7 May
2015
7 May
'15
6:53 p.m.
On 05/07/2015 12:41 PM, Paul Koning wrote:
Well, first, rotary converters draw a LOT of imaginary power
(in other words, they have an awful power factor) and so the
line current can become MUCH higher than you would expect.
Also, the 360 series converter inverters were REALLY
sensitive to line disturbances. Yes, the MOTOR load in the
peripherals could be run off a phase converter or a VFD.
I'm not completely convinced the CPU and controllers, etc.
would like phase converters. And, running them off a VFD
would likely be disastrous, as these put out 400 V square waves.
We tried to rig up a phase converter scheme to run the
motor-generator set on a 370/145 in a guy's house, and it
did NOT go well. he only had a 60 A 240 V service, and the
imaginary current was over 60 A!
Jon
On May 7,
2015, at 1:16 PM, Jon Elson <elson at pico-systems.com> wrote:
...
You can't do that with a real 360 (some 360/20's were pretty small), even a
360/30 was a pretty big box. And, you can't run a 360 off normal residential power,
either. Many of the peripherals used 3-phase motors, and hacking the converter/inverter
to run off single phase would not be a task for any but the most experienced EE.
That isn?t really true; hasn?t been for a long time, and even less so in recent decades.
Home machinery operators have used ?phase converters? for ages to drive machinery like
lathes that use three-phase motors. A rotary converter is basically just a three-phase
motor modified to run from one phase power across one of its windings ? it delivers the
three phases at the three winding terminals. And nowadays you can get a ?variable
frequency motor drive? which is in effect a three-phase AC power generator, frequency of
your choice within reason. The smaller ones run off one-phase power. Either option
starts at just a few hundred dollars, and rotary converters can be built from an old three
phase motor plus a capacitor or two for much less than that.