EP0174322B1 - Multipolar magnetization device - Google Patents

Multipolar magnetization device Download PDF

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Publication number
EP0174322B1
EP0174322B1 EP85900966A EP85900966A EP0174322B1 EP 0174322 B1 EP0174322 B1 EP 0174322B1 EP 85900966 A EP85900966 A EP 85900966A EP 85900966 A EP85900966 A EP 85900966A EP 0174322 B1 EP0174322 B1 EP 0174322B1
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portions
conductors
magnetization
conductor
groups
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German (de)
French (fr)
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EP0174322A1 (en
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Claude Oudet
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Portescap SA
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Portescap SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/003—Methods and devices for magnetising permanent magnets

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  • the present invention relates to a multipolar supply device for forming, on at least one surface of a magnetizable body, a series of magnetized zones, having successively alternating polarities, comprising at least one source of electrical energy, at least one device current pulse generator connected to this source, and several portions of elongated electrical conductors, connected to said pulse generator device and arranged so as to create magnetic fields producing the magnetization of said zones, device in which said portions of conductors are arranged so that the magnetization of each zone is produced by the magnetic field generated by at least four portions of conductors and so that at least a portion of the portions of conductors connected to the pulse generator device forms a group at inside which these portions are connected together in series.
  • Such a device is described, for example, in the document JP-A-575,313, which shows the usual arrangement consisting in supplying the conductors from a single current pulse generator, the voltage of which must be sufficiently high. to create the necessary magnetization current.
  • Devices of this type generally have major drawbacks, in particular when it comes to producing on a body of small dimensions, such as a stepper motor rotor, a large number of magnetized zones. , for example in order to achieve, in the case of such an engine, a high number of steps.
  • the number of zones to be magnetized increases for a given volume or surface of the corresponding body, the usable copper section and the space available for the insulation of the conductors are reduced accordingly. It follows, on the one hand, that the problem of the heating of the device quickly becomes critical, and that, on the other hand, the admissible working voltage decreases due to the risk of breakdown.
  • the homogeneity of the magnetization of the different zones is not satisfactory.
  • the portions of conductors producing the respective magnetization fields in practice always have variations in section, therefore of electrical resistance, and thus conduct different magnetization currents.
  • the usual supply, in parallel, of the conductors or groups of conductors does not ensure sufficient homogeneity from the moment when it is no longer possible, in particular for reasons of heating, to saturate the zones to be magnetized by excess current.
  • An additional drawback stems from the fact that the usual power supply makes fault detection due to breakdown very difficult, the corresponding variations in current level being very small.
  • the portions of conductors which produce the magnetization of the different zones form two groups connected in parallel to a pulse generator device, these groups each acting on the whole areas to be magnetized.
  • the working voltage and the maximum magnetization current are limited accordingly, in accordance with the considerations mentioned above on this subject. , which is a major drawback.
  • this device has the drawback of having loops of imperfect conductors around the zones to be magnetized at the point of entry and exit of the conductors for connection to the pulse generator device. This leads to a significant difference in the magnetization of these zones compared to the other zones and, consequently, to an asymmetry compared to the center or a symmetry compared to only one axis of the magnetized part, which is not desirable in most applications.
  • the object of the invention is to remedy the defects and limitations of known magnetization devices, and in particular to provide a device of the type mentioned at the start which makes it possible to magnetize a large number of zones over a reduced space, in a very homogeneous manner. .
  • the device according to the invention is characterized in that it comprises several groups of portions of conductors each acting on part of all of the zones to be magnetized, that the groups are each connected to a device generating respective pulses producing substantially equal current pulses, and the groups are nested relative to each other so that the magnetization of each zone is produced by portions of conductors respectively connected to at least two generating devices d 'separate pulses.
  • the groups are offset from one another in the direction in which the magnetized zones succeed one another.
  • FIG. 1 is a diagram of the arrangement and of the supply of the electrical conductors of the magnetization device
  • FIG. 2 is a diagrammatic cross-section view along line II - II of FIG. 1, showing the magnetization of an area of the body to be magnetized, and
  • Figure 3 is a cross-sectional view of the device in working condition.
  • the device illustrated in Figures 1 to 3 is intended for the magnetization of a multipolar stepper motor rotor which is in the form of the annular disc 1 partially visible in section in Figure 2.
  • Elongated conductor portions such that 21 to 28, designated as a whole by 2 in FIG. 1, are arranged parallel to the disc in the radial direction of the latter so as to produce in the circumferential direction of the disc a series of magnetized zones in the transverse direction, c ' that is to say in the axial direction of the disc.
