DE10255710A1 - Inductive displacement sensor has electrical coil in detunable oscillating circuit, movable coil core in coil, coil body divided into at least two sections with different winding densities - Google Patents

Inductive displacement sensor has electrical coil in detunable oscillating circuit, movable coil core in coil, coil body divided into at least two sections with different winding densities Download PDF

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Publication number
DE10255710A1
DE10255710A1 DE2002155710 DE10255710A DE10255710A1 DE 10255710 A1 DE10255710 A1 DE 10255710A1 DE 2002155710 DE2002155710 DE 2002155710 DE 10255710 A DE10255710 A DE 10255710A DE 10255710 A1 DE10255710 A1 DE 10255710A1
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Germany
Prior art keywords
coil
sections
displacement sensor
inductive displacement
core
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Application number
DE2002155710
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German (de)
Inventor
Franz-Josef Bußmann
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.)
Hella GmbH and Co KGaA
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Hella KGaA Huek and Co
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Priority to DE2002155710 priority Critical patent/DE10255710A1/en
Publication of DE10255710A1 publication Critical patent/DE10255710A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
    • G01F23/72—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using magnetically actuated indicating means
    • 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
    • G01D5/243—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 phase or frequency of ac

Abstract

The inductive displacement sensor has an electrical coil connected in a detunable oscillating circuit and a movable coil core arranged in the coil. The coil body of the coil is divided into at least two sections and the winding densities in the sections are different. The coil body can have at least three sections or sectors (S1-S5) whose winding densities differ by a constant factor.

Description

Die Erfindung betrifft einen induktiven Wegsensor mit einer in einen verstimmbaren Schwingkreis geschalteten elektrischen Spule und einem in der Spule verschieblich angeordneten Spulenkern.The invention relates to an inductive displacement sensor with an electrical circuit switched into a detunable resonant circuit Coil and a coil core slidably arranged in the coil.

Das Funktionsprinzip eines solchen Wegsensors beruht darauf, daß die Induktivitätsänderung, die bei einer Verschiebung des Spulenkerns in der Spule entsteht zur Wegmessung ausgewertet wird.The principle of operation of such a displacement sensor is based on the fact that inductance, which arises when the coil core is displaced in the coil is evaluated for distance measurement.

Ein so aufgebauter Wegsensor weist jedoch prinzipbedingte Nachteile auf, die ihn für viele Anwendungen ausschließen. Die Spuleninduktivität ändert sich wesentlich nur beim Hinein- und Hinausschieben des Spulenkerns in den bewickelten Bereich des Spulenkörpers, so daß die Länge des Spulenkerns etwa der Länge des bewickelten Spulenkörpers entsprechen muß. Verschiebt man nämlich einen Spulenkern, der so kurz ausgeführt ist, daß sich dessen gesamte Länge vollständig innerhalb des bewickelten Bereiches des Spulenkörpers befinden kann, so führt die Verschiebung in diesem Bereich zu keiner Induktivitätsänderung und damit zu keiner auswertbaren Änderung des Meßsignals.A displacement sensor constructed in this way points however, there are inherent disadvantages that preclude it for many applications. The Coil inductance changes essentially only when pushing the spool core in and out the wound area of the bobbin so that the length of the Coil core about the length of the wound bobbin must correspond. You move it a coil core that is so short that its entire length is completely within of the wound area of the bobbin, so leads Shift in this area to no change in inductance and therefore no evaluable change in the measurement signal.

Nachteilig ist daher, daß die Länge des Spulenkerns mindestens die Hälfte der zu erfassenden Wegstrecke betragen muß. Weiterhin ist nachteilig, daß das Meßsignal bei Hineinschieben des Spulenkerns in den Spulenkörper ansteigt und beim Herausziehen des Spulenkerns wieder abfällt, so daß bei Ausnutzung des gesamten Stellweges der Wert des Meßsignals bezüglich der zu erfassenden Position mehrdeutig ist.It is therefore disadvantageous that the length of the At least half of the coil core the distance to be recorded must be. Another disadvantage is that the measurement signal increases when the coil core is pushed into the coil body and falls out when the coil core is pulled out, so that when the whole is used Travel the value of the measurement signal in terms of the position to be recorded is ambiguous.

