WO2019174677A1 - Conducteur, dispositif de mesure comprenant un conducteur ainsi que procédé pour la mesure d'une torsion d'un conducteur - Google Patents

Conducteur, dispositif de mesure comprenant un conducteur ainsi que procédé pour la mesure d'une torsion d'un conducteur Download PDF

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Publication number
WO2019174677A1
WO2019174677A1 PCT/DE2019/100226 DE2019100226W WO2019174677A1 WO 2019174677 A1 WO2019174677 A1 WO 2019174677A1 DE 2019100226 W DE2019100226 W DE 2019100226W WO 2019174677 A1 WO2019174677 A1 WO 2019174677A1
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WO
WIPO (PCT)
Prior art keywords
conductor
jacket
line
wire
torsion
Prior art date
Application number
PCT/DE2019/100226
Other languages
German (de)
English (en)
Inventor
Erwin Köppendörfer
Markus Schill
Bernd Janssen
Original Assignee
Leoni Kabel Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Leoni Kabel Gmbh filed Critical Leoni Kabel Gmbh
Publication of WO2019174677A1 publication Critical patent/WO2019174677A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
    • G01L5/101—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means using sensors inserted into the flexible member

Definitions

  • the invention relates to a line, a measuring arrangement with such a line and a method for measuring a torsion of a corresponding line.
  • a line generally has one or more conductors, which are typically each encased with insulation, so that a corresponding number of wires are formed. Usually, several conductors or wires or both are possibly surrounded by additional functional elements of a common outer sheath. Such a line is used in a wide variety of applications, for example as a signal line or for energy supply.
  • the line is exposed to more or less mechanical loads. These loads are particularly great when the line connects two mutually movable components, in particular machine parts, for example, individual elements of a robot arm. Typical mechanical loads in operation are then tensile and elongated loads, bending loads and torsional loads, ie load by twisting. Often, the burdens are recurrent, so over time the line can sometimes be worn out and possibly even destroyed. Examples of destruction are a breakage of one of the conductors or the insulation or the outer jacket. In any case, there is a risk of performance degradation, i. the line no longer fulfills the intended task or no longer completely.
  • a line which is designed as a torsion sensor and by means of which a torsion can be measured.
  • the torsion should not only be measurable locally, but also straight along an elongate course of the conduit.
  • the torsion should not be measurable only once, but recurrently. The torsion should also during the intended use of the line, ie be measured accordingly during operation.
  • a measuring arrangement with such a line and a method for measuring a torsion of such a line are to be specified.
  • the object is achieved by a line which extends in a longitudinal direction and which is designed as a torsion sensor and for this purpose has a first conductor and a second conductor, wherein the first conductor is surrounded by a first jacket, wherein the first conductor and the first sheath forming a first wire, wherein the first conductor is non-centrically disposed in the first sheath, the second conductor being a reference conductor, the wire preferably being stranded with the reference conductor, with a gap between the first conductor and the second conductor is formed, which is variable by a twist.
  • a measuring arrangement which has a line and a measuring unit, wherein the line extends in a longitudinal direction and is designed as a torsion sensor and for this purpose has a first conductor and a second conductor, wherein the first conductor of a first cladding, wherein the first conductor and the first cladding form a first core, wherein the first conductor is arranged non-centrically in the first cladding, wherein the second conductor is a reference conductor, wherein the core is stranded with the reference conductor is, wherein between the first conductor and the second conductor, a distance is formed, which is variable by a torsion, wherein the measuring unit is adapted to measure the impedance of the line, wherein the line has a connection, for connection to the measuring unit.
  • the object is achieved by a method for measuring a torsion of a line, wherein the line extends in a longitudinal direction and is designed as a torsion sensor and for this purpose has a first conductor and a second conductor, wherein the first conductor is surrounded by a first jacket wherein the first conductor and the first cladding form a first conductor, the first conductor being non-centric in the first cladding, the second conductor being a reference conductor, the conductor being stranded with the reference conductor, between the first Ladder and the second conductor is formed a distance which is variable by a torsion, wherein an impedance of the line is measured and wherein a torsion of the line is detected, if the impedance changes.
  • the object is also achieved by the use of a conduit as described above as a torsion sensor.
  • the line is used separately in a first variant, in a second variant, the line is integrated in an elongated connection part.
  • the line is arranged in such a way that it extends between two mutually movable components and in particular connects them to one another.
  • the line is twisted in particular, for example by the two connecting parts rotating relative to each other.
