EP0005734A1 - Electromagnetically operated switch gear - Google Patents

Electromagnetically operated switch gear Download PDF

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Publication number
EP0005734A1
EP0005734A1 EP79101309A EP79101309A EP0005734A1 EP 0005734 A1 EP0005734 A1 EP 0005734A1 EP 79101309 A EP79101309 A EP 79101309A EP 79101309 A EP79101309 A EP 79101309A EP 0005734 A1 EP0005734 A1 EP 0005734A1
Authority
EP
European Patent Office
Prior art keywords
switching device
magnetic
middle leg
armature
pole faces
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Withdrawn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
EP79101309A
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German (de)
French (fr)
Inventor
Torvald Dipl.-Ing. Larsson
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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 ASEA AB filed Critical ASEA AB
Publication of EP0005734A1 publication Critical patent/EP0005734A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/163—Details concerning air-gaps, e.g. anti-remanence, damping, anti-corrosion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • H01H50/20—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil
    • H01H50/22—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil wherein the magnetic circuit is substantially closed
    • H01H2050/225—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil wherein the magnetic circuit is substantially closed with yoke and armature formed by identical stacked laminates, e.g. punched in one and the same tool
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • H01H50/20—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil
    • H01H50/22—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil wherein the magnetic circuit is substantially closed
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/44—Magnetic coils or windings
    • H01H50/46—Short-circuited conducting sleeves, bands, or discs

Definitions

  • the present invention relates to an electromagnetically actuated switching device according to the preamble of claim 1.
  • the switching device can be, for example, a contactor.
  • contactors are already known in which the magnetic core and the armature are constructed from exactly the same sheets in order to simplify the manufacture.
  • it was not possible to achieve complete equality between the magnetic core and the armature since the grinding to produce the remanent air gap is carried out only on one of the magnetic parts. This is because it is easier to adhere to certain manufacturing tolerances if the grinding is only carried out on one of the magnetic parts.
  • the dimensions of the pathogen To keep the coil small, the retentive air gap must be relatively small (for example 0.15 mm) and with small tolerances, usually + 0.02 mm. If the remanent air gap is created by grinding only one of the magnetic parts, then this grinding can be carried out with a tolerance of + 0.02 mm.
  • a disadvantage of the previous practice of grinding the middle leg is that the magnetic part in question must be ground in two different planes, namely in one plane for the pole faces of the two outer legs and in another plane for the pole face of the middle leg.
  • the present invention has for its object to develop an electromagnetically actuated switching device of the type mentioned, in which the core and armature are exactly the same, without having to place higher demands on the manufacturing tolerances for the remanent air gap than before, and in which each magnetic part has only one grinding plane.
  • an electromagnetically actuated switching device according to the preamble of claim 1 is proposed, which according to the invention has the features mentioned in the characterizing part of claim 1.
  • the magnetic core and the armature can be manufactured with the same manufacturing device without changing over, without the requirements for the manufacturing tolerance needing to be increased.
  • the contactor shown in Figure 1 has a housing 1 made of plastic material.
  • the contactor is multi-pole, and each pole contains two fixed contacts 2 and 3 and a movable contact bridge 4 that can be connected to them.
  • the movable contact bridge 4 is fastened in a contact bridge support 5 and is acted upon by a contact pressure spring 6.
  • the contact bridge support 5 is coupled to an E-shaped armature 7 of the switching magnet of the contactor, the magnetic core 8 of which carries the excitation coil 9.
  • the magnetic parts 7 and 8 are constructed in a known manner from sheet metal lamellae which are pressed together by means of rivets 14.
  • the armature 7 and the magnetic core 8 are exactly the same with each other, and each of these parts carries a short-circuit ring 10 and 11 on an outer leg lie, while between the pole faces 12 and 13 of the middle leg there is a remanent air gap d of, for example, 0.15 mm.
  • Each of these pole faces consists of two different partial surfaces lying in parallel planes. r
  • the respectively offset partial surfaces 12a and 13a are ground and lie in the same plane as the pole surfaces of the outer legs, while the recessed partial surfaces 12b and 13b are formed by the uncut, stamped edge surfaces of the sheets. This design ensures that the two magnetic parts can be ground in exactly the same way, without the tolerance requirement for each grinding having to be increased with respect to what applies to the entire remanent air gap.
  • the offset partial surfaces 12a, 13a must be 1 to 2 mm narrower than the recessed partial surfaces 12b, 13b (dimension c in FIG. 2).

