A rotating electrical machine, in particular to an alternator (A) or to an alternator-starter, for a motor vehicle, comprising: a rotor (2) supporting a front fan (23) at the front and a rear fan (24) at the rear, the rotor being rotatable about an axis of rotation, a stator (4) comprising a stator body and at least one winding placed on the stator body, the winding forming front and rear chignons on either side of the stator body, and a casing (1) in which the stator and the rotor are placed.