Es ist die Aufgabe der Erfindung, einen induktiven Wegsensor zu schaffen, welcher die vorgenannten Nachteile vermeidet.It is the object of the invention to create an inductive displacement sensor, which the aforementioned Avoids disadvantages.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Spulenkörper der Spule in mindestens zwei Abschnitte unterteilt ist und daß die Wicklungsdichten in den Abschnitten verschieden sind oder alternativ auch dadurch, daß die Wicklungsdichte der Spule über die bewickelte Länge des Spulenkörpers exponentiell ansteigt oder abfällt.This object is achieved according to the invention solved, that the bobbins the coil is divided into at least two sections and that the winding densities are different in the sections or alternatively because that the Winding density of the coil the wound length of the bobbin increases or decreases exponentially.

Vorteilhafterweise benötigt der erfindungsgemäße Wegsensor, verglichen mit der Spulenlänge einen nur relativ kurzen Spulenkern; aus den bereits oben aufgeführten Gründen sollte die Länge des Spulenkerns allerdings die Größe der axialen Abschnitte der Spulenbewicklung nicht unterschreiten. Vorteilhaft ist es daher, mehrere Wicklungsabschnitte vorzusehen, deren Wicklungsdichten sich jeweils um einen konstanten Faktor unterscheiden oder, als Grenzfall, eine über die Spulenlänge exponentiell zunehmende (bzw. je nach Betrachtungsrichtung abnehmende) Bewicklungsdichte vorzusehen.Advantageously, the displacement sensor according to the invention, compared to the coil length a relatively short coil core; for the reasons already listed above the length of the coil core, however, the size of the axial sections of the Do not fall below the coil winding. It is therefore advantageous to provide several winding sections whose winding densities differentiate each by a constant factor or, as a borderline case, one over the coil length exponentially increasing (or decreasing depending on the viewing direction) To provide winding density.

Vorteilhaft ist auch, daß der Wegsensor über seinen Stellweg ein lineares und ein sich in nur einer Richtung änderndes Meßsignal liefert.It is also advantageous that the displacement sensor over its Travel is a linear and one changing in only one direction measuring signal supplies.

Im folgenden wird ein Ausführungsbeispiel eines erfindungsgemäßen Wegsensors anhand der Zeichnung dargestellt und näher erläutert.In the following an embodiment of a displacement sensor according to the invention illustrated with the aid of the drawing and explained in more detail.

Es zeigen:Show it:

1 und 2 schematisch den Aufbau eines Wegsensors, 1 and 2 schematically the construction of a displacement sensor,

3 Skizzen zur Verwendung des Wegsensors, 3 Sketches for using the displacement sensor,

4 eine schematisch dargestellte Schaltungsanordnung zur Auswertung der Ausgangssignale des Wegsensors. 4 a schematically illustrated circuit arrangement for evaluating the output signals of the displacement sensor.

Der Prinzipaufbau eines erfindungsgemäßen Wegsensors ist in der 1 dargestellt. Der Spulenkörper ist in axialer Richtung in mehrere Abschnitte, hier als Sektoren (S1 bis S5) bezeichnet, wobei die Wicklungsdichte von Sektor S1 bis Sektor S5 immer weiter zunimmt, und zwar von Sektor zu Sektor um jeweils einen konstanten Faktor.The basic structure of a displacement sensor according to the invention is shown in 1 shown. The bobbin is axially divided into several sections, here referred to as sectors (S1 to S5), the winding density increasing from sector S1 to sector S5, namely from sector to sector by a constant factor in each case.

Zur vereinfachten Herstellung der Spule kann für jeden Abschnitt auf dem Spulenkörper vorteilhaft eine eigene Spulenkammer vorgesehen werden. Dies ist in der Figur nicht dargestellt, jedoch in der Darstellung der 3 angedeutet.To simplify the manufacture of the coil, a separate coil chamber can advantageously be provided for each section on the coil body. This is not shown in the figure, but in the representation of the 3 indicated.

Anstelle einer Unterteilung des Spulenkörpers in Abschnitte mit unterschiedlicher Wicklungsdichte kann auch vorteilhaft vorgesehen werden, daß die Wicklungsdichte über die axiale Länge des Spulenkörpers kontinuierlich exponentiell ansteigt oder abfällt.Instead of dividing the bobbin into Sections with different winding densities can also be advantageous be provided that the Winding density over the axial length of the bobbin continuously increases or decreases exponentially.

Die 2 zeigt eine Schnittzeichnung durch den in der 1 dargestellten Aufbau. Im Inneren des als Hohlzylinder ausgeführten Spulenkörper ist ein als Rohr- oder Vollkern ausgebildeter Spulenkern angeordnet. Dieser ist in diesem Ausführungsbeispiel mit einem Schwimmer verbunden, so daß der dargestellte Wegsensor als Flüssigkeitsniveausensor verwendet werden kann.The 2 shows a sectional drawing through the in the 1 shown structure. A coil core designed as a tubular or solid core is arranged in the interior of the coil core, which is designed as a hollow cylinder. In this exemplary embodiment, this is connected to a float, so that the displacement sensor shown can be used as a liquid level sensor.