  • the magnetization device comprises two annular support parts 5, 51, made of a highly permeable material, such as an iron-cobalt alloy, between which is placed the magnetizing disc 1, flat, of small thickness compared to its diameter. and made for example in samarium-cobalt.
  • the support parts 5, 51 have respective plane polar surfaces opposite the disk 1 and each comprise a series of radial slots such as 3 and 4 in which the portions of corresponding electrical conductors are housed. These conductors are arranged and connected to sources. electric current as described below in relation to Figure 1.
  • Figure 1 shows the support part 5 in plan, the outer and inner edges of its annular surface defining the magnetized surface on the rotor disc.
  • this surface is constituted by a series of elongated zones, oriented radially, and having alternating polarities on each face of the disc.
  • FIG. 1 The section along line II - II of Figure 1 is shown in Figure 2.
  • Each of the adjacent slots 3,4 has a pair of conductor portions 21, 22 and 23, 24 respectively.
  • a similar arrangement of the support part 51 and of conductor portions 25, 26 and 27, 28 is placed opposite the first so as to form a gap 6 in which the disk 1 to be magnetized is arranged.
  • the ends of the radial conductor portions are connected as shown in FIG. 1 so as to form groups of conductor portions connected in series, the ends of each of these groups being connected to the terminals of a respective pulse generator device. not shown.
  • the ends of the different groups associated with part 5 have been designated respectively by E 1 ' 5 1 ; E 2 , S 2 ; E3, Ss; ...; E lo , S 10 .
  • Each group has twenty portions of conductors and the support has a total of one hundred slots such as 3 or 4.
  • the different groups are offset with respect to each other so that in each slot are housed portions of conductors belonging to two different groups, these portions being connected to be traversed in the same direction by the magnetization current.
  • the groups overlap by half their angular extent.
  • the conductors of the opposite part 51 are arranged in a similar manner, an additional offset for example of a quarter of their angular extent being preferably provided between the respective groups of the two support parts arranged opposite.
  • the various pulse generating devices are arranged to supply current pulses of the same amplitude and the same duration.
  • they essentially comprise a capacitor, a load resistor connected in series and a switch device arranged to connect the capacitor for a determined period of time at the terminals of the group of corresponding portions of conductors.
  • the capacitor is preferably charged from an energy source common to all of the pulse generating devices.
  • each pair of portions of conductors is traversed by a current of the same direction coming from two different pulse generators.
  • Each conductor portion of a pair is connected in series with a conductor portion housed in the adjacent slot of the same support part so that the currents flowing in the conductor portions housed in adjacent slots are in opposite directions.
  • the currents flowing in pairs of portions of conductors housed in slots arranged opposite one another are directed in the same direction.
  • zone 11 of the disc 1 has for example the direction indicated in this figure by the arrows and, consequently, the magnetization of a zone 11 of the disc 1, delimited by dotted lines, is carried out in the transverse direction of the disc by revealing poles of opposite names on each of its surfaces. It also appears from FIG. 2 that the zones adjacent to the zone 11 on each side of the latter, that is to say the zones 12 and 13 partially visible, are magnetized parallel but in the opposite direction with respect to the magnetization of zone 11.
  • each zone is produced by currents flowing in several portions of conductors, eight in the present example corresponding to at least two, here four, groups supplied respectively from separate pulse-generating devices, the influence of the difference between the currents becomes negligible, so that excellent homogeneity magnetization from one zone to another can be achieved.
  • the arrangement according to FIG. 1 also has the advantage that the external connections between the different portions of conductors are made so that a closed loop is formed around each zone to be magnetized, parallel to the corresponding surface of the disc to be magnetized. This allows a particularly efficient use of the magnetization current.
  • the groups of overlapping portions of conductors are oriented in the opposite direction with respect to their connections to the respective pulse generator devices.
  • group E 6 S 6 for example, the current flows in a peripheral direction in the clockwise direction
  • groups E 2 , S 2 , and E 3 , S 3 which cooperate with this group Eg , Se, the current in the peripheral direction flows in the opposite direction.
  • the connections to the pulse generating devices are only shown diagrammatically in FIG. 3 but it is obvious that in this case also the loop can be easily closed by an appropriate configuration of the conductors as shown for example at the connections S 3 , E4.
  • the portions of elongated conductors are arranged in the slots so that their outer edges are at least approximately the same height as the edge of the slot.
  • FIG. 3 shows, in axial section, a practical embodiment of the present magnetization device.
  • the annular support parts 5 and 51 provided with slots such as 3 for the magnetization current conductors.
  • the conductors themselves are not visible, the parts surrounding the supports being embedded in a plastic material, forming parts 52, 53, 54, 55.
  • each of the support parts 5 and 51 is integral with a respective assembly 31, 32, these assemblies being axially separable to allow the positioning of the part to be magnetized 1, and are placed in the position of FIG. 3 during the magnetization operation of the device.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Abstract

