Re: [TCML] Tesla's spinning egg of Columbus

[Ed Phillips <evp@xxxxxxxxxxx>]

William Beaty wrote:

> On Sun, 16 Nov 2008, Lau, Gary wrote:
>
>  
>
> > I've not studied the topic beyond a casual interest, but the choice of a
> > toroidal core seems curious to me.
> >    
>
> It Tesla's induction motor stator.  I suspect this whole idea was Tesla's,
> dating at least back to his DC motor work for Edison corp or perhaps
> earlier.  It's in his patent drawings ...but did any earlier inventors
> already use the idea?  It comes from an odd viewpoint, using coils 90deg
> from usual orientation, so I wouldn't be surprised if NT was the source.
    I believe the original idea probably goes back to Gramme:

    http://chem.ch.huji.ac.il/history/gramme.html

Tesla certainly seemed attracted to that configuration but it was around 
before his time, or at least long before the Columbian Exhibition.

Ed

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