JP2001227903A - Telescopically spiraling slip inductor reactor displacement sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a telescopically spiraling slip inductor reactor displacement sensor having enhanced effective length ratio without impairing its linear characteristic. SOLUTION: The telescopically spiraling slip inductor reactor displacement sensor comprises an AC excitation coil 10 and a telescopically spiraling inductor 12. The telescopically spiraling inductor 12 is formed of a double-layer winding coil comprising an inner-layer coil 12b and an outer-layer coil 12a of a circular element wire 10a which are wound in different directions, with the start and end terminals of the inner and outer layers thereof being connected together by short-circuit wires 13 and 13 and electrically shorted to form a closed loop wherein a voltage induced by flux linkage is shorted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod-shaped AC exciting wire, and a sliding induction coil provided in an electromagnetic induction magnetic field formed by the exciting wire and having the same axial axis as the wire and subjected to displacement in the axial direction. And detecting the displacement based on a change in the reactance of the AC excitation wire loop and displaying the displacement. In a sliding inductor reactor, the distance between displacement reference points is obtained by forming the sliding inductor into an elastic spiral structure. The present invention relates to a telescopic spiral-type sliding inductor reactor displacement sensor capable of simplifying the structure and improving the effective length ratio without deteriorating the linear characteristics with respect to, and enabling the miniaturization and expansion of versatility.

[0002]

2. Description of the Related Art In a conventional sliding inductor reactor,
The basic structure of the sliding inductor used in the reactor is a single conductive metal tube. In this case, the output characteristics are ideal linear characteristics, but the effective displacement between the reference points is effective. The distance and the ratio to the total length of the reactor, that is, the effective length ratio is 50% or less, which may limit the use range. This is due to the shape of the sliding inductor, and developments for shortening the inductor have been made. However, there are problems in that the structure is complicated, the linearity characteristic is nonlinear, and the output is reduced.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has an object to improve the effective length ratio without deteriorating the linear characteristic. It is intended to provide a displacement sensor.

[0004]

SUMMARY OF THE INVENTION Accordingly, a telescopic spiral-type sliding inductor reactor displacement sensor according to the present invention comprises a rod-shaped AC exciting wire and a telescopic spiral formed on the outer periphery of the exciting wire and subjected to axial displacement. An inductor and a sliding inductor reactor displacement sensor, wherein the telescopic spiral inductor comprises a closed loop coil formed of a telescopic spiral member having a fixed end at one end and a displaceable end at the other end. The displacement of the opposing length facing the AC exciting wire caused by the extension of the displacement end of the telescopic spiral inductor is displayed in correspondence with the measurement of the reactance of the non-opposed portion of the AC wire. It is characterized by.

According to the first aspect of the present invention, there is provided a rod-shaped AC excitation wire loop whose axial direction is the displacement direction of a movable body that moves linearly, and is formed on the outer periphery of the excitation wire loop, and is attached to the movable body. A displaceable sliding inductor reactor displacement sensor, comprising a telescopic spiral inductor having one end fixed and a displaceable end at the other end, and the wire loop formed by an electrically closed-loop coil and induced by linkage flux. In this configuration, the voltage is short-circuited, and the structure is replaced with a single conductive metal tube. That is, since the length of the portion facing the AC excitation wire loop caused by the displacement decreases the reactance of the opposite portion of the AC excitation wire loop, the opposed portion is linearly displayed by measuring the remaining reactance value. it can. In addition, because of the configuration using the helical member, the length becomes shorter when compressed, and the effective length ratio can be improved.

The telescopic spiral inductor according to claim 1 is
It is composed of a two-layer winding wire made of a stretchable spiral member having different winding directions, and a structure in which the inner and outer two layers of a winding start and a winding end are connected to each other to form a closed loop coil.

