haitijim,
You might not be able to use a simple Voltage Boosting Autotransformer setup for this situation, since the available Voltage is 220 VAC, and your Motor needs 380 VAC.
The only "Booster" setup would require a Secondary Voltage of at least 160 VAC.
In this situation, you may need to just settle for a normal Isolated Transformer (Primary and Secondary not connected as an Autotransformer), and adjust output via "% Voltage Taps".
Please reply if you would like additional information, or more web sites for Transformer Manufacturers.
Scott35 S.E.T.
