EP0187055B1 - Polarisiertes elektromagnetisches Relais mit magnetischer Sperrung für einen Auslöser eines Schutzschalters - Google Patents

Polarisiertes elektromagnetisches Relais mit magnetischer Sperrung für einen Auslöser eines Schutzschalters Download PDF

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Publication number
EP0187055B1
EP0187055B1 EP85402117A EP85402117A EP0187055B1 EP 0187055 B1 EP0187055 B1 EP 0187055B1 EP 85402117 A EP85402117 A EP 85402117A EP 85402117 A EP85402117 A EP 85402117A EP 0187055 B1 EP0187055 B1 EP 0187055B1
Authority
EP
European Patent Office
Prior art keywords
armature
flange
flux
frame
diverter
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.)
Expired
Application number
EP85402117A
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English (en)
French (fr)
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EP0187055A1 (de
Inventor
Pierre Schueller
Michel Bonniau
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.)
Merlin Gerin SA
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Merlin Gerin SA
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 Merlin Gerin SA filed Critical Merlin Gerin SA
Priority to AT85402117T priority Critical patent/ATE44631T1/de
Publication of EP0187055A1 publication Critical patent/EP0187055A1/de
Application granted granted Critical
Publication of EP0187055B1 publication Critical patent/EP0187055B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/32—Electromagnetic mechanisms having permanently magnetised part
    • H01H71/321—Electromagnetic mechanisms having permanently magnetised part characterised by the magnetic circuit or active magnetic elements
    • H01H71/322—Electromagnetic mechanisms having permanently magnetised part characterised by the magnetic circuit or active magnetic elements with plunger type armature

