EP0432055B1 - Magnetic circuit with shading ring for AC-electrical equipment - Google Patents

Magnetic circuit with shading ring for AC-electrical equipment Download PDF

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Publication number
EP0432055B1
EP0432055B1 EP19900420499 EP90420499A EP0432055B1 EP 0432055 B1 EP0432055 B1 EP 0432055B1 EP 19900420499 EP19900420499 EP 19900420499 EP 90420499 A EP90420499 A EP 90420499A EP 0432055 B1 EP0432055 B1 EP 0432055B1
Authority
EP
European Patent Office
Prior art keywords
magnetic circuit
ring
metal plates
phase shift
slot
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 - Lifetime
Application number
EP19900420499
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German (de)
French (fr)
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EP0432055A1 (en
Inventor
André Vasseur
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
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Filing date
Publication date
Application filed by Merlin Gerin SA filed Critical Merlin Gerin SA
Publication of EP0432055A1 publication Critical patent/EP0432055A1/en
Application granted granted Critical
Publication of EP0432055B1 publication Critical patent/EP0432055B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01F7/10—Electromagnets; Actuators including electromagnets with armatures specially adapted for alternating current
    • H01F7/12—Electromagnets; Actuators including electromagnets with armatures specially adapted for alternating current having anti-chattering arrangements
    • H01F7/1205—Electromagnets; Actuators including electromagnets with armatures specially adapted for alternating current having anti-chattering arrangements having short-circuited conductors

Definitions

  • the invention relates to a magnetic circuit for electrical equipment with alternating current, comprising a stack of elementary sheets in the shape of a U and made of ferromagnetic material, and a phase shift ring partially surrounding a polar surface of the magnetic circuit to create an asymmetry in the distribution of the magnetic flux, said ring being formed by a conducting short-circuiting turn having a square or rectangular section, and extending in parallel with slight recess relative to the pole surface, with passage in a groove formed between two sheets.
  • phase shift ring avoids the vibrations of the magnetic circuit due to the excitation in alternating current of the control coil. It is conventional to insert the phase shift ring in a notch made in the pole surface of the magnetic circuit.
  • the ring surrounds about two thirds of the polar surface to create asymmetry in the distribution of the flux.
  • the notch is generally obtained by a cutting operation, and is at least as wide as the thickness of each sheet. Such technology is suitable for thin sheets of thickness less than 1 mm.
  • Document GB-A-674.702 relates to a magnetic circuit in accordance with the preamble of claim 1.
  • the notch is obtained by a cutting operation of several stacked sheets, and forms a discontinuity in the pole face.
  • phase shift ring For a magnetic circuit with thick sheets, having in particular a thickness close to 2 mm per sheet, the implementation of the phase shift ring is difficult to achieve by a cutting operation which requires a notch width greater than the thickness of prison. There remains of course the possibility of milling a narrower notch, but this method of manufacturing is expensive.
  • the object of the invention is to improve the implementation of a phase shift ring for a magnetic circuit with thick sheets.
  • the magnetic circuit according to the invention is characterized in that the groove is produced by stamping, in the lateral face of at least one branch of each sheet, and in that the ring passes through one of the grooves between two joined sheets.
  • the depth of each groove is less than the thickness of a sheet, and substantially equal to that of the recessed side of the ring.
  • the sheets are produced by a cutting tool after stamping the grooves.
  • the sheet pack is then riveted after stacking of the elementary sheets.
  • the phase shift ring is embedded in the magnetic circuit, without any discontinuity in the corresponding frontal pole surface.
  • phase shift ring Two opposite parallel sides of the phase shift ring protrude from the external edge and the internal edge of two consecutive sheets joined to the magnetic circuit.
  • a U-shaped magnetic circuit 10 comprises a stack of three thick elementary sheets 12,14,16 made of ferromagnetic material, and at least one phase shift ring 18 made of conductive material.
  • the phase shift ring 18 is formed by a short-circuited turn obtained by cutting or cutting a tube of square or rectangular section.
  • the sheets 12, 14, 16 have an identical U-shaped structure, each with an individual thickness close to 2 mm.
  • Each sheet is produced by cutting, and comprises two front surfaces 20, 22 (FIG. 1) arranged at the ends of the two branches 24, 26 of the same length.
  • a rectangular groove 28 is formed in one of the lateral faces of each branch 24, 26, the depth of the groove 28 being less than the thickness of each sheet 12,14,16, and allowing insertion on one side of the phase shift ring 18.
  • the grooves 28 are produced by stamping before the sheet metal cutting operation.
  • the phase shift ring 18 is first inserted into the groove 28 of the first sheet 12 by extending perpendicular to the branch 26.
  • the second sheet 14 is then placed against the first sheet 12 after passage (see arrow F1, FIG. 3) through the window of the ring 18.
  • the third sheet 16 is applied in the direction of arrow F2 against the second sheet 14, so as to trap the ring 18 of phase shift in the package, which can then be riveted for the final assembly of the sheets 12,14,16 of the magnetic circuit 10 ( Figure 5).
  • phase shift ring 18 is slightly set back relative to the pole face 30 formed by the joining of the three plane pole surfaces 22.
  • the other pole face 32 of the magnetic circuit 10 is devoid of phase shift ring.
  • Such an arrangement of the ring 18 facilitates manufacture and avoids any discontinuity in the pole face 30 of the magnetic circuit 10.
  • the magnetic circuit 10 can be used in electrical equipment with alternating current, in particular electromagnets, contactors, remote switches and tripping auxiliaries with emission of current MX or with undervoltage MN.
  • a second phase shift ring can be incorporated in the grooves 28 of the branches 24, set back from the pole face 32.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Soft Magnetic Materials (AREA)
  • Ac-Ac Conversion (AREA)

