EP1847019A1 - Declencheur de proximite inductif base sur le principe du coefficient de couplage de transformateur - Google Patents

Declencheur de proximite inductif base sur le principe du coefficient de couplage de transformateur

Info

Publication number
EP1847019A1
EP1847019A1 EP06706739A EP06706739A EP1847019A1 EP 1847019 A1 EP1847019 A1 EP 1847019A1 EP 06706739 A EP06706739 A EP 06706739A EP 06706739 A EP06706739 A EP 06706739A EP 1847019 A1 EP1847019 A1 EP 1847019A1
Authority
EP
European Patent Office
Prior art keywords
coil
coils
receiving
proximity switch
switch according
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP06706739A
Other languages
German (de)
English (en)
Inventor
Thomas Kühn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pepperl and Fuchs SE
Original Assignee
Pepperl and Fuchs SE
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 Pepperl and Fuchs SE filed Critical Pepperl and Fuchs SE
Publication of EP1847019A1 publication Critical patent/EP1847019A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/9505—Constructional details
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/952—Proximity switches using a magnetic detector using inductive coils
    • H03K17/9525—Proximity switches using a magnetic detector using inductive coils controlled by an oscillatory signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/952—Proximity switches using a magnetic detector using inductive coils
    • H03K2017/9527—Details of coils in the emitter or receiver; Magnetic detector comprising emitting and receiving coils

