EP1353342A1 - Method and device for demagnetizing objects - Google Patents

Method and device for demagnetizing objects Download PDF

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Publication number
EP1353342A1
EP1353342A1 EP02405298A EP02405298A EP1353342A1 EP 1353342 A1 EP1353342 A1 EP 1353342A1 EP 02405298 A EP02405298 A EP 02405298A EP 02405298 A EP02405298 A EP 02405298A EP 1353342 A1 EP1353342 A1 EP 1353342A1
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Prior art keywords
current
coils
demagnetizing
objects
inverter
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German (de)
French (fr)
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EP1353342B1 (en
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Albert Maurer
Urs Meyer
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Priority to AT02405298T priority patent/ATE522915T1/en
Priority to CNB031092365A priority patent/CN100409380C/en
Publication of EP1353342A1 publication Critical patent/EP1353342A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material

Definitions

  • the invention relates to a method and a device for demagnetizing Objects according to the preambles of the independent claims.
  • a known method for demagnetizing objects uses an open one Magnetic core with a coil through which a constant alternating current flows.
  • the magnetic core is placed on the object and the alternating current is switched on.
  • the magnetic core is then slowly pulled away from the object by hand.
  • At a Device for this method are limited in size and weight of the magnetic core.
  • the Demagnetization is strongly influenced by environmental conditions and is not precise reproducible. Demagnetization is incomplete and not always equally good.
  • a coil tunnel with large, from AC flowed through, coils worked.
  • the object is covered by the Coil tunnel pulled through with a stationary magnetic field. This is the object increasingly exposed to the magnetic field, then decreasing exposure.
  • the demagnetizing Effect is limited to one direction.
  • the object of the invention is to provide a method with which objects so far can be demagnetized so that there is no longer any measurable residual magnetism.
  • Another object of the invention is to provide a device with which correspond to the process objects can be demagnetized.
  • the demagnetization process takes place in two separate steps. First become magnetically hard spots, such as weld seams, pressure points, etc., in the shadow mask Pretreated locally with high fields using choke coils in alternating fields. This magnetically hard spots are at least partially demagnetized.
  • the entire system in in this case the perforated plate as a whole with the associated frame and attachments, completely demagnetized.
  • the perforated plate by a magnetic alternating field is drawn through, it remains for a certain time locally in the magnetic field within a station.
  • the change of the alternating field in this station controlled by the coils electronically in terms of frequency and Amplitude can be controlled electronically.
  • the alternating field is brought to zero, whereupon the perforated plate is made the station is removed. It is now demagnetized to the extent that there is no residual magnetism is more measurable. The demagnetization process therefore takes place intermittently.
  • the demagnetization device comprises a transport route 1 on which the objects to be demagnetized are transported to, away and further.
  • the Transport route runs under at least one, but preferably several Pretreatment stations 2 over and then through the demagnetization station 3 therethrough.
  • Each pretreatment station 2 comprises a choke coil 21-24 in and of itself known type.
  • the demagnetization station 3 comprises two opposite one another Boxes 31, 32, each comprising a coil.
  • the two boxes with each other spaced coils form a zone in which a homogeneous field is generated.
  • the Both coils are part of a coupled synchronous series resonant circuit, which means an inverter is current controlled.
  • the two coils in boxes 31, 32 are each other are arranged opposite on both sides of a conveyor belt.
  • the objects are now in time on the transport line from the pre-treatment station 2 to pretreatment station 2 and finally through demagnetization station 3 transported.
  • the item remains in each station for a certain period of time.
  • the magnetically hard spots are caused by strong fields pretreated so that they can no longer be identified as such and the magnetic properties are reasonably balanced.
  • Second, the depth of penetration is the Magnetic strength with the same amplitude of the alternating field in the object from the Frequency of the alternating field depends. This also gives the residence time.
  • Material of 1mm thickness is suitable for a frequency of the alternating field of approximately 200 Hz, which corresponds to a residence time of at least 0.5 seconds. With increasing required depth or material thickness decreases the frequency.
  • For one Objects with a material thickness of 10mm correspond to the required frequency of the alternating field about 10 Hz and therefore an influencing time of at least 10 seconds is required.
  • the station therefore comprises two such boxes, one on each side of the item.
  • the series resonant circuit basically brings about by alternating charging and short-circuiting decaying vibrations.
  • the series resonant circuit with a current regulator or Controlled inverter.
  • the current regulator comes with provide a zero point correction.
  • the zero point correction represents a possible residual current after the oscillations of the alternating field have decayed to zero. So this is When the item is removed from the station, no tension and there is no longer a load attached.
  • the vibration in the series resonant circuit is only controlled by the current controller and thus the resonant circuit is excited and the vibrations are controlled to decay brought.
  • FIG. 2 shows examples of demagnetization curves as are now possible using this clocked method.
  • the series resonant circuit brings a usual exponential curve E through the alternation of charging and short-circuit due to decaying vibrations.
  • this demagnetization curve can now be changed into a linear L or a curvature curve K.
  • a period of at least 5 is typically used to obtain the setpoint of the current Periods used as lead time Vt.
  • the resonant circuit is left swing out damping during the required decay time At.
  • the control of the Series oscillating circuits use a current control of the inverter with rectangular pulses.
  • the desired demagnetization curve is controlled by at the beginning of the Rise of individual or each of the vibrations with an additional square pulse supports. This can dampen the vibrations and thus the course of the Demagnetization can be chosen according to the problem.
  • the duration of the process is given by the principles mentioned above. To determine the end of the process one only has to count the impulses or vibrations. For the specification of a Final values deviating from zero, the process can be carried out after a certain Cancel the preselected number of vibrations.
  • the process and the final values obtained can be monitored by separate Field measurements are carried out using separate coils or Hall sensors.

