3 phase compressor
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Fleet Owner
Joined: May 2009
Posts: 21,437
Likes: 75
From: Gilbert, PA
yeah right. Lets see. I have a free Brand new 10 hp and it will make 35 CFM or i have to go buy a 15hp motor(at least $800) and still make 35 CFM. I think i will stick w the free 10hp one and still not use all the air this compressor will make
Lead Driver
Joined: Jul 2007
Posts: 7,868
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From: Rhode Island
According to the Quincy site, the real 15 HP QT15 has a physically larger displacement pump and spins the pump 300 rpm faster. Sticking a 15HP motor on his pump would get him nothing - as he already figured out.
Postmaster
Joined: Aug 2004
Posts: 4,004
Likes: 1
From: North of Boston MA
So, assuming 220 volts for this application (assuming 1.0 PF):
3-Phase: 25*220*1.73 = 9515
Single Phase: 44*220 = 9680
In other words, 10 horses is 10 horses. The efficiency of an electric motor of any size is pretty high. For something run infrequently, there really isn't any need to go crazy adding three-phase or trying to convert single- to three-phase. Run the single-phase 10 HP motor and you will be money ahead from the word go.
JMO of course.
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
Wait, are you saying the "single phase" motor is rated for 208-230 AND 460? Those are 3-Phase voltages, not Single Phase.
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Fleet Owner
Joined: May 2009
Posts: 21,437
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From: Gilbert, PA
It is a single phase, says so on 2 differnt spots on the motor
But i am wondering what else i have to change on the compressor for the single phase motor to work? Do i have to change the magnetic contacts in the control box?
But i am wondering what else i have to change on the compressor for the single phase motor to work? Do i have to change the magnetic contacts in the control box?
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
I think you just use two legs of the contact instead of all three, and keep the neutral connected at all times, unless it's a four contact mag switch, then you wire the two hots and neutral, just skip the third hot.
It's a good thing you're not trying to run that size motor through the pressure switch. That's just asking for a fire.
It's a good thing you're not trying to run that size motor through the pressure switch. That's just asking for a fire.
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