For my eventual move to Oz, I will be building my own motor/generator to
power those tools that cannot be converted to 3phase. Don't plan to run
many items at once, I'm thinking about maybe a 4kw generator.

What's a good reliable generator at the output end? Going to try to find
one with a bad engine, but want to make sure the other half will last a
while given the expense of having a replacement shipped over....
And yeah, I'm planning on taking spare parts for it.


Jon

On Nov 21, 12:59*pm, Jon Anderson wrote:
For my eventual move to Oz, I will be building my own motor/generator to
power those tools that cannot be converted to 3phase. Don't plan to run
many items at once, I'm thinking about maybe a 4kw generator.

What's a good reliable generator at the output end? Going to try to find
one with a bad engine, but want to make sure the other half will last a
while given the expense of having a replacement shipped over....
And yeah, I'm planning on taking spare parts for it.

Jon


http://www.georator.com/

"Jon Anderson" wrote in message
...
For my eventual move to Oz, I will be building my own motor/generator to
power those tools that cannot be converted to 3phase. Don't plan to run
many items at once, I'm thinking about maybe a 4kw generator.

What's a good reliable generator at the output end? Going to try to find
one with a bad engine, but want to make sure the other half will last a
while given the expense of having a replacement shipped over....
And yeah, I'm planning on taking spare parts for it.

May not fit your needs, but conside a WinPower PTO generator. They are built
to last forever and a small tractor powers them. Bet they got tractors in
OZ. I've had mine thirty years and had to add oil once, and then replace the
tires cause they rotted out. Mine is 15KW but it takes my large tractor if I
need that much. I've run the house lights with an old 8N ford tractor.

Karl

I think Onan is (was?) the king of good gensets. Their 1800 rpm versions
really nice. But EXPENSIVE parts.

If you buy a regular genset with engine, keep in mind that almost all of
them have only one bearing on the generator section. they use a tapered
shaft coupling to hook it to the engine, use the engine output bearing
to support one end of the rotor. This means that swapping out a bad
engine is not anywhere as easy as you might expect. You need the
specific crankshaft that came with the original setup. If you trash an
engine badly, you have to buy the new engine AND a new crankshaft with
the correct taper (almost impossible to get the new engine with the
correct taper)

The generator itself is pretty reliable. If the windings are big enough
to handle the loads, there isn't much else. The bearings of course, a
couple of diodes, brushes if they are there, that's it.

Karl mentioned the PTO setup. A great way to go.

Jon Anderson wrote:
For my eventual move to Oz, I will be building my own motor/generator to
power those tools that cannot be converted to 3phase. Don't plan to run
many items at once, I'm thinking about maybe a 4kw generator.

What's a good reliable generator at the output end? Going to try to find
one with a bad engine, but want to make sure the other half will last a
while given the expense of having a replacement shipped over....
And yeah, I'm planning on taking spare parts for it.


Jon

Karl Townsend wrote:

May not fit your needs, but conside a WinPower PTO generator. They are built
to last forever and a small tractor powers them.

Might be overkill, but sure sounds like it's worth looking into! Going
to be shipping at least one container, so size isn't a huge issue.
I sure like the 'built to last forever' part!

Thanks,

Jon

On Sat, 21 Nov 2009 09:59:50 -0800, the infamous Jon Anderson
scrawled the following:

For my eventual move to Oz, I will be building my own motor/generator to
power those tools that cannot be converted to 3phase. Don't plan to run
many items at once, I'm thinking about maybe a 4kw generator.

What's a good reliable generator at the output end? Going to try to find
one with a bad engine, but want to make sure the other half will last a
while given the expense of having a replacement shipped over....
And yeah, I'm planning on taking spare parts for it.

Why don't you swing by Chiwan on the way over to Oz and pick up an
entire unit, Jon?

--
We have too many high sounding words, and too few actions that correspond
with them. -- Abigail Adams, letter to John Adams, 1774

On Nov 21, 9:59*am, Jon Anderson wrote:
For my eventual move to Oz, I will be building my own motor/generator to
power those tools that cannot be converted to 3phase. Don't plan to run
many items at once, I'm thinking about maybe a 4kw generator.