Abstract

The method involves demagnetizing objects between two mutually opposing coils forming part of a series oscillation circuit. The object is stationary between the coils for a defined period during demagnetization and the series oscillation circuit is current controlled by an inverter. The desired current is maintained for at least 5 periods and the occupation time is at least approximately 100 periods. AN Independent claim is also included for the following: an arrangement for demagnetizing objects.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Entmagnetisieren von Gegenständen nach den Oberbegriffen der unabhängigen Ansprüche.The invention relates to a method and a device for demagnetizing Objects according to the preambles of the independent claims.

Ein bekanntes Verfahren zum Entmagnetisieren von Gegenständen benützt einen offenen Magnetkern mit einer Spule, welche von einem konstanten Wechselstrom durchflossen wird. Der Magnetkern wird auf den Gegenstand aufgelegt und der Wechselstrom eingeschaltet. Darauf wird der Magnetkern langsam von Hand vom Gegenstand weggezogen. Bei einer Vorrichtung für dieses Verfahren sind Grösse und Gewicht des Magnetkerns begrenzt. Der Entmagnetisiervorgang ist stark durch Umgebungsbedingungen beeinflusst und nicht präzise reproduzierbar. Die Entmagnetisierung ist unvollständig und nicht immer gleich gut.A known method for demagnetizing objects uses an open one Magnetic core with a coil through which a constant alternating current flows. The magnetic core is placed on the object and the alternating current is switched on. The magnetic core is then slowly pulled away from the object by hand. At a Device for this method are limited in size and weight of the magnetic core. The Demagnetization is strongly influenced by environmental conditions and is not precise reproducible. Demagnetization is incomplete and not always equally good.

Bei einem weitern bekannten Verfahren wird mit einem Spulentunnel mit grossen, von Wechselstrom durchflossenen, Spulen gearbeitet. Der Gegenstand wird durch den Spulentunnel mit stationärem Magnetfeld hindurchgezogen. Dadurch ist der Gegenstand dem Magnetfeld zuerst zunehmend, dann abnehmend ausgesetzt. Die entmagnetisierende Wirkung ist auf eine einzige Richtung beschränkt.In a further known method, a coil tunnel with large, from AC flowed through, coils worked. The object is covered by the Coil tunnel pulled through with a stationary magnetic field. This is the object increasingly exposed to the magnetic field, then decreasing exposure. The demagnetizing Effect is limited to one direction.