Definitions

  • the invention relates to an inductive proximity switch based on the transformer coupling factor principle, comprising at least one transmitting coil, an oscillator circuit and at least two receiving coils arranged in the alternating magnetic field of the transmitting coil, the transmitting coil and the receiving coil being arranged adjacent to one another on a printed circuit board, and one The receiving coil connected evaluation circuit, which generates a switching signal when approaching a target to the proximity switch from the evaluation of the received signals of the receiving coils, according to the preamble of claim 1.
  • Inductive proximity switches are sensors which are non-contact on approach of a metallic or non-metallic object, target, d. H. without direct contact, react.
  • Inductive proximity switches two basic principles are known.
  • Either the heart of such a sensor is a current-carrying coil that generates a magnetic alternating field.
  • the alternating current is generated by an oscillator. If a metallic object, trigger or target, enters this magnetic field, the eddy current losses caused by the target are created, the resonant circuit is damped, whereby the oscillation amplitude changes.
  • This change can, electrically amplified, as a measure, for. B. be used for the distance of the target from the coil. Due to a hysteresis effect, the measured variable when moving the target in the direction of the proximity switch differs from that when moving in the opposite direction.
  • This design has disadvantages in principle, namely it requires a usually complex construction, a ferrite and a coil winding and high tolerance requirements for increased switching distances. Likewise, a lack of weld strength is given because the saturation of the ferrite leads to errors.
  • the coupling factor can usually be set between 0 (no coupling) and 1 (perfect coupling), where the coupling factor K determines the magnitude of the mutual inductance M of the circuit.
  • a target placed in the switching range of the proximity switch alters the coupling.
  • the coupling evaluation avoids the disadvantages described above; However, it has the disadvantage that it is not easy to realize because of the lower signal level in the prior art in turn so far.
  • the switching distance of a proximity switch is not critical to external electrical noise and in particular insensitive to its installation in a machine part and its installation conditions. Likewise, the switching distance should remain constant at different operating temperatures.
  • the reduction factor which is set to 1, based on iron. Other metals have a smaller reduction factor, which means that the switching distance at which the proximity switch switches is shorter than with iron. In today's proximity switches, a constant reduction factor of 1 is desired, meaning that all metals have the same or approximately the same switching distance. This is best achieved with inductive proximity switches according to the transformer coupling principle.
  • the proximity switch can distinguish, with different reduction factor, which metal is the triggering target.
  • an inductive proximity switch with an oscillator is known, which feeds a transmitting coil, which can be constructed with or without ferrite and generates an alternating magnetic field, wherein the oscillator by a penetrating into the alternating field metallic shutter in his Vibration state is affected, as well as with an evaluation circuit for obtaining a switching signal from the change of the vibration state.
  • the sensor coils are formed by their spatial position to each other and by the respective numbers of turns such that the differential AC voltage at the desired response distance to zero becomes. Since the two secondary coils are arranged in an opposite sense of winding, then the two induced mutual induction voltages add up to zero, so that the voltage zero or almost zero is applied to the terminals of the receiver coils.
  • the difference AC voltage is fed back to the input of the oscillator amplifier of the oscillator such that at a differential AC voltage zero of the oscillator changes its vibrational state abruptly.
  • the two secondary coils lie with their ring levels in a plane, wherein the secondary coils surround the transmitting coil in the middle between them so that the sensor coils have an equal distance from the transmitting coil.
  • the transmitting coil and the two sensor coils are arranged coaxially in different planes to each other, wherein the transmitting coil is arranged between the two sensor coils.
  • This arrangement is critical to mechanical deformations that may occur during use or when the proximity switch is heated. This in turn can result in faulty circuits as well as a change in the switching distance can occur.
  • the antiserial interconnection of the two secondary coils is associated with the disadvantage that the differential voltage is subject to considerable temperature dependence.
  • DE 103 18 350 B3 discloses a ferrite-free inductive proximity switch with a transmitting coil and a receiving coil arranged in its magnetic alternating field such that the magnetic flux impressed by the alternating magnetic field in the receiving coil is zero in the switching or rest position of the proximity switch or is close to zero, wherein the coils are arranged offset adjacent to each other, so that the emerging from the coil surface of the transmitting coil field lines that penetrate the coil surface of the receiving coil in one direction, the coil surface of the receiving coil also penetrate in the opposite direction.
  • the receiving coil has an annular coil surface, wherein the transmitting coil has a circular coil surface, the periphery of which is overlapped by the receiving coil all around. At least one coil is formed by a spiral conductor track of a printed circuit board.
  • the coil surface of the receiver coil is arranged opposite to the alternating magnetic field such that the field lines, which originate from the coil surface and pass through the coil surface of the receiver coil, also recede through the coil surface of the receiver coil.
  • the magnetic flux generated in the receiving coil ie the surface integral via the alternating magnetic field, is zero or close to zero there, whereby the voltage induced in the receiving coil is equal to zero or very low, if no other alternating fields are present are.
  • an overlap of transmitting coil and receiving coil means the presence of crossing points of the coil windings, so that such a coil structure without multilayer construction can not be applied to one and the same side of a circuit board. Or it may be the one coil on the top and the other coil are applied to the underside of a board, which also has a relatively expensive production result, but also limits the scope.
  • the first coil is disposed between the second and third coils.
  • a generator coil and a detector coil are applied on each individual circuit board.
  • the generator coils are either arranged in the center of the detector coils or the detector coils are arranged centrally.
