WO1998048285A1 - Sensor device for inductive speed measurement of longitudinally mobile elements and electromagnetic switchgear with such sensor device - Google Patents

Sensor device for inductive speed measurement of longitudinally mobile elements and electromagnetic switchgear with such sensor device Download PDF

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Publication number
WO1998048285A1
WO1998048285A1 PCT/DE1998/000993 DE9800993W WO9848285A1 WO 1998048285 A1 WO1998048285 A1 WO 1998048285A1 DE 9800993 W DE9800993 W DE 9800993W WO 9848285 A1 WO9848285 A1 WO 9848285A1
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Prior art keywords
measuring
sensor device
coil
compensation
compensation coil
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PCT/DE1998/000993
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German (de)
French (fr)
Inventor
Stefan Scheer
Ralf Thar
Stefan Jörgens
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Klöckner-Moeller Gmbh
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Publication of WO1998048285A1 publication Critical patent/WO1998048285A1/en

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    • 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
    • G01D5/2033—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 controlling the saturation of a magnetic circuit by means of a movable element, e.g. a magnet
    • 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
    • G01P3/50—Devices characterised by the use of electric or magnetic means for measuring linear speed
    • G01P3/52—Devices characterised by the use of electric or magnetic means for measuring linear speed by measuring amplitude of generated current or voltage

Definitions

  • the present invention relates to a sensor device for inductive speed measurement of switching contacts of electromagnetic switching devices according to the preamble of claim 1 and an electromagnetic switching device with a sensor device for inductive speed measurement according to claim 7.
  • Sensor devices for measuring the speeds of movable parts use the change in inductance in a coil.
  • the relative movement of an electrical conductor in a magnetic field is used in particular.
  • Various tachometers work according to this principle.
  • a coil is rotated about an axis of rotation within a magnetic field and in this way a voltage which is dependent on the angular velocity of the coil is induced.
  • DE 41 07 292 C1 discloses a sensor arranged in a spring strut, which essentially consists of an annular permanent magnet arranged fixedly within the spring strut cylinder tube and a sensor winding arranged around the spring strut piston rod and thus movable within the permanent magnet.
  • Such sensors have already proven themselves in the past, but are only insufficiently or with a correspondingly high cost protected against electromagnetic stray fields.
  • the present invention has for its object to provide a sensor device or a switching device with such a sensor device, which works reliably and with as little wear as possible with the simplest structure, largely eliminates magnetic stray fields and thus always ensures an accurate inductive measurement of portable parts.
  • the object is achieved by the characterizing features of claim 1 and by the features of claim 7.
  • the sensor device essentially consists of a measuring coil and a permanent magnet which interacts with it.
  • the permanent magnet is in operative connection with the or each part to be detected and is arranged in such a way that it can be moved longitudinally in the stationary measuring coil.
  • the sensor device according to the invention has a compensation coil which, due to its spatial arrangement, is exposed to magnetic stray fields that may occur in a defined ratio.
  • the electromagnetic switching device has a symmetrically constructed magnetic drive, the measuring and compensation coils having identical technical data and being arranged symmetrically such that they are equally exposed to the magnetic stray fields of the magnetic drive.
  • FIG. 2 shows a schematic representation of a magnetic drive for the switching device according to the invention in a possible embodiment (open contact state), and
  • FIG. 3 shows a schematic representation of the magnetic drive for the switching device according to the invention according to FIG. 2 (closed
  • the sensor device for inductive speed measurement of longitudinally movable parts in a schematic manner.
  • the sensor device essentially consists of a measuring coil 4 and, according to the invention, at least one compensation coil 6.
  • the two coils 4, 6 are arranged stationary in the sensor device, the measuring coil 4 being assigned a movable, permanent-magnetic core 8 in the form of a permanent magnet.
  • the permanent magnet 8 which is in operative connection with the switch contacts and moves within the measuring coil 4, becomes a speed-dependent one
  • measuring and compensation coils 4, 6 are essentially identical (same technical data) and both coils 4, 6 are equally exposed to magnetic stray fields with a corresponding spatial arrangement, so that they have identical measured values with respect to the stray fields deliver and thus a problem-free adjustment of the measured values takes place.
