DE102012214330B3 - Inductive proximity switch for use as contactless working electronic switching device in automatic control engineering field, has receiving coils that are arranged in outer region of winding body - Google Patents
Inductive proximity switch for use as contactless working electronic switching device in automatic control engineering field, has receiving coils that are arranged in outer region of winding body Download PDFInfo
- Publication number
- DE102012214330B3 DE102012214330B3 DE201210214330 DE102012214330A DE102012214330B3 DE 102012214330 B3 DE102012214330 B3 DE 102012214330B3 DE 201210214330 DE201210214330 DE 201210214330 DE 102012214330 A DE102012214330 A DE 102012214330A DE 102012214330 B3 DE102012214330 B3 DE 102012214330B3
- Authority
- DE
- Germany
- Prior art keywords
- coil
- proximity switch
- inductive proximity
- coils
- bobbin
- 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.)
- Active
Links
- 230000001939 inductive effect Effects 0.000 title claims description 18
- 238000004804 winding Methods 0.000 title abstract description 7
- 239000000919 ceramic Substances 0.000 claims abstract description 23
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 238000013016 damping Methods 0.000 claims description 7
- SWPMTVXRLXPNDP-UHFFFAOYSA-N 4-hydroxy-2,6,6-trimethylcyclohexene-1-carbaldehyde Chemical compound CC1=C(C=O)C(C)(C)CC(O)C1 SWPMTVXRLXPNDP-UHFFFAOYSA-N 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000003993 interaction Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000002241 glass-ceramic Substances 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000002775 capsule Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
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
- H03K17/952—Proximity switches using a magnetic detector using inductive coils
- H03K17/9537—Proximity switches using a magnetic detector using inductive coils in a resonant circuit
- H03K17/954—Proximity switches using a magnetic detector using inductive coils in a resonant circuit controlled by an oscillatory signal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F17/0013—Printed inductances with stacked layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
-
- 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
- H03K2017/9527—Details of coils in the emitter or receiver; Magnetic detector comprising emitting and receiving coils
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electronic Switches (AREA)
- Switches That Are Operated By Magnetic Or Electric Fields (AREA)
Abstract
Description
Die Erfindung betrifft einen berührungslos arbeitenden induktiven Näherungsschalter nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a non-contact inductive proximity switch according to the preamble of
Induktive Näherungsschalter werden als berührungslos arbeitende elektronische Schaltgeräte vor allem in der Automatisierungstechnik eingesetzt. Insbesondere sind nach dem transformatorischen Prinzip arbeitende induktive Näherungsschalter bekannt. Sie sind in der Automatisierungstechnik weit verbreitet und werden deshalb in großer Stückzahl produziert. Die meisten Geräte werden mit einem fest eingestellten Schaltabstand ausgeliefert.Inductive proximity switches are used as non-contact electronic switching devices, especially in automation technology. In particular, according to the transformer principle working inductive proximity switches are known. They are widely used in automation technology and are therefore produced in large quantities. Most devices are shipped with a fixed switching distance.
