Single phase input to 3 phase output?

we are not interested to give you any diagram... please get lost

RUMOR?? what the?

sorry about saying "rumor". Cause i ask different electrician and they don't know how single phase to 3 phase. Only a handful knows it. If you can give me just the idea, i know there was a contactor, and a capacitor. what i don't know is how to compute the capacitor for the motor load. I got 10kva a motor, so i don;t know the range of the capacitor per HP.

But it is already discussed on this forum and you can see it just by using search.

There are ways to get 3φ from 1φ...there are many discussions on this forum. Please use the "Search" function at the right and go through all of them...

1. 10kVA does not tell you the HP. If you meant 10kW, then that is about 7.5HP. It all you know is the apparent power (kVA), then it's probably closer to 5HP.
   
2. It can be done, but you lose approximately 35% of the motor HP to do it that way. So your 7.5HP motor becomes 5HP or you 5HP becomes 3HP. If you insist on continuing this way, do a search on the term "Static Phase Converter" or "Static Phase Adder", many many sites will show you schematics and data necessary to accomplish this. But still, your motor capacity will be reduced or you will burn it up.
3. One way to do it without losing HP is to make a "Rotary Phase Converter" using another motor. Many of the search results will show that option as well.
   
4. Better way to do it is to buy a VFD that is twice the current rating of the motor, the VFD will accept the 1 phase input and give you a 3 phase output.
   

If you look there are many threads in this section on this subject.

Use the search engine in the top RH corner of your screen.

Ever get the feeling you've become an echo?

Hey Tony, it's no so bad - after a while lot's of people will be echoing your answers like they were theirs. _{But at least now they have 'the answers' ^{the answers the answers the answers... ...}}

the diagram I wont give you, but I can say that with a single capacitor you wont get a 3 phase output. with some more components you can, but with a lot of distortion on those phases

ah, so it is not advisable. k, thanks!

it is a interesting question in any case... and it can be handy when you dont have other resorce than to improvise!

use a 1 phase to 3 phase invertor-easyer 240 in 415 out

Her you go. At near 10,000 views I would say I have made this information available to more than just a handful of people by now.

http://www.electro-tech-online.com/re-projects/100563-3-phase-converter-schematic-miller-system.html

And yes I am the same person there as I am here.

That's really neat.

But just a question - isn't that a 2 phase feed?

It's possible that the OP is in a system where "single phase" means 1 active and a neutral, or two 'false phases' need creating.

If that's the case - can/does it do that? or am I reading it wrong?

Thanks! Its something I figured out in college back in the mid 90's when I got out of high school. I refined and fine tuned the formulas for it a few years later to what the thread suggests and have since built more than I can count and have had very good results with the design being efficient reliable and incredibly durable.

I am rather pleased with the number of average views that thread gets and the number of private messages I get on that site from people who have built them and saved boat loads of money by being able to efficiently use surplus commercial three phase machinery on single phase power sources without problems.

In North America we have center tapped single phase systems where the two power lines are 180 degrees out of phase with each other and the center tap the common ground reference point. Its how we get a 120,240 volt single phase system where either hot line to common ground is only 120 volts but from line to line we can get 240 volts and the common center ground is simply ignored at that point.

Its common misconception though that its a two phase system being there are two power lines. If it where a true two phase system the two power lines would have to be 90 degrees out of phase not 180.