General Electric Renovables Espana, S.l.

Nuovo Pignone Tecnologie Srl

Giuseppe Iurisci

Giuseppe Sassanelli

Francesco Cangioli

Leonardo Baldassarre

Julio Cesar Urresty

Angelo Grimaldi

Antonio Pelagotti

Davide Biliotti

Shanmuga-Priyan Subramanian

Paola Di Festa

Dario Matina

Roberto Marchi

Sergio Ghezzi

Maxime Fournier

Stanislas Haentjens

Elvira Bongermino

The present disclosure relates to electrical machines and methods for cooling active elements of electrical machines. More in particular, the present disclosure relates to rotors of electrical machines. An electrical machine may for example be a generator for a direct drive wind turbine. An electrical machine comprises a rotor comprising a plurality of active rotor elements, a stator comprising a plurality of active stator elements, and an air gap separating the active rotor elements and the active stator elements. The rotor further comprises one or more rotor openings configured for letting air flow enter the electrical machine and cool the active rotor elements and/or active stator elements in response to a rotation of the rotor.

Cooling of active elements of electrical machines

A method for rotating a hub of a wind turbine in an inching operation to rotate the hub includes reconfiguring the generator from normal operation by 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. Current is provided from a power converter to the first and second strings o rotate the hub. The generator includes a first and a second winding system, each including a plurality of electrical phases in the normal operation. The first string of the first electrical phase is part of the first winding system in normal operation, and the second string of the second electrical phase is part of the second winding system in the normal operation.

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

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Barcelona, Spain

Giuseppe Iurisci