View Full Version : An electric motor question?
01-11-2005, 07:07 PM
Whats the most powerful 1 phase motore available?
01-11-2005, 07:15 PM
7.5hp, so they say. Close to 30 Amp at 220v.
01-11-2005, 07:16 PM
Got a 30 Hp one here.
01-11-2005, 08:22 PM
That depends on the type. If your referring to a standard Axial thrust, wye-delta starting, double air gap induction motor with Permanent magnet synchronous double windings the maximum Hp/torque would be developed with a low amp zero slip triple laminate which would be around 4.69 hp @ 1740 rpm. However the more common hysteresis synchronus polyphase form wound case hardened, full wound motor with an inverted V armature would produce a higher ratio of Real Power-KW to total KVA or the ratio of actual power (watts) to apparent power (volt-amperes) which would be 14 hp.
Hope this helps...
Hoffman in Warner Robins Ga
01-11-2005, 09:07 PM
Weg and I believe Leeson make 10 and 15hp 1800 rpm single phase units.
The 10 is $685.00 and the 15 is $1390.00 USD last time I looked.We have one customer that uses the big single phase motors becasue he cannot afford $22,000 for 3phase power installation.
BTW,his electric bill is very high.
01-11-2005, 09:39 PM
I'll stick with my "small time" motors. I must have been looking in the hobby section. http://bbs.homeshopmachinist.net//biggrin.gif
01-11-2005, 09:46 PM
But then again why?
You can run 40hp three phase off a 200amp single phase service with just a contactor and a smaller single phase motor to spin it up before switching the power on.
I have personally built a 20hp converter and I have heard of 100hp units being manufactured.
01-13-2005, 06:12 PM
Why? well ive seen some nice cnc lathes that i can get in my basement (some with live tooling even!) but they run on 7, 10, 15 hp motors, i guess if i put a 3 hp on it i would be an idiot http://bbs.homeshopmachinist.net//redface.gif , anyones let me rephrase my question, whats the biggest 1 phase motor on 110v, and what is the biggest motor (110v or 220v) that i can run on house current?
01-13-2005, 08:40 PM
On 110vac? 2hp,thats about tops.220vac,5,7-1/2 and 10(assuming a dedicated 220 circut and breaker)
01-13-2005, 09:29 PM
<font face="Verdana, Arial" size="2">Originally posted by Elninio:
Whats the most powerful 1 phase motore available?</font>
I bought it from grainger to use with the four piston air compressor in the background. The motor is brand new waiting to be put into service. The soda can is for size reference. JRouche
[This message has been edited by JRouche (edited 01-13-2005).]
01-13-2005, 10:08 PM
Actually we might be wrong-
I don't think so. Have an article in a water industial mag a farmer is running about 100 hp on single phase on his well. Three phase would run about $11,000 a mile cheaper to buy the motor than run wire. I'll find the article and double check it.
01-14-2005, 08:18 AM
<font face="Verdana, Arial" size="2">Originally posted by wierdscience:
Actually we might be wrong-
Oh? I thought he was askin which one was available, you know, sitting on the floor of your shop and available http://bbs.homeshopmachinist.net//biggrin.gif http://bbs.homeshopmachinist.net//biggrin.gif http://bbs.homeshopmachinist.net//biggrin.gif
01-14-2005, 11:24 AM
If you have the space and the scratch to afford a CNC machine; why not pony up a little more scratch for a variable frequency drive for the 3 phase motor? http://bbs.homeshopmachinist.net//confused.gif I can't speak from experience; but, form what I have read these black boxes sound like the hot setup.
01-14-2005, 11:51 AM
Why would you need a motor this powerful. Big motors belong on big lathes that will be way over your budget.
03-13-2005, 09:53 PM
just curious, besides even if theyr 1 phase, their still like 40 amps
03-13-2005, 10:40 PM
Generally speaking, 10 amps per HP on 110 volts, 5 amps per HP on 220 volts.
Typical 110 volt circuit can barely handle a 2 HP motor because the starting load is briefly 30 to 40 amps.
03-14-2005, 01:53 AM
Hoffman I could kiss you but I'll settle for owing you a bear when you get out this way. El, putting a three hp on it isn't what makes you an...oh, nevermind.
03-14-2005, 03:01 AM
<font face="Verdana, Arial" size="2">Originally posted by Dave Opincarne:
. El, putting a three hp on it isn't what makes you an...oh, nevermind.</font>
Perhaps a case of .........
"Just look at the size of my ding-a-ling" http://bbs.homeshopmachinist.net//biggrin.gif http://bbs.homeshopmachinist.net//biggrin.gif
03-14-2005, 10:45 AM
wouldn't it be easier, and maybe cheaper to just use a gasoline or small diesel engine for that compressor? i'm being serious, i don't really see the advantage to the huge electric motor unless it is cycling on and off all the time. i guess if you are the ultimate scrounger and got the parts for free, then it would be a different story.
03-14-2005, 02:00 PM
Jrouche-out of interest - whatis that air compressor- is ita champion pneumatic by any chance?
I am fixing up an old champion air compressorand am going to run it with a diesel,need a few parts.