Cooling device for cooling a winding braid of an electrical machine and method for retrofitting the electrical machine with the cooling device

摘要

A cooling device for cooling an air-permeable winding braid of an electrical machine is provided. The cooling device includes a baffle and a fan, which is arranged for blowing a stream of cooling air substantially perpendicularly onto a first surface portion of one side of the wind braid, wherein, in the region of a second surface portion of the side of the winding braid, arranged alongside the first surface portion, the baffle is arranged substantially parallel to and that a distance from the surface of the second surface portion such that a partial stream of the stream of cooling air is formed in the channel that is formed by the baffle and the second surface portion, and so, on the side of the winding braid that is opposite from the first-mentioned side, the other partial stream of the stream of cooling air, penetrating the winding braid, flows away from the winding braid without any return flow.

主权项

1. A cooling device for cooling an air-permeable winding braid of an electrical machine, comprising:
a baffle; and a fan, which is arranged to blow a stream of cooling air substantially perpendicularly onto a first surface portion of a side of the winding braid, wherein, in the region of a second surface portion of the side of the winding braid, the second surface portion being arranged beside the first surface portion, the baffle is arranged substantially parallel to and at a distance from the surface of the second surface portion in such a way that a partial stream of the stream of cooling air is formed in a channel that is formed by the baffle and the second surface portion and therefore, on the side of the winding braid that faces away from the first-mentioned side, the other partial stream, penetrating the winding braid, of the stream of cooling air flows away from the winding braid without any return flow, and wherein the winding braid comprises an end crown connection, and the surface of the baffle is formed in such a way that the channel has a cross section minimum in the region of the end crown connection, wherein the fan comprises a fan casing, by means of which the fan is encased and in which the stream of cooling air is conveyed by the fan, and wherein the baffle comprises an inlet profile portion, which is arranged between the fan casing and the surface of the baffle facing the winding braid and widens radially outward in the direction of flow of the stream of cooling air from a flow-off edge of the fan casing, such that a partial stream of the stream of cooling air is deflected outward by the inlet profile portion and flows into the channel without transfer.