Rotary Phase Converter (Create 3-phase power from a single phase source)

[nhengineer]

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

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!

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

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)

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

Thank you for the compliment.