Abstract: The present invention relates to an air-cooled generator, through which cooling air flows for the removal of heat loss, wherein the cooling air sweeps over boundary surfaces (23) acting as cooling surfaces and, in so doing, absorbs heat from these boundary surfaces (23). The heat transfer is maximized with minimal cooling air consumption since the boundary surfaces (23) are provided with distributed local elevations (24) enlarging the cooling surface and the heat transfer coefficient. In particular, local elevations in the form of pyramid-shaped or truncated-pyramid-shaped bodies (24, 26, 29) are preferred.

Abstract: This electricity producing installation (1) includes electricity producing devices (14, 16, 18, 20) at least partly immersed in water, each electricity producing device comprising a rotary mechanical receiver and an alternator (22) comprising at least one rotor (23) and at least one stator (24), a rotor of the alternator being able to be set into rotation by the rotary mechanical receiver. Each electricity producing device (14, 16, 18, 20) produces an electric AC signal with variable voltage and frequency conveyed by an at least partly immersed electric transport cable (32, 36, 38, 40). The installation further comprises an interconnection device (34) to which are connected at the input in parallel electric transport cables (32, 36, 38, 40) and which provide at the output a joint electric signal (S?) with variable frequency and voltage, the current amplitude of which is equal to the sum of the input currents.

Abstract: A rotating electrical machine is presented and includes a rotor, rotatable about an axis and is surrounded concentrically by a stator and has a hollow cylindrical rotor laminated core, which includes a layered lamination stack made up of a multiplicity of ring-section-shaped lamination segments which are acted upon by a pressing plate in order to distribute the pressure and are clamped by bolts which pass in an axial direction through the rotor laminated core, and which engages with a concentric central body of the rotor by means of axial slots on the internal radius of the rotor laminated core in order to transmit torque. The machine also includes slots formed in each case by pairs of radially inwardly aligned cams which are arranged on the internal radius of the lamination segments and are separated from one another by the width of the slot.