The magnetization device comprises an electric power source, at least two current pulse generator devices connected to said source and a plurality of elongated electric conductor parts (21 to 28) connected and arranged so that the magnetization of each zone (11) is produced by the magnetic field generated by at least four conductor parts connected to at least two distinct pulse generator devices producing substantially equal current pulses.

Description

La présente invention concerne un dispositif d'aimentation multipolaire pour former, sur au moins une surface d'un corps aimantable, une série de zone aimantées, présentant successivement des polarités alternantes, comportant au moins une source d'énergie électrique, au moins un dispositif générateur d'impulsions de courant connecté à cette source, et plusieurs portions de conducteurs électriques allongées, connectées au dit dispositif générateur d'impulsions et disposées de façon à créer des champs magnétiques produisant l'aimantation desdites zones, dispositif dans lequel lesdites portions de conducteurs sont disposées de façon que l'aimantation de chaque zone soit produite par le champ magnétique engendré par au moins quatre portions de conducteurs et de façon qu'au moins une partie des portions de conducteurs connectées au dispositif générateur d'impulsions, forme un groupe à l'intérieur duquel ces portions sont connectées entre elles en série.The present invention relates to a multipolar supply device for forming, on at least one surface of a magnetizable body, a series of magnetized zones, having successively alternating polarities, comprising at least one source of electrical energy, at least one device current pulse generator connected to this source, and several portions of elongated electrical conductors, connected to said pulse generator device and arranged so as to create magnetic fields producing the magnetization of said zones, device in which said portions of conductors are arranged so that the magnetization of each zone is produced by the magnetic field generated by at least four portions of conductors and so that at least a portion of the portions of conductors connected to the pulse generator device forms a group at inside which these portions are connected together in series.

Un tel dispositif est décrit, par exemple, dans le document JP-A-575 313, qui montre l'agencement usuel consistant à alimenter les conducteurs à partir d'un générateur d'impulsions de courant unique, dont la tension doit être suffisamment élevée pour créer le courant d'aimantation nécessaire.Such a device is described, for example, in the document JP-A-575,313, which shows the usual arrangement consisting in supplying the conductors from a single current pulse generator, the voltage of which must be sufficiently high. to create the necessary magnetization current.

