3 HP Rotary Screw Project #2

Installing a non OEM drive motor

[@phuzzz1]

Hi Dave, looks like you're well on the way to getting this unit going, looking forward to the next part, I don't know much at all about the rotary type compressors, I guess it is much more efficient than the conventional? If you should need small bushings, pulleys, and or adapters machined/broached, etc., I'd be glad to help, as I appreciate your technical support in helping walk me through repairs on my old stuff, I say small only because the shipping would probably make larger heavier items impractical. Mike

[@rotarycomptech]

Hey Mike thanks for the comment! The single stage rotary screw compressors are slightly less efficient than a recip w/ good valves. The real benefits are 100%duty cycle. I totally forgot about you had to go to your channel then saw your Quincy video and it all came back to me I think that was your 1st Y/T video Thanks for the offer to do some machining work will definitely keep you in mind your channel has some cool videos returned a late favor.. Talk to you later:)

[@phuzzz1]

Ha, right you are Dave, that was the first video I ever did, and I used my phone, the whole thing started as a joke, a friend was going to scrap that Quincy as junk, I said what are you nuts???? I'll have that thing running in a couple hours, and so it went, the video was just used as proof, and so it goes, I think you were the first person to respond, and you are THE compressor guy, with helpful info, and positive comments, I really appreciated the that and the guys who gave me the Quincy thought it was cool and I should continue, and so, here I am...... Thanks again, Catch ya later!

[@luigithebaker]

i like the project. good job so far. doog thinking using longer threaded rod to hold the motor to the case. Cant wait or the next vid.

[@sivalley]

Motor rating plate says at the bottom right: "CCW D.E.". That would be "CounterClockWise Drive. End."

[@slamdvw]

I like it!

[@hardcooling]

Nice unit .. Man id take the thing any day ... How you dave

[@nicholassmerk]

You paid a bit for a Chinese motor. I hope it works out for you. That's a nice compressor unit.

[@rotarycomptech]

Try to find one cheaper, there more expensive than you think...And the compressor isn't that nice it's all riveted together sheet metal

[@nicholassmerk]

It's nicer than the used $100 craftsman (devilbiss) that I have. I got a used 3hp motor the other day on the cheep. Gotta snag stuff like that when you find it second hand.

[@alisnaluma2748]

Super 👏🏽✌🏽

[@stevev3142]

I don't see any way this will work, the single phase will not live long due to the stress placed on it. Hope it does but I don't think so.....

[@rotarycomptech]

It runs @ name plate amps what stress are you referring to?

[@stevev3142]

The original motor was a heavy duty 3 phase motor and had much heavier bearings than the single phase motor you replaced it with. Most compressors have a service factor of least 1.1 to 1.5 due to the severe load factor they endure. The single phase motor also appears to have a start run switch in the motor and that most likely will be a problem down the road due to the start stop operation of the compressor unless you get the thing to modulate. Seems it may have been easier to buy a small inverter and oversize it by a factor of about 2 times and it would have created the 3rd phase that would have powered the original motor by using a single phase input (or batter yet just run it on the original voltage and get a VFD that would run the unit). By using the VFD you could have made the drive varies the air end speed / set point (if the drive had an onboard controller and allowed you to installed a pressure transducer). Most of the better drives now have this capability. There are several ways you could have done this….. I saw where you got it to run so I was wondering if it is working OK now?