You need to find out from Bauer at what speed the compressor itself should
turn. Chances are, you are turning the compressor at around 1250, but there
is a smaller pulley on the motor. A gasoline motor for a high load,
continuous-duty applications like this will typically be set up to run at
around 3000 rpm. Of course you can change a gasoline motor's speed by
changing the throttle. You probably don't want to run a gas motor at much
more than 4000 rpm, because it makes a lot of noise, introduces cooling
problems, and generally shortens the engine's lifespan. An electric motor in
the US, where we have 60 Hz power, will run at about 1725 RPM. In Europe and
other places that have 50 Hz power, the speed will be about 1450 RPM. You
can't change these speeds easily. So you need to select the motor's pulley
size so that the compressor shaft speed is correct. The specification for
the particular Bauer model you have will probably tell you the electric
motor HP for various compressor shaft speeds. I wasn't able to find the
information at www.bauercomp.com, but your local dealer/distributor should
be able to help you.

If you are running an 8HP gas motor, you probably need about a 5 HP electric
motor, and you would put a pulley on it that is about twice the size of the
one on the gas motor. Then, run the compressor under little or no load and
check the compressor shaft speed. Make sure that it is not over the Bauer
spec for that model. Then run the compressor at full load and check the
motor current draw. Make sure the actual amps drawn are not higher than the
dataplate rated amps. If you are underspec on both current and compressor
shaft speed, you can increase the motor pulley size a little and run the
compressor faster.

I hope this helps.

-Randy




-----Original Message-----
From: Vuong, Huu-Nghia [mailto:Huu-Nghia.Vuong@ac*.co*]
Sent: Monday, June 24, 2002 12:46 PM
To: 'Randy Bohrer'; Techdiver
Subject: RE: Portable compressor and generator


This list has so many knowledgeable people, I am going
to shoot my question too.

If you have a compressor running on a gas engine (8 HP), What
would be your advices to change the engine to an electrical one ?

I want to be able to have the possibility to use both and it's
a Mariner II from Bauer, meaning it's running at very low RPM
(like 1250 RPM ...).

I didn't find an electrical engine which was meeting these specs
( I assumed I had to use a 8HP electrical engine running at 1250 RPM ...)

Kiki

--
Huu-Nghia VUONG a.k.a. Kiki   Design and Performance Infrastructure
Actel Corporation             Timing and Power Products
955 East Arques Avenue        e-mail : kiki@ac*.co*
Sunnyvale, CA 94086           voice  : (408) 522 4382
USA                           fax    : (408) 516 9894




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