VENTILATOR UNIT FOR INTERNAL-COMBUSTION ENGINES OF AUTOMOTIVE VEHICLES

1. A fan unit for cooling the internal combustion engine of an automobile vehicle comprising a fan propeller (1) and an electric motor device (8; 10; 10A) supplied with current by a DC source through an electronic circuit (15; 15A; 16 to 21) generating periodic signals, this motor comprising an annular stator (8) provided with field coils (14) and a rotor (10; 10A) having a hub (3) and an outer annular body of a ferromagnetic material comprising on its outer periphery permanent magnets (12; 22) having alternating polarities, and adapted to cooperate electrically with the coils of the stator and connected to rotate with the hub through the medium of the blades (2) of said propeller (1), in which unit the outer annular body of the rotor (10; 10A) is formed by a nozzle for guiding the air flow, this nozzle extending axially and having on its outer periphery said permanent magnets (12; 22) cooperating with said stator (8), said electric motor is of the DC autosynchronous type and the propeller (1) formed by said blades (2) is of the stream-line type whose profile only produces the detachment of the streams of air of the flow driving the propeller at the trailing edge of these blades.