| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a rotation angle detection device which miniaturizes the device and reduce an influence of a noise.SOLUTION: A magnetic type rotation angle detection device 1 for detecting an absolute rotation angle of a rotating body 2 includes: distance detection units 6 arranged at opposing positions on an inclined plane 4 of the rotating body 2 or a passive member 3 in a non-contact state, for detecting a distance to the inclined plane 4 which continuously changes according to a rotation of the rotating body 2; and an angle specifying unit 7 for specifying the absolute rotation angle of the rotating body 2 based on the detected distance by the distance detection units 6. The distance detection unit 6 each includes a detection coil 9 for detecting a distance to the inclined plane 4 as a change in inductance. The angle specifying unit 7 specifies the absolute rotation angle of the rotating body 2 based on a phase shift of an AC-exciting wave generated in response to the inductance change of the detection coil 9 while AC-exciting the detection coil 9 when the absolute rotation angle of the rotating body 2 is specified based on the inductance change of the detection coil 9.</p> |
