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WO2002071420A1 - Electromagnetic actuator - Google Patents

Electromagnetic actuator Download PDF

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Publication number
WO2002071420A1
WO2002071420A1 PCT/FR2002/000724 FR0200724W WO02071420A1 WO 2002071420 A1 WO2002071420 A1 WO 2002071420A1 FR 0200724 W FR0200724 W FR 0200724W WO 02071420 A1 WO02071420 A1 WO 02071420A1
Authority
WO
WIPO (PCT)
Prior art keywords
core
housing
coil
electromagnetic actuator
axial direction
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.)
Ceased
Application number
PCT/FR2002/000724
Other languages
French (fr)
Inventor
Lucien Donce
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.)
Johnson Controls Automotive Electronics SAS
Original Assignee
Johnson Controls Automotive Electronics 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 Johnson Controls Automotive Electronics SAS filed Critical Johnson Controls Automotive Electronics SAS
Priority to AT02706905T priority Critical patent/ATE435496T1/en
Priority to EP02706905A priority patent/EP1364377B1/en
Priority to DE60232780T priority patent/DE60232780D1/en
Publication of WO2002071420A1 publication Critical patent/WO2002071420A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/02—Cores, Yokes, or armatures made from sheets
    • 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
    • H01F7/081—Magnetic constructions