Mit einer Sendespule wird ein elektromagnetisches von einem metallischen Auslöser beeinflussbares Magnetfeld erzeugt. Die Beeinflussung des Magnetfeldes durch den metallischen Auslöser wird elektronisch ausgewertet und in als binäres Schaltsignal über eine Schaltstufe ausgegeben. Solche Schaltgeräte werden in den verschiedensten Ausführungen unter anderem auch von der Anmelderin hergestellt und vertrieben. Zur Realisierung des transformatorischen Prinzips sind mindestens eine Sendespule und eine induktiv mit der Sendespule gekoppelte Empfangsspule notwendig. Die wesentliche Messgröße ist der transformatorische Koppelfaktor zwischen den beiden Spulen. Der transformatorische Koppelfaktor der beiden Spulen ist vom metallischen Auslöser beeinflussbar. Der Grad der Beeinflussung wirkt sich auf das Signal an der Empfangsspule aus. In Abhängigkeit von den Eigenschaften des Auslösers können auch Phasenverschiebungen entstehen, die entsprechend dem Auswerteverfahren in unterschiedlicher Weise zum Messergebnis beitragen. Beim Eindringen eines auch als Target, Schalt- oder Steuerfahne bezeichneten metallischer Auslösers in den Überwachungsbereich des Näherungsschalters wird, wie bereits ausgeführt, der transformatorische Koppelfaktor des von den beiden Spulen gebildeten Transformators beeinflusst und abhängig von der konkreten Ausführungsform des Näherungsschalters entweder ein Schaltsignal ausgelöst wenn das Signal an der Sendespule oder an der Empfangsspule einen bestimmten Wert überschreitet, oder wenn es diesen Wert unterschreitet.With a transmitting coil, an electromagnetic magnetic field can be influenced by a metallic trigger. The influence of the magnetic field by the metallic trigger is evaluated electronically and output as a binary switching signal via a switching stage. Such switching devices are manufactured and distributed in various designs, inter alia, by the Applicant. To implement the transformer principle, at least one transmitting coil and one receiving coil inductively coupled to the transmitting coil are necessary. The essential measure is the transformer coupling factor between the two coils. The transformer coupling factor of the two coils can be influenced by the metallic release. The degree of influence affects the signal at the receiving coil. Depending on the characteristics of the trigger, it is also possible for phase shifts to occur, which contribute to the measurement result in different ways in accordance with the evaluation method. When penetrating a designated as a target, switching or control flag metallic trigger in the surveillance area of the proximity switch, as already stated, the transformer coupling factor of the transformer formed by the two coils influenced and depending on the specific embodiment of the proximity switch either a switching signal when the Signal on the transmitter coil or on the receiver coil exceeds a certain value, or if it falls below this value.
Da die Bewertung meist anhand der Signalamplitude erfolgt, wird das hochfrequente Signal gleichgerichtet, geglättet und einem Komparator zugeführt. Es kann aber auch digitalisiert und in einem Mikrocontroller verarbeitet werden.Since the evaluation is usually based on the signal amplitude, the high-frequency signal is rectified, smoothed and fed to a comparator. It can also be digitized and processed in a microcontroller.
Dabei kann sowohl die Ansteuerung der Sendespule als auch die Bewertung des Einflusses des metallischen Auslösers auf unterschiedliche Art erfolgen. In manchen Fällen ist die Sendespule Bestandteil eines durch den metallischen Auslöser beeinflussbaren Oszillators. Es gibt aber auch von einem HF-Generator fremdgesteuerte Sendespulen. Die Wechselwirkung mit dem metallischen Auslöser ist allerdings auf das Nahfeld beschränkt. Deshalb nimmt sie etwa mit der 3-fachen Potenz des Schaltabstandes ab. Um auch noch geringe Wechselwirkungen mit dem metallischen Auslöser nachweisen zu können, ist es vorteilhaft, das Signal im unbeeinflussten Zustand zu kompensieren und nur die vom Auslöser hervorgerufenen Änderungen auszuwerten. Dazu werden vorzugsweise zwei Empfangspulen in Differenzschaltung betrieben. Der Aufbau wird so gewählt, dass eine der beiden Spulen stärker vom Auslöser beeinflusst wird als die andere. Durch Nullabgleich im unbeeinflussten Zustand erhält man eine sehr empfindliche Differenzspulenanordnung. Diese wird so abgeglichen, dass sich die Signale der beiden Empfangsspulen im unbeeinflussten, bzw. in einem bestimmten Zustand gegenseitig aufheben. Je besser dieser Abgleich gelingt, umso höher kann man das Sensorsignal verstärken, ohne