| 摘要 |
A rotational position measuring device for measuring a rotational position of a rotating shaft includes generating means for generating a sine wave signal and a cosine wave signal according to the rotational position of the rotating shaft; successive calculating means for successively calculating a sum of each square of the sine wave signal and the cosine wave signal generated by the generating means; change calculating means for calculating a change in the sums calculated by the successive calculating means; determining means for determining whether or not the change calculated by the change calculating means exceeds a predetermined value; and means for outputting a rotational position signal or an angular signal of the rotating shaft based on the sine wave signal and the cosine wave signal ; wherein an abnormality signal is outputted when the determining means determines that the calculated change exceeds the predetermined value. |