  • Advantageous embodiments, developments and variants are the subject of the dependent claims.
  • the explanations regarding the line also apply mutatis mutandis to the measuring arrangement as well as to the method and vice versa.
  • the conduit generally extends in a longitudinal direction and is thus an elongated strand.
  • the line is designed as a torsion sensor, ie the line itself is designed as a sensor and not just a signal line for a separate sensor.
  • the cable is therefore also called a torsion sensor. Due to the elongated configuration, the line is then particularly suitable for torsion measurement along the line, ie not just for pointwise measurement of a torsion. By means of the line a torsion is therefore measurable.
  • the torsion of the cable itself is measured, ie its own torsion or torsion. When used as intended, the line itself is thus twisted, ie twisted and subject to a torsion, which is then measured by means of the line.
  • the line has a first conductor and a second conductor.
  • the conductors consist entirely of an electrically conductive material, for example aluminum or copper.
  • the conductors are each designed, for example, as a solid individual wire or alternatively as a stranded conductor.
  • the first conductor has in particular a conductor cross section in the range of 0.03 mm 2 to 3 mm 2 .
  • the first conductor is surrounded by a first jacket, so that the first conductor and the first jacket form a first core.
  • the first conductor is thus an insulated conductor and in particular completely surrounded by the jacket.
  • the jacket is made in particular of an insulating material, preferably of a dielectric.
  • the jacket preferably has a circular outer contour, so that in the overall composite of the line advantageously results in a particularly high mobility and in particular rotation of the first core.
  • the second conductor is a reference conductor and, for example, similar to the first conductor.
  • the reference conductor is arranged outside the first jacket, so that a distance is formed between the first conductor and the second conductor. This distance arises in particular due to the first jacket and possibly additional line elements which are arranged between the two conductors. are net. Due to the distance, an impedance is formed between the two conductors, which is also dependent on the material of the first jacket.
  • the wire and reference conductor are stranded together in a suitable configuration, i. twisted together.
  • the two conductors then each follow a particular helical or helical course.
  • the two conductors extend parallel to one another and are therefore not stranded with one another.
  • Such an arrangement is particularly easy to handle.
  • a torsion i. When the line is twisted, a torsion of the individual line elements, ie. the first wire and the reference wire.
  • a torsion changes the distance between the two conductors. The distance is therefore variable by a torsion, in particular an own twist of the line.
  • the distance between the two conductors also changes with the distance, so that the torsion can be measured as an impedance change and is also measured as such. From the strength of the impedance change, the strength of the torsion is advantageously determined.
  • additional line elements are arranged, e.g. Filling elements, strain relief elements, optical fibers, a shield, Beidrähte or the like. All line elements, i. The conductors are suitably surrounded by a common outer sheath.
  • An essential aspect of the cable designed as a torsion sensor is that the first conductor is arranged non-centrically in the first jacket.
  • “Non-centric” is also understood to mean “non-centric,””acentric,””off-center,” or “out of focus.”
  • the first wire is therefore deliberately not formed with a best possible centered conductor, but has a centricity, which is deliberately chosen larger than 1 and in particular also deliberately larger than usual tolerances.
  • a non-unity centricity is also called acentricity.
  • centricity is meant herein the ratio of maximum wall thickness to minimum wall thickness.
  • the first jacket generally has a wall thickness extending from the first conductor to an outer surface. surface of the jacket is measured and, due to the non-centric conductor, the wall thickness in the direction of rotation around the conductor varies between a minimum wall thickness and a maximum wall thickness. The ratio of these two extremal wall thicknesses corresponds to the centricity.
  • the first core preferably has a centricity of at least 1, 5 and at most 10, particularly preferably at most 3.5. However, a centricity outside of this range is basically suitable.
  • a torsion of the lead leads to a torsion of the first core and in particular to a rotation of the first core relative to the reference conductor. Due to the non-centric positioning of the first conductor in the first jacket, there is also a change in the distance between the two conductors, which is particularly easy to measure. Especially in combination with a circular first jacket results in a measurable change in the distance of the conductor at the same time as a particularly homogeneous rotation of the core as a whole.
  • the change in distance is advantageously independent of the choice of material for the first coat and generally also the choice of materials of other line elements.
  • a simple turn of the first wire is sufficient to produce a change in distance.
  • a deformation of the vein and especially of the first cladding advantageously does not matter. Therefore, in a suitable embodiment, a hard material is used for the first sheath, i. in particular a material with a Shore D hardness in the range of 50 to 90.