Definitions

  • the invention relates to an electromagnetic actuator.
  • Electromagnetic actuators comprising coils carried by a housing and actuating members each comprising a rod mounted movable in an axial direction of each coil, each coil being associated with a core formed by a stack of sheets of ferromagnetic material s extending parallel to the axial direction of the coil, the core having an active face extending perpendicular to the axis of the coil and external faces turned towards adjacent walls of the housing.
  • the rod of the actuating member is generally associated with a pallet extending opposite the active face of the core.
  • a magnetic flux is established in the core by the coil so that the pallet is attracted towards the active face of the core.
  • the core sheets are attracted to the pallet, and therefore tend to move in the axial direction of the coil.
  • This arrangement requires additional parts and additional cuts in the sheets. Furthermore, this arrangement requires additional assembly operations.
  • the lateral external faces of the core comprise at least one retaining portion projecting from the lateral external face of the core in a direction forming with the axial direction of the coil an angle less than 90 degrees.
  • the retaining portion extends adjacent to an edge of the core, over at least a quarter of the lateral face measured in the axial direction of the coil.
  • the retaining force is distributed over an appreciable portion of the lateral face.
  • the housing is molded on the core and extends in contact with the retaining portions of the lateral external faces of the core.
  • the housing itself forms the retaining member.
  • the housing is made of a thermally conductive material. This takes advantage of the large contact surface of the housing with the core to efficiently evacuate to the outside the heat generated in the core during the operation of the actuator.
  • FIG. 2 is a sectional view along the plane II -II of Figure 1;
  • FIG. 3 is a partial perspective view of the actuator.
  • the electromagnetic actuator described here is suitable for controlling the opening and closing of two valves not shown with parallel axes X.
  • the electromagnetic actuator is substantially symmetrical along a plane P defining a separation between the elements of the actuator intended for the control of each valve.
  • the electromagnetic actuator includes a housing
  • the cores 4,5 are formed by a stack of sheets of ferromagnetic material extending parallel to the axis X and have active faces 6 which extend opposite one another perpendicular to the axes X.
  • the lower part 3 of the housing has a support contour 27 projecting from the active face 6 of the core 5 and parallel thereto.
  • the contour 27 cooperates with a bearing face 28 of the upper part 2 of the housing to maintain a spacing between the active faces 6 of the cores 4,5.
  • Housing parts have bores
  • the cores 4, 5 have external faces co-taking a rear external face 19 formed by the juxtaposition of the rear edges of the sheets opposite the active face 6 and the lateral external faces 20 formed by the juxtaposition of the lateral edges of the sheets .
  • Coils 8 are force fitted around intermediate parts 7 of the cores 4,5.
  • the coils 8 are arranged opposite two by two to form two pairs of adjacent coils having parallel X axes.
  • Each coil is framed on the one hand by a lateral part 10 of the corresponding core and on the other hand by a central part 11.
  • the central part 11 is common to two adjacent coils.
  • each pair of coils is associated with an actuating member 30 which can move along the associated axis X.
  • Each actuator 30 comprises a pallet 15 extending between the active faces 6 of the 4,5 nuclei parallel to these.
  • the pallet 15 is associated with an actuating rod 16 mounted to slide in a guide 22 passing through an intermediate part 7 of the core 5.
  • the central plates of the core 5 are cut to form a passage 24 passing through the base of the core and a housing 26 at the level of each intermediate part 7.
  • a cylindrical guide 22 having an external diameter less than the smallest transverse dimension of the passage 24 extends coaxially with the axis X through the passage 24.
  • the guide 22 comprises a first part extending in the lower part 3 of the housing and maintained by the latter as will be indicated below, and a second part extending in the passage 24. The second part of the guide 22 extends to the active face 6 to ensure proper guidance of the rod 16.
  • the second part of the guide 22 is included in a rectangular insert 23.
  • the insert 23 has dimensions suitable for the sheet metal plates delimiting the housing 26 are in intimate contact with the insert when 'of the stack of sheets, and extends to an inner face 25 of the core on which there opens the passage 24.
  • the passage 24 has a section lower than the section of the insert 23, so that the insert 23 covers the day between the guide 22 and the passage 24.
  • the lateral external faces 20 of the cores 4.5 comprise retaining portions 21 which extend projecting from the lateral external faces 20 adjacent to the edge formed by the lateral external faces 20 and the associated rear external face 19.
  • the retaining portions 21 extend in a direction which forms with the direction axial position of the coil at an angle B, here about 5 degrees.
  • the height of the retaining portions 21 is preferably greater than a quarter of the height of the lateral faces 20.
  • each core is assembled by first stacking the sheets previously cut according to the shape corresponding to their position in the stack.
  • the guide 22 is force fitted into the insert 23, then the insert is positioned in the stack before clamping it between jaws which bear on the external sheets by masking the openings between the central part 11 and the intermediate parts 7 as well as between the intermediate parts 7 and the side parts 10.
  • a mold is placed around the stack of sheets and the jaws which hold them and a non-magnetic material, preferably a thermally conductive material such as aluminum is injected to form the corresponding part of the housing as illustrated in FIG. 2.
  • the good thermal conductivity of the material of the housing 1 and the large contact surface of the latter with the cores 4,5 make it possible to efficiently dissipate the heat generated in the cores 4,5 during operation of the actuator.
  • the molded material forming the side wall 31 of the housing conforms to the external contour of the retaining portions 21 and ensures a locking by wedge effect of the sheets against an axial movement.
  • the retaining portions thus produced make it possible to distribute the retaining force along these retaining portions while avoiding any concentration of stress in the core or in the housing.
  • the insert 23 serves to hold the position in position of the guide 22, and prevents the molten material from flowing beyond the passage 24.
  • the lower part 3 of the housing then extends into the space delimited by the external surface of the guide 22 and the passage 24 to maintain 5 lies the guide 22.
  • the insert 23 is made of ferromagnetic material with high resistivity such as ferrite. The insert then partially compensates for the loss of magnetic efficiency of the core 5 resulting from the housing 26 in the intermediate parts 7.
  • 15 tier are molded on the cores, one can use housing parts snap-on the core, or housing parts having an insert retaining member of the core. In particular, a shim can be engaged between the retaining portion of the core and the associated housing part.
  • these retaining portions may more generally be located at any level of the lateral face, without necessarily being adjacent to this corner.
  • retaining portions have been illustrated with a straight edge, they can also be made with a curved edge.
  • an electromagnetic actuator having two actuating members and four coils, the invention is applicable to any type of electromagnetic actuator comprising at least one coil provided with a sheet metal core and associated with at least one actuator.
  • the invention applies more generally to actuating members moving in an axial direction of the coils, without however that a rod of the actuating member passes through the coil.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Magnetically Actuated Valves (AREA)
  • Fluid-Damping Devices (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The invention concerns an electromagnetic actuator comprising at least a coil (8) borne by a housing (1) and at least an actuating member (30) comprising a rod (15) mounted mobile along an axial direction (X) of the coil (8), the coil (8) being associated with a core (4, 5) consisting of a stack of plates extending parallel to the axial direction of the coil (8), the core (4, 5) having lateral outer surfaces (20) facing adjacent walls of the housing (1) and comprising at least a retaining portion (21) extending in projection from the lateral end surfaces (20) along a direction forming with the axial direction of the coil an angle (B) less than 90 degrees, a non-magnetic retaining member (31) integral with the housing (1) being arranged relative to the retaining portion (21) to counter a movement of the plates of the core (4, 5) relative to the housing (1).

Description

Actionneur électromagnétique Electromagnetic actuator

L'invention concerne un actionneur électromagnéti- que.The invention relates to an electromagnetic actuator.

On connaît des actionneurs électromagnétiques comprenant des bobines portées par un boîtier et des organes d' actionnement comportant chacun une tige montée mobile selon une direction axiale de chaque bobine, chaque bobine étant associée à un noyau formé d'un empilage de tôles en matériau ferromagnétique s'étendant parallèlement à la direction axiale de la bobine, le noyau ayant une face active s'étendant perpendiculairement à l'axe de la bobine et des faces externes tournées vers des parois adjacentes du boî- tier.Electromagnetic actuators are known comprising coils carried by a housing and actuating members each comprising a rod mounted movable in an axial direction of each coil, each coil being associated with a core formed by a stack of sheets of ferromagnetic material s extending parallel to the axial direction of the coil, the core having an active face extending perpendicular to the axis of the coil and external faces turned towards adjacent walls of the housing.

