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Displacement sensor for contactlessly measuring a relative position by means of a magnetic field sensor array on the basis of the hall effect

A technology of magnetic field sensor and displacement sensor, which is applied in the field of displacement sensor and can solve the problem that the industrial application of clamping voltage is not flexible enough

Active Publication Date: 2014-12-17
TE CONNECTIVITY GERMANY GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0022] However, these clamping voltages are not flexible enough for specific industrial applications because they are fixedly preset and do not depend on the current measured value

Method used

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  • Displacement sensor for contactlessly measuring a relative position by means of a magnetic field sensor array on the basis of the hall effect
  • Displacement sensor for contactlessly measuring a relative position by means of a magnetic field sensor array on the basis of the hall effect
  • Displacement sensor for contactlessly measuring a relative position by means of a magnetic field sensor array on the basis of the hall effect

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Embodiment Construction

[0059] The invention will now be described in more detail below with reference to the accompanying drawings.

[0060] figure 1 A displacement sensor arrangement with a single Hall probe is shown in . In this arrangement, the Hall sensor 100 is mounted in a fixed position, while the permanent magnet 102 is supported in a linearly movable manner relative to the Hall sensor 100 . The permanent magnet 102 is polarized such that its N / S axis is positioned parallel to the direction of motion. As a matter of principle, however, the principles of the invention are equally applicable to arrangements in which the permanent magnet 102 is polarized such that its N / S axis extends transverse to the direction of motion. The permanent magnet 102 can be moved out in two directions via a displacement path 104 determined by the respective application figure 1 The zero position shown. Hall sensor 100 detects at least two orthogonal magnetic field components - one extending along the line of m...

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Abstract

The present invention relates to a displacement sensor for contactlessly measuring a relative position of a magnetic field source (102) which produces a magnetic field and a magnetic field sensor (100) in relation to each other, wherein the magnetic field source (102) and the magnetic field sensor (100) are movable relative to each other. A plurality of magnetic field probes (106-1, 106-2, 106-3, to 106-N) produce a plurality of position signals, each magnetic field probe detecting at least two spatial components (By, Bz) of a magnetic flux density of the magnetic field. A control and calculation unit (108) calculates an output signal of the displacement sensor on the basis of the plurality of position signals, and a storage unit (110) stores the individual position signals, the control and calculation unit calculating a magnitude of the magnetic flux density and comparing it with a predetermined threshold value in order to output the current calculated position signal for each magnetic field probe (106-1, 106-2, 106-3, to 106-N) if the magnitude of the magnetic flux density is higher than the threshold value and in order to output a preceding stored position signal if the magnitude of the magnetic flux density is smaller than or equal to the threshold value.

Description

technical field [0001] The invention relates to a displacement sensor for contactless measurement of the relative position of a magnetic field source generating a magnetic field and a magnetic field sensor with respect to each other. The invention still further relates to a corresponding measuring method for establishing said position. [0002] By means of the method according to the invention, in particular linear movements are intended to be detected and evaluated contactlessly based on the Hall effect by means of the magnetic interaction between one or more permanent magnets and the magnetic sensor arrangement. Background technique [0003] The measurement of linear motion is used, for example, to control machine tools, in pneumatics, in automation technology and robotics, and in the automation sector. The contactless detection of the movement offers, inter alia, the advantage of being free from wear. Optical and magnetic methods are the most widespread among non-contac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/14
CPCG01D5/145G01B7/00
Inventor O.沙夫
Owner TE CONNECTIVITY GERMANY GMBH