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EP0925593A1 - Dispositif pour le reglage d'un potentiel electrique determine sur un noyau de ferrite d'un composant inductif et/ou pour la reduction d'un amortissement du composant inductif par les pertes induites par son champ magnetique - Google Patents

Dispositif pour le reglage d'un potentiel electrique determine sur un noyau de ferrite d'un composant inductif et/ou pour la reduction d'un amortissement du composant inductif par les pertes induites par son champ magnetique

Info

Publication number
EP0925593A1
EP0925593A1 EP97943744A EP97943744A EP0925593A1 EP 0925593 A1 EP0925593 A1 EP 0925593A1 EP 97943744 A EP97943744 A EP 97943744A EP 97943744 A EP97943744 A EP 97943744A EP 0925593 A1 EP0925593 A1 EP 0925593A1
Authority
EP
European Patent Office
Prior art keywords
inductive component
ferrite core
magnetic field
metal layer
electric potential
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Withdrawn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
EP97943744A
Other languages
German (de)
English (en)
Inventor
Tristan Werner
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.)
TDK Electronics AG
Original Assignee
Siemens Matsushita Components GmbH and Co KG
Epcos AG
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 Siemens Matsushita Components GmbH and Co KG, Epcos AG filed Critical Siemens Matsushita Components GmbH and Co KG
Publication of EP0925593A1 publication Critical patent/EP0925593A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type
    • H01F17/04—Fixed inductances of the signal type with magnetic core
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/125—Deflectable by temperature change [e.g., thermostat element]
    • Y10T428/12507—More than two components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/125—Deflectable by temperature change [e.g., thermostat element]
    • Y10T428/12514—One component Cu-based
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12951—Fe-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/32—Composite [nonstructural laminate] of inorganic material having metal-compound-containing layer and having defined magnetic layer
    • Y10T428/325—Magnetic layer next to second metal compound-containing layer

Definitions

  • the present invention relates to a device for setting a defined electrical potential on a ferrite core of an inductive component and / or for reducing an attenuation of the inductive component by losses induced by its magnetic field according to the preamble of patent claim 1.
  • inductive proximity switches or sensors contain, as an active element, an inductive system consisting of an electrical winding and a ferrite core which is designed as a shell core.
  • the magnetic field generated by the electrical current flowing in the winding is guided and directed by the shell core in such a way that it emerges from the core on only one side. Is near this side, i.e. H. an object made of electrically or magnetically conductive material in the active surface of the proximity switch, the magnetic field is deformed.
  • An electrical switching signal of the proximity switch is derived from this deformation or influence.
  • the ferrite core is at a defined electrical potential. Because ferrites are bad electrical Having conductivity (which is desirable from the point of view of losses in the core), conventional methods for potential definition, for example the soldering of electrical conductors, are out of the question.
  • Scattering of the contact resistance from ferrite to the conductor is relatively large. There may be a standard deviation of 1.8 kOhm.
  • inductive proximity switches Another problem with inductive proximity switches occurs when a metal tube, in particular a stainless steel tube, is used as the housing.
  • the eddy currents induced in such a housing tube cause a pre-vaporization of the coil system of the proximity switch and thereby reduce the maximum switching distance.
  • a copper ring can be arranged between the coil system and the housing, as a result of which the eddy current losses are substantially reduced because the electrical conductivity of copper is orders of magnitude higher than that of the housing material that is usually used. This reduces the pre-damping of the coil system and, as a result, also increases the possible switching distance of the proximity switch.
  • inductive proximity switches reference is made to “Sensors in Automation Technology” by G. Schnell, Vieweg Verlag, Braunschweig 1991, pages 5 to 10.
  • the present invention is based on the object of specifying a possibility for setting the potential and / or reducing the attenuation of inductive components which does not have the aforementioned disadvantages.
  • FIG. 1 shows a first embodiment of a ferrite core with glued metal layer
  • FIG. 2 shows a further embodiment of a ferrite core with a metal foil glued on.
  • FIG. 1 schematically shows a ferrite core 1 with a central hole 2, as can be used for an inductance of an inductive proximity switch.
  • a metal layer 3 is glued onto this core 1 by means of an electrically conductive and temperature-resistant adhesive which adheres to the operating temperature range of the inductive component (not shown in FIG. 1 for reasons of clarity).
  • an adhesive with extremely high conductivity, high adhesion and temperature resistance is known per se and commercially available.
  • the metal layer 3 can be a circular copper plate of a given diameter. Of course, other shapes, for example rectangular shapes of different sizes, are also possible.
  • the measure according to the invention has the following advantages:
  • the metal layer adheres very well to the ferrite surface.
  • the contact resistance between the electrically conductive metal layer and the ferrite is relatively low.
  • Practical measurements of the contact resistance between a copper plate with a diameter of 6 mm and ferrite give a value of 3.67 kOhm compared to a value of 5.39 kOhm in the previously used method of pressing on a metal plate.
  • An electrical connection can be made by thermal methods, e.g. B. by soldering.
  • the spread of the contact resistance between ferrite and the metal layer surface is small.
  • Measurements of the contact resistance between a copper plate with a diameter of 6 mm and ferrite have shown a standard deviation of 0.56 kOhm compared to a value of 1.83 kOhm in the known method.
  • a metal foil 20 is glued onto the surface of the ferrite core 1 by means of an adhesive 21.
  • the problem of the above-described damping of the inductive system by eddy currents can thus be mastered well.
  • the adhesive 21 the metal foil 20 is practically applied directly to the surface of the ferrite core. This has the advantage that there are no tolerance problems as in the known measure of using a metal ring.
  • very thin layers can go down too some 10 ⁇ m can be applied. In practice, the thickness can e.g. B. 0.01 to 0.1 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Non-Reversible Transmitting Devices (AREA)

