Patent ID: 8536744

Claim:
A traction motor comprising: a rotor shaft; a stator core placed between a first bracket and a second bracket; a rotor core attached to the rotor shaft and placed on an inside of the stator core; a first bearing, placed in a bearing bracket which is attached to the first bracket, for supporting the rotor shaft so as to enable the rotor shaft to rotate; a second bearing, placed in a housing which is attached to the second bracket, for supporting the rotor shaft so as to enable the rotor shaft to rotate; a first fan attached to the rotor shaft between the rotor core and the first bearing, and attached to the rotor core or a rotor holder, wherein a plurality of first radial vanes are formed only on a surface of the first fan facing to the bearing bracket; a second fan, attached to the rotor shaft between the rotor core and the second bearing, and attached to a rotor holder; a first air passage formed in a perimeter part of the stator core; a second air passage, connected to the first air passage and formed between the first bracket and the bearing bracket, for flowing air drawn from a first air intake formed in the bearing bracket to the first air passage, wherein the first air intake is located nearer the rotor shaft compared with the first radial vanes so that the drawn air flows near the rotor shaft; and a third air passage, independent from the first and second air passages and formed between the second bracket, the housing, and the second fan, for flowing air drawn from a second intake formed in the second bracket to an outtake formed in the second bracket.