Wie die 3 andeutet, kann der Spulenkern aber auch durch starre (3a), flexible (3b) oder halbstarre (3c) Verbindungsmittel innerhalb des Spulenkerns verschoben werden, was eine Vielzahl verschiedener Anwendungsmöglichen für den Wegsensor eröffnet.As the 3 indicates that the coil core can also be replaced by rigid ( 3a ), flexible ( 3b ) or semi-rigid ( 3c ) Connecting means are displaced within the coil core, which opens up a multitude of different possible uses for the displacement sensor.

In der 4 ist schematisch eine Auswerteschaltung für den erfindungsgemäßen Wegsensor dargestellt. Eine stabilisierte Spannung Ustab versorgt die Schaltungsanordnung. Ein Quarzoszillator gibt über den Transistor T und den Widerstand R eine konstante Frequenz auf die Schwingkreisanordnung (L, C), die aus einem Kondensator C und der den Wegsensor ausbildenden Spule L besteht.In the 4 an evaluation circuit for the displacement sensor according to the invention is shown schematically. A stabilized voltage U stab supplies the circuit arrangement. A quartz oscillator outputs a constant frequency via the transistor T and the resistor R to the resonant circuit arrangement (L, C), which consists of a capacitor C and the coil L forming the displacement sensor.

Die an der Schwingkreisanordnung (L, C) entstehende Spannung wird durch die Diode D gleichgerichtet und über das Dämpfungsglied (R1, C1) und den Impedanzwandler IC als Ausgangsspannungsspannung Uaus an den Schaltungsausgang gegeben.The voltage that arises at the resonant circuit arrangement (L, C) is rectified by the diode D and is output via the attenuator (R1, C1) and the impedance converter IC as the output voltage voltage U out to the circuit output.

Die Ausgangsspannung Uaus ist eine Funktion der Spuleninduktivität, die sich hier linear mit der Bewegung des Spulenkerns im Spulenkörper ändert. Unter Zuhilfenahme der 1 kann man die verschiedenen Wicklungsabschnitte der Spule als jeweils eine Reihenschaltung von Einzelspulen mit unterschiedlichen Induktivitätswerten betrachten. Je nach Lage des Kerns innerhalb des Spulenkörpers verstärkt dieser die in den verschiedenen Abschnitten unterschiedlich hohen Induktivitätswerte noch um einen Faktor, so daß bei einer Bewegung des Kerns durch den Spulenkörper eine lineare Änderung der Gesamtinduktivität der Spule resultiert.The output voltage U out is a function of the coil inductance, which changes here linearly with the movement of the coil core in the coil body. With the help of 1 you can consider the different winding sections of the coil as a series connection of individual coils with different inductance values. Depending on the position of the core within the coil former, this increases the inductance values, which differ in the different sections, by a factor, so that a linear change in the total inductance of the coil results when the core moves through the coil former.

Claims (4)

Induktiver Wegsensor mit einer in einen verstimmbaren Schwingkreis geschalteten elektrischen Spule und einem in der Spule verschieblich angeordneten Spulenkern, dadurch gekennzeichnet, daß der Spulenkörper der Spule in mindestens zwei Abschnitte unterteilt ist und daß die Wicklungsdichten in den Abschnitten verschieden sind.Inductive displacement sensor with an electrical coil connected in a detunable oscillating circuit and a coil core arranged displaceably in the coil, characterized in that the coil body of the coil is divided into at least two sections and that the winding densities in the sections are different. Induktiver Wegsensor nach Anspruch 1, dadurch gekennzeichnet, daß der Spulenkörper mindestens drei Abschnitte aufweist und daß sich die Wicklungsdichte in jeweils aufeinanderfolgenden Abschnitten um einen konstanten Faktor unterscheidet.Inductive displacement sensor according to claim 1, characterized in that the bobbins has at least three sections and that the winding density in consecutive sections by a constant Factor differs. Induktiver Wegsensor nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Länge des Spulenkerns der axialen Ausdehnung der Wicklungsabschnitte entspricht.Inductive displacement sensor according to claim 1 or 2, characterized characterized that the Length of Coil core corresponds to the axial extent of the winding sections. Induktiver Wegsensor mit einer in einen verstimmbaren Schwingkreis geschalteten elektrischen Spule und einem in der Spule verschieblich angeordneten Spulenkern, dadurch gekennzeichnet, daß die Wicklungsdichte der Spule über die bewickelte Länge des Spulenkörpers exponentiell ansteigt oder abfällt.Inductive displacement sensor with one in a detunable Resonant circuit switched electrical coil and one in the coil movably arranged coil core,  characterized,  that the winding density the coil over the wound length of the bobbin increases or decreases exponentially.
DE2002155710 2002-11-29 2002-11-29 Inductive displacement sensor has electrical coil in detunable oscillating circuit, movable coil core in coil, coil body divided into at least two sections with different winding densities Withdrawn DE10255710A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7812597B2 (en) 2006-12-28 2010-10-12 Sick Ag Inductive magnetic position sensor
CN101561243B (en) * 2009-05-25 2011-01-26 济南铁路天龙高新技术开发有限公司 Frequency-modulation variable area eddy current displacement sensor
WO2014111218A1 (en) * 2013-01-18 2014-07-24 Zf Friedrichshafen Ag Coil arrangement having two coils

