I have a grain mill with a 220v single phase motor. I'd like to use this in the USA where the standard voltage is 110v or 240v split phase. Since I need a 220v primary line, a neutral and ground (3 wire), what type of transformers I should be looking for. I bought a heavy duty transformer online but soon found out that that darn thing gives out only split phase 220v (i.e., two hot 110V). Thanks in advance.