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WO2012013721A2 - Capteur de déplacement électrique - Google Patents

Capteur de déplacement électrique Download PDF

Info

Publication number
WO2012013721A2
WO2012013721A2 PCT/EP2011/062938 EP2011062938W WO2012013721A2 WO 2012013721 A2 WO2012013721 A2 WO 2012013721A2 EP 2011062938 W EP2011062938 W EP 2011062938W WO 2012013721 A2 WO2012013721 A2 WO 2012013721A2
Authority
WO
WIPO (PCT)
Prior art keywords
coils
weggeberanordnung
coil
displacement
path
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.)
Ceased
Application number
PCT/EP2011/062938
Other languages
German (de)
English (en)
Other versions
WO2012013721A3 (fr
Inventor
Stefan Dilger
Adolf Heydel
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.)
Elektro Bauelemente GmbH
Original Assignee
Elektro Bauelemente 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
Priority claimed from DE102010032767A external-priority patent/DE102010032767A1/de
Priority claimed from DE102010042408A external-priority patent/DE102010042408A1/de
Priority claimed from DE201110077118 external-priority patent/DE102011077118A1/de
Application filed by Elektro Bauelemente GmbH filed Critical Elektro Bauelemente GmbH
Publication of WO2012013721A2 publication Critical patent/WO2012013721A2/fr
Publication of WO2012013721A3 publication Critical patent/WO2012013721A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/204—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils
    • G01D5/2046—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by a movable ferromagnetic element, e.g. a core