According to a second aspect of the present invention, the telescopic spiral inductor according to the second aspect is constituted by a two-layer winding wire having different winding directions, and the two-layer wire loop starts and ends with each other. Are connected to each other to form a closed loop coil, and the induced voltage is short-circuited by the interlinkage magnetic flux.

In the case of the two-layer winding, since the upper and lower wires are placed in a linked state at the time of extension by extending the winding direction, the upper and lower wires are not entangled and smooth expansion and contraction can be performed. it can.

The telescopic spiral inductor according to the first and second aspects is characterized in that it is constituted by a wire having a flat cross section having a flat surface in the axial direction of the winding wire.

According to a third aspect of the present invention, the cross-sectional shape of the wire forming the helical inductor according to the first and second aspects has a flat surface in the axial direction which is longer in the radial direction of the spiral than the circular cross-section. The length of the spiral is shortened by this flattening. Even if the flattening ratio from the circular cross section is, for example, about 30%, if there is no change in the cross sectional area, the electric resistance of the closed circuit is also reduced. There is no change and the length of the telescopic spiral inductor can be shortened accordingly without changing the output characteristics, and the effective length ratio can be improved. In particular, in the case of a two-layer wound wire loop, when sliding on the outer peripheral surface of the AC excitation wire loop during expansion and contraction, it is necessary to slide between upper and lower layers. It can be flattened by pressing or pulling out, and a complicated chamfering operation can be omitted.

According to a second aspect of the present invention, there is provided a telescopic spiral inductor comprising a two-layer wound wire loop, wherein the wires of the inner and outer wire loops are fixed to the movable end and a plurality of intermediate portions, and the outer circumference of the exciting wire loop is fixed. A sliding tube with a terminal flange and a sliding tube with an intermediate flange are provided so that the sliding tube can slide, and the sum of the respective lengths of the sliding tube is set to be equal to or less than the minimum shortened length of the inner and outer two-layer winding wire. And

The invention according to claim 4 is characterized in that a required number of intermediate flanged slide tubes are provided at an intermediate portion of a telescopic spiral inductor formed of a two-layer winding wire and a terminal flanged slide tube is provided at a movable end portion. The total length of these flanged slide tubes is selected to be less than or equal to the minimum shortened length of the telescopic spiral inductor. The intermediate flanged slide tube prevents the output from becoming unstable with respect to displacement due to eccentricity with respect to the AC excitation wire loop due to vibration when the telescopic spiral inductor is extended,
The bridge between the inner and outer wires reduces the electrical resistance and contributes to an increase in output against displacement. In addition, when the telescopic spiral inductor expands and contracts due to external force, the sliding tube with a terminal flange smoothly slides without tilting and eccentricity with respect to the outer peripheral surface of the AC excitation wire loop, and accurately moves with respect to the excitation wire loop position. The opposing position is obtained.

It is an essential requirement that the total length of the flanged slide tubes be selected to be equal to or less than the shortest length of the telescopic spiral inductor from the viewpoint of improving the effective length ratio of the reactor.
As described above, each flanged slide tube contributes to the improvement of the operation and output characteristics in terms of structure, and especially in a reactor having a constant length, the intermediate flanged slide tube requires a plurality of intermediate installations. I have.

Further, the fixed end of the telescopic spiral inductor according to claim 1 or 2 is provided on one end surface of the AC excitation wire loop,
It is characterized in that a displacement end is provided toward the other end side of the AC excitation wire loop and slides.