Description

L'invention est relative à un circuit magnétique pour appareillage électrique à courant alternatif, comprenant un empilage de tôles élémentaires en forme de U et en matériau ferromagnétique, et une bague de déphasage entourant partiellement une surface polaire du circuit magnétique pour créer une dissymétrie dans la répartition du flux magnétique, ladite bague étant formée par une spire conductrice en court-circuit présentant une section carrée ou rectangulaire, et s'étendant parallèlement en léger retrait par rapport à la surface polaire, avec passage dans une rainure ménagée entre deux tôles.The invention relates to a magnetic circuit for electrical equipment with alternating current, comprising a stack of elementary sheets in the shape of a U and made of ferromagnetic material, and a phase shift ring partially surrounding a polar surface of the magnetic circuit to create an asymmetry in the distribution of the magnetic flux, said ring being formed by a conducting short-circuiting turn having a square or rectangular section, and extending in parallel with slight recess relative to the pole surface, with passage in a groove formed between two sheets.

La présence de la bague de déphasage évite les vibrations du circuit magnétique dues à l'excitation en courant alternatif de la bobine de commande. Il est classique d'insérer la bague de déphasage dans une encoche pratiquée dans la surface polaire du circuit magnétique. La bague entoure environ les deux tiers de la surface polaire pour créer la dissymétrie dans la répartition du flux. L'encoche est généralement obtenue par une opération de découpe, et est au moins aussi large que l'épaisseur de chaque tôle. Une telle technologie est appropriée à des tôles minces d'épaisseur inférieure à 1 mm.The presence of the phase shift ring avoids the vibrations of the magnetic circuit due to the excitation in alternating current of the control coil. It is conventional to insert the phase shift ring in a notch made in the pole surface of the magnetic circuit. The ring surrounds about two thirds of the polar surface to create asymmetry in the distribution of the flux. The notch is generally obtained by a cutting operation, and is at least as wide as the thickness of each sheet. Such technology is suitable for thin sheets of thickness less than 1 mm.

