Turbomachinery electric generator arrangement

A turbomachinery electric generator arrangement, comprising:

• a rotary compressor having an impeller arranged to compress gas through a primary gas outlet to a first volute of the compressor arranged around the impeller;
• a rotary armature and a stator, the stator outputting electrical energy induced by rotation of the rotary armature;
• a combustion chamber to which compressed gas is directed from the first volute of the compressor;
• a rotary turbine to which combustion product is directed from the combustion chamber;
• and
• a bearing arrangement supporting in rotation the rotary compressor, the rotary armature, and the rotary turbine;
• wherein the rotary compressor has a secondary outlet that produces cooling gas separate from the compressed gas supplied to the combustion chamber,
• wherein the cooling gas is directed from the secondary outlet to the rotary armature by a cooling path around an outer edge of the first volute of the compressor and to the rotary armature such that the cooling gas flows past the rotary armature for cooling the rotary armature, and
• wherein the cooling gas directed from the rotary compressor to the rotary armature is at a pressure lower than that of the compressed gas supplied by the rotary compressor to the combustion chamber.