According to the fifth aspect of the present invention, in order to effectively utilize the linear characteristic of the sliding inductor reactor displacement sensor, the setting of the inductor shortened by the expansion and contraction spiral inductor of the present invention provides the expansion and contraction spiral before extension. The inductor is provided in a non-linear portion of the output characteristic of the reactor, and the linear portion of the output characteristic is effectively used to improve the effective length ratio.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not merely intended to limit the scope of the present invention, but are merely illustrative examples unless otherwise specified. Absent. FIG.
FIG. 3 is a diagram showing a schematic configuration of an embodiment of a telescopic spiral type slip inductor reactor displacement sensor of the present invention, FIG. 2 is a diagram showing a schematic configuration of another embodiment of FIG. 1, and FIG. It is the figure which provided the slide tube with a flange in 1 expansion-contraction spiral inductor. FIG. 4 is a characteristic curve of the telescopic spiral inductor reactor displacement sensor shown in FIGS. 1 and 2, wherein the horizontal axis represents the displacement value of the distal end of the distal end of the telescopic spiral inductor, and the vertical axis represents the impedance value of the AC excitation wire loop. Are shown.

FIG. 1 shows a schematic configuration of one embodiment of a telescopic spiral type sliding inductor reactor displacement sensor according to the present invention. As shown in the figure, the telescopic spiral type sliding inductor reactor displacement sensor of the present invention includes an AC exciting wire loop 10 and a telescopic spiral inductor 12. The AC excitation wire loop 10 is wound tightly with one or two layers around a rod-shaped magnetic core made of a metal tube 11 filled with a magnetic metal 11a, and is connected through a terminal 15 to about 5 KHz.
Is excited by a constant current audio frequency power supply. The telescopic spiral inductor 12 is formed by a two-layer winding wire composed of a circular element wire 10a having a circular cross-section and having an inner layer wire 12b and an outer layer wire 12a having different winding directions, and a winding start terminal of the inner layer and the outer layer. Short-circuit wires 13, 1
3 and electrically short-circuited to form a closed loop to short-circuit the voltage induced by the linkage magnetic flux.

The telescopic spiral inductor 12 has a fixed end 16
b so that at least the displacement end 16a of the tip is located at _one terminal position O ₁ (see FIG. 4) of the AC excitation wire loop 10, and the displacement end 16a corresponds to the displacement of a movable body (not shown). In response to the external force p, the outer circumference of the AC excitation wire loop 10 is slidably displaced while extending in the direction of arrow A.

It should be noted that as shown in FIG.
2 fixed end 16b is Yes in the configuration for fixing to one of the terminal portions O ₁ of the AC excitation line wheels 10, and the length t ₀ of the telescopic spiral inductor 12 by use of a circular wire 10a of circular cross-section large next from the characteristic curve non-linear section S ₁ shown in FIG. 4,
As seen in the figure, at the center portion excluding the terminal portion t _0, including non-linear portion S ₁ of the AC excitation line wheels 10, the extendable helical inductor 1
2 expands and contracts, and the terminal 15 of the AC excitation wire loop 10
, A linear value corresponding to the displacement of the telescopic spiral inductor 12 is output. However, this results in a reduction in the effective length ratio.

FIG. 2 shows a schematic configuration of another embodiment of FIG. As shown in the figure, a telescopic spiral-type sliding inductor reactor displacement sensor according to another embodiment includes an AC excitation wire ring 1.
0 and a telescopic spiral inductor 14. The AC excitation wire loop 10 is wound tightly with one or two layers around a rod-shaped magnetic core made of a metal tube 11 filled with a magnetic metal 11a, and is excited via a terminal 15 by a constant current audio frequency power supply of about 5 KHz. . The telescopic spiral inductor 14 is formed of a two-layer wound wire composed of a flat wire 14c having a flat cross section elongated in the radial direction of the spiral and including an inner layer wire 14b and an outer layer wire 14a having different winding directions. The winding start terminal and the winding end terminal of the inner layer and the outer layer are connected by short-circuit wires 13 and 13 and electrically short-circuited to form a closed loop, thereby short-circuiting the voltage induced by the interlinkage magnetic flux.