  • measuring and compensation coils 4, 6 are preferably electrically connected in series with the opposite winding sense. In particular when the coils 4, 6 are designed differently, provision is made not to connect them in series, but rather to connect each of the coils 4, 6 with their two connections separately to an evaluation unit 10.
  • the evaluation unit 10 preferably consists of two amplifier circuits 12, 14, the first of these amplifier circuits 12 being designed in particular as an impedance converter.
  • the circuit 12 is not absolutely necessary for the implementation and function of the evaluation unit 10 and can therefore be omitted depending on the embodiment of the evaluation unit 10.
  • the second amplifier 14 then serves as an integrator or differentiator in order to use the speed signal to or get acceleration signal.
  • the double arrow arranged next to the permanent magnet 8 is only intended to indicate that this is a part that can be moved in the longitudinal direction.
  • the arrangement according to the invention is used in particular in DC-operated electromagnetic switching devices, such as contactors.
  • the evaluation device 10 is also connected downstream of the coil arrangement 4, 6 for evaluating the measurement signals.
  • the impedance converter 12 and the amplifier circuit 14 prevent on the one hand the drop in the voltage at the measuring coil 4, while the downstream amplifier circuit 14 carries out the actual evaluation of the measuring signal, the amplitude of which is proportional to the speed of the switching contacts.
  • a magnetic drive 24 with a contact carrier device 26 and an inductive measuring device 28 of an electromagnetic switching device according to the invention is shown in a basic representation.
  • the magnet drive 24 is preferably symmetrical and essentially consists of an in particular E-shaped magnet core 30, a drive coil 32 arranged around the middle leg of the magnet core 30 and an E-shaped magnet armature 34.
  • the magnet armature 34 is located in the area of its middle leg the contact carrier device 26 is arranged on its side facing away from the magnetic core 30.
  • the magnetic core 30 and the magnet armature 34 can of course also have any other shape, for example a U-shape or the like.
  • the contact carrier device 26 which consists of a rod-shaped element 36 and a contact element 38 resiliently mounted thereon, also has the measuring device 28.
  • the measuring device 28 is magnetically and electrically insulated from the contact carrier device 26 by means of a carrier element 40.
  • the measuring device 28 essentially consists of measuring and compensation coils 4, 6 and the permanent magnet 8 which is guided longitudinally movably in the measuring coil 4.
  • the permanent magnet 8 is in particular on the carrier element 40 in this way arranged so that it extends substantially parallel to the rod-shaped element 36.
  • a weight element can be arranged diametrically opposite the permanent magnet 8.
  • measuring and compensation coils 4, 6 have essentially identical technical data and are arranged spatially in such a way that they are always equally exposed to the influence of magnetic stray fields and provide essentially identical signals with respect to them. so that the stray field influence in the evaluation device 18 is taken into account and the measurement result is adjusted accordingly.
  • the invention is not limited to the exemplary embodiments described and illustrated, but encompasses all the embodiments having the same effect in the sense of the invention.
  • an embodiment of the sensor device or the switching device is also conceivable in which the measuring coil 4 and the compensation coil 6 are designed differently and are positioned in different magnetic stray fields.

Abstract

The invention relates to a sensor device for inductive speed measurement of longitudinally mobile elements, having at least one measuring coil (4) and one permanent magnet (8) co-operating with said coil. The permanent magnet (8) co-operates with the element (or each element) that is to be detected, and is mounted so as to be mobile in the stationary measuring coil (4). There is also a compensating coil (6) which, owing to its spatial position, is also subjected, to a defined degree, to optionally occurring magnetic leakage fields.

Description

SENSORVORRICHTUNG ZUR INDUKTIVEN GESCHWINDIGKEITSMESSUNG LONGITUDINAL BEWEGLICHER TEILE UND ELEKTROMAGNETISCHES SCHALTGERAET MIT EINER SOLCHEN SENSORVORRICHTUNGSENSOR DEVICE FOR INDUCTIVE SPEED MEASUREMENT OF LONGITUDINAL MOVABLE PARTS AND ELECTROMAGNETIC SWITCHING DEVICE WITH SUCH A SENSOR DEVICE
Die vorliegende Erfindung betrifft eine Sensorvorrichtung zur induktiven Geschwindigkeitsmessung von Schaltkontakten elektromagnetischer Schaltgeräte gemäß dem Oberbegriff des Anspruchs 1 und ein elektromagnetisches Schaltgerät mit einer Sensorvorrichtung zur induktiven Geschwindigkeitsmessung gemäß Anspruch 7.The present invention relates to a sensor device for inductive speed measurement of switching contacts of electromagnetic switching devices according to the preamble of claim 1 and an electromagnetic switching device with a sensor device for inductive speed measurement according to claim 7.