Les dispositifs de ce type présentent, d'une façon générale, des inconvénients majeurs, notamment lorsqu'il s'agit de produire sur un corps de faibles dimensions, tel qu'un rotor de moteur pas à pas, un grand nombre de zones aimantées, par exemple dans le but d'atteindre, dans le cas d'un tel moteur, un nombre de pas élevé. En effet, lorsque le nombre de zones à aimanter augmente pour un volume ou une surface donnés du corps correspondant, la section de cuivre utilisable et l'espace disponible pour l'isolation des conducteurs se trouvent réduits en conséquence. Il s'ensuit, d'une part, que le problème de l'échauffement du dispositif devient très vite critique, et que, d'autre part, la tension de travail admissible diminue en raison du risque de claquage. De plus, dans les dispositifs de ce type, l'homogénéité de l'aimantation des différentes zones n'est pas satisfaisante. En effet, les portions de conducteurs produisant les champs d'aimantation respectifs présentent en pratique toujours des variations de section, donc de résistance électrique, et conduisent ainsi des courants d'aimantation différents. L'alimentation usuelle, en parallèle, des conducteurs ou de groupes de conducteurs ne permet pas d'assurer une homogénéité suffisante dès le moment où il n'est plus possible, notamment pour des raisons d'échauffement, de saturer les zones à aimanter par un excès de courant. Un inconvénient supplémentaire provient du fait que l'alimentation habituelle rend la détection de pannes par suite de claquage très difficile, les variations de niveau de courant correspondantes étant très faibles.Devices of this type generally have major drawbacks, in particular when it comes to producing on a body of small dimensions, such as a stepper motor rotor, a large number of magnetized zones. , for example in order to achieve, in the case of such an engine, a high number of steps. In fact, when the number of zones to be magnetized increases for a given volume or surface of the corresponding body, the usable copper section and the space available for the insulation of the conductors are reduced accordingly. It follows, on the one hand, that the problem of the heating of the device quickly becomes critical, and that, on the other hand, the admissible working voltage decreases due to the risk of breakdown. In addition, in devices of this type, the homogeneity of the magnetization of the different zones is not satisfactory. In fact, the portions of conductors producing the respective magnetization fields in practice always have variations in section, therefore of electrical resistance, and thus conduct different magnetization currents. The usual supply, in parallel, of the conductors or groups of conductors does not ensure sufficient homogeneity from the moment when it is no longer possible, in particular for reasons of heating, to saturate the zones to be magnetized by excess current. An additional drawback stems from the fact that the usual power supply makes fault detection due to breakdown very difficult, the corresponding variations in current level being very small.

Plus particulièrement, dans le dispositif selon le document JP-A-575 313, les portions de conducteurs qui produisent l'aimantation des différentes zones, forment deux groupes connectées en parallèle à un dispositif générateur d'impulsions, ces groupes agissant chacun sur la totalité des zones à aimanter. De ce fait, pour une section de cuivre maximale des portions de conducteurs, déterminée par les impératifs constructifs sus-mentionnés, la tension de travail et le courant d'aimantation maximale's se trouvent limités en conséquence, conformément aux considérations évoquées plus haut à ce sujet, ce qui constitue un inconvénient majeur.More particularly, in the device according to document JP-A-575,313, the portions of conductors which produce the magnetization of the different zones, form two groups connected in parallel to a pulse generator device, these groups each acting on the whole areas to be magnetized. As a result, for a maximum cross-section of copper of the portions of conductors, determined by the above-mentioned constructive requirements, the working voltage and the maximum magnetization current are limited accordingly, in accordance with the considerations mentioned above on this subject. , which is a major drawback.

