NOVELTY - The rotor assembly has a rotor (150) and an input shaft machined as an integral unit. The rotor is positioned between two end plates (151a,151b). A liner is positioned between each end plate and the rotor. The liner may include a ceramic disk or may be formed of polytetrafluoroethylene.    USE - Rotor assembly for rotary compressor (claimed) for compressing gases under pressure. Can also be used for any rotary fluidic device such as a vacuum pump, an expander for high pressure gases e.g. steam, or a flowmeter, part of a refrigeration assembly or a fluid power assembly, as well as for a compressor stage of a turbine engine, a supercharger for an internal combustion engine, an air feed compressor for a fuel cell package, or a waste heat recovery device when adapted to a bottoming cycle for existing thermodynamic operations.    ADVANTAGE - The rotary compressor does not rely on fixed cycle phases, eccentric shafts that induce friction, and problematic compression chamber sizes, enabling to efficiently compress fluid such as liquid or gas for a given energy input while realizing a lighter construction and improved output per cubic inch of overall size. The compressor can be utilized as the compressor stage of the turbine engine to achieve high pressure ratios within a small package, or as an air feed compressor to supply high volumes of air at relatively low pressures. The intake tract of the compressor can have low turbulence during intake chamber filling, reducing turbulence losses and improving volumetric efficiency. The rotational components of the compressor can be used to pump oil and or coolant without need for auxiliary pumps, simplifying overall mechanical design. The compressor also does not require an eccentric shaft, resulting in lower frictional losses and providing a more direct conversion of the energy needed to rotate the shaft into compressed gas or liquid. By improving dimensions of each component of the rotor assembly to the sub-micron range, compressor performance may be improved.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a rotary compressor.    DESCRIPTION OF DRAWING(S) - The drawing shows the exploded side view of a rotor assembly including end plates, a rotor, and rotor front and back bearings.    Rotor (150)    End plates (151a,151b)    Rotor front bearing (152)    Rotor back bearing (153)    Bore (156)