Definitions

  • Differential throttle arrangement is displaceable, and with one of the
  • the inductance of two coils is changed by means of an electrically conductive body, wherein the coils are arranged such that upon movement of the electrically conductive body increases the inductance of a coil and the other coil is reduced.
  • two coaxially arranged coils may be provided which cooperate with a movable in the longitudinal direction of the coil axes common anchor.
  • the two coils are in one
  • Bridge circuit arranged, which in turn is subjected to an AC voltage of sufficiently high frequency. Upon displacement of the armature then occur between the bridge arms on the displacement of the armature dependent voltage differences. Basically, it is also possible between the facing each other
  • Front ends of two equiaxed coils to arrange a movable in the direction of the coil axes electrically conductive or magnetic or magnetizable body, so that increases in movements of the body in the direction of the coil axis in each case the inductance of a coil and the other coil is reduced.
  • the differential throttle principle can also be realized with coils arranged parallel to one another, whose front ends are each arranged in a common plane. If an electrically conductive and / or magnetic or magnetizable body is moved transversely to the coil axes in front of the adjacent ends of the coils on a path passing through the coil axes, the inductance of one coil is increased and the other coil is reduced.
  • the object of the invention is, in a Weggeberan extract of the type specified a large measuring range at the same time very high
  • the invention is based on the general idea to form the winding shapes of the coils so that a shape feature in each of the two Changing directions on one coil in one way and on the other coil in opposite ways.
  • a particularly pronounced change in the electrical properties of the differential throttle arrangement is provoked, so that a path display with highest accuracy is made possible. Since it is readily possible, a shape feature along a large
  • Moving path to be arranged perpendicular coil axes and have a wedge-like cross section, wherein the longitudinal directions of the wedge cross-sections of the two coils are arranged antiparallel to each other and parallel to the displacement.
  • the slider when the slider is displaced, it overlaps an increasingly wider area of the winding cross-section in one coil, while in the other coil an increasingly narrowing region of the winding cross-section is overlapped.
  • the coil turns with the wedge cross sections can be arranged on a substrate, i. the coils are formed as flat coils.
  • Coil windings each have a strip-shaped cross section, wherein the
  • Strip length of the next following winding is larger (or smaller) dimensioned as in the previous winding.
  • Winding sections at one end of the strip arranged closely adjacent to each other, while the U-shaped winding sections at the other
  • Strip end according to the different strip lengths comparatively have large distances.
  • the "winding density" of the coils is comparatively small. If such coils having mutually parallel strip longitudinal axes are arranged next to one another, the slider overlaps regions with high or increasing winding density on its displacement path in one coil and regions with decreasing winding density on the other coil ,
  • Differential choke arrangement substantially two tubular coils with mutually parallel coil axes, wherein the coil windings of a coil in one direction increasing slope and the other coil in the other direction have an increasing slope, so that the "axial winding density" in the two coils in If now the slider is displaced on the two coils in the coil longitudinal direction, markedly opposite changes of the electrical properties of the coils of the differential throttle arrangement again result.
  • FIG. 1 is a schematic plan view of an inventive
  • Fig. 2 is a schematic circuit diagram of the Weggeberan note the
  • FIG. 3 shows diagrams of the circuit points A, B and C applied or tapped electrical voltages
  • FIG. 4 is a plan view of a comparison with FIG. 1 modified
  • Fig. 5 is a schematic plan view analogous to Fig. 1 to another
  • Fig. 6 is a schematic representation of a third embodiment.
  • conductor tracks in the form of two choke coils 1 and 2 are arranged on an electrically insulating substrate 10 which is not illustrated in more detail.
  • Each of the choke coils 1 and 2 has a pronounced wedge-shaped cross section, wherein the wedge tip of each one choke coil 1 or 2 is disposed adjacent to the wide end of the other wedge-shaped choke coil 2 or 1.
  • the windings of the choke coils 1 and 2 are electrically connected to one another at a connection point C, so that the choke coils 1 and 2 form an electrical series circuit which can be acted upon by a high-frequency voltage at connection points A and B in a manner shown below.
  • a substantially plate-shaped slide 3 is arranged closely above the substrate supporting the choke coils 1 and 2 and is shown dotted in FIG. 1 and can be displaced to the right or left in the arrow directions P from the illustrated central position.
  • the slider 3 is made of an electrically conductive material and may be formed in the form of a rectangular plate.
  • the slider 3 may also be formed as a double plate with a plate above and a plate below the reactor 1 and 2 supporting the substrate, wherein the two plates at the edges of the
  • Choke coils 1 and 2 supporting substrate can be electrically connected to each other.
  • the terminals A and B of the series connection formed by the choke coils 1 and 2 are connected to a high-frequency generator 4, which acts on the terminals A and B in each case with a high-frequency rectangular AC voltage.
  • the voltage applied to the connection B is high-frequency square-wave AC voltage with respect to the voltage applied to the connection point A square-wave AC voltage at the same frequency, z. Ex. 50 kHz, shifted by half a wavelength.
  • a pronounced pulse-shaped high-frequency alternating voltage can be tapped, whose frequency corresponds to the frequency of the applied at the connection points A and B high-frequency square-wave AC voltage.
  • the slider 3 assumes its center position, the positive and negative amplitudes of the AC voltage which can be tapped off at C have the same absolute values. Upon adjustment of the slider 3 from the middle position then results in greatly varying proportions.
  • Metrology is now provided in the invention, instead of the metrologically difficult to detect because of their size amplitudes of the pulses
  • this can be done by an input-side connected to C analog-to-digital converter, which receives 4 signals for detecting the start edges of the positive or negative pulses from the RF generator, the timing of the rectangular edges of the high-frequency rectangular AC voltage
  • the analog-to-digital converter determines the voltage values S v respectively with a predetermined time delay after the time signals of the RF generator 4 for the rectangular edges and forms the corresponding differences, the Possibility offered, one subject predetermined number of successively determined differences to averaging. For example, with a frequency of the RF generator of 50 kHz, 1000 temporally successive difference values can be used for averaging, nevertheless the mean values still follow one another at a frequency of 50 Hz, so that path changes of the slider 3 with a correspondingly high signal frequency (50 Hz) are detected.
  • the choke coils 1 and 2 can each also have a sickle-shaped arcuate shape and be arranged on a corresponding arcuate substrate. Now, if the slide 3 on a respect to the
  • Differenzialdrosselan extract of FIG. 1 it is also possible to arrange the Differenzialdrosselan extract of FIG. 1 on a curved surface, in particular a circular cylindrical surface, wherein the wedge tips in opposite to each other
  • the choke coils 1 and 2 on a flexible substrate, eg a flexible printed circuit board, which then (along with the coils 1 and 2) longitudinally rolled up and into an electrically non conductive tube is inserted. On this tube then a short piece of pipe made of electrically conductive material is slidably disposed. This pipe section corresponds functionally to the slide 3 of FIG. 1. Now, if the electrically conductive pipe piece combined with a float and electrically non-conductive pipe in a tank is arranged, the arrangement thus formed as
  • the choke coils 1, 2 are aligned with their wedge-shaped cross-section in the longitudinal direction of the tube or rod, i.
  • the wedge tip is vertically up or down aligned with vertical arrangement of the tube or rod.
  • the choke coils 1 and 2 as well as the associated carrier body can be designed as an injection-molded circuit carrier (molded interconnected device or MID).
  • MID injection-molded circuit carrier
  • Construction plastic in particular construction thermoplastic produced. Then, on this body by means of a laser, the pattern of
  • Plastic material is electrically conductive to the lines drawn by the laser. Then, a conductor track is generated by a galvanic process on the lines mentioned. As far as the circuit carrier thus produced in one
  • the interconnects are still covered with a protective layer or a protective varnish.
  • the circuit carrier produced in this way carries on its surface the wedge-shaped choke coils, which are opposed to each other
  • Vertexes of the choke coils in each case in the longitudinal direction of the circuit carrier can in turn be combined with a sliding on the circuit board electrically conductive slide or pipe piece, which in turn is combined with a float, so that the thus generated
  • Device can be used in turn as a level measuring device.
  • the differential choke arrangement according to the invention can be designed with two flat surfaces
  • each of the crescent-shaped choke coils extends over approximately a full circular arc.
  • Rotary positions such as a stepper motor, are used.
  • the choke coils 1 and 2 are each arranged as flat coils on a substrate 10. Although this is production-wise advantageous, but not absolutely mandatory. In principle, it is also possible to form the coils 1 and 2 with their wedge-shaped cross-section with windings arranged axially one behind the other, it being possible for the windings to be arranged on a winding support with the cross section corresponding to the wedge cross section.
  • the slider 3 is then displaceable transversely to the coil axes in front of the arranged in a plane front ends of the adjacent choke coils
  • the two coils 1 and 2 have a strip-shaped rectangular or
  • Strips end closely adjacent to each other, while the U-bends of the windings at the other end of the strip according to the
  • each tubular coils are provided, the windings on a tubular support body made of electrical
  • the slider 3 may be formed as a plate-shaped body, whose plate plane is parallel to a plane containing the coil axes. Instead, a coil surrounding both coils is possible, for example, with an oval cross-section.
  • the two coils electrically isolated from each other, are arranged concentrically to each other,
  • the slider 3 can be formed by a ring body comprising the two coils or by a body axially displaceable within the coil carrier.
  • the coils 1 and 2 are electrically connected according to FIG. 2 to the differential throttle arrangement shown there. This means at the same time that the coils seen from the circuit point C have an opposite sense of winding, so that the coils 1 and 2 at the circuit point C have an opposite magnetic polarity.
  • All embodiments can be produced with the above-described laser direct structuring on the respective coil shape adapted carriers, usually flat or tubular substrates.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