Bei der heutigen Verwendung von Materialen für mechanische Komponenten und der breiten Verwendung von empfindlichen elektronischen Komponenten und Schaltungen wird der Restmagnetismus in Gegenständen zu einem immer wichtigeren Problem. Der in Gegenständen vorhandene Restmagnetismus wird zu einem zentralen Qualitätskriterium für Zulieferer. Durch höhere Technologie und Materialauswahl kann insbesondere bei der Massenteilefertigung der Kostenfaktor reduziert werden. Allerdings handelt man sich dafür andere Störfaktoren, wie eben Restmagnetismus, ein. With today's use of materials for mechanical components and the broad The use of sensitive electronic components and circuits Residual magnetism in objects to an increasingly important problem. The in Objects existing residual magnetism becomes a central quality criterion for Suppliers. Due to higher technology and choice of materials, the Mass production the cost factor can be reduced. However, it is for that other disruptive factors, such as residual magnetism.

Aufgabe der Erfindung ist es, ein Verfahren anzugeben, mit welchem Gegenstände soweit entmagnetisiert werden können, dass kein messbarer Restmagnetismus mehr vorhanden ist.The object of the invention is to provide a method with which objects so far can be demagnetized so that there is no longer any measurable residual magnetism.

Eine weitere Aufgabe der Erfindung besteht darin, eine Vorrichtung anzugeben, mit welcher entsprechen dem Verfahren Gegenstände entmagnetisiert werden können.Another object of the invention is to provide a device with which correspond to the process objects can be demagnetized.

Diese Aufgabe wird durch die Erfindung gemäss den Oberbegriffen der unabhängigen Patentansprüche gelöst.This object is achieved by the invention according to the preambles of the independent Claims resolved.

Die Erfindung wird nachstehend im Zusammenhang mit den Zeichnungen beschrieben. Es zeigen:

Figur 1
Vorrichtung in Ansicht
Figur 2 und
Entmagnetisierungskurven
Figur 3
Stützen der Schwingungen
The invention is described below in connection with the drawings. Show it:
Figure 1
Device in view
Figure 2 and
demagnetization
Figure 3
Support the vibrations

Nachfolgend wird kurz auf die Grundlagen und Grundgedanken der erfindungsgemässen Verfahrens eingegangen. Als typischer Gegenstand, welcher entmagnetisiert werden soll, wird ein Bildschirm, respektive eine Lochmaske eines Bildschirmes als Ganzes mit dem dazugehörenden Rahmen und Anbauten angenommen. Diese Lochmaske dient hierbei nur als ein markantes Beispiel für solche Gegenstände.The following is briefly the basics and basic ideas of the inventive Process received. As a typical object to be demagnetized, becomes a screen or a shadow mask of a screen as a whole with the associated frames and attachments accepted. This shadow mask only serves here as a striking example of such items.

Das Verfahren zur Entmagnetisierung geschieht in zwei gesonderten Schritten. Zuerst werden magnetisch harte Stellen, wie Schweissnähte, Druckstellen usw., in der Lochmaske örtlich lokal mit hohen Feldern mittels Drosselspulen im Wechselfeld vorbehandelt. Diese magnetisch harten Stellen werden dadurch mindestens teilweise entmagnetisiert.The demagnetization process takes place in two separate steps. First become magnetically hard spots, such as weld seams, pressure points, etc., in the shadow mask Pretreated locally with high fields using choke coils in alternating fields. This magnetically hard spots are at least partially demagnetized.

In einem nun erfindungsgemäss entscheidenden zweiten Schritt wird das ganze System, in diesem Falle die Lochplatte als Ganzes mit dem dazugehörenden Rahmen und Anbauten, komplett entmagnetisiert. Statt dass, gemäss Stand der Technik, die Lochplatte durch ein magnetisches Wechselfeld durchgezogen wird, ver bleibt sie während einer gewissen Zeit örtlich im Magnetfeld innerhalb einer Station. Nun wird die Aenderung des Wechselfeldes in dieser Station gesteuert, indem die Spulen elektronisch in Bezug auf Frequenz und Amplitude elektronisch gesteuert werden. Nach einer gewissen Aufenthaltszeit der Lochplatte in der Station wird das Wechselfeld auf Null gebracht, worauf die Lochplatte aus der Station entfernt wird. Sie ist nun soweit entmagnetisiert, dass kein Restmagnetismus mehr messbar ist. Der Ablauf der Entmagnetisierung findet also Taktweise statt.In a second step, which is now decisive according to the invention, the entire system, in in this case the perforated plate as a whole with the associated frame and attachments, completely demagnetized. Instead of that, according to the prior art, the perforated plate by a magnetic alternating field is drawn through, it remains for a certain time locally in the magnetic field within a station. Now the change of the alternating field in this station controlled by the coils electronically in terms of frequency and Amplitude can be controlled electronically. After a certain period of stay Perforated plate in the station, the alternating field is brought to zero, whereupon the perforated plate is made the station is removed. It is now demagnetized to the extent that there is no residual magnetism is more measurable. The demagnetization process therefore takes place intermittently.