Definitions

  • the return spring of the movable armature can be arranged outside the magnetic circuit, and the axial length of the coil is less than that of the permanent magnet.
  • the high reluctance of the magnetic circuit in the hooking position of the armature requires a large control flow which increases the tripping energy of the coil.
  • the return spring of the armature is incorporated in the relay, and the magnetic circuit also has a high reluctance in the position in which the relay is hooked.
  • the object of the invention is to remedy these drawbacks and to enable the production of a tripping relay with high sensitivity and reduced bulk.
  • the relay according to the invention is characterized in that the second flange of the magnetic circuit is equipped with a fixed internal machon of tubular shape made of ferromagnetic material, extending parallel in an annular space formed coaxially between the sheath and the armature mobile, the latter being separated from said sleeve by a second radial air gap remaining uniform during the translational movement of the armature, and that the distance of axial overlap of the armature by the sleeve in the position of attachment of the relay is greater than l 'thickness of the second flange and / or that of the cylinder head.
  • the presence of the ferromagnetic sleeve around the armature decreases the reluctance of the magnetic circuit resulting in a reduction in the control flow of the coil. This results in an increase in the sensitivity of the relay and a decrease in the tripping energy.
  • means for guiding in axial translation of the movable assembly determine a predetermined radial clearance with the movable frame, the thickness of said clearance being less than that of the second radial air gap arranged between the sleeve and the frame.
  • the means for guiding the armature may be constituted either by an annular collar coming from molding with the insulating sheath of the coil, or by a non-magnetic sleeve, in particular made of brass, interposed axially between the sleeve and the shunt.
  • the shunt is saturable, and extends radially in a direction parallel to the first flange to come into contact with the internal lateral surface of the cylinder head, the thickness of said shunt in its narrowest part being less than the thickness of the permanent magnet and / or that of the cylinder head.
  • the return spring is of the compression type and the armature is provided with an axial blind hole for housing a part of said spring, the latter passing through the annular shunt and permanent magnet bearing on its opposite end on a central boss of the first flange.
  • the external radius of the annular permanent magnet is greater than its thickness, the latter corresponding to the axial distance separating the first flange and the shunt.
  • the axial length occupied by the coil is at least more than half the total length of the relay.
  • the dimensions of the magnet, the shunt and the coil can of course be modified according to the triggering characteristics.
  • an electromagnetic high-sensitivity tripping relay 10 for an electrical circuit breaker comprises a fixed magnetic circuit 12 polarized by a permanent magnet 14 and cooperating with a sliding armature 16 associated with an actuating member 18.
  • the circuit magnetic 12 is formed by a ferromagnetic yoke 20 in the form of a cylindrical shell closed at its opposite ends by a pair of disc flanges 22, 24.
  • the permanent magnet 14 with axial magnetization is housed inside the yoke 20 and has an annular shape with coplanar front surfaces of opposite polarities coming into contact respectively with the internal wall of the first flange 22 and one of the parallel faces d a shunt 26 for distributing the magnetic flux.
  • the two flanges 22, 24 and the shunt 26 are made of ferromagnetic material and the external radius of the permanent magnet 14 is greater than its thickness corresponding to the axial distance separating the first flange 22 from the shunt 26.
  • the latter extends radially towards the internal lateral surface of the cylinder head 20 and comprises an annular extension 28 cooperating with the movable frame 16 of cylindrical shape.
  • a control coil 30 is mounted coaxially in a cylindrical sheath 32 of insulating material, inside the cylinder head 20, extending axially between the shunt 26 and the second flange 24.
  • the movable frame 16 is formed by a core plunger mounted with alternating axial sliding inside the cylindrical sheath 32 between a first hooking position and a second tripping position.
  • the core of the frame 16 is provided with a blind axial hole 34 for housing a return spring 36 of the compression type supported by its opposite end on a central boss 38 of the first flange 22.
  • the spring 36 passes through axially the permanent magnet 14 and the shunt 26, and biases the armature 16 movable towards the second release position. During its detent movement towards the triggering position, the spring 36 is guided in translation by the cylindrical wall of the hole 34.
  • the actuating member 18 is provided with a striker or tubular pusher fitted on an axial extension 40 of the armature 16 and intended to cooperate with a lock (not shown) of a mechanism, respectively when triggered by excitation of the coil 30, and during a resetting of the relay 10 causing the return of the armature 16 to the first hooking position.