La tige de l'organe d' actionnement est en général associée à une palette s'étendant en regard de la face active du noyau. Lors du fonctionnement de 1 ' actionneur, un flux magnétique est établi dans le noyau par la bobine de sorte que la palette se trouve attirée vers la face active du noyau. En réaction, les tôles du noyau sont attirées vers la palette, et ont donc tendance à se déplacer selon la direction axiale de la bobine.The rod of the actuating member is generally associated with a pallet extending opposite the active face of the core. During operation of the actuator, a magnetic flux is established in the core by the coil so that the pallet is attracted towards the active face of the core. In reaction, the core sheets are attracted to the pallet, and therefore tend to move in the axial direction of the coil.

Afin d'éviter ces déplacements, il est connu de so- lidariser les tôles entre elles au moyen d'agrafes, ou au moyen de cordons de soudure s'étendant sur une face externe du noyau transversalement aux tôles. Le noyau est alors retenu en position dans le boîtier au moyen de butées coopérant avec la face active du noyau. Afin que les butées ne s'étendent pas entre la face active du noyau et la palette, des tôles supplémentaires sont prévues pour étendre l'empilement au delà du champ de la palette. Les butées coopèrent donc uniquement avec les tôles supplémentaires, les autres tôles étant retenues axialement du fait de leur solidarisation aux tôles supplémentaires. Cette solidarisation reste néanmoins insuffisante au regard des efforts mis en jeu dans ce type d'application. Par ailleurs, les agrafes ou les cordons de soudure ont pour inconvénient de réaliser entre les tôles des courts-circuits favorisant l'apparition de courants de Foucault indésirables.In order to avoid these displacements, it is known to solidify the sheets together by means of staples, or by means of weld beads extending on an external face of the core transversely to the sheets. The core is then retained in position in the housing by means of stops cooperating with the active face of the core. So that the stops do not extend between the active face of the core and the pallet, additional sheets are provided to extend the stack beyond the field of the pallet. The stops therefore cooperate only with the additional sheets, the other sheets being retained axially due to their attachment to the additional sheets. However, this joining remains insufficient in view of the efforts involved in this type of application. Furthermore, the staples or the weld seams have the disadvantage of producing short circuits between the sheets promoting the appearance of undesirable eddy currents.

On a également envisagé de solidariser les tôles entre elles en les montant dans le boîtier pour être pressées les unes contre les autres, le frottement entre les tôles s 'opposant à un mouvement axial des tôles. Mais étant donné le faible coefficient de frottement entre les tôles, la pression nécessaire pour empêcher un déplacement des tôles devrait être importante, ce qui entraînerait des difficultés d'assemblage. On connaît par ailleurs du document WO 00/33329 un actionneur dans lequel les tôles sont maintenues dans le boîtier au moyen de tiges de blocage qui traversent toutes les tôles et qui sont engagées dans des alésages du noyau.It has also been envisaged to join the sheets together by mounting them in the housing to be pressed against each other, the friction between the sheets opposing an axial movement of the sheets. However, given the low coefficient of friction between the sheets, the pressure necessary to prevent the sheets from moving should be high, which would cause assembly difficulties. Document WO 00/33329 also discloses an actuator in which the sheets are held in the housing by means of locking rods which pass through all the sheets and which are engaged in core bores.

Cette disposition nécessite des pièces supplémen- taires et des découpages additionnels dans les tôles. Par ailleurs, cette disposition nécessite des opérations d'assemblage additionnelles.This arrangement requires additional parts and additional cuts in the sheets. Furthermore, this arrangement requires additional assembly operations.

On connaît également de ce document ou du document américain US 5 155 461 la réalisation de portions de rete- nue du noyau qui sont découpées en queue d'aronde sur les faces externes du noyau en regard du boîtier. Ces portions de retenue présentent l'inconvénient de constituer des zones de concentration de contrainte dans le noyau et dans l'organe de retenue, ce qui est préj diciable à la durée de ' . vie du boîtier.Also known from this document or from American document US Pat. No. 5,155,461 is the production of retaining portions of the core which are cut in dovetail on the external faces of the core facing the housing. These retaining portions have the drawback of constituting zones of stress concentration in the core and in the retaining member, which is detrimental to the duration of ' . case life.

Selon l'invention, les faces externes latérales du noyau comportent au moins une portion de retenue s'étendant en saillie de la face externe latérale du noyau selon une direction formant avec la direction axiale de la bobine un angle inférieur à 90 degrés. Ainsi, le noyau est bloqué dans le boîtier par effet de coin avec l'organe de retenue, sans création de zone de concentration de contrainte.According to the invention, the lateral external faces of the core comprise at least one retaining portion projecting from the lateral external face of the core in a direction forming with the axial direction of the coil an angle less than 90 degrees. Thus, the core is locked in the housing by wedge effect with the retaining member, without creating a stress concentration zone.

Selon un mode préféré de réalisation, la portion de retenue s'étend de façon adjacente à une arête du noyau, sur au moins un quart de la face latérale mesurée selon la direction axiale de la bobine.According to a preferred embodiment, the retaining portion extends adjacent to an edge of the core, over at least a quarter of the lateral face measured in the axial direction of the coil.