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)

Abstract

An electromagnetically operated switchgear, e.g. an electrical contactor, has a magnetic iron core which consists of two identical E- shaped magnet parts, specifically the magnet core (8), carrying the winding, and the armature (7). A remanence air gap (d) is provided between the pole surfaces of the centre limb of the two magnet parts. Each of these said pole surfaces consists of two joint faces (12a, 12b; 13a, 13b) lying in different parallel planes. <IMAGE>

Description

Die vorliegende Erfindung betrifft ein elektromagnetisch betätigtes Schaltgerät gemäß dem Oberbegriff des Anspruches 1. Bei dem Schaltgerät kann es sich beispielsweise um ein Schütz handeln,The present invention relates to an electromagnetically actuated switching device according to the preamble of claim 1. The switching device can be, for example, a contactor.

Um ein magnetisches Kleben des Ankers am Schaltmagneten zu verhindern, ist es bekannt, einen sogenannten Remanenzluftspalt in dem vom Eisen gebildeten magnetischen Kreis vorzusehen. Bei E-förmigen Magnetteilen wird dies in der.Regel dadurch verwirklicht, daß der Mittelschenkel des einen Magnetteils, also des die Wicklung tragenden Magnetkerns oder des Ankers, durch Schleifen verkürzt wird.In order to prevent the armature from sticking magnetically to the switching magnet, it is known to provide a so-called residual air gap in the magnetic circuit formed by the iron. In the case of E-shaped magnetic parts, this is generally achieved by shortening the middle leg of one magnetic part, that is to say the magnetic core or armature carrying the winding, by grinding.

Aus der DE-AS 1 237 204 sind bereits Schütze bekannt, bei denen zwecks Vereinfachung der Herstellung der Magnetkern und der Anker aus exakt gleichen Blechen aufgebaut sind. Eine vollständige Gleichheit zwischen Magnetkern und Anker hat man hierbei jedoch nicht erreichen können, da das Abschleifen zur Erzeugung des Remanenzluftspaltes nur an dem einen der Magnetteile vorgenommen wird. Dies geschieht deshalb, weil es leichter ist, bestimmte Fertigungstoleranzen einzuhalten, wenn das Schleifen nur an dem einen der Magnetteile vorgenommen wird. Um die Maße der Erregerspule klein zu halten, muß der Remanenzluftspalt nämlich verhältnismäßig klein sein (beispielsweise 0,15 mm) und mit kleinen Toleranzen, in der Regel + 0,02 mm, ausgeführt werden. Wenn der Remanenzluftspalt durch Schleifen an nur einem der Magnetteile hergestellt wird, dann kann dieses Schleifen mit einer Toleranz von + 0,02 mm ausgeführt werden. Wenn dagegen der Remanenzluftspalt durch Schleifen am Mittelschenkel von Anker und Magnetkern hergestellt wird (mit 0,075 mm pro Magnetteil), so muß jeder Schleifvorgang mit der halben Toleranz, nämlich + 0,01 mm, durchgeführt werden. Dies würde die Fertigung erschweren und verteuern.From DE-AS 1 237 204, contactors are already known in which the magnetic core and the armature are constructed from exactly the same sheets in order to simplify the manufacture. However, it was not possible to achieve complete equality between the magnetic core and the armature, since the grinding to produce the remanent air gap is carried out only on one of the magnetic parts. This is because it is easier to adhere to certain manufacturing tolerances if the grinding is only carried out on one of the magnetic parts. The dimensions of the pathogen To keep the coil small, the retentive air gap must be relatively small (for example 0.15 mm) and with small tolerances, usually + 0.02 mm. If the remanent air gap is created by grinding only one of the magnetic parts, then this grinding can be carried out with a tolerance of + 0.02 mm. If, on the other hand, the residual air gap is created by grinding the middle leg of the armature and magnetic core (with 0.075 mm per magnetic part), then every grinding process must be carried out with half the tolerance, namely + 0.01 mm. This would make production more difficult and more expensive.