Abstract

Pour le réglage d'un potentiel électrique déterminé sur un noyau de ferrite (1) d'un composant inductif et/ou pour la réduction d'un amortissement du composant inductif par les pertes induites par son champ magnétique, il est prévu de coller une couche métallique (20) sur le noyau de ferrite (1).
EP97943744A 1996-09-10 1997-09-08 Dispositif pour le reglage d'un potentiel electrique determine sur un noyau de ferrite d'un composant inductif et/ou pour la reduction d'un amortissement du composant inductif par les pertes induites par son champ magnetique Withdrawn EP0925593A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19636742 1996-09-10
DE19636742A DE19636742C2 (de) 1996-09-10 1996-09-10 Einrichtung zur Einstellung eines definierten elektrischen Potentials auf einem Ferritkern eines induktiven Bauelementes und/oder zur Verringerung einer Bedämpfung des induktiven Bauelementes durch von dessen Magnetfeld induzierte Wirbelströme
PCT/DE1997/001993 WO1998011569A1 (fr) 1996-09-10 1997-09-08 Dispositif pour le reglage d'un potentiel electrique determine sur un noyau de ferrite d'un composant inductif et/ou pour la reduction d'un amortissement du composant inductif par les pertes induites par son champ magnetique

Publications (1)

Publication Number Publication Date
EP0925593A1 true EP0925593A1 (fr) 1999-06-30

Family

ID=7805152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97943744A Withdrawn EP0925593A1 (fr) 1996-09-10 1997-09-08 Dispositif pour le reglage d'un potentiel electrique determine sur un noyau de ferrite d'un composant inductif et/ou pour la reduction d'un amortissement du composant inductif par les pertes induites par son champ magnetique

Country Status (6)

Country Link
US (1) US6746785B1 (fr)
EP (1) EP0925593A1 (fr)
JP (1) JP2001509954A (fr)
DE (1) DE19636742C2 (fr)
TW (1) TW346633B (fr)
WO (1) WO1998011569A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19816058B4 (de) * 1998-02-16 2009-02-05 Ifm Electronic Gmbh Sensorbauteil eines induktiven Näherungsschalters
CN102306535A (zh) * 2011-05-20 2012-01-04 张家港市众力磁业有限公司 一种抗电磁干扰用铁氧体磁心
DE102012202825B4 (de) 2012-02-24 2019-03-28 Ifm Electronic Gmbh Induktiver Näherungsschalter
DE102012102806A1 (de) 2012-03-30 2013-10-02 Balluff Gmbh Elektrisches Gerät und Verfahren zur Herstellung einer Spuleneinrichtung
EP2741419B1 (fr) 2012-12-10 2015-01-21 ifm electronic gmbh Détecteur de proximité inductif
WO2020056025A1 (fr) * 2018-09-12 2020-03-19 California Institute Of Technology Capteur d'amortissement inductif portable
US11890097B2 (en) 2020-02-19 2024-02-06 California Institute Of Technology Inductive damping brain sensor
WO2024182066A1 (fr) 2023-03-01 2024-09-06 StrokeDx, Inc. Système de positionnement de bobine pour capteur cérébral non invasif

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH558073A (de) * 1972-03-17 1975-01-15 Siemens Ag Drosselspule.
FR2346679A1 (fr) * 1976-04-02 1977-10-28 Itt Produits Ind Detecteur de proximite electromagnetique
US4127110A (en) * 1976-05-24 1978-11-28 Huntington Institute Of Applied Medical Research Implantable pressure transducer
JPS61170010A (ja) * 1985-01-24 1986-07-31 Toshiba Corp 変圧器鉄心
DE8810709U1 (de) * 1988-08-24 1988-10-13 C.Y. Chiang, Tao Yuan Drossel zur Befestigung auf einer Fläche
US5182427A (en) * 1990-09-20 1993-01-26 Metcal, Inc. Self-regulating heater utilizing ferrite-type body
US5191618A (en) * 1990-12-20 1993-03-02 Hisey Bradner L Rotary low-frequency sound reproducing apparatus and method
US5153540A (en) * 1991-04-01 1992-10-06 Amphenol Corporation Capacitor array utilizing a substrate and discoidal capacitors
US5312674A (en) * 1992-07-31 1994-05-17 Hughes Aircraft Company Low-temperature-cofired-ceramic (LTCC) tape structures including cofired ferromagnetic elements, drop-in components and multi-layer transformer
US5653841A (en) * 1995-04-13 1997-08-05 Martin Marietta Corporation Fabrication of compact magnetic circulator components in microwave packages using high density interconnections
US5650759A (en) * 1995-11-09 1997-07-22 Hittman Materials & Medical Components, Inc. Filtered feedthrough assembly having a mounted chip capacitor for medical implantable devices and method of manufacture therefor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9811569A1 *

Also Published As

Publication number Publication date
DE19636742C2 (de) 1999-05-12
JP2001509954A (ja) 2001-07-24
DE19636742A1 (de) 1998-03-12
TW346633B (en) 1998-12-01
US6746785B1 (en) 2004-06-08
WO1998011569A1 (fr) 1998-03-19

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