  • the first core and the reference conductor are non-rotating, that is, stranded with each other without reverse rotation, so that the first and second conductors are uniformly spaced from each other in the longitudinal direction.
  • reverse rotation stranding results in principle a course of the two conductors to each other, in which the distance despite the acentric arrangement of the first conductor in the first jacket along the entire line is constant, that is the same and not varied. Without torsion, the line is thus in a ground state in which the distance between the conductors along the line is constant.
  • the reference conductor has a conductor cross section which is at least a factor of 5 larger than a conductor cross section of the first conductor.
  • the conductor cross section of the reference conductor is at most a factor of 20 greater than the conductor cross section of the first conductor.
  • the reference conductor thus represents approximately a comparatively large reference surface, against which the first conductor rolls during a torsion. A change in distance is then primarily due to the acentricity of the first vein.
  • the reference conductor is, for example, a conductor of a power line for transmitting a power of at least 10W.
  • the reference conductor has a conductor cross-section which is smaller than the 5-fold conductor cross-section of the first conductor and preferably corresponds to the conductor cross-section of the first conductor.
  • the reference conductor is designed as a flat conductor or as a shield.
  • the reference conductor thus represents a reference surface, which is large compared to the first conductor.
  • the reference conductor extends in one plane and, in particular, parallel to the first wire.
  • the reference conductor In the configuration as a shield, the reference conductor completely surrounds the first core, wherein in a variant, further line elements are arranged within the shield.
  • the first conductor is movable relative to the shielding, because in an arrangement in which a shield surrounds only an unzenthari vein and rests against the jacket, the desired effect does not occur in particular.
  • the shield is in particular circular and surrounds the first wire then annular.
  • the wire is not arranged in the center of the shielding, but is offset, ie, a centered with respect to the shielding.
  • the second conductor is preferably surrounded by a second jacket, so that the second conductor and the second jacket together form a second core. The two wires are then stranded together to form a stranded pair of wires.
  • the second core is designed as a power core and has a larger conductor cross-section than the first conductor for transmitting electrical power.
  • electrical power is meant in particular a power of greater than 10W, preferably greater than 100W, more preferably greater than 1 kW.
  • the reference conductor has a significantly larger conductor cross-section than the first conductor and thus advantageously serves as a reference surface.
  • the line is then, for example, a hybrid cable, in which, with the second conductor designed as a line conductor, an electrical power is transmitted between two components for the energy supply of the one component.
  • the first conductor on the other hand, is not used for line transmission, but first for measuring the torsion.
  • the first conductor preferably also has a further functionality and serves, for example, as a signal line for data transmission.
  • the second conductor may in principle be arranged either centrically or non-centrically in the second jacket. Both variants are basically suitable. Particularly preferred is the latter embodiment, in which the second conductor is arranged non-centrically in the second jacket, in which case the two wires are stranded with each other, so that a stranded pair of wires is formed with two non-centric cores.
  • This embodiment has a particularly advantageous bending change behavior, in particular in comparison to a design with a flat conductor and is therefore particularly suitable for those lines for which the best possible bending cycle behavior is required.
  • the relative position of the two conductors relative to one another after stranding and in the ground state is, in particular, insignificant. Preferably, however, the relative position is known and is thus determined appropriately. If the cable is twisted, the two individual wires are also twisted accordingly. The two wires rotate especially in each case in the same direction. As a result, a change in the distance between the two conductors is generated here as well.
  • both cores are of identical design, ie they have the same conductors, the same shells and the same centricity, so that a single conductor design is sufficient for the production of the conductor.
  • the line has a measuring unit which is designed to measure the impedance between the first conductor and the second conductor.
  • the measuring unit is also referred to as measuring electronics in particular.
  • the measuring unit is thus integrated in the line so that it is accordingly an intelligent line which measures and preferably outputs its own torsion.
  • the measuring unit is suitably designed in such a way that it initially measures the impedance between the two conductors, in particular recurring and preferably continuously, and then derives the torsion from the impedance. Alternatively, the measured impedance is simply output.
  • the concepts for the line described so far are particularly suitable both for measuring the strength of the torsion and for measuring the position of the torsion.
  • the strength is expediently determined directly by the detection of the change in impedance of the value.
  • the position results from a merely local torsion as corresponding only local impedance change.
  • a position measurement takes place in a suitable embodiment by means of time domain reflectometry, TDR for short (ie time domain reflectometry).