Ainsi, l'effort de retenue est réparti sur une portion appréciable de la face latérale. Selon un mode préféré de réalisation, le boîtier est moulé sur le noyau et s'étend en contact avec les portions de retenue des faces externes latérales du noyau.Thus, the retaining force is distributed over an appreciable portion of the lateral face. According to a preferred embodiment, the housing is molded on the core and extends in contact with the retaining portions of the lateral external faces of the core.

Ainsi, le boîtier forme lui-même l'organe de retenue. De préférence, le boîtier est réalisé dans un matériau thermiquement conducteur. On profite ainsi de la grande surface de contact du boîtier avec le noyau pour évacuer efficacement vers l'extérieur la chaleur générée dans le noyau lors du fonctionnement de l' actionneur . D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lumière de la description qui suit d'un mode de réalisation particulier non limitatif de l'invention, en référence aux figures ci- jointes parmi lesquelles : - la figure 1 est une vue en perspective partielle à échelle réduite de l'actionneur selon l'invention ;Thus, the housing itself forms the retaining member. Preferably, the housing is made of a thermally conductive material. This takes advantage of the large contact surface of the housing with the core to efficiently evacuate to the outside the heat generated in the core during the operation of the actuator. Other characteristics and advantages of the invention will appear more clearly in the light of the following description of a particular non-limiting embodiment of the invention, with reference to the attached figures among which: - Figure 1 is a partial perspective view on a reduced scale of the actuator according to the invention;

- la figure 2 est une vue en coupe selon le plan II -II de la figure 1 ;- Figure 2 is a sectional view along the plane II -II of Figure 1;

- la figure 3 est une vue en perspective partielle de l'actionneur.- Figure 3 is a partial perspective view of the actuator.

En référence aux figures, l'actionneur électromagnétique décrit ici est adapté à commander l'ouverture et la fermeture de deux soupapes non représentées d'axes parallèles X. L'actionneur électromagnétique est sensiblement symétrique selon un plan P définissant une séparation entre les éléments de l'actionneur destinés à la commande de chaque soupape .With reference to the figures, the electromagnetic actuator described here is suitable for controlling the opening and closing of two valves not shown with parallel axes X. The electromagnetic actuator is substantially symmetrical along a plane P defining a separation between the elements of the actuator intended for the control of each valve.

L'actionneur électromagnétique comprend un boîtierThe electromagnetic actuator includes a housing

1 composé d'une partie supérieure 2 et d'une partie infé- rieure 3 et contenant des noyaux respectivement référencés1 composed of an upper part 2 and a lower part 3 and containing cores respectively referenced

4 et 5.4 and 5.

Les noyaux 4,5 sont formés d'un empilement de tôles en matériau ferromagnétique s'étendant parallèlement à l'axe X et comportent des faces actives 6 qui s'étendent en regard l'une de l'autre perpendiculairement aux axes X.The cores 4,5 are formed by a stack of sheets of ferromagnetic material extending parallel to the axis X and have active faces 6 which extend opposite one another perpendicular to the axes X.

La partie inférieure 3 du boîtier comporte un contour d'appui 27 en saillie de la face active 6 du noyau 5 et parallèle à celle-ci. Le contour 27 coopère avec une face d'appui 28 de la partie supérieure 2 du boîtier pour maintenir un écartement entre les faces actives 6 des noyaux 4,5. Les parties de boîtier comportent des alésagesThe lower part 3 of the housing has a support contour 27 projecting from the active face 6 of the core 5 and parallel thereto. The contour 27 cooperates with a bearing face 28 of the upper part 2 of the housing to maintain a spacing between the active faces 6 of the cores 4,5. Housing parts have bores

29 pour le passage de goujons non représentés servant à l'assemblage des deux parties de boîtier.29 for the passage of studs not shown used for the assembly of the two housing parts.

Les noyaux 4 , 5 comportent des faces externes co - prenant une face externe arrière 19 formée par la juxtaposition des bords arrières des tôles à l'opposé de la face active 6 et des faces externes latérales 20 formées par la juxtaposition des bords latéraux des tôles.The cores 4, 5 have external faces co-taking a rear external face 19 formed by the juxtaposition of the rear edges of the sheets opposite the active face 6 and the lateral external faces 20 formed by the juxtaposition of the lateral edges of the sheets .

Des bobines 8 sont montées à force autour de par- ties intercalaires 7 des noyaux 4,5. Les bobines 8 sont disposées en regard deux à deux pour former deux paires de bobines adjacentes ayant des axes X parallèles. Chaque bobine est encadrée d'une part par une partie latérale 10 du noyau correspondant et d'autre part par une partie centrale 11. La partie centrale 11 est commune à deux bobines adjacentes .Coils 8 are force fitted around intermediate parts 7 of the cores 4,5. The coils 8 are arranged opposite two by two to form two pairs of adjacent coils having parallel X axes. Each coil is framed on the one hand by a lateral part 10 of the corresponding core and on the other hand by a central part 11. The central part 11 is common to two adjacent coils.

