Cooling device for an electric motor stator and a manufacturing process thereof

A cooling device for a stator of an electric motor comprising:

• a first body having a first radially outer surface and a first radially inner surface extending about an axis so as to define a cavity adapted to axially receive the stator;
• a second body distinct from the first body, fixed with respect to the first body, and having a tubular shape about said axis, so as to define a pair of further surfaces coaxial about said axis, one of which adheres in contact with a corresponding one of the first radially outer surface and the first radially inner surface, while the other has one or more grooves communicating so as to form a channel for a flow of fluid for cooling the stator;
• a third body fixed with respect to the first and second bodies, as well as having a third surface extending about said axis adhering in contact with said other one of the further surfaces so that the third body forms a wall of the channel adapted to be lapped by the flow;
• wherein the channel comprises at least one portion extending so as to guide the flow according to an axial advancing direction;
• wherein said other one of the further surfaces is radially external, so that the first body is radially internal to the second body and defines a cooling jacket for the stator, so that the first radially inner surface is a heat exchange surface for making thermal contact with the stator inside the cavity.