PUMP GROUP

The invention is a pump group (1) fluidically connectable to a cooling system for an operating group, such as, for example, an internal combustion engine, an electric motor or a battery group of a vehicle. The pump group (1) comprises an impeller (2) and a shaft (3) on which the impeller (2) is integrally mounted. The pump group (1) comprises an electric motor (4) comprising a rotor (41) integrally mounted on the shaft (3) and a stator (42). Furthermore, the pump group (1) comprises an electronic command board (5) connected to the electric motor (4). Furthermore, the pump group (1) comprises a pump body (6) comprising: a first casing (61) in which the impeller (2) is housed; a second casing (62) comprising an intermediate tubular wall (625) positioned between the rotor (41) and the stator (42) in such a way as to define in the motor chamber (620) a rotor chamber (621) and a stator chamber (622) mutually separated and fluid-tightly sealed; a third casing (63) in which the electronic command board (5) is housed in a command chamber (630). The pump group (1) object of the present invention contains an amount of oil in the stator chamber (622) and the command chamber (630) which cools the stator (42) and the electronic command board (5) by convection, in which the command chamber (630) and the stator chamber (622) are separated by a second separating wall (623) comprising at least one connecting opening (623') which fluidically connects them.