Inductive sensor for detecting a position

Abstract

The invention relates to an inductive sensor for detecting a position, comprising: - a circuit board extending in a longitudinal direction and a transverse direction transverse to the longitudinal direction, - a first inductive transformer arranged on the circuit board for the secondary output of a first sensor signal dependent on a first coupling, - a second inductive transformer arranged on the circuit board for the secondary output of a second sensor signal dependent on a second coupling, and - a coupling element arranged in a vertical direction transverse to the longitudinal direction and transverse to the transverse direction above the two transformers, which coupling element is configured to influence the coupling in the two transformers depending on the position to be detected, - wherein each transformer has at least one receiving coil and an excitation coil enclosing the receiving coil,so that a periodic alternating voltage signal applied to the excitation coil can induce the respective sensor signal dependent on the respective coupling into the receiving coils, wherein the receiving coil has a periodically recurring loop structure with which a receiving geometry is formed.

Claims

[1] Inductive sensor for detecting a position, comprising: - a printed circuit board extending in a longitudinal direction and a transverse direction transverse to the longitudinal direction, - a first inductive transformer arranged on the circuit board for the secondary output of a first sensor signal dependent on a first coupling, - a second inductive transformer arranged on the circuit board for the secondary output of a second sensor signal dependent on a second coupling, and - a coupling element arranged in a height direction transverse to the longitudinal direction and transverse to the transverse direction above the two transmitters, which coupling element is designed to influence the coupling in the two transmitters depending on the position to be detected, - wherein each transmitter has at least one receiving coil and an excitation coil surrounding the receiving coil, so that the respective sensor signal dependent on the respective coupling can be induced in the receiving coils by a periodic alternating voltage signal applied to the excitation coil, wherein the receiving coil has a periodically recurring loop structure with which a receiving geometry is formed. [2] Sensor according to claim 1, wherein the two transformers are arranged side by side on the circuit board in the longitudinal direction and / or in the transverse direction. [3] Sensor according to claim 1 or 2, wherein the two transmitters extend around a rotation axis about which the coupling element is rotatably mounted. [4] Sensor according to claim 3, wherein the two transmitters are point-symmetrical to the axis of rotation or axially symmetrical to a mirror axis passing through the axis of rotation. [5] Sensor according to claim 3 or 4, wherein the receiving coils of the two transmitters are spaced apart from each other by a distance of between 20° and 60°, preferably between 30° and 50°, seen in the circumferential direction around the axis of rotation. [6] Sensor according to one of claims 3 to 5, wherein in at least one transmitter a minimum radial distance between an excitation coil turn of the excitation coil and a receiving coil turn of one of the receiving coils is between 10% and 20% of a maximum radial extent of the receiving coil turn at the angular position of the minimum radial distance. [7] Sensor according to one of claims 3 to 6, wherein the excitation coils of the transformers have circumferential ends as seen in the circumferential direction around the axis of rotation, between which a space with a circumferential distance is formed. [8] Sensor according to claim 7, wherein the coupling element has two radially opposite wings with a circumferential direction width extending in the circumferential direction and wherein the circumferential direction distance is selected to be greater than or equal to the circumferential direction width. [9] Sensor according to claim 8, wherein a free space is formed in the circumferential direction between the two wings. [10] Vehicle with - a chassis that can move in one direction of travel, - two rear wheels which movably support the chassis on the rear side seen in the direction of travel, - two front wheels which movably support the chassis on the front side seen in the direction of travel (3), - a steering wheel for rotating a steering column about a rotation axis for steering the front wheels, and - a steering angle sensor according to one of the preceding claims for measuring an angle of rotation of the steering column about the axis of rotation.

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