Rotor with non-through shaft, assembly of rotors, rotor with multiple magnetic masses and associated rotary electrical machine

1. A rotor with a non-through shaft for an electrical machine, the rotor comprising:

two half-shafts; and

a cylindrical magnetic mass gripped between, and directly connected to, the two half-shafts, each half-shaft being formed in a single piece and comprising a mounting flange connected to the cylindrical magnetic mass at one end;

wherein each half-shaft of the two half-shafts comprises a coupling flange integrally combined therewith at an outer side thereof;

wherein the half-shaft is located opposite each mounting flange;

wherein the coupling flange comprises through holes distributed in staggered rows over at least two different diameters of the coupling flange to accommodate fastening components so as to transmit a torque;

wherein (i) a first diameter of the at least two different diameters of the coupling flange contains a first row of through holes and is smaller than or equal to 0.9 times an outer diameter of the coupling flange and (ii) a second diameter of the at least two different diameters of the coupling flange contains a second row of through holes and is smaller than or equal to 0.8 times the outer diameter of the coupling flange;

wherein a double torque transmission occurs at each side of the rotor; and

wherein the through holes are alternately smooth and tapped such that a smooth hole of the coupling flange is coaxial to a tapped hole of another coupling flange and a tapped hole of the coupling flange is coaxial with a smooth hole of the other coupling flange, and the fastening components each pass through the smooth hole and are engaged in a tapped hole of corresponding coupling flanges, and each fastening component includes a first side which is arranged alternatively in adjacent through holes along opposite sides of the coupling flange, wherein an angular distance between the adjacent through increases the torque transmitted.

2. The rotor according to claim 1 , wherein each half-shaft of the two half-shafts comprises a median shaft, and wherein the mounting flange and the coupling flange of each half-shaft of the two half-shafts are connected by the median shaft.

3. The rotor according to claim 2 , wherein the median shafts have different lengths.

4. The rotor according to claim 3 , wherein the coupling flanges have a different diameter.

5. The rotor according to claim 4 , wherein an outer diameter of at least one coupling flange is smaller than or equal to an outer diameter of the cylindrical magnetic mass.

6. The rotor according to claim 2 , wherein the two half-shafts are substantially identical.

7. The rotor according to claim 1 , wherein the cylindrical magnetic mass comprises compacted magnetic sheets.

8. The rotor according to claim 1 , wherein the cylindrical magnetic mass comprises a stack of metal plates.

9. The rotor according to claim 8 , further comprising tie rods distributed uniformly over at least one diameter of the cylindrical magnetic mass to keep the cylindrical magnetic mass compacted between the two half-shafts, a diameter of at least one median shaft being greater than an implantation diameter of the tie rods, an outer diameter of the mounting flange of each half-shaft of the two half-shafts being equal to a diameter of the at least one median shaft, one end of each tie rod being engaged in a tapping of the at least one median shaft comprising tappings equal to a total number of tie rods.

10. The rotor according claim 1 , wherein the cylindrical magnetic mass comprises a monobloc metal body.

11. The rotor according to claim 10 , wherein the cylindrical magnetic mass comprises a central recess.

12. The rotor according to claim 11 , wherein the cylindrical magnetic mass comprises conductive bars and two short-circuit rings to form a squirrel cage, wherein the two short-circuit rings not being compacted between the mounting flange of each half shaft of the two half shafts and the cylindrical magnetic mass.

13. An assembly of rotors in series comprising:

at least two rotors according to the rotor of claim 1 , wherein a coupling flange of one rotor of the at least two rotors is fastened to a coupling flange of another rotor of the at least two rotors coaxially, to transmit a torque between the two rotors.

14. The assembly of rotors in series according to claim 13 , wherein the coupling flanges of the assembly of rotors are fixed to one another by means of an intermediate shaft comprising two coupling flanges.

15. The assembly of rotors in series according to claim 14 , wherein the intermediate shaft is maintained by a bearing.