Alsthom-atlantique

Michel Olivier

Jean Allegre

A larger number of keys (L) are formed in the outer cylindrical surface of a rotor rim than is strictly necessary for fixing pole pieces (P) thereto. The keys are regularly spaced around the rim. This arrangement makes it possible to avoid having adjacent rim segments offset to each other by an angle which is equal to the pole pitch or at best to the half pole pitch as has previously been the case. The overlap between segments may now be at the pitch of the fixing keys. This can be used to increase the overlap factor, thereby increasing the mechanical strength of the rim against centrifugal forces.

Electric machine rotor having a laminated and segmented rim

The front portion (116) of the immersed turbo-generator bulb houses the alternator (5, 19). The intermediate portion (114) houses the gear box (26), and the rear portion has the turbine (122 projecting therefrom. The intermediate portion is of greater diameter than the front portion and they are interconnected by a flange (2). The external cooling is by tubes (7) through which cooling air flows, and having one end connected to orifices through the flange (2).

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Danjoutin, France

Michel Olivier