Abstract
The value of the aerodynamics noise generated from the inside of a traction motor was computed at the position 1m apart from the outside of a traction motor with the aid of the general-purpose heat fluid analysis software. This calculation results showed a tendency of frequency spectrum the actual one. In this calculation, it was shown that the sound power level in decibels grew large in the vicinity of the entrance of the cooling duct inside the rotator of the traction motor. The acoustical countermeasure against the noise from the cooling duct was taken by rounding off the edges in the vicinity of the cooling duct entrance. The effect of the acoustical countermeasure against the noise and the effect of the noise of the cooling fan inside and outside of a traction motor were verified by simulating the sound pressure change. These analytical results are reported in this paper.
