Rotation sensor

Details Rotation sensor Rotation sensor

G - Physics

01

D

G01D 5/20 (2006.01) G01B 7/30 (2006.01) G01D 5/22 (2006.01) B62D 15/02 (2006.01) G01L 5/00 (2006.01)

Patent

CA 2373426

To provide a rotation sensor for detecting a relative rotation angle, which shows little variation in detection accuracy even in the presence of disturbances. The rotation sensor detects a variation in impedance of each of two exciting coils (12b) which is produced depending on the strength of eddy currents induced in first and second rotors (11, 13), and determines a relative rotation angle on the basis of a difference between the amounts of both variations. A first conductive layer (11a) is provided on at least one of the opposite sides of the first rotor as viewed along a rotation axis, and consists of a plurality of portions arranged in a circumferential direction of the first rotor with predetermined spaces between. The stationary core (12) is so arranged that a core body (12a) holding the two exciting coils (12b) is symmetrical with respect to a plane normal to the rotation axis. A second conductive layer (13c) is provided on an outer circumferential surface of the second rotor (13) and consists of a plurality of portions arranged in a circumferential direction of the second rotor with spaces between, wherein the spaces between the portions of the second conductive layer (13c) correspond to the spaces between the portions of the first conductive layer (11a).

L'invention porte sur un détecteur d'angle de rotation d'une meilleure précision de mesure même en présence de perturbations. Ledit détecteur mesure les variations d'impédance de deux bobines d'excitation (12b) en fonction de l'intensité des courants de Foucault produits par un premier et un deuxième rotor (11, 13), l'angle relatif de rotation étant fonction de la différence entre ces deux variations. Le premier rotor est revêtu de premières couches conductrices (11a) sur un côté par rapport à la direction de l'axe de rotation, disposées à intervalle donné dans le sens de la circonférence. Un noyau (12a) logeant deux bobines d'excitation est monté dans un noyau fixe (12) symétriquement par rapport un plan perpendiculaire à l'axe de rotation. Le deuxième rotor (13) est revêtu à sa périphérie extérieure d'une deuxième couche conductrice (13c) disposée avec un intervalle correspondant à celui des premières couches conductrices (11a).

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