Par ailleurs, chaque paire de bobines est associée à un organe d' actionnement 30 pouvant se déplacer selon l'axe X associé. Chaque organe d' actionnement 30 comprend une palette 15 s'étendant entre les faces actives 6 des noyaux 4,5 parallèlement à ces dernières. La palette 15 est associée à une tige d' actionnement 16 montée pour coulisser dans un guide 22 traversant une partie intercalaire 7 du noyau 5. Ainsi que cela est illustré à la figure 3 sur laquelle seule une partie du noyau 5 a été représentée, les tôles centrales du noyau 5 sont découpées pour former un passage 24 traversant la base du noyau et un logement 26 au niveau de chaque partie intercalaire 7. Un guide 22 cylindrique ayant un diamètre externe inférieur à la plus petite dimension transversale du passage 24 s'étend coaxialement à l'axe X à travers le passage 24. Le guide 22 comprend une première partie s'étendant dans la partie inférieure 3 du boîtier et maintenue par celle-ci ainsi qu'il sera indiqué plus loin, et une seconde partie s'étendant dans le passage 24. La seconde partie du guide 22 s'étend jusqu'à la face active 6 pour assurer un guidage convenable de la tige 16.Furthermore, each pair of coils is associated with an actuating member 30 which can move along the associated axis X. Each actuator 30 comprises a pallet 15 extending between the active faces 6 of the 4,5 nuclei parallel to these. The pallet 15 is associated with an actuating rod 16 mounted to slide in a guide 22 passing through an intermediate part 7 of the core 5. As illustrated in FIG. 3 in which only a part of the core 5 has been shown, the central plates of the core 5 are cut to form a passage 24 passing through the base of the core and a housing 26 at the level of each intermediate part 7. A cylindrical guide 22 having an external diameter less than the smallest transverse dimension of the passage 24 extends coaxially with the axis X through the passage 24. The guide 22 comprises a first part extending in the lower part 3 of the housing and maintained by the latter as will be indicated below, and a second part extending in the passage 24. The second part of the guide 22 extends to the active face 6 to ensure proper guidance of the rod 16.

Ainsi que cela est visible à la figure 1 sur laquelle les bobines 8 et les organes d' actionnement 30 ont été enlevés, la seconde partie du guide 22 est incluse dans un insert parallélépipédique 23. L' insert 23 a des dimensions appropriées pour que les plaques de tôles délimitant le logement 26 soient en contact intime avec l' insert lors ' de l'empilage des tôles, et s'étend jusqu'à une face interne 25 du noyau sur laquelle débouche le passage 24. Le passage 24 a une section inférieure à la section de l' insert 23, de sorte que l' insert 23 recouvre le jour entre le guide 22 et le passage 24. ' Les faces externes latérales 20 des noyaux 4,5 comportent des portions de retenue 21 qui s'étendent en saillie des faces externes latérales 20 de façon adjacente à l'arête formée par les faces externes latérales 20 et la face externe arrière 19 associée. Les portions de retenue 21 s'étendent selon une direction qui forme avec la direc- tion axiale de la bobine un angle B, ici d'environ 5 degrés. La hauteur des portions de retenue 21 est de préférence supérieure au quart de la hauteur des faces latérales 20. Ces portions de retenue sont obtenues par un découpage approprié des tôles formant le noyau.As can be seen in FIG. 1 on which the coils 8 and the actuating members 30 have been removed, the second part of the guide 22 is included in a rectangular insert 23. The insert 23 has dimensions suitable for the sheet metal plates delimiting the housing 26 are in intimate contact with the insert when 'of the stack of sheets, and extends to an inner face 25 of the core on which there opens the passage 24. the passage 24 has a section lower than the section of the insert 23, so that the insert 23 covers the day between the guide 22 and the passage 24. ' The lateral external faces 20 of the cores 4.5 comprise retaining portions 21 which extend projecting from the lateral external faces 20 adjacent to the edge formed by the lateral external faces 20 and the associated rear external face 19. The retaining portions 21 extend in a direction which forms with the direction axial position of the coil at an angle B, here about 5 degrees. The height of the retaining portions 21 is preferably greater than a quarter of the height of the lateral faces 20. These retaining portions are obtained by appropriate cutting of the sheets forming the core.

