EP1516160A2 - Bobine de detection et capteur de mesure de deplacement - Google Patents

Bobine de detection et capteur de mesure de deplacement

Info

Publication number
EP1516160A2
EP1516160A2 EP03720266A EP03720266A EP1516160A2 EP 1516160 A2 EP1516160 A2 EP 1516160A2 EP 03720266 A EP03720266 A EP 03720266A EP 03720266 A EP03720266 A EP 03720266A EP 1516160 A2 EP1516160 A2 EP 1516160A2
Authority
EP
European Patent Office
Prior art keywords
sensor coil
winding sections
sensor
coil according
sections
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Withdrawn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
EP03720266A
Other languages
German (de)
English (en)
Inventor
Markus Weber
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
Priority claimed from DE10253107.2A external-priority patent/DE10253107B4/de
Application filed by Micro Epsilon Messtechnik GmbH and Co KG filed Critical Micro Epsilon Messtechnik GmbH and Co KG
Publication of EP1516160A2 publication Critical patent/EP1516160A2/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Withdrawn legal-status Critical Current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
    • G01D5/22—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 differentially influencing two coils
    • 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

Definitions

  • the present invention relates to a sensor coil, in particular for a contactless, inductive displacement sensor, with two inner, essentially identical winding sections, a non-wound section being provided between the two inner winding sections.
  • a winding section in the sense of the present invention means that a corresponding number of turns of a coil wire are wound over a certain section of the sensor coil. Specifically, it could, for example, be a winding chamber that can be pushed onto a coil former in a modular manner.
  • the two winding sections are developed within the scope of the present invention in such a way that they are surrounded by other components, so that for the sake of simplicity the two winding sections are already referred to as inner winding sections at this point.
  • the present invention relates to a displacement measuring sensor which has a sensor coil.
  • displacement sensors or displacement measuring systems are required for shorter displacement measurements, for example the relative position of a moving system component to a stationary system is to be determined.
  • a typical order of magnitude for such measuring ranges is 50 mm and smaller.
  • An essential requirement on the part of industry is that the displacement sensor should be as compact as possible for a given measuring range, since in many cases the available installation space is very limited. It is precisely this requirement that the sensors currently available on the market, which are generally used for shorter displacement measurements, such as differential chokes or differential transformers, often cannot adequately meet these requirements.
  • the overall length is approximately 2.5 times the measuring path.
  • Non-contact, inductive displacement sensors based on a measuring coil fed with alternating current and an associated electrically and / or magnetically conductive measuring object, are used very frequently in displacement measuring technology.
  • Corresponding sensors are offered on the market, in which different methods are used.
  • Symmetrical systems with favorable properties, such as temperature behavior that is relatively easy to compensate, have proven to be very advantageous.
  • a disadvantage of these so-called differential systems is the unfavorable ratio of the measuring range to the overall length of the sensor, which means that the overall length of the sensor is generally several times larger than the measuring range.
  • systems that require little connecting lines are desirable in order to keep the wiring as simple as possible.
  • a solution is therefore desirable in which the advantages of symmetrical inductive systems are fully exploited and which also meets the following requirements:
  • DE 41 28 159 A1 discloses a generic sensor coil in the form of a measuring device for the contactless determination of the path or the angle of rotation of a component.
  • This sensor coil comprises two winding sections, the wire windings of which are wound in one layer in the course of the longitudinal axis of the coil from the inside to the outside with a decreasing distance - inhomogeneous.
  • the wire windings designed in this way can be used to obtain a measurement signal with the measurement device known from DE 41 28 159 A1, which has a linear calibration characteristic over the entire measurement range. With this sensor coil, the ratio of overall length to measuring range is quite favorable.
  • the present invention is therefore based on the object of specifying and developing a sensor coil of the generic type which can be produced using simple and economically feasible production methods and which nevertheless has the advantageous properties of the generic sensor coil.
  • the sensor coil of the generic type according to the invention achieves the above object by the features of claim 1.
  • a sensor coil is characterized in that two outer, essentially identical winding sections are provided, each on the side of the two inner ones facing away from the non-wound section Winding sections are arranged and that the two outer winding sections have a larger number of windings than the two inner winding sections.
  • the two outer winding sections can also have a homogeneous winding, so that conventional winding techniques can be used in a particularly advantageous manner, in which winding is wound next to winding, and thus simple winding machines can be used to produce the sensor coil according to the invention.
  • a larger number of winding layers can be generated in the respective winding sections in a further advantageous manner, as a result of which the impedance of the sensor coil resulting therefrom can be chosen to be correspondingly high.