dass es zu einer Übersteuerung des Verstärkers kommt. Da das Magnetfeld und damit auch die Wechselwirkung der Spulenanordnung mit dem metallische Auslöser mit wachsender Entfernung schnell abnimmt, können Temperatureinflüsse, insbesondere Lageänderungen der Kupferwicklungen, aber auch der Temperaturgang der übrigen beteiligten Materialien und Bauelemente Signaländerungen hervorrufen, die in der gleichen Größenordnung wie das zu erwartende Sensorsignal liegen. Deshalb sind höhere Schaltabstände nur dann erreichbar, wenn die Temperaturabhängigkeit der Anordnung über den gesamten Arbeitstemperaturbereich kompensiert werden kann. Dieses Gleichgewicht kann schon durch Verguß der Geräte während der Fertigung, aber auch durch die Einbausituation am Einsatzort gestört werden. Ein werksseitiger Abgleich der Differenzspulenanordnung bei der Fertigung kann das Problem nur für einen engen Temperaturbereich beseitigen.In this case, both the control of the transmitting coil and the evaluation of the influence of the metallic trigger can be done in different ways. In some cases, the transmitting coil is part of an oscillator which can be influenced by the metallic trigger. But there are also externally controlled transmission coils by an HF generator. However, the interaction with the metallic trigger is limited to the near field. Therefore, it decreases approximately with the 3-fold power of the switching distance. In order to be able to detect even minor interactions with the metallic trigger, it is advantageous to compensate the signal in the uninfluenced state and to evaluate only the changes caused by the trigger. For this purpose, preferably two receiver coils are operated in differential circuit. The design is chosen so that one of the two coils is more affected by the trigger than the other. Zeroing in the uninfluenced state results in a very sensitive differential coil arrangement. This is adjusted so that cancel the signals of the two receiving coils in the uninfluenced, or in a particular state each other. The better this balance is achieved, the higher the sensor signal can be amplified without the amplifier overdriving. Since the magnetic field and thus also the interaction of the coil assembly with the metallic release rapidly decreases with increasing distance, temperature influences, in particular changes in position of the copper windings, but also the temperature coefficient of the other materials and components involved can cause signal changes in the same order of magnitude as the expected Sensor signal lie. Therefore, higher switching distances can only be achieved if the temperature dependence of the arrangement over the entire operating temperature range can be compensated. This balance can be disturbed by encapsulation of the equipment during production, but also by the installation situation at the site. A factory adjustment of the differential coil assembly in manufacturing can eliminate the problem only for a narrow temperature range.
Um die Empfindlichkeit zu erhöhen, und gleichzeitig unerwünschte Einflüsse zu unterdrücken, wird in der
Deshalb wird in der
Aus diesem Grund wird in der
Die
Die
Die
Die Aufgabe der Erfindung besteht darin, die Nachteile des Standes der Technik zu überwinden, und einen kompakten, langzeitstabilen und temperaturunempfindlichen induktiven Näherungsschalter anzugeben.The object of the invention is to overcome the disadvantages of the prior art, and to provide a compact, long-term stable and temperature insensitive inductive proximity switch.
Diese Aufgabe wird erfindungsgemäß durch die im Patentanspruch 1 angegebenen Merkmale gelöst. In den Unteransprüchen sind vorteilhafte Ausgestaltungen der Erfindung angegeben.This object is achieved by the features specified in
Der wesentliche Erfindungsgedanke besteht darin, alle drei Spulen der Differenzspulenanordnung in einem monolithischen Spulenkörperblock mit hoher Maßhaltigkeit und geringem thermischen Ausdehnungskoeffizienten unterzubringen. In vorteilhafter Weise besteht der Spulenkörperbloch aus einer LTCC-Glaskeramik, Low Temperature Co-fired Ceramics, die einen Wärmeausdehnungskoeffizienten von 6–8 ppm/K und die gewünschte hohe Maßhaltigkeit aufweist.The essential idea of the invention is to accommodate all three coils of the differential coil assembly in a monolithic bobbin block with high dimensional accuracy and low thermal expansion coefficient. Advantageously, the bobbin hole consists of an LTCC glass ceramic, Low Temperature Co-fired Ceramics, which has a thermal expansion coefficient of 6-8 ppm / K and the desired high dimensional stability.
