ROTATION ANGLE DETECTION DEVICE

摘要

An output signal V1 = sin ? is output from a first magnetic sensor (11), and an output signal V2 = cos (? + a) is output from a second magnetic sensor (12). An output signal correction unit (22) in a rotation angle computing device (20) corrects the output signal V2 from the second magnetic sensor (12) to an output signal V2' (= cos ?) so that the arrangement phase difference (90O + a) between the magnetic sensors (11, 12) may become a target phase difference of 90O. A rotation angle computing unit (23) computes the rotation angle ? of a rotor (1) on the basis of the corrected signal V2' (= cos ?) and the output signal V1 (=sin ?) from the first magnetic sensor (11).