[BC] 3 phase to single phase conversion

[RichardBJohnson at comcast.net]

Rotory Phase converters do not have brushes. The are
not noisey. Since the only load on the bearings is the
weight of the rotor, they last practically forever. If properly
sized for the load, they are vey efficient, better than 95%
while solid-state devices (if you cen get those that work)
run about 90%.

They are simply a three-phase motor with no load. Since
a three-phase motor won't start on a single-phase, there
is a starting capacitor that get's it running just like the
starting capacitor in a refrigerator sealed-unit motor.

BUT.... The electrician MUST do the math. The single
phase line carries current that is 1.73 times the current
in each three-phase leg.

--
Cheers,
Richard B. Johnson
http://www.LymanSchool.org

 -------------- Original message ----------------------
From: WBRadiolists at aol.com
> In a message dated 02/07/2009 9:01:24 PM Eastern Standard Time, 
> Towers at mre.com writes:
> 
> > Other than that, you're limited to the devices which locally produce 3 
> >  phase by motor/alternator or electronic generation.
> 
> I would *strongly* recommend modifying the transmitter over obtaining a phase 
> converter! Your electric bill will increase substantially by having to run 
> that thing. It is a motor and generator in one housing. Big, heavy, and often 
> noisy. There are bearings and brushes that will wear out and require 
> maintenance/replacement on a regular basis. (Remember: this thing is going to be 
> running 
> 24/7.)
> 
> Willie...
> </HTML>
> 
> 
>