What's a good reliable generator at the output end? Going to try to find
one with a bad engine, but want to make sure the other half will last a
while given the expense of having a replacement shipped over....
And yeah, I'm planning on taking spare parts for it.

Jon

Don't generators in OZ turn opposite to US?

Paul

"Jon Anderson" wrote in message
...
Karl Townsend wrote:

May not fit your needs, but conside a WinPower PTO generator. They are
built to last forever and a small tractor powers them.

Might be overkill, but sure sounds like it's worth looking into! Going to
be shipping at least one container, so size isn't a huge issue.
I sure like the 'built to last forever' part!

if you're anywhere near the midwest, virtually every large farm acution has
one. They very seldom bring $1K, often 1/2 that.. many auctioneers are going
online so you wouldn't have to waste the day waiting for it to sell.

Karl

In article ,
Jon Anderson wrote:

What's a good reliable generator at the output end? Going to try to find
one with a bad engine, but want to make sure the other half will last a
while given the expense of having a replacement shipped over....

Northern Lights. Finding one with a bad engine may be a problem - the
whole unit works pretty reliably, but I guess you might find one with an
owner that didn't change the oil or something. They make land-based
units, but are more prevalent as a marine unit. That's a good thing for
worldwide parts availability.

Makes little difference (land or marine) if you are just grabbing the
generator end. I can make a few suggestions about using a marine unit on
land if you went that route, as I am doing that.

IMHO, 1800 or 1200 RPM (for 60 hz) units are the only reliable ones out
there - 3600 tend to have short lifetimes.

--
Cats, coffee, chocolate...vices to live by

"Ecnerwal" wrote in message
...
In article ,
Jon Anderson wrote:

What's a good reliable generator at the output end? Going to try to find
one with a bad engine, but want to make sure the other half will last a
while given the expense of having a replacement shipped over....

Northern Lights. Finding one with a bad engine may be a problem - the
whole unit works pretty reliably, but I guess you might find one with an
owner that didn't change the oil or something. They make land-based
units, but are more prevalent as a marine unit. That's a good thing for
worldwide parts availability.

Makes little difference (land or marine) if you are just grabbing the
generator end. I can make a few suggestions about using a marine unit on
land if you went that route, as I am doing that.

IMHO, 1800 or 1200 RPM (for 60 hz) units are the only reliable ones out
there - 3600 tend to have short lifetimes.

--
Cats, coffee, chocolate...vices to live by

I've had a 3 KW Yanmar diesel for about twenty years, they're pricy but last
forever and use very little diesel. Noisy as hell though, it definitely
sounds like a diesel. Larger units have more sound deadening and larger
mufflers.

On Nov 21, 9:59*am, Jon Anderson wrote:

For my eventual move to Oz, I will be building my own motor/generator to
power those tools that cannot be converted to 3phase.

Why? They have AC in Australia you know. 415 V - 3 phase, 240 V single
phase, all 50 cycles. How will a generator help?

Larry Jaques wrote:

Why don't you swing by Chiwan on the way over to Oz and pick up an
entire unit, Jon?

GACK!

I'm trying to accumulate as much good ol' USofA tools as I can before I
go. I looked up the units Karl suggested, serious overkill, but if I can
find one cheap enough...


Jon

Ecnerwal wrote:

Makes little difference (land or marine) if you are just grabbing the
generator end. I can make a few suggestions about using a marine unit on
land if you went that route, as I am doing that.

IMHO, 1800 or 1200 RPM (for 60 hz) units are the only reliable ones out
there - 3600 tend to have short lifetimes.

Suggest away! Since I'll belt drive the generator from the 50hz motor, I
can handle any rpm, but would like to stay with lower rpm stuff.

Thanks,

Jon

On Sat, 21 Nov 2009 13:50:01 -0800 (PST), N Morrison
wrote:

On Nov 21, 9:59*am, Jon Anderson wrote:

For my eventual move to Oz, I will be building my own motor/generator to
power those tools that cannot be converted to 3phase.