  • the coils on the two circuit boards are connected to one another in such a way that by folding the printed circuit boards into the plane or out of the plane to the parallel position, the coils connected in series receive an identical or opposite winding sense.
  • the invention has for its object to provide a, preferably ferrite, inductive proximity switch, based on the transformer coupling factor principle, of the aforementioned type, which has a largely material-independent response or a reduction factor 1 or near 1 and against external DC and AC fields is largely resistant by the possibility of waiving ferritic materials is feasible.
  • the at least two receiving coils, as well as the transmitting coil each consist of at least one annular or elliptical or polygonal or spiral-shaped turn and each surround a circular or annular or polygonal or elliptical coil surface, wherein either the transmitting coil is peripherally surrounded by the first receiving coil and this in turn is peripherally surrounded by the second receiving coil, the first alternative, or the first receiving coil is surrounded by the second receiving coil and this is peripherally surrounded by the transmitting coil, 2nd alternative, so that in both alternatives with perpendicular parallel projection on the coils both spanned by the outermost coil coil surface completely covers the coil surfaces of all other coils and spanned by the innermost coil coil surface of The coil surfaces of all other coils is completely covered, and in perpendicular parallel projection on the coils, the transmitting coil is spaced from its adjacent receiving coil, without the projections of the coils overlap.
  • the second receiving coil may be surrounded by a third and possibly one or more peripheral receiving coils, wherein in the second alternative of claim 1, the outer receiving coil is peripherally surrounded by the transmitting coil.
  • the transmitting coil is surrounded by a first receiving coil, and this is in turn surrounded by the second receiving coil and optionally this from a third or n-th peripheral receiving coil, or a first receiving coil is from a second receiving coil and, if appropriate, this of a third or N th receiving coil surrounded, wherein the n-th receiving coil is peripherally surrounded by the transmitting coil, so that in both alternatives of claim 1, both the spanned by the respective outer coil surface coil area completely covers all coil surfaces of the other inner coils as well as in vertical Parallel projection on the coils, the transmitting coil or any other coil is spaced from the next adjacent receiving coil, without the vertical projections of transmitting and / or receiving coils overlap or intersect. Under “coil surface” is understood the spanned by the respective coil in a vertical projection surface.
  • the inductive proximity switch according to the invention has significant advantages over the prior art.
  • the proximity switch has a largely material-independent response or a reduction factor of 1 or close to 1, which is resistant or almost resistant to external DC and AC fields by largely dispensing with ferritic materials, and thus in a non-ferrite application high welding strength having.
  • the proximity switch according to the invention implements high switching distances, as well as its use complex, mechanically complex and costly multi-coil systems with conventional winding technology can be avoided with the problems of poor stability and reproducibility through the use of inexpensive circuit board coil system.
  • the proximity switch according to the invention makes it possible to obtain a high signal level and is easy to implement.
  • the proximity switch according to the invention it is possible to realize print coil arrangements with high temperature stability and reproducibility.
  • a planar arrangement of all conductor structures is present and no or only slight overlaps in perpendicular projection of the coils are present on each other.
  • Transmitter and receiver coils preferably do not overlap, as well as the receiver coils preferably do not overlap.
  • the inventive arrangement of transmitting and receiving coils to each other with no or only slight overlap causes the magnetic fluxes, which are generated by the transmitting coil in the receiving coil, not to zero or close to zero, but always clearly from zero are different and thus provide evaluable induction voltages.
  • the flux, integral across the receiving coil surfaces, is always distinctly different from zero. This also gives a smaller CTE of the PCB in the plane as well as an independence of layer distances.
  • the coil geometries of the coils are not limited to a circular or annular shape, but it can as far as possible all forms, such as a polygonal or annular or elliptical guided or shaped coil and coil surface shapes, are used.
  • the outermost coil, receiver coil or transmitter coil is surrounded by a peripherally arranged closed conductor track, wherein a closed conductor track can additionally be located between adjacent receiver coils.
  • a closed conductor track can additionally be located between adjacent receiver coils.
  • at least one closed conductor track can be located between adjacent receiver coils.
  • the inventive use of at least two or more independent receiving coils opens up the possibility of separately evaluating or linking their signals, so that, for example, linear combination or ratio formations of the two signals or of a plurality of signals are possible. This is possible because the magnetic fluxes in the receiver coils do not become zero or close to zero, but are always distinctly different from zero, thus providing evaluable induction voltages.
  • the turns of transmitting coil and receiving coils are in principle spiral arranged in a planar plane. In this way, printed coils can be easily produced.
  • the transmitting coil is circular, that is distributed over a circular area; the receiving coils are annular, peripherally surrounding the transmitting coil.
  • the inner first receiving coil is circular, that is distributed over a circular area or annular, and the other, the first receiving coil surrounding receiving coils including the outer transmitting coil are each annular coils, in both alternatives in perpendicular parallel projection on the coils these spaced apart are or can touch each other.
  • the coils thus formed are in the form of hollow polyhedra or hollow ellipsoids, or the turns of the coils span polyhedrons or ellipsoids of the thickness of the coil.
  • the proximity switch according to the invention is under a coil arrangement in a vertical parallel projection on the same in a further plane at least one more identical coil arrangement, whereby the coils of the coil assembly are divided into interconnected partial coils to different levels, which respective sub-coils arranged congruently one above the other and in the same direction in series, namely in series, as well as in the same direction are flowed through by the current.
