-> start capacitors. A much better method is to build a rotary converter
That's a tad complicated for running an el cheapo air compressor.
But, while I have an EXPERT on hand.....
Anything to be gained from running a 220v 3 phase motor across the 220
line and referencing the run cap back to line neutral?  Might that help
balance the winding currents?
 ^..^
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