  • TDR time domain reflectometry
  • Particularly preferred is a measuring method as described in WO 2017/216061 A1, in particular there also S.2 Z.19 to S.3 Z.28. In this measuring method, measuring pulses are fed into the line at a specific clock rate. The measuring pulses are reflected and then propagate in the opposite direction, so that at certain points a superimposition of opposing measuring pulses results. This superposition is dependent on the impedance of the line and is then determined to measure that same impedance.
  • the measuring unit is designed to carry out this measuring method.
  • a measuring method is used, as described in the applicant's international application of 30.10.2017, file number PCT / EP 2017/077828, which is still unpublished at the time of application.
  • Their disclosure content, in particular their claims (with accompanying explanations), are hereby expressly included in the present application. More specifically, reference is made to claims 1, 2, 6, 7 and 12 with the associated explanations, in particular on pages 5 / 6 and 8/9.
  • a number of individual measurements are carried out, with one measuring pulse being fed in each individual measurement, whereby a stop signal is generated when a predetermined voltage threshold value (at the feed location) is exceeded due to the reflected signal component. measuring the measured signal and the stop signal is determined and the voltage threshold value between the individual measurements is changed.
  • this method can be regarded as a voltage-discrete time measurement method.
  • the number of individual measurements is preferably more than 10, more preferably more than 20 or even more than 50 and for example up to 100 or even more individual measurements. From the large number of these individual measurements, a large number of stop signals are thus determined, which are arranged distributed over time.
  • the plurality of stop signals in conjunction with the threshold values therefore approximately represent the actual signal course of the injected measurement signal and the reflected components.
  • the actual signal profile for a fed-in measuring signal reflected at the power end is approximated, for example, by a mathematical curve fit.
  • the direction of the torsion is preferably measured, ie the direction in which the line is twisted.
  • the line has a third wire which has a third conductor and a third jacket in which the third conductor is arranged non-centrically.
  • the first and third cores and, in a three-core configuration, preferably all three cores are of similar construction.
  • the first conductor, the second conductor and the third conductor are stranded to form a three-conductor bundle, in a configuration with three cores corresponding to a three-core composite.
  • the three conductors are spaced apart in pairs at a respective distance, ie, the first conductor and the second conductor are spaced apart a first distance, the second conductor and the third conductor are spaced apart a second distance and the third and the first Conductors are spaced at a third distance from each other.
  • corresponding impedances result for the three distances.
  • These impedances are also referred to as partial impedances, since these are only measured between two of the three conductors.
  • a ground state of the line ie in a torsion-free state, at least two different distances are formed, ie at least two of the aforementioned three distances are of different sizes.
  • the three-wire composite thus allows a measurement of the strength, position and direction of a twist of the line.
  • the measurement is suitably carried out with a measuring unit as described above, wherein the concepts mentioned in connection with only two conductors are mutatis mutandis applicable to the design with three conductors.
  • an identification strip is formed along the first wire, which indicates the course of the first conductor.
  • the identification strip is characterized in particular by the fact that it is visible from the outside when viewing the first wire.
  • the identification strip is arranged in a suitable configuration in the region of a minimum wall thickness of the first jacket, i. where the mantle has the lowest wall thickness.
  • the identification strip advantageously characterizes the course of the first conductor, which is not necessarily visible from the outside due to the first jacket. In this way we ensure a correct hurrying, in particular in the case of the three-conductor described above, in which it can be ensured by means of the identification strip that at least two of the distances are also different.
  • the identification strip for example, a part of the first jacket is dyed in a different color from the rest of the first jacket.
  • Particularly suitable is an embodiment in which the identification strip and the first jacket are made of different materials.
  • the identification strip is expediently produced in the context of coextrusion.
  • the first jacket is extruded onto the first conductor and the identification strip is integrated into the first jacket.
  • the first jacket with the identification strip attached thereto has a circular cross-section.
  • the identification strip is printed or mechanically formed, e.g. imprinted.
  • an additional element is formed along the first wire and in or on the first casing, which is made of a material having a relative permittivity, which compared to the material of the first casing ge ringer or higher.
  • the material has a higher relative permittivity than the first jacket and is then arranged in the region of a minimum wall thickness of the first jacket.
  • the material has a lower relative permittivity than the first jacket and is then arranged in the region of a maximum wall thickness of the first jacket. Both variants can also be combined profitably.
  • the use of a material with different relative permittivity advantageously enhances the effect of changing the impedance in a torsion.
  • the additional element is arranged for this purpose in the range of the minimum or the maximum wall thickness.
  • the additional element generally runs parallel to the first conductor in particular.
