SCREENING SYSTEM FOR MAGNETIC ROTARY-ENCODER SENSOR SYSTEM

It is disclosed a screening system (72) for a magnetic rotary-encoder sensor system (22) in an environment (12) of a machine (16) including a magnetic noise field (14), wherein the rotary-encoder sensor system (22) comprises a magnetic sensor (24), a pole wheel (26), and preferably a pole-wheel carrier (32), wherein the pole wheel (26) comprises in a circumferential direction (U) a plurality of permanent magnets (28) of alternating magnetic polarity generating a useful field, wherein the pole-wheel carrier (32) is configured to be mounted in a rotationally-fixed manner to a rotating machine shaft (30) extending axially, rotational speed and/or angular position of which is to be determined by means of the rotary-encoder sensor system (22), wherein the magnetic sensor (24) is positioned, in a mounted state of the rotary-encoder sensor system (22) relative to the machine shaft (30), in a rotational plane (36) of the pole wheel (26), which can affect the noise field, and directly opposite to the pole wheel (26), wherein the screening system (72) comprises at least one magnetically conducting, preferably machine-fixed, deflection element (74) being formed and dimensioned such that in the mounted state a measuring volume (76), which is substantially free of the noise field, is established, to which the magnetic sensor (24) and such ones of the permanent magnets (28) are at least adjacent which are required for generating an evaluable useful field (38), when the noise field (14) is active.