EP0911840A2 - Control circuit for an electromagnet - Google Patents

Control circuit for an electromagnet Download PDF

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Publication number
EP0911840A2
EP0911840A2 EP98402623A EP98402623A EP0911840A2 EP 0911840 A2 EP0911840 A2 EP 0911840A2 EP 98402623 A EP98402623 A EP 98402623A EP 98402623 A EP98402623 A EP 98402623A EP 0911840 A2 EP0911840 A2 EP 0911840A2
Authority
EP
European Patent Office
Prior art keywords
switch
coil
phase
current generator
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98402623A
Other languages
German (de)
French (fr)
Other versions
EP0911840A3 (en
Inventor
Karim Benkaroun
Yves Guermeur
Daniel Riffaud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric SE
Schneider Electric Industries SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schneider Electric SE, Schneider Electric Industries SAS filed Critical Schneider Electric SE
Publication of EP0911840A2 publication Critical patent/EP0911840A2/en
Publication of EP0911840A3 publication Critical patent/EP0911840A3/en
Withdrawn legal-status Critical Current

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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
    • H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
    • H01F7/1816—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current making use of an energy accumulator
    • 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
    • H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
    • H01F7/1833—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current by changing number of parallel-connected turns or windings

Definitions

  • the present invention relates to a control circuit for an electromagnet with two coils, namely a first coil supplied on call and a second coil supplied with maintenance.
  • this circuit including a source of DC voltage to power the coils, as well as a first switch and a second switch respectively associated with the coil call and the holding coil to control the passage of the current.
  • patent DE-21 28 651 a control circuit for an electromagnet is described. with two coils.
  • the duration of which is determined by charging a capacitor at a level determined by a Zener diode, the two coils are supplied to provide the energy necessary to closing the electromagnet; in the maintenance phase, only one of the coils continue to be energized.
  • this control circuit has the disadvantage to require a source of energy capable of powering at the same time time to call the two coils.
  • the present invention aims to allow the use of a source reduced level energy, for example similar to call and hold, and to simplify the control circuit necessary for this purpose.
  • the current generator can be dimensioned to provide energy constant and relatively small; the calling energy of the electromagnet comes from the permanent energy developed by the second coil from of the current generator and the auxiliary energy developed by the first coil using capacity.
  • the first switch is located between the current generator and capacity and connected to the current generator via a non-return diode, while the second switch is placed in series with the parallel mounting of the two coils so as to be closed for the call phase and during the hold phase and open at rest.
  • the generator can deliver an adjustable current level, the control member being connected to the current generator for transmit a higher current setpoint to it during the call phase than during the maintenance phase.
  • the control member being connected to the current generator for transmit a higher current setpoint to it during the call phase than during the maintenance phase.
  • Figure 1 shows the diagram of a control circuit according to the invention.
  • Figure 2 is a graph showing the variation of the current in the coils during an order cycle.
  • the control circuit shown is associated with the electromagnet E of a electromechanical contactor whose contacts are to be closed and opened in response to a start or stop command.
  • the control circuit includes terminals A1, A2 connected to a DC voltage source or rectified alternating voltage V; the application of this voltage is determined by a mechanical or electronic on-off switch S.
  • the positive terminal Ai and the negative terminal A2 of the circuit are connected by positive 1 and negative 2 conductors respectively to a control member 10 and two coils L1, L2 generating the required ampere-turns.
  • a current generator 11 is provided at the input of the control circuit able to supply a relatively small and preferably constant current, by example of the order of 100 mA.
  • the upper terminal of the coil L1 is connected to the positive conductor 1 by via a non-return diode D1 and a switch T1 constituted by example by a transistor.
  • the upper terminal of coil L2 is connected directly to the positive conductor 1.
  • the coils L1 and L2 are arranged in parallel and their lower terminal is connected to the negative conductor 2 via a switch T2 constituted for example by a transistor.
  • a Zener Z1 diode can optionally be provided to bypass switch T2.
  • a capacity C1 which is used to supply the coil L1 in the call phase is connected between the upper terminal of L1 and the negative conductor 2.
  • the controller 10 has inputs 10a, 10b connected to the circuit upstream of the current generator il and respectively at a point of the circuit close to the capacity Ci to detect the voltage V and respectively the voltage VC1 of the capacity; it has outputs 10c, 10d to drive the switches T1 and T2 respectively.
  • the current generator delivers a high current level 12A or a low current level 12B depending a switching signal or a switchable current setpoint supplied by the control unit 10.
  • Switch S is initially open, so that the solenoid is deactivated and that the contactor contacts are open; switch S is closed at time t0 to activate the electromagnet in order to close the contacts of the contactor.
  • control member detects a sufficient voltage at its input 10a at terminals A1, A2, it triggers the call phase by making T1 passing, while keeping T2 blocked, so that the capacity Ci load (figure 2-A).
  • the control device detects a voltage at its input 10b sufficient charge of capacity C1, and consequently it blocks T1 and makes T2 pass ( Figures 2-B and 2-D).
  • the capacity C1 discharges in the coil L1 (figure 2-C), while the coil L2 is directly powered by the current generator 11 (left part of the figure 2-E).
  • the energy then supplied jointly by the coils L1 and L2 allows to close the contactor contacts.
  • the end t2 of the call phase is determined by the member 10 which leaves the transistors T1, T2 in the previous state and which transmits to the generator current there a setpoint change signal, the latter passing through example from 100 mA to 50 mA to reduce the energy consumption of the holding control circuit (see right part of Figure 2-E).
  • the L2 coil is then de-energized controlled at time t3 by opening the switch S.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Relay Circuits (AREA)

