Compressor driveable by an electric motor

Abstract

Electric motor driveable compressor ( 1 ), in which the electric motor includes a rotor with rotor shaft ( 20 ), which acts in cooperation with a stator ( 50 ) provided in the motor housing ( 52, 56, 58, 60 ), the rotor shaft ( 20 ) being mounted on the motor housing ( 56, 58, 60 ) via at least two bearings ( 46 ) and connected fixed against rotation with the compressor wheel ( 10 ) at an axial receiving segment ( 30 ), wherein the rotating components, comprised essentially of the rotor with rotor shaft ( 20 ) and compressor wheel ( 10 ), are so designed, that their first critical bending fundamental frequency w 1 lies above the maximal operationally occurring rotation speed n max .

1 - 6 . (cancelled)  
     
     
         7 . An electric motor driveable compressor in which 
 the electric motor includes a rotor with rotor shaft, which acts in cooperation with a stator provided in the motor housing,    the rotor shaft is mounted in the motor housing via at least two bearings and is connected fixed against rotation with the compressor wheel at an axial receiving segment,    the rotating components, comprised essentially of the rotor with rotor shaft ( 20 ) and compressor wheel ( 10 ), are so designed, that their first critical bending fundamental frequency W 1  lies at least 25%, preferably 50%, above the maximal occurring operational rotation speed n max .    
     
     
         8 . A compressor according to  claim 7 , wherein for raising the fundamental frequency W 1  the rotor shaft ( 20 ) includes at least one axial segment ( 24 ,  26 ,  28 ), of which the cross sectional diameter is larger than the diameter dimensioned in accordance with conventional design criteria.  
     
     
         9 . A compressor according to  claim 8 , wherein the bearing segments ( 26 ) which are associated with the bearings ( 46 ) exhibit larger dimensioned diameter.  
     
     
         10 . A compressor according to  claim 9 , wherein the shoulder segments ( 24 ) adjacent to the bearing segments ( 26 ) exhibit larger dimensioned diameters.  
     
     
         11 . A compressor according to  claim 9 , wherein the sealing segments ( 28 ) adjacent to the bearing segments ( 26 ) exhibit a diameter, which is equal to or slightly smaller than the diameter of the bearing segments ( 26 ).  
     
     
         12 . A compressor according to  claim 7 , wherein the bearings ( 46 ) are roller bearings.