Le document GB-A-674.702 se rapporte à un circuit magnétique conforme au préambule de la revendication 1. L'encoche est obtenue par une opération de découpe de plusieurs tôles empilées, et forme une discontinuité dans la face polaire.Document GB-A-674.702 relates to a magnetic circuit in accordance with the preamble of claim 1. The notch is obtained by a cutting operation of several stacked sheets, and forms a discontinuity in the pole face.

Pour un circuit magnétique à tôles épaisses, ayant notammant une épaisseur voisine de 2 mm par tôle, la mise en oeuvre de la bague de déphasage est difficile à réaliser par une opération de découpe qui nécessite une largeur d'encoche supérieure à l'épaisseur de la tôle. Il subsiste bien entendu la possibilité de fraiser une encoche plus étroite, mais ce procédé de fabrication est onéreux.For a magnetic circuit with thick sheets, having in particular a thickness close to 2 mm per sheet, the implementation of the phase shift ring is difficult to achieve by a cutting operation which requires a notch width greater than the thickness of prison. There remains of course the possibility of milling a narrower notch, but this method of manufacturing is expensive.

L'objet de l'invention consiste à améliorer la mise en oeuvre d'une bague de déphasage pour un circuit magnétique à tôles épaisses.The object of the invention is to improve the implementation of a phase shift ring for a magnetic circuit with thick sheets.

Le circuit magnétique selon l'invention est caractérisé en ce que la rainure est réalisée par matriçage, dans la face latérale d'au moins une branche de chaque tôle, et en ce que la bague passe par une des rainures entre deux tôles accolées. La profondeur de chaque rainure est inférieure à l'épaisseur d'une tôle, et sensiblement égale à celle du côté encastré de la bague.The magnetic circuit according to the invention is characterized in that the groove is produced by stamping, in the lateral face of at least one branch of each sheet, and in that the ring passes through one of the grooves between two joined sheets. The depth of each groove is less than the thickness of a sheet, and substantially equal to that of the recessed side of the ring.

Les tôles sont réalisées par un outil de découpe après matriçage des rainures. Le paquet de tôles est ensuite riveté après empilage des tôles élémentaires. La bague de déphasage est encastrée dans le circuit magnétique, sans aucune discontinuité dans la surface polaire frontale correspondante.The sheets are produced by a cutting tool after stamping the grooves. The sheet pack is then riveted after stacking of the elementary sheets. The phase shift ring is embedded in the magnetic circuit, without any discontinuity in the corresponding frontal pole surface.

Deux côtés parallèles opposés de la bague de déphasage font saillie du chant externe et du chant interne de deux tôles consécutives accolées du circuit magnétique.Two opposite parallel sides of the phase shift ring protrude from the external edge and the internal edge of two consecutive sheets joined to the magnetic circuit.

D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre d'un mode de réalisation de l'invention donné à titre d'exemple non limitatif, et représenté aux dessins annexés, dans lesquels :

  • la figure 1 est une vue en perspective d'une tôle rainurée;
  • les figures 2 à 4 montrent les différentes étapes de montage du paquet de tôles;
  • la figure 5 représente une vue en perspective du circuit magnétique assemblé.
Other advantages and characteristics will emerge more clearly from the description which follows of an embodiment of the invention given by way of nonlimiting example, and represented in the appended drawings, in which:
  • Figure 1 is a perspective view of a grooved sheet;
  • Figures 2 to 4 show the different stages of mounting the sheet package;
  • FIG. 5 represents a perspective view of the assembled magnetic circuit.

En référence aux figures 1 à 5, un circuit magnétique 10 en forme de U comporte un empilage de trois tôles 12,14,16 élémentaires épaisses en matériau ferromagnétique, et au moins une bague 18 de déphasage en matériau conducteur.With reference to FIGS. 1 to 5, a U-shaped magnetic circuit 10 comprises a stack of three thick elementary sheets 12,14,16 made of ferromagnetic material, and at least one phase shift ring 18 made of conductive material.

