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

Drake Chamberlin solar at ecoisp.com
Mon May 16 07:30:26 PDT 2005


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Hello Wrenches,

Thanks for the information on Two Phase systems.  It is an amazing concept 
to have maximum power come from the peaks of 2 sine waves, 90 degrees 
apart, and then not attain another maximum power pulse for 270 
degrees.  From further reading on the subject, it looks like these systems 
use separate coils, often on different armatures that are mechanically 
connected, to generate the separate phases.

The neutrals may or may not tie together.  Neutral current may come from an 
end point of each phase, or from the midpoints of the phases, bonded 
together. Neutral current is 1.41 (square root of two) times the phase 
current, but cancels out when the loads on the two phases are balanced.

-Drake

>I had an instructor for
>an NEC class talk about two-phase power systems -said that some are still in
>use in old industrial installations in the midwest.
>
>I hope that helps.
>
>
>Thanks Dan, a historical perspective helps.
>
>don

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