Abstract

A first switch commands a capacitance discharge through a first coil in the call phase and the second coil is fed through a second coil via a second switch during the call and maintenance phase preventing the current in the second coil from falling.

Description

La présente invention concerne un circuit de commande pour électroaimant à deux bobines, à savoir une première bobine alimentée à l'appel et une deuxième bobine alimentée au maintien. ce circuit comprenant une source d'énergie à tension continue pour alimenter les bobines, ainsi qu'un premier interrupteur et un deuxième interrupteur associés respectivement à la bobine d'appel et à la bobine de maintien pour y commander le passage du courant.The present invention relates to a control circuit for an electromagnet with two coils, namely a first coil supplied on call and a second coil supplied with maintenance. this circuit including a source of DC voltage to power the coils, as well as a first switch and a second switch respectively associated with the coil call and the holding coil to control the passage of the current.

Dans le brevet DE-21 28 651 est décrit un circuit de commande pour électroaimant à deux bobines. Dans la phase d'appel, dont la durée est déterminée par la charge d'une capacité à un niveau déterminé par une diode Zener, les deux bobines sont alimentées pour procurer l'énergie nécessaire à la fermeture de l'électroaimant ; dans la phase de maintien, seule l'une des bobines continue d'être alimentée. Mais ce circuit de commande a pour inconvénient d'exiger une source d'énergie capable d'alimenter en même temps à l'appel les deux bobines.In patent DE-21 28 651, a control circuit for an electromagnet is described. with two coils. In the appeal phase, the duration of which is determined by charging a capacitor at a level determined by a Zener diode, the two coils are supplied to provide the energy necessary to closing the electromagnet; in the maintenance phase, only one of the coils continue to be energized. But this control circuit has the disadvantage to require a source of energy capable of powering at the same time time to call the two coils.

La présente invention a pour but de permettre de recourir à une source d'énergie de niveau réduit, par exemple similaire à l'appel et au maintien, et de simplifier le circuit de commande nécessaire à cet effet.The present invention aims to allow the use of a source reduced level energy, for example similar to call and hold, and to simplify the control circuit necessary for this purpose.

