I use a Chinese VFD with single phase 220 input and power both my 3 phase motors, a .75hp on the mill and a 1.5hp on the lathe. I use a 2 position toggle switch to go from mill to lathe. Over a year with no issues. Except that I discovered recently I've been running it as default 50Hz instead of 60Hz. Now the motors run quieter and I gained some RPM too, not that I necessarily needed it.