This invention concerns a capacitive sensor for a rotation angle with a first stator (2) which has a plurality of electrically conductive, mutually insulated electrodes (5i) in the form of annular sectors with a predetermined central angle, with a second stator (4) arranged parallel to the first stator which has a receiving electrode (6), and with a rotor (3) mounted on a shaft (7) which can rotate about an axis. Said rotor (3) has at least one sector-shaped blade (8a, 8b) arranged normal to the rotational axis and parallel to and between the first and the second stators. The sum of the central angles of all transmitting electrodes is less than 2 pi (360 DEG ), preferably ranging from pi /12 (30 DEG ) to 5 pi /6 (300 DEG ), and the central angle of each rotor blade is essentially equal to the sum of the central angles of n adjacent transmitting electrodes. At least one of the stators has a recess (2a) open toward its boundary which makes radial introduction of the shaft (7) into the axis region possible during assembly together with the rotor, so that the central angle of this stator (2) is less than 360 DEG and the central angle of the electrode (6) of the second stator (4) is essentially equal to the sum of the central angles of all the electrodes of the first stator (2).
|Translated title of the contribution||CAPACITIVE SENSOR FOR ROTATION ANGLE AND ANGULAR VELOCITY, AND MEASURING DEVICE FOR SAME|
|IPC||G01D 5/ 241 A I|
|Publication status||Published - 1 Oct 1998|