Re: Pri-Sec Phasing

To: tesla-at-pupman-dot-com
Subject: Re: Pri-Sec Phasing
From: Tesla List <mod1-at-pupman-dot-com>
Date: Tue, 7 Oct 1997 15:36:07 -0600 (MDT)
Approved: mod1-at-poodle.pupman-dot-com


---------- Forwarded message ----------
Date: Tue, 7 Oct 1997 17:02:11 -0400
From: Thomas McGahee <tom_mcgahee-at-sigmais-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Pri-Sec Phasing 



----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Pri-Sec Phasing 
> Date: Tuesday, October 07, 1997 4:32 PM
> 
> 
> 
> ---------- Forwarded message ----------
> Date: Wed, 8 Oct 1997 08:31:25 +1200
> From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
> To: tesla-at-pupman-dot-com
> Subject: Re: Pri-Sec Phasing
> 
> Hi Greg,
> 
> > From: Greg Leyh <lod-at-pacbell-dot-net>
> > To: Tesla List <tesla-at-pupman-dot-com>
> > Subject: Re: Pri-Sec Phasing
> > 
> <SNIP>
> > > Anyway, "same winding sense, same polarity", is at least easy
to
> > > remember!
> > >
> > >                  O
> > >                  O<----------------------
> > >                  O  +          +        |
> > >                  O  Vx      ------>     |
> > >                  O  -        Iout       |
> > >     -------------*                      |
> > >     +  ----->    O                      |
> > >          Iin     O            Vout     LOAD
> > >                  O                      |
> > >     Vin          O                      |
> > >                  O                      |
> > >                  O                      |
> > >     -            O             -        |
> > >    --------------*-----------------------
> > 
> > I agree that your variac should work as advertised, but, but...
> > what about the 'Right Hand Rule'?  Can't it be applied here???
> > 
> > My confusion is further compounded by my copy of the "Practical
> > Transformer Design Handbook", by E. Lowdon.  On p.366 it says
that
> > in a xfmr where the windings are wound in the same direction,
> > (and most are so that the bobbin doesn't have to be removed)
> > the start of the primary winding has the same polarity as the
> > end of the secondary winding.  This confirms the Right Hand Rule.
> > 
> > Perhaps their definitions of start and end are different.
> > 
> > -GL
> 
> I'd have to disagree with the transformer design handbook.
> 
> Malcolm

Greg,
I agree with Malcolm. If what the book said was true, then if you
bifilar wound two primary coils and then connected the start of the
windings together and then the endings together you would have a
current flow between them due to their supposedly opposite
polarities. But that just ain't so.

Maybe that isn't what the book actually said... or else the book is
wrong.

My two cents worth.
Fr. Tom McGahee