  • the transmitting coil is in sub-coils, which are preferably connected in series, divided, which are preferably arranged congruently one above the other in two superimposed planes and flowed through in the same direction from the stream.
  • the in the receiving coils due to the magnetic flux changes are generated These voltage signals can be evaluated in the evaluation circuit according to the difference principle.
  • the same has a cylindrical construction with a metallic sleeve and concentric conductor structures of its coils.
  • the conductor structures in particular those of the receiver coils, can be open rings.
  • at least one of the coils, namely transmitting coil and / or receiving coils, may be formed by a spiral-shaped conductor track on or in a circuit board.
  • the proximity switch according to the invention is constructed without ferrite, whereby it has a high welding strength.
  • an inventive proximity switch can be used with a ferrite, wherein the ferrite, for example, as a disc, preferably with a small thickness, below the transmitting coil, in particular in a recess of the board, is arranged on or in the board.
  • a suitable and adapted field modeling can be achieved.
  • the projections of transmitting and / or receiving coils can also overlap or intersect slightly, which u.U. can be favorable manufacturing technology. Likewise, slight overlaps of the projection of the coils can be accepted in the peripheral region of the coils in projection, without thereby diminishing the advantages of the proximity switch according to the invention.
  • the influence of the installation attenuation of the proximity switch according to the invention can be largely reduced, so that with a suitable combination of the receiving voltages of the receiver coils in an evaluation circuit, the resulting output signal is almost only affected by the target.
  • the transmitting and / or receiving coils touch each other or overlap slightly in projection, so that the coils can touch each other in isolated turns and intersect in their projection. In this space-saving design, the advantages of the proximity switch according to the invention are retained.
  • the transmitting coil in deviation from claim 1, is arranged between two receiving coils, at least two receiving coils being present.
  • FIG. 1 shows the basic principle of the structure of a proximity switch according to the invention in plan view of a circuit board with a substantially circular surface-shaped transmitting coil, the winding of which is spiral, and with two surrounding, hollow cylindrical receiving coil and a peripherally extending around the receiving coils closed short circuit trace .
  • FIG. 1a is a view similar to Figure 1 of the coils, wherein between the inner and the outer receiving coil another, dashed line receiving coil is shown to indicate a plurality of other possible receiving coils,
  • FIG. 2 shows a further illustration of a coil arrangement in which the annular transmission coil is arranged peripherally on the outside and enclosed by the reception coils,
  • FIG. 3 shows a further illustration of a coil arrangement, wherein the turns of the coils for symbolic representation of virtually any possible design are polygonal and square,
  • FIG. 4 shows a cross section through a coil arrangement according to FIG. 1 within a housing of the proximity switch, which is arranged flush in a machine part,
  • FIG. 5 shows the course of the generated by the transmitting coil of Figures 1 and 4
  • FIG. 5 shows the course of the magnetic field H generated by the transmitting coil of FIGS. 1 and 4;
  • FIG. 6 shows a schematic cross section through a further proximity switch, which has coil assemblies of the same construction in two superposed planes, which are contacted and energized in the same direction to increase the number of turns of the individual coils;
  • Figure 8 shows another circuit example of an evaluation circuit for evaluating the signals from the receiving coils
  • FIG. 9 shows an alternative circuit example of a further evaluation circuit.
  • the transmitting coil S is preferably a flat coil with the radius rs and the circular coil surface Fs and with substantially helically wound turns (not shown) and the coil ends 1, 1 '.
  • the annular receiving coil E1 has substantially helically or circular wound turns, preferably in the form of a printed flat coil with the coil ends 2, 2 ';
  • the annular receiving coil E2 has substantially spirally to circular wound turns preferably in the form of a printed flat coil with the coil ends 3, 3 '.
  • the receiving coils E1 and E2 are arranged approximately concentrically around the transmitting coil S in a plane.
  • the radius r E i of the receiving coil E1 is greater than the maximum radius rs of the transmitting coil S; the radius ⁇ E2 of the receiving coil E2 is greater than the radius ⁇ EI of the receiving coil E1, so that the receiving coils are arranged approximately concentrically around the transmitting coil and the relationship applies: r s ⁇ r E i ⁇ E2-
  • the projections of the coils thus do not overlap ,
  • Each coil can also consist of only a single turn, which is also the shape of an open one Rings may have.
  • the spanned by the second receiving coil coil surface thus covers, seen in projection, the spool areas spanned by the first receiving coil and the spool of the transmitting coil completely.
  • the coil surface spanned by the first receiver coil completely covers the coil surface spanned by the transmitter coil in projection.
  • the requirement that the projections of the coils do not overlap means in other words that the coils do not touch or intersect in vertical projection, as can be seen for example from FIG. 1, but, as shown in FIG Example concentric and are spaced apart.
  • a slight overlap or a slight crossing or touching of the coils, with respect to the vertical projection is possible and permissible; while the advantages of the proximity switch remain largely intact.
  • the coil surfaces overlap, since, for example, according to FIG. 1, the coil surface of the inner receiver coil is arranged within the coil surface of the outer receiver coil and the coil surface of the transmitter coil is located therein.
  • the coil surface of each coil with the exception of the outermost coil, therefore lies completely within the coil surfaces of all coils located further out.
  • the arrangement of transmitting coil and receiving coils is interchangeable, so that a transmitting coil SA on a board P is peripherally outside and an annular coil with the coil ends 6, 6 'has.
  • the two likewise annular receiving coils 7, 8 with the coil ends 9, 9 'and 10, 10' are concentrically enclosed by the transmitting coil S A.
  • the shape and arrangement of the coils need not be concentric, but can be designed largely arbitrary; the shape may also be elliptical or polygonal, for example.
  • 3 shows an illustration of a coil arrangement on a square board P, wherein the turns of all the coils 11, 12, 13 are polygonal in shape and square, for example; 14 denotes a closed, peripherally arranged conductor track.
