DE8714886U1 - Temperature compensated sensor for detecting movements - Google Patents
Temperature compensated sensor for detecting movementsInfo
- Publication number
- DE8714886U1 DE8714886U1 DE8714886U DE8714886U DE8714886U1 DE 8714886 U1 DE8714886 U1 DE 8714886U1 DE 8714886 U DE8714886 U DE 8714886U DE 8714886 U DE8714886 U DE 8714886U DE 8714886 U1 DE8714886 U1 DE 8714886U1
- Authority
- DE
- Germany
- Prior art keywords
- hall generator
- hall
- permanent magnet
- generator
- sensor according
- 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.)
- Expired
Links
- 244000309464 bull Species 0.000 claims 1
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/488—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by variable reluctance detectors
-
- 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
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
- G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves
-
- 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
- G01D5/142—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 using Hall-effect devices
- G01D5/145—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 using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/006—Details of instruments used for thermal compensation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
- H03K17/95—Proximity switches using a magnetic detector
- H03K17/9517—Proximity switches using a magnetic detector using galvanomagnetic devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/9401—Calibration techniques
- H03K2217/94015—Mechanical, e.g. by displacement of a body, a shielding element, or a magnet, in or out of the sensing area
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)
Description
t It I
127 DE 26 3127 EN 26 3
BeschreibungDescription
Die Erfindung bezieht sich auf einen temperaturkompensierten Sensor zur Erfassung Von Bewegungen.The invention relates to a temperature-compensated sensor for detecting movements.
Bei sich bewegenden Meßobjekten, z.B. Wellen, Zahnrädern, Zahnstangen, Diaphragmas von Druckdosen, Ankern vonFor moving measuring objects, e.g. shafts, gears, racks, diaphragms of pressure cells, anchors of
fctSilmSyi"StSn, vuiifctSilmSyi"StSn, vuii
Stangen und dergleichen müssen Bewegungen gemessen werden* Zum einen können die zu messenden Bewegungen bei Präzisionsvorrichtungen sehr klein sein, und zum anderen kommt es vor, daß hohe Betriebstemperatur herrscht. Es ist bekannt, an den sich bewegenden und zu messenden Meßobjekten Dauermagnete anzubringen, die in eine Wirkbeziehung mit einem stationär angebrachten Hallgenerator treten. Ist das betreffende Meßobjekt z.B. ein in einem Getriebe laufendes Zahnrad, ist diese bekannte Maßnahme, also die Anbringung eines Dauermagneten an dem zu messenden Zahnrad, keine brauchbare Lösung t weil sich der metallische Abrieb des Zahnrads, in der Regel Stahl, an dem Dauermagneten anlagert und die Empfindlichkeit der aus Dauermagneten und Hallgenerator bestehenden Meßanordnung beeinträchtigt. Ferner haben bekannte Sensoren eine erhebliche Temperaturdrift, die insbesondere bei hohen Temperaturen - ein Meßergebnis stark verfälschen.Rods and the like must have their movements measured* Firstly, the movements to be measured in precision devices can be very small, and secondly, it can happen that the operating temperature is high. It is known to attach permanent magnets to the moving objects to be measured, which interact with a stationary Hall generator. If the object to be measured is, for example, a gear wheel running in a transmission, this known measure of attaching a permanent magnet to the gear wheel to be measured is not a suitable solution because the metallic abrasion of the gear wheel, usually steel, accumulates on the permanent magnet and impairs the sensitivity of the measuring arrangement consisting of permanent magnets and Hall generator. Furthermore, known sensors have a considerable temperature drift, which can seriously distort a measurement result, especially at high temperatures.
f] Der Erfindung liegt die Aufgabe zugrunde, einen &igr; f] The invention is based on the object of providing a &igr;
Sensor der eingangserwähnten Art zu schaffen, der % Sensor of the type mentioned above, which %
weitgehend unabhängig von der Betriebstemperatur eine J präzise Messung auch bei gegen Null gehender Bewegung der | zu messenden Meßobjekte erlaubt. Ilargely independent of the operating temperature, a precise measurement is possible even when the movement of the objects to be measured is approaching zero. I
Erfindungsgemäß wird die Aufgabe durch die im Kennzeichen § des Anspruchs 1 aufgeführten Merkmale gelöst. !According to the invention, the object is achieved by the features listed in the characterizing section of claim 1. !
