Patent ID: 8807971

Claim:
A turbo compressor for air, comprising a compressor housing and an impeller arranged in the compressor housing as well as a drive motor with a stator and a rotor, the impeller being seated on a rotor shaft, the drive motor being cooled with a flow of cooling air by way of a closed cooling air circuit and the flow of cooling air in the cooling air circuit flows through at least one cooling bore penetrating a section of the rotor shaft, the flow of cooling air conveyed in the cooling air circuit flowing on an impeller underside in a radial direction to the rotor axis from an area located radially inwards to an area of the impeller underside located radially outwards, the flow of cooling air flowing through a gap between the impeller underside and a compressor housing base plate of the compressor housing facing it, wherein when reaching the area of the impeller located radially outwards the flow of cooling air enters receiving openings in the compressor housing base plate arranged around the rotor shaft and flows through ducts into a collecting duct.