Rotating electrical machine for vehicles with liquid cooling

摘要

An embodiment of a rotating electrical machine has: a shaft rotatably mounted to rotate around a central rotation axis; a rotor carried by the shaft; a stator which supports stator windings and is arranged around the rotor to enclose the rotor therein; a cylindrical casing which encloses the stator therein; and a cooling circuit which is intended for the circulation of a cooling fluid, is obtained at the casing, has a single common inlet opening for the cooling fluid axially arranged in the centre of a lateral wall of the casing, and two helicoidal paths, each of which is a mirror-image twin of the other one, centrally originates from the common inlet opening and extends from the centre of the casing towards a corresponding end of the casing.

主权项

1. A rotating electrical machine comprising:
a shaft, which is mounted so as to rotate around a central rotation axis; a rotor, which is supported by the shaft; a stator, which supports stator windings provided with heads and is arranged around the rotor so as to surround the rotor; a cylindrical casing, which contains in its inside the stator; a cooling circuit, which is intended for the circulation of a cooling fluid and is obtained at the casing, has a single common inlet opening for letting the cooling fluid in, which is axially arranged at the center of a lateral wall of the casing, and has two helicoidal paths, each of which is a mirror-image twin of the other one, centrally originates from the common inlet opening and extends from the center of the casing towards a corresponding end of the casing; two annular distribution chambers, each of which has a circular shape, is arranged at an end of the casing and forms the end of a corresponding helicoidal path; and two collecting chambers, in which the heads of the stator windings are arranged: wherein each annular distribution chamber has a plurality of outlet through holes, which are arranged in a radial fashion, open through an inner wall of the annular distribution chamber in order to lead to the central rotation axis, and establish a communication between each distribution chamber and a corresponding collecting chamber.