ROTATION ANGLE DETECTION DEVICE AND ROTATION ANGLE CORRECTION METHOD

摘要

A device for detecting an absolute rotation angle of multiple rotation with a high accuracy and high resolution by using a target connected to the rotation axis and having an outer circumferential surface to which magnetic poles of alternate polarities are magnetized. The device includes: first rotor (101) holding target (103) connected to input axis (102) and having an outer circumferential surface to which magnetic poles of alternate polarities are magnetized at an identical interval and having a multi-rotatable gear; second rotor (108) connected to the gear of first rotor (101), rotated at a low speed by first rotor (101), and having magnet (109) at the center portion; first detection unit (110) and second detection unit (111) for detecting the rotation angles of them. With a simple configuration, it is possible to detect an absolution rotation angle with a high accuracy and a high resolution.