Misalignment of a rotary shaft (20a) in a radial direction is detected based on the signals of magnetic sensors (Ss1, Sc1, Ss2, Sc2) that are arranged so as to oppose a magnet part (210) provided to rotate integrally with the shaft and magnetized so that a position of an area magnetized as an N pole and a position of an area magnetized as an S pole are alternately switched as the rotary shaft (20a) rotates. Shaft misalignment is detected either based on the difference between two rotation angle values determined based on two respective pairs (Ss1 and Sc1; Ss2 and Sc2) of magnetic sensors, each sensor pair being shifted from one another by À/2, or based on a misalignment amount calculated from two inclination angle values determined on the basis of two respective pairs (Ss1 and Ss2; Sc1 and Sc2) of magnetic sensors, each sensor pair being shifted from one another by À. When the angular difference or the misalignment amount is larger than a threshold, the occurrence of shaft misalignment is detected and a corresponding information (F) is output.


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    Title :

    ROTATIONAL-ANGLE DETECTION DEVICE AND ELECTRIC POWER-STEERING DEVICE PROVIDED WITH ROTATIONAL-ANGLE DETECTION DEVICE


    Additional title:

    DREHWINKELERKENNUNGSVORRICHTUNG UND ELEKTRISCHE LENKVORRICHTUNG MIT DER DREHWINKELERKENNUNGSVORRICHTUNG
    DISPOSITIF DE DÉTECTION D'ANGLE DE ROTATION ET DISPOSITIF DE SERVO-DIRECTION ÉLECTRIQUE POURVU D'UN TEL DISPOSITIF


    Contributors:

    Publication date :

    2017-12-27


    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 / G01B MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS , Messen der Länge, der Dicke oder ähnlicher linearer Abmessungen