Evening all.

In my workshop I have a Lister 4 cylinder diesel, air cooled 3 phase Alternator I think it must only have two poles as to get 50 Hz it seems to run far too fast and makes far too much noise in so doing.

It is at least twice as powerful as I would ever need and I often use it at about half revs at which speed it still generates enough to run an old Milling machine, However It would be very nice it I could run the diesel at this low speed and still get 50 c/s and the correct voltages. It is skid mounted, bolted to the floor on a heavy chassis but the engine and alt. are close coupled. I was toying with the idea of separating them and hooking up a chain shaft drive behind the set to gear the motor speed down by at least half.

This will be a big job I fear, as they are very close together and it might be necessary to move the engine to the right a bit to enable sprockets or even pulleys to be connected to gear down the alternator. Has anyone ever done this and has anyone any simpler lateral solution.

Or - alternately does anyone wish to swap a noisy 40 Kw set for a nice quiet 15- 20 Kw set ?

In message ,
George writes
Evening all.

In my workshop I have a Lister 4 cylinder diesel, air cooled 3 phase
Alternator I think it must only have two poles as to get 50 Hz it seems
to run far too fast and makes far too much noise in so doing.

It is at least twice as powerful as I would ever need and I often use
it at about half revs at which speed it still generates enough to run
an old Milling machine, However It would be very nice it I could run
the diesel at this low speed and still get 50 c/s and the correct
voltages. It is skid mounted, bolted to the floor on a heavy chassis
but the engine and alt. are close coupled. I was toying with the idea
of separating them and hooking up a chain shaft drive behind the set to
gear the motor speed down by at least half.

This will be a big job I fear, as they are very close together and it
might be necessary to move the engine to the right a bit to enable
sprockets or even pulleys to be connected to gear down the alternator.
Has anyone ever done this and has anyone any simpler lateral solution.

Or - alternately does anyone wish to swap a noisy 40 Kw set for a nice
quiet 15- 20 Kw set ?

No help to you George but I am reminded of an ingenious set up used to
provide a range of speeds on a flat belt drive centre lathe.......a car
gearbox, directly driven from the motor, with a flat drive pulley
instead of the prop shaft drive:-)

Not used in a production environment of course!

--
Tim Lamb

On Friday, 29 December 2017 19:11:47 UTC, George wrote:
Evening all.

In my workshop I have a Lister 4 cylinder diesel, air cooled 3 phase Alternator I think it must only have two poles as to get 50 Hz it seems to run far too fast and makes far too much noise in so doing.

It is at least twice as powerful as I would ever need and I often use it at about half revs at which speed it still generates enough to run an old Milling machine, However It would be very nice it I could run the diesel at this low speed and still get 50 c/s and the correct voltages. It is skid mounted, bolted to the floor on a heavy chassis but the engine and alt. are close coupled. I was toying with the idea of separating them and hooking up a chain shaft drive behind the set to gear the motor speed down by at least half.

This will be a big job I fear, as they are very close together and it might be necessary to move the engine to the right a bit to enable sprockets or even pulleys to be connected to gear down the alternator. Has anyone ever done this and has anyone any simpler lateral solution.

Or - alternately does anyone wish to swap a noisy 40 Kw set for a nice quiet 15- 20 Kw set ?

How about sourcing a four pole alternator?

On Saturday, 30 December 2017 10:29:59 UTC, Tim Lamb wrote:
In message ,
George writes
Evening all.

In my workshop I have a Lister 4 cylinder diesel, air cooled 3 phase
Alternator I think it must only have two poles as to get 50 Hz it seems
to run far too fast and makes far too much noise in so doing.

It is at least twice as powerful as I would ever need and I often use
it at about half revs at which speed it still generates enough to run
an old Milling machine, However It would be very nice it I could run
the diesel at this low speed and still get 50 c/s and the correct
voltages. It is skid mounted, bolted to the floor on a heavy chassis
but the engine and alt. are close coupled. I was toying with the idea
of separating them and hooking up a chain shaft drive behind the set to
gear the motor speed down by at least half.

This will be a big job I fear, as they are very close together and it
might be necessary to move the engine to the right a bit to enable
sprockets or even pulleys to be connected to gear down the alternator.
Has anyone ever done this and has anyone any simpler lateral solution.

Or - alternately does anyone wish to swap a noisy 40 Kw set for a nice
quiet 15- 20 Kw set ?

No help to you George but I am reminded of an ingenious set up used to
provide a range of speeds on a flat belt drive centre lathe.......a car
gearbox, directly driven from the motor, with a flat drive pulley
instead of the prop shaft drive:-)

Not used in a production environment of course!

a car gearbox would need its output to the engine, input to alternator.

In article ,
George wrote:
Or - alternately does anyone wish to swap a noisy 40 Kw set for a nice
quiet 15- 20 Kw set ?

Quiet generators are rather costly things. ;-)

--
*The older you get, the better you realize you were.

Dave Plowman London SW
To e-mail, change noise into sound.