  • the additional element does not necessarily have to be visible from the outside.
  • a configuration in which the additional element is completely integrated into the first jacket is suitable.
  • the first jacket is subdivided into at least two circular sectors, which are made of different materials accordingly.
  • the first jacket has two halves made of different materials, the first conductor then being arranged predominantly or completely in that half which has the higher relative permittivity.
  • the variant with an additional element with the variant with a characteristic strip is combined in such a way that the additional element is the identification strip.
  • the identification strip is thus made of a material with a different relative permittivity than the first jacket.
  • Particularly suitable for this purpose is a coextrusion as already described.
  • the aforementioned measuring arrangement has a line as described above and a measuring unit as described above.
  • the measuring unit has the line in a suitable embodiment, a connection, for example a plug, which is connected to the first conductor, the second conductor and possibly the third conductor.
  • the cable is connected to the measuring unit by means of the connection.
  • the measurement and evaluation are thus advantageously predominantly outside the actual line.
  • the above statements concerning the line with a measuring unit are analogously also applicable to the measuring arrangement with a line and a measuring unit, which is then arranged outside the line.
  • the measuring unit serves merely to supply a measuring signal, whereas an evaluation takes place separately from the measuring unit in an evaluation unit.
  • the evaluation unit is a part of the measuring arrangement, but in particular arranged spatially separated from the line and the measuring unit.
  • the measuring unit is integrated in the evaluation unit or vice versa.
  • the evaluation unit and the measuring unit are connected to each other, for example via a wireless connection.
  • the evaluation unit and the measuring unit are connected to each other, for example via the Internet.
  • the evaluation unit is designed in a suitable variant as a central evaluation unit for monitoring a plurality of lines.
  • the evaluation unit is a server which provides an evaluation of the sensor parameter as a cloud service.
  • the torsion measurement described here with the aid of the special line is preferably used generally for the torsion measurement of elongated bodies.
  • These bodies are, for example, elastic or movable and moving connecting parts, such as hoses, other media guides, energy guiding chains, etc.
  • FIG. 1 shows a line in a cross-sectional view, 2a, 2b, a variant of the conduit in each case in a cross-sectional view,
  • FIG. 3a, 3b each show a variant of the line in a side view
  • Fig. 4a, 4b shows a variant of the line in each case in a cross-sectional view.
  • the first conductor 4 is surrounded by a first jacket 8, so that the first conductor 4 and the first jacket 8 form a first wire 10.
  • the first conductor 4 is arranged non-centrically in the first jacket 8, i.
  • the wire 10 is an acentric wire 10.
  • the first wire 10 is intentionally not formed with a best possible centered conductor 4, but has a centricity which is deliberately chosen to be greater than 1, and preferably in the range of 1.5 to 3 , 5 lies.
  • the first jacket 8 generally has a wall thickness, which is measured from the first conductor 4 to an outer surface of the jacket 8 and varies in the direction of rotation about the conductor 4 between a minimum wall thickness minW and a maximum wall thickness maxW.
  • the ratio of these two extreme wall thicknesses minW, maxW corresponds to the centricity.
  • the second conductor 6 is a reference conductor which is stranded with the first wire 10. Between the first conductor 4 and the second conductor 6, a first distance A1 is then formed, which is variable by a torsion.
  • the azenthari arrangement of the first conductor 4 leads now in a torsion of the line 2 to a rotation of the wire 10 and thus to a change in the relative position of the two conductors 4, 6. This changes the distance A1.
  • this also defines an impedance between the two conductors 4, 6, which changes according to the distance A1. This impedance is now measured to then derive the torsion therefrom. This concept is common to all exemplary embodiments.
  • the reference conductor is formed as a flat conductor and extends flat along the wire 10 and thus provides a reference surface
  • the line 2 in Fig. 1 further comprises an outer sheath which surrounds the wire 10 and the second conductor 6 and in Fig. 1, however, is not shown.
  • FIGS. 2 a, 2 b a variant of the line 2 is shown, namely in FIG. 2 a in a ground state, which is torsion-free, and in FIG. 2 b in a twisted state, which is produced by a rotation of the line 2 ,
  • the second conductor 6 is surrounded by a second jacket 12, so that the second conductor 6 and the second jacket 12 together form a second core 14.
  • both cores 10, 14 are of similar design, i. the second wire 14 is also acentric.
  • the second core 14 is formed centrally and the second conductor then runs centrally in the second shell 12th
  • a distance A1 is formed between the two conductors 4, 6, which changes in a torsion of the line 2 as shown in Fig. 2b, in this case enlarged.