Dans le mode de réalisation illustré, chaque noyau est assemblé en procédant tout d'abord à un empilage des tôles préalablement découpées selon la forme correspondant à leur position dans l'empilage. En ce qui concerne le noyau 5, le guide 22 est emmanché à force dans l' insert 23, puis l' insert est positionné dans l'empilage avant de serrer celui-ci entre des mâchoires qui prennent appui sur les tôles externes en masquant les ouvertures entre la partie centrale 11 et les parties intercalaires 7 ainsi qu'entre les parties intercalaires 7 et les parties latérales 10. Un moule est disposé autour de l'empilage de tôles et des mâchoires qui les maintiennent et une matière non magnétique, de préférence une matière thermiquement conductrice telle que de l'aluminium est injectée pour former la partie cor- respondante du boîtier comme illustré à la figure 2. La bonne conductibilité thermique du matériau constitutif du boîtier 1 et la grande surface de contact de ce dernier avec les noyaux 4,5 permettent d'assurer une évacuation efficace de la chaleur générée dans les noyaux 4,5 lors du fonctionnement de l'actionneur.In the illustrated embodiment, each core is assembled by first stacking the sheets previously cut according to the shape corresponding to their position in the stack. With regard to the core 5, the guide 22 is force fitted into the insert 23, then the insert is positioned in the stack before clamping it between jaws which bear on the external sheets by masking the openings between the central part 11 and the intermediate parts 7 as well as between the intermediate parts 7 and the side parts 10. A mold is placed around the stack of sheets and the jaws which hold them and a non-magnetic material, preferably a thermally conductive material such as aluminum is injected to form the corresponding part of the housing as illustrated in FIG. 2. The good thermal conductivity of the material of the housing 1 and the large contact surface of the latter with the cores 4,5 make it possible to efficiently dissipate the heat generated in the cores 4,5 during operation of the actuator.

La matière moulée formant la paroi latérale 31 du boîtier épouse le contour externe des portions de retenue 21 et assure un verrouillage par effet de coin des tôles à l' encontre d'un mouvement axial. Les portions de retenue ainsi réalisées permettent de répartir l'effort de retenue le long de ces portions de retenue en évitant toute concentration de contrainte dans le noyau ou dans le boîtier.The molded material forming the side wall 31 of the housing conforms to the external contour of the retaining portions 21 and ensures a locking by wedge effect of the sheets against an axial movement. The retaining portions thus produced make it possible to distribute the retaining force along these retaining portions while avoiding any concentration of stress in the core or in the housing.

En outre, lors du moulage de la partie de boîtier 3 sur le noyau 5, l' insert 23 sert de maintien en position du guide 22, et empêche le matériau en fusion de s'écouler au delà du passage 24. La partie inférieure 3 du boîtier s'étend alors jusque dans l'espace délimité par la surface externe du guide 22 et le passage 24 pour maintenir ferme- 5 ment le guide 22. De préférence, l' insert 23 est réalisé en matériau ferromagnétique à forte résistivité telle que de la ferrite. L' insert compense alors en partie la perte d'efficacité magnétique du noyau 5 résultant du logement 26 dans les parties intercalaires 7.In addition, during the molding of the housing part 3 on the core 5, the insert 23 serves to hold the position in position of the guide 22, and prevents the molten material from flowing beyond the passage 24. The lower part 3 of the housing then extends into the space delimited by the external surface of the guide 22 and the passage 24 to maintain 5 lies the guide 22. Preferably, the insert 23 is made of ferromagnetic material with high resistivity such as ferrite. The insert then partially compensates for the loss of magnetic efficiency of the core 5 resulting from the housing 26 in the intermediate parts 7.

10 L'invention n'est pas limitée au mode particulier de réalisation qui vient d'être décrit, mais entend bien au contraire couvrir toute variante qui entre dans le cadre de l'invention tel que défini par les revendications.The invention is not limited to the particular embodiment which has just been described, but intends on the contrary to cover any variant which falls within the scope of the invention as defined by the claims.

Bien que l'on ait indiqué que les parties de boî-Although it has been stated that the parts of the box

15 tier sont moulées sur les noyaux, on peut recourir à des parties de boîtier encliquetables sur le noyau, ou à des parties de boîtier possédant un organe de retenue du noyau rapporté. On pourra notamment engager une cale entre la portion de retenue du noyau et la partie de boîtier asso-15 tier are molded on the cores, one can use housing parts snap-on the core, or housing parts having an insert retaining member of the core. In particular, a shim can be engaged between the retaining portion of the core and the associated housing part.

20. ciée, ou encore réaliser un berceau enserrant le noyau et rapporté dans le boîtier.20. ciée, or even make a cradle enclosing the core and attached to the housing.

Bien que l'invention ait été illustrée avec des portions de retenue 21 s'étendant de façon adjacente à l'arête formée par les faces externes latérales et la faceAlthough the invention has been illustrated with retaining portions 21 extending adjacent to the edge formed by the lateral external faces and the face

25. externe arrière du noyau, ces portions de retenue pourront plus généralement être situées à un niveau quelconque de la face latérale, sans être forcément adjacente à ce coin.25. external rear of the core, these retaining portions may more generally be located at any level of the lateral face, without necessarily being adjacent to this corner.

Bien que les portions de retenue aient été illustrées comme formant un angle B très faible avec la direc-Although the retaining portions have been shown to form a very small angle B with the direction

30 tion axiale de la bobine, ce qui permet d'obtenir un effet de coin tout en minimisant l'augmentation d'encombrement du noyau, on pourra augmenter cet angle pour obtenir un effet de coin plus prononcé. L'angle B devra cependant rester inférieur à 90 degrés afin de ne pas créer le long de la face30 axial reel, which allows to obtain a wedge effect while minimizing the increase in size of the core, we can increase this angle to obtain a more pronounced wedge effect. The angle B must however remain less than 90 degrees so as not to create along the face

35 latérale du noyau des points de rebroussement qui seraient générateurs de contraintes. On peut également multiplier les portions de retenue pour obtenir un effet de coin plus important sans augmenter l'encombrement du. noyau.35 lateral of the core of the cusps which would be constraint generators. You can also multiply the retaining portions to obtain a greater wedge effect without increasing the size of the. core.