Ein Nachteil des bisher praktizierten Abschleifens des Mittelschenkels besteht im übrigen darin, daß der betreffende Magnetteil in zwei verschiedenen Ebenen geschliffen werden muß, nämlich in einer Ebene für die Polflächen der beiden Außenschenkel und in einer anderen Ebene für die Polfläche des Mittelschenkels.A disadvantage of the previous practice of grinding the middle leg is that the magnetic part in question must be ground in two different planes, namely in one plane for the pole faces of the two outer legs and in another plane for the pole face of the middle leg.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein elektromagnetisch betätigtes Schaltgerät der eingangs genannten Art zu entwickeln, bei dem Kern und Anker exakt gleich sind, ohne daß an die Fertigungstoleranzen für den Remanenzluftspalt höhere Forderungen als bisher gestellt werden müssen, und bei dem jedes Magnetteil jeweils nur eine einzige Schleifebene hat.The present invention has for its object to develop an electromagnetically actuated switching device of the type mentioned, in which the core and armature are exactly the same, without having to place higher demands on the manufacturing tolerances for the remanent air gap than before, and in which each magnetic part has only one grinding plane.

Zur Lösung dieser Aufgabe wird ein elektromagnetisch betätigtes Schaltgerät nach dem Oberbegriff des Anspruches 1 vorgeschlagen, welches erfindungsgemäß die im kennzeichnenden Teil des Anspruches 1 genannten Merkmale hat.To solve this problem, an electromagnetically actuated switching device according to the preamble of claim 1 is proposed, which according to the invention has the features mentioned in the characterizing part of claim 1.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen genannt.Advantageous developments of the invention are mentioned in the subclaims.

Durch die Erfindung wird erreicht, daß mit derselben Herstellungseinrichtung ohne Umstellung der Magnetkern und der Anker hergestellt werden können, ohne daß die Anforderungen an die Herstellungstoleranz erhöht zu werden brauchen.It is achieved by the invention that the magnetic core and the armature can be manufactured with the same manufacturing device without changing over, without the requirements for the manufacturing tolerance needing to be increased.

Anhand des in den Figuren gezeigten Ausführungsbeispieles soll die Erfindung näher erläutert werden. Es zeigen

  • Fig. 1 ein in Ausschaltstellung befindliches Schütz gemäß der Erfindung in seitlicher Schnittansicht,
  • Fig. 2 die nackten beiden Magnetteile Kern und Anker des Schützes in Einschaltstellung,
  • Fig. 3 eines der Magnetteile in einer senkrecht zu den Polflächen gerichteten Ansicht.
Based on the embodiment shown in the figures, the invention will be explained in more detail. Show it
  • 1 is a contactor in the off position according to the invention in side sectional view,
  • 2 the bare two magnetic parts core and armature of the contactor in the switched-on position,
  • Fig. 3 one of the magnetic parts in a view directed perpendicular to the pole faces.

Das in Figur 1 gezeigte Schütz hat ein Gehäuse 1 aus Kunststoffmaterial. Das Schütz ist mehrpolig, und jeder Pol enthält zwei feste Kontakte 2 und 3 sowie eine mit diesen verbindbare bewegliche Kontaktbrücke 4. Die bewegliche Kontaktbrücke 4 ist in einem Kontaktbrückenträger 5 befestigt und wird von einer Kontaktdruckfeder 6 beaufschlagt. Der Kontaktbrückenträger 5 ist an einen E-förmigen Anker 7 des Schaltmagneten des SchUtzes gekuppelt, dessen Magnetkern 8 die Erregerspule 9 trägt. Die Magnetteile 7 und 8 sind in bekannter Weise aus Blechlamellen aufgebaut, die mittels Niete 14 zusammengepresst sind.The contactor shown in Figure 1 has a housing 1 made of plastic material. The contactor is multi-pole, and each pole contains two fixed contacts 2 and 3 and a movable contact bridge 4 that can be connected to them. The movable contact bridge 4 is fastened in a contact bridge support 5 and is acted upon by a contact pressure spring 6. The contact bridge support 5 is coupled to an E-shaped armature 7 of the switching magnet of the contactor, the magnetic core 8 of which carries the excitation coil 9. The magnetic parts 7 and 8 are constructed in a known manner from sheet metal lamellae which are pressed together by means of rivets 14.

