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A large number of motors (maybe just IEC) are dual voltage 400/690V.
The IEC motors typically use 3 windings and offer dual voltages by either a star or delta connection. The voltage ratio is 1.73:1
NEMA motors use 6 windings and offer dual voltages by either a series or a parallel connection. There is a buried connection and the motors cannot be changed from the normal star to delta in the field. There are also some legacy delta motors with 3 buried connections.
The voltage ratio is 2:1
The connection diagrams for a twelve lead generator give a good overview. The diagrams with the windings in series are applicable to most IEC motors.
The diagrams with a star point are applicable to most NEMA motors.
As always, there are exceptions. Even this statement has exceptions.
respectfully