Sensorvorrichtungen zur Messung von Geschwindigkeiten ortsveränderlicher Teile nutzen die Veränderung der Induktivität in einer Spule. Dafür wird insbesondere die Relativbewegung eines elektrischen Leiters in einem Magnetfeld genutzt. Nach diesem Prinzip arbeiten auch verschiedene Tachometer. Hierbei wird beispielsweise eine Spule innerhalb eines Magnetfeldes um eine Drehachse gedreht und auf diese Weise eine von der Winkelgeschwindigkeit der Spule abhängige Spannung induziert. Ferner ist aus der DE 41 07 292 C1 ein in einem Federbein angeordneter Sensor bekannt, der im wesentlichen aus einem ringförmigen, innerhalb des Federbein- Zylinderrohres ortsfest angeordneten Dauermagneten und einer um die Federbein- Kolbenstange angeordneten und somit innerhalb des Dauermagneten bewegbaren Sensorwicklung besteht. Derartige Sensoren haben sich in der Vergangenheit bereits bewährt, sind jedoch nur unzureichend oder mit entsprechend hohem Aufwand gegen elektromagnetische Streufelder geschützt.Sensor devices for measuring the speeds of movable parts use the change in inductance in a coil. For this purpose, the relative movement of an electrical conductor in a magnetic field is used in particular. Various tachometers work according to this principle. Here, for example, a coil is rotated about an axis of rotation within a magnetic field and in this way a voltage which is dependent on the angular velocity of the coil is induced. Furthermore, DE 41 07 292 C1 discloses a sensor arranged in a spring strut, which essentially consists of an annular permanent magnet arranged fixedly within the spring strut cylinder tube and a sensor winding arranged around the spring strut piston rod and thus movable within the permanent magnet. Such sensors have already proven themselves in the past, but are only insufficiently or with a correspondingly high cost protected against electromagnetic stray fields.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Sensorvorrichtung beziehungsweise ein Schaltgerät mit einer derartigen Sensorvorrichtung zu schaffen, wobei diese bei einfachstem Aufbau zuverlässig und möglichst verschleißarm arbeitet, magnetische Streufelder weitestgehend eliminiert und so stets eine genaue induktive Messung von ortsbeweglichen Teilen gewährleistet. Erfindungsgemäß wird die Aufgabe durch die kennzeichnenden Merkmale des Anspruchs 1 sowie durch die Merkmale des Anspruchs 7 gelöst. Die Sensorvorrichtung besteht im wesentlichen aus einer Meßspule und einem mit dieser zusammenwirkenden Dauermagneten. Erfindungsgemäß steht der Dauermagnet in Wirkverbindung mit dem oder jedem zu erfassenden Teil und ist derart angeordnet, daß er in der stationär angeordneten Meßspule longitudinal bewegbar ist. Ferner weist die Sensorvorrichtung erfindungsgemäß eine Kompensationsspule auf, die aufgrund ihrer räumlichen Anordnung in einem definierten Verhältnis gegebenenfalls auftretenden magnetischen Streufeldern ausgesetzt ist.The present invention has for its object to provide a sensor device or a switching device with such a sensor device, which works reliably and with as little wear as possible with the simplest structure, largely eliminates magnetic stray fields and thus always ensures an accurate inductive measurement of portable parts. According to the invention the object is achieved by the characterizing features of claim 1 and by the features of claim 7. The sensor device essentially consists of a measuring coil and a permanent magnet which interacts with it. According to the invention, the permanent magnet is in operative connection with the or each part to be detected and is arranged in such a way that it can be moved longitudinally in the stationary measuring coil. Furthermore, the sensor device according to the invention has a compensation coil which, due to its spatial arrangement, is exposed to magnetic stray fields that may occur in a defined ratio.