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Publication number Priority date Publication date Assignee Title
FR1144347A (en) * 1955-03-03 1957-10-11 Glanzstoff Ag Remote measurement indicator
CH492202A (en) * 1968-12-07 1970-06-15 Brunner Alfred Dipl Ing Dr Stroke signal transmitter
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
GB1559091A (en) * 1976-11-24 1980-01-16 Marconi Co Ltd Position-voltage transducers
DE3303994A1 (en) * 1982-02-17 1983-08-25 Deutsche Itt Industries Gmbh, 7800 Freiburg POSITION MEASURING DEVICE
DE3518772A1 (en) * 1985-05-24 1986-11-27 Robert Bosch Gmbh, 7000 Stuttgart SENSOR ARRANGEMENT
DE3801779A1 (en) * 1988-01-22 1989-07-27 Vdo Schindling Displacement sensor
DE4027028A1 (en) * 1990-08-27 1992-03-05 Prominent Dosiertechnik Gmbh METHOD AND DEVICE FOR DETERMINING THE FLOW RATE OF A FLUID WITH A PULSATING FLOW
DE4301239A1 (en) * 1993-01-19 1994-07-21 Bosch Gmbh Robert Contactless position determination appts., e.g. for shock absorber
US5453685A (en) * 1993-07-30 1995-09-26 Philips Electronics North America Corporation Inductive position sensing device and apparatus with selectable winding configuration
DE19718150A1 (en) * 1997-04-30 1998-11-05 Hottinger Messtechnik Baldwin Inductive displacement sensor

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1144347A (en) * 1955-03-03 1957-10-11 Glanzstoff Ag Remote measurement indicator
CH492202A (en) * 1968-12-07 1970-06-15 Brunner Alfred Dipl Ing Dr Stroke signal transmitter
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
GB1559091A (en) * 1976-11-24 1980-01-16 Marconi Co Ltd Position-voltage transducers
DE3303994A1 (en) * 1982-02-17 1983-08-25 Deutsche Itt Industries Gmbh, 7800 Freiburg POSITION MEASURING DEVICE
DE3518772A1 (en) * 1985-05-24 1986-11-27 Robert Bosch Gmbh, 7000 Stuttgart SENSOR ARRANGEMENT
DE3801779A1 (en) * 1988-01-22 1989-07-27 Vdo Schindling Displacement sensor
DE4027028A1 (en) * 1990-08-27 1992-03-05 Prominent Dosiertechnik Gmbh METHOD AND DEVICE FOR DETERMINING THE FLOW RATE OF A FLUID WITH A PULSATING FLOW
DE4301239A1 (en) * 1993-01-19 1994-07-21 Bosch Gmbh Robert Contactless position determination appts., e.g. for shock absorber
US5453685A (en) * 1993-07-30 1995-09-26 Philips Electronics North America Corporation Inductive position sensing device and apparatus with selectable winding configuration
DE19718150A1 (en) * 1997-04-30 1998-11-05 Hottinger Messtechnik Baldwin Inductive displacement sensor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7812597B2 (en) 2006-12-28 2010-10-12 Sick Ag Inductive magnetic position sensor
DE102006061771B4 (en) * 2006-12-28 2014-12-31 Sick Ag Magnetic displacement sensor with linear characteristic of the output signal
CN101561243B (en) * 2009-05-25 2011-01-26 济南铁路天龙高新技术开发有限公司 Frequency-modulation variable area eddy current displacement sensor
WO2014111218A1 (en) * 2013-01-18 2014-07-24 Zf Friedrichshafen Ag Coil arrangement having two coils

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