Fan for rotating electric machine
AssigneeValeo Equipements Electriques Moteur
InventorClaudiu Vasilescu
Life of this patent
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Abstract
The rotating electrical machine comprises at least one fan (43) provided with blades forming between them ventilation channels (48) which diverge and are suitable for producing a flow of cooling fluid through the machine; the angle of incidence (B) of the blades at the level of the leading edge is between 150° and 175°, while 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 (C) generated during the rotation of the blades; the ratio of the mean pitch of the blades (46) to the mean length of the latter being less than 0.975. Application to fans for a motor-vehicle alternator.
Claims13
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.
Machine according to claim claim [sic] 6, characterised in that the height of at least some of the blades of the first and second sets of blades (46, 52) decreases from the inner periphery towards the outer periphery.
Dependencies are inferred from the claim text.