La bague 18 de déphasage est formée par une spire en court-circuit obtenue par tronçonnage ou découpage d'un tube de section carrée ou rectangulaire.The phase shift ring 18 is formed by a short-circuited turn obtained by cutting or cutting a tube of square or rectangular section.

Les tôles 12,14,16 présentent une structure identique en U, avec chacune une épaisseur individuelle voisine de 2 mm. Chaque tôle est réalisée par découpage, et comprend deux surfaces frontales 20,22 (fig. 1) agencées aux extrémités des deux branches 24,26 de mêmes longueurs. Une rainure 28 rectangulaire est ménagée dans l'une des faces latérales de chaque branche 24,26, la profondeur de la rainure 28 étant inférieure à l'épaisseur de chaque tôle 12,14,16, et autorisant l'insertion d'un côté de la bague 18 de déphasage.The sheets 12, 14, 16 have an identical U-shaped structure, each with an individual thickness close to 2 mm. Each sheet is produced by cutting, and comprises two front surfaces 20, 22 (FIG. 1) arranged at the ends of the two branches 24, 26 of the same length. A rectangular groove 28 is formed in one of the lateral faces of each branch 24, 26, the depth of the groove 28 being less than the thickness of each sheet 12,14,16, and allowing insertion on one side of the phase shift ring 18.

Les rainures 28 sont réalisées par matriçage avant l'opération de découpage des tôles.The grooves 28 are produced by stamping before the sheet metal cutting operation.

L'assemblage du circuit magnétique 10 est représenté aux figures 2 à 4 :The assembly of the magnetic circuit 10 is shown in Figures 2 to 4:

Sur la figure 2, la bague 18 de déphasage est d'abord insérée dans la rainue 28 de la première tôle 12 en s'étendant perpendiculairement à la branche 26. La deuxième tôle 14 est ensuite accolée contre la première tôle 12 après passage (voir flèche F1, figure 3) par la fenêtre de la bague 18. Sur la figure 4 la troisième tôle 16 est appliquée dans le sens de la flèche F2 contre la deuxième tôle 14, de manière à emprisonner la bague 18 de déphasage dans le paquet, lequel peut alors être riveté pour l'assemblage définitif des tôles 12,14,16 du circuit magnétique 10 (figure 5).In FIG. 2, the phase shift ring 18 is first inserted into the groove 28 of the first sheet 12 by extending perpendicular to the branch 26. The second sheet 14 is then placed against the first sheet 12 after passage (see arrow F1, FIG. 3) through the window of the ring 18. In FIG. 4, the third sheet 16 is applied in the direction of arrow F2 against the second sheet 14, so as to trap the ring 18 of phase shift in the package, which can then be riveted for the final assembly of the sheets 12,14,16 of the magnetic circuit 10 (Figure 5).

On remarque sur la figure 5 que deux côtés parallèles opposés de la bague 18 font saillie du chant externe et du chant interne de la branche 26 des première et deuxième tôles 12,14, alors que les deux autres côtés opposés de la bague 18 sont insérés totalement dans la rainure 28 correspondante des première et troisième tôles 12,16.Note in Figure 5 that two opposite parallel sides of the ring 18 protrude from the outer edge and the inner edge of the branch 26 of the first and second sheets 12,14, while the other two opposite sides of the ring 18 are inserted totally in the corresponding groove 28 of the first and third sheets 12.16.

La bague 18 de déphasage se trouve légèrement en retrait par rapport à la face polaire 30 constituée par l'accolement des trois surfaces polaires 22 planes. L'autre face polaire 32 du circuit magnatique 10 est dépourvue de bague de déphasage.The phase shift ring 18 is slightly set back relative to the pole face 30 formed by the joining of the three plane pole surfaces 22. The other pole face 32 of the magnetic circuit 10 is devoid of phase shift ring.

Un tel agencement de la bague 18 facilite la fabrication et évite toute discontinuité dans la face polaire 30 du circuit magnétique 10.Such an arrangement of the ring 18 facilitates manufacture and avoids any discontinuity in the pole face 30 of the magnetic circuit 10.