The flat wire 1 having the flat cross section and a thickness t
4c has the same cross-sectional area and the same electric resistance as the circular wire 10a by drawing out a wire having a circular cross section. The thickness of the flat wire 14c is smaller than that of the circular wire 10a. Therefore, the winding length of the telescopic spiral inductor 14 having the same number of turns is smaller than that of the telescopic spiral inductor 12 made of the circular wire 10a. Can be reduced to an appropriate length without deteriorating the electrical performance of the device. In the figure, the length t _S can be configured to be equal to the length S _{1 of the} non-linear portion, and the displacement in the direction of arrow A due to the external force p is performed in the linear portion of the characteristic curve.

Further, according to the above embodiment, it is possible to shorten the length of the telescopic spiral inductor 14 in the axial direction, to increase the telescopic magnification to be the shortest with respect to the maximum elongation, and to reduce the tension. In addition, even if the expansion / contraction ratio of the two-layer winding wire is in the range of about 10 times, the linear operation is performed regardless of the density of the wires.

The telescopic spiral inductor 1 shown in FIGS.
Reference numerals 2 and 14 denote a two-layer wound wire loop 12a having a different winding direction.
When formed by 12b, 14a, and 14b, the wires forming the inner and outer layers are interlinked with each other when expanded and contracted via an external force p, so that the wires can smoothly expand and contract without causing entanglement between each other. I do. In addition, since the outer periphery of the wire forming the two-layer winding is constituted by the circular wire 10a having a curved surface or the flat wire 14c, the outer circumferential surface of the AC excitation wire loop when expanding and contracting smoothly moves. Can do it.

FIG. 3 is a diagram in which a flanged slide tube is provided on the telescopic spiral inductor of FIG. As shown in the drawing, a two-layered telescopic spiral inductor 12 having a plurality of intermediate flanged slide tubes 18 and a terminal flanged slide tube 19 at a displacement end 16a is provided.
Is shown, the intermediate flanged slide tube 18 is shown.
Reduces the electric resistance of the spiral inductor by blocking the vibration against vibration when it is stretched by an external force p and bridging the spirals of the inner layer and the outer layer, and the sliding tube 19 with the terminal flange slides when sliding due to expansion and contraction. The spiral inductor is inclined or eccentric with respect to the outer peripheral surface of the AC exciting wire loop to be smoothly slid. The windings cut at the welding points 18a and 19a in the figure are welded and integrated with the flange of the slide tube. The flanged slide tube is provided not only for the telescopic spiral inductor 12 but also for the telescopic spiral inductor 14.

FIG. 4 is a characteristic curve of the telescopic spiral type sliding inductor reactor displacement sensor shown in FIGS. 1 and 2, and shows the displacement of the displacing ends 16 a and 17 a of the telescopic spiral inductors 12 and 14 and the AC excitation wire loop 20. The relationship between the impedance value and the output value from the terminal 15 is shown. The AC excitation wire ring 20 is configured to be excited by a constant current excitation power supply having an audible frequency of about 5 KHz.

[0026] In Figure, the output characteristics with respect to the displacement in the intermediate portion forms a non-linear portion, excluding the portion for the S ₁ is the magnetic flux leakage to the displacement of both end portions of the AC excitation line wheels 20 form a linear However, this linear portion is used particularly for displaying displacement between reference points of displacement.

The telescopic spiral inductor 12 shown in FIG.
t₀And is formed by the circular element wire 10a.
The relative positional relationship with the exciting coil 20 is
Terminal position O₁The displacement end 16a of the inductor 12 is located at
The displacement end 16 is moved in the direction of arrow A by an external force p.
a is extended. Therefore, only the linear part is used.
If used, the following effective length ratio is obtained. Effective length of displacement; S- (S₁+ S₂) Total length of the inductor reactor; S + t₀  Effective length ratio; S- (S₁+ S₂) / (S + t)₀) ×
100 (%)

