Patent ID: 8797048
Filing Date: 2014-08-05
Classification: G01D,G01R

Abstract:
1. A capacitive rotation sensor for detecting the position of an object moving relative to a stationary object, comprising a shaft ( 3 ) rotatably supported in a housing flange ( 1 ), said shaft ( 3 ) being connected integral in rotation therewith to a rotor ( 5 , 6 ) to which, separated by an air gap ( 19 ) a stator ( 8 ) situated opposite thereto is assigned, wherein at least the rotor ( 5 , 6 ), the stator ( 8 ) and an evaluation circuit ( 28 ) are enclosed by an electrically conductive cap, wherein a stator surface ( 37 ) is arranged on the underside of a circuit board ( 8 ) and the stator surface ( 37 ) has assigned thereto, situated opposite thereto and separated by the air gap ( 19 ), a non-rotation-symmetrical rotor disc ( 6 ) which, in turn, is fixed on a rotor support ( 5 ), said rotor support ( 5 ) being fastened highly precisely on the outer periphery of the shaft ( 3 ) so as to be integral in rotation therewith, wherein in order to attain a highly precise arrangement that is protected against unbalance, provision is made that the eccentric rotor disc ( 5 , 6 ) consists of a copper surface that is arranged on an insulating rotor support ( 5 ).