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Tool Talk Discussion Forum

3 Phase Air Comp

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FarmerDave

03-09-2005 10:07:58




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Is a 3 phase air compressor typically powered with 3 wires and an equipment grounding conductor? Is the ordering of the three hot wires critical?




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dr.sportster

03-09-2005 12:21:15




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 Re: 3 Phase Air Comp in reply to FarmerDave, 03-09-2005 10:07:58  
If you dont have a three phase service you will need a phase converter.



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buickanddeere

03-09-2005 10:46:14




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 Re: 3 Phase Air Comp in reply to FarmerDave, 03-09-2005 10:07:58  
Swap any two of the three lines and the motor rotation direction changes. Important if the load can be ruined by turning backwards. A good electrical contractor can test both the motor and the incomming lines and never make a rotation direction mistake.



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Jay87T

03-09-2005 10:21:32




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 Re: 3 Phase Air Comp in reply to FarmerDave, 03-09-2005 10:07:58  
I too would like to learn about 3 phase motors, any links about these motors? and what makes them better?



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Bob

03-09-2005 11:13:02




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 Re: 3 Phase Air Comp in reply to Jay87T, 03-09-2005 10:21:32  
One advantage to three-phase motors is that NO internal start switches or start capacitors are needed, making the motor more reliable over time, and a little less costly to make.

Another advantage is that supply wires to the motor can be smaller, however, that is about a wash, since three supply wires are needed instead of just two (larger) wires.

Another advantage for three-phase is that the motors are instantly reversable. That is a good feature for use on certain industrial machines and machine tools.

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FarmerDave

03-09-2005 10:36:24




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 Re: 3 Phase Air Comp in reply to Jay87T, 03-09-2005 10:21:32  
It's more efficient to provide electricity through three phase than single phase. IIRC 6 phase would be better yet but then you start getting too many wires. So as a compramise the industry settled on 3 phase. It models like three sources 120 degrees out of phase from each other.

3 phase comes in two variants delta and wye. If I remember correctly the delta is a three wire wire system with no neutral. The wye is a four wire system. Some diagrams would help you.

Google searching 3 phase motor returns a lot of hits.

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