COMPACT, HIGHLY INTEGRATED, OIL LUBRICATED ELECTRIC VACUUM COMPRESSOR

The invention relates to an electrically driven positive displacement compressor, in particular vacuum pump (1), comprising an electric drive motor (9) for driving the compressor, a working chamber (32) having an inlet (78) and an outlet (76), wherein the electric drive motor (9) comprises a ring shaped electric stator (12) and an electric rotor (16) arranged inside the ring shaped electric stator (12) and defining a cavity (24) within the electric rotor (16), and wherein the working chamber (32) is arranged at least partially inside the cavity (24) of the electric rotor (16). According to the invention a compressor rotor (36) is arranged inside the working chamber (32) and coupled to the electric rotor (16).