DE1027107B - Inductive encoder - Google Patents

Inductive encoder

Info

Publication number
DE1027107B
DE1027107B DET6986A DET0006986A DE1027107B DE 1027107 B DE1027107 B DE 1027107B DE T6986 A DET6986 A DE T6986A DE T0006986 A DET0006986 A DE T0006986A DE 1027107 B DE1027107 B DE 1027107B
Authority
DE
Germany
Prior art keywords
coils
inductive
bridge
core
consist
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.)
Pending
Application number
DET6986A
Other languages
German (de)
Inventor
Dr-Ing Rolf Coermann
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.)
Dr Thiedig GmbH and Co KG
Original Assignee
Dr Thiedig 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 Dr Thiedig GmbH and Co KG filed Critical Dr Thiedig GmbH and Co KG
Priority to DET6986A priority Critical patent/DE1027107B/en
Publication of DE1027107B publication Critical patent/DE1027107B/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING 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
    • G01D5/00Mechanical 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
    • G01D5/12Mechanical 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
    • G01D5/14Mechanical 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
    • G01D5/20Mechanical 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • GPHYSICS
    • G08SIGNALLING
    • G08CTRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00Electric signal transmission systems
    • G08C19/02Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage
    • G08C19/06Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage using variable inductance

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)

Description

Das induktive Meßverfahren wurde bisher in der Technik verschiedentlich angewendet, konnte sich aber trotz seiner vielen Vorteile bis jetzt nicht allgemein durchsetzen. Der Grund liegt sowohl in dem dafür bisher benötigten relativ hohen Aufwand und ganz besonders in der umständlichen Handhabung der bisherigen Verfahren.The inductive measuring method has been used variously in technology, but could not yet generally accepted despite its many advantages. The reason lies both in the for it so far required relatively high effort and especially in the cumbersome handling of the previous one Procedure.

Man war der Ansicht, daß es beim Bau größerer Geber, die eine entsprechende größere Leistung abgeben sollten, unbedingt nötig ist, das Material in den magnetischen Kreisen zu lameliieren. Das bedingt die Anwendung von U- oder M-Kernen aus lamellierten Blechen.It was believed that when larger donors were built, they would deliver a correspondingly greater output should, it is absolutely necessary to laminate the material in the magnetic circuits. That requires the Use of U or M cores made of laminated sheets.

Der in den magnetischen Kreis eingefügte Luftspalt, der durch die zu messende Größe verändert wird, soll proportional der Meßgröße den Scheinwiderstand der Spulen möglichst stark verändern. Dazu ist es aber erforderlich, daß möglichst alle Kraftlinien über diesen veränderlichen Luftspalt gehen. U- und M-Kerne haben eine hohe Streuung, wodurch der Wirkungsgrad der Meßeinrichtung nicht den Erwartungen entspricht, so daß kostspielige Verstärker angewendet werden mußten, um die erforderlichen Leistungen zu erreichen.The air gap inserted in the magnetic circuit, which is changed by the size to be measured, should change the impedance of the coils as much as possible in proportion to the measured variable. But that's it It is necessary that as many lines of force as possible go over this variable air gap. U and M cores have a high degree of scatter, which means that the efficiency of the measuring device does not meet expectations, so that expensive amplifiers had to be used to achieve the required performance reach.

Die umständliche Handhabung der Meßgeräte mit induktiven Meßgebern war die Folge der angewendeten elektrischen Schaltung. Die Meßbrücke wurde bisher beim induktiven Meßverfahren aus zwei gegensinnig veränderlichen Induktivitäten und zwei ohmschen Widerständen, die zum Abgleich veränderlich sind, aufgebaut. Das hat den Vorteil, daß infolge des relativ hohen Blindwiderstandes dieser Induktivitäten ein Abgleich der Brücke nicht möglich war, so daß man am Brückenausgang nie den AVert Null erreichen konnte. Dies konnte nur durch den Einbau eines RC-Gliedes in die Brücke erreicht werden (s. Abb. 1).The cumbersome handling of the measuring devices with inductive measuring transducers was the result of the electrical circuit used. In the inductive measuring process, the measuring bridge was previously built up from two oppositely variable inductances and two ohmic resistors that can be changed for the purpose of balancing. This has the advantage that, due to the relatively high reactance of these inductances, it was not possible to balance the bridge, so that the A value of zero could never be reached at the bridge output. This could only be achieved by installing an RC element in the bridge (see Fig. 1).

Um die Brücke vollständig abzugleichen, mußte man abwechselnd die Widerstände des ohmschen Brückenzweiges und des i?C-Gliedes verändern, bis der Abgleich erreicht war. Man benötigte also zwei Potentiometer und einen Kondensator, die außerhalb des Gebers lagen und deren Bedienung sehr umständlich und zeitraubend war. Außerdem konnte die Brücke durch die verschiedenen Temperaturkoeffizienten ihrer Teile leicht gestört werden.In order to balance the bridge completely, one had to alternate the resistances of the ohmic Change the bridge branch and the i? C element until the alignment was achieved. So it took two Potentiometer and a capacitor, which were outside of the encoder and which are very cumbersome to use and was time consuming. In addition, the bridge was able to use the different temperature coefficients of its Parts are easily disturbed.

