Patent ID: 6865888

Claim:
A turbo-compressor ( 20 , 121 ) for a piston combustion engine ( 10 ), comprising: a fresh air inlet ( 24 ); a fresh air outlet ( 26 ), the turbo-compressor ( 20 , 121 ) to be connected with the combustion engine ( 10 ) via the fresh air outlet ( 26 ); a transmission shaft ( 32 ) coupled with an electric machine ( 30 ) for at least one compressor wheel ( 34 ), in order to set the compressor wheel ( 34 ) in rotation by means of the electric machine ( 30 ), whereby compressed fresh air is provided at the fresh air outlet ( 26 ) for the combustion engine ( 10 ); and the electric machine ( 30 ) being a reluctance machine, characterised in that the reluctance machine ( 30 ) comprises a stator arrangement of essentially C-shaped yokes ( 50 ), wherein each of the yokes ( 50 ) comprises two free legs ( 52 , 54 ) for protruding radially inwards to at least partially cover teeth ( 42 ) arranged at faces ( 46 ) of an essentially circular cylindrical rotor ( 40 ), the teeth ( 42 ) of the rotor ( 40 ) being in alignment with the legs ( 52 , 54 ) of the yokes ( 50 ).