They are downloading now but I should have waited until I had a lower internet usage going on LOL
David I know of 2 or 3 guys who make their own transformers 1 lives on Flinders Island Au another over in NewZeeland Not sure wher the other guy lives but I have used his online calculator to make several small buck & boost and step down transformers. He goes by the username of Josetue the link to his spreadsheet is on his post on this page about halfway down
From New SMA INVERTER SI6.OH-11, battery full 50HZ Jumps to 60Hz
OZtules is a foremost authority on building power inverters and just about any other off grid power generation His 6KW pure sine inverters have been made by several. I'm not sure about their 3 ph activity though but their published information is well worth having a look at
Here is a link to Joestue's spreadsheets
Index of /bulk/spreadsheets
I downloaded your RPC plans and had a look at them You used a different approach than what I have, but very informative and well written thanks When I build my next 8hp RPC I can see incorporating your plans with the way my current RPC is made because I like having the capacitors to balance out the ph shift
Never try to tell me it can't be done
When I have to paint I use KBS products
FYI
I have made my own transform a long time ago. The hard part is find a core the low cost way was to build a TOROID type and use gal electric fence wire simple to wind into a dough shape. The in recent I used is microwave transform core
In some parts of world they use a bank of capacitors for AC 3 phase when they only have single phase power. But only works when have the same load on the motor. This not work for machine tool or air compressor as the load changes.
At one time in life look into or try ever way as shop only had single phase. I finally landed on four ways
1) change the motor
2) rotary converter
3) static converter
4) motor generator
I did at time have over 20 employs working for me manufacturing aircraft hangar doors
Dave
Last edited by smithdoor; Jan 20, 2017 at 10:50 AM.
Do you mean you boys down there need to import things like this? Crikie! I could come down there, open up a shop and get rich!
You don't need a 3-phase transformer. Single phase boost transformer ANSI schematic below:
Sorry, I've not yet been able to finger out those ISO symbols.
The output section is configured so that there is a 180° phase shift from one output to the other. That will give you two 230V outputs a half phase apart. That is what we have for residential high voltage here in the USA (except it's 240-250V). With that you can use that at the input to my design and create (kind of) a 230V 3-phase suitable to run your 230V, 3-phase motors with reduced horsepower output (83.3% of the nameplate rating)
Thank you for the compliment.
Last edited by nhengineer; Jan 20, 2017 at 12:52 PM.
Rhengineer,
You possibly could come down here and get rich,........provided you're prepared to import a shipping container full at a time, it's the freight that kills us. If I buy a Briggs and Stratton engine here, it'll cost me $100 per hp, I used to run a business mowing grass, and at the time a 20hp engine was $2000 plus gst (10%) when the US price for the same engine was $400 plus freight, but it still meant that I could land it here for around $1000.
The answer to the question of do we have to import this stuff...yup! because the local cost is even greater.
Rob.
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