Author Topic: 1-phase to 3-phase inverter (Read 39212 times)

rkahler · « **on:** October 15, 2009, 02:14:32 PM »

I need inverter with 1-phase input and 3-phase output.
Can somebody make a suggestion ?
I tried Google, but I'm lost in all high tech datasheets.

Goat · « **Reply #1 on:** October 15, 2009, 03:44:14 PM »

@ rkahler

One way to do this is to use a 3 phase electric motor and connect 2 of the lines to single phase then use the 3rd line as the supply for the 3rd phase.

This is not a very efficient way to do it but it does work.

Regards,
Paul

rkahler · « **Reply #2 on:** October 15, 2009, 04:14:34 PM »

Thanks, but I don't like this idea.

I'm working on generator that will give me a single phase at the and.
My main load will be electric boiler which is 3-phase and I would like to be able to run it with that generator.
Further more, I would like to replace input for all 3 phases in my house.

Staffman · « **Reply #3 on:** October 15, 2009, 04:48:45 PM »

Check out http://en.wikipedia.org/wiki/Inverter_(electrical)....

Look at the section marked 'Three phase inverters' for a simple circuit. The only problem is that it is missing the triggering circuit.

A different way to make 3 phase energy is to modify a distributor.

dankie · « **Reply #4 on:** October 15, 2009, 05:27:23 PM »

http://www.youtube.com/user/dankiewfc#p/a

I made dc to 3 phase-pure sine oscillator, It was ALOT of work and alot of $ developping it .

But right now I have no $ to buy the components and release my product . I am saving up @ my day job , hopefully I will release soon and sell on ebay .

It will be expensive however , it will be rated for low power usage also , 125w to 200w maximum per phase . I feel that you are trying to run a wind turbine of some sort and turn that into 3 phase , my thing will not be good for that .

I think you can find schematics for a single phase to 3 phase, or purchase one .

MasterPlaster · « **Reply #5 on:** October 15, 2009, 06:36:32 PM »

Try these links. I don't know if it works. I have not tried it.

http://www.metalwebnews.com/howto/phase-converter/3-phase.pdf

Also

http://www.metalwebnews.com/howto/ph-conv/ph-conv.html

Let us know how you get on.

PhiScience · « **Reply #6 on:** October 15, 2009, 08:16:42 PM »

Hi rkahler,

I have been using a static converter on an air compressor and a Bridgeport mill for years now and it works just fine. I got it from McMaster-Carr, itâ€™s on the bottom of this catalog page.
http://www.mcmaster.com/#catalog/115/921

Or you can get one off of ebay they also sell plans.
http://shop.ebay.com/?_from=R40&_trksid=p3907.m38.l1313&_nkw=phase+converters++&_sacat=See-All-Categories

d3adp00l · « **Reply #7 on:** October 18, 2009, 08:49:20 AM »

dude just go on ebay,

http://cgi.ebay.com/1-HP-115V-IN-230-3-PHASE-OUT-VFD-FREQUENCY-DRIVE-NEW_W0QQitemZ360113575521QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item53d8711661

VFD drives can take 1 phase and make 3 phase, because vfds take ac turn it into dc, and then it makes 3 phase using 6 igbt fets. It switches the dc back and forth in three different phases.

rkahler · « **Reply #8 on:** October 18, 2009, 10:17:16 AM »

Thanks, but I need at least 25 HP.

the_big_m_in_ok · « **Reply #9 on:** October 18, 2009, 06:04:13 PM »

Quote from: rkahler on October 15, 2009, 02:14:32 PM

I need inverter with 1-phase input and 3-phase output.
Can somebody make a suggestion ?
I tried Google, but I'm lost in all high tech datasheets.

http://www.google.com/advanced_patent_search or,
http://www.pat2pdf.org

Patent #5,388,031
As a modification, this one has to be turned around the opposite way, but it would be simple.

But, as a concept, would it work as you want it to? Wiring a transformer to give 2 phases from one signal input can be done, but the ground leg is just 0 volts---no phase to it, right?

I occurs to me that using only the hot side of 3 phases would give you one phase from three.
If you want the total output of the generator, a phase shifter to align the three phases from 120 degrees offset to one single phase would also work.

--Lee

rkahler · « **Reply #10 on:** October 18, 2009, 06:41:35 PM »

I don't think it can work that way, but I'll look into it.

the_big_m_in_ok · « **Reply #11 on:** October 18, 2009, 10:38:56 PM »

Quote from: rkahler on October 18, 2009, 06:41:35 PM

I don't think it can work that way, but I'll look into it.

I was writing thoughts down on the keyboard. I realize some of what I wrote may or may not work, but the phase shifter I wrote about should work in principle.

Here's another idea:

Take a transformer, connected to hot and ground of the generator, to the primary coil. One end of the secondary is the output, the other end is grounded. Use the neutral lead for the other leg of your output as 2-phase AC?
NOTE:
This was a flash of theoretical inspiration. I haven't tried it in practice.

--Lee

sparks · « **Reply #12 on:** October 19, 2009, 03:19:09 AM »

I don't know what your budget is but the cheapest way out is get hold of a 3phase electric motor around 30hp. Then feed the single phase input to 2 legs of the 30hp motor/converter. From one leg to the dead input of the converter connect a bank of ac rated 3000fmd starting capacitors. You will need to have a device to disconnect the capacitors once the converter is up to speed. Also across this bank you will need to connect a bank of permanent capacitors of approximately 400mfd rating. Once the converter motor is started it will generate the third leg. You will need to derate the horsepower of your 3phase load because the output of the converter is far from balanced.
There are also 1phase to 3phase variable frequency drives which will act as both a phase converter and give you the option of slowing down or speeding up your load motors. They tend to get expensive in the higher horsepower ratings but it will not be necessary to derate your load motors.

dankie · « **Reply #13 on:** October 19, 2009, 04:01:17 AM »

Rkhaler , you have some serious reading to do if you wanna do this yourself.

You will have to understand those high-tech datasheeets or consult an engineer .

If you expect somebody to do it for you on the net then you are seriously mistaking.

the_big_m_in_ok · « **Reply #14 on:** October 19, 2009, 04:50:39 AM »

Quote from: dankie on October 19, 2009, 04:01:17 AM

Rkhaler , you have some serious reading to do if you wanna do this yourself.
...You will have to understand those high-tech datasheeets or consult an engineer . ... If you expect somebody to do it for you on the net then you are seriously mistaking.

@rkahler
dankie is correct. This is a research forum and personal experimentation is the usually what's practiced, with helpful comments being supplied from Members as required.

Studying further on the subject you have a question about would be the way to go, in my opinion.

--Lee

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