| 摘要 |
According to one embodiment, a traction motor includes a stator core, a rotor core, a first bearing, a second bearing, a rotor shaft, a first ventilation passage made at an outer circumference portion of the stator core, a first fan, and a second ventilation passage to introduce external air. And, in the motor, a first minute gap is provided between an end portion of a first fan main plate and an inner circumference portion of the first bracket, cooling wind is discharged to the motor outside via the second ventilation passage, an outer circumference portion of the first fan, a ventilation portion in the first bracket and the first ventilation passage, and the second ventilation passage is made so that the cooling wind entered from the first air intake port flows around the rotor shaft portion between the first ventilation fan and the first bearing. |