  • the decisive factor is that the surface enclosed by the outermost coil covers, preferably completely, the coil surfaces of the further coils that follow inwards, and thus the coil of the outermost coil completely surrounds the coil of the further coils adjacent to the inside, wherein the innermost one Receiving coil fully encloses the coil Fs of the transmitting coil 11: Fn (s> ⁇ Fi 2 ⁇ Fi 3.
  • Fn s> ⁇ Fi 2 ⁇ Fi 3.
  • Figures 1 and 2 thus show the basic structure of a printed circuit board coil system according to the invention using the example of a cylindrical proximity switch with cylindrically symmetrical structure preferably with a metallic sleeve (not shown).
  • the cylindrically symmetrical arrangement with concentric conductor structures can be replaced by an arrangement with, for example, fourfold symmetry for designing a sensor with a square front surface according to FIG. 3.
  • Central component is at least three, applied to a printed circuit board P conductor structures, which are operated as transmitting or receiving coils.
  • the coils in Figures 1, 1a and 2 are arranged concentrically to each other, preferably designed spirally and are in a plane.
  • the transmitting coil S is preferably a helically applied coil having a multiplicity of turns with the outer radius rs and any inner radius.
  • the receiving coils E1 and E2 each consist of at least one turn, optionally also of several, in the radial direction closely adjacent turns, with the mean radius ⁇ EI or Te 2 - Due to the planar arrangement of the
  • Coils occur, preferably, no spatial overlap of the projections of the
  • At least one concentrically arranged, continuous and annularly closed conductor track LB is provided, which either peripherally surrounds all the coils or is disposed within the innermost coil or is located between two adjacent coils, as shown in some of the figures.
  • Figure 4 shows schematically a cross section through a coil assembly according to the figure 1 within a housing 16 of a proximity switch, which is arranged flush in a machine part 17; Above the proximity switch and the machine part 17 there is a metallic target T, which is able to trigger a reaction or a response when approaching the switching distance of the proximity switch.
  • the oscillation of the oscillator depends on the position of the target. Basically, two operating modes of the proximity switch are possible. Either the oscillator oscillates in the absence of target T due to a small induced alternating field in the receiving coil. By approaching the target will be reached when the Sensing distance of this field disturbed or reduced so that the oscillation of the oscillator stops. Or the oscillation of the oscillator starts only when reaching the switching distance through the target.
  • the operating mode depends on the selected oscillator circuit.
  • FIG. 5 shows the course of the magnetic alternating field H generated by the transmitting coil S of FIGS. 1 and 4 and the penetration of the surfaces of the receiving coils E1 and E2 through the alternating field H. It can be seen that the alternating field H of the transmitting coil S, which has a large width, only slightly beyond the closed, peripherally arranged trace LB out and is constricted by the short-circuited conductor, so that due to this conductor LB and their placement more or less peripheral on the board P a targeted modeling of the alternating magnetic field can be achieved.
  • the closed interconnect LB which represents a short circuit, it is further achieved that different voltages are induced in the receiver coils not only because of their different radii, but also additionally due to the field modeling by the interconnect LB.
  • at least one annular closed-loop conveyor belt can be present between each two adjacent coils.
  • FIG. 6 shows a schematic cross-section through a further proximity switch, which has coil arrangements of the same design in two superposed planes, which are contacted with each other for increasing the number of turns of the individual coils.
  • the transmitting coil consists of the two parts S and S 1 , which are connected in such a way that the alternating magnetic fields of the partial coils S and S 1 increase.
  • the receiving coils are constructed of two parts E1 and E1 1 and E2 and E2 1 , wherein the respective partial coils preferably have the same number of turns.
  • the coil assemblies or conductor structures or partial coils may be offset in the axial direction and be reproduced one or more times, for Example in intermediate layers of a multi-layer printed circuit board, and are connected together so that the coils are connected in the same direction in series.
  • the transmitting coil and the receiving coil can preferably be close to each other without touching each other.
  • the coils can also touch isolated turns or overlap slightly when viewed in a vertical projection.
  • the differential voltage can be formed in the simplest way by antiserial interconnection of the receiver coils. However, it is also conceivable to detect and evaluate both received voltages separately from each other or to link them together in a linear or non-linear network and to evaluate the resulting output signal.
  • suitable choice of the radii r ⁇ i and ⁇ E2 of the receiving coils is thus achieved that at installation attenuation, the receiving voltages UEI and UE2 in the receiving coils E1 and E2 change by the same amount ⁇ u and thus be converted into a "common-lvlode" signal.
  • this effect can thus be eliminated.
  • the receiving voltages UEI and UEI change by different amounts ⁇ UEI and ⁇ UE2, respectively, and furthermore, both the individual voltages and any difference are clearly different from zero.
  • suitable choice of the radii of the receiving coils of the influence of the installation attenuation can be largely reduced, so that with a suitable combination of the received voltages in a network, the resulting output practically depends only on the influence of the target.
  • FIG. 7 shows a circuit example of an evaluation circuit in which the transmission coil S, which is acted on by an oscillator generator Gen, is connected in series with a sensor resistance R.
  • the voltage UR dropping across the resistor R and the voltages UEI and UE2 induced in the receiver coils E1 and E2 are supplied to the network NW, amplified and linked together there.
  • FIG. 8 shows the circuit diagram of a further evaluation circuit.
  • FIG. 9 shows an alternative circuit example of a further evaluation circuit without feedback.
  • a proximity switch is characterized for example by the following dimensions: When using two receiving coils E1, E2 and a transmitting coil S, the outer radius r s of the transmitting coil S to the radii r E i, fe of the receiving coils E1, E2 behaves as 3.75 mm -r s : 4,7mm-rEi: 6,7mm-rE2 ⁇ 25% tolerance.
  • the radius ( ⁇ L B) of the trace (LB) at the radii (r E i, rE2) of the receiving coils (E1.E2) is 3.75mm (rs): 4, 7mm (r E i): 6.7mm (r E 2) ⁇ 25% tolerance, 7.1mm.
  • the object of the invention is particularly suitable for the construction of ferrite proximity switches, which are in particular ferrite, but may also have a ferrite for special applications.

