Patent ID: 6979917

Claim:
A permanent-magnetically excited electric machine comprising a stator part ( 2 ) and a moving part ( 30 ) movable relative to the stator part ( 2 ), as well as an air gap ( 8 ) between the stator part ( 2 ) and the moving part ( 30 ), with one of said stator part ( 2 ) and said moving part ( 30 ) having a flux path assembly for magnetic flux and winding coils ( 6 ) and the other one of said stator part ( 2 ) and said moving part ( 30 ) having a flux path assembly for magnetic flux and permanent magnets ( 36 ), and in which in the region of the flux path assembly of the stator part ( 2 ) and/or of the moving part ( 30 ), there is provided at least one filling space ( 12 ; 16 ; 20 ; 38 ; 46 ; 48 ; 50 ) for receiving flux conduction liquid ( 18 ) that is conductive for magnetic flux, characterized in that, for changing the magnetic flux conductivity of the flux path assembly, the quantity of the flux conduction liquid ( 18 ) in the filling space ( 12 ; 16 ; 20 ; 38 ; 46 ; 48 ; 50 ) may be changed during operation of the machine in dependency on the rotational speed of the machine.