Device for contactless measurement of a displacement path, especially for the detection of position and movement
OwnerUlrich Kindlerinventor
Life of this patent
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Abstract
The invention relates to a device (10) for contactless measurement of a displacement path, especially for the detection of position and movement, comprising a sensor electronics system for the provision of an alternating current and the evaluation of alterations therein, in addition to an inductive sensor (13) comprising at least one flat coil (15), whereby each coil (15) is configured with a helicoidal conductor (22) disposed on a plane and one of the two flat surfaces (19) thereof forms a measuring surface (14) which variously covers a measuring object (11), arranged at a distance, according to the movement thereof parallel to the measuring surface (14).
Claims20
Device for contactless measurement of a displacement path, especially for the detection of position and movement, comprising a sensor electronics system for the provision of an alternating current and the evaluation of alterations therein, in addition to an inductive sensor comprising at least one coil, characterized in that each coil (15) is configured with a helicoidal conductor (22) disposed on a plane, and one of the two flat surfaces thereof forms a measuring surface (14) which variously covers a measuring object (11), arranged at a distance, according to the movement thereof parallel to the measuring surface (14).
Device according to one or more of the preceding claims, characterized in that the flat coil (15) is printed or sputtered directly onto a silicon chip, in whole or in part, which chip also carries all the other circuits.
Device according to one or more of the preceding claims, characterized in that the measuring object (11) that influences the measuring surface (14) is electrically conductive, or that the measuring object (11) has an electrically conductive target (21) or measuring collar (21), and covers a coil area of the flat coil (15) that can be predetermined geometrically, as a function of the position of the target (21) or measuring collar (21).
Device according to one or more of the preceding claims, characterized in that a rectangular measuring surface (14), diagonally divided, has two triangular flat coils (15), whereby the inductive resistor (25) and the resistor (26) of one flat coil (15) and a complementary resistor (39) form one half (23) of a bridge circuit (20), whose other half (24) is diagonally complemented with inductive resistor (27) and resistor (28) and another complementary resistor (40) to form a full bridge.
Device according to one or more of the preceding claims, characterized in that the target (21) or the measuring collar (21) is adapted to the measuring object (11) and/or rectangular and/or bow-shaped and/or ring-shaped.
Device according to one or more of the preceding claims, characterized in that the measuring surface (14) of the sensor (13) for a movement measurement of balls or rollers in bearings is arranged in their central vicinity and has a smaller cross-sectional surface than the measuring object (11).
Device according to one or more of the preceding claims, characterized in that the measuring surface (14) of the sensor (13) is shaped like an arc, in order to determine movement on an arc.
Device according to one or more of the preceding claims, characterized in that the measuring surface (14) of the sensor (13) has a great change in surface in a region with the desired greatest resolution.
Device according to one or more of the preceding claims, characterized in that a rectifier is an integral part of the sensor electronics system.
Device according to one or more of the preceding claims, characterized in that Schmitt trigger electronics are an integral part of the sensor electronics system, and that the sensor electronics system emits a threshold signal.
Device according to one or more of the preceding claims, characterized in that the device is completely arranged within a housing.
Dependencies are inferred from the claim text.