Rotating electrical machine for vehicles with liquid cooling

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 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;
• and
• 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;
• the electrical machine is characterized in that each distribution chamber has a plurality of outlet through holes, which are arranged in a radial fashion and open through an inner wall of the distribution chamber in order to lead to the central rotation axis.