127 DE 26 "" 4127 EN 26 "" 4
Die Erfindung Weist gegenüber dem Bekannten die Vorteile auf, daß selbst bei hoher Betriebstemperatur sehr kleine und auch größere Bewegungen des betreffenden Meßöbjekts mit hoher Präzision gemessen werden können» Dabei beeinträchtigen selbst Störeinstrahlungen das Meßefgebnis nicht, weil sie durch Anwendung zweier Hallgeneratören kompensiert werden« Es ist nicht notwendig,, daß ein Magnet an dem sich bewegenden Meßobjekt angebracht wird. Weil sich dementsprechend kein metallischer Abrieb an dem Meßobjekt aufgrund der Wirkung eines zu der Meßvorrichtung gehörenden Dauermagneten anlagern kann, kann das Meßergebnis durch Materialabrieb nicht verändert werden.The invention has the advantage over the known that even at high operating temperatures, very small and also larger movements of the measuring object in question can be measured with high precision. Even interference does not affect the measuring result because it is compensated by the use of two Hall generators. It is not necessary for a magnet to be attached to the moving measuring object. Because no metallic abrasion can accumulate on the measuring object due to the effect of a permanent magnet belonging to the measuring device, the measuring result cannot be changed by material abrasion.
Weitere vorteilhafte Ausgestaltungen der* Erfindung gehen aus den Ansprüchen und der nachfolgenden Beschreibung hervor.Further advantageous embodiments of the invention emerge from the claims and the following description.
Die Erfindung wird an einem Ausführungsbeispiel anhand einer Zeichnung erläutert.The invention is explained using an embodiment with reference to a drawing.
Die Bewegung eines Meßobjekts 12 soll erfaßt werden. Hierzu dient ein Sensor 1.The movement of a measuring object 12 is to be recorded. A sensor 1 is used for this purpose.
Der Sensor 1 umfaßt einen ersten Hallgenerator 5, einen mit einem seiner Pole, bei einem Ausführungsbeispiel dem Südpol 3, dem ersten Hallgenerator 5 zugekehrten Dauermagneten 4 und einen dem anderen Pol des Dauermagneten 4, beim Ausfuhrungsbeispiel dem Nordpol 6, zugekehrten zweiten Hallgeneratör 2.The sensor 1 comprises a first Hall generator 5, a permanent magnet 4 with one of its poles, in one embodiment the south pole 3, facing the first Hall generator 5 and a second Hall generator 2 facing the other pole of the permanent magnet 4, in the embodiment the north pole 6.
Mit dem ersten Hallgenerator 5 soll die Bewegung des Meßobjekts 12, z.B. in Richtung eines Pfeils 13, erfaßt werden.The first Hall generator 5 is intended to detect the movement of the measuring object 12, e.g. in the direction of an arrow 13.
Der Sensor 1 wird mittels des Dauermagneten 4 vorgespannt. Hierdurch sind sehr kleine magnetische Flußänderungen meßbar, die durch die Bewegung des Meßobjekts 12 mit demThe sensor 1 is pre-tensioned by means of the permanent magnet 4. This makes it possible to measure very small magnetic flux changes that are caused by the movement of the measuring object 12 with the
127 DE 26 '" ' 5' 127 EN 26 '" ' 5'
ersten Hallgeneratör 5 erfaßbar sind«first Hall generator 5 can be detected«
An die die Hallspannung führenden Elektroden des ersten Hallgenerators 5 sind die Eingange eines Differenzverstärkers 8 angeschlossen. An die die Hallspannung führenden Elektroden des zweiten Hallgenerators 2 sind die Eingänge eines Weiteren Differenzverstärkers 7 angeschlossen* Die Ausgänge der beiden Differenzverstärker 7, 8 sind an die Eingänge eines weiterem Differenzverstärkers 9 angeschlossen, dessen Ausgang auf den Eingang eines Impulsformers 10 gelegt ist. Der Impulsformer 10 ist beim Ausführungsbeispiel ein Schmitt-Trigger, der an seinem Ausgang eine Rechteckspannung liefert. Die Rechtecksp"annung kann einem (in der Zeichnung nicht dargestellten) Anzeigegerät zugeführt werden, das die Anzeige entsprechend der Bewegung des Meßobjekts 12 zur Verfügung stellt.The inputs of a differential amplifier 8 are connected to the electrodes of the first Hall generator 5 that carry the Hall voltage. The inputs of another differential amplifier 7 are connected to the electrodes of the second Hall generator 2 that carry the Hall voltage. The outputs of the two differential amplifiers 7, 8 are connected to the inputs of another differential amplifier 9, whose output is connected to the input of a pulse former 10. In the embodiment, the pulse former 10 is a Schmitt trigger that delivers a square-wave voltage at its output. The square-wave voltage can be fed to a display device (not shown in the drawing) that provides the display according to the movement of the measurement object 12.
