Electrical machine with a rotor bearing that is integrated inside the stator

Abstract

The invention relates to an electrical machine and a method for assembling an electrical machine. The electrical machine includes a stator ( 1 ), which is received in a housing. The housing is closed by a housing cap ( 12 ). The electrical machine further includes a rotor ( 7 ), which includes a shaft ( 5 ) that is rotatably received in roller bearings ( 4 ). The roller bearings ( 4 ) are received by bearing rings ( 2 ), which are supported in the stator ( 1 ) of the electrical machine.

1 . An electrical machine, having a stator ( 1 ) which is received in a housing that is closed by a housing cap, and having a rotor ( 7 ) that includes a shaft ( 5 ) which is rotatably received in roller bearings ( 4 ), characterized in that the roller bearings ( 4 ) are received by bearing rings ( 2 ), which are supported in the stator ( 1 ) of the electrical machine.  
   
   
       2 . The electrical machine according to  claim 1 , characterized in that the stator ( 1 ) is provided on its face ends with openings ( 20 ,  28 ,  29 ) for receiving the bearing rings ( 2 ).  
   
   
       3 . The electrical machine according to  claim 1 , characterized in that the bearing rings ( 2 ) are made from a nonmagnetic material.  
   
   
       4 . The electrical machine according to  claim 1 , characterized in that bearing insulations ( 14 ) are located between the roller bearings ( 4 ) and a short-circuit ring ( 8 . 1 ) of the rotor ( 7 ).  
   
   
       5 . The electrical machine according to  claim 4 , characterized in that the bearing insulation ( 14 ) is embodied as an expansion ring and is located in the region of an inner ring ( 24 ) of the roller bearing ( 4 ).  
   
   
       6 . The electrical machine according to  claim 1 , characterized in that the roller bearings ( 4 ) have inner rings ( 24 ) which have nonelectrically conductive running faces for roller bodies ( 23 ).  
   
   
       7 . The electrical machine according to  claim 1 , characterized in that a short-circuit ring ( 8 . 1 ), acting as a bearing seat ( 31 ), is press-fitted into the inner ring ( 24 ) of the roller bearing ( 4 ).  
   
   
       8 . A method for assembly of an electrical machine of  claim 1 , characterized in that the countersunk features ( 20 ,  28 ,  29 ) on the stator ( 1 ) are embodied when the winding lamination packets are created in the stator ( 1 ), during the stamping process, in the face ends of the stator ( 1 ).  
   
   
       9 . The method according to  claim 8 , characterized in that roller bearings ( 4 ) are joined to the bearing rings ( 2 ) before the bearing rings ( 2 ) are press-fitted into the countersunk features ( 20 ,  28 ,  29 ) on the face ends of the stator ( 1 ).  
   
   
       10 . The method according to  claim 8 , characterized in that upon fitting of the rotor ( 7 ) into the stator ( 1 ), a short-circuit ring ( 8 . 1 ) is press-fitted as a bearing seat into the inner ring ( 24 ) of the roller bearing ( 4 ).  
   
   
       11 . The method according to  claim 8 , characterized in that an expansion ring ( 30 ) is injection molded in the region of the inner ring ( 24 ) of the roller bearing ( 4 ).