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Single phase to 3 phase the simple way
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- Опубліковано 23 кві 2012
- An explanation of the use of a single phase power source to operate one 3 phase motor to produce 3 phase power for another. By using a pilot motor to rotate a 3 phase motor then applying single phase power to the motor, 3 phase power will be produced to operate the 3 phase motor on your equipment. This the simplest and best way to operate 3 phase equipment on single phase. 3 phase motors are often available for a fairly low price due to their limited applications. A wiring schematic is included
This video is part of the heating and cooling series of training videos made to accompany my websites: www.graycoolingman.com and www.grayfurnaceman.com to pass on what I have learned in many years of service and repair. If you have suggestions or comments they are welcome.
If you are a homeowner looking to repair your own appliance, understand that the voltages can be lethal, the fuels are highly flammable and high pressures are used. Know your limits.
Good old school tech. Well done.
Handy for homeowners since 3 phase power isn't common to residential areas.
Old video, but comments bump up videos!
Awesome video and project,one of those"why didn't I think of that" moments.
I’m building a converter now. I’m using a giant 10 hp electric motor I salvaged out of an old industrial Varian Vacuum pump. For my starter motor I’m using a large DC motor and speed controller salvaged out of an optical polishing machine. I also salvaged all of the switches, capacitors and breakers and relays from machinery that my company scrapped out due to age. I used such a big motor so i can drive multiple pieces of machinery in my shop. I’m going to run the output of my converter into a small sub panel in my shop which will then be hooked to all of my machines. I cant wait for it to be done. Been a lot of fun getting all of these different components to come together as a whole new machine.
My father got himself 3 phase in his garage including a transformer to get from 208V to 600V. All for less than 3k while Hydro wanted 60k to bring it in.
Canada.....🤦♂️smh
I really preciate you taking the time to create this very informative video!!! I know that a fairly large number of creators try to exhibit their higher learning techniques & abilities, Whe in actuality it's usually nutt'n more than fluff to fill the creator's short orchestrated dance hall production!!! Thanks again, Joe C.
Ive seen/heard of this a few times. For people not too savvy with electric motors I highly suggest buying a phase converter, pretty much does the same thing but can be professionally installed.
Actually, phase converters simply use a capacitor to energize the 3d winding in order to start the motor. Then the the 3d winding drops out when the motor starts. The motor runs on 2 windings.
When you use the 2 motor system, the 3d winding is energized. What this means is the motor operation is balanced and the amp draw is spread between 3 windings instead of 2. Its a better way.
GFM
Brother, that is too cool. I can not thank you enough for what you are doing.
KEEP UP THE GREAT WORK....
Thanks for the support.
GFM
Another excellent video! Years ago before you tube and online sources, I thought you had to purchase an expensive phase converter to be able to do exactly this. I passed up a nice 3ph compressor for cheap years ago that this setup probably would have run. Thanks for taking the time to make this and all your fantastic videos!
Good job, it took me a few minutes to understand what you were doing, At first I did not understand why you did not include the wiring of the separate starter motor, but then I realized that including it would have been more confusing. Nice job as usual.
AAHH ! ME TOO ! 💡✔
I take it that switching the direction of the driven motor direction is as usual change any two wires with connections with a switch? Thanks for the money-saving tip! Again!
Yes. The application shown has a reversing switch that works normally.
GFM
True, however, the cut off switch is very accessible. Good point though. Thanks for the comment.
GFM
The 2 most common voltages in the US are 240 and 460v. I will be doing vids on 3 phase as I get equipment.
Thanks for the support.
GFM
Just got mine built & tested today. Works great!
Glad you got it.
GFM
That works by using a capacitor to the 3d winding, thus using the 3d winding as a start winding. When the motor starts, the winding is dropped out. The only time I ever tried that, i think the backfeed from the controlled motor blew out the capacitor. Not really sure why. This system is used because it is simple and pretty much bullet proof. Thanks for the comment.
GFM
Each line is 120v to gnd. Between the 2 is 120X2 or 240. I will be doing a vid on power panel design when I get a chance. Hope this helps.
GFM
I have a friend that repairs welder. He tells me that this will work ok if you don't use the generated phase on the control circuits. The voltage in this phase will not be high enough to operate the controls. Hope this helps.
