| 摘要 |
A magnet (20, 20a, 40, 40a, 50, 50a) for a rotation angle sensor that is used for a rotation angle sensor for measuring a rotation angle &thetas;r is annular, with N-poles and S-poles arranged alternately in the circumferential direction, and has regions (22a to 22h, 25a to 25h, 42a to 42h, 44a to 44h, 52a to 52h, 54a to 54h) where a magnetic flux is not produced, between the magnetic poles of the N-poles and S-poles in an inner edge (21), outer edge (41), or axial end surface (51). The rotation angle sensor is provided with the magnet (20, 20a, 20b, 40, 40a, 50, 50a) for the rotation angle sensor and with a magnetic vector detection unit (11) for detecting a magnetic vector &thetas;s, and the rotation angle sensor measures the rotation angle &thetas;r of a detection subject (30). |