Landscapes

  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Electronic Switches (AREA)

Abstract

La présente invention concerne un déclencheur de proximité inductif de préférence sans ferrite, comprenant: au moins une bobine émettrice (S); un circuit d'oscillateur; et au moins deux bobines réceptrices (E1, E2, Ei, En) disposées dans le champ magnétique alternatif de la bobine émettrice, la bobine émettrice et les bobines réceptrices étant disposées à proximité les unes des autres sur une platine; ainsi qu'un circuit d'évaluation connecté aux bobines réceptrices et destiné à évaluer le signal de réception des bobines réceptrices lors du rapprochement d'une cible au niveau du déclencheur de proximité. Les bobines réceptrices, ainsi que la bobine émettrice consistent en au moins un enroulement de forme polygonale, annulaire ou elliptique, et délimitent respectivement une surface de bobine de forme correspondant. Selon l'invention, soit la bobine émettrice est entourée par une première bobine réceptrice (E1) qui est elle-même entourée par la deuxième bobine réceptrice (E2), cette dernière étant éventuellement entourée par une troisième ou par une énième bobine réceptrice périphérique (Ei, En), soit les bobines réceptrices sont entourées par la bobine émettrice de sorte que d'une part la surface de bobine délimitée par la bobine extérieure respective, recouvre complètement toutes les surfaces de bobine délimitées par les autres bobines qui se trouvent plus à l'intérieur, et d'autre part, la bobine émettrice est espacée de la bobine réceptrice voisine, sans que les bobines émettrice et/ou réceptrice se recouvrent.
EP06706739A 2005-02-08 2006-02-08 Declencheur de proximite inductif base sur le principe du coefficient de couplage de transformateur Withdrawn EP1847019A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102005005831 2005-02-08
DE102005012892 2005-03-17
PCT/EP2006/001097 WO2006084675A1 (fr) 2005-02-08 2006-02-08 Declencheur de proximite inductif base sur le principe du coefficient de couplage de transformateur

