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Rotation angle detection apparatus having function of detecting entry of foreign substance based on frequency characteristic of signals

  • US 10,066,971 B2
  • Filed: 08/29/2016
  • Issued: 09/04/2018
  • Est. Priority Date: 08/31/2015
  • Status: Active Grant
First Claim
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1. A rotation angle detection apparatus comprising:

  • a rotator and a track, the rotator configured to rotate the track around a rotation axis;

    a detector disposed in correspondence with the track; and

    a processor configured to;

    calculate a rotation angle of a rotation axis based on signals generated by the detector;

    calculate the rotation speed of the rotation axis based on the signals; and

    detect an abnormality based on the signals, by;

    calculating a frequency characteristic of the signals;

    storing the signals generated from the track per revolution of the rotator;

    calculating a signal frequency that is the product of the stored signals and the calculated rotation speed; and

    detecting the abnormality, when the frequency characteristic includes a component of a higher order than the signal frequency.

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