Die Vorrichtung nach Figur 1 zeigt eine Ausführung, welche nach diesen Grundgedanken arbeitet. Die Entmagnetisierungsvorrichtung umfasst eine Transportstrasse 1, auf welche die zu entmagnetisierenden Gegenstände zu-, weg- und weitertransportiert werden. Die Transportstrasse führt unter mindestens einer, vorzugsweise aber mehreren Vorbehandlungsstationen 2 vorbei und anschliessend durch die Entmagnetisierungsstation 3 hindurch. Jede Vorbehandlungsstation 2 umfasst eine Drosselspule 21- 24 an und für sich bekannter Art. Die Entmagnetisierungsstation 3 umfasst zwei einander gegenüberliegende Boxen 31, 32, welche je eine Spule umfassen. Die beiden Boxen mit den voneinander beabstandeten Spulen bilden eine Zone in der eine homogenes Feld erzeugt wird. Die beiden Spulen sind Teil eines gekoppelten synchronen Serieschwingkreises, welcher mittels einem Inverter stromgesteuert ist. Die beiden Spulen in den Boxen 31, 32 sind einander gegenüberliegend beiderseits eines Transportbandes angeordnet sind.The device according to FIG. 1 shows an embodiment which is based on these basic ideas is working. The demagnetization device comprises a transport route 1 on which the objects to be demagnetized are transported to, away and further. The Transport route runs under at least one, but preferably several Pretreatment stations 2 over and then through the demagnetization station 3 therethrough. Each pretreatment station 2 comprises a choke coil 21-24 in and of itself known type. The demagnetization station 3 comprises two opposite one another Boxes 31, 32, each comprising a coil. The two boxes with each other spaced coils form a zone in which a homogeneous field is generated. The Both coils are part of a coupled synchronous series resonant circuit, which means an inverter is current controlled. The two coils in boxes 31, 32 are each other are arranged opposite on both sides of a conveyor belt.

Die Gegenstände werden nun im Takt auf der Transportstrasse von Vorbehandlungsstation 2 zu Vorbehandlungsstation 2 und schliesslich durch die Entmagnetisierungsstation 3 transportiert. In jeder Station verbleibt der Gegenstand während einer gewissen Zeitspanne. In den Vorbehandlungsstationen werden die magnetisch harten Stellen durch starke Felder vorbehandelt, so dass sie nicht mehr als solche festgestellt werden können und die magnetischen Eigenschaften einigermassen ausgeglichen sind.The objects are now in time on the transport line from the pre-treatment station 2 to pretreatment station 2 and finally through demagnetization station 3 transported. The item remains in each station for a certain period of time. In the pre-treatment stations, the magnetically hard spots are caused by strong fields pretreated so that they can no longer be identified as such and the magnetic properties are reasonably balanced.

In der eigentlichen und massgebenden Entmagnetisierungsstation 3 werden nun der die magnetischen Eigenschaften der Gegenstände auf nicht mehr messbare Werte reduziert. Auch in dieser Station verbleiben die Gegenstände während der dazu benötigten Beeinflussungszeit ortsfest.In the actual and authoritative demagnetization station 3, the magnetic properties of the objects reduced to values that can no longer be measured. In this station, too, the objects remain while they are needed Influence time fixed.

