EP1685365A2 - Systeme de mesure de deplacement fonctionnant sans contact - Google Patents

Systeme de mesure de deplacement fonctionnant sans contact

Info

Publication number
EP1685365A2
EP1685365A2 EP04790056A EP04790056A EP1685365A2 EP 1685365 A2 EP1685365 A2 EP 1685365A2 EP 04790056 A EP04790056 A EP 04790056A EP 04790056 A EP04790056 A EP 04790056A EP 1685365 A2 EP1685365 A2 EP 1685365A2
Authority
EP
European Patent Office
Prior art keywords
measuring system
coil
measurement object
position measuring
tube
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Withdrawn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
EP04790056A
Other languages
German (de)
English (en)
Inventor
Felix Mednikov
Martin Sellen
Eduard Huber
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.)
Micro Epsilon Messtechnik GmbH and Co KG
Original Assignee
Micro Epsilon Messtechnik GmbH and Co KG
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 Micro Epsilon Messtechnik GmbH and Co KG filed Critical Micro Epsilon Messtechnik GmbH and Co KG
Publication of EP1685365A2 publication Critical patent/EP1685365A2/fr
Withdrawn legal-status Critical Current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
    • G01D5/2006—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 self-induction of one or more coils
    • G01D5/2013—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 self-induction of one or more coils by a movable ferromagnetic element, e.g. a core
    • 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
    • G01D5/2006—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 self-induction of one or more coils
    • G01D5/202—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 self-induction of one or more coils by movable a non-ferromagnetic conductive element
    • 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
    • G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
    • G01D2205/70—Position sensors comprising a moving target with particular shapes, e.g. of soft magnetic targets
    • G01D2205/77—Specific profiles
    • G01D2205/774—Profiles with a discontinuity, e.g. edge or stepped profile

