Rotary compressor

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A rotary compressor is driven by an engine or electric motor (with electric motors being the most common), while the other rotor (also known as the female rotor or concave rotor) is driven by an oil film created by oil injection from the main rotor, or by synchronous gears at the ends of the main rotor and the female rotor. The compressor cylinder contains a pair of intermeshing helical male and female rotors; both rotors have several concave teeth, and they rotate in opposite directions. The gap between the rotors and between the casing and the rotors is only 5–10 microns. The main rotor (also known as the male rotor or convex rotor) is driven by an engine or electric motor (with electric motors being the most common). The other rotor (also known as the female rotor or concave rotor) is driven either by an oil film created by oil injection from the main rotor, or by synchronous gears at the ends of the main rotor and the female rotor. Therefore, there is no metal contact in the drive (theoretically).