Das erfindungsgemäße elektromagnetische Schaltgerät weist einen symmetrisch aufgebauten Magnetantrieb auf, wobei Meß- und Kompensationsspule identische technische Daten aufweisen und derart symmetrisch angeordnet sind, daß sie zu gleichen Teilen den magnetischen Streufeldern des Magnetantriebs ausgesetzt sind. Indem nun die Signale von Meß- und Kompensationsspule einer gemeinsamenThe electromagnetic switching device according to the invention has a symmetrically constructed magnetic drive, the measuring and compensation coils having identical technical data and being arranged symmetrically such that they are equally exposed to the magnetic stray fields of the magnetic drive. By now the signals from the measuring and compensation coil of a common
Auswerteeinrichtung zugeführt und von dieser ausgewertet werden, wird zuverlässig der unerwünschte, verfälschende Einfluß der magnetischen Streufelder auf das Meßergebnis der Meßspule kompensiert. Weitere Vorteile der Erfindung sind in den Unteransprüchen und in der nachfolgenden Figurenbeschreibung enthalten. Es zeigen:If the evaluation device is fed in and evaluated by the latter, the undesirable, falsifying influence of the magnetic stray fields on the measurement result of the measuring coil is reliably compensated. Further advantages of the invention are contained in the subclaims and in the following description of the figures. Show it:
Fig.1 eine mögliche Ausführungsform der erfindungsgemäßen1 shows a possible embodiment of the invention
Sensorvorrichtung in schematischer Darstellung,Sensor device in a schematic representation,
Fig.2 eine schematische Darstellung eines Magnetantriebs für das erfindungsgemäße Schaltgerät in einer möglichen Ausführungsform (geöffneter Kontaktzustand), und2 shows a schematic representation of a magnetic drive for the switching device according to the invention in a possible embodiment (open contact state), and
Fig.3 eine schematische Darstellung des Magnetantriebs für das erfindungsgemäße Schaltgerät gemäß Fig. 2 (geschlossener3 shows a schematic representation of the magnetic drive for the switching device according to the invention according to FIG. 2 (closed
Kontaktzustand). In der Fig.1 ist die erfindungsgemäße Sensorvorrichtung zur induktiven Geschwindigkeitsmessung von longitudinal beweglichen Teilen in schematischer Weise dargestellt. Die Sensorvorrichtung besteht im wesentlichen aus einer Meßspule 4 sowie erfindungsgemäß mindestens einer Kompensationsspule 6. Die beiden Spulen 4, 6 sind in der Sensorvorrichtung stationär angeordnet, wobei der Meßspule 4 ein beweglicher, permanentmagnetischer Kern 8 in Form eines Dauermagneten zugeordnet ist. Bei der Bewegung der Schaltkontakte wird durch den in Wirkverbindung mit den Schaltkontakten stehenden und sich innerhalb der Meßspule 4 bewegenden Dauermagneten 8 eine geschwindigkeitsabhängigeContact status). 1 shows the sensor device according to the invention for inductive speed measurement of longitudinally movable parts in a schematic manner. The sensor device essentially consists of a measuring coil 4 and, according to the invention, at least one compensation coil 6. The two coils 4, 6 are arranged stationary in the sensor device, the measuring coil 4 being assigned a movable, permanent-magnetic core 8 in the form of a permanent magnet. During the movement of the switch contacts, the permanent magnet 8, which is in operative connection with the switch contacts and moves within the measuring coil 4, becomes a speed-dependent one