  • a hollow signal sensitivity and a high signal transmission behavior of the sensor coil can be achieved in a particularly advantageous manner.
  • the sensor coil according to the invention can also be produced in small quantities without making large investments in complex production methods, it being economically interesting to produce differently configured sensor coils with different properties, each in small and medium quantities.
  • the outer winding sections serve, among other things, to focus or to increase the electromagnetic field of the sensor coil according to the invention in its outer end region.
  • the width of the outer winding sections in the direction of a longitudinal axis of the sensor coil is in each case shorter than the width of the inner winding sections.
  • the winding sections each have a uniform wire winding. It can be a conventional coil winding, which is wound side by side and layer by layer.
  • conventional winding machines can be used to produce the sensor coil according to the invention, which advantageously significantly reduces the manufacturing costs of the sensor coils.
  • the characteristic of the sensor coil according to the invention can also be influenced in that a non-wound, essentially identical section is provided between the inner and the outer winding sections.
  • the width of these two non-wound sections can be dimensioned such that they not only serve to delimit the inner and outer winding sections, but can also be made wider.
  • the properties of the sensor coil according to the invention can be determined by their characteristic sizes. These include in particular the width of the non-wound area, the width of the inner winding sections, the number of windings of the inner winding sections, the width of the outer winding sections, the number of turns of the outer winding sections and / or the width of the non-wound areas provided between the inner and outer winding sections ,
  • the cross-sectional area of the sensor coil and an optionally provided coil core of a certain permeability are also characteristic quantities of the sensor coil.
  • the ratio of the number of windings of the outer winding sections to the number of turns of the inner winding sections is a variable that can be varied for the conception of a sensor coil for a specific application while the coil geometry is otherwise the same. Consequently, sensor coils according to the invention which have been appropriately designed for a wide variety of applications can advantageously also be provided in small quantities.
  • the wire windings of the four winding sections are connected to one another. This could be achieved, for example, by using one and the same wire, which can be correspondingly wound sequentially on the coil in the four winding sections using a winding machine.
  • the sensor coil according to the invention could be operated with a wiring of the wire windings of the winding sections corresponding to a half-bridge circuit.
  • the sensor coil operated with a half-bridge circuit could advantageously be operated with a circuit customary for a differential choke.
  • the wire windings of the four winding sections could be wound continuously with one and the same wire, the two outer wire ends of the sensor coil wound in this way being used for the electrical connection.
  • the sensor coil according to the invention could have three electrical connections of the wire windings of the winding sections which lead to the outside. Two of the electrical connections are provided to supply the sensor coil. The third electrical connection is provided for tapping an output signal from the sensor coil, this connection being able to be provided in the intermediate, non-wound section when the two inner winding sections are wired.
  • the two outer wire ends could also be routed into the inner unwinded section, so that the electrical connections led to the outside are arranged overall in the unwinded area. This advantageously allows simple wiring of the sensor coil according to the invention with a corresponding electronic circuit.
  • the coil former could be linear, arcuate or circular.
  • the coil former could be axially symmetrical with respect to its longitudinal axis, for example in the form of a cylinder or hollow cylinder or in a square or polygonal cross-sectional area.
  • the winding sections coaxially with a longitudinal axis of the coil body.
  • the likewise cylindrical winding sections could be arranged coaxially with the cylinder axis of the coil body.
  • a displacement sensor having a sensor coil according to the invention can in principle be designed in two different embodiments.
  • the measurement object interacting with the sensor coil according to the invention could be arranged to be movable inside or outside the sensor coil, the measurement object being able to be assigned to a moving system component and the sensor coil to a stationary system.
  • the sensor coil is hollow and a measurement object is arranged to be movable inside the sensor coil along the direction of the longitudinal axis of the sensor coil.
  • the displacement sensor requires very little space in the radial direction and the measurement object is protected by the coil body.
  • a measurement object could be designed such that it at least the sensor coil sectionally encloses, the measurement object being movable along the direction of the longitudinal axis of the sensor coil.
  • a ring-shaped measurement object is conceivable that encloses the sensor coil.
  • the present sensor coil according to the invention could now work on the one hand according to the eddy current principle.
  • the measurement object would have to be designed in such a way that it has an electrically conductive material. If a high-frequency alternating current flows through the sensor coil, an alternating magnetic field arises at the sensor coil, which induces eddy currents in the electrically conductive material of the measurement object. Due to the eddy currents induced in the measurement object, the alternating current resistance of the sensor coil is varied depending on the relative position of the measurement object to the sensor coil by a corresponding change in the inductance of the sensor coil, which can be used to generate a measurement signal.
