ANGLE SENSOR, A BEARING UNIT, ELECTRICAL MOTOR, A CONTROL SYSTEM AND ERROR-CHECK SYSTEM

An angle sensor (110) is provided for determining an absolute angle signal of a first part rotated with respect to a second part. The angle sensor comprises a first grating ring (345) for generating a first signal (Al) representative of a relative position of a first sensor (355) along a corresponding ring segment of the first grating ring. The angle sensor (110) further comprises a second grating ring (340) for generating a second signal (A2) representative of a relative position of a second sensor along the corresponding ring segment of the second grating ring. The first plurality and the second plurality are co-prime numbers and a difference between the first plurality and the second plurality being larger than 1. The angle sensor also comprises a calculator (102) configured for calculating the absolute angle signal (AA) using a first linear combination of the first signal (A1) and the second signal (A2).