This has been coming up alot lately!
To answer the original poster's questions:
1Ã˜ is nothing at all like 2Ã˜.
First off, Single Phase is just thst - Single Phase!
Two Phase is a Polyphase System - like 3 Phase is.
2Ã˜ has Two individual Phases, which are 90Â° offset - like 3Ã˜ has Three individual Phases, which are 120Â° offset.
There are 2Ã˜ 3 Wire, 4 Wire and 5 Wire systems (more like "were"...). It's an older, antiquated polyphase Power System, which has been made obsolete by 3Ã˜ systems.
It's still in use on Stepper / Servo Motors, along with the control + clock circuitry for them.
The closest comparison to 1Ã˜ would be on Motors.
A Single Phase Split Phase Induction Motor resembles a Two Phase Induction Motor, being that the 1Ã˜ Motor has both a "Run" winding and an "Aux./Start" winding, which in the starting sequence will have a Phase offset between 30Â° and 75Â° - maybe coming close to 90Â°.
Of course, the Two Phase Motor will have no start switch, no start Capacitor, and will have at least one additional Phase Line connecting to the windings. Both windings will always be active, and both will have 90Â° offset (Â± may come into effect).
Check out the Technical Reference area for Transformer and Motor Schematics for 2Ã˜ Systems.
They may be accessed from the Menu For Technical Reference Area
p.s. direct url is: http://electrical-contractor.net/ubb/Forum15/HTML/000064.html
edited some silly cornfusion!
[This message has been edited by Scott35 (edited 09-27-2003).]