L'invention concerne un curseur électroconducteur, magnétique ou magnétisable qui coopère avec un système de bobines d'arrêt mode différentiel, dont les bobines présentent un paramètre d'enroulement géométrique qui varie au niveau des deux bobines, de manière inversement monotone, dans chaque direction de déplacement possible du curseur.
PCT/EP2011/062938 2010-07-29 2011-07-27 Capteur de déplacement électrique Ceased WO2012013721A2 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE102010032767.0 2010-07-29
DE102010032767A DE102010032767A1 (de) 2010-07-29 2010-07-29 Elektrische Weggeberanordnung
DE102010042408.0 2010-10-13
DE102010042408A DE102010042408A1 (de) 2010-07-29 2010-10-13 Elektrische Weggeberanordnung
DE102011077118.2 2011-06-07
DE201110077118 DE102011077118A1 (de) 2011-06-07 2011-06-07 Elektrische Weggeberanordnung

Publications (2)

Publication Number Publication Date
WO2012013721A2 true WO2012013721A2 (fr) 2012-02-02
WO2012013721A3 WO2012013721A3 (fr) 2012-03-22

Family

ID=44773033

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/062938 Ceased WO2012013721A2 (fr) 2010-07-29 2011-07-27 Capteur de déplacement électrique

Country Status (1)

Country Link
WO (1) WO2012013721A2 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4337208A1 (de) * 1993-10-30 1995-05-04 Siedle Horst Kg Induktiver Weggeber
WO1997014935A2 (fr) * 1995-10-17 1997-04-24 Scientific Generics Limited Codeur de position
DE10044839B4 (de) * 1999-09-27 2004-04-15 Siemens Ag Induktiver Positionssensor
WO2005019775A2 (fr) * 2003-08-20 2005-03-03 University Of Cape Town Detecteurs de position
JP2008170360A (ja) * 2007-01-15 2008-07-24 Shinko Denki Kk 変位センサ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Also Published As

Publication number Publication date
WO2012013721A3 (fr) 2012-03-22

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