GFM
The described method of converting single to 3 phase is a rotary phase converter. There are converters that use one of the 3 phase windings as a start winding and use a start cap to start the motor. Then it runs mostly on single phase.
Fine, if you don't need a neutral. Or, if you don't mind a neutral that isn't anywhere near neutral. Older machines tend to need a neutral. They have old, weak insulation. I use a single phase motor to start too. And to start my 3 phase motor I connect to 2 legs. 1 live and the other neutral. But when it's up to speed, I take the neutral from the second leg and connect it to the neutral on the motor. (the star point) I then have 2 generated legs and a solid neutral. I hope this helps you. I wish you well.
I worked in a shop with 3 phase for 15 years. When we lost a leg, say a fuse went out , sometimes we left the motor run until we got the replacement. But if you shut it off then you all know that you can't restart it. 50 years in the trade and sill learning.
You could do that but the motor will have to run all the amps through the 2 working phases and if it is close to full load, it may trip the overload.
GFM
grayfurnaceman You are correct. Now that I think about it what I was talking about was say a conveyor with 5 or 6 motors, If we lost a phase the conveyor would keep running. Joe
OK. Phase converters that I have seen are not converters but start capacitors with a start relay. The motors done this way that I have seen are actually running on 1 phase. This system uses the 3d winding and has "fairly" even amperage.The motor used here cost $20. That's because used 3 phase motors are cheap. The start motor is from an old furnace, picked up for nothing. If you don't like my "dangerous" belt arrangement, use a coupler. This is a simple, cheap and effective 3 phase.
GFM
give me your em, i'll send pics and explanation.
@@possumdan1 Grayfurnaceman@gmail.com Thanks
GFM
361,000 views and only 624 likes?! Ungrateful folks out there. Thanks for the content. I like to be the tech who knows what im doing. When i tell people about this method, they are blown away by how simple it is. Hope youre having a good weekend!
Ryan Malin .. True facts! I never would have thought of this myself. Clever
The way I look at it, "run what you brung" Thanks for the comment
GFM
Beautifully done video,, Solved my problem,, Thanks,, I redrew your picture for you
+ECO SHAH Welcome
GFM
+ECO SHAH can you send on to me your wiring drawing cheers
+steve bird man The diagrams are in the video.
GFM
Help. How can I connect single phase power source to 3phase 380v motor 2.2kw
You will need a 3 phase motor of approximately one and one half times the hp of the motor you want to drive. A 1/4 to 1/2 hp start motor to start the larger motor. Belt and pulleys to drive the start the motor.
Late to this topic. I built mine with a time delay relay and motor start capacitor which is common in motor start circuits. The ship write starts his idler motor with a rope and pulley. If I need to build another converter I would use this method as you can easiley start a larger housepower idler motor.-Jay
That also works. This is just a little simpler.
GFM
I see I worded my comment unclear. I meant the method you show is the way I would go if I have to build another. The rope and pulley is a little to hands on. There should still be used 3 phase motors out there to use as idlers. I think that commercial built converters might have capacitors to correct for stray reactive / inductive loads. But that would not be noticed unless the converter causes line problems bothering neighbors. --Jay -- You know I think any 3 phase machine running in parallel if light loaded would act as an idler. that might be what the guy below is talking about.
Can you make comparison between this rotary converter versus modern 3 phase VFD. What are VFD limits, would it run your lathe just as smooth?
Great data good presentation!
What I'm thinking of doing is buying a cheap Harbor freight gas motor, machining a connector that connects the spinning shaft of the gas motor to a 3 phase motors shaft, and running the power from the 3 phase motor that is being generated to a welder that only operates on 3 phase. Basically, I'm just making a welder/generator combo, but I'm not sure if I'm missing anything. Thoughts?