Why? They have AC in Australia you know. 415 V - 3 phase, 240 V single
phase, all 50 cycles. How will a generator help?

Yes, but some tools are built for US Power Only - for residential
straight 120V 1-Ph or 120-240V 1-Ph center-tap neutral, and for light
industrial it could be 120/208V Wye 3-Ph, 240V 3-Ph Delta or Open
Delta, 277/480V 3-Ph Wye, 480V 3-Ph Delta. All at 60 Hz.

Some gear would be expensive or imposible to convert to Austrailian
power directly. AIUI, you use straight 240V 1-Ph or 240/415V Wye
3-phase. AT 50 HERTZ, which is the big bugaboo for electronics gear
and certain heavy machinery that can't handle 50-Hz natively.
Transformer cores and motor laminations have to be built differently
to handle both.

You can use a bank of transformers to drop 240V to 120V or 415 to
240V, or boost 415V to 440V, but changing the frequency with enough
energy to run machine tools is a huge issue - that calls for specially
built Motor-Generator sets that have a gearbox or rotating field to
boost the frequency, or a big Variable Frequency Drive just to bump
the frequency up.

There is gear specifically built to run on "World Power" I.E. it is
not frequency sensitive and has multiple input voltage taps to handle
almost anything you throw at it. But they are the exception in the
marketplace, and rarely found used at reasonable prices.

(You have to find a seller who doesn't know what they have, or is
highly motivated to sell fast.)

If he has an engine driven generator set, it's simple to make 60-Hz
power to run the shop gear. Just feed it fuel and air, and the
occasional oil change. The tractor driven PTO generators are even
easier, because the Prime Mover can be changed easily when it breaks
or wears out.

-- Bruce --

On Nov 21, 5:57*pm, Bruce L. Bergman
wrote:
...
Can you change a 50Hz gas or Diesel generator to 60Hz?

jsw

Ecnerwal wrote:
In article ,
Jon Anderson wrote:


What's a good reliable generator at the output end? Going to try to find
one with a bad engine, but want to make sure the other half will last a
while given the expense of having a replacement shipped over....


Northern Lights. Finding one with a bad engine may be a problem - the
whole unit works pretty reliably, but I guess you might find one with an
owner that didn't change the oil or something. They make land-based
units, but are more prevalent as a marine unit. That's a good thing for
worldwide parts availability.

Makes little difference (land or marine) if you are just grabbing the
generator end. I can make a few suggestions about using a marine unit on
land if you went that route, as I am doing that.

IMHO, 1800 or 1200 RPM (for 60 hz) units are the only reliable ones out
there - 3600 tend to have short lifetimes.


An marine unit or an RV unit makes less noise. That may be advantage for
your use.

Bill K7NOM

On Sat, 21 Nov 2009 16:28:27 -0800 (PST), Jim Wilkins
wrote:

On Nov 21, 5:57*pm, Bruce L. Bergman
wrote:
...
Can you change a 50Hz gas or Diesel generator to 60Hz?

jsw

I suppose you could if it was originally designed as a 60Hz unit and
modified to 50Hz for the export market. Could be as simple as
tweaking the governor setting from 1500 RPM (50Hz on a 4-pole
generator) back up to 1800 RPM.

Problem being, the export units might not be wound to put out 120V
or 120/240V 1Ph or 120/208V 3Ph. They'll wind them at the voltages
the export market usually wants - 240V and 240/415V.

-- Bruce --

On Sat, 21 Nov 2009 14:14:35 -0800, Jon Anderson
wrote:

Ecnerwal wrote:

Makes little difference (land or marine) if you are just grabbing the
generator end. I can make a few suggestions about using a marine unit on
land if you went that route, as I am doing that.

IMHO, 1800 or 1200 RPM (for 60 hz) units are the only reliable ones out
there - 3600 tend to have short lifetimes.

Suggest away! Since I'll belt drive the generator from the 50hz motor, I
can handle any rpm, but would like to stay with lower rpm stuff.

