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Position sensor

A technology of sensors and detection coils, which is applied in the direction of using electric/magnetic devices to transmit sensing components, etc., which can solve the problems of increased production costs, complex bobbin structures, and increased production costs.

Inactive Publication Date: 2009-04-01
MATSUSHITA ELECTRIC WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thickened end of the core results in an increase in the diameter of the detection coil into which the core is inserted
In addition, the mechanical resonance frequency decreases due to the increase in the end weight, so the vibration resistance will decrease
On the other hand, in terms of workability and quality control, it is easy to increase the production cost by applying the magnetic coating process to only a part of the rod core.
In addition, when changing the coil winding number of the detection coil, in order to prevent the occurrence of chaotic winding, the structure of the bobbin tends to become complicated
In addition, the prolongation of the time required for the operation of winding the coil on the bobbin leads to an increase in production cost

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 example

[0042] The present embodiment is characterized in that the shield member 5 having the following features is used in the position sensor having the basic structure described above. That is, the shield member 5 of the present embodiment has a tubular structure in which the detection coil 1 can be accommodated, and the axial region required for the shield member 5 is formed in such a manner that it is electrically discontinuous in the circumferential direction.

[0043] For such a shielding member 5, for example, it is possible to use Figure 3A with 3B The tubular member shown. The tubular member is formed such that the first flange 13 and the second flange 14 of the bobbin 10 are in contact with the inner surface of the tubular member. In addition, the desired axial area of ​​the tubular member 5 has a slit 51 for providing an electrical discontinuity in the circumferential direction. In short, as Figure 3B As shown, said tubular member having a substantially C-shaped cros...

no. 2 example

[0047] The present embodiment is characterized in that the shield member 5 having the following features is used in the position sensor having the basic structure described above. That is, the shield member 5 of the present embodiment has a tubular structure in which the detection coil 1 can be housed. In addition, the shield member 5 is a metal tubular member formed such that the material properties are not uniform in the axial direction (travel direction of the magnetic core). Specifically, the Figure 5 The illustrated tubular member serves as the shielding member 5 . The tubular member is formed such that the first flange 13 and the second flange 14 of the bobbin 10 are in contact with the inner surface of the tubular member. In addition, the tubular member has a first shielding portion 53 and a second shielding portion 54, the first shielding portion 53 is used to surround an axial region of the detection coil 1, the axial region is limited from being in contact with th...

no. 3 example

[0050] The present embodiment is characterized in that the shield member 5 having the following features is used in the position sensor having the basic structure described above. That is, the shield member 5 of the present embodiment has a tubular structure in which the detection coil 1 can be housed. In addition, the shielding member 5 has a first inner surface for surrounding one axial region of the detection coil and a second inner surface for surrounding the other axial region of the detection coil. , the first and second inner surfaces are formed in such a way that the distance between the second inner surface and the detection coil is smaller than the distance between the first inner surface and the detection coil.

[0051] For such a shield member 5, for example, a tubular member shown in FIG. 6 can be used. The tubular member is formed such that the first flange 13 and the second flange 14 of the bobbin 10 are in contact with the inner surface of the tubular member. ...

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PUM

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Abstract

A position sensor with excellent linearity of coil impedance is provided. This position sensor is equipped with a tubular detection coil, a magnetic core movable in the detection coil, a drive circuit for the detection coil, a signal processing circuit for converting a change in impedance of the detection coil into an electric signal, and a shield member disposed around the detection coil. The shield member is a tubular member having a first inner surface for surrounding an axial region of the detection coil, and a second inner surface for surrounding another axial region of the detection coil. The tubular member is formed such that a distance between the second inner surface and the detection coil is smaller than the distance between the first inner surface and the detection coil.

Description

technical field [0001] The present invention relates to a position sensor that utilizes a change in impedance of a detection coil caused by a displacement of a magnetic core. Background technique [0002] The position sensor is capable of outputting an electrical signal according to a change in impedance of a tubular detection coil caused by physical displacement of a magnetic core in the detection coil, and has been used for measurement and control in many fields such as internal combustion engines and electric power equipment. In such a position sensor, it is desirable that the impedance of the detection coil changes linearly with the displacement of the magnetic core from the viewpoint of improving the reliability of the detection accuracy. However, in practice, as Figure 15 As shown in , deviations from the ideal characteristics occur as the displacement of the core increases. In order to ensure stable detection accuracy, it is recommended to use only the movable range...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/20
Inventor 丹羽正久猪冈结希子光武义雄太田智浩
Owner MATSUSHITA ELECTRIC WORKS LTD