[Shop-talk] Yet Another Wiring Question

[David Scheidt]

On Tue, Jun 30, 2009 at 7:21 PM, Doug Braun<doug at dougbraun.com> wrote:
>
> What is the application for that?
>

two phase power allows for self-starting motors, and the math is
simpler than three-phase.  Once you know how to do the math for
three-phase (which didn't really happen until the first decade of the
20th century), it's of little interest, since it requires more wire
than three-phase, and three-phase is easier to build.
I'm a little surprised to find there's any left.

> And also, a rhetorical question: B If I had two conductors (besides ground)
with the waveforms separated by 147.832 degrees, what would it be called?

You can have two phase power with the two-phases seperated by whatever
non-zero amount you want.  You can't, however, have two-phase power
that has a phase shift of zero degrees.  that's what US household
power is.

>
> Doug
>
> --- On Tue, 6/30/09, David Scheidt <dmscheidt at gmail.com> wrote:
>
>> From: David Scheidt <dmscheidt at gmail.com>
>> Subject: Re: [Shop-talk] Yet Another Wiring Question
>> To: "Doug Braun" <doug at dougbraun.com>
>> Date: Tuesday, June 30, 2009, 6:50 PM
>> On Tue, Jun 30, 2009 at 6:26 PM, Doug
>> Braun<doug at dougbraun.com>
>> wrote:
>> >
>> > So, what DOES a real two-phase circuit look like?
>> >
>>
>> The two phases are seperated by 90 degrees.B  Requires
>> four wires (or
>> three, with a large neutral, since it carries the vector
>> sum of the
>> two circuits voltages.)
>>
>> --
>> David Scheidt
>> dmscheidt at gmail.com
>>
>



--
David Scheidt
dmscheidt at gmail.com