Spannung induziert. In einer bevorzugten Ausführung der Erfindung sind Meß- und Kompensationsspule 4, 6 im wesentlichen identisch ausgebildet (gleiche technische Daten) und beide Spulen 4, 6 bei entsprechender räumlicher Anordnung in gleichem Maße magnetischen Streufeldern ausgesetzt, so daß sie im Bezug auf die Streufelder identische Meßwerte liefern und somit eine problemlose Bereinigung der Meßwerte erfolgt. Hierfür sind Meß- und Kompensationsspule 4, 6 vorzugsweise mit entgegengesetztem Wicklungssinn elektrisch in Reihe geschaltet. Insbesondere bei unterschiedlicher Auslegung der Spulen 4, 6 ist es vorgesehen diese nicht in Reihe zu schalten sondern jede der Spulen 4, 6 mit ihren beiden Anschlüssen seperat an eine Auswerteeinheit 10 anzuschließen. Die Auswerteeinheit 10 besteht im dargestellten Ausführungsbeispiel vorzugsweise aus zwei Verstärkerschaltungen 12, 14, wobei die erste dieser Verstärkerschaltungen 12 insbesondere als Impedanzwandler ausgebildet ist. Die Schaltung 12 ist für die Realisierung und Funktion der Auswerteeinheit 10 jedoch nicht unbedingt notwendig und kann daher je nach Ausführungsform der Auswerteeinheit 10 auch weggelassen werden. Soll die Sensorvorrichtung als Beschleunigungs- oder Wegsensor Verwendung finden, so dient der Verstärker 12 als wirklicher Verstärker, um das Geschwindigkeitssignal 1 :v (v = Verstärkungsfaktor) abzubilden, wobei v so zu wählen ist, daß 1V (Volt) dann zum Beispiel 1 m/s (Meter pro Sekunde) entspricht. Der zweite Verstärker 14 dient dann je nach gewünschter Meßgröße als Integrierer oder Differenzierer, um aus dem Geschwindigkeitssignal das entsprechende Weg- oder Beschleunigungssignal zu erhalten. Durch den neben dem Dauermagneten 8 angeordneten Doppelpfeil soll lediglich angedeutet werden, daß es sich hierbei um ein in longitudinaler Richtung bewegliches Teil handelt. - Die er indungsgemäße Anordnung findet insbesondereAnwendung in gleichstrombetätigten elektromagnetischen Schaltgeräten, wie Schützen. Zur Auswertung der Meßsignale ist der Spulenanordnung 4, 6 noch die Auswerteeinrichtung 10 nachgeschaltet. Der Impedanzwandler 12 und die Verstärkerschaltung 14 verhindern einerseits den Einbruch der Spannung an der Meßspule 4, während die nachgeschaltete Verstärkerschaltung 14 die eigentliche Auswertung des Meßsignals, dessen Amplitude proportional zu der Geschwindigkeit der Schaltkontakte ist, vornimmt.Voltage induced. In a preferred embodiment of the invention, measuring and compensation coils 4, 6 are essentially identical (same technical data) and both coils 4, 6 are equally exposed to magnetic stray fields with a corresponding spatial arrangement, so that they have identical measured values with respect to the stray fields deliver and thus a problem-free adjustment of the measured values takes place. For this purpose, measuring and compensation coils 4, 6 are preferably electrically connected in series with the opposite winding sense. In particular when the coils 4, 6 are designed differently, provision is made not to connect them in series, but rather to connect each of the coils 4, 6 with their two connections separately to an evaluation unit 10. In the exemplary embodiment shown, the evaluation unit 10 preferably consists of two amplifier circuits 12, 14, the first of these amplifier circuits 12 being designed in particular as an impedance converter. However, the circuit 12 is not absolutely necessary for the implementation and function of the evaluation unit 10 and can therefore be omitted depending on the embodiment of the evaluation unit 10. If the sensor device is to be used as an acceleration or displacement sensor, the amplifier 12 serves as a real amplifier in order to represent the speed signal 1: v (v = gain factor), where v is to be selected such that 1 V (volt) then, for example, 1 m / s (meters per second). Depending on the desired measured variable, the second amplifier 14 then serves as an integrator or differentiator in order to use the speed signal to or get acceleration signal. The double arrow arranged next to the permanent magnet 8 is only intended to indicate that this is a part that can be moved in the longitudinal direction. - The arrangement according to the invention is used in particular in DC-operated electromagnetic switching devices, such as contactors. The evaluation device 10 is also connected downstream of the coil arrangement 4, 6 for evaluating the measurement signals. The impedance converter 12 and the amplifier circuit 14 prevent on the one hand the drop in the voltage at the measuring coil 4, while the downstream amplifier circuit 14 carries out the actual evaluation of the measuring signal, the amplitude of which is proportional to the speed of the switching contacts.
