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Tool Talk Discussion Forum

Air Compressor pump/motor pulley size

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Larry in Tn

02-17-2004 04:18:00

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Sometime back someone posted the methods to calculate pulley sizes for compressor/motor combinations. I can't seem to find it.
HELP!!!!!
Larry

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John in MA

02-17-2004 09:10:19

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Re: Air Compressor pump/motor pulley size in reply to Larry in Tn, 02-17-2004 04:18:00

There's no fancy method. The relation of size of the pullies to speed is direct. Like a compressor with an 8" flywheel will turn half the speed when driven by a motor with a 4" pully.

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Mark

02-17-2004 09:37:32

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Re: Re: Air Compressor pump/motor pulley size in reply to John in MA, 02-17-2004 09:10:19

Pulley rotational relationship is circumference of one to circumference of the other.

C = pi (3.14) x diameter of pulley

Don't know what you are doing but you have to have refrigeration/ac systems balanced for their capacity. There has to be a certain amount of air across both coils (evap and cond) for the amount of refrigerant flowing thru the system for a given cooling capacity and heat load.

Screw up the balance and you will either freeze up your evaporator coil or blow-up/burn-up your pipes/compressor from too much head pressure if you don't push the heat out of the ref.

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Terry G

02-17-2004 08:48:42

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Re: Air Compressor pump/motor pulley size in reply to Larry in Tn, 02-17-2004 04:18:00

These should work.

A = Motor RPM
B = Compressor RPM
C = Motor Pulley Diameter
D = Compressor Pulley Diameter

B=C/D*A
A=D/C*B
C=B/A*D
D=A/B*C

Terry G

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02-17-2004 10:47:21

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Re: Re: Air Compressor pump/motor pulley size in reply to Terry G, 02-17-2004 08:48:42

Don't you have to take the dsplacement of the compressor into account so that you don't overload the motor?

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Larry in Tn

02-17-2004 13:55:34

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Re: Re: Re: Air Compressor pump/motor pulley size in reply to mj, 02-17-2004 10:47:21

I agree that some allowance has to be made for current pull in an electric motor so as not to overheat/overload the motor.
The info sent by Terry G should cover most any application. I enjoy playing with old compressors and have a pretty good collection of odd's and end's. I've been lately fooling with an old A/C compressor that someone fitted to an old 40 gallon air tank using an old Westinghouse wound rotor induction motor for power. A real classic???
Biggest problem with the old A/C compressors is that they pass some oil with the air. This old unit is unlabeled except for the number 19 cast into the head and one side of the crankcase. It is a standard two cylinder configuration not the round pump/motor combo type. Any idea's on how to filter the oil out of the air???
I recently picked up a York automotive compressor that is supposed convert to a dandy air pumper. Has anyone done the York conversion???
Larry

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Terry G

02-17-2004 13:22:22

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Re: Re: Re: Air Compressor pump/motor pulley size in reply to mj, 02-17-2004 10:47:21

Yes, the motor must have enough horse power. The above formulas are only for speed and pulley diameter.

Terry G

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Mark

02-18-2004 10:16:50

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Re: Re: Re: Re: Air Compressor pump/motor pulley s in reply to Terry G, 02-17-2004 13:22:22

The motor size (HP) is calculated using several terms like tons of air to be moved, total BTU's in those tons (how many square feet of air do you want to change how many degrees and what are the loss factors), conversion from BTU's to HP(in steps your compressor with it's losses to be added in), HP to watts, watts to line VA (in steps your electrical service requirements) and all.

It's kinda fun as a hobby if you like that sort of thing.

Mark

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