Inductive position detector

A detector, inductive technology, applied in the field of inductive position detectors, which can solve the problems of waste, wrong time, etc.

Inactive Publication Date: 2004-09-01
NEWALL MEASUREMENT SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is inconvenient, leads to errors and wastes time, especially if the machine is in the middle of processing a workpiece

Method used

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  • Inductive position detector
  • Inductive position detector
  • Inductive position detector

Examples

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Embodiment Construction

[0032] Such as figure 1 The illustrated position detector 10 includes a longitudinally extending scale 20 and a sensor 30 . The sensor 30 surrounds the scale 20 and is movable along the length of the scale 20 .

[0033] The scale 20 comprises a tube 21 of non-magnetic material housing a series of magnetic beads 22 housed in point contact in the tube 21 and constrained to prevent the beads 22 from relative motion between them. Sensor 30 includes a plurality of transmit coils (not shown) and a plurality of pickup coils (not shown). The transmit coils are used to induce a magnetic field along the line of contacts of the beads 22, and the pick-up coils are arranged to detect changes in the magnetic field as the beads 22 move relative to the pick-up coils. A detector circuit (not shown) is used to analyze the signaling to give position information. Such devices are well known in the art and one such device has been described in GB1513567. Specifically, the total position value...

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PUM

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Abstract

An inductive position detector (10) which includes a scale (20) having a longitudinal axis containing a train of magnetic balls (22), and a transducer (30) moveable relative to the scale (20). The transducer (30) includes means to induce a magnetic field in the scale (20). Magnetic markers (23) are provided at axially spaced locations along the scale (20). As the transducer (30) is moved along the scale (20), the pattern of magnetic markers (23) detected enables the position of the transducer to be determined.

Description

technical field [0001] The present invention relates to inductive position detectors, particularly of the type described in GB1513567 and improvements thereto. Such devices are typically mounted on the machine tool and can be used to determine the position of the machine tool head relative to the workpiece. Background technique [0002] This type of detector consists of an elongated magnetic element with periodic dimensional variations in a direction perpendicular to the longitudinal axis of the element. The element is typically a series of steel balls aligned in a point-contact manner. Sensors surrounding the magnetic element and running along its length are used to sense the magnetic field in the element. Periodic variations in the dimensions of the magnetic element result in periodic variations in the magnetic field that can be detected and, as such, provide corresponding periodic signaling that can be used to determine the relative position of the element with resp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/245G01D1/00G01D5/14G01D5/20G01D5/249
CPCG01D5/2046G01D5/2497G01D5/2495G01D5/145
Inventor 弗雷德里克·马克·胡德曼杰弗里·格拉斯哥奈杰尔·阿瑟顿
Owner NEWALL MEASUREMENT SYST
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