  • This change in the distance A1 can be determined as described by measuring the impedance.
  • a measuring unit 16 is arranged, which measures the impedance between the two conductors 4, 6.
  • the measuring unit 16 is connected in a manner not shown with the two conductors 4, 6. The impedance can then be used to determine the torsion.
  • the measuring unit 16 can also be combined with the other exemplary embodiments, but is not shown there for the sake of simplicity.
  • Fig. 3a is a line 2 with two wires 10, 14 as shown in Figs. 2a, 2b in a side view.
  • the two wires 10, 14 are twisted together here with 100% reverse rotation, so that the two conductors 4, 6 in the longitudinal direction L are evenly spaced from each other.
  • the reverse rotation-free stranding results in principle in a course of the two conductors 4, 6 to each other, in which the distance A1 is constant along the entire line 2 despite the acentric design of the cores 10, 14.
  • Fig. 3b shows a line 2 with two wires 10, 14, which are stranded without reverse rotation, that is, without reverse rotation.
  • the type of stranding in Figs. 3a, 3b is particularly illustrated by an identification strip 18, which is presently attached to one of the wires 10, 14.
  • the identification strip 18 runs parallel to the corresponding conductor 4, 6 and indicates its course.
  • the identification strip 18 is at the same time an additional element 20, which is formed along the first wire 10 and, in the present case, on the first casing 8.
  • the additional element 20 is made of a material having a relative permittivity which is lower or higher compared to the material of the first jacket 8.
  • the material has a higher relative permittivity than the first jacket 8 and is then arranged in the region of the minimum wall thickness minW of the first jacket 8.
  • the material has a lower relative permittivity than the first jacket 8 and is then arranged in the region of the maximum wall thickness maxW of the first jacket 8.
  • the additional element 20 is arranged for this purpose in the range of the minimum wall thickness minW or the maximum wall thickness maxW.
  • the additional element 20 is formed by coextrusion when covering the conductor 4.
  • FIGS. 4a, 4b show a further variant of the line 2.
  • This now has three wires 10, 14, 22, which in the present case are even similar and thus each azentrisch.
  • the third wire 22 thus has a third conductor 24, which is arranged acentrically in a third jacket 26.
  • a three-wire composite is formed by means of which the direction of a torsion can also be measured.
  • the three conductors 4, 6, 24 are for this purpose in pairs spaced apart at a respective distance A1, A2, A4, that is, the first conductor 4 and the second conductor 6 are spaced apart at a first distance A1, the second conductor 6 and the third conductor 24 are spaced apart from each other at a second distance A2, and the third conductor 24 and the first conductor 4 are spaced apart at a third distance A3.
  • A1, A2, A3 corresponding impedances. In the ground state of the line, ie in a torsion-free state, which is shown in Fig. 4a, at least two of the distances A1, A2, A3 are different in size.
  • the cores 10, 14, 22 are still surrounded by a common outer sheath in a variant which is not shown.
  • additional line elements are arranged in a likewise not-shown variant, e.g. Filling elements, strain relief, optical fibers, shielding, Beidrähte or the like.

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Abstract

L'invention concerne un conducteur, lequel s'étend dans une direction longitudinale et lequel est formé comme un capteur de torsion et comprend à cette fin un premier conducteur et un deuxième conducteur, le premier conducteur étant entouré d'un premier manteau, le premier conducteur et le premier manteau formant un premier brin, le premier conducteur n'étant pas disposé de manière centrée dans le premier manteau, le deuxième conducteur étant un conducteur de référence, le premier brin étant torsadé avec le conducteur de référence, une distance étant formée entre le premier conducteur et le deuxième conducteur, laquelle peut être modifiée par une torsion. L'invention concerne en outre un dispositif de mesure comprenant un tel conducteur ainsi qu'un procédé pour la mesure de la torsion d'un tel conducteur.
PCT/DE2019/100226 2018-03-15 2019-03-13 Conducteur, dispositif de mesure comprenant un conducteur ainsi que procédé pour la mesure d'une torsion d'un conducteur WO2019174677A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018204011.7A DE102018204011B4 (de) 2018-03-15 2018-03-15 Leitung, Messanordnung mit einer Leitung sowie Verfahren zur Messung einer Torsion einer Leitung
DE102018204011.7 2018-03-15

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WO2019174677A1 true WO2019174677A1 (fr) 2019-09-19

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