Patent ID: 6844638

Claim:
Rotating electrical machine comprising a rotor ( 16 ) provided with pole wheels ( 20 , 22 ), each equipped with teeth ( 120 ), at least one fan ( 43 ) firmly attached to the rotor ( 16 ) and provided with a number of blades ( 46 ) higher than that of the teeth ( 120 ) of each pole wheel ( 20 , 22 ), the blades ( 46 ) forming between them ventilation channels ( 48 ) which diverge and are suitable for producing a flow of cooling fluid through the machine, characterised in that the angle of incidence (B) of the blades at the level of the leading edge is between 150° and 175°, in that the angle of incidence (A) of the blades at the level of the trailing edge is between 90° and 165° relative to the tangent to a circle generated during the rotation of the blades, and in that the ratio of the mean pitch of the blades ( 46 ) to the mean length of the latter is less than 0.975.