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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