On Thu, 12 Sep 2019 13:34:35 -0700 (PDT), trader_4
wrote:

On Thursday, September 12, 2019 at 3:44:40 PM UTC-4, wrote:
On Thu, 12 Sep 2019 12:25:54 -0700 (PDT), trader_4
wrote:

On Thursday, September 12, 2019 at 2:15:39 PM UTC-4, Clare Snyder wrote:
On Thu, 12 Sep 2019 08:54:58 -0500, Mark Lloyd
wrote:

On 9/11/19 6:15 PM, wrote:

[snip]

12, 3, 6 and 9 on your clock are 90 out and they are very symmetrical.

so are 1,4,7,10 but not 2,3,7,12.

That reminds me of the "clock arithmetic" we had in school once, where 1
- 2 = 11. It's mod12 where you say 12 when you really mean 0.

[snip]

You might be able to create a 100 degree phase shift with electronics
(using a capacitor like starting a motor) but not in an alternator.

I suppose you could if it was wound right.
Would be awfulldifficult to balance both statically and under load
though - - - - --

And why would that be? If 90 deg isn't a balancing problem, why is rotating the winding ten more degrees suddenly a problem? Take a portable generator. If I rotated the windings, why is there suddenly a balance problem? Take a portable generator and imagine just extending the shaft to a second generator, ignoring any hp issue. I can rotate the second generator to get any phase angle, 0 to 359 degrees between it's output and the first generator's output. Now you have two phase power at any phase difference you want.

You want the rotating field to be symmetrical.

Each of those generators above is symmetrical. Round and round they spin.
If you mean with respect to each other, 90 deg two phase sure wasn't symmetrical. There was a winding producing 0 deg and another producing
at 90 deg phase shift and seems Philly, Niagara Falls etc didn't
seem to have balance problems or shake apart.... It's just
how many degrees apart one winding is positioned relative to the other that
determines the phase relationship.

There are 2 sets of coils displaced by 90 degrees and they look like
this +
4 points on the circle. Just like 12, 3, 6, 9 on your clock.
It is typically delivered on 5 wires not 3 like you would if it was L
as you theorize.