En outre, ce dispositif présente l'inconvénient de comporter des boucles de conducteurs imparfaites autour des zones à aimanter à l'endroit de l'entrée et de la sortie des conducteurs de connexion au dispositif générateur d'impulsions. Ceci conduit à une différence sensible dans l'aimantation de ces zones par rapport aux autres zones et, par conséquent, à une asymétrie par rapport au centre ou une symétrie par rapport à un seul axe de la pièce aimantée, ce qui n'est pas souhaitable dans la plupart des applications.In addition, this device has the drawback of having loops of imperfect conductors around the zones to be magnetized at the point of entry and exit of the conductors for connection to the pulse generator device. This leads to a significant difference in the magnetization of these zones compared to the other zones and, consequently, to an asymmetry compared to the center or a symmetry compared to only one axis of the magnetized part, which is not desirable in most applications.

L'invention a pour but de remédier aux défauts et aux limitations des dispositifs d'aimantation connus, et notamment de fournir un dispositif du type mentionné au début qui permette d'aimanter un grand nombre de zones sur un espace réduit, de façon très homogène.The object of the invention is to remedy the defects and limitations of known magnetization devices, and in particular to provide a device of the type mentioned at the start which makes it possible to magnetize a large number of zones over a reduced space, in a very homogeneous manner. .

A cet effet, le dispositif selon l'invention est caractérisé en ce qu'il comporte plusieurs groupes de portions de conducteurs agissant chacun sur une partie de l'ensemble des zones à aimanter, que les groupes sont connectés chacun à un dispositif générateur d'impulsions respectif produisant des impulsions de courant sensiblement égales, et que les groupes sont imbriqués l'un par rapport à l'autre de façon que l'aimantation de chaque zone soit produite par des portions de conducteurs connectées respectivement à au moins deux dispositifs générateurs d'impulsions distincts.To this end, the device according to the invention is characterized in that it comprises several groups of portions of conductors each acting on part of all of the zones to be magnetized, that the groups are each connected to a device generating respective pulses producing substantially equal current pulses, and the groups are nested relative to each other so that the magnetization of each zone is produced by portions of conductors respectively connected to at least two generating devices d 'separate pulses.

Ces mesures permettent notamment de réduire la tension de travail pour un courant d'aimantation donné, ou d'augmenter ce courant lorqu'on utilise la même tension que dans les dispositifs connus, avec les avantages respectifs qui en résultent selon les remarques faites plus haut.These measures make it possible in particular to reduce the working voltage for a given magnetization current, or to increase this current when the same voltage is used as in known devices, with the respective advantages which result therefrom according to the remarks made above. .

Conformément à une forme d'exécution préférée du dispositif, dans au moins une partie desdits groupes de portions de conducteurs, les groupes sont décalés les uns par rapport aux autres dans le sens dans lequel se succèdent les zones aimantées.According to a preferred embodiment of the device, in at least part of said groups of conductor portions, the groups are offset from one another in the direction in which the magnetized zones succeed one another.

Une telle disposition permet d'obtenir une très bonne homogénéité de l'aimantation de l'ensemble de la pièce traitée, tel que cela apparaîtra clairement de l'exposé qui suit. D'autres particularités et avantages de l'invention ressortiront également de la description donnée ci-après et du dessin annexé qui illustre un example de réalisation du présent dispositif.Such an arrangement makes it possible to obtain very good homogeneity of the magnetization of the whole of the treated part, as will become clear from the description which follows. Other features and advantages of the invention will also emerge from the description given below and from the appended drawing which illustrates an exemplary embodiment of the present device.

Dans le dessin, la figure 1 est un schéma de la disposition et de l'alimentation des conducteurs électriques du dispositif d'aimantation,In the drawing, FIG. 1 is a diagram of the arrangement and of the supply of the electrical conductors of the magnetization device,

la figure 2 est une vue en coupe transversale, schématique, le long de la ligne II - Il de la figure 1, montrant l'aimantation d'une zone du corps à aimanter, etFIG. 2 is a diagrammatic cross-section view along line II - II of FIG. 1, showing the magnetization of an area of the body to be magnetized, and

la figure 3 est une vue en coupe transversale du dispositif en état de fonctionnement.Figure 3 is a cross-sectional view of the device in working condition.

