Force vehicle change in current machine with a cooling air inlet window, which has a non-uniform opening area along the direction of rotation has

摘要

A stator (2) with energy armature winding (21) and a rotor (3) with a field winding (33) are in the event of a change in current machines housing (4) contain. A cooling blower (36) is equipped with at least one axial end of the rotor, and a plurality of windows (411) is in an axial end wall (412) of the housing, so that the windows are located opposite the cooling blower. A covering - surface (417), which is opposite the cooling blower is connected to a radial outer side of each window. The opening of the window (411) is designed in such a way that it gradually along the direction of rotation of the said cooling fan smaller, or decreases, while the covering - surface or the surface area of the cover along the same direction increases gradually. In this way, pressure changes in a space between the fan - wings (361) and the fan shroud (417) are smoothed and it is therefore possible for the noise caused by the cooling blower, can be produced effectively be reduced.