Rotor for a rotary electric machine

A rotor of an electric machine, rotating about an axis of rotation (X), the rotor comprising:

• a shaft arranged along the axis of rotation (X),
• a rotor mass, extending along the axis of rotation (X) and disposed around the shaft, the rotor mass comprising:
• -a central bore for the passage of the shaft,
• at least two openings, provided in the rotor mass and distributed circumferentially around the central bore, the two openings leaving a radial strip therebetween, the radial strip having a smaller width (lb),
• at least one bridge of material being provided between an opening and the central bore, the bridge of material being of variable width and having a greater width (lpmax) and a smaller width (lpmin), and having on either side of its greater width (lpmax) areas of smaller width, and the ratio between the smaller width of the radial strip (lb) and the larger width of the bridge of material lpmax) being between 0.75 and 1.25.

A rotor of an electric machine, rotating about an axis of rotation (X), the rotor comprising:

• a shaft arranged along the axis of rotation (X),
• a rotor mass, extending along the axis of rotation (X) and disposed around the shaft, the rotor mass comprising:
• a central bore for the passage of the shaft,
• at least two openings, the openings being all identical, provided in the rotor mass and distributed circumferentially around the central bore, the two openings leave a radial strip therebetween, the radial strip having a smaller width (lb);
• at least one bridge of material being provided between an opening and the central bore, the bridge of material being of variable width and having a greater width (lpmax) and a smaller width (lpmin), and the ratio between the smaller width of the radial strip (lb) and the larger width of the bridge of material (lpmax) being between 0.75 and 1.25.