In den Fig. 2 und 3 ist ein Magnetantrieb 24 mit einer Kontaktträgereinrichtung 26 und einer induktiven Meßeinrichtung 28 eines erfindungsgemäßen elektromagnetischen Schaltgerätes in prinzipieller Darstellung gezeigt. Der Magnetantrieb 24 ist vorzugsweise symmetrisch ausgebildet und besteht im wesentlichen aus einem insbesondere E-förmigen Magnetkern 30, einer um den mittleren Schenkel des Magnetkerns 30 angeordneten Antriebsspule 32 und einem ebenfalls E-förmigen Magnetanker 34. Dabei ist am Magnetanker 34 im Bereich seines mittleren Schenkels auf seiner dem Magnetkern 30 abgekehrten Seite die Kontaktträgereinrichtung 26 angeordnet. Der Magnetkern 30 und der Magnetanker 34 können natürlich auch irgendeine andere Form, zum Beispiel eine U-Form oder dergleichen, aufweisen. In der in den Figuren 2 und 3 dargestellten Ausführungsform des erfindungsgemäßen Schaltgerätes weist die aus einem stabförmigen Element 36 und einem an diesem federnd gelagerten Kontaktelement 38 bestehende Kontaktträgereinrichtung 26 ferner noch die Meßeinrichtung 28 auf. Die Meßeinrichtung 28 ist magnetisch und elektrisch isoliert von der Kontaktträgereinrichtung 26 über ein Trägerelement 40 an dieser befestigt. Dabei besteht die Meßeinrichtung 28 im wesentlichen aus Meß- und Kompensationsspule 4, 6 sowie dem in der Meßspule 4 longitudinal beweglich geführten Dauermagneten 8. Der Dauermagnet 8 ist insbesondere derart auf dem Trägerelement 40 angeordnet, daß er sich im wesentlichen parallel zu dem stabförmigen Element 36 erstreckt. Zum Zwecke des Gewichtsausgleichs kann diametral dem Dauermagneten 8 gegenüberliegend ein Gewichtselement angeordnet sein. In der bevorzugten Ausführungsform der Erfindung weisen Meß- und Kompensationsspule 4, 6 im wesentlichen identische technische Daten auf und sind derart räumlich angeordnet, daß sie stets zu gleichen Teilen dem Einfluß von magnetischen Streufeldern ausgesetzt sind und im Bezug auf diese im wesentlichen identische Signale liefern, so daß der Streufeldeinfluß in der Auswerteeinrichtung 18 berücksichtigt und das Meßergebnis entsprechend bereinigt wird. Die Erfindung ist nicht auf die beschriebenen und dargestellten Ausführungsbeispiele beschränkt, sondern umfaßt alle im Sinne der Erfindung gleichwirkenden Ausführungsformen. So ist zum Beispiel auch eine Ausführungsform der Sensorvorrichtung oder des Schaltgerätes denkbar, in der die Meßspule 4 und die Kompensationsspule 6 unterschiedlich ausgelegt und in unterschiedlich starken magnetischen Streufeldern positioniert sind. 2 and 3, a magnetic drive 24 with a contact carrier device 26 and an inductive measuring device 28 of an electromagnetic switching device according to the invention is shown in a basic representation. The magnet drive 24 is preferably symmetrical and essentially consists of an in particular E-shaped magnet core 30, a drive coil 32 arranged around the middle leg of the magnet core 30 and an E-shaped magnet armature 34. The magnet armature 34 is located in the area of its middle leg the contact carrier device 26 is arranged on its side facing away from the magnetic core 30. The magnetic core 30 and the magnet armature 34 can of course also have any other shape, for example a U-shape or the like. In the embodiment of the switching device according to the invention shown in FIGS. 2 and 3, the contact carrier device 26, which consists of a rod-shaped element 36 and a contact element 38 resiliently mounted thereon, also has the measuring device 28. The measuring device 28 is magnetically and electrically insulated from the contact carrier device 26 by means of a carrier element 40. The measuring device 28 essentially consists of measuring and compensation coils 4, 6 and the permanent magnet 8 which is guided longitudinally movably in the measuring coil 4. The permanent magnet 8 is in particular on the carrier element 40 in this way arranged so that it extends substantially parallel to the rod-shaped element 36. For the purpose of weight compensation, a weight element can be arranged diametrically opposite the permanent magnet 8. In the preferred embodiment of the invention, measuring and compensation coils 4, 6 have essentially identical technical data and are arranged spatially in such a way that they are always equally exposed to the influence of magnetic stray fields and provide essentially identical signals with respect to them. so that the stray field influence in the evaluation device 18 is taken into account and the measurement result is adjusted accordingly. The invention is not limited to the exemplary embodiments described and illustrated, but encompasses all the embodiments having the same effect in the sense of the invention. For example, an embodiment of the sensor device or the switching device is also conceivable in which the measuring coil 4 and the compensation coil 6 are designed differently and are positioned in different magnetic stray fields.

Claims

Patentansprücheclaims
Sensorvorrichtung zur induktiven Geschwindigkeitsmessung longitudinal beweglicher Teile, mit mindestens einer Meßspule (4) und einem mit dieser zusammenwirkenden Dauermagneten (8), dadurch gekennzeichnet,Sensor device for inductive speed measurement of longitudinally moving parts, with at least one measuring coil (4) and a permanent magnet (8) interacting with it, characterized in that
- daß der Dauermagnet (8) in Wirkverbindung mit dem oder jedem zu erfassenden Teil steht und derart angeordnet ist, daß er in der stationär angeordneten Meßspule (4) bewegbar ist, und- That the permanent magnet (8) is in operative connection with the or each part to be detected and is arranged such that it is movable in the stationary measuring coil (4), and
- daß eine Kompensationsspule (6) vorhanden ist, die aufgrund ihrer räumlichen Anordnung in einem definierten Maße gegebenenfalls auftretenden magnetischen Streufeldern ausgesetzt ist.- That a compensation coil (6) is present, which due to its spatial arrangement is exposed to a defined extent to any magnetic stray fields that may occur.
Sensorvorrichtung nach Anspruch 1 , dadurch gekennzeichnet, daß Meß- und Kompensationsspule (4, 6) als stationäre Teile der Sensorvorrichtung ausgebildet sind.Sensor device according to claim 1, characterized in that the measuring and compensation coil (4, 6) are designed as stationary parts of the sensor device.
Sensorvorrichtung nach der Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Magnetantrieb (24) einen symmetrischen Aufbau aufweist, Meß- und Kompensationsspule (4, 6) derart aufgebaut sind, daß sie die gleichen technischen Daten aufweisen und Meß- und Kompensationsspule (4, 6) derart angeordnet sind, daß sie in gleichem Maße gegebenenfalls auftretenden magnetischen Feldern ausgesetzt sind.Sensor device according to claim 1 or 2, characterized in that the magnetic drive (24) has a symmetrical structure, measuring and compensation coils (4, 6) are constructed in such a way that they have the same technical data and measuring and compensation coil (4, 6) are arranged in such a way that they are equally exposed to any magnetic fields that may occur.
Sensorvorrichtung nach einem der Ansprüche 1-3, gekennzeichnet durch eine Auswerteeinrichtung (10) der die elektrischenSensor device according to one of claims 1-3, characterized by an evaluation device (10) that the electrical
Signale von Meß- und Kompensationsspule (4, 6) zugeführt werden. Sensorvorrichtung nach einem der Ansprüche 1-4, gekennzeichnet durch einen der Auswerteeinrichtung (10) vorgeschaltetenSignals from the measuring and compensation coil (4, 6) are supplied. Sensor device according to one of claims 1-4, characterized by one upstream of the evaluation device (10)
Impedanzwandler (17).Impedance converter (17).
Elektromagnetisches Schaltgerät mit einer Sensorvorrichtung zur induktiven Geschwindigkeitsmessung von Schaltkontakten, - mit einem symmetrisch aufgebauten Magnetantrieb (24),Electromagnetic switching device with a sensor device for inductive speed measurement of switch contacts, - with a symmetrically designed magnetic drive (24),
- einer an dem Magnetanker (34) des Magnetantriebs (24) befestigten Kontaktträgereinrichtung (26),- a contact carrier device (26) attached to the magnet armature (34) of the magnet drive (24),
- wobei die Kontaktträgereinrichtung (26) mit einem zumindest bereichsweise als Dauermagnet (8) ausgebildeten Kern verbunden ist, - in dem Schaltgerät mindestens eine Meß- und eine Kompensationsspule (4,- wherein the contact carrier device (26) is connected to a core which is at least partially formed as a permanent magnet (8), - in the switching device at least one measuring and one compensation coil (4,
6) angeordnet sind, und6) are arranged, and
- die Meßspule (4) veränderlich, in Abhängigkeit von der Bewegung der Schaltkontakte, bereichsweise von dem Kern durchdrungen ist.- The measuring coil (4) is variable, depending on the movement of the switch contacts, partially penetrated by the core.
