| 主权项 |
1. A rotation detector configured to detect a rotation reference position with respect to rotation of a rotating body having an outer peripheral part and a rotation reference part indicative of a rotation reference position in a part of the outer peripheral part, the rotation detector comprising:
a rotation detection sensor that is disposed to face the outer peripheral part of the rotating body, outputs a detection signal corresponding to a position of the outer peripheral part with the rotation of the rotating body, detects the rotation reference position with the detection of switching from the outer peripheral part to the rotation reference part on the basis of a gap to the rotating body, detects switching from the rotation reference part to the outer peripheral part, and outputs a rotation reference position signal indicative of position information of the rotation reference position at timing of the detection; and a signal processing unit that receives the detection signal and the rotation reference position signal from the rotation detection sensor, and acquires the rotation reference position on the basis of the rotation reference position signal, wherein the rotation detection sensor differentiates a pulse width of the rotation reference position signal from a pulse width of the detection signal for outputting. |
