A crankcase gas separator

The present invention relates to a gas separator (1) for removing contaminants from a crankcase gas which is produced during operation of an internal combustion engine, wherein the crankcase gas separator (1) comprises a centrifugal rotor (2) with a plurality of separation discs (7) for separating the contaminants from the crankcase gas, the centrifugal rotor (2) being arranged inside a stationary rotor housing (4) having a gas inlet (5) for conducting crankcase gas to the centrifugal rotor (2) and a gas outlet (10) for discharging the cleaned crankcase gas from the centrifugal rotor (2), and an electric motor (20) which is arranged for rotation of the centrifugal rotor (2) about a rotational axis (R), characterized in that a gear device (17) is arranged between the electric motor (20) and the centrifugal rotor (2), the gear device (17) having a gear ratio arranged to increase the rotational speed of the centrifugal rotor (2) in relation to the electric motor (20).