Selon l'invention,

  • la source d'énergie comprend un générateur de courant et une capacité alimentée par ce générateur de courant,
  • un organe de commande pilote un premier interrupteur et un deuxième interrupteur, de manière que le premier interrupteur commande pendant la phase d'appel la décharge de la capacité dans la première bobine, et que le deuxième interrupteur établit pendant la phase d'appel et pendant la phase de maintien, - et respectivement interrompt à la retombée - , le passage du courant dans la deuxième bobine.
According to the invention,
  • the energy source comprises a current generator and a capacity supplied by this current generator,
  • a controller controls a first switch and a second switch, so that the first switch controls during the call phase the discharge of the capacity in the first coil, and that the second switch establishes during the call phase and during the holding phase, - and respectively interrupts the fallout -, the flow of current through the second coil.

Ainsi le générateur de courant peut être dimensionné pour fournir une énergie constante et relativement réduite ; l'énergie d'appel de l'électroaimant provient de l'énergie permanente développée par la deuxième bobine à partir du générateur de courant et de l'énergie d'appoint développée par la première bobine à l'aide de la capacité.So the current generator can be dimensioned to provide energy constant and relatively small; the calling energy of the electromagnet comes from the permanent energy developed by the second coil from of the current generator and the auxiliary energy developed by the first coil using capacity.

Dans un mode de réalisation simple, le premier interrupteur est situé entre le générateur de courant et la capacité et relié au générateur de courant via une diode antiretour, tandis que le deuxième interrupteur est placé en série avec le montage parallèle des deux bobines de manière à être fermé pendant la phase d'appel et pendant la phase de maintien et ouvert au repos.In a simple embodiment, the first switch is located between the current generator and capacity and connected to the current generator via a non-return diode, while the second switch is placed in series with the parallel mounting of the two coils so as to be closed for the call phase and during the hold phase and open at rest.

Dans certains cas, le générateur de peut délivrer un niveau de courant réglable, l'organe de commande étant connecté au générateur de courant pour lui transmettre une consigne de courant plus élevée pendant la phase d'appel que pendant la phase de maintien. On peut ainsi accentuer l'énergie disponible à l'appel tout en conservant l'avantage obtenu grâce à l'invention.In some cases, the generator can deliver an adjustable current level, the control member being connected to the current generator for transmit a higher current setpoint to it during the call phase than during the maintenance phase. We can thus accentuate the energy available on call while retaining the advantage obtained thanks to the invention.

La description est faite ci-après d'un mode de réalisation non limitatif de l'invention, en regard des dessins annexés.The description is given below of a non-limiting embodiment of the invention, next to the accompanying drawings.

La figure 1 représente le schéma d'un circuit de commande conforme à l'invention.Figure 1 shows the diagram of a control circuit according to the invention.

La figure 2 est un graphe montrant la variation du courant dans les bobines au cours d'un cycle de commande.Figure 2 is a graph showing the variation of the current in the coils during an order cycle.

Le circuit de commande représenté est associé à l'électroaimant E d'un contacteur électromécanique dont on souhaite fermer et ouvrir les contacts en réponse à un ordre de marche ou d'arrêt. Le circuit de commande comprend des bornes A1,A2 reliées à une source de tension continue ou de tension alternative redressée V ; l'application de cette tension est déterminée par un interrupteur mécanique ou électronique S de marche-arrêt. La borne positive Ai et la borne négative A2 du circuit sont reliées par des conducteurs respectivement positif 1 et négatif 2 à un organe de commande 10 et à deux bobines L1,L2 engendrant les ampères-tours requis.The control circuit shown is associated with the electromagnet E of a electromechanical contactor whose contacts are to be closed and opened in response to a start or stop command. The control circuit includes terminals A1, A2 connected to a DC voltage source or rectified alternating voltage V; the application of this voltage is determined by a mechanical or electronic on-off switch S. The positive terminal Ai and the negative terminal A2 of the circuit are connected by positive 1 and negative 2 conductors respectively to a control member 10 and two coils L1, L2 generating the required ampere-turns.

