Speaking of which, is that really any different than the throttle speed
control on conventional gensets? They don't do anything more
sophisticated than that, do they (at least the homeowner variety)?
You and Roy both talked about a 540 RPM PTO. That sort of implies that
it is a constant speed and I wondered if it was and how they did it -
inquiring minds want to know. Your answer that it is not fixed answered
the question, thanks.
Back when I was around farm tractors (when I was a kid) they had maybe 6
gears forward and one reverse. Now air conditioning and GPS control.
Then again, the farm I used to spend time on was 160 acres, a
significant part pasture. Wouldn't work so good now. Compared to now the
machines were really simple, but I enjoyed nosing around the machinery
shed and tractors.
My lawnmower has a very rudimentary governor using a blade in the
cooling air flow. Would think small generators would have something much
better, but I haven't looked at a generator control. There is a big
change in mechanical load from low power use to max, for which there
must be some kind of speed regulation to control frequency.
Or the DC generators feeding an inverter.
Come to think on it, why don't devices with smaller engines have a PTO?
I could imagine a PTO on a lawnmower and a raft of attachements:
* Brush cutter
* Black water pump
* Drain snake
My ex's father had something along those lines. He called it a
'tractor'. I know his had snowblower, tiller, snow plow, garden
plow, sickle-bar, attachments. It was in the 15HP range and had a
pair of maybe 4x15" tractor tires. He could hook it to a 4x4
trailer and it would tow him and a jag of wood across a field and up a
pretty steep incline.
I think it was a 1930-40 vintage Ariens--- might have been Gravely.
To expand on the just-a-minute-ago post, why not a PTO for an automobile?
I can imagine a hook-up that replaces a tire on an auto's drive wheel. This
hook up could connect to a stationary item such as a generator or water
A car at idle burns about a gallon of gas per hour, which is not too much
different that the consumption of a medium-hefty generator.
Some trucks have a PTO. The ones I can think of run a hydraulic pump,
like a dump truck and boom truck.
I think some cars and pickup trucks have an added engine driven
hydraulic pump, which may be more flexible than a PTO.
Presumably if you ran a generator from a PTO the gas consumption would
go up because you are supplying power that has to come from somewhere.
I know these generators exist. How do you regulate the frequency - just
tractor RPM? Would think that wouldn't be very accurate or stable. They
could generate DC and invert it - seems excessively complicated.
I think that the PTO on the tractors maintain a steady 540 RPM. If you
needed 50 hz, you'd probably use a different generator. I don't know how
quickly the tractor can make adjustments to the changing loads, as
compared to the regulators on self-contained engine/generators
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