Power supply comprising a hydraulic machine exhibiting improved integration

1 . A system comprising:

a primary machine, a hydraulic machine and a frequency converter disposed in an assembly casing,

said system comprises a cooling circuit, adapted for a same coolant to go through a plurality of ducts adapted for cooling the primary machine, the frequency converter and the hydraulic machine wherein the coolant is identical to a work fluid of the hydraulic machine wherein said working fluid is oil, and

wherein the assembly casing comprises an intake port and a discharge port connected to the cooling circuit for the circulation of the coolant in the assembly casing, and an intake port and a discharge port connected to an intake and a discharge of the hydraulic machine for the circulation of said work fluid of the hydraulic machine.

2 . The system as claimed in claim 1 , wherein

the primary machine comprises a primary casing,

the hydraulic machine comprises a machine casing,

the primary casing and the machine casing being secured to one another, and

comprising inner ducts communicating at an interface between the primary casing and the machine casing, allowing the passage of the coolant between the primary casing and the machine casing.

3 . The system as claimed in claim 2 , wherein all or part of said inner ducts are produced in such a way as to provide the circulation of the coolant in planes perpendicular to an axis of the primary machine.

4 . The system as claimed in claim 3 , wherein the frequency converter comprises a converter casing, wherein the primary casing comprises ducts formed in a segment of said primary casing coming into contact with the converter casing, said ducts forming part of the cooling circuit.

5 . The system as claimed in claim 2 , wherein the frequency converter comprises a converter casing, and wherein the primary casing and the converter casing are secured to one another, the cooling circuit comprising ducts positioned between the primary casing and the converter casing.

6 . The system as claimed in claim 1 , wherein the primary machine is an electric motor.

7 . The system as claimed in claim 6 , wherein the primary machine is an axial flux electric motor.

8 . The system as claimed in claim 1 , wherein the hydraulic machine is a hydraulic pump or a hydraulic motor adapted for operating by means of a work fluid, which enters the hydraulic machine at a first pressure and exits it at a second pressure, distinct from the first pressure.

9 . The system as claimed in claim 1 , wherein the assembly casing comprises means for attaching to a support, said attaching means being equipped with shock-absorbing elements.