Running an aircon pump with winch motor. Wiring?

[mule75]

what about using a decent starter motor instead of a winch motor??

[ricky1970]

Ok before i go on does anyone know roughly the power needed to drive an a/c compressor? I'm guessing that a lot more power is needed to compress a/c gas due to the higher pressures.

What about if they use a compressor from a smaller vehicles a/c unit?

For a single stage PISTON AIR COMPRESSOR, it takes approx 1hp for every 3-4 cfm @ 120psi

[-Scott-]

Ok before i go on does anyone know roughly the power needed to drive an a/c compressor? I'm guessing that a lot more power is needed to compress a/c gas due to the higher pressures.

What about if they use a compressor from a smaller vehicles a/c unit?

For a single stage PISTON AIR COMPRESSOR, it takes approx 1hp for every 3-4 cfm @ 120psi

I can't be stuffed researching the physics - what happens at lower pressures, like inflating tyres from 20-40 psi?

[cooter]

we use a starter motor of an early ford as they are a straight front motor no bell nose and alloy pulley from cbc bearins with a v belt all fitts inside a milk crate will pump a 33 from 14 to 32 in 1 beer (30 seconds)

[bazzle]

This is an interesting project, so please keep us informed.

The load on the motor should change with the pressure being generated - for lower pressures, such as pumping up tyres, there shouldn't be as much load and the motor should have an easier life.

At higher pressures the compressor will be harder to drive and work the motor harder - which is where the worst problems will be.

bazzle - when you burnt out two motors, what pressure were you generating, and how fast was the motor running? DC motors generally don't like running slow - that's when they're most likely to overheat. At the same time, I wouldn't expect an AC compressor to generate much pressure at low speed, so I'm confused.

Tried to maintain 40 psi. Motor slowed down to about 800rpms (guess) before smoking. Used 2 2.5 hp off 10,000k winch.
Very large cables, direct drive adaptor nose to nose.

Bazzle

[superg]

Hey cooter do you have a picture of this setup? because i started to do the same thing but havent got around to finishing it off, did you use any relays or anything?