Patent ID: 9647403
Date: 2017-05-09
CPC Classifications: H01R,H02K

Claim:
1. An electrical machine ( 1 ) comprising a machine housing ( 5 ) receiving an electrically excited rotor ( 2 ) and a stator ( 10 ), wherein the rotor ( 2 ) is arranged on a rotor shaft ( 4 ) for rotation about an axis of rotation ( 19 ), and an electronics unit ( 18 ) having a housing ( 28 ) fastened to the machine housing ( 5 ) on a first end of the machine housing ( 5 ), wherein the machine housing ( 5 ) is at least partially made up of first and second bearing plates ( 6 , 7 ), in which are respectively fastened, first and second bearings ( 8 , 9 ) for bearing the rotor shaft ( 4 ), wherein the electronics unit ( 18 ) is electrically connected to an exciter winding ( 3 ) of the rotor ( 2 ) via at least one sliding contact ( 11 , 12 ), the sliding contact including at least one slip ring ( 13 , 14 ) assigned to the rotor ( 2 ) and at least two brushes ( 15 , 16 ) assigned to the electronics unit ( 18 ), the at least two brushes ( 15 , 16 ) being arranged displaceably in a brush holder ( 20 ) and spaced apart axially relative to the axis of rotation ( 19 ), wherein the brush holder ( 20 ) is fastened exchangeably in a guiding recess ( 27 ) formed in the housing ( 28 ) of the electronics unit ( 18 ) to facilitate removal of the brush holder ( 20 ) and exchange of the at least two brushes ( 15 , 16 ) without disassembly of the electronics unit ( 18 ) and without separation of the electronics unit housing ( 28 ) from the machine housing ( 5 ), wherein the brush holder ( 20 ) further comprises contacts ( 37 , 38 ), each contact ( 37 , 38 ) formed as a contact bar and having an internally-threaded nut ( 45 , 46 ) aligned with a respective cavity, the respective cavities being spaced apart in a circumferential direction of the housing ( 28 ) of the electronics unit ( 18 ), the nuts ( 45 , 46 ) being axially spaced from the at least two brushes ( 15 , 16 ), and a groove being located between the contacts ( 37 , 38 ), and wherein the electronics unit ( 18 ) is fastened to the first bearing plate ( 6 ) of the machine housing ( 5 ).