Definitions

  • the invention relates to a non-contact displacement measuring system with a sensor having a measuring coil to which alternating current can be applied, the measuring coil having at least two voltage taps, with an electrically and / or magnetically conductive measuring object associated with the sensor and with an evaluation circuit, the sensor and the measuring object in Longitudinal direction of the measuring coil are displaceable relative to one another.
  • Non-contact displacement measuring systems have been known in practice in various embodiments for years.
  • non-contact displacement measuring systems with a sensor having at least one coil are known, that is to say displacement measuring systems which operate either on an eddy current basis or inductively.
  • Known arrangements for inductive displacement measurement work for example, according to the LVDT principle (linear variable differential transformer) and comprise a primary and two secondary coils, the primary coils being supplied with an alternating current of constant frequency by an oscillator electronics.
  • a ferromagnetic core is guided without contact between the coils encapsulated in a housing.
  • alternating voltages are induced in the two secondary coils.
  • a shift in the magnetic core causes a higher voltage in one secondary coil and a lower voltage in the other secondary coil, the difference between the two secondary voltages being proportional to the core shift.
  • the problem here is that the actual measurement object, the movement of which is to be detected, must be mechanically connected to the magnetic core so that it records the measurement movements.
  • the connection can, for example, be welded or realized using a thread. Both variants are extremely complex mechanically.
  • An eddy current sensor is known from DE 42 25 968 A1, in which a measuring coil with several voltage taps is also already provided.
  • a ring encompassing the coil housing at a distance, depending on the position of the ring, is used to determine the partial impedance of the measuring coil between two taps affected.
  • the position of the ring with respect to the voltage taps can therefore be determined with the aid of an evaluation circuit.
  • the measurement object actually to be detected has to be connected to the ring in a mechanically complex manner.
  • the present invention is based on the object of designing and developing a non-contact displacement measuring system of the type mentioned at the outset in such a way that the measurement object can be defined as a simple mechanical part.
  • the distance measuring system in question is designed in such a way that the measurement object has at least one marking influencing the impedance of the measuring coil between two voltage taps, so that the evaluation circuit supplies an output signal which correlates with the position of the measurement object with respect to the voltage taps.
  • the measurement object can interact with the measurement coil directly - with appropriate positioning relative to the measurement coil - on the basis of the marking provided on the measurement object, so that an output signal correlating with the position of the measurement object in relation to the voltage taps is provided.
  • the marking could be an air gap, since this could be generated particularly easily, for example by milling or by drilling, on the measurement object.
  • the measurement object would only be made from a single material, so that the manufacturing costs would be considerably reduced compared to known displacement measuring systems.
  • the measurement object is preferably designed as a tube with at least one air gap and arranged parallel to the axis of the measurement coil. In connection with an axially parallel displacement of the tube, the presence of the air gap in one of the sections of the measuring coil defined by the voltage taps influences the partial impedance of the corresponding coil section, which leads to corresponding output signals which are provided by the evaluation circuit.
  • the air gap could have a maximum width corresponding to the distance between two adjacent voltage taps, so that the air gap between two voltage taps can always be clearly located.
  • the length of the tube could correspond approximately to the length of the measuring coil.
  • the sensor would be used optimally. The measuring range would then be maximum and would correspond to the length of the measuring coil.
  • the tube could have two air gaps located opposite one another.
  • the tube could also have three air gaps which are offset from one another at 120 °, in principle any configuration of the air gap / the air gaps is conceivable.
  • a limit with regard to the specific design is basically only given by the necessary mechanical strength of the tube.
  • the measurement object could be made of a ferromagnetic material, for example iron.
  • the partial impedance of the measuring coil would be reduced in the section in which the air gap is located, so that a lower voltage would be tapped between the corresponding voltage taps than between the other voltage taps.
  • the measurement object could also be made from a non-ferromagnetic material, in particular from aluminum. The presence of the air gap in a certain section of the measuring coil would then result in an increase in the corresponding partial impedance and consequently in an increase in the corresponding voltage value.
  • the wall thickness of the tube could be chosen such that it is greater than the depth of penetration of the eddy current.
  • the measuring object could be displaceable inside the measuring coil.
  • the measurement object is also designed as a tube, there is the very special advantage that the interior of the tube can be used for other functions at the same time.
  • the inside of the tube could be used, for example, for power transmission, for example by passing a shaft or a rope through the tube. It would also be conceivable to use the inside of the tube as an optical beam path or for cooling.
  • the measurement object could be displaceable outside the sensor in such a way that the measurement object encloses the measurement coil.
  • the measuring coil could be made in single-layer or multi-layer technology and wound around a coil body.
  • a plastic bobbin is particularly useful.
  • the coil body could be designed in the form of a plastic rod, which is particularly advantageous if the measurement object is arranged outside the sensor.
  • the coil former from an electrically conductive material with a high specific electrical resistance, with non-magnetic, stainless steel being particularly suitable here.
  • the wall thickness of the coil former could be selected such that the depth of the electromagnetic alternating field is less than the wall thickness of the coil former. pers. This effect could also be achieved by appropriate selection of the frequency of the AC voltage applied to the measuring coil.
  • the coil body and the measuring coil could be encapsulated in a housing.
  • the housing can be made, for example, of plastic or another non-ferromagnetic material, in particular a stainless steel.
  • a compact, encapsulated sensor could be produced in this way, particularly in connection with a measurement object guided within the coil former.
  • the signals provided via the voltage taps and fed to the evaluation circuit could be provided in a particularly simple manner by the evaluation circuit as an output voltage that varies linearly with the position of the air gap or the measurement object.
  • a possible evaluation circuit is disclosed in detail, for example, in DE 42 25 968 A1.
  • the voltage taps could be interleaved with one another.
  • FIG. 1 is a schematic representation of a first embodiment of a displacement measuring system according to the invention
  • Fig. 2 shows a schematic representation of a second embodiment of a displacement measuring system according to the invention
  • FIG. 3 shows a schematic representation of a tubular measurement object with an air gap.
  • 1 shows a first exemplary embodiment of a non-contact displacement measuring system according to the invention with a sensor 2 having a measuring coil 1 which can be acted upon by alternating current, a supply / evaluation circuit 3 connected to the sensor 2 and an electrically and / or magnetically conductive sensor 2 assigned to the sensor Measuring object 4.
  • the measuring coil 1 is designed as a long coil, specifically as a cylindrical coil with uniform windings, and is wound on a coil former 5, the measuring coil 1 and the coil former 5 being encapsulated in a housing 6.
  • the measuring coil 1 is supplied with two complementary alternating voltages U 2 and U 2 via the supply / evaluation circuit 3.
  • the measuring coil 1 has two voltage taps 7, so that, depending on the number of voltage taps 7, voltage values can be tapped between the individual voltage taps 7 and fed to the supply evaluation circuit 3.
  • the measurement object 4 has a marking 8 which influences the impedance of the measurement coil 1 between two voltage taps 7, so that the evaluation circuit 3 supplies an output signal 9 which correlates with the position of the measurement object 4 in relation to the voltage taps 7.
  • the measurement object 4 which is guided without contact within the measurement coil 1 and is enclosed at a short distance from it, is designed as a tube 10.
  • the marking 8 is in the form of a radial air gap 11 milled into the tube 10.
  • FIG. 2 shows - schematically - a second exemplary embodiment of a displacement measuring system according to the invention, the same reference numerals referring to the same components as in FIG. 1.
  • the essential difference from the exemplary embodiment according to FIG. 1 is that the measurement object 4 is not guided without contact within the measurement coil 1, but rather that the measurement object 4 encloses the sensor 2 in a cylindrical manner with a small distance.
  • the measuring coil 1 is wound on a rod-shaped coil body 5.
  • the measuring coil 1 and the coil body 5 are encapsulated in a housing 6 made of plastic. Both the feeders to the supply the measuring coil 1 with the two complementary alternating voltages ⁇ J and U 2 as well as the voltage taps 7 are laid parallel to the rod-shaped coil body 5 from an end face of the sensor 2.
  • FIG. 3 schematically shows a measurement object 4 and a specific configuration of the air gap 11 in a side view (a) and a top view (b).
  • the air gap 11 is made up of three staggered from one another by 120 ° Material cutouts formed.
  • the three areas marked with a, which form three webs, in which the tube 10 has its full material thickness in the radial direction, are in principle only limited by the mechanical strength of the measurement object 4 which is necessary, depending on the specific application.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