Hi there from Mr Nick Wiese: I really appreciate your efforts here on 3 phase, It might help others to understand if we called our house power what it really is in the USA, it is called single Phase(1 hot leg) & single Phase 220(2 hot legs) it is actually (double phase) and you are adding one more Positive leg for 3 Phase, they all should add up to 360 volts in a house system of 200 amps or 400 amps. if the 3rd leg is off a bit so what?, as the motors magnets do not care! of course there is Delta or WYE motor wiring to be considered, Thanks again Mr. Wiese
Nick Wiese ummm....it depends on the windings in the motor too mr. DUMBASS
I dont know if you can get a big enough run cap to start the motor. And yes a start cap must be pulled off after about a second. But again simple is what we are trying to do.
GFM
could I run a 3 phase 2hp motor 220 volts horizontal bandsaw that has a smaller 0.5 horse water pump that turns on with a switch?
So simple its genius. That's what makes it genius.
Where's the neutral?
great setup these osha safety forman wanna be's would crap if they seen mine. my starter motor is on a hing with a lever to pull the starter back to tighten the belt and once the motor takes off push the lever forward the belt jumps offand ur good to go haha
Would it also be possible to have the 15hp 415v motor and 240v starter motor set up remotely with a female 3 phase plug connected to the 15hp 415 v motor so that multiple 3 phase machines could be plugged into the female plug (at different times of course) instead of having the set up hard wired to only one 3 phase machine? Thankyou
You could certainly do that. Probably the simplest would be a mechanism that loosens the drive belt, but go for it.
GFM
I owe to you man thank you very much!!!
I have a friend that repairs welders and I asked him. They will work. I would not guarantee perfect operation. If you can wire it so the third phase is not used for the controls and is only used for the main transformer it works best. Also different brands work differently. Yeah I know about the safety issues. Hope this helps.
GFM
When you look closely, I think you will find the idler motor is just that. It is not under a large load and does not overheat. Overheat is, after all, the measure of power loss.
GFM
Get a modern electronic Phase Shifter. Small, clean, safe & quick. Done!
You forgot expensive.
GFM
@@grayfurnaceman Paid $300 for mine good for up to 7.5 hp , my lathe works fine ................
Scrap guy gave me a 3 ph motor. I already had a starter motor. $20 trip to the supply store for some bits and pieces and I'm in the 3 phase business. Been running it for 6 years now.
@grayfurnaceman I'm gonna wire up a 3 phase welder using this method! it should work right?
The speed of the pilot motor is not important nor is the rotation. It is only to begin the 3 phase motor rotating. Once the 3 phase motor is rotating reasonably fast it will start running on its own when power is applied.
A friend repairs welders and checks them with 3 phase converted this way. It is best if you can use the single phase circuits for the controls and only use the converted line for the main transformer. That eliminates some of the voltage variations of the 3rd circuit. Yeah, I know about the safety issues with the lathe. Hope this helps.
GFM
I wish we had that here. Much more efficient.
GFM
Wow! I never would have thought of that but, it makes perfect sense. Great video as usual!
Sizing of the 3PH generator motor isn't all that critical.
Example:
I have a 3PH Bridgeport mill at home with a 1-1/2 HP motor. At the time, I didn't have a large enough 3PH generator motor so I hooked everything up using a 1HP 3PH generator motor to generate my 3PH. It worked bcuz I didn't make heavy cuts with the mill. Even tho the generator motor was too small, there was no problem bcuz I didn't load it to capacity.
Loading is the significant factor in sizing of ANY motor.
Well Done. can i do test run on this. i have 240 Volt. 50 Amp Commercial convection oven. would i be able to run if i have this motor? or what kind of three phase motor should i get. thank you.
That is great! I am learning allot from your videos. I was wondering since I am a newbie in tech school, what is a common three phase voltage used in the industry?
And are you planning on doing a intro to three phase video in the future? Thanks again.
I have a very old 3 phase motor, with three black wires (unmarked) sticking out (am unsure which go's where)that would be used as the slave motor with a smaller 110,3/4 hp , starter motor, and would I still need the capacitors ????
For this design, capacitors are not used.
GFM
little uncertain about the drawing : here 3 phase is N(bleu) /L1(brown) /L2(white) /L3(black)
to get single phase 220 volt 60 hrz here you need one of the L's and the N or zero
the drawing you showing uses L1 and L2
are you using two phases to make 3 phases or could you use a phase and a zero as whell ?
reason i ask is because i only have one phase and the zero entering the house
There is no neutral involved. All lines are hot (240v). This is for US power.
