Abstract: A device cools a power train of a vehicle including an electric machine with a wound rotor coupled to a speed reducer. The device includes: an oil cooling circuit for cooling the electric machine, the circuit include a heat exchanger connected to an oil tank and a water circuit that connects members of the power train through the radiator of the vehicle; a temperature adjuster of the oil flow supplied at the outlet of the exchanger to a distribution circuit projecting the oil to elements for heating the electric machine; a circuit for lubricating the reducer, the circuit including a sump, the bottom of the sump forming a reserve of oil for lubricating the reducer; and a bypass channel at the outlet of the exchanger, for conveying a portion of the temperature-adjusted oil in contact with the bottom of the sump in order to cool the oil reserve.

Abstract: A cooling system cools an electric machine including a casing, a rotor rotatably supported by the casing, and a stator fixed to the casing. The cooling system includes a flow circuit that brings a cooling liquid into contact with active parts of the electric machine. A main reservoir is provided in a lower portion of the casing. A pump injects the cooling liquid into the flow circuit. The level of cooling liquid in the casing interfaces with a lower portion of the rotor when the pump stops. A controller controls the pump to stop the pump when a temperature of the cooling liquid is below a given threshold, and start the pump as soon as the temperature of the liquid reaches the threshold such that the liquid is drawn by the main reservoir pump towards a secondary reservoir to lower the level of cooling liquid in the casing.

Abstract: A device cools a power train of a vehicle including an electric machine with a wound rotor coupled to a speed reducer. The device includes: an oil cooling circuit for cooling the electric machine, the circuit include a heat exchanger connected to an oil tank and a water circuit that connects members of the power train through the radiator of the vehicle; a temperature adjuster of the oil flow supplied at the outlet of the exchanger to a distribution circuit projecting the oil to elements for heating the electric machine; a circuit for lubricating the reducer, the circuit including a sump, the bottom of the sump forming a reserve of oil for lubricating the reducer; and a bypass channel at the outlet of the exchanger, for conveying a portion of the temperature-adjusted oil in contact with the bottom of the sump in order to cool the oil reserve.