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how about a Oklahoma,AR,MO,KS,TX,+IA GTG thread?

plcnut

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It is easy to run a 3 phase motor on single phase as long as it is under 3 horsepower. We do it all the time using a VFD (Variable frequency drive). It takes your single phase power, converts it into DC and smooths it with a capacitor bank, and then uses IGBT's (or another type of solid state switch) to make a new 3 phase waveform. You can go over 3 horsepower, but they require derating, and only certain drives will allow you to do it. Here are the drives I normally use: https://www.automationdirect.com/ad...VAC_SLV)#Input_ms="230+VAC+1/3+Phase"&start=0
$250-350 isn't too bad for what they will do. You can also vary the motor speed if you wanted.
If you don't know what you are doing, then don't attempt to hook one of these up on your own! Also, don't try to use one without configuring it properly!
 

Dub11

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It is easy to run a 3 phase motor on single phase as long as it is under 3 horsepower. We do it all the time using a VFD (Variable frequency drive). It takes your single phase power, converts it into DC and smooths it with a capacitor bank, and then uses IGBT's (or another type of solid state switch) to make a new 3 phase waveform. You can go over 3 horsepower, but they require derating, and only certain drives will allow you to do it. Here are the drives I normally use: https://www.automationdirect.com/adc/Shopping/Catalog/Motor_Controls/Drives/DURApulse_-_GS3_(230_-z-_460_VAC_Sensorless_Vector_Control)/DURApulse_-_GS3_Drive_Units_(230_-z-_460_VAC_SLV)#Input_ms="230+VAC+1/3+Phase"&start=0
$250-350 isn't too bad for what they will do. You can also vary the motor speed if you wanted.
If you don't know what you are doing, then don't attempt to hook one of these up on your own! Also, don't try to use one without configuring it properly!
How much would you charge to hook something like that up? Theres a small lathe at work collecting dust.
 

sawnami

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A guy from our City Utilities that set up a site plan to run power to my shop said that you could set up a 3-phase motor as a generator to power 3-phase equipment. I didn't ask for details though.

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plcnut

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A guy from our City Utilities that set up a site plan to run power to my shop said that you could set up a 3-phase motor as a generator to power 3-phase equipment. I didn't ask for details though.

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That would be what is called a rotary phase converter.
It uses a 3 phase electric motor (Which is actually a rotary transformer), and uses capacitors to fake a third phase in order to get the motor started. Once this motor is started it idles (no load attached), and will generate power off the third leg. You can then run other 3 phase motors on the output. If properly sized, installed, and used, they work great.
 

Douglas Ostrander

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Morning everybody.
Got to use the 390 Saturday on the tree of death. 36 " bar, 404 semichisel and buried it. Pulled it with authority.

How do you like the 404 semichisel on a big bar? I am liking it better than full chisel 404. Makes smaller chips but spits out more chips. Thus faster IMO. I have been trying it on a 50" bar.
 
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