Publications (1)

Publication Number Publication Date
EP1847019A1 true EP1847019A1 (fr) 2007-10-24

Family

ID=36590162

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06706739A Withdrawn EP1847019A1 (fr) 2005-02-08 2006-02-08 Declencheur de proximite inductif base sur le principe du coefficient de couplage de transformateur

Country Status (3)

Country Link
US (1) US7463020B2 (fr)
EP (1) EP1847019A1 (fr)
WO (1) WO2006084675A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007009994A1 (de) * 2007-03-01 2008-09-04 Robert Bosch Gmbh Induktiver Sensor
US8258777B2 (en) * 2009-09-04 2012-09-04 Weihua Chen Inductive proximity sensor
JP5558902B2 (ja) * 2010-04-28 2014-07-23 日立コンシューマエレクトロニクス株式会社 運動機能解析装置
US8704513B2 (en) * 2011-02-16 2014-04-22 Olympus Ndt Inc. Shielded eddy current coils and methods for forming same on printed circuit boards
CN102829751B (zh) * 2011-06-15 2015-09-09 北汽福田汽车股份有限公司 角度测量装置、测量方法及具有该角度测量装置的汽车
DE102013222936A1 (de) * 2012-11-09 2014-05-15 Elmos Semiconductor Ag Spule für einen induktiven Sensor und Schaltung zu dessen Ansteuerung
DE102013205910A1 (de) 2013-04-04 2014-10-09 Robert Bosch Gmbh Objektsuchgerät und Verfahren zum Orten eines metallischen und/oder magnetisierbaren Objekts
CN103472488B (zh) * 2013-09-18 2016-02-10 安徽惠洲地质安全研究院股份有限公司 用于瞬变电磁勘探的pcb线圈板
CN106716837B (zh) * 2014-08-22 2020-12-11 巴鲁夫公司 具有集成设计的感应式接近度传感器
CN106716836B (zh) * 2014-09-09 2020-11-20 巴鲁夫公司 感应式接近度传感器或距离传感器的传感器元件和用于操作所述传感器元件的方法
CN104266665B (zh) * 2014-09-17 2016-09-28 上海兰宝传感科技股份有限公司 电感式传感器
CN105172840A (zh) * 2015-09-29 2015-12-23 沧州师范学院 一种电路板及道岔密贴检测装置和检测方法
US10393908B2 (en) 2016-12-15 2019-08-27 Rockwell Automation Technologies, Inc. Bobbin construction and coil winding method
US11525701B2 (en) * 2018-01-22 2022-12-13 Melexis Technologies Sa Inductive position sensor
EP3514502B1 (fr) * 2018-01-22 2021-07-14 Melexis Technologies SA Capteur de position inductif

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59190718A (ja) * 1983-04-13 1984-10-29 Omron Tateisi Electronics Co 近接スイツチ
DE19700753A1 (de) * 1997-01-11 1998-07-16 Schott Glaswerke Vorrichtung und Verfahren zur Erkennung des Vorhandenseins und/oder der Größe von metallischen Töpfen auf einer Heiz- oder Kochzone
US20020039023A1 (en) * 2000-09-29 2002-04-04 Manfred Jagiella Inductive sensor
JP2002148003A (ja) * 2000-11-07 2002-05-22 Omron Corp 近接センサ

