3 Phase Similation
3 Phase Similation
(OP)
Could someone help me with a circuit to duplicate 3 phase from 120VAC single phase. It does not have to be accurate but I would like to show some real "dummy" values for voltage and current. Can this be done. I have a small transformer that I dupe 2 voltages but being a mech . engineer not saavy enough to figure out the current or 3rd voltage leg. thanks






RE: 3 Phase Similation
RE: 3 Phase Similation
RE: 3 Phase Similation
You may feed one phase of a three phase motor with single phase. Once the motor is started it will run on one phase and generate three phase. You may start it electrically with capacitors or just give the shaft a spin and then energise it.
It depends on your budget and the intended use of the three phase.
respectfully
RE: 3 Phase Similation
Maybe you should explain that a little more. Stevenal's solution is by far the cheapest and most portable, but unless you have some pretty sophisticated instruments, you are not going to read anything useful of the output side of a VFD.
Waross's suggestion is going to be better than a VFD in terms of reading quasi-3 phase voltages, but portability and ease of use becomes an issue.
JRaef.com
"Engineers like to solve problems. If there are no problems handily available, they will create their own problems." Scott Adams
For the best use of Eng-Tips, please click here -> FAQ731-376
RE: 3 Phase Similation
You are echoing a concern I had about the VFD. What about a small 3 phase motor idling on the output of the VFD to smooth out the waveform. Between the VFD and the motor back EMF would this be more usable than a "bare" VFD?
Respectfully
RE: 3 Phase Similation
RE: 3 Phase Similation
1 - Variable transformer (could be omitted)
1 - Step-up transformer
2 - Fixed value capacitors
2 - Variable resistors or rheostats
Article was written by Robert C. Davey
"How To Get Three-Phase Power from Singe-Phase Supply."
RE: 3 Phase Similation
Do you have a copy of this article by any chance?, I check the net but even the archieves available do not go that far.
thanks
RE: 3 Phase Similation
No problem there. But I do know how to send or post the file. Maybe some one in this forum knows how.
RE: 3 Phase Similation
FAQ238-1161
Stop at the point that you post them in here as images - instead just paste the links in here.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: 3 Phase Similation
http://i1.tinypic.com/2vsiuiw.jpg
http://i1.tinypic.com/4i4mowp.jpg
http://i6.tinypic.com/2lkfvqd.jpg
http://i10.tinypic.com/2hrialw.jpg
If you built this. Please let us know how it worked out for you.
I will also be intrested to hear any comments on this design.
RE: 3 Phase Similation
respectfully
RE: 3 Phase Similation
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com