An electric traction motor for a vehicle, the motor comprising: • a stator; • a rotor, which is designed to be rotated at a speed w3 greater than 5000 revolutions per minute, relative to the stator, around a main axis of the motor, under the effect of an electrical power supply to the motor; • a fan, which is designed to be rotated relative to the stator, around the main axis, at a speed w5, to ventilate the motor; • a magnetic gearbox, via which the rotor drives the fan in rotation, the magnetic gearbox being designed to transmit the rotation of the rotor to the fan with a reduction ratio [Math 5] R = w5/w3; in which • an absolute value of the reduction ratio R is less than or equal to 0.85, preferably equal to about 0.5; • the magnetic gearbox comprises-: ◆ an inner ring, which is fixed relative to the rotor, comprising a multitude of separate permanent magnets, which are distributed around the main axis and constitute a number of pole pairs p1, ◆ an intermediate ring comprising a number n2 of separate ferromagnetic parts distributed around the main axis, and ◆ an outer ring, which comprises a multitude of separate permanent magnets, distributed around the main axis, which constitute several pole pairs p3-; • a stator ring, chosen from the intermediate ring and the outer ring, is fixed relative to the stator; • a driving ring, chosen from the intermediate ring and the outer ring, while being distinct from the stator ring, is fixed with respect to the fan; • the stator comprises: ◆ a housing through which the rotor passes along the main axis and which contains a field winding and an armature belonging to the motor, and ◆ a flange, attached to the housing, which provides an air circulation opening through which the main axis passes; and • the fan is placed outside the casing, between said casing and the flange, along the main axis, and is configured to circulate ventilation air through the air circulation opening to ventilate the motor; • the magnetic gearbox is arranged between the fan and the flange along the main axis; and • the stator ring gear is fixed relative to the stator and is attached to the stator by means of the flange. • a stator; • a rotor, which is designed to be rotated at a speed w3 greater than 5000 revolutions per minute, relative to the stator, around a main axis of the motor, under the effect of an electrical power supply to the motor; • a fan, which is designed to be rotated relative to the stator, around the main axis, at a speed w5, to ventilate the motor; • a magnetic gearbox, via which the rotor drives the fan in rotation, the magnetic gearbox being designed to transmit the rotation of the rotor to the fan with a reduction ratio [Math 5] R = w5/w3; • an absolute value of the reduction ratio R is less than or equal to 0.85, preferably equal to about 0.5; • the magnetic gearbox comprises-: ◆ an inner ring, which is fixed relative to the rotor, comprising a multitude of separate permanent magnets, which are distributed around the main axis and constitute a number of pole pairs p1, ◆ an intermediate ring comprising a number n2 of separate ferromagnetic parts distributed around the main axis, and ◆ an outer ring, which comprises a multitude of separate permanent magnets, distributed around the main axis, which constitute several pole pairs p3-; ◆ an inner ring, which is fixed relative to the rotor, comprising a multitude of separate permanent magnets, which are distributed around the main axis and constitute a number of pole pairs p1, ◆ an intermediate ring comprising a number n2 of separate ferromagnetic parts distributed around the main axis, and ◆ an outer ring, which comprises a multitude of separate permanent magnets, distributed around the main axis, which constitute several pole pairs p3-; • a stator ring, chosen from the intermediate ring and the outer ring, is fixed relative to the stator; • a driving ring, chosen from the intermediate ring and the outer ring, while being distinct from the stator ring, is fixed with respect to the fan; • the stator comprises: ◆ a housing through which the rotor passes along the main axis and which contains a field winding and an armature belonging to the motor, and ◆ a flange, attached to the housing, which provides an air circulation opening through which the main axis passes; and ◆ a housing through which the rotor passes along the main axis and which contains a field winding and an armature belonging to the motor, and ◆ a flange, attached to the housing, which provides an air circulation opening through which the main axis passes; and • the fan is placed outside the casing, between said casing and the flange, along the main axis, and is configured to circulate ventilation air through the air circulation opening to ventilate the motor; • the magnetic gearbox is arranged between the fan and the flange along the main axis; and • the stator ring gear is fixed relative to the stator and is attached to the stator by means of the flange.