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3615652C2 (de) * 1986-05-09 1995-08-10 Foerster Inst Dr Friedrich Induktives Suchgerät
DE3840532A1 (de) * 1988-12-01 1990-06-07 Pepperl & Fuchs Verfahren zur induktiven erzeugung eines elektrischen messsignals zur bestimmung des weges und/oder der position im raum und/oder von materialeigenschaften eines pruefkoerpers und nach diesem verfahren aufgebauter naeherungssensor und verwendung desselben als naeherherungsschalter
US5801530A (en) * 1995-04-17 1998-09-01 Namco Controls Corporation Proximity sensor having a non-ferrous metal shield for enhanced sensing range
US5721489A (en) 1995-10-06 1998-02-24 Garrett Electronics, Inc. Metal detector method for identifying target size
DE19850749C1 (de) * 1998-11-04 2000-03-30 Eckart Hiss Sensor
US7301334B2 (en) * 2001-09-17 2007-11-27 Schneider Electric Industries Sas Micro magnetic proximity sensor system
DE10362165A1 (de) 2003-04-23 2006-12-28 Werner Turck Gmbh & Co. Kg Induktiver Näherungsschalter
EP1526645B1 (fr) * 2003-10-20 2011-11-23 Werner Turck GmbH & Co. KG Commutateur de proximité inductif avec enroulements différentiels

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59190718A (ja) * 1983-04-13 1984-10-29 Omron Tateisi Electronics Co 近接スイツチ
DE19700753A1 (de) * 1997-01-11 1998-07-16 Schott Glaswerke Vorrichtung und Verfahren zur Erkennung des Vorhandenseins und/oder der Größe von metallischen Töpfen auf einer Heiz- oder Kochzone
US20020039023A1 (en) * 2000-09-29 2002-04-04 Manfred Jagiella Inductive sensor
JP2002148003A (ja) * 2000-11-07 2002-05-22 Omron Corp 近接センサ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2006084675A1 *

Also Published As

Publication number Publication date
WO2006084675A1 (fr) 2006-08-17
US20080204118A1 (en) 2008-08-28
US7463020B2 (en) 2008-12-09

Similar Documents

Publication Publication Date Title
EP1847019A1 (fr) Declencheur de proximite inductif base sur le principe du coefficient de couplage de transformateur
EP0479078B1 (fr) Commutateur de proximité inductif
EP1797462B1 (fr) Capteur pour localiser des objets metalliques et methode pour evaluer les signaux de mesure d'un capteur de ce type
DE4031252C1 (en) Inductive proximity switch - detects coil induced voltage difference which is fed to input of oscillator amplifier
DE2449697C3 (de) Mechanisch-elektrischer Meßumformer
DE10318350B3 (de) Induktiver Näherungsschalter
EP2742368B1 (fr) Capteur permettant de localiser des objets métalliques
DE60206201T2 (de) Linearer Positionssensor ohne Kontakt
DE102006053023B4 (de) Induktiver Näherungsschalter
DE60130700T2 (de) Induktiver Positionsgeber
WO1999034170A1 (fr) Transducteur de mesure inductif pour trajets et dispositif de mesure des angles
DE102008037893B4 (de) Induktiver Leitungsfähigkeitssensor
DE10057773B4 (de) Näherungsschalter
DE102009042940A1 (de) Positionsmesseinrichtung mit sich mehrfach kreuzender Senderwindungsanordnung
WO2014023605A1 (fr) Interrupteur de proximité à induction
DE4102542A1 (de) Induktiver naeherungsschalter
DE3225166A1 (de) Metalldetektor
EP0554417B1 (fr) Dispositif de mesure pour la determination sans contact du deplacement ou de l'angle de rotation d'un composant
DE202006004158U1 (de) Induktiver Näherungsschalter basierend auf dem transformatorischen Kopplungsfaktor-Prinzip
EP1685365A2 (fr) Systeme de mesure de deplacement fonctionnant sans contact
DE102006011483A1 (de) Induktiver Näherungsschalter
DE202006003990U1 (de) Induktiver Näherungsschalter
DE3929681A1 (de) Messeinrichtung zur erfassung eines wegs oder eines drehwinkels
WO2012113361A1 (fr) Capteur inductif
DE102007010467B4 (de) Induktiver Näherungsschalter

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20070824

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20080527

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: FIRMA PEPPERL + FUCHS GMBH

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20170207