A powered roots - compressor, which a drive shaft (2) which, by means of a motor (12) is driven, a driven shaft (3), which by means of a synchronizing gear set (7) with the drive shaft (2) is connected, wherein a pair of rotors (9, 10) in each case on the drive shaft (2) and the driven shaft (3) is fixed, in which the rotors (9, 10) are rotated, so that the compressor sucks in and working fluid, and has a housing (1), which has an inlet port and an outlet port,characterized in thatthe housing (1) a motor housing, the one motor chamber (11) for receiving of the engine, a transmission housing, which is a gear chamber (6) for receiving of the synchronously strength sodium transmission (7), and a rotor housing having a rotor chamber (8) for receiving of the pair of rotors (9, 10), and in thatat least one cooling passage the inlet port or the outlet port with the rotor chamber (8), and connects to the flow of working fluid is formed therein,the cooling passage in the..
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