Need a single phase 220 motor, what hp & rpm do I need

by Scott Robinson
(Tullahoma, Tn, USA)

My compressor is a ingersoll rand it is type 30 size is 2.5x2.5x2.75 can't read model I would like to know what hp & rpm motor I need to run this compressor properly

Comments for Need a single phase 220 motor, what hp & rpm do I need

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Feb 28, 2017
Pulley size on motor,motor hp,rpm
by: Anonymousbob lind

Start with pump rpms around 750 -850. measure compressor pump pulley .15".a single phase 5-7.5 hp 1ph.should be good 7/8"- 1 1/8" shaft should be good.pick a high amp motor like 20amp.compressor duty not lower like 15amp compressor duty .to size the pulley on motor is important. Comp pulley dia 15" x 750 pump rpm.=11250. 11250 รท motor speed 3450 or 1725 = motor pulley size.

Based on IR T 30 SWAP FROM 3 HP 3PH TO 5HP 1PH 3450RPM .ANSWER IS 3" pulley for 3450 rpm

Jan 29, 2016
No motor
by: Scott Robinson

It is just missing the motor and original motor plate, we put a motor with low rpm on it my neighbor had 1 1/2 hp with a very small pulley just to check the compressor out put a 125 psi cut out switch took about 20 min to build up to 125 psi and cut off sounds real good and smooth.

Changed the oil it looked good.

It came out of a mechanics shop and set out side for about 10 years.

No oil leaks and held the 125 psi for days.

Just wanted to put the proper motor & rpm so it would possibly last me for awhile.Thanks again

Jan 29, 2016
by: Scott Robinson

It does not have the motor plate it came with it come with a alum. plate someone made. Thanks for trying to help. I'll start with %hp low rpm and go from there can always use different pulley size until it seems to work it looks old so I don't want to overwork it.
Thanks Again

Jan 28, 2016
by: Doug in

Is this a pump only? Or just a missing motor?

Anyway, I'm gonna have to suggest going to IR and see if they can help, although if you can get a pic or two of it, someone may recognize it.

Sorry. Good luck.

Jan 28, 2016
Motor for type 30
by: Scott Robinson

Here is what is on the plate on the compressor
TYPE. 30
SIZE. 2 1/2 x 2 1/2 x 2 3/4
MODEL. is blank nothing
SERIAL NO. 30T. 36475
No motor plate
The compressor turns good and smooth just wandering what motor I need I got a motor plate that will work with different mounting holes but it did not come with the compressor.

Jan 28, 2016
What motor?
by: Doug in

No telling with that info.

Different models run on from a horse up to at least 15HP. And the RPM varies depending on HP.

What are the dimensions you gave of, and what units?

Is there a motor mount plate? The old motor footprint may give a clue as to what you need.

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