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Re: Pri-Sec Phasing





---------- 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