14 Jul
2021
14 Jul
'21
1:05 p.m.
On Jul 14, 2021, at 3:53 PM, Guy Sotomayor <ggs at
shiresoft.com> wrote:
On 7/14/21 9:50 AM, Paul Koning wrote:
Spec sheets for various rotary converters that I
looked at. I'd have to go back and find them again but they typically drew full load
power all the time...and they were *loud*.
Odd. I know "Phase-a-matic" which is sold by various machinery companies like
MSC Direct. Checking their brochure (at
https://phaseconverters.phase-a-matic.com/item/rotary-converters/rotary-con…)
shows -- for example -- the 3 hp converter idles at 3 amp. That's 600 watts at the
very most, probably less than that due to power factor but I don't see that
discussed.
paul
On Jul 14, 2021, at 12:33 PM, Guy Sotomayor via
cctalk <cctalk at classiccmp.org> wrote:
I've found 2 issues w.r.t. "rotary converters".
* They *always* consume lots of power regardless of the actual load
Really? That
seems odd. A rotary converter is merely a three phase motor with run capacitors. Just
like any other motor, its power demand depends on the applied load. A normal motor
spinning without anything connected to it consumes power to overcome electrical,
magnetical, and friction losses, but none of these are particularly large.
Can you cite a source for this?