  • the actuating member 18 is made of plastic insulating material and passes axially through a circular opening 42 formed in the second flange 24.
  • the frame 16 moves in a first variable axial air gap (d), which is zero when the frame 16 is glued against the extension 28 of the shunt 26, and maximum when the frame 16 is in the tripping position.
  • the frame 16 and the actuating member 18 constitute the movable assembly cooperating with guide means in axial translation formed on the one hand by an annular flange 44, arranged around the frame 16, said flange 44 coming from molding with the fixed sleeve 32 for supporting the coil 30, and on the other hand by the circular opening 42 of the flange 24 serving as bearing for the striker 18.
  • the second flange 24 is equipped with an internal tubular sleeve 46 made of ferromagnetic material, extending up to the collar 44 in an annular space delimited radially by the cylindrical sheath 32 and the frame 16.
  • the sleeve 46 coaxially surrounds the frame 16 with interposition of a second predetermined radial air gap (j1) whose thickness is greater than the guide clearance (j2) arranged between the flange 44 and the frame 16.
  • This difference in ribs between the air gap j1 and the clearance j2 is essential to maintain the uniformity of the radial j1 air gap during the translation of the moving assembly in the axial direction, and to avoid any magnetic attraction against the sleeve 46 liable to oppose the free sliding of the frame 16.
  • a radial lug 48 of the insulating sheath 32 projects from a notch 50 in the cylinder head 20 and serves simultaneously as a member for blocking the rotation of the coil 30, and as a connection support for the wires 52, 54 for connecting the coil 30
  • An elastic strip 56 of curved shape is interposed between one of the front faces of the coil 30 and the second flange 24 to ensure the automatic take-up of the axial play when the various constituent elements of the relay 10 are stacked. elastic comes directly from molding with the insulating sheath 32 of the coil 30.
  • the insulating actuating member 18 can have any shape depending on the structure of the trip unit lock, and / or the size of the circuit breaker.
  • the thickness of the shunt 26 in its narrowest part located around the extension 28 is less than the thickness (12) of the yoke 20 and that of the magnet 14.
  • the axial length of the coil 30 is very large with respect to the thickness of the permanent magnet 14.
  • the interstice of the second radial air gap (j1) is less than the thickness (11) of the second flange 24.
  • the coil 30 In the triggered position of the movable frame 16, the coil 30 is not supplied, and all of the flux generated by the permanent magnet 14 circulates in the narrowed part of the shunt 26, a portion of the yoke 20, arranged coaxially around of the magnet 14, and the first flange 22.
  • the shunt 26 is saturated, and no flux circulates in the rest of the magnetic circuit 12.
  • the movable armature 16 moves in translation in the first axial gap (d), and abuts against the pole surface of the extension 28 of the shunt 26.
  • the spring 36 is then in the compressed state.
  • the flux of the permanent magnet 14 is divided into two elementary fluxes ⁇ s and ⁇ u (see fig.
  • the magnetic flux ⁇ C of the coil 30 is opposed in the axial air gap (d) to the flux of polarization ⁇ U of the permanent magnet 14, and weakens the force of attraction of the armature 16.
  • the armature 16 is driven upwards, up to the triggering position in which the striker 18 causes the mechanism to be unlocked.
  • the path of the control flow ⁇ C (see fig.
  • the coaxial arrangement of the tubular sleeve 46 around the frame 16 determines a large section causing a minimum reluctance of the magnetic circuit 12.
  • the ferromagnetic sleeve 46 In the armed position, the ferromagnetic sleeve 46 axially covers the frame 16 over a predetermined distance, the length L is greater than the thickness (11) of the second flange 24 as well as that (12) of the yoke 20.
  • the low reluctance of the magnetic circuit 12 due to the presence of the tubular sleeve 46 requires a control flow ⁇ C of low value allowing an increase in the sensitivity of the relay 10, and a decrease in the triggering energy of the coil 30.
  • the means for guiding in axial translation of the movable armature 16 comprise a non-magnetic sleeve 144, in particular made of brass, mounted coaxially inside the sheath 32 while being interposed between the sleeve 46 and the shunt 126.
  • the radial clearance ( j2) between the sleeve 144 and the frame 16 remains below the radial air gap (j1) formed between the sleeve 46 and the frame 16.
  • the shunt 126 is separated radially from the lateral surface of the cylinder head 20 by an interval ( e2) whose dimension is greater than the thickness (12) of the yoke 20, and the radial distance (e1) between the permanent magnet 14 and the yoke 20. All the other parts of the relay 100 are similar to those of fig. 1 and are assigned the same reference numbers.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Keying Circuit Devices (AREA)
  • Electromagnets (AREA)
  • Relay Circuits (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Magnetic Treatment Devices (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Switch Cases, Indication, And Locking (AREA)