Thanks,

Jon

If you want to make an electric motor driven motor-generator, I hope
you are made of money - that's going to cost a ton to run, when you
figure in the inefficiency of buying the power from the grid. Just
think about it - to start the main motor on a 10 HP machine your
converter needs to be (rough guess) 40 HP or better...

And belts for the step up drive (1500 RPM electric motor to 1800 RPM
generator head) will have to be adjustable, or your frequency is going
be way off - and with belts it will still sag and surge pretty bad.
You can't just adjust the throttle...

You could hard-couple the motor and generator with a Lovejoy
Coupling IF you can find a rotating field generator head
("Electronically Commutated") or the "Inverter" style (Honda EU line)
where engine RPM is not the frequency timebase.

A conventional genset with a diesel prime mover will make a lot more
sense. And the PTO Drive generator driven off a locally available
tractor is a close second.

-- Bruce --

On Sat, 21 Nov 2009 14:12:41 -0800, the infamous Jon Anderson
scrawled the following:

Larry Jaques wrote:

Why don't you swing by Chiwan on the way over to Oz and pick up an
entire unit, Jon?

GACK!

I thought you'd like that. snicker


I'm trying to accumulate as much good ol' USofA tools as I can before I
go. I looked up the units Karl suggested, serious overkill, but if I can
find one cheap enough...

Yeah, with all the machines you have now, I guess another ton or two
won't hurt.

--
We have too many high sounding words, and too few actions that correspond
with them. -- Abigail Adams, letter to John Adams, 1774

bob prohaska's usenet account wrote:

How about an ordinary variable frequency drive? They take the line
AC, rectify it to DC and invert it to whatever frequency and voltage
you want.

Not looking for phase conversion, I'll be using inverters for 3 phase
machinery not rated for 50hz (oddly, my Bridgeport is, both Hardinge
lathes and the Chevalier are not).

What I'm looking to run are things like my Baldor carbide grinder, drill
sharpener, and the many hand power tools like drills, grinders, circular
saws, vacuum pump, etc. Would get pennies on the dollar to sell here,
and have to pay top dollar there. A motor generator would allow me to
run anything and everything not covered by inverters.


Jon

Larry Jaques wrote:

Yeah, with all the machines you have now, I guess another ton or two
won't hurt.

Weight's not my issue, weight-wise everything would easily be handled by
a single 20' container. Volume is the issue. Would love to just use a
40' container, but storage there would be an issue. Wife's got friends
that would store a 20' until I had somewhere to put things, but not a
40. And, you've seen my driveway, loading a 40'er here and getting it
onto a truck would not be trivial by any means! Man, the thought of
winching machines uphill into a container with a wooden floor....

Still working on my 3D CAD loadout trying to see just what I might be
able to squeeze in.


Jon

In article ,
Jon Anderson wrote:

Ecnerwal wrote:

Makes little difference (land or marine) if you are just grabbing the
generator end. I can make a few suggestions about using a marine unit on
land if you went that route, as I am doing that.

IMHO, 1800 or 1200 RPM (for 60 hz) units are the only reliable ones out
there - 3600 tend to have short lifetimes.

Suggest away! Since I'll belt drive the generator from the 50hz motor, I
can handle any rpm, but would like to stay with lower rpm stuff.

It's mostly regarding the motor/cooling setup - if you're only using the
generator end (which I suspected, but wasn't 100% sure of until you
posted more) there's little difference, at least with NL - the gen-end
is air cooled. With nearly all generator ends that are designed to
close-couple to an engine, you'll need to make up a support plate with
bearing to belt-drive them, since they use the motor bearing for that
end of the generator.

The main factor in dealing with a marine setup on land is getting rid of
the heat - there's no built-in radiator. This can be good and bad. The
unit itself is smaller and simpler without the radiator hanging off of
it, and the heat can be mostly sent elsewhere - in my case, into the
floor during heating season, into hot water in any season, and out to
the air only when there's too much heat - gets a bit more use out of the
same fuel dollar. Also means the genset is not a complete packaged unit
that only ties into the electric line - for my use/mindset, that's not
bad, for some, it is.