GFM
watahyahknow there is no neutral when a single phase motor is wired for high voltage, because hot to neutral is 120v.
And finally, using this system will there be any considerable loss of power or torque to the motors from the 3 phase machines? Thankyou once again
What would happen if you will connect the pony motor in to the running circuit with the selector switch instead of turning it off after start?
Why?
GFM
If I get a 230v idler motor, will it run a 220v machine, also the idler motor will be 5 hp I intend to run a 1.5kw basically 2hp machine will I have issues?
You will be fine. No difference between 220 and 230 volts.
GFM
Are you using a coil as an inductor to store power?
GFM
Interesting - nice videos
could I use a centrifugal clutch on the 110 motor,as the three phase motor seems to speed up when power is applied ??? ( my machine runs good) the only part I had trouble with was third wire becomes a common between both motors or the third phase and the outer casing of three phase motor is grounded
You could of course. Do you want to complicate that much?
GFM
Hi GFM.
I have a wood planer with 10hp 415volt three phase motor. The power to my garage is 240volt single phase and the fuse is rated to 20 amp. If I understand correctly I will need a 15hp three phase 415volt motor and a single phase 240 volt motor. I will plug the 240 volt motor into mains power. This motor will be connected in parallel to the 15hp 415volt motor. In turn this motor will be connected to the 10hp motor on the machine. When I turn on the mains power the 240v motor will spin the 15hp 415v motor which will generate the third phase to the 10hp 415 volt motor on the machine. I have two questions. First will any of this system likely burn out the 20amp fuse of the mains supply? And secondly once I turn off the 240v power to the 240 volt motor what keeps supplying power to the 15hp 415 volt motor?? Thankyou
If you don't have 415 volts, you cannot make this work. If you had 415 volts, you would have 3 phase already there.
GFM
I had a full shop of 3ph. sold most, regrets, will this work to run ,my 3ph welders?
Gee you have no safety standards(smile) I hate lathes that do not have a foot brake
Love the belt guards. Thanks for this
now things are geting easy
I'm confused...even though you're using a 7.5 HP motor as the generator, that little motor driving it looks like it's only maybe 1/4 HP? So how does it produce enough power to run the 5 HP lathe motor? Or does it only work because the lathe is not under heavy load?
The small motor is just there to get the 7.5 hp motor started. Once it is started, it will run on single phase and generate the 3d phase.
GFM
@@grayfurnaceman What is confusing people is that your drawing only shows 2 "motors" but the demo has 3. You say that you turn off the starter motor but you don't make it clear that power from your single phase home wiring is still connected and supplying power to the driver "motor".
Can we use smaller idler motor for bigger motor load and fine tuning with capacitors?
I have never tried that.
GFM
Hi Gary i have a nice 15 hp air compress 3 phase.
I need a compress in my home shop that does not have 3 phase.
I will not use the compress a lot.
If i could get a 20 hp 3 phase motor would your conversion method be practical?
Is the electrical consumption (KW) any greater?
I understand that the 3rd phase is missing in the 240 single phase source motor so the 3rd phase is produced form the field that is not energized so it produces it that is why a 30% bigger production motor is need to satisfy the operating smaller 3 phase.
What is the concern sense the air compress will start under a load?
In advance THANKS, david
Generally I have seen the motor should be 1.5 of the motor you want to operate. There is some loss because you are using an additional motor. Now for the problem. The larger motor must be running when you start the compressor motor. This means you either have to have the larger motor running all the time you want the compressor or you will have to rig a smaller motor to start rotating the larger motor when there is a call for the compressor. Hope this helps.
GFM
Silly question what happens if you make em both work against each other then flick the 3 phase on will it destroy the single phase ??lol
Would it be beneficial to add a Run capacitor parallel to L2 to Driver motor or just leave it ?
Leave it.
GFM
Dear Sir GFM...from what I understand in your diagram...the driver and driven motor is
in parallel in their three terminal,two of the leads of the driver motor is directly connected into single phase,turned off from supply at certain speed. The lathe motor which is three phase is directly connected to the three leads of the driven motor,is that it? The driven motor is 71/2 Hp,lathe is 5HP...how about the driver motor?
