Fin and insert cooling device

1. A cooling device having a surface configured to allow the circulation of a heat-transfer fluid along the surface in a first direction (D 1 ), an exchange of heat being able to take place by convection between the cooling device and the fluid,

the device comprising:

n cooling fins, n being an integer greater than or equal to two, each cooling fin forming a protuberance of the device, extending primarily in a plane (P) containing the first direction (D 1 ),

in each fin, at least two inserts having a tube form and a dimension characteristic of a section of the tube (D) and extending primarily in a second direction (D 2 ) of the plane (P) distinct from the first direction (D 1 ), the inserts having, over a greater length (L 2 ), a thermal resistance lower than a thermal resistance of the cooling fin along a same length,

each insert being distant in the first direction (D 1 ) from another insert by a length equal to or greater than the characteristic dimension of the section of the tube (D) of the insert, wherein, the n cooling fins each comprising at least two inserts, the n cooling fins extend in the first direction (D 1 ) and in a different location along a circumferential direction, the inserts of cooling fins adjacent in the circumferential direction having a location along the first direction offset by a length greater than or equal to the characteristic dimension of the section of the tube (D) of the inserts in the first direction (D 1 ), such that the inserts of a first cooling fin are respectively located circumferentially adjacent to corresponding portions of an adjacent second cooling fin in the circumferential direction, the corresponding portions of the adjacent second cooling fin being devoid of inserts.

2. The cooling device according to claim 1 , wherein the tube form of the inserts extends in a third direction (D 3 ) of the tube and wherein the inserts are embedded in the corresponding cooling fin over a greater proportion of their length in the third direction (D 3 ) of the tube.

3. The cooling device according to claim 1 , wherein the inserts are heat pipes.

4. The cooling device according to claim 1 , wherein the characteristic dimension of the section of the tube (D) of the insert is greater than a thickness (E) of the corresponding cooling fin defined outside of a section (P 1 ) of the cooling fin at right angles to the first direction (D 1 ) and passing through the insert.

5. The cooling device according to claim 4 , n being an integer greater than or equal to two, wherein ones of the n cooling fins extend along the first direction (D 1 ) at different locations along an axis (A 1 ) of the section (P 1 ) in the circumferential direction, the ones of the inserts having the same location in the first direction (D 1 ).

6. The cooling device according to claim 1 , wherein each insert is embedded in a cooling fin accommodating it.

7. The cooling device according to claim 1 , wherein the greater length (L 2 ) of each insert is equal to or greater than a greater length (L) of a respective cooling fin in a section (P 1 ) of the cooling fin at right angles to the first direction (D 1 ).

8. The cooling device according to claim 1 , wherein each cooling fin has a smaller section at an end.

9. The cooling device according to claim 1 , n being an integer greater than or equal to two, wherein several of the n cooling fins are aligned in the first direction (D 1 ).

10. The cooling device according to claim 1 , wherein a thermal grease is applied between each insert and a corresponding cooling fin.

11. An electrical machine comprising a field frame on which windings bear and equipped with the cooling device according to claim 1 .