Abstract: A wound rotor (1) has a structure defining a circumferential alternation of teeth and grooves. The teeth respectively receives longitudinal windings. The rotor (1) has longitudinal ends (17, 17?) and the windings defining, at the longitudinal ends of the rotor (1), protruding coil heads (40). A collar (10, 10?) for mechanically holding the windings is installed at one of the longitudinal ends (17, 17?) of the rotor (1) so as to define a central opening (101, 101?). A nozzle (21, 21?) projects a liquid coolant through the central opening (101, 101?) onto the coil head (40). The collar (10, 10?) has an escape duct (11, 11?) allowing escape of the liquid coolant projected onto the coil heads (40) to an outside of the collar (10, 10?). A longitudinal end of the collar (10, 10?) has a constant reduction in an outer diameter.

Abstract: The invention relates to a wound rotor (1) comprising a shaft (5) extending along a longitudinal direction (X) and a circumferential alternation of teeth and grooves, each tooth receiving a longitudinal winding intended to produce a rotor pole; each winding defining, at each longitudinal end of the rotor, a protruding coil head, said rotor (1) being capable of being cooled by a coolant projected onto said coil heads, said rotor (1) further comprising at least one collar (10, 10?) for mechanically holding said rotor windings, said collar (10, 10?) being installed at a longitudinal end (17, 17?) of the rotor (1) so as to define a central opening (101, 101?) opening out onto the coil heads, characterized in that said collar (2) has at least one escape duct (11, 11?) capable of allowing the escape of said coolant projected into the central opening (101, 101?) onto said coil heads.