I've seen this set up at a local machine shop,and I am impressed by the design.
But took me a while to ponder about it,your videos made it clearer for me...
But still I have lot's of questions. Thank You Very Much,for sharing you work.
Mark Anthony Nilo The 2, 3phase motors are connected in parallel. The driver motor that starts the 7 1/2 hp motor is small, 1/4 to 1/2 hp. Hope this helps.
GFM
if you put a capacitor across to the third leg, it will self-start and should also run more efficiently. I had a system built with like this 35 years ago using a 25 hp 3 PH motor as the main motor. It would start 3 Ph motors under full load and direct online. For the hour at a time I used it, I could run it to 40 amps at 500 volts input driving up to 3 times 3 phase motors plus the main but never more than a steady 40 amp draw’ the main motor was wired star and the rest delta.
Gavin Davis The capacitor method does work. I will do a video on it when I get to it.
GFM
+grayfurnaceman
?? Driving and Driven ?? and OUT-PUT?? more details please ...
the two L1/L2 are the IN-COMING POWER ? (with breakers) Right?
then the two motors. you drew them both the same size...
Just a little more detail please and show output to ... what you are running.
THANKS G
Is there a resource that explains this more in detail or could you please upload a more detailed description? Also if using a capacitor instead of a starting motor what size does the cap need to be. Is it in relation to the driving motor requirements?
Hi, your setup is effective yet simple. But may I ask why not use actual 3 phase wiring from the house's fuse panel? The wiring would certainly be less costly than two additional motors, especially the 7,5hp one. Or am I missing some facts, because I'm living in Finland, in Northern-Europe. Here practically all households - except some residences' in apartment buildings - have 3 phase power (typically 3x25A or 3x35A) in their fuse panels. But is this typically different in other regions of the world?
t kermi It is different here. 3 phase is available mostly in industrial areas. Our voltage is also 120v 240v with 120v in outlets and lighting. GFM
grayfurnaceman OK, we need a lot of power here because of the winter time heating requirements (especially for old houses with not so good insulation), and for electrical stoves (in some other countries stows operate by gas) and for electrically operated sauna stoves (these sauna stoves can require up to 9kW, thou typically around 6kW). So this is probably why we have 3 phase 400V (3 times 230V wires in different phase) everywhere. Te minimum power capability requirement for standard house around 200m2 and with electrical stove and sauna stove, even with geothermal heat pump is about 17kW (and can easily bee around 24kW in old large houses). This 17kW would mean over 140A current if delivered through 120V single phase line...
grayfurnaceman three phase power is three distinctly different sources with the frequency of each source 120 degrees out of phase in respect to the other two.
I wish i had seen this video before i spent over a grand on a rotary phase unit...
Person I worked for had and when not un use the three phase would turn meter backwards
So once you turn the small motor off, is the big motor powering itself? Or taking 220 volts from the house?
Well, if it did, I would have invented perpetual motion.
The small motor starts the large motor because it will not start on single phase. Once it is up to speed it will continue rotating on single phase.
GFM
@@grayfurnaceman Still that is an outstanding thing you have done, I need 208 volts at 100 amps to charge my 27KW battery backup system power company didn't want to bring in 3 phase
How does the 2nd or " load " side motor produce 3 phase voltage by just spinning it's rotor. This is an AC Induction motor right, not a DC motor with a magnetic rotor. So how does it work.
The AC induction motor induces magnetism into the rotor. The rotor in turn induces magnetism into the 3d winding.
GFM
Max R when you spin a motor it essentially becomes an alternator
It does come off sometimes.
GFM
I do things my electrician says can't work-- I currently run a 30 hp 3ph motor (Vaccumn pump)on single phase with no idler -just capacitors 125 -20 mfd run caps for start and balance L1 and L2 with about 120 mfd with a 91 amp,82 amp,86 amp balance on 238 volts have sequence the caps with relays on start up-- been running this for over 10 years, also running a 16hp cnc router with only a 2hp idler
Hahahaha you're a genius... What great solution you're telling about
Good Stuff. Would you ps clarifiy the following point with me as I am in Australia.
