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I have this air compresser that was give to me. It seems to be in pretty good shape. The only problem is that it is 3 phase. I am new to this so from the pictures it looks like I have a magnetic start switch, a disconect, and what I believe to be the pressure switch to start the compressor. I have looked at rotary phase converters but they seem to be a little rich for my blood. I looked at some motors and found some single phase ones for around $200. They are of the 3800 rpm range. The current one on there is in the 1700 range. I wasn't sure if I could swap them out and adjust the rpm with the pulley size. I also can't find any literature to tell me what rpm the pump needs to turn at. My other concern is would I be able to use the pressure switch, disconnect, and the magnetic start switch that I currently have. I am not well versed in all this so any help would be appreciated.
 

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Yes you should be able to use the disconnect and contactor for single phase,, Just make sure you use the same two lugs on all connections. Pressure switch shouldn't matter I don't think. You would be better off using the correct RPM motor than trying to get a 3800 rpm down to speed.
 

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While it would be preferable to replace the current 1800rpm motor with another of the same speed, you could, in a pinch substitute a 3600 rpm motor, but you would need a pulley 1/2 the diameter of the original. Depending on shaft size, and how big the original pulley was that may or may not be possible. You'll need a shorter belt too.

You should be able to find a single phase motor in 1800 rpm, they're the most common speed for most applications, though they are nominally more expensive than 3600's.

I have gotten a few good motors off ebay from time to time, or if you want a warranty (without spending top dollar) try Automation Direct. They're mostly foreign made motors, but I've used them before and have no complaints
 
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