  • the sensor coil according to the invention could be operated using an inductive measuring method.
  • the measurement object has magnetic material.
  • the inductive measuring method the inductance of the sensor coil is varied depending on the magnetic properties of the measurement object and the relative position of the measurement object to the sensor coil.
  • a combination of both measurement methods is also conceivable, namely if the measurement object has both electrically conductive material and magnetic material.
  • a displacement measuring sensor can be designed in such a way that it has a sensor coil according to the invention according to one of claims 1 to 18.
  • Such a position measuring sensor will usually include, in addition to the sensor coil, a measurement object and a corresponding electronic control for supplying and tapping the output signal of the sensor coil.
  • the advantages of the sensor coil according to the invention present here are to be listed again.
  • the sensor coil according to the invention is particularly suitable for small sensor measuring ranges in which the ratio of the length of the coil winding to the diameter of the coil winding is usually less than ten.
  • the sensor coil has the full advantages of an inductive differential system. Only three connecting lines are required. For displacement sensors with measuring ranges of less than 50 mm, a very good ratio of the measuring range of the displacement sensor to the overall length of the displacement sensor can be achieved, for example below 1, 5. In the case of sensor coils with a larger coil diameter, this also applies to larger measuring ranges.
  • the non-wound section in the middle of the sensor coil can be used to make contact with the connecting wires, thereby further saving space and achieving a symmetrical construction of the displacement sensor.
  • the displacement sensor having very good technical data, such as linearity and temperature behavior.
  • the displacement sensor can be operated with the circuit technology of a differential choke.
  • the compact size of the sensor coil, a simple winding concept and a very simple electrical interface reveal the economic advantages of the sensor coil according to the invention and the displacement sensor, for applications with small, medium and large quantities.
  • FIG. 1 A schematic representation of an embodiment of a sensor coil according to the invention.
  • FIG. Shows a sensor coil with two inner, essentially identical winding sections 1, which are designed in the form of winding chambers.
  • a non-wound section 2 is provided between the two inner winding sections 1.
  • two outer, essentially identical winding sections 3 are provided, which are each arranged on the side of the two inner winding sections 1 facing away from the non-wound section 2.
  • the two outer winding sections 3 have a larger number of windings than the two inner winding sections 1.
  • the sensor coil according to the invention is thus constructed symmetrically, namely symmetrically with respect to the non-wound section 2.
  • the width of the outer winding sections 3 in the direction of the longitudinal axis 4 of the sensor coil shown in dashed lines is in each case shorter than the width of the inner winding sections 1. Since the outer winding sections 3 have a higher number of windings than the inner winding sections 1, the radial extent of the outer winding section 3 indicated in the single FIG. Is greater than that of the inner winding section 1.
  • the four winding sections 1, 2 are wound with a single wire. This wire runs from the right electrical connection 6 to the right outer winding section 3, from there - after a corresponding winding - to the right inner winding section 1, then - also after a corresponding winding the unwinded area 2 to the left inner winding section 1, then to the left outer winding section 3 and finally to the left electrical connection 6.
  • the sensor coil can be connected to the three electrical connections 6, 7 with a half-bridge circuit.
  • the three electrical connections 6, 7 leading to the outside of the wire winding of the four winding sections 1, 3 are provided.
  • the two electrical connections 6 are used to feed the sensor coil and the third electrical connection 7 is used to tap an output signal.
  • the three external electrical connections 6, 7 are arranged in the non-wound area 2.
  • the bobbin 8 of the sensor coil according to the invention is symmetrical, namely rotationally symmetrical with respect to its longitudinal axis 4.
  • the bobbin 8 extends from the right and left ends of the sensor coil. For the sake of simplicity, only the end regions of the bobbin 8 are shown.
  • the winding sections 1, 3 are arranged coaxially with the longitudinal axis 4 of the bobbin 8.
  • the optimal design of the sensor is carried out by adapting the ratio "(number of windings of the outer winding sections 3) / (number of windings of the inner winding sections 1)" in conjunction with the selection of the suitable width of the unwinded section 2 and in coordination with Due to the described adaptation, the electromagnetic field inside the coil is bundled over the entire length, so that practically the entire length of the sensor coil is available as a measuring range.
  • the main feature of the displacement sensors according to the invention with a very favorable "length / measuring range” ratio is achieved by the coil concept.
  • the two symmetrically constructed winding sections are divided by two relatively short winding sections. This creates a system that has four Another difference is that between see the two inner winding sections 1, a non-wound section 2 is present.