Le dispositif illustré dans les figures 1 à 3 est destiné à l'aimantation d'un rotor de moteur pas à pas multipolaire qui se présente sous forme du disque annulaire 1 partiellement visible en coupe dans la figure 2. Des portions de conducteurs allongées telles que 21 à 28, désignées dans leur ensemble par 2 dans la figure 1, sont disposées parallèlement au disque dans la direction radiale de celui-ci de manière à produire dans le sens circonférentiel du disque une série de zones aimantées dans la direction transversale, c'est-à-dire dans la direction axiale du disque.The device illustrated in Figures 1 to 3 is intended for the magnetization of a multipolar stepper motor rotor which is in the form of the annular disc 1 partially visible in section in Figure 2. Elongated conductor portions such that 21 to 28, designated as a whole by 2 in FIG. 1, are arranged parallel to the disc in the radial direction of the latter so as to produce in the circumferential direction of the disc a series of magnetized zones in the transverse direction, c ' that is to say in the axial direction of the disc.

Le dispositif d'aimantation comporte deux parties de support annulaires 5, 51, en un matériau hautement perméable, tel qu'un alliage fer-cobalt, entre lesquelles est placé le disque à aimanter 1, plat, de faible épaisseur par rapport à son diamètre et réalisé par exemple en samarium-cobalt. Les parties de support 5, 51 présentent en regard du disque 1 des surfaces polaires planes respectives et comportent chacune une série de fentes radiales telles que 3 et 4 dans lesquelles sont logées les portions de conducteurs électriques correspondantes ces conducteurs sont agencés et connectés à des sources de courant électrique de la façon décrite ci-après en rapport avec la figure 1.The magnetization device comprises two annular support parts 5, 51, made of a highly permeable material, such as an iron-cobalt alloy, between which is placed the magnetizing disc 1, flat, of small thickness compared to its diameter. and made for example in samarium-cobalt. The support parts 5, 51 have respective plane polar surfaces opposite the disk 1 and each comprise a series of radial slots such as 3 and 4 in which the portions of corresponding electrical conductors are housed. These conductors are arranged and connected to sources. electric current as described below in relation to Figure 1.

La figure 1 montre la partie de support 5 en plan, les bords extérieurs et intérieurs de sa surface annulaire définissant la surface aimantée sur le disque du rotor. Ainsi que cela ressortira de la suite de la description, cette surface est constituée par une série de zones allongées, orientées radialement, et présentant des polarités alternantes sur chaque face du disque.Figure 1 shows the support part 5 in plan, the outer and inner edges of its annular surface defining the magnetized surface on the rotor disc. As will become apparent from the following description, this surface is constituted by a series of elongated zones, oriented radially, and having alternating polarities on each face of the disc.