Are you ultimately running your 3 phase generator with any Mains feed from your Energy Provider ? I was thinking that you were using the initeria from your 3 phase generator to produce 3 phase power (for your lathe) as well as utilising 1 phase in parallel to back feed your single phase motor (after you have disconnected it from your Mains feed). That was why your needed a 3 phase motor 1.5 X greater than your load duty.
However, I now feel that you are using the single phase motor to bring your 3 phase generator up to the correct RPM, turning on your 2 pole circuit breaker to feed and run only 2 poles of your 3 phase motor on Mains Power as well as partially using the third (generated) phase to run your single phase motor - after you have switched the single phase power line from your Mains.
Your welcomed thoughts please. Well done again.
Paul H The idling motor is operating from single phase. If the motor is brought up to speed, it will run on single phase. The 3d unconnected phase becomes a generator and is available to feed the lathe motor when you need to start it. I think I am saying the same as you. But the main is never disconnected. Let me know if I have not answered your question.
GFM
I looked at this vid again and noted I said exactly the same on all 3 phases. Not so true. When the motor has no load, 3d phase is very low. As the load increases, the amp draw of the 3d phase goes up but will never be exactly the same. Still, you can run at least 80% load without overheating. Sorry about the bobo and thanks for the comment.
GFM
I just uploaded a vid covering the wiring at the motors. Look for: How to connect the wires for the single to 3 phase conversion Hope this helps.
GFM
All good info, thanks.
GFM
I have a AIRCO CV 250 welder 3 phase need to make a 3 phase but each leg is different voltage how do I wire it up or make a converter ?
+Apollo1van What voltage pole tp pole do you have?
GFM
+grayfurnaceman will get back to you on voltage , what are the hp on the motors and the diagram is the driver motor the smaller one ?
+Apollo1van The converter motor is 7.5 hp operating a 5 hp lathe motor. The small motor is there just to get the converter motor rotating. Hope this helps.
I do have a stupid question though what keeps the 3 phase motor running after you turn the smaller starter motor off ? I must have missed something lol- I'll try and find the wiring diagram that might help me to under stand it. Really Great Idea!!!Never gave much thought about making my own power that's pretty cool!
Once the start motor gets the 3 phase motor turning, the 3 phase motor generates the 3d phase to keep it running.
GFM
What is occurring is the 3rd phase is not energised on the primary motor. All the small motor is doing is giving the larger motor enough inertia to spin past that de-energised phase, the small motor can be turned off because the large motor is now self sustaining with the two phases that are energised + the inertia. The third phase is now being generated by the large motor which is being used to power the lathe, along with the other 2 phases.
yes but are all the phases coming out of the energizing motor 415v 3 phase if so what happens to the 240v connected surely it will blow the thing if its generating 415v with the 240v connected .
So I went ahead and gave this a shot and I checked the amperage on the three legs. After shutting off the power from the single phase motor, I was showing 6 amps on two of the phases connected between the two three-phase motors that were also connected to line one and line two but only 0.6 amps on the phase that was powered via induction. The two three-phase motors ran but seems like it would burn them both up after a while. Any ideas what I could be doing wrong?
Your readings are correct. The amp draw increases as the load increases and it becomes more balanced. In any case, unless you are drawing maximum load, the motors should be ok.
GFM
@@grayfurnaceman Thank you so much for the information. One last question. Can an ECM motor be used as the three-phase power?
@@CounselorsinChrist I guess you could try, but I think the electronics would shut it down.
GFM
@@grayfurnaceman If I give it a shot, I'll let you know how it goes. Thanks again!
sir does the rotary phase converter is the same with the single to three phase converter
I have a 550 volt 5HP motor on my mill. I have a 5 HP 575v spare motor. both are obviously 3 phase. what happens if both are 5 hp. is there enough power. you mentioned the supply motor needs to be a higher HP.
If you have 575 volts, you already have 3 phase. In any case, the generating motor must be 1.5 times the mill motor.
GFM
Okay thanks for the reply. Fr now its in a building that I have access to 600 V So Its okay for now.
Normally, reversing a 3 phase motor is done by simply reversing any two motor wires to the source. You will not have full load torque or speed by running a 3 phase motor on single phase, but it will run...but not at the rated load, however.