Landscapes

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

Abstract

L'invention concerne une bobine de détection, en particulier pour un capteur inductif de mesure de déplacement sans contact, laquelle bobine comprend deux sections d'enroulement intérieures (1) sensiblement identiques, entre lesquelles se trouve une section non enroulée (2). Cette bobine de détection, qui peut être fabriquée selon des procédés de fabrication simples et économiques, présente toutefois les propriétés positives des bobines de détection génériques. Ladite bobine se caractérise en ce que deux sections d'enroulement extérieures (3), sensiblement identiques, sont chacune placées sur le côté des deux sections d'enroulement intérieures (1) qui fait face à la section non enroulée (2) et ces deux sections d'enroulement extérieures (3) présentent un nombre d'enroulements supérieur à celui des deux sections d'enroulement intérieures (1).
EP03720266A 2002-06-26 2003-04-10 Bobine de detection et capteur de mesure de deplacement Withdrawn EP1516160A2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10228596 2002-06-26
DE10228596 2002-06-26
DE10253107.2A DE10253107B4 (de) 2002-06-26 2002-11-13 Sensorspule und Wegmesssensor
DE10253107 2002-11-13
PCT/DE2003/001201 WO2004003479A2 (fr) 2002-06-26 2003-04-10 Bobine de detection et capteur de mesure de deplacement

Publications (1)

Publication Number Publication Date
EP1516160A2 true EP1516160A2 (fr) 2005-03-23

Family

ID=30001476

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03720266A Withdrawn EP1516160A2 (fr) 2002-06-26 2003-04-10 Bobine de detection et capteur de mesure de deplacement

Country Status (4)

Country Link
US (1) US7157902B2 (fr)
EP (1) EP1516160A2 (fr)
JP (1) JP4387300B2 (fr)
WO (1) WO2004003479A2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7140257B2 (en) 2002-12-10 2006-11-28 Ashcroft Inc. Wireless transmitting pressure measurement device
US7165461B2 (en) * 2003-03-27 2007-01-23 Ashcroft, Inc. Pressure gauge having dual function movement plate
WO2004094971A1 (fr) 2003-03-27 2004-11-04 Dresser, Inc. Dispositif thermometrique
KR101291577B1 (ko) * 2011-11-23 2013-08-16 (주)대주기계 등속운동용 자기 베어링 시스템
JP6458742B2 (ja) * 2016-01-20 2019-01-30 オムロン株式会社 近接センサ
KR102127957B1 (ko) * 2017-07-28 2020-06-29 김규만 그래픽 태블릿

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1465476A (fr) * 1965-10-26 1967-01-13 M E C I Materiel Electr De Con Dispositif convertisseur de mesure produisant une tension électrique proportionnelle à un déplacement et ses applications
CH575115A5 (en) * 1974-02-06 1976-04-30 Sulzer Ag Signal source for denoting position of valve - uses longitudinal coil and axially movable ferromagnetic core for signal generation
JPS6013405U (ja) * 1983-07-05 1985-01-29 株式会社　東京衡機製造所 アクチユエ−タ
DE4128159A1 (de) * 1991-08-24 1993-02-25 Bosch Gmbh Robert Messeinrichtung zur beruehrungsfreien bestimmung des wegs oder des drehwinkels eines bauteils
JP2001272201A (ja) * 2000-03-27 2001-10-05 Sony Precision Technology Inc 位置検出装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004003479A3 *

Also Published As

Publication number Publication date
WO2004003479A2 (fr) 2004-01-08
WO2004003479A8 (fr) 2004-12-02
WO2004003479A3 (fr) 2004-04-29
US20050104578A1 (en) 2005-05-19
US7157902B2 (en) 2007-01-02
JP4387300B2 (ja) 2009-12-16
JP2005531004A (ja) 2005-10-13

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