' because I had the
primary and secondary wound in opposite directions DOH!
Bob Schumann
http://www.america-dot-com/~tesla