This is interesting. 😀
Weight is not a bad thing on the slave motor. It helps to smooth out power losses from the third leg being generated. Think of a flywheel.
Nice video
please let me know how to wire up
i want to power up my 3 phase motor to run my milling
why not use the Steinmetz connection to start the 3-phase helper motor?
Interesting! Thank you.
I have a 10 hp three-phase Federal Signal 2t22A siren. So I will need a 15 hp three-phase motor to power the 10 hp motor. How much will a 15 hp weigh?
Can I hand crank it up to enough speed, or need another motor to get the 15hp motor to speed?
The siren motor operates at 3,450 rpm. Iturns two rotors which, at full speed, produce musical pitches D5 and F5, a perfect minor third interval!
Robert Gift you want to sell me that siren? And you don't need a motor to run that.
Ben marquez. It is now an active tornado siren connected to 240-Volt three-phase.
There is another three-phase siren (similar to Alerter) (just motor and rotor/stator) at home which would be fun toperate. Our residential neighborhood has only single-phase.
Robert Gift wow that's cool.. Is the other one at home for sale?
I'd like to keep ito playvith. Too heavy to move. Had to be loaded into the Expedition with a fork lift.Managed to get it out sliding it down 2x8 boards. Was one of City of Englewood, Coldorado's sirens. B&N Mobil Directo? Discarded the fiberglass case in their dumpster. Forgot the stator port counts.
Hi,
I have a Elliot pillar drill 3 phase, motor packed in, if I replace with a single phase with capacitor, then will my reverse switch still work, or is it better to put a 3 phase motor back on so that I can use forward and reverse,
Thanks, and your video are great.
Hornetwind The reverse switch will not work with 1 phase. You can get reversing single phase motors, but it will require rewiring. Hope this helps.
GFM
grayfurnaceman to reverse a single phase motor swap #5 and #8
If I may. I have a horse of a different color. I need to get 3 phase 220 out of 1 phase 220 to run a computer. It is a tire balancer. After the computer turns on then it can turn on the motor. Got any idea how to just get 220 3 phase first and then continue from there. I am thinking I need 2 motors but you would know best.
The video does produce 240 3 phase. As far as I know it should work.
GFM
Stunned did you get this to work? I'm in same boat with an ancient Hoffman balancer.
I have an old hoffman balancer to did it work i know this is old but did it?
OK, start at the beginning. what do you not understand?
Is something such as a starter (contactor and overload protection) advisable? Thanks for the help!
I never argue with someone who wants to install overloads.
GFM
Hi,whats the max speed you get on your lathe chuck ? Does the chuck slow down when you have load on it ?
Thanks
MBG-TECH I haven't checked the speed, but there is no slowdown under load. This type of conversion gets higher torque as the amp draw increases.
GFM
Hi, can i use this on 600 volts equipment ?
Best regards
Is your 7.5 HP generating the extra voltage needed to run your 5HP lathe with load?
Yes.
GFM
That was awesome!!!!
I'd like to see a amp meter on all three legs, im having issues with a rpc now not drawing the same across all three
maybe you used a start capacitor instead of a run? different duty ratings usually.. you could also just switch in extra capacitor(s) momentarily to start the idle motor
Dear sir, the inverter came to industry in 1990,s. I do not see any reason not to use them and enjoy your 3 phase machines anywhere any time any application.
The "inverters" you describe are really just a start cap and relay. The machine operates on single phase and will overheat under high load. The system I described is certainly not perfect and the 3d phase is not energized as completely as the other phases but will operate with more balanced power. Also the "inverters" are quite expensive. 3 phase motors are cheap used. The system I have described cost less than $40. That is why I did the video.
You are right about the price, specially in 1990,s inverter was luxury. We had only 2 or 3 in our school controlling air velocity in a demo unit.
We used this as far back as the 50’s
How does the 3-phase power get to your piece of equipment?
The driven motor is the equipment power source.
GFM
My lathe has a 3 phase 3 hp motor running with just a couple of start caps and a relay- so I'm loosing about 30% power. It would be cheaper in the long run to install a 2hp single phase motor.
+newstart49 Probably would.
GFM