Es handelt sich also um ein getaktetes Durchlaufverfahren. Für dieses getaktete Durchlaufverfahren mit dem Transport und dem Betrieb der Vorbehandlungsstationen 2 wird eine Steuerung bekannter Art verwendet. Für die Ansteuerung der Entmagnetisierungsstation 3 allein wird eine weitere und separate spezielle Inverterregelung 4 benützt. Die Taktzeiten werden dem Problem respektive den Behandlungszeiten in der einzelnen Stationen angepasst. Dabei gibt die längste Behandlungszeit in einer der Stationen die Taktrate vor. Eine Automatisierung ist möglich. So it is a clocked continuous process. For this clocked Continuous process with the transport and operation of the pretreatment stations 2 a controller of known type used. For controlling the Demagnetization station 3 alone becomes a further and separate special inverter control 4 used. The cycle times are the problem or the treatment times in the adapted to individual stations. The longest treatment time is in one of the Advance the clock rate. Automation is possible.

Um diese zu ermöglichen werden einige Grundsätze aufgestellt. Erstens muss die Aufenthaltszeit des Gegenstandes im Wechselfeld mindestens einer Zeitspanne von annähernd 100 Perioden oder Wechselpulsen entsprechen. Zweitens ist die Eindringtiefe der Magnetstärke bei gleicher Amplitude des Wechselfeldes in den Gegenstand von der Frequenz des Wechselfeldes abhängig. Dadurch ist auch die Aufenthaltszeit gegeben. Für Material von 1mm Stärke eignet sich eine Frequenz des Wechselfeldes von etwa 200 Hz, was einer Aufenthaltszeit von mindestens 0,5 Sekunden entspricht. Mit zunehmender benötigter Eindringtiefe respektive Materialdicke nimmt die Frequenz ab. Für einen Gegenstand mit 10mm Materialdicke entspricht die benötigte Frequenz des Wechselfeldes etwa 10 Hz und damit wird eine Beeinflussungszeit von mindestens 10 Sekunden benötigt.In order to make this possible, some principles are set up. First, it has to Time of stay of the object in the alternating field at least a period of correspond to approximately 100 periods or alternating pulses. Second, the depth of penetration is the Magnetic strength with the same amplitude of the alternating field in the object from the Frequency of the alternating field depends. This also gives the residence time. For Material of 1mm thickness is suitable for a frequency of the alternating field of approximately 200 Hz, which corresponds to a residence time of at least 0.5 seconds. With increasing required depth or material thickness decreases the frequency. For one Objects with a material thickness of 10mm correspond to the required frequency of the alternating field about 10 Hz and therefore an influencing time of at least 10 seconds is required.

Um eine schnelle Taktrate für den Durchlauf der Entmagnetisierungen zu erhalten wird nun die Frequenz des Wechselfeldes optimiert, indem man die Frequenz den Eigenschaften des Gegenstandes entsprechend möglichst hoch wählt.In order to get a fast clock rate for the passage of the demagnetizations is now optimizes the frequency of the alternating field by matching the frequency to the properties of the Choose the object as high as possible.

Dies wird nun durch Verwenden eines Serieschwingkreises mit Spule und Kondensator erreicht. Dieser ist in einer geschlossenen Box untergebracht. Dadurch kann Spannung und Strom ausserhalb der Box klein gehalten werden, während die für das Wechselfeld nötigen hohen Spannungen im Lade - Entladezyklus nur innerhalb der Box vorhanden sind. Dies verhindert Gefahren für Bedienungspersonal weitestgehend. Die Station umfasst also zwei solche Boxen, je eine auf einer Seite des Gegenstandes.This is now done by using a series resonant circuit with a coil and capacitor reached. This is housed in a closed box. This can create tension and Current outside the box can be kept small, while the necessary for the alternating field high voltages in the charge / discharge cycle are only present within the box. This largely prevents dangers for operating personnel. The station therefore comprises two such boxes, one on each side of the item.

Der Serieschwingkreis bringt grundsätzlich durch den Wechsel von Laden und Kurzschluss abklingende Schwingungen. Nun wird der Serieschwingkreis mit einem Stromregler oder Inverter angesteuert. Dadurch wird ein weiterer Vorteil ermöglicht, indem die Temperatur in der Spule selbst Ueberwachung und konstant gehalten werden kann. Damit bleibt das erzeugte Feld ohne unerwünschten Temperatureinfluss präzise. Der Stromregler wird mit einer Nullpunktkorrektur versehen. Die Nullpunktkorrektur stellt einen allfälligen Reststrom nach dem Abklingen der Schwingungen des Wechselfeldes auf Null. Somit ist an diesem Zeitpunkt, an dem der Gegenstand aus der Station genommen wird, keine Spannung und keine Ladung mehr anliegend vorhanden.The series resonant circuit basically brings about by alternating charging and short-circuiting decaying vibrations. Now the series resonant circuit with a current regulator or Controlled inverter. This enables another advantage by keeping the temperature in the coil itself can be monitored and kept constant. That stays with it generated field without undesired temperature influence precisely. The current regulator comes with provide a zero point correction. The zero point correction represents a possible residual current after the oscillations of the alternating field have decayed to zero. So this is When the item is removed from the station, no tension and there is no longer a load attached.

