CHANGE 3phase to 'single phase 60Hz ...???
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CHANGE 3phase to 'single phase 60Hz ...???
Hi There! does anyone out there know of any way to operate a 3 phase tool on single phase? ie: Electric Hoist is 220/240 60Hz 3 Phase I want to operate on 220/240 60Hz 'single phase' I know there are phase inverters for sale but they are sooooooooo expensive! ANY IDEAS???? THANKS !
Re: CHANGE 3phase to 'single phase 60Hz ...???
I don't know the accepted way to do this, and not knowing the power rating of the motor, I can only give an approximate method. for a 1 HP motor, try connecting one side of the 220 line to phase A, connect the other side of the 220 line through a 200uF AC capacitor to phase B, and connect the same side of the 220 line through 27mH to phase C. If it runs backward, reverse connections to B & C. The inductor and capacitor have to handle 3 or more amps. Please let me know if this works!
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Re: CHANGE 3phase to 'single phase 60Hz ...???
Thanks Russ....what you say makes perfect sense to me...I'll give it a try the 1st of the week and for sure let you know the results..by the way the one lift is 1 1/3 hp. Have a great weekend! Mel !
Re: CHANGE 3phase to 'single phase 60Hz ...???
Shifting the phase angle 120 degrees forward and 120 degress behind is what has to occur. If you use passive components such as capacitors and inductors, you must still maintain rated voltage on the phantom phases within a few percent and the motor must rotate wihin about 5 percent of its synchronous speed to avoid overheating if it is loaded substantially. So, to achieve 120 degree phase shift, you will probably need RC and RL networks to achieve the shifts, plus some voltage boost on the two artificial phases to compensate for network losses. I'm guessing that its a 4 pole motor (most common), so its unloaded free-running speed should be 1800 RPM before gear train reduction.<p>You might want to check and see if the manufacturer makes a single phase motor replacement. It might be least costly in the long run.
Re: CHANGE 3phase to 'single phase 60Hz ...???
I note someone on ebay is auctioning off a couple of phase converters - last night the bidding was upto U$45.00 - retail U$1500.00<p>
bodgy
bodgy
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Re: CHANGE 3phase to 'single phase 60Hz ...???
Hello there,<p>Another idea would be to see if your power
company would be able to supply you with
three phase electric power. Im pretty sure
this is available at the power line on the pole.<p>It cant hurt to find out...<p>Good luck,
Al
company would be able to supply you with
three phase electric power. Im pretty sure
this is available at the power line on the pole.<p>It cant hurt to find out...<p>Good luck,
Al
LEDs vs Bulbs, LEDs are winning.
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i discussed dropping three phase from the pole to my shop , it comes with a hefty fee!
just an idea here, but:
Why not find a single phase reversible ac motor with the same housing standard as the 3 phase hoist motor (industrial motors typically use standard flanges, and are known by ASME standards such as 56C and others) , just remember that when you run a lower voltage , you will draw higher current and require larger wiring /relays etc.
just an idea here, but:
Why not find a single phase reversible ac motor with the same housing standard as the 3 phase hoist motor (industrial motors typically use standard flanges, and are known by ASME standards such as 56C and others) , just remember that when you run a lower voltage , you will draw higher current and require larger wiring /relays etc.
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About the only time an electric utility is willing to run 3-phase to your shop is if you are going to be using a LOT of power and the 3-phase line is already running by your property. It costs them three times as much to serve 3-phase as it does a single phase, but if you have a really heavy load, supplying you from a single phase could unblance their line enough that they'd rather serve up three.
Seems that the suggestion to swap out the motor with a single-phase unit (especially if it's 240v) is the more practical solution.
Dean
Seems that the suggestion to swap out the motor with a single-phase unit (especially if it's 240v) is the more practical solution.
Dean
Dean Huster, Electronics Curmudgeon
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).
R.I.P.
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).
R.I.P.
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