Depending exactly what you are dealing with, the VFD suggestion deserves
examination.

A third possibility (but pretty expensive) would be to have an
Australian battery charger feeding a DC battery bank feeding a US
voltage inverter, preferably of the true sine wave flavor - that would
work for more things than the VFD might, given that VFDs don't pay much
attention to making sine waves, as I understand them from other
discussions we've had here. It handily gets around Bruce's issues with
trying to frequency convert via belt drive, or indeed involving motors
in the process at all. It's quite do-able at the 4KW level, but does
take a chunk of change.

I suppose the other potential bug-bear might be what sort of hassles you
might get from Australian electrical inspection of whatever you do.

--
Cats, coffee, chocolate...vices to live by

On Sat, 21 Nov 2009 09:59:50 -0800, Jon Anderson
wrote:

For my eventual move to Oz, I will be building my own motor/generator to
power those tools that cannot be converted to 3phase. Don't plan to run
many items at once, I'm thinking about maybe a 4kw generator.

Cant be converted to 3 phase? SImply use 2 of the 3 leads.

Or are you looking for a 3ph genny?

What's a good reliable generator at the output end? Going to try to find
one with a bad engine, but want to make sure the other half will last a
while given the expense of having a replacement shipped over....
And yeah, I'm planning on taking spare parts for it.


Jon

"Aren't cats Libertarian? They just want to be left alone.
I think our dog is a Democrat, as he is always looking for a handout"
Unknown Usnet Poster

Heh, heh, I'm pretty sure my dog is a liberal - he has no balls.
Keyton

Gunner Asch wrote:

Cant be converted to 3 phase? SImply use 2 of the 3 leads.

By that, I meant converting by changing out the motor.

All existing 3 phase stuff gets inverters unless rated 50hz
Stuff like the drill press, Roll-in saw, etc., get 3ph motors
w/inverter, or locally sourced 50hz motors.
The motor/generator setup is for all the rest of my stuff. Mostly brush
motor tools which would work with just a transformer, but some induction
motor stuff too, like the Baldor.

I have one customer more than willing to deal with me from down under.
Shipping is no biggie, I could put $5k worth of stuff into a medium flat
rate Priority box. But I need both CNC machines to do the work. If his
sales meet projections, work for him alone would easily pay my shipping
costs within 2 years. Just don't have the $$ to ship yet.

Working on my 3D loadout, and I can already see there's no friggin way I
get everything into one 20' container.
This would all be SO much easier if I just sold all the machinery here.
But making and fixing things is so much a part of my life I just cannot
envision not having them. Sigh...


Jon

On Sun, 22 Nov 2009 01:51:02 +0000 (UTC), bob prohaska's usenet account
wrote:

Jon Anderson wrote:

Suggest away! Since I'll belt drive the generator from the 50hz motor, I
can handle any rpm, but would like to stay with lower rpm stuff.

Ok, I'll bite.

How about an ordinary variable frequency drive? They take the line
AC, rectify it to DC and invert it to whatever frequency and voltage
you want. All solid state, and relatively efficient compared to a
rotary converter. In the low tens of horsepower they're common, I'm
not sure how big they come.

bob prohaska


Excellent idea!!

Gunner

"Aren't cats Libertarian? They just want to be left alone.
I think our dog is a Democrat, as he is always looking for a handout"
Unknown Usnet Poster

Heh, heh, I'm pretty sure my dog is a liberal - he has no balls.
Keyton

On Sat, 21 Nov 2009 18:37:47 -0800, Jon Anderson
wrote:

bob prohaska's usenet account wrote:

How about an ordinary variable frequency drive? They take the line
AC, rectify it to DC and invert it to whatever frequency and voltage
you want.

Not looking for phase conversion, I'll be using inverters for 3 phase
machinery not rated for 50hz (oddly, my Bridgeport is, both Hardinge
lathes and the Chevalier are not).