Die Schwingung im Serieschwingkreis wird nur über den Stromregler gesteuert und damit der Schwingkreis gesteuert angeregt und die Schwingungen auch gesteuert zum Abklingen gebracht. The vibration in the series resonant circuit is only controlled by the current controller and thus the resonant circuit is excited and the vibrations are controlled to decay brought.

In der Figur 2 sind Beispiele von Entmagnetisierungskurven dargestellt, wie sie nach diesem getakteten Verfahren nun möglich sind. Der Serieschwingkreis bringt durch den Wechsel von Laden und Kurzschluss durch abklingende Schwingungen eine übliche Exponentialkurve E. Für Gegenstände, welche besondere Anforderungen an die Entmagnetisierung stellen, kann nun diese Entmagnetisierungskurve in eine Lineare L oder eine Krümmungskurve K verändert werden. Man kann nun die Zeitdauer bestimmen, in welcher der Restmagnetismus im Gegenstand bis auf nicht mehr messbare Werte hinuntergebracht werden kann. Der Gegenstand bleibt während dieser Dauer ortsfest im Bereich zwischen den beiden benachbarten Schwingkreisen. Die Schwingungen der Serieschwingkreise werden stromgesteuert auf einen, durch die benötigte Eindringtiefe bedingten, Sollwert (= 100%) gebracht und anschliessend auf annähernd Null (10-3 bis 10-4) zurückgefahren. Es ist so auch möglich, den Endwert bewusst abweichend von Null auf einer bestimmten Höhe zu erhalten.FIG. 2 shows examples of demagnetization curves as are now possible using this clocked method. The series resonant circuit brings a usual exponential curve E through the alternation of charging and short-circuit due to decaying vibrations. For objects that place special demands on demagnetization, this demagnetization curve can now be changed into a linear L or a curvature curve K. One can now determine the time period in which the residual magnetism in the object can be brought down to values that can no longer be measured. During this period, the object remains stationary in the area between the two adjacent resonant circuits. The vibrations of the series resonant circuits are brought under current control to a setpoint (= 100%) due to the required penetration depth and then reduced to almost zero (10 -3 to 10 -4 ). It is also possible to consciously maintain the final value deviating from zero at a certain level.

Um den Sollwert des Stromes zu erhalten wird typischerweise eine Dauer von mindestens 5 Perioden als Vorlaufzeit Vt eingesetzt. Dabei kann zu Beginn sogar eine leichte Uebersteuerung in Kauf genommen werden. Erst nach Vorhandensein der benötigten Stromstärke, also nach Ablauf der mindestens 5 Perioden, lässt man den Schwingkreis dämpfend ausschwingen während der benötigten Ausschwingzeit At. Die Steuerung der Serieschwingkreise wird eine Stromregelung des Inverters mit Rechteckimpulsen verwendet. Nun wird die gewünschte Entmagnetisierungskurve gesteuert, indem man zu Beginn des Anstieges einzelner oder jeder der Schwingungen mit einem zusätzlichen Rechteckimpuls stützt. Damit kann die Dämpfung der Schwingungen und damit der Ablauf der Entmagnetisierung dem Problem entsprechend gewählt werden. Die Dauer des Vorganges ist durch oben erwähnte Grundsätze gegeben. Um das Ende des Vorganges festzustellen muss man nur die Impulse respektive die Schwingungen zählen. Für die Vorgabe eines Endwertes abweichend von Null kann man den Vorgang nach einer bestimmten vorgewählten Anzahl Schwingungen abbrechen.A period of at least 5 is typically used to obtain the setpoint of the current Periods used as lead time Vt. In the beginning, even an easy one Oversteer to be accepted. Only after the required are available Amperage, i.e. after the at least 5 periods have elapsed, the resonant circuit is left swing out damping during the required decay time At. The control of the Series oscillating circuits use a current control of the inverter with rectangular pulses. Now the desired demagnetization curve is controlled by at the beginning of the Rise of individual or each of the vibrations with an additional square pulse supports. This can dampen the vibrations and thus the course of the Demagnetization can be chosen according to the problem. The duration of the process is given by the principles mentioned above. To determine the end of the process one only has to count the impulses or vibrations. For the specification of a Final values deviating from zero, the process can be carried out after a certain Cancel the preselected number of vibrations.