Bien que les portions de retenue aient été illus- trées avec un bord rectiligne on peut également les réaliser avec un bord curviligne.Although the retaining portions have been illustrated with a straight edge, they can also be made with a curved edge.

Bien que l'on ait décrit un actionneur électromagnétique possédant deux organes d' actionnement et quatre bobines, l'invention est applicable à tout type d' ctionneur électromagnétique comprenant au moins une bobine pourvue d'un noyau en tôles et associée à au moins un organe d' actionnement .Although an electromagnetic actuator has been described having two actuating members and four coils, the invention is applicable to any type of electromagnetic actuator comprising at least one coil provided with a sheet metal core and associated with at least one actuator.

Bien que l'on ait indiqué que les axes de déplacement des organes d' actionnement coïncident avec les axes des bobines, l'invention s'applique plus généralement à des organes d' actionnement se déplaçant selon une direction axiale des bobines, sans pour autant qu'une tige de l'organe d' actionnement traverse la bobine. Although it has been indicated that the axes of movement of the actuating members coincide with the axes of the coils, the invention applies more generally to actuating members moving in an axial direction of the coils, without however that a rod of the actuating member passes through the coil.

Claims

REVENDICATIONS 1. Actionneur électromagnétique comprenant au moins une bobine (8) portée par un boîtier (1) et au moins un or- 5 gane d' actionnement (30) comportant une tige (15) montée mobile selon une direction axiale (X) de la bobine (8) , la bobine (8) étant associée à un noyau (4,5) formé d'un empilage de tôles en matériau ferromagnétique s'étendant parallèlement à la direction axiale de la bobine (8) , le noyau1. Electromagnetic actuator comprising at least one coil (8) carried by a housing (1) and at least one actuating member (30) comprising a rod (15) mounted movably in an axial direction (X) of the coil (8), the coil (8) being associated with a core (4,5) formed by a stack of sheets of ferromagnetic material extending parallel to the axial direction of the coil (8), the core 10 (4,5) ayant une face active (6) s'étendant perpendiculairement à la direction axiale de la bobine et des faces externes latérales (20) tournées vers des parois adjacentes du boîtier (1) les faces externes latérales (20) du noyau (4,5) comportant au moins une portion de retenue (21)10 (4,5) having an active face (6) extending perpendicular to the axial direction of the coil and lateral external faces (20) turned towards adjacent walls of the housing (1) the lateral external faces (20) of the core (4,5) comprising at least one retaining portion (21) 15. s'étendant selon une direction formant un angle avec la direction axiale de la bobine, un organe de retenue (31) non magnétique solidaire du boîtier (1) étant disposé par rapport à la portion de retenue (21) pour s'opposer à un mou- ve ent des tôles du noyau (4,5) par rapport au boîtier (1)15 . extending in a direction forming an angle with the axial direction of the coil, a non-magnetic retaining member (31) integral with the housing (1) being disposed relative to the retaining portion (21) to oppose a movement of the core sheets (4,5) relative to the housing (1) 20 selon la direction axiale de la bobine, caractérisé en ce que la portion de retenue s'étend en saillie de la face externe latérale (20) selon une direction formant avec la direction axiale de la bobine un angle (B) inférieur à 90 degrés .20 in the axial direction of the coil, characterized in that the retaining portion projects from the lateral external face (20) in a direction forming with the axial direction of the coil an angle (B) of less than 90 degrees . 25 2. Actionneur électromagnétique selon la revendication 1, caractérisé en ce que la portion de retenue (21) s'étend de façon adjacente à une arête du noyau (4,5) formée par les faces externes latérales (20) et une face externe arrière (19) du noyau (4,5) .2. An electromagnetic actuator according to claim 1, characterized in that the retaining portion (21) extends adjacent to an edge of the core (4,5) formed by the lateral external faces (20) and an external face rear (19) of the core (4,5). 30 3. Actionneur électromagnétique selon la revendication 1, caractérisé en ce que la portion de retenue (21) s'étend sur au moins un quart de la face externe latérale (20) .30 3. Electromagnetic actuator according to claim 1, characterized in that the retaining portion (21) extends over at least a quarter of the lateral external face (20). 4. Actionneur électromagnétique selon la revendica-4. Electromagnetic actuator according to the claim 35 tion 1, caractérisé en ce que l'organe de retenue comprend une pièce (2,3) moulée sur le noyau (4,5) et s'étendant en contact des portions de retenue des faces externes latérales (20) du noyau (4,5).35 tion 1, characterized in that the retaining member comprises a part (2,3) molded on the core (4,5) and extending in contact with the retaining portions of the lateral external faces (20) of the core (4,5). 5. Actionneur électromagnétique selon la revendica- tion 4, caractérisé en ce que la pièce moulée (2,3) forme au moins une partie du boîtier (1) .5. Electromagnetic actuator according to claim 4, characterized in that the molded part (2,3) forms at least part of the housing (1). 6. Actionneur électromagnétique selon la revendication 4, caractérisé en ce que la pièce moulée est réalisé dans un matériau thermiquement conducteur. 6. Electromagnetic actuator according to claim 4, characterized in that the molded part is made of a thermally conductive material. 7. Actionneur électromagnétique selon la revendication 1, caractérisé en ce que la tige (15) de l'organe d' actionnement (30) est montée coulissante dans un guide (22) solidaire du boîtier (1) et s'étendant dans un passage traversant (24) du noyau (5) . 7. electromagnetic actuator according to claim 1, characterized in that the rod (15) of the actuating member (30) is slidably mounted in a guide (22) integral with the housing (1) and extending in a passage through (24) of the core (5). 8. Actionneur électromagnétique selon la revendication 7, caractérisé en ce que le guide (22) est supporté par un insert (23) s'étendant dans un logement (26) interne du noyau (5) t l' insert (23) étant disposé pour recouvrir une extrémité du passage (24) traversant le noyau (5) . 8. Electromagnetic actuator according to claim 7, characterized in that the guide (22) is supported by an insert (23) extending in a housing (26) internal to the core (5) t the insert (23) being disposed to cover one end of the passage (24) passing through the core (5). 9. Actionneur électromagnétique selon la revendication 8, caractérisé en ce que l' insert (23) est réalisé dans un matériau ferromagnétique et est en contact avec le noyau le long du logement (26) . 9. An electromagnetic actuator according to claim 8, characterized in that the insert (23) is made of a ferromagnetic material and is in contact with the core along the housing (26).
PCT/FR2002/000724 2001-03-02 2002-02-28 Electromagnetic actuator Ceased WO2002071420A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT02706905T ATE435496T1 (en) 2001-03-02 2002-02-28 ELECTROMAGNETIC ACTUATOR
EP02706905A EP1364377B1 (en) 2001-03-02 2002-02-28 Electromagnetic actuator
DE60232780T DE60232780D1 (en) 2001-03-02 2002-02-28 ELECTROMAGNETIC ACTUATOR

