If you are moving to the United States with 220-volt plugs on your appliances, you can use a "step-up and step-down" transformer. This type of transformer is a device that you can plug 220-volt items into so the voltage is "stepped down" or plug 120-volt items into so the voltage can be "stepped up" so they are compatible with 220-volt sockets. There is a wide array of step-up and step-down transformers. However, they all work in essentially the same way. You can use these transformers on large appliances with motors like washers, dryers, air conditioners and generators.
Plug the step-up and step-down transformer into your 120-volt wall plug.
Locate the appropriate 220-volt socket formation on the back end of the step-up and step-down transformer that matches the plug formation of the motor you need to convert. Connect the plug of the item you need to convert into the transformer.
Turn the transformer's power on.
Power up the motor of the appliance or device you have plugged into the transformer.