La présente invention concerne un système de mesure de déplacement qui fonctionne sans contact et qui comprend un capteur (2) présentant une bobine de mesure (1) qui est alimentée avec un courant alternatif et qui présente au moins deux prises de tension (7), un objet de mesure (4) qui est électroconducteur et/ou magnétoconducteur et qui est associé au capteur (2), ainsi qu'un circuit d'évaluation (3). Le capteur (2) et l'objet de mesure (4) peuvent se déplacer l'un par rapport à l'autre dans la direction longitudinale de la bobine de mesure (1). Cette invention est caractérisée en ce que l'objet de mesure (4) présente un marquage (8) qui influence l'impédance de la bobine de mesure (1) entre deux prises de tension (7), de façon que le circuit d'évaluation (3) fournisse un signal de sortie (9) en corrélation avec la position de l'objet de mesure (4) par rapport à la prise de tension (7).
EP04790056A 2003-11-20 2004-10-28 Systeme de mesure de deplacement fonctionnant sans contact Withdrawn EP1685365A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10354375A DE10354375A1 (de) 2003-11-20 2003-11-20 Berührungslos arbeitendes Wegmesssystem
PCT/DE2004/002408 WO2005052506A2 (fr) 2003-11-20 2004-10-28 Systeme de mesure de deplacement fonctionnant sans contact

Publications (1)

Publication Number Publication Date
EP1685365A2 true EP1685365A2 (fr) 2006-08-02

Family

ID=34625165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04790056A Withdrawn EP1685365A2 (fr) 2003-11-20 2004-10-28 Systeme de mesure de deplacement fonctionnant sans contact

Country Status (5)

Country Link
US (1) US7602175B2 (fr)
EP (1) EP1685365A2 (fr)
CN (1) CN101341377B (fr)
DE (1) DE10354375A1 (fr)
WO (1) WO2005052506A2 (fr)

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US8253619B2 (en) 2005-02-15 2012-08-28 Techtronic Power Tools Technology Limited Electromagnetic scanning imager
DE102005040536A1 (de) * 2005-08-26 2007-03-29 Honeywell Technologies Sarl Verfahren und Vorrichtung zum Messen einer Kraft und einer Position
US20070296405A1 (en) * 2006-06-26 2007-12-27 Orbotech Ltd. Plotting an image on a thin material having variations in thickness
US20090058430A1 (en) * 2007-09-05 2009-03-05 Sentrinsic Systems and Methods for Sensing Positions of Components
CA2717860C (fr) 2008-03-07 2016-11-08 Milwaukee Electric Tool Corporation Boitier de batterie pour une utilisation avec un outil motorise et un outil de detection non motorise
US8193802B2 (en) 2008-04-09 2012-06-05 Milwaukee Electric Tool Corporation Slidably attachable non-contact voltage detector
US9664808B2 (en) 2009-03-06 2017-05-30 Milwaukee Electric Tool Corporation Wall scanner
US8692541B2 (en) * 2011-10-05 2014-04-08 David Scott Nyce Position sensing head with redundancy
KR102160324B1 (ko) 2013-02-01 2020-09-25 콘티넨탈 테베스 아게 운트 코. 오하게 감지 디바이스를 제조하기 위한 방법
DE102013203586A1 (de) * 2013-03-01 2014-09-04 Continental Teves Ag & Co. Ohg Sensor zum Erfassen einer Position eines Gebermagneten
CN106524978A (zh) * 2016-11-16 2017-03-22 上海核工程研究设计院 一种核电站的主设备支撑间隙测量系统

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JPH07332911A (ja) * 1994-06-03 1995-12-22 Sony Corp 軸位置検出用センサー
DE59710762D1 (de) * 1996-07-30 2003-10-23 Micro Epsilon Messtechnik Berührungslos arbeitender wegmessensor
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Also Published As

Publication number Publication date
US7602175B2 (en) 2009-10-13
DE10354375A1 (de) 2005-06-30
CN101341377A (zh) 2009-01-07
CN101341377B (zh) 2011-01-05
WO2005052506A3 (fr) 2008-12-11
US20060202682A1 (en) 2006-09-14
WO2005052506A2 (fr) 2005-06-09

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