Eine Ueberwachung des Vorganges und der erhaltenen Endwerte kann durch separate Feldmessung mittels getrennten Spulen oder Hall-Senoren erfolgen.The process and the final values obtained can be monitored by separate Field measurements are carried out using separate coils or Hall sensors.

Nach dem gesteuerten Ausschwingen der Serieschwingkreise tritt automatisch die Nullpunktkorrektur des Stromreglers/Inverters in Funktion und stellt jeden allfälligen Reststrom nach dem Abklingen der Schwingungen des Wechselfeldes auf Null. Somit ist zu diesem Zeitpunkt, während dem der Gegenstand aus der Station genommen wird, keine Spannung und keine Ladung mehr anliegend vorhanden. Dies ist ein ausserordentlicher Vorteil für die Vorrichtung zum Entmagnetisieren. Da der Transport der Gegenstände durch das Transportband getaktet erfolgt, besteht kein Anlass für Bedienungspersonen, von Hand einzugreifen und irgendwelche Manipulationen vorzunehmen. Weil zu diesem Zeitpunkt keine Spannung mehr anliegt, kein Strom mehr fliesst und keine Ladungen in den Serieschwingkreisen mehr vorhanden sind, besteht auch keine Gefahr von elektrischen Schlägen für Bedienungspersonal. Wenn also die Vorrichtung schliesslich abgestellt ist, sind auch keinerlei Restladungen mehr vorhanden. Dies macht Reparaturen und Wartung, bsp. am Transportband, völlig ungefährlich.After the controlled swinging out of the series resonant circuits, that occurs automatically Zero point correction of the current controller / inverter in operation and provides any Residual current after the oscillations of the alternating field have decayed to zero. So is too at this point during which the item is removed from the station, none Tension and no more charge present. This is an extraordinary one Advantage for the device for demagnetizing. Because the transportation of items through the conveyor belt is clocked, there is no reason for operators to do it by hand to intervene and make any manipulations. Because at this time there is no more voltage, no more current and no charges in the Series resonant circuits are no longer present, there is also no risk of electrical Beats for operators. So when the device is finally turned off also no residual loads left. This makes repairs and maintenance, e.g. on the conveyor belt, completely harmless.

Claims (10)