Die bekannten Leiterplattenspulen auf der Grundlage des Leiterplattenmaterials FR4 erreichen nicht die notwendige thermische Stabilität. Der Sensorspulenaufbau ist erfindungsgemäß als mehrlagige Keramik in LTCC-Technik ausgeführt. Hierbei werden die Spulen im Siebdruckverfahren Lage für Lage auf die ungebrannte (grüne) Keramik gedruckt. Die Leiterbahnen bestehen vorzugsweise aus Silber. Nach dem Stapeln und Pressen wird der der vielschichtige Aufbau bei etwa 900°C in einem Prozessofen gebrannt. Bei Bedarf können auch Kondensatoren, Abschirmgitter und/oder eine Metallstruktur zur Vorbedämpfung der Referenzspule in den Keramikkörper eingebracht werden. Durch den erfindungsgemäßen Aufbau wird auch die thermische Kopplung der Spulen verbessert. Ein Vorteil der LTCC-Keramik gegenüber anderer Keramik sind ihre geringen dielektrischen Verluste. Die Permittivität der Keramik liegt etwa bei 7.The known printed circuit board coils based on the printed circuit board material FR4 do not achieve the necessary thermal stability. The sensor coil assembly according to the invention is designed as a multilayer ceramic in LTCC technology. In this process, the bobbins are screen printed on the unfired (green) ceramic layer by layer. The conductor tracks are preferably made of silver. After stacking and pressing, the multi-layered construction is fired at about 900 ° C in a process furnace. If required, it is also possible to introduce capacitors, shielding gratings and / or a metal structure for pre-damping the reference coil into the ceramic body. The construction according to the invention also improves the thermal coupling of the coils. One advantage of LTCC ceramics over other ceramics is their low dielectric loss. The permittivity of the ceramic is about 7.
Die Erfindung wird anhand der Zeichnung näher erläutert. Es zeigen:The invention will be explained in more detail with reference to the drawing. Show it:
Die
Durch die phasenrichtige Auswertung werden Störungen weitgehend ausgeblendet. Allerdings gehen auch vom Auslöser
Die
Die
Die übrigen Schaltelemente wurden bereits erläutert. Die Auswerteschaltung
Die
Die Erfindung betrifft einen induktiven Näherungsschalter mit einem Oszillator
In einer vorteilhaften Ausgestaltung der Erfindung besteht der Spulenkörper
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 11
- Oszillator, HochfrequenzgeneratorOscillator, high-frequency generator
- 22
- Sendespuletransmitting coil
- 33
- Empfangsschaltungreceiving circuit
- 4a4a
- Empfangsspule (1. Empfangsspule)Receiver coil (1st receiver coil)
- 4b4b
- Referenzspule (2. Empfangsspule)Reference coil (2nd receiving coil)
- 55
- Metallischer Auslöser, TargetMetallic trigger, target
- 66
-
Spulenkörper mit Sendespule
2 und Empfangsspulenpaar4 Bobbin with transmittingcoil 2 and receiving coil pair4 - 77
- VorbedämpfungsflächeVorbedämpfungsfläche
- 88th
- SchwingkreiskapazitätResonant circuit capacitance
- 99
- Multiplizierermultipliers
- 1010
- Kontaktfläche am SpulenkörperContact surface on the bobbin
- 1111
- Frontflächefront surface
- 1212
- Stecker mit Gewindeanschluss M8 × 1Plug with threaded connection M8 × 1
- AA
- Schaltausgangswitching output
- Ubub
- Betriebsspannungoperating voltage
- RaRa
- Abgleichwiderstandbalancing resistor
Claims (7)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201210214330 DE102012214330B3 (en) | 2012-08-10 | 2012-08-10 | Inductive proximity switch for use as contactless working electronic switching device in automatic control engineering field, has receiving coils that are arranged in outer region of winding body |
US14/405,540 US20150145348A1 (en) | 2012-08-10 | 2013-07-30 | Inductive proximity switch |
CN201380041672.0A CN104521142B (en) | 2012-08-10 | 2013-07-30 | Inductive proximity switch |
PCT/EP2013/065949 WO2014023605A1 (en) | 2012-08-10 | 2013-07-30 | Inductive proximity switch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201210214330 DE102012214330B3 (en) | 2012-08-10 | 2012-08-10 | Inductive proximity switch for use as contactless working electronic switching device in automatic control engineering field, has receiving coils that are arranged in outer region of winding body |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102012214330B3 true DE102012214330B3 (en) | 2014-04-03 |
