Electric machine with an induction rotor
To attenuate the parasitic air-gap fields of an electric machine, various measures are carried out on the stator ( 3 ) and/or rotor ( 7 ).
1 . An electrical machine, having a stator ( 3 ) with a winding system ( 6 ) and a rotor ( 7 ), with the stator ( 3 ) and/or the rotor ( 7 ) having means to damp or to eliminate airgap fields which can be predetermined.
2 . The electrical machine as claimed in claim 1 , characterized in that the stator ( 3 ) has a fractional tooth pitch.
3 . The electrical machine as claimed in claim 1 or 2 , characterized in that the rotor ( 7 ) has at least two squirrel cages ( 8 , 9 ) which are electrically isolated from one another.
4 . The electrical machine as claimed in claim 3 , characterized in that the squirrel cages ( 8 , 9 , 10 ) of the rotor ( 7 ) are offset through 360°/n electrical, where n is the number of isolated squirrel cages ( 8 , 9 , 10 ).
5 . The electrical machine as claimed in one of the preceding claims, characterized in that the slots in the stator ( 3 ) and/or rotor ( 7 ) have additional inclinations which can be predetermined.
6 . The electrical machine as claimed in one of the preceding claims, characterized in that the rotor ( 7 ) has slots N 2 which do not contain any conductors or whose conductors ( 11 ) are not connected to the squirrel cages ( 8 , 9 , 10 ).
7 . The use of an electrical machine as claimed in one or more of the preceding claims for production machines or drives for electric vehicles.