A rotation detection apparatus, a rotation angle detection apparatus, and an electric power steering system are provided which allow appropriate detection of an abnormality in a portion that detects rotation of a rotating shaft. A first arithmetic circuit (51) calculates a rotating direction (D1) and a number of rotations (N1) of the rotating shaft (12a) based on a change in a combination of positivity and negativity of a first electric signal (S1) (first sine signal) and a third electric signal (S3) (first cosine signal). A second arithmetic circuit (52) calculates a rotating direction (D2) and a number of rotations (N2) of the rotating shaft (12a) based on a change in a combination of positivity and negativity of a second electric signal (second sine signal) and a fourth electric signal (second cosine signal). An abnormality determination circuit (53) determines whether each of the first and second arithmetic circuits (51) and (52) is abnormal based on the two rotating directions (D1) and (D2) calculated by the first and second arithmetic circuits (51) and (52), respectively.


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    Title :

    ROTATION DETECTION APPARATUS, ROTATION ANGLE DETECTION APPARATUS, AND ELECTRIC POWER STEERING SYSTEM


    Additional title:

    DREHNACHWEISVORRICHTUNG, DREHWINKELERFASSUNGSVORRICHTUNG UND ELEKTRISCHES SERVOLENKSYSTEM
    APPAREIL DE DÉTECTION DE ROTATION, APPAREIL DE DÉTECTION D'ANGLE DE ROTATION ET SYSTÈME ÉLECTRIQUE DE DIRECTION ASSISTÉE


    Contributors:

    Publication date :

    2016-10-05


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G01D MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE , Anzeigen oder Aufzeichnen in Verbindung mit Messen allgemein / B62D MOTOR VEHICLES , Motorfahrzeuge