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.
@ 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
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.
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.
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 .
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.
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, it’s on the bottom of this catalog page.
http://www.mcmaster.com/#catalog/115/921 (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 (http://shop.ebay.com/?_from=R40&_trksid=p3907.m38.l1313&_nkw=phase+converters++&_sacat=See-All-Categories)
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.
Thanks, but I need at least 25 HP.
Quote from: rkahler on October 15, 2009, 08:14:32 AM
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
I don't think it can work that way, but I'll look into it.
Quote from: rkahler on October 18, 2009, 12:41:35 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
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.
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.
Quote from: dankie on October 18, 2009, 10:01:17 PM
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
http://cgi.ebay.com/25-HP-ROTARY-PHASE-CONVERTER-CNC-air-compressor-saw_W0QQitemZ390098532173QQcmdZViewItemQQptZBI_Electrical_Equipment_Tools?hash=item5ad3af374d
Although I am not sure why you would want such a large phase converter. Its easier to buy a single phase motor, and swap it out for the 3 phase motor. But thats just the electrical contractor that I am talking.
I'm not expecting that somebody else will do work or research for me.
I was hoping to find somebody who worked with such devices to point on some of them.
Local engineers had nothing for me, no device, no idea.
So, thanks for all ideas.
rkahler said:
Quote
Local engineers had nothing for me, no device, no idea.
So, thanks for all ideas.
I had an idea for a regeneratively cooled(using its own fuel; typically liquid ammonia, xenon, etc) ion/plasma thruster and I got some free advice from a business owner who did custom prototyping: Get a patent or your idea will probably be stolen.
That was the only time I got free advice. I suspect all others---especially nowadays---will require payment. Probably in advance with a signed contract.
My Dad was an engineer for 30 years and he never worked for free.
All Members and informal forum guests might want to keep this FYI experience in mind for the future, if they don't know now.
--Lee
Not sure if you already found something but:
http://www.ronkelectrical.com/add_a_phase.html
Quote from: Staffman on October 15, 2009, 10:48:45 AM
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.
You must no do this work.
The resistance of 3 heaters in the boiler ist done TO SPLIT THE NEEDED POWER in 3 pases of YOUR LINE.
Because it is to mucht to suck 20Kilowatt from 1 Phase.
: so approx 3 time 7 KW are split to 3 phases.
IF YOU will invert 1 pase to 3. You must alse have in ONE Phase 20KW
and this ist to much.
IF THIS IST possibel,
You acan connect all 3 phases-wires (from the boiler) to ONE Phase of your line-source.
BUT the 20KW (will not hold by the fuse and hous installations)
What you cabnn do ...
IS.
Conect only 1 phase of the boiler to your Line-supply.
AND WAIT
3 time longer to heat the water.
No problem , if all was installed - use this way.
G Pese
---
For other appication. (if the 3 phase (with each 120 degrees shifting ist necessary) to drive motors enz.
The cheapes way ist to use am motor-generator.
1 phase motor coupled with an 3 phase generator (dynamo) .
c
@Pese
Imagine the power you could get down a single wire using ground as the return wire if you made the single conductor carry 5000 phase.
Quote from: sparks on February 09, 2010, 08:12:28 AM
@Pese
Imagine the power you could get down a single wire using
ground as the return wire if you made the single conductor
carry 5000 phase.
Three phase uses three wires and 5000 phase would use 5000 wires.
If the total power in the system is sent down a single wire it will
be 3 or 5000 times as much as in each individual wire. It's all about
on-average using smaller current wires traded off with many more
connections.
Usually only some part of a machine will operate on 3 phase and the
controls will operate on only one...because 3 phase uses many more
components to perform the same function. So only where there is
a payoff, in the heater or in the motor will 3 phase really be used.
So, study the machines schematics and remove and replace just
the three phase components with single phase ones.
:S:MarkSCoffman
mscoffman
The single phase output can be at very high frequency. This allows for very little current while transmitting alot of power. The voltage drop of the transmitting line very little because the currents are minimal while the change in charge state along the conductor is maximal.