Family
ID=50276552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE201210214330 Active DE102012214330B3 (en) | 2012-08-10 | 2012-08-10 | Inductive proximity switch for use as contactless working electronic switching device in automatic control engineering field, has receiving coils that are arranged in outer region of winding body |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102012214330B3 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019129238B3 (en) * | 2019-10-30 | 2021-03-18 | Ifm Electronic Gmbh | Inductive proximity sensor with a circuit for determining the inductance |
EP3961926A1 (en) * | 2020-08-31 | 2022-03-02 | Melexis Bulgaria Ltd. | Proximity sensor device and system |
EP4102723A1 (en) * | 2021-06-10 | 2022-12-14 | Turck Holding GmbH | Proximity sensor |
EP4145703A1 (en) * | 2021-09-03 | 2023-03-08 | Turck Holding GmbH | Miniaturized inductive proximity sensor and method for detecting a detection body |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4102542A1 (en) * | 1991-01-29 | 1992-07-30 | Turck Werner Kg | Inductive proximity switch with constant trigger distance - has oscillator producing magnetic field influenced by difference between field sensing coil voltages |
DE10012830A1 (en) * | 2000-03-16 | 2001-09-20 | Turck Werner Kg | Electronic proximity switch e.g. capacitive proximity switch for shaft encoder, includes mixer which evaluates interference caused by proximity of trigger after signal to be evaluated is admitted to oscillator frequency |
DE10350733B4 (en) * | 2003-10-20 | 2006-04-27 | Werner Turck Gmbh & Co. Kg | Inductive proximity switch with difference coil arrangement has coils of receiving coil arrangement arranged and connected so stimulation field produces difference voltage, compensation coil pair almost uninfluenced by eddy current field |
DE102010009576A1 (en) * | 2009-02-27 | 2010-11-04 | Ifm Electronic Gmbh | Inductive proximity switch operating method for use in automation engineering, involves performing control intervention on side of reception coils to minimize difference between output and reference signals |
DE102012203449A1 (en) * | 2011-04-13 | 2012-10-18 | Ifm Electronic Gmbh | Inductive proximity switch used as contactless operating electronic switching device used in e.g. automation field, has sealant made of glass which completely surrounds coil and associated bobbin or coil core |
DE102011088752A1 (en) * | 2011-12-15 | 2013-06-20 | Ifm Electronic Gmbh | Inductive proximity switch, particularly all-metal inductive proximity switch for reacting to approach of electrically conductive object, has inductor formed as low temperature penetrating ceramic body with conductor path as shielding layer |
-
2012
- 2012-08-10 DE DE201210214330 patent/DE102012214330B3/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4102542A1 (en) * | 1991-01-29 | 1992-07-30 | Turck Werner Kg | Inductive proximity switch with constant trigger distance - has oscillator producing magnetic field influenced by difference between field sensing coil voltages |
DE10012830A1 (en) * | 2000-03-16 | 2001-09-20 | Turck Werner Kg | Electronic proximity switch e.g. capacitive proximity switch for shaft encoder, includes mixer which evaluates interference caused by proximity of trigger after signal to be evaluated is admitted to oscillator frequency |
DE10350733B4 (en) * | 2003-10-20 | 2006-04-27 | Werner Turck Gmbh & Co. Kg | Inductive proximity switch with difference coil arrangement has coils of receiving coil arrangement arranged and connected so stimulation field produces difference voltage, compensation coil pair almost uninfluenced by eddy current field |
DE102010009576A1 (en) * | 2009-02-27 | 2010-11-04 | Ifm Electronic Gmbh | Inductive proximity switch operating method for use in automation engineering, involves performing control intervention on side of reception coils to minimize difference between output and reference signals |