Verfahren und eine Vorrichtung zum Entmagnetisieren von Gegenständen zwischen zwei einander gegenüberliegenden Spulen, dadurch gekennzeichnet, dass die Spulen Teil eines Serieschwingkreises sind und dass der Gegenstand während der Aufenthaltszeit von einer bestimmten Dauer im Bereich zwischen den beiden Spulen ortsfest ist und dass die Serieschwingkreise mittels eines Inverters stromgesteuert werden.Method and device for demagnetizing objects between two opposing coils, characterized in that the coils are part of a series resonant circuit and that the object is stationary during a period of time of a certain duration in the area between the two coils and that the series resonant circuits by means of an inverter be current controlled. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Sollstrom während einer Dauer von minimal 5 Perioden erhalten bleibt.A method according to claim 1, characterized in that the target current is maintained for a minimum of 5 periods. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Aufenthaltszeit mindestens annähernd 100 Perioden dauert.A method according to claim 1, characterized in that the residence time lasts at least approximately 100 periods. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Perioden der Serieschwingkreise mittels eines Inverters Stromgesteuert entlang einer Entmagnetisierungskurve gesteuert von einem Sollstrom auf einen Endstrom vermindert werden.Method according to one of claims 1 to 3, characterized in that the periods of the series resonant circuits are reduced in a current-controlled manner by means of an inverter along a demagnetization curve, controlled from a desired current to a final current. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Entmagnetisierungskurve durch Stützen einzelner Schwingungen der Serieschwingkreise durch Stützen der Amplitude mittels Rechteckimpulsen durch den Inverter erreicht wird.A method according to claim 4, characterized in that the demagnetization curve is achieved by supporting individual vibrations of the series oscillating circuits by supporting the amplitude by means of rectangular pulses by the inverter. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass Endstrom vorwählbar ist und dass nach Beenden des Entmagnetisiervorganges die Serieschwingkreise mittels einer Nullpunktkorrektur spannungslos, stromlos und ladungslos gemacht wird.A method according to claim 4, characterized in that the final current can be preselected and that after the demagnetization process has ended, the series oscillating circuits are de-energized, de-energized and de-energized by means of a zero point correction. Vorrichtung zum Entmagnetisieren von Gegenständen mit einer Entmagnetisierungsstation, welche eine Spule umfasst, dadurch gekennzeichnet, dass zwei voneinander beabstandete Spulen vorhanden sind, welche dazwischen eine homogene Feldzone bilden und welche Teil eines Serieschwingkreises sind, welcher mittels einem Inverter stromgesteuert ist, wobei die beiden Spulen in je einer Box einander gegenüberliegend beiderseits eines Transportbandes angeordnet sind.Device for demagnetizing objects with a demagnetizing station, which comprises a coil, characterized in that there are two spaced-apart coils, which form a homogeneous field zone between them and which are part of a series resonant circuit which is current-controlled by means of an inverter, the two coils in one box is arranged opposite each other on both sides of a conveyor belt. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass in Transportrichtung des Transportbandes mindestens eine Vorbehandlungsstation zum Entmagnetisieren von magnetisch harten Stellen im Gegenstand vorhanden ist. Apparatus according to claim 7, characterized in that there is at least one pretreatment station for demagnetizing magnetically hard spots in the object in the transport direction of the conveyor belt. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass der Transport der Gegenstände auf dem Transportband getaktet im Start-Stop Betrieb erfolgt.Apparatus according to claim 7, characterized in that the transport of the objects on the conveyor belt is carried out clocked in the start-stop mode. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass sie für die Durchführung des Verfahrens nach einem der Ansprüche 1 bis 6 verwendet wird.Apparatus according to claim 7, characterized in that it is used for carrying out the method according to one of claims 1 to 6.
EP02405298A 2002-04-12 2002-04-12 Method and device for demagnetizing objects Expired - Lifetime EP1353342B1 (en)

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EP02405298A EP1353342B1 (en) 2002-04-12 2002-04-12 Method and device for demagnetizing objects
AT02405298T ATE522915T1 (en) 2002-04-12 2002-04-12 METHOD AND DEVICE FOR DEMAGNETIZING OBJECTS
CNB031092365A CN100409380C (en) 2002-04-12 2003-04-04 Method and device for demagnetizing body

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EP02405298A EP1353342B1 (en) 2002-04-12 2002-04-12 Method and device for demagnetizing objects

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EP1353342B1 EP1353342B1 (en) 2011-08-31

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DE102008007896B4 (en) 2007-02-21 2019-06-27 Albert Maurer demagnetizing
DE102018108037A1 (en) 2018-04-05 2019-10-10 Marek Rohner Device and method for demagnetizing objects

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CN111243825B (en) * 2018-11-29 2023-06-16 阿尔贝特·莫伊雷尔 Device for demagnetizing ferromagnetic material

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DE3500011A1 (en) * 1985-01-02 1985-06-13 Axel R. Dr.-Ing. 5900 Siegen Hidde Method and arrangement for the regulated demagnetisation of rod-shaped, ferromagnetic and heat-treated semi-finished goods or finished goods in a continuous production process
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DE102008007896B4 (en) 2007-02-21 2019-06-27 Albert Maurer demagnetizing
DE102017109149A1 (en) 2017-04-28 2018-10-31 Marek Rohner Device and method for demagnetizing objects
DE102018108037A1 (en) 2018-04-05 2019-10-10 Marek Rohner Device and method for demagnetizing objects

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ATE522915T1 (en) 2011-09-15
CN1452188A (en) 2003-10-29
CN100409380C (en) 2008-08-06
EP1353342B1 (en) 2011-08-31

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