[BC] 12 phase

[Dave Dunsmoor]

Peter, thank you. I've never heard of this referenced this way, but you
provided an excellent explanation.

Dave



> >Ok, I gotta ask. where did the other 9 phases come from?
>
> Three-phase half-wave gives you three pulses per cycle, and requires
> three rectifiers, total.
>
> Three-phase full-wave gives you six pulses per cycle, and requires six
> rectifiers, total.
>
> Three-phase full-wave zig-zag gives you twelve pulses per cycle, and
> requires twelve rectifiers, total.
>
> "The other nine phases" should probably read "the other six phases",
> where the term "phases" is very loosely used, as all of these systems are
> actually three-phase, period.
>
> The three basic phases are 0, 120 and 240 degrees.
>
> For full-wave, 0-180, 120-180 and 240-180 degrees are also used.
>
> This is where 180, 300 and 60 degrees comes from, thereby providing 0,
> 60, 120, 180, 240, and 300 degrees.
>
> "Twelve-phase" is really three-phase full-wave, with the 30 degree pulse
> being formed by vector addition of the 0 and 60 degree pulses, etcetera.
>
> So, to answer your specific question, the SIX other phases came from the
> process described in the immediately preceding paragraph, repeated over
> those six extra phases.
>
> All are really three-phase, however.
>
> These are inaccurately, but traditionally called three-phase, "six-phase"
> and "twelve-phase".