Il est prévu à l'entrée du circuit de commande un générateur 11 de courant apte à fournir un courant relativement réduit et de préférence constant, par exemple de l'ordre de 100 mA.A current generator 11 is provided at the input of the control circuit able to supply a relatively small and preferably constant current, by example of the order of 100 mA.

La borne haute de la bobine L1 est connectée au conducteur positif 1 par l'intermédiaire d'une diode antiretour D1 et d'un interrupteur T1 constitué par exemple par un transistor. La borne haute de la bobine L2 est connectée directement au conducteur positif 1. Les bobines L1 et L2 sont disposées en parallèle et leur borne basse est connectée au conducteur négatif 2 via un interrupteur T2 constitué par exemple par un transistor. Une diode Zener Z1 peut être prévue facultativement pour shunter l'interrupteur T2. Une capacité C1 qui sert à alimenter la bobine L1 dans la phase d'appel est connectée entre la borne haute de L1 et le conducteur négatif 2.The upper terminal of the coil L1 is connected to the positive conductor 1 by via a non-return diode D1 and a switch T1 constituted by example by a transistor. The upper terminal of coil L2 is connected directly to the positive conductor 1. The coils L1 and L2 are arranged in parallel and their lower terminal is connected to the negative conductor 2 via a switch T2 constituted for example by a transistor. A Zener Z1 diode can optionally be provided to bypass switch T2. A capacity C1 which is used to supply the coil L1 in the call phase is connected between the upper terminal of L1 and the negative conductor 2.

L'organe de commande 10 possède des entrées 10a, 10b reliées au circuit en amont du générateur de courant il et respectivement à un point du circuit proche de la capacité Ci pour détecter la tension V et respectivement la tension VC1 de la capacité ; il possède des sorties 10c,10d pour piloter les interrupteurs T1 et respectivement T2. Le générateur il de courant délivre un niveau de courant haut 12A ou un niveau de courant bas 12B en fonction d'un signal de commutation ou d'une consigne de courant commutable fournie par l'organe de commande 10.The controller 10 has inputs 10a, 10b connected to the circuit upstream of the current generator il and respectively at a point of the circuit close to the capacity Ci to detect the voltage V and respectively the voltage VC1 of the capacity; it has outputs 10c, 10d to drive the switches T1 and T2 respectively. The current generator delivers a high current level 12A or a low current level 12B depending a switching signal or a switchable current setpoint supplied by the control unit 10.

Le fonctionnement du circuit de commande va être expliqué en regard de la figure 2.The operation of the control circuit will be explained with reference to the figure 2.

L'interrupteur S est initialement ouvert, de sorte que l'électroaimant est désactivé et que les contacts du contacteur sont ouverts ; l'interrupteur S est fermé à l'instant t0 pour activer l'électroaimant afin de fermer les contacts du contacteur.Switch S is initially open, so that the solenoid is deactivated and that the contactor contacts are open; switch S is closed at time t0 to activate the electromagnet in order to close the contacts of the contactor.

Dès que l'organe de commande détecte à son entrée 10a une tension suffisante au niveau des bornes A1,A2, il déclenche la phase d'appel en rendant T1 passant, tout en maintenant T2 bloqué, de sorte que la capacité Ci se charge (figure 2-A).As soon as the control member detects a sufficient voltage at its input 10a at terminals A1, A2, it triggers the call phase by making T1 passing, while keeping T2 blocked, so that the capacity Ci load (figure 2-A).

A l'instant t1, l'organe de commande détecte à son entrée 10b une tension suffisante de charge de la capacité C1, et en conséquence il bloque T1 et rend T2 passant (figures 2-B et 2-D). Il en résulte que la capacité C1 se décharge dans la bobine L1 (figure 2-C), tandis que la bobine L2 est directement alimentée par le générateur de courant 11 (partie gauche de la figure 2-E). L'énergie alors fournie conjointement par les bobines Ll et L2 permet de fermer les contacts du contacteur.At time t1, the control device detects a voltage at its input 10b sufficient charge of capacity C1, and consequently it blocks T1 and makes T2 pass (Figures 2-B and 2-D). As a result, the capacity C1 discharges in the coil L1 (figure 2-C), while the coil L2 is directly powered by the current generator 11 (left part of the figure 2-E). The energy then supplied jointly by the coils L1 and L2 allows to close the contactor contacts.

