Re: Pri/Sec coiling

To: tesla-at-pupman-dot-com
Subject: Re: Pri/Sec coiling
From: Rodney Graham Davies <Rodney.Davies-at-anu.edu.au>
Date: Wed, 5 Feb 1997 23:21:16 +1100 (EST)
Subscriber: Rodney.Davies-at-anu.edu.au Fri Feb 7 00:04:16 1997

Hi Bob,

On Tue, 4 Feb 1997, Tesla List wrote:
> 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

Ah!, thought that might be as such. I figured if the coils are wound in 
opposite directions, then the flow of flux wouldn't be very mutual...or 
some weird idea like that...

Thanks for your input, very helpful!

Cheers!

Rod