Rotor and method of impregnation of the windings

1. A rotor of an electric rotating machine for a vehicle, the rotor comprising:

a rotor shaft;

a rotor core having a core length and comprising longitudinal grooves distributed along an outer circumference of the rotor core, the longitudinal grooves covering the core length, the rotor core being mounted on the rotor shaft;

windings located within the longitudinal grooves and forming protruding windings ends at each end of the rotor core;

two impregnation rings both having an annular shape and located at both ends of the rotor core;

wherein each of the two impregnation rings comprises an annular portion and a deflector portion both joined to one another on an end, the annular portion comprising radial openings, the deflector portion facing the protruding windings ends and being configured to guide an impregnation agent from the radial openings towards the protruding windings ends for evenly and in-depth impregnating the windings.

2. A rotor as claimed in claim 1 , comprising end shields, the annular portion being mounted on the end shields.

3. A rotor as claimed in claim 1 , wherein the deflector portion has an accurately curved section.

4. A rotor as claimed in claim 3 , wherein the deflector portion comprises an inner tip having a terminal end located at an intermediary height of the protruding windings ends.

5. A rotor as claimed in claim 1 , wherein the radial openings have an opening width and an opening length, the radial openings being distributed regularly along the annular portion with an opening distribution angle between the radial openings.

6. A rotor as claimed in claim 1 , wherein the two impregnation rings comprise annular grooves in between the radial openings, the annular grooves connecting fluidly the radial openings and being configured to guide the impregnation agent towards the radial openings.

7. A method for impregnating a rotor comprising a rotor shaft, a rotor core having a core length, windings, and two impregnation rings located at both ends of the rotor core, the windings forming at each end of the rotor core protruding windings ends, each one of the two impregnation rings comprising an annular portion and a deflector portion, the annular portion comprising radial openings having an opening length, being distributed regularly along the annular portion with an opening distribution angle between the radial openings, the method comprising:

starting a rotation of the rotor shaft mounted on a rotating apparatus having a rotating velocity;

impregnating the windings through two nozzles respectively located upward each one of the two impregnation rings and oriented towards the radial openings;

wherein impregnating the windings includes applying an impregnation agent from the two nozzles through the radial openings onto the protruding windings ends at a same time, the impregnation agent being guided by the deflector portion in order to impregnate the windings through the core length.

8. The method as claimed in claim 7 , wherein applying the impregnation agent is performed at regular time intervals with an application frequency and an application duration both corresponding to the rotating velocity, the opening length and the opening distribution angle being configured such that applying the impregnation agent is occurring when the radial openings are facing the two nozzles.

9. The method as claimed in claim 8 , the two impregnation rings comprising annular grooves, wherein applying the impregnation agent is performed at once.

10. The method as claimed in claim 7 , wherein applying the impregnation agent consists in spraying the impregnation agent through the radial openings.