I think there might be a little misunderstanding. My original question never was about motors. I fully understand the relationship between motors and supply voltages.
My original question was about a very large machine and the transformer to supply it.
The only reason I posted the question in the first place is because a fellow electrician was questioning me on weather it was correct to order a transformer with a 480-volt secondary when the data plate on the machine specified 460 volts.
I am now assured that a 480-volt secondary is correct.
Thanks for all of your replies!
