On 8/9/2018 5:32 PM, trader_4 wrote:
Fretwell's new interesting position is that phases disappear if they
are 180.

Fretwell's correct!

If you think of it as a snapshot in time, you essentially have a dc charge on each of the coils.Â* If the 2 coils are 180° apart, then the instantaneous charge voltage on the first coil will always be the opposite of the second coil.


For example, below I have two identical coils mounted on a shaft with the second coil mounted 180 degrees with respect to the first. The two coils are connected in series as shown.

The output of the second coil will always be the opposite polarity of the first coil.


------ Â* [Â* (+) polarity of coil at 0 degrees (-)Â* ]Â*Â* ---------- Â*Â* [Â* (-) polarity of coil at 180 degrees (+)Â* ] Â* Â* ------


Since the two coils are always at opposite polarity to each other, they would in fact cancel each other out.Â* (Think of it as a 2-cell series battery pack where some clueless democrat put one of the cells in backwards.)


And FWIW, this instantaneous snapshot also illustrates why the ubiquitous residential center-tapped transformer is not 180 degree 2-phase.