Displacement sensor
AssigneeRobert Bosch GmbH
InventorsWolfgang Welsch, Michael Kleinknecht, Mathias Kimmerle, Sina Fella
Life of this patent
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Abstract
A displacement sensor has a magnetic measuring transducer and at least two sensor units, which are arranged at different positions spaced from each other, the measuring transducer being slidably mounted relative to the sensor units. The measuring transducer is magnetized such that it has a magnetic field which rotates at least partially about an axis of rotation along the measuring transducer, and the axis of rotation of the magnetic field runs parallel to the sliding direction of the measuring transducer. The sensor units are designed to each sense two magnetic measured variables proportionally to the magnetic field strength, both measured variables being sensed by both sensor units.
Claims15
A displacement sensor comprising:
- a magnetic measurement value transducer;
- and
- at least two sensor units arranged in different positions at a distance from one another, wherein the measurement value transducer is mounted displaceably in a displacement direction relative to the at least two sensor units, and
- wherein the measurement value transducer is magnetized in such a way that the measurement value transducer has a magnetic field which rotates at least in sections about a rotation axis along the measurement value transducer,
- wherein the rotation axis of the magnetic field is oriented parallel in relation to the displacement direction of the measurement value transducer,
- wherein each of the at least two sensor units is configured to detect two magnetic measurement variables proportionally in relation to the magnetic field strength, wherein both of the two measurement variables are detected by each of the at least two sensor units, and
- wherein the at least two sensor units are arranged next to one another in the displacement direction.
A method for operating a displacement sensor, which comprises a magnetic value transducer and at least two sensor units arranged in different positions at a distance from one another, the two sensor units arranged next to one another in a displacement direction, the measurement value transducer being mounted displaceably in the displacement direction relative to the at least two sensor units, the measurement value transducer being magnetized in such a way that the measurement value transducer has a magnetic field which rotates at least in sections about a rotation axis along the measurement value transducer, the rotation axis of the magnetic field being oriented parallel in relation to the displacement direction of the measurement value transducer, the method comprising:
- detecting two measurement variables proportionally in relation to a magnetic field strength of the magnetic field with each sensor unit, wherein both measurement variables are detected by each of the at least two sensor units;
- ascertaining a difference value from the two measurement variables which are detected by the at least two sensor units;
- and
- determining a position of the measurement value transducer based on the difference value and the two measurement variables.
A displacement sensor comprising:
- a magnetic measurement value transducer;
- and
- at least two sensor units arranged in different positions at a distance from one another,
- wherein the measurement value transducer is mounted displaceably relative to the at least two sensor units,
- wherein the measurement value transducer is magnetized in such a way that the measurement value transducer has a magnetic field which rotates at least in sections about a rotation axis along the measurement value transducer,
- wherein the rotation axis of the magnetic field is oriented parallel in relation to the displacement direction of the measurement value transducer, and
- wherein each of the at least two sensor units is configured to detect two magnetic measurement variables proportionally in relation to the magnetic field strength, wherein both of the two measurement variables are detected by each of the at least two sensor units, and
- wherein the measurement value transducer has at least one clamping section in which a gradient of the rotation of the magnetic field in a longitudinal direction of the measurement value transducer is equal to zero.
Dependencies are inferred from the claim text.