Compressed air driven inverter generator

A hub assembly for use in a compressed air driven inverter generator, the hub assembly comprising:

• a hub comprising a plate with a cylindrical protrusion centered on a bottom face and a bore hole through the center of the plate and the cylindrical protrusion, the cylindrical protrusion sized to fit into an inner bore hole of a stator and the bore hole of the hub sized to fit around without contacting an output shaft of an air motor of the generator, the plate also having a trench on a bottom face, the trench forming a closed loop, a plurality of cooling ports through the hub evenly spaced in the trench and a plurality of mounting holes though the plate, and a socket on a top face opposite the bottom face, the socket being concentric with the bore hole of the hub and sized to fit around the exterior of the air motor;
• a diffuser plate configured to attach to the bottom face of the hub with a plurality of air holes extending through the diffuser plate, the air holes having a same radius as a centre of the trench, the plate and the diffuser plate when assembled forming a 360 degree enclosed air channel;
• a hub spacer in contact with a side of the diffuser plate opposite the hub.