Man hat daher verschiedentlich versucht, die Meßbrücke aus vier möglichst gleichen Teilen aufzubauen. Aber weder die Verwendung der geteilten Sekundärspule des Speisetransformators noch die Anwendung von irgendwelchen Hilfsspulen haben den gewünschten Erfolg gebracht, da es bisher unmöglich war, diese Induktivitäten in ihren reellen und imaginären Widerständen so gleichzumachen, daß auf den Phasenabgleich der Brücke verzichtet werden konnte. Dieses Induktiver MeßgeberVarious attempts have therefore been made to build the measuring bridge to be built from four equal parts if possible. But neither the use of the split secondary coil the supply transformer nor the use of any auxiliary coils have the desired Brought success because it was previously impossible to find these inductors in their real and imaginary resistances to be made level in such a way that the phase adjustment of the bridge could be dispensed with. This Inductive transducer

Anmelder:Applicant:

Dr. Thiedig & Co. K. G.,
Berlin SO 36, Lausitzer Str. 10
Dr. Thiedig & Co. KG,
Berlin SO 36, Lausitzer Str. 10

Dr.-Ing. Rolf Coermann, Yellow Springs, OhioDr.-Ing. Rolf Coermann, Yellow Springs, Ohio

(V. St. A.)
ist als Erfinder genannt worden
(V. St. A.)
has been named as the inventor

Ziel kann erst dadurch erreicht werden, daß erfindungsgemäß die vier Induktivitäten der Meßbrücke aus Spulen gebildet werden, deren Wicklungen paarweise, und zwar jeweils die beiden in der Brücke sich gegenüberliegenden Induktivitäten, auf einen Magnetkern gleichzeitig, parallel und nebeneinander aufgewickelt werden. Dadurch erhält man eine Brücke aus Induktivitäten, von denen die zwei gegenüberliegenden im Betrag und Phase absolut gleich sind, da sie zwangläufig von den gleichen Kraftlinien geschnitten werden, sofern ihre Drahtlängen gleich sind. Man kann dann durch mechanische Justierung des Ankers die Brücke vollkommen auf Null abgleichen und in dieser Stellung dann den Anker fixieren. Der Geber bedarf dann keinerlei weiteren Bedienung. Durch phasenabhängige Gleichrichtung erhält man dann einen Gleichstrom, der weitgehend proportional dem Meßwert ist.The goal can only be achieved by the fact that, according to the invention, the four inductances of the measuring bridge are formed from coils, the windings of which in pairs, namely the two in the bridge itself opposing inductors, wound on a magnetic core simultaneously, parallel and next to each other will. This creates a bridge of inductors, the two of which are opposite are absolutely equal in amount and phase, since they inevitably cut by the same lines of force as long as their wire lengths are the same. You can then adjust the armature mechanically Adjust the bridge completely to zero and then fix the anchor in this position. The giver then no further operation is required. One then obtains through phase-dependent rectification a direct current that is largely proportional to the measured value.

Die Empfindlichkeit des Gebers wird erfindungsgemäß dadurch erhöht, daß die beiden Magnetkreise aus zwei magnetisch getrennten Topfkreisen aufgebaut werden, die aus zwei aus Material mit hoher Permeabilität gedrehten Teilen, dem Kern und dem Mantel, bestehen. Der Kern, auf dem die beiden nach oben beschriebener Methode gewickelten Spulen sitzen, wird mit Preßsitz in den Mantel eingedrückt, so daß kein Luftspalt zwischen ihnen bleibt. Nur zur Herausführung der Drähte werden Nuten in den Kernflansch eingefräst. Der Aufbau einer solchen Geberspule wird dadurch sehr einfach, zumal man an den Kernflansch unmittelbar mit Isolierscheiben die Lötösen für den Spulenanschluß befestigen kann. Am anderen Ende des Kerns werden die Spulen durch Isolierscheiben gehalten. Diesem Ende steht der Anker in 1I16 oder Y20 mm Entfernung gegenüber. Da die bei-The sensitivity of the transmitter is increased according to the invention in that the two magnetic circuits are built up from two magnetically separated cup circles, which consist of two parts, the core and the jacket, made of material with high permeability. The core, on which the two coils wound according to the method described above sit, is pressed into the jacket with a press fit so that no air gap remains between them. Grooves are milled into the core flange only to lead out the wires. This makes the construction of such a transmitter coil very simple, especially since the soldering lugs for the coil connection can be attached directly to the core flange with insulating washers. At the other end of the core, the coils are held in place by insulating washers. Opposite this end is the anchor at a distance of 1 I 16 or Y 20 mm. Since the two

709 957/278709 957/278

den Topfmagnete vollkommen unabhängig voneinander sind, kann man sie entweder auf den beiden Seiten eines Ankers oder mit jeweils getrenntem Anker befestigen, je nachdem es der mechanische Aufbau des Meßgerätes erfordert.the pot magnets are completely independent of each other, you can either use them on the two Fasten sides of an anchor or with each separate anchor, depending on the mechanical structure of the measuring device.