What I'm looking to run are things like my Baldor carbide grinder, drill
sharpener, and the many hand power tools like drills, grinders, circular
saws, vacuum pump, etc. Would get pennies on the dollar to sell here,
and have to pay top dollar there. A motor generator would allow me to
run anything and everything not covered by inverters.


Jon

Are the things you are wanting to run, 60 hrtz only and are they single
or 3 phase?

Gunner, missing part of the puzzle.


"Aren't cats Libertarian? They just want to be left alone.
I think our dog is a Democrat, as he is always looking for a handout"
Unknown Usnet Poster

Heh, heh, I'm pretty sure my dog is a liberal - he has no balls.
Keyton

On Sat, 21 Nov 2009 18:37:47 -0800, Jon Anderson
wrote:

bob prohaska's usenet account wrote:

How about an ordinary variable frequency drive? They take the line
AC, rectify it to DC and invert it to whatever frequency and voltage
you want.

Not looking for phase conversion, I'll be using inverters for 3 phase
machinery not rated for 50hz (oddly, my Bridgeport is, both Hardinge
lathes and the Chevalier are not).

What I'm looking to run are things like my Baldor carbide grinder, drill
sharpener, and the many hand power tools like drills, grinders, circular
saws, vacuum pump, etc. Would get pennies on the dollar to sell here,
and have to pay top dollar there. A motor generator would allow me to
run anything and everything not covered by inverters.


Jon

I assume that you do know that any 60 hertz motor will run on 50 hertz
current albeit at a slower speed. There will be a slight loss in
maximum available power due to the lower frequency, but at lower
loading you should experience no problems.
Regards,

J.B.

On Sat, 21 Nov 2009 17:36:10 -0800, Bruce L. Bergman
wrote:

On Sat, 21 Nov 2009 16:28:27 -0800 (PST), Jim Wilkins
wrote:

On Nov 21, 5:57*pm, Bruce L. Bergman
wrote:
...
Can you change a 50Hz gas or Diesel generator to 60Hz?

jsw

I suppose you could if it was originally designed as a 60Hz unit and
modified to 50Hz for the export market. Could be as simple as
tweaking the governor setting from 1500 RPM (50Hz on a 4-pole
generator) back up to 1800 RPM.

Problem being, the export units might not be wound to put out 120V
or 120/240V 1Ph or 120/208V 3Ph. They'll wind them at the voltages
the export market usually wants - 240V and 240/415V.

-- Bruce --

Just add a 1::2 transformer. South East Asia is full of them as most
of the countries have/had both European and U.S. stuff for years.
(not so much U.S. stuff any more :-)
Regards,

J.B.

Gunner Asch wrote:

Are the things you are wanting to run, 60 hrtz only and are they single
or 3 phase?

Yes. 3 phase is common there and I'm likely to end up with my shop in a
commercial space anyway. Phase conversion is NOT the issue.

It's running the few 60hz induction motor items that I'm looking at
covering. And as I'm looking at the cost of the generator setup for just
a few items, I'm starting to wonder if it really -is- cost effective....
Most of the hand tools could be covered by a simple transformer really.

Anyone have a 3 phase Baldor carbide grinder they want to trade for a
110v model? For the little use it gets, I'm starting to think 50hz
probably won't be an issue.


Jon

On 2009-11-22, Jon Anderson wrote:
Gunner Asch wrote:

Are the things you are wanting to run, 60 hrtz only and are they single
or 3 phase?

Yes. 3 phase is common there and I'm likely to end up with my shop in a
commercial space anyway. Phase conversion is NOT the issue.

It's running the few 60hz induction motor items that I'm looking at
covering. And as I'm looking at the cost of the generator setup for just
a few items, I'm starting to wonder if it really -is- cost effective....
Most of the hand tools could be covered by a simple transformer really.

Anyone have a 3 phase Baldor carbide grinder they want to trade for a
110v model? For the little use it gets, I'm starting to think 50hz
probably won't be an issue.

