In about 1959 or '61, (don't remember the exact year, but I was in 2nd or 3rd grade, and I graduated H.S. on '70.) my Dad bought a reman Quincy, 2 stage, 60 or 80 gal, 5 hp, and it was still running when the motor burned up a couple of years ago. Unfortunately it is still sitting there waiting for a new motor, because 5 hp single phase motors don't come cheap, and as long as my 1 hp 30 gal compressor is keeping up with about 90% of what I ask of it, it is difficult to justify the expense,
Dave
You can probably have the motor rewound for way less than the cost of a new one.Originally Posted by dclaxon
Yea, we did this all the time when I was a maintenance engineer. Way cheaper than buying a new one. Most places that sell electric motors for industrial use can rewind them (or send them out to be done).
For what it's worth, I've found Tractor Supply to be the best place for compressors and other air related things around here.
One thing I have figured out, I am probably going to have to do some electrical work if I upgrade. I currently have a 220V 30 amp breaker feeding 10 ga stranded wire running approx 70 feet in EMT. The current 5 HP motor says it pulls 13.8 amps. Anything I am looking at pulls between 22 - 28 amps for a 5 HP compressor. I figure I will split the 2 hot wires I have now to make 2 30 amp 110 circuits & have to put in a new 220 circuit with 6 or 8 ga wire on a 40 or 50 amp breaker if I upgrade. Wouldn't be a big deal except my shop is so full of crap & unfinished projects I will have to empty it out to run a new circuit. I have a bad knee I don't like ladders.
If those are full load amps, it is too big a difference to be based on motor efficiency. Almost looks like a three phase verses a single phase motor.
BJC
The 13 amp one sounds like some of those "Magical Mystery Motors" from years ago that claimed horsepower ratings greater than known electrical norms... Like the shop vacs getting 6 hp from a 110/20 amp circuit....
Note, you can not put 15 or 20A recetpacles on this repurposed circuit unless you also drop the breaker down to 20A. Also note that if this is a garage or an accessory structure at or below grade 110 15 or 20A receaptcles require GFCI protection. If you want to use this MWBC (i.e.,shared neutral) you're going to have to be careful how you do your GFCI protection. Either use a 2 pole (with load neutral) GFCI in the panel or GFCI receptacles at each point where the neutral is still shared (you can't have one neutral connected to the protected side of multiple GFCIs.).
I tried that already, the shop said it was too toasted to repair. The problem was that they could also not get me another motor like it any more, it was a 5 hp motor built on the frame for a 7.5 hp. The options were to get a 5 hp on a different frame, and change the mounts and the pulley, or get a 7.5 on the same frame. But I don't think the electric service to the property would handle the bigger motor, the whole house would dim momentarily whenever the old one kicked in. And as I recall, when Dad bought it back in the day, he had to have the service upgraded to the airport where his shop was.
Dave
Get quotes from some re-wind companies, you might get lucky. I got a re-wind quote that was higher than the cost of a new motor from Leeson. Air comressors put a heavy start-up load on motors and cheap motors may not survive that duty.
Jerry
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