Patent ID: 8049377

Claim:
A hydrogen cooled generator having an axis and a plurality of phases, the plurality of phases including more than three phases, the generator comprising: a main casing section enclosing a stator with windings; a casing end section; at least one end winding of the stator windings disposed in the casing end section; a toroidal duct having a bottom wall and two side walls, wherein at least one of the bottom wall and the two side walls shares a wall of the casing end section so as to form a common wall; at least one bushing penetrating the common wall and inclined towards the axis of the generator, the at least one bushing having a first end connected to the at least one end winding and a second end terminating in the toroidal duct; a frequency adaptation unit disposed in the toroidal duct, including at least one rectifier portion having an input end connected to the second end of a respective one of the at least one bushing; and a positive polarity collection ring and a negative polarity collection ring, each ring being connected to an output end of a respective one of the at least one rectifier portion, wherein the at least one rectifier portion forms a rectifying bridge between the plurality of phases and the positive and the negative polarity collection rings, further comprising a cooling water system configured to water-cool the at least one rectifier portion within the toroidal duct.