> On Jul 14, 2021, at 3:53 PM, Guy Sotomayor <[email protected]> wrote:
>
>
> On 7/14/21 9:50 AM, Paul Koning wrote:
>>
>>> On Jul 14, 2021, at 12:33 PM, Guy Sotomayor via cctalk
>>> <[email protected]> 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?
> 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-converter/rotary-converters#)
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