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR01/02880 2001-03-02
FR0102880 2001-03-02

Publications (1)

Publication Number Publication Date
WO2002071420A1 true WO2002071420A1 (en) 2002-09-12

Family

ID=8860674

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2002/000724 Ceased WO2002071420A1 (en) 2001-03-02 2002-02-28 Electromagnetic actuator

Country Status (4)

Country Link
EP (1) EP1364377B1 (en)
AT (1) ATE435496T1 (en)
DE (1) DE60232780D1 (en)
WO (1) WO2002071420A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9240269B2 (en) 2011-09-17 2016-01-19 Bischoff Technologie-Management Gmbh Solenoid actuator, use of a solenoid actuator and braking or clamping device for linearly moving and/or axially rotating components

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5155461A (en) * 1991-02-08 1992-10-13 Diesel Technology Corporation Solenoid stator assembly for electronically actuated fuel injectors and method of manufacturing same
WO2000033329A1 (en) * 1998-12-03 2000-06-08 Siemens Automotive Corporation Electromagnetic actuator with improved lamination core-housing connection
EP1050890A2 (en) * 1999-05-03 2000-11-08 Bayerische Motoren Werke Aktiengesellschaft Electromagnet with a stack of laminations
FR2793596A1 (en) * 1999-05-14 2000-11-17 Siemens Ag ELECTROMAGNETIC POSITION CONTROL DEVICE
WO2000070197A1 (en) * 1999-05-14 2000-11-23 Siemens Aktiengesellschaft Electromechanical actuator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5155461A (en) * 1991-02-08 1992-10-13 Diesel Technology Corporation Solenoid stator assembly for electronically actuated fuel injectors and method of manufacturing same
WO2000033329A1 (en) * 1998-12-03 2000-06-08 Siemens Automotive Corporation Electromagnetic actuator with improved lamination core-housing connection
EP1050890A2 (en) * 1999-05-03 2000-11-08 Bayerische Motoren Werke Aktiengesellschaft Electromagnet with a stack of laminations
FR2793596A1 (en) * 1999-05-14 2000-11-17 Siemens Ag ELECTROMAGNETIC POSITION CONTROL DEVICE
WO2000070197A1 (en) * 1999-05-14 2000-11-23 Siemens Aktiengesellschaft Electromechanical actuator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9240269B2 (en) 2011-09-17 2016-01-19 Bischoff Technologie-Management Gmbh Solenoid actuator, use of a solenoid actuator and braking or clamping device for linearly moving and/or axially rotating components

Also Published As

Publication number Publication date
DE60232780D1 (en) 2009-08-13
EP1364377B1 (en) 2009-07-01
EP1364377A1 (en) 2003-11-26
ATE435496T1 (en) 2009-07-15

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