Claims (10)

1. Polarisiertes elektromagnetisches Relais mit magnetischer Sperrung, insbesondere für eine Auslösevorrichtung eines Schutzschalters mit:
- einer festen Magnetschaltung (12) aus ferromagnetischem Material mit einem röhrenförmigen Joch (20), das an seinen entgegengesetzten Enden mit einem ersten und zweiten parallelen Flansch (22, 24) verbunden ist, die sich senkrecht zur Längsachse des Joches (20) erstrecken,
- einem ringförmigen Dauermagnet (14) mit Axial-Magnetisierung, dessen koplanare stirnseitige Oberflächen von entgegengesetzter Polarität mit der Innenwand des ersten Flansches (22) bzw. einer der Flächen eines Shunts (26, 126) zur Verteilung des Magnetflusses in Kontakt kommen,
- einem beweglichen Anker (16), der axial gleitbar montiert ist gemäss der Richtung der Längsachse zwischen einer Sperrlage und einer Auslöselage, wobei der genannte Anker (16) von einer Rückholfeder (36) in die Auslöselage gebracht wird, und sich in der Sperrlage gegen den Shunt (26) gedrückt befindet durch die magnetische Anziehungskraft des Dauermagneten (14) von höherer Intensität als die Gegenkraft der Rückholfeder (36),
-einem Betätigungselement (18), das mit dem Anker (16) verbunden ist und axial eine Öffnung (42) des zweiten Flansches (24) durchquert, wobei der Anker (16) und das Betätigungselement (18) das bewegliche Schaltteil des Relais (10) bilden, - einem ersten axialen Luftspalt (d), der dem Zwischenraum zwischen dem Shunt (26) und dem beweglichen Anker (16) entspricht,
- einer festen Steuerspule (30), die koaxial auf einer Isolierhülse (32) montiert ist, im Innern des Jochs (20) und den beweglichen Anker (16) umgebend und sich axial zwischen dem Shunt (26) und dem beweglichen Flansch (24) erstreckt, wobei die Erregung der genannten Spule (30) in der Magnetschaltung (12) einen Steuer-Magnetfluss (0c) erzeugt, der in dem ersten Luftspalt (d) dem Polarisationsfluss (0") des Dauermagneten (14) entgegenwirkt, so um den Anker (16) zu befreien und seine Bewegung von der Sperrlage in die Auslöselage unter Wirkung der Rückholfeder (36) zu ermöglichen,
dadurch gekennzeichnet, dass der zweite Flansch (24) der Magnetschaltung (12) mit einer festen inneren, röhrenförmigen Muffe (46) aus ferromagnetischem Material ausgerüstet ist, die sich teilweise in einem ringförmigen Raum erstreckt, der koaxial zwischen der Hülse (32) und dem beweglichen Anker (16) vorgesehen ist, wobei letzterer von der genannten Muffe (46) durch einen zweiten radialen Luftspalt (|1) getrennt ist, der während der geradlinigen Bewegung des Ankers (16) gleichförmig bleibt, und dass der Abstand (L) zur Axial-Überdeckung des Ankers (16) durch die Muffe (46) in der Sperrlage des Relais (10) grösser ist als die Dicke (11) des zweiten Flansches (24) und/oder die Dicke (12) des Jochs (20).
2. Elektromagnetisches Relais gemäss Anspruch 1, dadurch gekennzeichnet, dass die Führungsmittel zur Axialbewegung des beweglichen Schaltteils ein vorbestimmtes radiales Spiel (j2) mit dem beweglichen Anker (16) festlegen, wobei die Dicke des genannten Spiels (j2) geringer ist als die des zweiten radialen Luftspaltes 01), der zwischen der Muffe (46) und dem Anker (16) vorgesehen ist.
3. Elektromagnetisches Relais gemäss Anspruch 2, dadurch gekennzeichnet, dass die Bewegungs-Führungsmittel einen ringförmigen Kragen (44) aufweisen, der mit der Isolierhülse (32) der Spule (30) gegossen wird, und dass sich die genannte Muffe (46) axial bis in die Nähe des genannten Kragens (44) erstreckt.
4. Elektromagnetisches Relais gemäss Anspruch 2, dadurch gekennzeichnet, dass die Bewegungs-Führungsmittel mit einer unmagnetischen Hülle (144) versehen sind, die axial zwischen der Muffe (46) und dem Shunt (126) eingefügt ist.
5. Elektromagnetisches Relais gemäss einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Shunt (26) eine Sättigungscharakteristik aufweist und sich radial gemäss einer zum ersten Flansch (22) parallelen Richtung erstreckt, um mit der seitlichen inneren Oberfläche des Jochs (20) in Kontakt zu kommen, wobei die Dicke des genannten Shunts (26) in seinem engsten Teil geringer ist als die Dicke des Dauermagneten (14) und/oder der Dicke des Jochs (20).
6. Elektromagnetisches Relais gemäss einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Rückholfeder (36) von der Kompressionsart ist, und dass der Anker (16) mit einem blinden axialen Loch (34) versehen ist, zum Unterbringen eines Teils der genannten Feder (36), wobei letztere den Shunt (26) und den ringförmigen Dauermagneten (14) durchquert und sich dabei mit ihrem entgegengesetzten Ende auf eine zentrale Erhebung (38) des ersten Flansches (22) stützt.
7. Elektromagnetisches Relais gemäss Anspruch 6, dadurch gekennzeichnet, dass ein elastisches Plättchen (56) von gebogener Form zwischen einer der Stirnseiten der Spule (30) und dem zweiten Flansch (24) eingefügt ist, um automatisch das axiale Spiel bei der Montage der verschiedenen, das Relais (10) bildenden Elemente aufzuholen, und dass das genannte Plättchen (56) ein Teil der Isolierhülse (32) der Spule (30) ist.
8. Elektromagnetisches Relais gemäss Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Hülse (32) eine radiale Lasche (48) aufweist, die aus einem Schlitz (50) des Jochs (20) hervorragt, um gleichzeitig ein Sperrmittel für die Rotation der Spule (30) und einen Verbindungsträger der Anschlussdrähte der Spule (30) zu bilden.
9. Elektromagnetisches Relais gemäss einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der äussere Radius des ringförmigen Dauermagneten (14) grösser als seine Dicke ist, wobei letztere dem axialen Abstand entspricht, der den ersten Flansch (22) und den Shunt (26) trennt, und dass die von der Spule (30) beanspruchte Länge wenigstens höher als die Hälfte der Gesamtlänge des Relais (10) ist.
10. Elektromagnetisches Relais gemäss dem Anspruch 1, 6, 7, 8 oder 9, dadurch gekennzeichnet, dass der Shunt (126) radial von dem Joch (20) durch einen Zwischenraum (e2) getrennt ist, dessen Ausmass grösser ist als die Dicke (12) des Jochs (20).
EP85402117A 1984-11-22 1985-11-05 Polarisiertes elektromagnetisches Relais mit magnetischer Sperrung für einen Auslöser eines Schutzschalters Expired EP0187055B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85402117T ATE44631T1 (de) 1984-11-22 1985-11-05 Polarisiertes elektromagnetisches relais mit magnetischer sperrung fuer einen ausloeser eines schutzschalters.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8418009A FR2573570B1 (fr) 1984-11-22 1984-11-22 Relais electromagnetique polarise a accrochage magnetique pour un declencheur d'un disjoncteur electrique
FR8418009 1985-11-22

