Wind turbine generators and methods for rotating a hub of a wind turbine

A method for rotating a hub of a wind turbine in an inching operation to rotate the hub, the wind turbine having a generator with a rotor and a stator, and the method comprising:

• for the inching operation, coupling a first string of a first electrical phase of the stator in series with a second string of a second electrical phase of the stator, the first and second strings comprising one or more coils coupled in series;
• providing current from a power converter to the first and second strings of the stator to rotate the hub;
• and
• wherein the generator comprises a first and a second winding system, each of the first and second winding systems comprising a plurality of electrical phases in a normal operation of the generator, and wherein the first string of the first electrical phase is part of the first winding system in the normal operation of the generator, and the second string of the second electrical phase is part of the second winding system in the normal operation of the generator.