A rotary compressor for compressing a working fluid includes a housing
having an oil sump. A stationary shaft extends into the housing and
includes a longitudinal passage. The longitudinal passage has an oil
inlet in fluid communication with the oil sump. A working fluid inlet
receives the working fluid. A motor has a stator and a rotor. The rotor
is rotatably mounted on the shaft within the housing and includes an
internal compression chamber in fluid communication with the longitudinal
passage. A roller is rotatably mounted on the shaft and eccentrically
disposed within the compression chamber. The roller is coupled to the
rotor such that rotation of the rotor rotates the roller and thereby
compresses the working fluid within the compression chamber.