Further, the circular wire 10a to form a flat pressed and flattened wire 14c, an elastic spiral inductor 14 is formed by the plain line, AC excitation line wheels 2 the inductor shortest t _S
Processed nonlinearly portion S ₁ and equal length of the terminal 0, when disposed said elastic spiral inductor 14 to the non-linear portion, the effective length of the _{displacement; S- (S 1 + S 2} ) the total length of the inductor reactor ; t _S = effective length ratio can be _{S 1; S- (S 1 +} S 2) / S × 100 (%) is obtained. Incidentally, if a conventional dielectric made of a single-tube conductor is used and the length is the same as the length of the AC excitation wire ring, the effective length ratio becomes: (S-2S ₁ ) / 2S × 100 (%). In the case of the line 14c, the effective length ratio is particularly improved and shortened as compared with the conventional single inductor, and the field of use of the sliding inductor is expanded.

[0029]

Since the telescopic spiral-type sliding inductor reactor displacement sensor of the present invention has the above-described structure, the effective length ratio can be improved without deteriorating the linear characteristics, and the non-rod of the hydraulic cylinder can be improved. This is effective when there is a problem with the effective length ratio, such as in the case of a mold cylinder.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of a telescopic spiral type slip inductor reactor displacement sensor of the present invention.

FIG. 2 is a diagram showing a schematic configuration of another embodiment of FIG. 1;

FIG. 3 is a view in which a flanged slide tube is provided on the telescopic spiral inductor of FIG. 1;

FIG. 4 is a characteristic curve of the telescopic spiral inductor reactor displacement sensor shown in FIGS. 1 and 2, wherein the horizontal axis indicates the displacement value of the displacement end of the telescopic spiral inductor, and the vertical axis indicates the impedance value of the AC excitation wire loop. It is a figure showing a terminal voltage.

[Explanation of symbols]

 10, 20 AC excitation wire loop 10a Circular wire 11 Metal tube 12, 14 Telescopic spiral inductor 13 Short circuit wire 14c Flat wire 15 Terminal 16a, 17a Displacement end 16b, 17b Fixed end 18 Intermediate flanged slide tube 19 With terminal flange Slide tube

Claims (5)

[Claims] 1. A sliding inductor reactor comprising a rod-shaped AC exciting wire and a telescopic spiral inductor formed on the outer periphery of the exciting wire and receiving displacement in an axial direction, wherein the telescopic spiral inductor has one end. A closed loop coil made of an extendable spiral member having a fixed end and a displacement end at the other end, and facing the AC excitation wire loop, generated by extension of the displacement end of the telescopic spiral inductor. A telescopic spiral-type sliding inductor reactor displacement sensor, characterized in that the length displacement is displayed in correspondence with the measurement of the reactance of the non-opposed portion of the AC wire loop. 2. The retractable spiral inductor comprises a two-layer winding wire composed of elastic spiral members having winding directions different from each other, and connects a winding start end and a winding end end of inner and outer two layers, respectively, to form a closed loop coil. The telescopic spiral-type sliding inductor reactor displacement sensor according to claim 1, characterized in that: 3. The telescopic spiral-type slide according to claim 1, wherein the telescopic spiral inductor is constituted by a wire having a flat cross section having a flat surface in the axial direction of the winding loop. Inductor reactor displacement sensor. 4. A telescopic spiral inductor comprising a two-layer winding wire loop, wherein a wire of an inner and outer wire loop is fixed to a movable end portion and a plurality of intermediate portions, and the outer circumference of the AC excitation wire loop is slid. A sliding tube with a terminal flange and a sliding tube with an intermediate flange are provided, and the sum of the respective lengths of the sliding tube is set to be equal to or less than the shortest length of the inner and outer two-layer winding wire loop. 2
A telescopic spiral-type slip inductor reactor displacement sensor as described. 5. A structure in which a fixed end of the telescopic spiral inductor is provided on one end surface of an AC exciting wire, and a displacement end is provided toward the other end of the AC exciting wire and slidable. The telescopic spiral-type sliding inductor reactor displacement sensor according to claim 1 or 2, wherein: