Abstract: An electric motor casing with forced air cooling comprising an outer cylindrical jacket and an inner cylindrical jacket arranged coaxially and radially spaced to form an annular chamber which is open at end sections thereof. The outer jacket and the inner jacket are mutually connected by a plurality of substantially radial ribs, angularly spaced from one another to define, within said annular chamber, a plurality of flow channels for the cooling air, the inner walls of these channels being adapted to make the air flow substantially laminar.

Abstract: A turbopump or the like operating machine driven by a motor includes a casing for the motor having, at one end, a supporting flange for at least one first bearing of the motor shaft and, at the other end, a structure for coupling with a casing of the turbopump. The coupling structure comprises a single coupling flange, which includes a first supporting structure for a fixed sealing element interacting with a movable sealing element associated with the motor shaft and a second supporting structure for at least one second motor shaft bearing. Such first and second supporting structures are rigidly connected to the coupling flange proximate to a central portion thereof and at adjacent positions along the motor shaft.