Die eine Steuerstrom-Elektrode des ersten Hallgenerators 5 ist galvanisch mit der einen Steuerstrom-Elektrode des zweiten H'allgenerators 2 verbunden. An den Ausgang des Differenzverstärkers 7, dessen Eingänge mit den ctie Hallspannung führenden Elektroden des zweiten Hallgenerators 2 verbunden sind, ist der Eingang eines Stromreglers 11 angeschlossen, dessen Ausgänge an die jeweils andere Steuerstrom-Elektrode des ersten Hallgenerators 5 bzw. zweiten Hallgenerators 2 gelegt sind.One control current electrode of the first Hall generator 5 is galvanically connected to one control current electrode of the second Hall generator 2. The input of a current regulator 11 is connected to the output of the differential amplifier 7, whose inputs are connected to the Hall voltage-carrying electrodes of the second Hall generator 2, and whose outputs are connected to the other control current electrode of the first Hall generator 5 or second Hall generator 2.
Der erste Hallgenerator 5 einerseits und der zweite Hallgenerator 2 andererseits befinden sich unmittelbar an dem Dauermagneten 4. Letzterer bildet mit den beiden Hallgeneratoren 2, 5 eine bauliche Einheit. DerThe first Hall generator 5 on the one hand and the second Hall generator 2 on the other hand are located directly on the permanent magnet 4. The latter forms a structural unit with the two Hall generators 2, 5. The
j Dauermagnet 4 soll sehr klein gehalten werden. Je kleinerj Permanent magnet 4 should be kept very small. The smaller
die kompakte Baueinheit ist, umso größer ist die Wahrscheinlichkeit, daß beide Hallgeneratoren 2, 5 beithe more compact the unit is, the greater the probability that both Hall generators 2, 5 at
127 DE 26127 EN 26
einer iincierunj äei- ürrigebungsteinpeifätür deif gleichen Temperaturänderung ausgesetzt Werden4 Mit Hilfe der beschriebenen Schaltung äuö dem Differenzverstärker 7 in Verbindung mit ' dem Strömregler 1 1 werden Änderungen der Umgebungstemperatur kompensiert. Gleichermaßen wirken S-hörstrahiüngen auf beide Hailgenerätören 2, 5 ein, so daß wegen der beschriebenen Kompensationswirküng auch Störstrahlungen das Meßergebnis nicht beinfJLUssen können.an induction loop with the same temperature change 4 With the help of the described circuit of the differential amplifier 7 in conjunction with the current regulator 11, changes in the ambient temperature are compensated. S-radiation acts equally on both hail generators 2, 5, so that due to the described compensation effect, interference radiation cannot influence the measurement result.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8714886U DE8714886U1 (en) | 1987-11-09 | 1987-11-09 | Temperature compensated sensor for detecting movements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8714886U DE8714886U1 (en) | 1987-11-09 | 1987-11-09 | Temperature compensated sensor for detecting movements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE8714886U1 true DE8714886U1 (en) | 1987-12-17 |
Family
ID=6813910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE8714886U Expired DE8714886U1 (en) | 1987-11-09 | 1987-11-09 | Temperature compensated sensor for detecting movements |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE8714886U1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993012403A1 (en) * | 1991-12-19 | 1993-06-24 | Swf Auto-Electric Gmbh | Sensor of the speed of rotation, in particular of toothed wheels |
| EP0629834A1 (en) * | 1992-03-02 | 1994-12-21 | Seiko Epson Corporation | Displacement sensor |
| EP0706053A1 (en) * | 1994-10-04 | 1996-04-10 | Murata Manufacturing Co., Ltd. | Acceleration sensor |
| EP2704328A1 (en) * | 2012-08-28 | 2014-03-05 | K.A. Schmersal Holding GmbH & Co. KG | Sensor device and method for detecting a ferromagnetic actuator |
-
1987
- 1987-11-09 DE DE8714886U patent/DE8714886U1/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993012403A1 (en) * | 1991-12-19 | 1993-06-24 | Swf Auto-Electric Gmbh | Sensor of the speed of rotation, in particular of toothed wheels |
| EP0629834A1 (en) * | 1992-03-02 | 1994-12-21 | Seiko Epson Corporation | Displacement sensor |
| EP0629834A4 (en) * | 1992-03-02 | 1996-07-03 | Seiko Epson Corp | Displacement sensor. |
| EP0706053A1 (en) * | 1994-10-04 | 1996-04-10 | Murata Manufacturing Co., Ltd. | Acceleration sensor |
| US5677485A (en) * | 1994-10-04 | 1997-10-14 | Murata Manufacturing Co., Ltd. | Acceleration sensor with compensation for ambient temperature change |
| EP2704328A1 (en) * | 2012-08-28 | 2014-03-05 | K.A. Schmersal Holding GmbH & Co. KG | Sensor device and method for detecting a ferromagnetic actuator |
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