Patent ID: 9742425
Date: 2017-08-22
CPC Classifications: G01D,H03M

Claim:
1. A rotation detector for detecting rotation of a rotor, based on a signal produced according to rotation of the rotor, having a waveform according to a rotational cycle thereof, comprising: a signal obtaining unit configured to select from signals produced from plural rotation detecting elements including plural sets of rotation detecting elements and individual rotation detecting elements in each set of the plural sets of the rotation detecting elements being located at different positions relative to a rotation angle of the rotor and having a same phase, two signals having different phases produced from two of the plural rotation detecting elements located farthest relative to the rotation angle of the rotor; a vector operating unit configured to determine a vector according to a rotational angle of the rotor, based on the two signals; and a rotation detecting unit configured to detect rotation of the rotor, based on the vector.