Der Aufbau eines solchen induktiven Gebers ist aus Abb. 2 zu erkennen: Auf dem Kern 1, der an einem Ende den Kernflansch 2 trägt, sind in beschriebener Weise zwei Spulen 3 aufgewickelt. Am anderen Ende des Kerns 1 werden die Spulen durch eine Scheibe 4 aus unmagnetischem Material gehalten. Der Kern wird mit den Spulen und der Scheibe 4 so in den Mantel 5 eingepreßt, daß er mit dem einen Ende des Mantels bündig abschließt. Am anderen Ende des Mantels werden unter Verwendung von Isolierscheiben 6 und 7 die vier Lötösen 8 an dem Kernflansch 2 befestigt. Zwischen den beiden Topfmagneten, deren gegenseitiger Abstand konstant gehalten wird, befindet sich der Anker 9, der sich proportional dem Meßwert bewegt.The structure of such an inductive transmitter can be seen in Fig. 2: On the core 1, which is on one end carries the core flange 2, two coils 3 are wound in the manner described. At the other At the end of the core 1, the coils are held by a disk 4 made of non-magnetic material. Of the The core is pressed into the jacket 5 with the coils and the disc 4 in such a way that it is at one end of the jacket is flush. At the other end of the jacket are made using insulating washers 6 and 7, the four solder lugs 8 are attached to the core flange 2. Between the two pot magnets, whose mutual distance is kept constant, there is the armature 9, which is proportional to the Measured value moved.

Die Schaltung der Spulen erfolgt nach Abb. 3.The coils are switched as shown in Fig. 3.

Claims (2)

Patentansprüche:Patent claims: 1. Induktiver Geber mit vier gleichartigen Induktionsspulen, die paarweise sinngemäß auf die beiden Magnetkreise des induktiven Gebers verteilt sind und deren Induktivitäten durch den Meßvorgang verändert werden, dadurch gekennzeichnet, daß die Drähte der jeweils sich in einem Magnetkreis befindenden beiden Spulen gleichzeitig, parallel und nebeneinander aufgewickelt werden.1. Inductive transmitter with four induction coils of the same type, which are paired analogously to the two magnetic circuits of the inductive encoder are distributed and their inductances through the Measuring process can be changed, characterized in that the wires of each are in a Magnetic circuit located two coils at the same time, wound in parallel and side by side will. 2. Induktiver Geber nach Anspruch 1, dadurch gekennzeichnet, daß die Magnetkreise aus zwei voneinander magnetisch getrennten Topfmagneten bestehen.2. Inductive transmitter according to claim 1, characterized in that the magnetic circuits consist of two consist of magnetically separated pot magnets. In Betracht gezogene Druckschriften:
USA.-Patentschriften Nr. 2 430 757, 2 417 097, 441869;
Considered publications:
U.S. Patent Nos. 2,430,757, 2,417,097, 441869;
P f 1 i e r, Elektrische Messung mechanischer Größen,P f 1 i e r, electrical measurement of mechanical quantities, Verlag Springer, 1948, S. 70, Abb. 80;
ATM V 132-4 und J 86-2.
Verlag Springer, 1948, p. 70, Fig. 80;
ATM V 132-4 and J 86-2.
Hierzu 1 Blatt Zeichnungen1 sheet of drawings © 709 957/278 3.58© 709 957/278 3.58
DET6986A 1952-11-17 1952-11-17 Inductive encoder Pending DE1027107B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DET6986A DE1027107B (en) 1952-11-17 1952-11-17 Inductive encoder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET6986A DE1027107B (en) 1952-11-17 1952-11-17 Inductive encoder

Publications (1)

Publication Number Publication Date
DE1027107B true DE1027107B (en) 1958-03-27

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ID=7545458

Family Applications (1)

Application Number Title Priority Date Filing Date
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1283549B (en) * 1965-09-25 1968-11-21 Kernforschungsanlage Juelich Inductive displacement transducer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2417097A (en) * 1945-04-10 1947-03-11 Howard D Warshaw Variable inductance for telemetering systems
US2430757A (en) * 1944-11-14 1947-11-11 Manning Maxwell & Moore Inc Electrical remote-reading positionindicating apparatus
US2441869A (en) * 1943-06-21 1948-05-18 Bendix Aviat Corp Linear movement self-synchronous system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441869A (en) * 1943-06-21 1948-05-18 Bendix Aviat Corp Linear movement self-synchronous system
US2430757A (en) * 1944-11-14 1947-11-11 Manning Maxwell & Moore Inc Electrical remote-reading positionindicating apparatus
US2417097A (en) * 1945-04-10 1947-03-11 Howard D Warshaw Variable inductance for telemetering systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1283549B (en) * 1965-09-25 1968-11-21 Kernforschungsanlage Juelich Inductive displacement transducer

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