like, what's your phase? [RE-wrenches]

[bbassett at rockisland.com]

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I recently read in a Scientific American article that the original two 
phase motor design was invented by none other than Tesla. No surprise 
there. 

Brad


Drake wrote:
> 
> 
> >Any of you guys have what you describe below in a graphic 
> >representation?
> >
> >thanks,
> >marco
> 
> The wave form is shown on Fig. 1-45, III of the American Electrician's 
> Handbook.
> 
> Drake
> 
> 
> 
> >Hello Wrenches,
> >
> >Sorry to further bore you with this subject, that is of little practical
> >value, since two phase systems are not being specified for modern
> >installations.  But for the sake of accuracy, this follow up is 
> >necessary
> >since I'd speculated that two phase systems give 2 maximum power peaks 
> >in
> >the first 90 degrees, then none for 270.
> >
> >Thanks to Jeff Newmiller and Bill Brooks, we have a better picture of a 
> >2
> >phase system.  The combination of two single phase sine waves give a two
> >phase motor 4 peaks every rotation, one every 90 degrees.  With 2 single
> >phase windings acting together, each winding gives a maximum power peak
> >every 180 degrees.  The two combined at 90 degrees apart produce a pulse
> >every 90 degrees.  One can see why this sequence would look attractive 
> >to
> >early designers.
> >
> >I hope this is a better explanation.
> >
> >
> >-Drake
> >
> >Your free subscription is supported by today's sponsor:
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