"werty" wrote in message
...

Capacitors cant store enuf energy to be used to convert single phase

to 3 phase , you must use rotary machines to store the energy .

Its real simple , a motor is powered to store energy , which it
delivers

to a phase wire on a 3 phase motor , you simply control the energy

applied to the single phase so it can deliver this energy , but
delayed

to the 3 phase motor .

The more energy needed , the larger the rotating mass of the single
phase

motor .


motors and transformers can be modeled as a magnetizing inductance in
parallel

with a leakage induct'+resistive load .

At no load , all current flows thru magnetizing induct' .... bad
P.F. ,

so you pay more to the electric company .

But as the current flows to the load , which is series to the leakage
induct'

the P.F. improves to 85% ( cause the load is resistive , not induct'
as the L-induct is ).

The stored energy is in the Leakage induct' , and it is effecient .

But it needs a large heavy rotor to deliver that energy to a 2nd
motor .

It also needs a small air gap , to reduce the reluctance of the path
from

stators to the rotor .

we need to move above 400 hz , to get higher power , but that means
diameter

of motor also increases .

Hi Werty

I find no fault in what you write here. But, there is a situation where
3 phase motors can be run nicely when connected to single phase. And, it
requires only that a capacitor be temporily connected from one of the single
phase lines to the "not connected" third wire from the 3 phase motor. That
temporary connection of the capacitor gets the 3 phase motor spinning so it
can then deliver appreciable power.
The capacitor doesnt need to store power. It is quickly "bumped across"
the two terminals of the motor wires. The major benefit from having a VFD
or a Rotary Converter would be to get the tool motor to delive close to its
name plate rated power to a load for extended times.

Jerry