Engery consumption of 15HP motor - 1PH vs. 3 PH
Engery consumption of 15HP motor - 1PH vs. 3 PH
(OP)
Hello everyone, I'm a civil engineer who needs a little help. This may be a very dumb question, but here goes. If my client has his choice between a 1PH or 3PH motor, both 15HP which would run the exact same piece of equipment, is there a "better" choice as far as which motor would cost more for energy consumption.
Thanks for the help!
Thanks for the help!





RE: Engery consumption of 15HP motor - 1PH vs. 3 PH
I have a couple other tips that might help you:
If energy consumption is a primary criteria then you'll want to evaluate a high-efficiency motor.
Consider comparing total cost of ownership, not just energy consumption. Most 15HP 1PH motor designs include start switches and capacitors that will cause more downtime and cost more to maintain than 15HP 3PH motor designs.
-Sean
RE: Engery consumption of 15HP motor - 1PH vs. 3 PH
If they only have 208V 3 phase, then the cable cost difference will be negligible, but the efficiency may be worse, because if you can even find a 15HP 1 phase motor (they are not common), they will typically be designed for 230V and ACCEPTABLE to run on 208V, but the efficiency will be less than at 230V..
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
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RE: Engery consumption of 15HP motor - 1PH vs. 3 PH
Keith Cress
kcress - http://www.flaminsystems.com
RE: Engery consumption of 15HP motor - 1PH vs. 3 PH
If your supply is 120:208 Volts, you will want a 200 Volt rated motor in North America.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Engery consumption of 15HP motor - 1PH vs. 3 PH
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Engery consumption of 15HP motor - 1PH vs. 3 PH
It will hit the power system like a Hefty Bag filled with lasagna hits the pavement after a hundred floor drop.
I have a 5HP TEFC running a compressor. It's relatively new and it's gigantic.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Engery consumption of 15HP motor - 1PH vs. 3 PH
Incidentially, ignoring all losses, 15 Hp. = 11.19 kW.
It doesn't matter, 1-Ph, 3-Ph, or DC.
3-Ph will be easier to install,maintain, and is more rugged for an industrial environment.
Ed
RE: Engery consumption of 15HP motor - 1PH vs. 3 PH
Having said that, 3-ph motors are preferred at that HP.
Muthu
www.edison.co.in
RE: Engery consumption of 15HP motor - 1PH vs. 3 PH
Love the imagery... but why put lasagna in a hefty bag?
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies