EP1302952B1 - Process and circuit for the detection of the position of the armature of an electromagnet - Google Patents

Process and circuit for the detection of the position of the armature of an electromagnet Download PDF

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Publication number
EP1302952B1
EP1302952B1 EP02022489.5A EP02022489A EP1302952B1 EP 1302952 B1 EP1302952 B1 EP 1302952B1 EP 02022489 A EP02022489 A EP 02022489A EP 1302952 B1 EP1302952 B1 EP 1302952B1
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Prior art keywords
voltage
magnet
reference voltage
comparator
electrical circuit
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EP02022489.5A
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German (de)
French (fr)
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EP1302952A2 (en
EP1302952A3 (en
Inventor
Wolfgang E. Dipl.-Ing. Schultz
Dieter Dipl.-Ing. Kleinert
Peter Dr.-Ing. Tappe
Jürgen Dipl.-Ing. Heinzmann
Horst-Peter Dipl.-Ing. Wassermann
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1844—Monitoring or fail-safe circuits

Definitions

  • the invention relates to a method for detecting the armature position of an electromagnet, wherein from the magnetic coil flowing through the coil, a magnetic voltage is generated and this magnetic voltage is compared with a reference voltage and a corresponding anchor position is determined by this comparison. Furthermore, the invention also relates to a circuit for detecting the armature position of an electromagnet, wherein the magnetic current flowing through the coil at a resistor leads to a magnetic voltage and this with a Reference voltage is compared in the comparator, wherein at the output of the comparator, a corresponding output signal can be tapped when in the comparator the corresponding comparison condition of magnetic voltage and reference voltage.
  • Electromagnets are widely used in the art. They are known, for example, as actuators for hydraulic valves and so on. There are a variety of applications where it is important to ensure that the armature has attracted, that is, that the armature has reached its end position. In a current-time diagram, this gives a characteristic course, as it is, for example, in Fig. 2 (instead of the current can serve the magnetic tension) is indicated.
  • the magnetic current is converted into a current-proportional voltage and the converted voltage is differentiated.
  • This differentiated magnet voltage is compared with a threshold value. This threshold is averaged from the differentiated magnet voltage.
  • a disadvantage of the method known in the prior art is the relatively high number of assemblies.
  • the magnet voltage must first be differentiated, in which case a reference voltage is obtained from the differentiated magnet voltage by averaging.
  • a reference voltage is obtained from the differentiated magnet voltage by averaging.
  • the invention has set itself the task of a method or to provide a circuit for detecting the armature position of an electromagnet available, on the one hand works reliably and on the other hand is not as expensive as the solutions of the prior art.
  • the characteristic current or voltage curve over time for the movement of an armature of an electromagnet is divided into three parts.
  • the current flowing through the coil breaks down when the armature reaches the end position, ie "switches".
  • the current increases again to reach the holding current. Since it is easier to electronically compare voltages with one another than currents, the following is generally spoken of magnet voltage or reference voltage, without wishing to restrict the invention to this.
  • the interposition of a resistor allows the simple conversion of a variable current into a variable voltage, according to Ohm's law. Since the magnet voltage overshoots a maximum in the course of time before reaching the anchor end position, an intersection point can be generated when the flattening of the reference voltage is chosen, which is used as a signal for reaching the armature in the end position.
  • the untreated or only slightly treated magnet voltage is compared with a filtered or flattened magnet voltage as the reference voltage. Since the circuit thus designed is not so expensive, it is also much less susceptible to interference and also inexpensive to produce.
  • the presented inventive concept of a dynamic limit curve method also allows the independence of the method of temperature influences or magnet types, since the reference voltage is not constant but derived in relation to the magnetic voltage to be monitored from this.
  • a flattened magnetic voltage is proposed according to the invention.
  • the flattening can be achieved, for example, by the use of a low-pass filter as a filter.
  • the use of the low-pass filter cuts off the high-frequency components of the magnetic field voltage.
  • the filtered signal reacts slower than the source signal (magnetic voltage).
  • the reference voltage intersects the magnet voltage (over time).
  • the undershooting of the reference voltage can be read out by the subsequent electronics (for example a comparator) and used for corresponding evaluation purposes (optical signal, process monitoring and so on).
  • a voltage divider can be provided in order to achieve a corresponding lowering of the level of the reference voltage below the magnet voltage.
  • the known circuit uses a comparator.
  • the invention is shown schematically in the circuit arrangement according to the Fig. 1 explained.
  • the input voltage U is applied to the magnet. 1
  • the current flowing through the magnet 1 leads to a voltage drop across the shunt resistor 2. This voltage drop is referred to below as magnet voltage U M.
  • a reference voltage U R is now generated by the magnet voltage U M.
  • the filter 3 is embodied here as a low-pass filter and / or voltage divider and generates the reference voltage U R.
  • the magnet voltage U M and the reference voltage U R is applied to the comparator 4 to different inputs.
  • the comparator 4 now compares the two characteristic curves U M and U R.
  • the comparator 4 can be conveniently designed as an operational amplifier. According to the dimensioning of the filter, the two characteristics intersect only at the switch-on peak, which means when the armature reaches its end position.
  • a holding member 7 and a reset 6 is provided.
  • a voltage stabilization 5 the comparator 4 and the reset 6 is supplied.
  • Fig. 2 For example, the solution according to the prior art, in particular the gradient method, is shown.
  • the current breaks down due to the mutual induction and the armature runs into its end position.
  • the switching time ie the time at which the armature reaches its end position, is marked with A.
  • a current (and thus voltage) increase takes place until the holding current.
  • U M the voltage curve U B is indicated when the armature blocks. It is noticeable that the voltage drop, in particular in the time interval II in the voltage curve U B is not present and thus there is a characteristic difference.
  • Fig. 3 The solution according to the invention is in Fig. 3 shown.
  • Fig. 1 is derived from the magnetic voltage U M, a reference voltage U R.
  • the time interval B is limited by the two points of intersection B 1 and B 2 of the reference voltage U R with the magnet voltage U M. Within the time segment B, the reference voltage U R is greater than the magnet voltage U M.
  • the point in time A which characterizes the switching state or the reaching of the armature end position, is within the time interval B.
  • the proposal according to the invention provides a reliable method for detecting the end position of the armature which functions reliably independently of external influences.
  • the output signal U out is present at the output.
  • This output signal can be displayed optically, for example by an LED is provided. It is also possible for the output signal U from one of the electromagnets supervising monitoring control, which processes the signal according to digital or analog.

Description

Die Erfindung betrifft ein Verfahren zur Erkennung der Ankerlage eines Elektromagneten, wobei von dem die Spule durchfließenden Magnetstrom eine Magnetspannung erzeugt wird und diese Magnetspannung mit einer Referenzspannung verglichen wird und durch diesen Vergleich eine entsprechende Ankerlage festgestellt wird. Des Weiteren betrifft die Erfindung auch eine Schaltung zur Erkennung der Ankerlage eines Elektromagneten, wobei der durch die Spule fließende Magnetstrom an einem Widerstand zu einer Magnetspannung führt und diese mit einer Referenzspannung in dem Komparator verglichen wird, wobei an dem Ausgang des Komparators ein entsprechendes Ausgangssignal abgreifbar ist, wenn in dem Komparator die entsprechende Vergleichsbedingung von Magnetspannung und Referenzspannung besteht.The invention relates to a method for detecting the armature position of an electromagnet, wherein from the magnetic coil flowing through the coil, a magnetic voltage is generated and this magnetic voltage is compared with a reference voltage and a corresponding anchor position is determined by this comparison. Furthermore, the invention also relates to a circuit for detecting the armature position of an electromagnet, wherein the magnetic current flowing through the coil at a resistor leads to a magnetic voltage and this with a Reference voltage is compared in the comparator, wherein at the output of the comparator, a corresponding output signal can be tapped when in the comparator the corresponding comparison condition of magnetic voltage and reference voltage.

Elektromagneten werden in der Technik in weiten Bereichen eingesetzt. Sie sind zum Beispiel als Stellglieder für Hydraulikventile und so weiter bekannt. Es gibt eine Vielzahl von Anwendungen, bei denen es wichtig ist, sicherzustellen, daß der Anker angezogen hat, das heißt, daß der Anker in seiner Endlage angekommen ist. In einem Strom-Zeit-Diagramm gibt dies einen charakteristischen Verlauf, wie er zum Beispiel in Fig. 2 (anstelle des Stromes kann die Magnetspannung dienen) angedeutet ist.Electromagnets are widely used in the art. They are known, for example, as actuators for hydraulic valves and so on. There are a variety of applications where it is important to ensure that the armature has attracted, that is, that the armature has reached its end position. In a current-time diagram, this gives a characteristic course, as it is, for example, in Fig. 2 (instead of the current can serve the magnetic tension) is indicated.

Hierzu ist im Stand der Technik insbesondere die deutsche Patentanmeldung 197 33 138 bekannt. Nach der hier vorgestellten Lösung wird der Magnetstrom in eine stromproportionale Spannung umgewandelt und die umgewandelte Spannung differenziert. Diese differenzierte Magnetspannung wird mit einem Schwellenwert verglichen. Dieser Schwellenwert wird aus der differenzierten Magnetspannung gemittelt.For this purpose, in the prior art, in particular the German patent application 197 33 138 known. According to the solution presented here, the magnetic current is converted into a current-proportional voltage and the converted voltage is differentiated. This differentiated magnet voltage is compared with a threshold value. This threshold is averaged from the differentiated magnet voltage.

Nachteilig bei dem im obigen Stand der Technik bekannten Verfahren ist die verhältnismäßig hohe Anzahl von Baugruppen. Die Magnetspannung muß zuerst differenziert werden, wobei dann erst von der differenzierten Magnetspannung eine Referenzspannung durch Mittelung gewonnen wird. Neben der erhöhten Ausfallwahrscheinlichkeit aufgrund der größeren Anzahl von Bauteilen besteht auch bei dieser Verfahrensweise die Gefahr einer Verfälschung des Ergebnisses, da die abgegriffene Spannung mehrfach durch die Baugruppen verändert wird.A disadvantage of the method known in the prior art is the relatively high number of assemblies. The magnet voltage must first be differentiated, in which case a reference voltage is obtained from the differentiated magnet voltage by averaging. In addition to the increased probability of failure due to the larger number of components, there is also the risk of falsification of the result in this procedure, since the tapped voltage is changed several times by the modules.

Die Erfindung hat es sich zur Aufgabe gemacht, ein Verfahren beziehungsweise eine Schaltung zur Erkennung der Ankerlage eines Elektromagneten zur Verfügung zu stellen, das zum einen zuverlässig funktioniert und zum anderen nicht so aufwendig ist, wie die Lösungen des Standes der Technik.The invention has set itself the task of a method or to provide a circuit for detecting the armature position of an electromagnet available, on the one hand works reliably and on the other hand is not as expensive as the solutions of the prior art.

Gelöst wird diese Aufgabe durch ein Verfahren gemäß Anspruch 1 und eine Schaltung gemäß Anspruch 5.This object is achieved by a method according to claim 1 and a circuit according to claim 5.

Der charakteristische Strom- beziehungsweise Spannungsverlauf über der Zeit für die Bewegung eines Ankers eines Elektromagneten ist in drei Teile aufgeteilt. Der durch die Spule fließende Strom bricht ein, wenn der Anker in die Endlage gelangt also "schaltet". Erreicht der Anker dann seine Endlage, so steigt der Strom wieder an, um den Haltestrom zu erreichen. Da es elektronisch leichter ist, Spannungen miteinander zu vergleichen als Ströme, wird nachfolgend in der Regel von Magnetspannung beziehungsweise Referenzspannung gesprochen, ohne die Erfindung hierauf beschränken zu wollen. Dabei erlaubt die Zwischenschaltung eines Widerstandes die einfache Umsetzung eines variablen Stromes in eine variable Spannung, gemäß dem Ohmschen Gesetz. Da die Magnetspannung im zeitlichen Verlauf vor Erreichen der Ankerendlage ein Maximum überschreitet, kann bei ensprechender Wahl der Abflachung der Referenzspannung ein Schnittpunkt erzeugt werden, der als Signal für das Erreichen des Ankers in der Endlage eingesetzt wird.The characteristic current or voltage curve over time for the movement of an armature of an electromagnet is divided into three parts. The current flowing through the coil breaks down when the armature reaches the end position, ie "switches". When the armature reaches its end position, the current increases again to reach the holding current. Since it is easier to electronically compare voltages with one another than currents, the following is generally spoken of magnet voltage or reference voltage, without wishing to restrict the invention to this. The interposition of a resistor allows the simple conversion of a variable current into a variable voltage, according to Ohm's law. Since the magnet voltage overshoots a maximum in the course of time before reaching the anchor end position, an intersection point can be generated when the flattening of the reference voltage is chosen, which is used as a signal for reaching the armature in the end position.

Im Gegensatz zu der Lösung nach dem Stand der Technik deutsche Patentanmeldung 19733138 wird nach dem erfindungsgemäßen Vorschlag die unbehandelte oder nur geringfügig behandelte Magnetspannung verglichen mit einer gefilterten beziehungsweise abgeflachten Magnetspannung als Referenzspannung. Da die so ausgestaltete Schaltung nicht so aufwendig ist, ist sie auch deutlich weniger störanfällig und auch kostengünstig herstellbar. Das vorgelegte erfindungsgemäße Konzept eines dynamischen Grenzkurvenverfahrens erlaubt auch die Unabhängigkeit des Verfahrens von Temperatureinflüssen oder Magnettypen, da die Referenzspannung nicht konstant sondern im verhältnis zur zu überwachenden Magnetspannung von dieser abgeleitet ist.In contrast to the solution according to the prior art German patent application 19733138 According to the proposal of the invention, the untreated or only slightly treated magnet voltage is compared with a filtered or flattened magnet voltage as the reference voltage. Since the circuit thus designed is not so expensive, it is also much less susceptible to interference and also inexpensive to produce. The presented inventive concept of a dynamic limit curve method also allows the independence of the method of temperature influences or magnet types, since the reference voltage is not constant but derived in relation to the magnetic voltage to be monitored from this.

Als Referenzspannung wird eine abgeflachte Magnetspannung erfindungsgemäß vorgeschlagen. Die Abflachung kann zum Beispiel durch den Einsatz eines Tiefpaßfilters als Filter erreicht werden. Der Einsatz des Tiefpaßfilters schneidet die hochfrequenten Anteile der Magnetfeldspannung ab. Das so gefilterte Signal reagiert träger als das Quellsignal (Magnetspannung). Bei einem kurzfristigen Absinken der Magnetspannung schneidet (im zeitlichen Verlauf) die Referenzspannung die Magnetspannung. Das Unterschreiten der Referenzspannung kann durch die nachfolgende Elektronik (zum Beispiel ein Komparator) ausgelesen werden und für entsprechende Auswertungszwecke (optisches Signal, Prozessüberwachung und so weiter) verwendet werden. Ergänzend hierzu kann ein Spannungsteiler vorgesehen werden, um eine entsprechende Absenkung des Niveaus der Referenzspannung unter die Magnetspannung zu erreichen.As a reference voltage, a flattened magnetic voltage is proposed according to the invention. The flattening can be achieved, for example, by the use of a low-pass filter as a filter. The use of the low-pass filter cuts off the high-frequency components of the magnetic field voltage. The filtered signal reacts slower than the source signal (magnetic voltage). In the case of a short-term decrease in the magnet voltage, the reference voltage intersects the magnet voltage (over time). The undershooting of the reference voltage can be read out by the subsequent electronics (for example a comparator) and used for corresponding evaluation purposes (optical signal, process monitoring and so on). In addition to this, a voltage divider can be provided in order to achieve a corresponding lowering of the level of the reference voltage below the magnet voltage.

Aus der DE-U-8714942 ist ein Verfahren gemäß Oberbegriff des Anspruchs 1 bekannt. Die bekannte Schaltung verwendet einen Komparator.From the DE-U-8714942 a method according to the preamble of claim 1 is known. The known circuit uses a comparator.

Die Erfindung wird schematisch in der Zeichnung erläutert. Es zeigen:

Fig. 1
die erfindungsgemäße Schaltung als Blockschaltbild;
Fig. 2
ein U-t-Diagramm des Verlaufes der Magnetspannung unter Referenzspannung nach dem Stande der Technik und
Fig. 3
ein U-t-Diagramm der Magnetspannung gemäß der Erfindung.
The invention will be explained schematically in the drawing. Show it:
Fig. 1
the circuit according to the invention as a block diagram;
Fig. 2
a Ut diagram of the course of the magnet voltage under reference voltage according to the prior art and
Fig. 3
an Ut diagram of the magnet voltage according to the invention.

Die Erfindung wird schematisch an der Schaltungsanordnung gemäß der Fig. 1 erläutert. Die Eingangsspannung Uein liegt an dem Magneten 1 an. Der durch den Magneten 1 fließende Strom führt zu einem Spannungsabfall an dem Shuntwiderstand 2. Dieser Spannungsabfall wird nachfolgend als Magnetspannung UM bezeichnet.The invention is shown schematically in the circuit arrangement according to the Fig. 1 explained. The input voltage U is applied to the magnet. 1 The current flowing through the magnet 1 leads to a voltage drop across the shunt resistor 2. This voltage drop is referred to below as magnet voltage U M.

Indem ein Filter 3 vorgesehen ist, wird nun erfindungsgemäß von der Magnetspannung UM eine Referenzspannung UR erzeugt, Der Filter 3 ist hierbei als Tiefpassfilter und/oder Spannungsteiler ausgebildet und erzeugt die Referenzspannung UR. Die Magnetspannung UM und die Referenzspannung UR wird auf den Komparator 4 an unterschiedliche Eingänge gelegt. Der Komparator 4 vergleicht nun die beiden Kennlinien UM und UR. Der Komparator 4 kann hierbei günstigerweise als Operationsverstärker ausgebildet sein. Entsprechend der Dimensionierung des Filters schneiden sich die beiden Kennlinien nur beim Einschaltpeak, das bedeutet, wenn der Anker seine Endlage erreicht.By providing a filter 3, according to the invention, a reference voltage U R is now generated by the magnet voltage U M. The filter 3 is embodied here as a low-pass filter and / or voltage divider and generates the reference voltage U R. The magnet voltage U M and the reference voltage U R is applied to the comparator 4 to different inputs. The comparator 4 now compares the two characteristic curves U M and U R. The comparator 4 can be conveniently designed as an operational amplifier. According to the dimensioning of the filter, the two characteristics intersect only at the switch-on peak, which means when the armature reaches its end position.

Um das Signal über den Einschaltzeitraum des Magneten 1 zu halten, ist ein Halteglied 7 und ein Reset 6 vorgesehen. Durch eine Spannungsstabilisierung 5 wird der Komparator 4 und der Reset 6 versorgt.In order to hold the signal over the switch-on of the magnet 1, a holding member 7 and a reset 6 is provided. By a voltage stabilization 5, the comparator 4 and the reset 6 is supplied.

Im Vergleich der Graphen nach Fig. 2 und Fig. 3 wird der erfindungsgemäße Effekt deutlich.Comparing the graphs after Fig. 2 and Fig. 3 the effect of the invention becomes clear.

In Fig. 2, 3 sind Spannungs-Zeit-Diagramme gezeigt.In Fig. 2, 3rd Voltage-time diagrams are shown.

In Fig. 2 ist die Lösung nach dem Stand der Technik insbesondere das Gradientenverfahren gezeigt.In Fig. 2 For example, the solution according to the prior art, in particular the gradient method, is shown.

Im Zeitsegment I wird der Anker beschleunigt, der Strom steigt an, dadurch steigt auch die am Shuntwiderstand abgegriffene Spannung an. Gleichzeitig nimmt die Gegeninduktion zu.In the time segment I, the armature is accelerated, the current increases, thereby increasing the tapped at the shunt resistor voltage. At the same time the counterinduction increases.

Im Zeitintervall II bricht der Strom (und somit auch die Spannung) aufgrund der Gegeninduktion ein und der Anker läuft in seine Endlage ein. Der Schaltzeitpunkt, also der Zeitpunkt in welchem der Anker seine Endlage erreicht, ist mit A gekennzeichnet. Im Zeitintervall III erfolgt wiederum ein Strom- (und somit Spannungs-)anstieg bis zum Haltestrom. Im Gegensatz zu diesem durch UM gekennzeichneten Verlauf wird der Spannungsverlauf UB angedeutet, wenn der Anker blockiert. Auffällig ist, daß der Spannungsabfall insbesondere im Zeitintervall II bei dem Spannungsverlauf UB nicht vorliegt und somit ein charakteristischer Unterschied besteht.In the time interval II, the current (and thus also the voltage) breaks down due to the mutual induction and the armature runs into its end position. The switching time, ie the time at which the armature reaches its end position, is marked with A. In the time interval III again a current (and thus voltage) increase takes place until the holding current. In contrast to this course marked by U M , the voltage curve U B is indicated when the armature blocks. It is noticeable that the voltage drop, in particular in the time interval II in the voltage curve U B is not present and thus there is a characteristic difference.

Mit dUM/dt ist die Ableitung der Magnetspannung angedeutet. Diese Ableitung ist negativ in dem Zeitintervall II. Dieses Signal wird nach dem verhältnismäßig komplizierten Lösung des Standes der Technik ausgenützt.With dU M / dt the derivative of the magnet voltage is indicated. This derivative is negative in the time interval II. This signal is exploited according to the relatively complicated solution of the prior art.

Die erfindungsgemäße Lösung ist in Fig. 3 gezeigt. Entsprechend der erfindungsgemäßen Schaltungsanordnung nach Fig. 1 wird von der Magnetspannung UM eine Referenzspannung UR abgeleitet. Das Zeitintervall B wird begrenzt durch die beiden Schnittpunkte B1 und B2 der Referenzspannung UR mit der Magnetspannung UM. Innerhalb des Zeitsegmentes B ist die Referenzspannung UR größer als die Magnetspannung UM. Der Zeitpunkt A, der den Schaltzustand beziehungsweise das Erreichen der Ankerendlage kennzeichnet befindet sich innerhalb des Zeitintervalles B. Durch den erfindungsgemäßen Vorschlag wird ein sicheres Verfahren zur Erkennung der Endlage des Ankers zur Verfügung gestellt, das unabhängig von äußeren Einflüssen zuverlässig funktioniert.The solution according to the invention is in Fig. 3 shown. According to the circuit arrangement according to the invention Fig. 1 is derived from the magnetic voltage U M, a reference voltage U R. The time interval B is limited by the two points of intersection B 1 and B 2 of the reference voltage U R with the magnet voltage U M. Within the time segment B, the reference voltage U R is greater than the magnet voltage U M. The point in time A, which characterizes the switching state or the reaching of the armature end position, is within the time interval B. The proposal according to the invention provides a reliable method for detecting the end position of the armature which functions reliably independently of external influences.

Innerhalb des Zeitintervalles B liegt an dem Ausgang das Ausgangssignal Uaus an. Dieses Ausgangssignal kann dabei optisch angezeigt werden, indem zum Beispiel eine LED vorgesehen ist. Es ist auch möglich, das Ausgangssignal Uaus einer den Elektromagneten überwachenden Überwachungssteuerung zuzuleiten, die das Signal entsprechend digital oder analog weiterverarbeitet.Within the time interval B, the output signal U out is present at the output. This output signal can be displayed optically, for example by an LED is provided. It is also possible for the output signal U from one of the electromagnets supervising monitoring control, which processes the signal according to digital or analog.

Die jetzt mit der Anmeldung und später eingereichten Ansprüche sind Versuche zur Formulierung ohne Präjudiz für die Erzielung weitergehenden Schutzes.The claims now filed with the application and later are attempts to formulate without prejudice to the attainment of further protection.

Die in den abhängigen Ansprüchen angeführten Rückbeziehungen weisen auf die weitere Ausbildung des Gegenstandes des Hauptanspruches durch die Merkmale des jeweiligen Unteranspruches hin. Jedoch sind diese nicht als ein Verzicht auf die Erzielung eines selbständigen, gegenständlichen Schutzes für die Merkmale der rückbezogenen Unteransprüche zu verstehen.The references cited in the dependent claims indicate the further development of the subject matter of the main claim by the features of the respective subclaim. However, these are not to be understood as a waiver of obtaining independent, objective protection for the features of the dependent claims.

Merkmale, die bislang nur in der Beschreibung offenbart wurden, können im Laufe des Verfahrens als von erfindungswesentlicher Bedeutung, zum Beispiel zur Abgrenzung vom Stand der Technik beansprucht werden.Features that have hitherto been disclosed only in the description may be claimed in the course of the method as of essential importance to the invention, for example to distinguish from the prior art.

Claims (9)

  1. Procedure to determine the position of the core of an electromagnet using a technique comparing the magnet voltage produced by a current flowing through the electromagnet coil and a reference voltage and the possibility to determine the core position through this comparison whereas the reference voltage is derived from the magnet voltage and is filtered and eventually smoothened, characterized in that the crossing point of the curves of the reference voltage and the magnet voltage is used as a trigger or as a signal related to the core position whereas a time interval (B) is defined between two crossings (B1, B2) of the reference voltage and the magnet voltage with a moment (A), signifying that the core reached its end position, situated within this time interval (B).
  2. Procedure according to claim 1, characterized in that the reference voltage is derived from the magnet voltage by a filter like a low-pass filter.
  3. Procedure according to on or both preceding claims, characterized in that the reference voltage is derived from the magnet voltage by a voltage divider.
  4. Procedure according to any of the preceding claims, characterized in that the magnet voltage is compared to the reference voltage with no or light modification.
  5. Electrical circuit to determine the position of the core of an electromagnet whereas the magnet current flowing through the magnet coil also flows through a resistor and produces a magnet voltage which is compared to a reference voltage within a comparator which delivers at its output a measurable output signal if inside the comparator the corresponding comparative conditions between the magnet voltage and the reference voltage are fulfilled whereas the reference voltage is produced by a filter smoothening the magnet voltage curve, characterized in that the electrical circuit is conceived such that a signal (Uaus) can be measured at the output of the comparator when the curve of the reference voltage (UR) and the curve of the magnet voltage (UM) cross each other and when the moment (A), signaling the end of the positioning of the magnet core, is situated within a time interval (B) defined by the two crossings (B1, B2) of the reference voltage (UR) and the magnet voltage (UM) whereas the comparator output signal is present within this time interval (B).
  6. Electrical circuit according to claim 5, characterized in that the comparator (4) is built by an operational amplifier.
  7. Electrical circuit according to any of the preceding claims 5 and 6, characterized in that the maintain of the switching signal as an output signal of the comparator (4) is done by a holding component (7) such as a flip-flop combined with a reset (6).
  8. Electrical circuit according to any of the preceding claims 5 to 7, characterized in that a filter (3) like a low-pass filter and/or a voltage divider is foreseen.
  9. Electrical circuit according to any of the preceding claims 5 to 8, characterized in that the output signal (Uaus) is optically displayed and/or injected into a control system.
EP02022489.5A 2001-10-12 2002-10-05 Process and circuit for the detection of the position of the armature of an electromagnet Expired - Lifetime EP1302952B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10150199 2001-10-12
DE10150199A DE10150199A1 (en) 2001-10-12 2001-10-12 Method and circuit for detecting the armature position of an electromagnet

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EP1302952A2 EP1302952A2 (en) 2003-04-16
EP1302952A3 EP1302952A3 (en) 2004-11-10
EP1302952B1 true EP1302952B1 (en) 2013-04-24

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EP02022489.5A Expired - Lifetime EP1302952B1 (en) 2001-10-12 2002-10-05 Process and circuit for the detection of the position of the armature of an electromagnet

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DE10150199A1 (en) 2003-04-24
EP1302952A2 (en) 2003-04-16
EP1302952A3 (en) 2004-11-10
US6949923B2 (en) 2005-09-27
US20030071613A1 (en) 2003-04-17

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