Rotating electrical machine, set of such machines, and associated boat and rolling mill

A rotating electrical machine, comprising:

• a stator;
• a shaft centered in the stator;
• and
• a first cylindrical magnetic mass and a second cylindrical magnetic mass, the first cylindrical magnetic mass and the second cylindrical magnetic mass enclosing the shaft and arranged in series on the shaft, the first cylindrical magnetic mass and the second cylindrical magnetic mass being separated by an air gap, the stator including coils, each coil being opposite to the two cylindrical magnetic masses, each cylindrical magnetic mass comprising a stack of compacted laminated magnetic sheets, a first fastener configured to fix the first cylindrical magnetic mass and the shaft, and a second fastener configured to fix the second cylindrical magnetic mass and the shaft;
• a first full rim including a first central circular aperture, the first magnetic mass being fastened on the periphery of the first full rim;
• a second full rim including a second central circular aperture, the second magnetic mass being fastened on the periphery of the second full rim;
• a first shaft collar and a second shaft collar on the shaft, wherein:
• the first fastener comprises a first shoulder on the periphery of the first shaft collar and first fixing means;
• the first full rim is into abutment against the first shoulder and is fixed to the first shaft collar by the first fixing means;
• the second full rim is into abutment against the second shoulder and is fixed to the second shaft collar by a second fixing means;
• the first shoulder comprises a first cylindrical surface in contact with the circumferential surface of the first central circular aperture and a first annular surface perpendicular to the first cylindrical surface in contact with the first full rim;
• and
• a second shoulder comprises a second cylindrical surface in contact with the circumferential surface of the second central circular aperture and a second annular surface perpendicular to the second cylindrical surface and in contact with the second rim.