Der Anker 7 und der Magnetkern 8 sind untereinander exakt gleich, und jedes dieser Teile trägt auf einem Außenschenkel einen Kurzschlußring 10 bzw. 11. Die Außenschenkel der Magnetteile haben plangeschliffene Polflächen, die in Einschaltstellung des SchUtzes (Fig. 2) aneinander liegen, während zwischen den Polflächen 12 und 13 der Mittelschenkel ein Remanenzluftspalt d von beispielsweise 0,15mm vorhanden ist. Jede dieser Polflächen besteht aus zwei verschiedenen parallelen Ebenen liegenden Teilflächen. r Die jeweils vorversetzten Teilflächen 12a und 13a sind geschliffen und liegen in derselben Ebene wie die Polflächen der Außenschenkel, während die zurückversetzten Teilflächen 12b und 13b von den ungeschliffenen gestanzten Randflächen der Bleche gebildet werden. Durch diese Ausführung wird erreicht, daß die beiden Magnetteile auf exakt die gleiche Art geschliffen werden können, ohne daß die Toleranzforderung bei jedem Schleifen gegenüber dem, was für den ganzen Remanenzluftspalt gilt, erhöht zu werden braucht.The armature 7 and the magnetic core 8 are exactly the same with each other, and each of these parts carries a short-circuit ring 10 and 11 on an outer leg lie, while between the pole faces 12 and 13 of the middle leg there is a remanent air gap d of, for example, 0.15 mm. Each of these pole faces consists of two different partial surfaces lying in parallel planes. r The respectively offset partial surfaces 12a and 13a are ground and lie in the same plane as the pole surfaces of the outer legs, while the recessed partial surfaces 12b and 13b are formed by the uncut, stamped edge surfaces of the sheets. This design ensures that the two magnetic parts can be ground in exactly the same way, without the tolerance requirement for each grinding having to be increased with respect to what applies to the entire remanent air gap.

Im Hinblick auf das Spiel, der zwischen dem Magneten und dem Gehäuse des Schützes vorhanden sein muß, müssen die vorversetzten Teilflächen 12a, 13a 1 bis 2 mm schmaler sein als die zurückversetzten Teilflächen 12b, 13b (Maß c in Fig. 2).With regard to the play that must exist between the magnet and the housing of the contactor, the offset partial surfaces 12a, 13a must be 1 to 2 mm narrower than the recessed partial surfaces 12b, 13b (dimension c in FIG. 2).

Claims (4)

1. Elektromagnetisch betätigtes Schaltgerät mit einem Schaltmagneten, der ein festes und ein bewegliches Magnetteil, Magnetkern (8) und Anker (7), enthält, die E-förmig und exakt gleich sind, wobei in der Einschaltstellung des Schaltgerätes zwischen den Polflächen (12, 13) der Mittelschenkel der Magnetteile (7, 8) ein Remanenzluftspalt (d) vorhanden ist,
dadurch gekennzeichnet,
daß bei beiden Magnetteilen (7, 8) die Polflächen des Mittelschenkels aus zwei in verschiedenen parallelen Ebenen liegenden Teilflächen (12a, 12b; 13a, 13b) be- . steht.1. Electromagnetically actuated switching device with a switching magnet that contains a fixed and a movable magnetic part, magnetic core (8) and armature (7), which are E-shaped and exactly the same, with the switching device between the pole faces (12, 13) there is a remanent air gap (d) in the middle leg of the magnetic parts (7, 8),
characterized,
that with both magnetic parts (7, 8) the pole faces of the middle leg consist of two partial surfaces (12a, 12b; 13a, 13b) lying in different parallel planes. stands. 2. Schaltgerät nach Anspruch 1,
dadurch gekennzeichnet,
daß der Querschnitt jeder Teilfläche nahezu halb so groß ist wie der Querschnitt des Mittelschenkels.2. Switching device according to claim 1,
characterized,
that the cross section of each partial area is almost half as large as the cross section of the middle leg. 3. Schaltgerät nach Anspruch1 oder 2,
dadurch gekennzeichnet,
daß die vorversetzte Teilfläche (12a, 13a) des Mittelschenkels in derselben Ebene wie die Polflächen der Außenschenkel liegt.3. Switching device according to claim 1 or 2,
characterized,
that the offset partial surface (12a, 13a) of the middle leg lies in the same plane as the pole faces of the outer legs. 4. Schaltgerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet,
daß ein Außenschenkel jedes Magnetteils (7, 8) einen Kurzschlußring (10) trägt.4. Switching device according to one of the preceding claims, characterized in that
that an outer leg of each magnetic part (7, 8) carries a short-circuit ring (10).
EP79101309A 1978-05-02 1979-05-01 Electromagnetically operated switch gear Withdrawn EP0005734A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7804996 1978-05-02
SE7804996A SE411272B (en) 1978-05-02 1978-05-02 ELECTROMAGNETICALLY MANUFACTURED ELECTRICAL COUPLER