Publications (2)

Publication Number Publication Date
EP0187055A1 EP0187055A1 (de) 1986-07-09
EP0187055B1 true EP0187055B1 (de) 1989-07-12

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Country Link
US (1) US4660012A (de)
EP (1) EP0187055B1 (de)
JP (1) JPS61128436A (de)
AT (1) ATE44631T1 (de)
AU (1) AU577996B2 (de)
CA (1) CA1244860A (de)
DE (1) DE3571528D1 (de)
ES (1) ES8700794A1 (de)
FR (1) FR2573570B1 (de)
HK (1) HK113593A (de)
PT (1) PT81448B (de)
SG (1) SG71492G (de)
ZA (1) ZA858730B (de)

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Also Published As

Publication number Publication date
FR2573570A1 (fr) 1986-05-23
JPH0516127B2 (de) 1993-03-03
CA1244860A (en) 1988-11-15
ES8700794A1 (es) 1986-11-16
ATE44631T1 (de) 1989-07-15
ES548563A0 (es) 1986-11-16
JPS61128436A (ja) 1986-06-16
SG71492G (en) 1992-12-04
DE3571528D1 (en) 1989-08-17
HK113593A (en) 1993-10-29
EP0187055A1 (de) 1986-07-09
PT81448B (pt) 1987-09-30
US4660012A (en) 1987-04-21
PT81448A (fr) 1985-12-01
FR2573570B1 (fr) 1988-05-27
AU577996B2 (en) 1988-10-06
ZA858730B (en) 1986-07-30
AU5025185A (en) 1986-05-29

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