I have a delta carbide grinder, 3 phase.

i

wrote:

I think you are looking for something like this.

Yeah, that's getting there. I did find something similar at Northern
Hydraulics last night, but they were 3600 rpm. If this guy can get one
in around a 4kw output, I think I'd go for it. Only has the one listed,
but I asked about getting a smaller one.

Thanks!


Jon

Ignoramus30959 wrote:

I have a delta carbide grinder, 3 phase.

Hmm, shipping cross country probably isn't going to be cheap. I'll keep
that in mind though if I decide to forget about a motor/generator.

Thanks,

Jon

On Nov 22, 6:48*pm, Jon Anderson wrote:
wrote:
I think you are looking for something like this.

Yeah, that's getting there. I did find something similar at Northern
Hydraulics last night, but they were 3600 rpm. If this guy can get one
in around a 4kw output, I think I'd go for it. Only has the one listed,
but I asked about getting a smaller one.

Thanks!

Jon

There have been other vendors on ebay. I have seen 3 phase generator
heads and also one that have a output for use as a welder. Just do
not see them today.

Dan

On Sun, 22 Nov 2009 10:48:12 -0800, Jon Anderson
wrote:

wrote:

I think you are looking for something like this.

Yeah, that's getting there. I did find something similar at Northern
Hydraulics last night, but they were 3600 rpm. If this guy can get one
in around a 4kw output, I think I'd go for it. Only has the one listed,
but I asked about getting a smaller one.

Thanks!


Jon


The price is right. And you can use it for running the house if the
power goes out.

Gunner

"Aren't cats Libertarian? They just want to be left alone.
I think our dog is a Democrat, as he is always looking for a handout"
Unknown Usnet Poster

Heh, heh, I'm pretty sure my dog is a liberal - he has no balls.
Keyton

On Sun, 22 Nov 2009 10:48:12 -0800, Jon Anderson
wrote:

wrote:

I think you are looking for something like this.

Yeah, that's getting there. I did find something similar at Northern
Hydraulics last night, but they were 3600 rpm. If this guy can get one
in around a 4kw output, I think I'd go for it. Only has the one listed,
but I asked about getting a smaller one.

Thanks!


Jon


Mechanically the generator itself doesn't care what RPM it turns at,
Other then possibly accelerated bearing wear which is minimal with
ball/roller bearings. The gumph about 1800 RPM vis-a-vis 3600 was
mostly heard from the marine users and was mainly worry about engine
life and noise.

Regards,

J.B.

Not really. An 1800 rpm generator will be a 4 pole unit, a 3600 rpm
generator will be a 2 pole unit. A 4 pole, 1800 rpm unit is usually
MUCH quieter than the 2 pole versions. And engine life at 1800 rpm is on
the order of 5x to 10x the life at 3600 rpm.
Mechanically the generator itself doesn't care what RPM it turns at,
Other then possibly accelerated bearing wear which is minimal with
ball/roller bearings. The gumph about 1800 RPM vis-a-vis 3600 was
mostly heard from the marine users and was mainly worry about engine
life and noise.

Regards,

J.B.

On Sun, 22 Nov 2009 23:22:06 -0600, RoyJ
wrote:

Not really. An 1800 rpm generator will be a 4 pole unit, a 3600 rpm
generator will be a 2 pole unit. A 4 pole, 1800 rpm unit is usually
MUCH quieter than the 2 pole versions. And engine life at 1800 rpm is on
the order of 5x to 10x the life at 3600 rpm.

Yes, if you want 60 Hz at 1800 RPM you use a four coil machine, etc.,
but the generator itself doesn't care a bit about whet RPM it spins
at. You can run a 4 pole generator at 1000, 1800 or even 3,000 RPM
(assuming that the machine was properly made) and it is perfectly
happy to produce electricity. As I said, it doesn't care and it
certainly doesn't make any more noise at high RPM then it does at slow
speeds.

Most generators made today use non-friction bearings and if kept
lubricated will last for years and the RPM is nearly meaningless to
them.

You will note that when I use the term "generator" I am talking about
the electrical generating device.