Publications (1)

Publication Number Publication Date
EP0005734A1 true EP0005734A1 (en) 1979-12-12

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Application Number Title Priority Date Filing Date
EP79101309A Withdrawn EP0005734A1 (en) 1978-05-02 1979-05-01 Electromagnetically operated switch gear

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EP (1) EP0005734A1 (en)
DK (1) DK179679A (en)
FI (1) FI791389A (en)
SE (1) SE411272B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160121A1 (en) * 1984-03-31 1985-11-06 Square D Company (Deutschland) Gmbh Electromagnet for electrical switching devices, particularly for contactors
DE10214992A1 (en) * 2002-04-05 2003-10-16 Moeller Gmbh AC electromagnet

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1237204B (en) * 1959-06-29 1967-03-23 Es Eupen Atelier De Const Elec Attachment of a contact bridge to the armature of an electromagnetic contactor
DE1295085B (en) * 1961-06-08 1969-05-14 Elektro App Werke Veb E-shaped magnetic core for highly stressed switchgear
GB1191698A (en) * 1966-07-27 1970-05-13 Cem Comp Electro Mec Improvements in or relating to Electro-Magnetically Operable Contactors
DE1810250B2 (en) * 1968-04-20 1972-12-07 VEB Kombinat Schaltelektronik, x8717Oppach ELECTROMAGNET WITH TWO E-SHAPED CORE PARTS
DE2658456A1 (en) * 1976-12-23 1978-06-29 Licentia Gmbh TWO-PIECE MAGNETIC CORE

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1237204B (en) * 1959-06-29 1967-03-23 Es Eupen Atelier De Const Elec Attachment of a contact bridge to the armature of an electromagnetic contactor
DE1295085B (en) * 1961-06-08 1969-05-14 Elektro App Werke Veb E-shaped magnetic core for highly stressed switchgear
GB1191698A (en) * 1966-07-27 1970-05-13 Cem Comp Electro Mec Improvements in or relating to Electro-Magnetically Operable Contactors
DE1810250B2 (en) * 1968-04-20 1972-12-07 VEB Kombinat Schaltelektronik, x8717Oppach ELECTROMAGNET WITH TWO E-SHAPED CORE PARTS
DE2658456A1 (en) * 1976-12-23 1978-06-29 Licentia Gmbh TWO-PIECE MAGNETIC CORE

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160121A1 (en) * 1984-03-31 1985-11-06 Square D Company (Deutschland) Gmbh Electromagnet for electrical switching devices, particularly for contactors
US4577174A (en) * 1984-03-31 1986-03-18 Square D Starkstrom Gmbh Electromagnet for electric switching device
DE10214992A1 (en) * 2002-04-05 2003-10-16 Moeller Gmbh AC electromagnet

Also Published As

Publication number Publication date
SE7804996L (en) 1979-11-03
SE411272B (en) 1979-12-10
FI791389A (en) 1979-11-03
DK179679A (en) 1979-11-03

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