La fin t2 de la phase d'appel est déterminée par l'organe 10 qui laisse les transistors T1,T2 dans l'état précédent et qui transmet au générateur de courant il un signal de changement de consigne, celle-ci passant par exemple de 100 mA à 50 mA pour réduire la consommation d'énergie du circuit de commande au maintien (voir partie droite de la figure 2-E). Pour faire retomber l'électroaimant, la désalimentation de la bobine L2 est ensuite commandée à l'instant t3 par ouverture de l'interrupteur S.The end t2 of the call phase is determined by the member 10 which leaves the transistors T1, T2 in the previous state and which transmits to the generator current there a setpoint change signal, the latter passing through example from 100 mA to 50 mA to reduce the energy consumption of the holding control circuit (see right part of Figure 2-E). For drop the electromagnet, the L2 coil is then de-energized controlled at time t3 by opening the switch S.

Claims (4)

Circuit de commande pour électroaimant du type comprenant une première bobine et une deuxième bobine mises en oeuvre pour déterminer une phase d'appel et une phase de maintien, et comprenant une source d'énergie à tension continue pour alimenter les bobines, ainsi qu'au moins un interrupteur associé aux bobines pour y commander le passage du courant,
caractérisé par le fait que : la source d'énergie comprend un générateur de courant (11) et une capacité (C1) alimentée par ce générateur de courant, le circuit comporte un organe de commande (10) qui pilote un premier interrupteur (T1) et un deuxième interrupteur (T2), le premier interrupteur (T1) commandant pendant la phase d'appel la décharge de la capacité (C1) dans la première bobine (L1), la deuxième bobine (L2) est alimentée par le générateur de courant (11) via le deuxième interrupteur (T2), celui-ci établissant pendant la phase d'appel et pendant la phase de maintien, - et respectivement interrompant à la retombée -, le passage du courant dans la deuxième bobine (L2). Control circuit for an electromagnet of the type comprising a first coil and a second coil used to determine a call phase and a holding phase, and comprising a DC voltage power source for supplying the coils, as well as to the minus a switch associated with the coils to control the flow of current there,
characterized by the fact that: the energy source comprises a current generator (11) and a capacity (C1) supplied by this current generator, the circuit comprises a control member (10) which controls a first switch (T1) and a second switch (T2), the first switch (T1) controlling during the call phase the discharge of the capacity (C1) in the first coil (L1), the second coil (L2) is supplied by the current generator (11) via the second switch (T2), this establishing during the call phase and during the hold phase, - and respectively interrupting the fallout -, the passage of current in the second coil (L2). Circuit selon la revendication 1, caractérisé par le fait que le premier interrupteur (T1) est situé entre le générateur de courant (11) et la capacité (C1) et est relié au générateur de courant via une diode antiretour (D1).Circuit according to Claim 1, characterized in that the first switch (T1) is located between the current generator (11) and the capacitor (C1) and is connected to the current generator via a non-return diode (D1). Circuit selon la revendication 1, caractérisé par le fait que le deuxième interrupteur (T2) est placé en série avec le montage parallèle des deux bobines (L1,L2) et est fermé pendant la phase d'appel et pendant la phase de maintien.Circuit according to Claim 1, characterized in that the second switch (T2) is placed in series with the parallel mounting of the two coils (L1, L2) and is closed during the call phase and during the holding phase. Circuit selon la revendication 1, caractérisé par le fait que le générateur de courant (11) délivre un niveau de courant réglable et que l'organe de commande (10) est connecté au générateur de courant (il) pour lui transmettre une consigne de courant différente pendant la phase d'appel et pendant la phase de maintien.Circuit according to Claim 1, characterized in that the current generator (11) delivers an adjustable current level and that the control member (10) is connected to the current generator (il) to transmit a current setpoint to it different during the call phase and during the hold phase.
EP98402623A 1997-10-24 1998-10-21 Control circuit for an electromagnet Withdrawn EP0911840A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9713480 1997-10-24
FR9713480A FR2770332B1 (en) 1997-10-24 1997-10-24 ELECTROMAGNET CONTROL CIRCUIT