DE102012203449A1 (en) * | 2011-04-13 | 2012-10-18 | Ifm Electronic Gmbh | Inductive proximity switch used as contactless operating electronic switching device used in e.g. automation field, has sealant made of glass which completely surrounds coil and associated bobbin or coil core |
DE102011088752A1 (en) * | 2011-12-15 | 2013-06-20 | Ifm Electronic Gmbh | Inductive proximity switch, particularly all-metal inductive proximity switch for reacting to approach of electrically conductive object, has inductor formed as low temperature penetrating ceramic body with conductor path as shielding layer |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019129238B3 (en) * | 2019-10-30 | 2021-03-18 | Ifm Electronic Gmbh | Inductive proximity sensor with a circuit for determining the inductance |
EP3961926A1 (en) * | 2020-08-31 | 2022-03-02 | Melexis Bulgaria Ltd. | Proximity sensor device and system |
US12018963B2 (en) | 2020-08-31 | 2024-06-25 | Melexis Bulgaria Ltd. | Proximity sensor device and system |
EP4102723A1 (en) * | 2021-06-10 | 2022-12-14 | Turck Holding GmbH | Proximity sensor |
EP4145703A1 (en) * | 2021-09-03 | 2023-03-08 | Turck Holding GmbH | Miniaturized inductive proximity sensor and method for detecting a detection body |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1797462B1 (en) | Sensor for locating metallic objects and method for evaluating measurement signals of a sensor of this type | |
EP1797464B1 (en) | Detector for locating metallic objects | |
EP0179384B1 (en) | Interfering fields-insensitive proximity switch | |
DE3910297C2 (en) | ||
WO2014023605A1 (en) | Inductive proximity switch | |
EP1797463B1 (en) | Device for locating metallic objects and method for adjusting such a device | |
DE102006053222B4 (en) | Inductive proximity switch with supplementary coil attached to a screen | |
DE102012214330B3 (en) | Inductive proximity switch for use as contactless working electronic switching device in automatic control engineering field, has receiving coils that are arranged in outer region of winding body | |
WO2006084675A1 (en) | Inductive proximity switch based on a transformer coupling factor principle | |
EP2904429B1 (en) | Method and sensor unit for locating and/or detecting metallic or metal-containing objects and materials | |
WO2016037597A1 (en) | Sensor element of an inductive proximity or distance sensor, and method for operating the sensor element | |
DE102013226203A1 (en) | Offset compensated position measuring device | |
WO2009071375A1 (en) | Sensor for the depth-selective detection of dielectric materials, and method for operating such a sensor | |
DE102008034577A1 (en) | Current measuring arrangement, has electrically conductive flat diamagnetic or paramagnetic shielding element lying with respect to sensor arrangement and comprising surface partially covers measuring circuit of sensor arrangement | |
DE10057773A1 (en) | Proximity switch with coil made up of several partial coils in series | |
DE102012220275A1 (en) | Inductive proximity switch for use as contactless working electronic switching device in automatic control engineering field, has receiving coils that are arranged in outer region of winding body | |
EP3824323B1 (en) | Detector for detecting electrically conductive material | |
EP1685365A2 (en) | Contactless displacement measuring system | |
DE102007010467B4 (en) | Inductive proximity switch | |
DE102007041522B4 (en) | Capacitive position sensor | |
DE3242621A1 (en) | Capacitive proximity detector | |
DE102014207482B4 (en) | Inductive proximity switch | |
DE102012015200A1 (en) | Inductive proximity switch for detecting metallic targets in monitoring area, comprises transmitter coil that is cylindrical coil and receiving coil that is sheet-shaped coil, whose coil surface runs parallel to surface of transmitter coil | |
DE102015213391A1 (en) | Inductive proximity switch | |
DE102004032258B4 (en) | Inductive proximity sensor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
R012 | Request for examination validly filed | ||
R016 | Response to examination communication | ||
R018 | Grant decision by examination section/examining division | ||
R020 | Patent grant now final | ||
R020 | Patent grant now final |
Effective date: 20150106 |