Schaltgerät nach Anspruch 6, dadurch gekennzeichnet, daß Meß- und Kompensationsspule (4, 6) als stationäre Teile der Sensorvorrichtung ausgebildet sind.Switching device according to claim 6, characterized in that the measuring and compensation coil (4, 6) are designed as stationary parts of the sensor device.
8.8th.
Schaltgerät nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß der Magnetantrieb (24) einen symmetrischen Aufbau aufweist, Meß- und Kompensationsspule (4, 6) derart aufgebaut sind, daß sie die gleichen technischen Daten aufweisen und Meß- und Kompensationsspule (4, 6) derart angeordnet sind, daß sie in gleichem Maße gegebenenfalls auftretenden magnetischen Feldern ausgesetzt sind. Switching device according to claim 6 or 7, characterized in that the magnetic drive (24) has a symmetrical structure, measuring and compensation coils (4, 6) are constructed in such a way that they have the same technical data and measuring and compensation coil (4, 6 ) are arranged in such a way that they are equally exposed to any magnetic fields that may occur.
9.9th
Schaltgerät nach einem der Ansprüche 6-8, gekennzeichnet durch eine Auswerteeinrichtung (10) der zumindest die elektrischen Signale von Meß- und Kompensationsspule (4, 6) zugeführt werden.Switching device according to one of Claims 6-8, characterized by an evaluation device (10) to which at least the electrical signals from the measuring and compensation coil (4, 6) are supplied.
10.10th
Schaltgerät nach einem der Ansprüche 6-9, gekennzeichnet durch einen der Auswerteeinrichtung (10) vorgeschaltetenSwitching device according to one of claims 6-9, characterized by one upstream of the evaluation device (10)
Impedanzwandler. Impedance converter.
PCT/DE1998/000993 1997-04-21 1998-04-08 Sensor device for inductive speed measurement of longitudinally mobile elements and electromagnetic switchgear with such sensor device WO1998048285A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19716608.3 1997-04-21
DE1997116608 DE19716608A1 (en) 1997-04-21 1997-04-21 Sensor device for inductive speed measurement of longitudinally moving parts and electromagnetic switching device with a sensor device for inductive speed measurement

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3816776A (en) * 1972-12-04 1974-06-11 Control Data Corp External magnetic field compensator
US4901015A (en) * 1988-09-21 1990-02-13 Sundstrand Corporation Ambient electromagnetic field compensating magnetic pick-up circuit for integrated drive generators
DE4123120A1 (en) * 1991-07-12 1993-01-21 Abb Patent Gmbh HV switch contact speed measuring appts. - has magnetic transmitter magnetising component, receiver detecting magnetised region and signal comparator deriving acceleration and hence speed
US5233293A (en) * 1990-11-17 1993-08-03 August Bilstein Gmbh & Co. Kg Sensor for measuring the speed and/or position of a piston in relation to that of the cylinder it moves inside of in a dashpot or shock absorber

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3816776A (en) * 1972-12-04 1974-06-11 Control Data Corp External magnetic field compensator
US4901015A (en) * 1988-09-21 1990-02-13 Sundstrand Corporation Ambient electromagnetic field compensating magnetic pick-up circuit for integrated drive generators
US5233293A (en) * 1990-11-17 1993-08-03 August Bilstein Gmbh & Co. Kg Sensor for measuring the speed and/or position of a piston in relation to that of the cylinder it moves inside of in a dashpot or shock absorber
DE4123120A1 (en) * 1991-07-12 1993-01-21 Abb Patent Gmbh HV switch contact speed measuring appts. - has magnetic transmitter magnetising component, receiver detecting magnetised region and signal comparator deriving acceleration and hence speed

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