Le circuit magnétique 10 peut être utilisé dans l'appareillage électrique à courant alternatif, notamment les électro-aimants, contacteurs, télérupteurs et auxiliaires de déclenchement à émission de courant MX ou à manque de tension MN.The magnetic circuit 10 can be used in electrical equipment with alternating current, in particular electromagnets, contactors, remote switches and tripping auxiliaries with emission of current MX or with undervoltage MN.

En fonction du type de palette mobile, une deuxième bague de déphasage peut être incorporée dans les rainures 28 des branches 24, en retrait de la face polaire 32.Depending on the type of movable pallet, a second phase shift ring can be incorporated in the grooves 28 of the branches 24, set back from the pole face 32.

Claims (4)

  1. Magnetic circuit for alternating current electrical apparatus, comprising a stack of elementary U-shaped metal plates (12, 14, 16) of ferromagnetic material and a phase shift ring (18) surrounding partially a pole surface (30) of the magnetic circuit (10) in order to produce an asymmetry in the magnetic flux distribution, said ring being constituted of a short-circuit conductive turn having a square or rectangular section and extending parallelly, with a slight recess with respect to the pole surface (30) and passing through a slot (28) provided between two metal plates (14, 16), characterized in that the slot is realized by stamping, in the lateral face of at least one branch (24, 26) of each metal plate (12, 14, 16) and that the ring (18) passes through one of the slots (28) between two coupled metal plates.
  2. Magnetic circuit according to claim 1, characterized in that the depth of each slot (28) is smaller than the thickness of a metal plate and nearly the same as that of the embedded side of the ring (18).
  3. Magnetic circuit according to claim 2, characterized in that the two parallel opposite sides of the phase shift ring (18) protrude from the outer and the inner edge of two consecutive joined metal plates (12, 14) of the magnetic circuit (10).
  4. Magnetic circuit according to one of the claims 1 to 3, characterized in that the magnetic circuit (10) comprises three identical metal plates (12, 14, 16), the thickness of each metal plate being close to 2 mm.
EP19900420499 1989-12-05 1990-11-20 Magnetic circuit with shading ring for AC-electrical equipment Expired - Lifetime EP0432055B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8916167A FR2655472B1 (en) 1989-12-05 1989-12-05 MAGNETIC CIRCUIT WITH PHASE RING FOR AC ELECTRICAL EQUIPMENT.
FR8916167 1989-12-05

Publications (2)

Publication Number Publication Date
EP0432055A1 EP0432055A1 (en) 1991-06-12
EP0432055B1 true EP0432055B1 (en) 1994-03-16

Family

ID=9388242

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900420499 Expired - Lifetime EP0432055B1 (en) 1989-12-05 1990-11-20 Magnetic circuit with shading ring for AC-electrical equipment

Country Status (3)

Country Link
EP (1) EP0432055B1 (en)
DE (1) DE69007437D1 (en)
FR (1) FR2655472B1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR857941A (en) * 1938-07-18 1940-10-05 Philips Nv Relay energized by alternating current
CH232768A (en) * 1943-03-26 1944-06-15 Bbc Brown Boveri & Cie Single-phase alternating current magnet with short-circuit winding.
GB674702A (en) * 1949-07-26 1952-06-25 British Thomson Houston Co Ltd Improvements in and relating to alternating current electromagnets
DE1268742B (en) * 1961-09-06 1968-05-22 Siemens Ag Arrangement and fastening of short-circuit rings
GB2206453B (en) * 1987-06-22 1992-01-02 Linton & Hirst Ltd Pack of laminations and forming projections and depressions

Also Published As

Publication number Publication date
DE69007437D1 (en) 1994-04-21
FR2655472B1 (en) 1994-03-04
FR2655472A1 (en) 1991-06-07
EP0432055A1 (en) 1991-06-12

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