And as I said, the 1800/3600 RPM thing was mainly about engine life
and noise.

Mechanically the generator itself doesn't care what RPM it turns at,
Other then possibly accelerated bearing wear which is minimal with
ball/roller bearings. The gumph about 1800 RPM vis-a-vis 3600 was
mostly heard from the marine users and was mainly worry about engine
life and noise.

Regards,

J.B.
Regards,

J.B.

If you want 60 HZ like the OP, then you MUST run a 4 pole at 1800 RPM
and a 2 pole at 3600rpm. Not to mention, the windings are designed to
produce a specific voltage at those speeds. If all you want is junk
power output with no voltage OR frequency regulation, run them at other
speeds.

wrote:
On Sun, 22 Nov 2009 23:22:06 -0600, RoyJ
wrote:

Not really. An 1800 rpm generator will be a 4 pole unit, a 3600 rpm
generator will be a 2 pole unit. A 4 pole, 1800 rpm unit is usually
MUCH quieter than the 2 pole versions. And engine life at 1800 rpm is on
the order of 5x to 10x the life at 3600 rpm.

Yes, if you want 60 Hz at 1800 RPM you use a four coil machine, etc.,
but the generator itself doesn't care a bit about whet RPM it spins
at. You can run a 4 pole generator at 1000, 1800 or even 3,000 RPM
(assuming that the machine was properly made) and it is perfectly
happy to produce electricity. As I said, it doesn't care and it
certainly doesn't make any more noise at high RPM then it does at slow
speeds.

Most generators made today use non-friction bearings and if kept
lubricated will last for years and the RPM is nearly meaningless to
them.

You will note that when I use the term "generator" I am talking about
the electrical generating device.

And as I said, the 1800/3600 RPM thing was mainly about engine life
and noise.

Mechanically the generator itself doesn't care what RPM it turns at,
Other then possibly accelerated bearing wear which is minimal with
ball/roller bearings. The gumph about 1800 RPM vis-a-vis 3600 was
mostly heard from the marine users and was mainly worry about engine
life and noise.

Regards,

J.B.
Regards,

J.B.

On Mon, 23 Nov 2009 00:46:03 -0800, Gunner Asch
wrote:



Can you provide some gallons per hour figures for small car engines at
900rpm and 1800 rpm?

Id be most interested to read them.

Such data would be meaningless without a specified mechanical load. An
engine under load at X rpm uses more fuel than one just idling at that
same RPM.

On Mon, 23 Nov 2009 00:46:03 -0800, Gunner Asch
wrote:
On Mon, 23 Nov 2009 00:18:52 -0800, Bruce L. Bergman
wrote:
On Sun, 22 Nov 2009 14:04:08 -0800, Gunner Asch
wrote:

Stick a small car engine on it with a belt idling at 900 rpm and a 1:2
pully ratio and one is golden.

Nope, Sorry - It would work but not well.

900 RPM is just off idle for a gasoline engine and not much more
than that for a small diesel, and way out of the powerband. You would
need a way oversized engine to get maximum output, and at lousy fuel
efficiency.

Most car engines are far far more than 15 hp, no?

Ive kinda sorta played with this in the past..and gallons per hour at
idle, in a clean warmed up engine isnt piddly.

Oh it would work, I'll grant you that. But not all that well.
Gasoline engines can't hold a candle to a diesel for longevity.

Better to get one of the surplus 3-cylinder or 4-cylinder Kubota or
Yanmar diesels made for truck reefers. They can run for years with
normal maintenance, and either rebuilt or replaced when worn out.

1800 RPM is the sweet spot for medium and larger diesels, and gives
you the best efficiency - many of the big truck and industrial engines
for gensets have a 2400 to 3500 RPM red-line.

Hence the 1:2 pullys. Idle at 900 rmp..turn the genny at 1800.

Yes, but you need a lot of belt there - a triple or a quad sheave.
And you need a generator wend with two bearing, and the front bearing
has to be rated for the side-thrust of the belt drive.

-- Bruce --