Publications (2)

Publication Number Publication Date
EP0911840A2 true EP0911840A2 (en) 1999-04-28
EP0911840A3 EP0911840A3 (en) 1999-06-16

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Application Number Title Priority Date Filing Date
EP98402623A Withdrawn EP0911840A3 (en) 1997-10-24 1998-10-21 Control circuit for an electromagnet

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US (1) US6101082A (en)
EP (1) EP0911840A3 (en)
JP (1) JPH11213831A (en)
FR (1) FR2770332B1 (en)

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Publication number Priority date Publication date Assignee Title
EP1065677A3 (en) * 1999-06-30 2001-12-12 Denso Corporation Electromagnetic load control apparatus having variable drive-starting energy supply
EP2385533A3 (en) * 2010-05-06 2017-11-15 K.A. Schmersal Holding KG Holder with an electromagnet

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DE19948632B4 (en) * 1999-10-08 2005-08-11 Siemens Ag Actuator with a basic actuator, a Zusatzaktor and a drive unit
US6556413B1 (en) * 1999-12-30 2003-04-29 Square D Company Method of providing electrical current to a contactor circuit
US6497221B1 (en) * 2000-11-06 2002-12-24 Robert Bosch Corporation Feedback tailoring of fuel injector drive signal
EP3127213B1 (en) * 2014-04-04 2020-07-15 Schneider Electric IT Corporation Systems and methods for quick power delivery mode changes

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US3689808A (en) * 1969-10-24 1972-09-05 Lucifer Sa Control system for an electromagnet
EP0196960A1 (en) * 1985-03-28 1986-10-08 Regie Nationale Des Usines Renault Fast acting control device for electromagnetic devices

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US5510951A (en) * 1994-08-01 1996-04-23 Eaton Corporation Electronic control for 3-wire DC coils
US5592356A (en) * 1994-09-27 1997-01-07 Synchro-Start Products, Inc. Dual coil actuator with timing circuit
US5717562A (en) * 1996-10-15 1998-02-10 Caterpillar Inc. Solenoid injector driver circuit

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
US3689808A (en) * 1969-10-24 1972-09-05 Lucifer Sa Control system for an electromagnet
EP0196960A1 (en) * 1985-03-28 1986-10-08 Regie Nationale Des Usines Renault Fast acting control device for electromagnetic devices

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1065677A3 (en) * 1999-06-30 2001-12-12 Denso Corporation Electromagnetic load control apparatus having variable drive-starting energy supply
US6407593B1 (en) 1999-06-30 2002-06-18 Denso Corporation Electromagnetic load control apparatus having variable drive-starting energy supply
EP1288974A2 (en) * 1999-06-30 2003-03-05 Denso Corporation Electromagnetic load control apparatus having variable drive-starting energy supply
EP1288974A3 (en) * 1999-06-30 2003-06-04 Denso Corporation Electromagnetic load control apparatus having variable drive-starting energy supply
EP2385533A3 (en) * 2010-05-06 2017-11-15 K.A. Schmersal Holding KG Holder with an electromagnet

Also Published As

Publication number Publication date
FR2770332A1 (en) 1999-04-30
FR2770332B1 (en) 1999-12-03
US6101082A (en) 2000-08-08
EP0911840A3 (en) 1999-06-16
JPH11213831A (en) 1999-08-06

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