La coupe selon la ligne II - Il de la figure 1 est montrée à la figure 2. Chacune des fentes voisines 3,4 comporte une paire de portions de conducteurs 21, 22 et 23, 24 respectivement. Un arrangement analogue de la partie de support 51 et de portions de conducteur 25, 26 et 27, 28 est placé en regard du premier de façon à former un entrefer 6 dans lequel est disposé le disque 1 à aimanter. Les extrémités des portions radiales de conducteur sont reliées comme l'indique la figure 1 de manière à former des groupes de portions de conducteurs connectées en série, les extrémités de chacun de ces groupes étant branchées aux bornes d'un dispositif générateur d'impulsions respectif non représenté. Sur la figure 1, les extrémités des différents groupes associés à la partie 5 ont été désignées respectivement par E1' 51; E2, S2; E3, Ss; ...; Elo, S10. Chaque groupe comporte vingt portions de conducteurs et le support présente au total cent fentes telles que 3 ou 4. Les différents groupes sont décalés l'un par rapport à l'autre de sorte que dans chaque fente sont logées des portions de conducteurs appartenant à deux groupes différents, ces portions étant connectées pour être parcourues dans le même sens par le courant d'aimantation. Dans l'exemple de la figure 1, les groupes se chevauchent de la moitié de leur étendue angulaire. Les conducteurs de la partie opposée 51 sont agencés de façon analogue, un décalage supplémentaire par exemple d'un quart de leur étendue angulaire étant de préférence prévu entre les groupes respectifs des deux parties de support disposées en regard.The section along line II - II of Figure 1 is shown in Figure 2. Each of the adjacent slots 3,4 has a pair of conductor portions 21, 22 and 23, 24 respectively. A similar arrangement of the support part 51 and of conductor portions 25, 26 and 27, 28 is placed opposite the first so as to form a gap 6 in which the disk 1 to be magnetized is arranged. The ends of the radial conductor portions are connected as shown in FIG. 1 so as to form groups of conductor portions connected in series, the ends of each of these groups being connected to the terminals of a respective pulse generator device. not shown. In FIG. 1, the ends of the different groups associated with part 5 have been designated respectively by E 1 ' 5 1 ; E 2 , S 2 ; E3, Ss; ...; E lo , S 10 . Each group has twenty portions of conductors and the support has a total of one hundred slots such as 3 or 4. The different groups are offset with respect to each other so that in each slot are housed portions of conductors belonging to two different groups, these portions being connected to be traversed in the same direction by the magnetization current. In the example in Figure 1, the groups overlap by half their angular extent. The conductors of the opposite part 51 are arranged in a similar manner, an additional offset for example of a quarter of their angular extent being preferably provided between the respective groups of the two support parts arranged opposite.

D'autre part, les différents dispositifs générateurs d'impulsions sont agencés pour fournir des impulsions de courant de même amplitude et de même durée. Ils comportent par exemple essentiellement un condensateur, une résistance de charge montée en série et un dispositif interrupteur agencé pour connecter le condensateur pendant une durée déterminée aux bornes du groupe de portions de conducteurs correspondant. Le condensateur est de préférence chargé à partir d'une source d'énergie commune à l'ensemble des dispositifs générateurs d'impulsions.On the other hand, the various pulse generating devices are arranged to supply current pulses of the same amplitude and the same duration. For example, they essentially comprise a capacitor, a load resistor connected in series and a switch device arranged to connect the capacitor for a determined period of time at the terminals of the group of corresponding portions of conductors. The capacitor is preferably charged from an energy source common to all of the pulse generating devices.

Il s'ensuit que, dans le schéma de la figure 2, chaque paire de portions de conducteurs est parcourue par un courant de même sens provenant de deux générateurs d'impulsions différents. Chaque portion de conducteur d'une paire est connectée en série avec une portion de conducteur logée dans la fente voisine de la même partie de support de sorte que les courants circulant dans les portions de conducteurs logées dans des fentes voisines soient de sens opposé. D'autre part, les courants circulant dans des paires de portions de conducteurs logées dans des fentes disposées en regard l'une de l'autre sont dirigés dans le même sens. Le champ magnétique créé par quatre paires de portions de conducteurs telles que montrées à la figure 2, a ainsi par exemple le sens indiqué dans cette figure par les flèches et, par conséquent, l'aimantation d'une zone 11 du disque 1, délimitée par des traits pointillés, s'effectue dans le sens transversal du disque en faisant apparaître des pôles de noms opposés sur chacune des surfaces de celui-ci. Il ressort également de la figure 2 que les zones adjacentes à la zone 11 de chaque côté de celle-ci, c'est à dire les zones 12 et 13 partiellement visibles, sont aimantées parallèlement mais en sens inverse par rapport à l'aimantation de la zone 11.It follows that, in the diagram of FIG. 2, each pair of portions of conductors is traversed by a current of the same direction coming from two different pulse generators. Each conductor portion of a pair is connected in series with a conductor portion housed in the adjacent slot of the same support part so that the currents flowing in the conductor portions housed in adjacent slots are in opposite directions. On the other hand, the currents flowing in pairs of portions of conductors housed in slots arranged opposite one another are directed in the same direction. The magnetic field created by four pairs of portions of conductors as shown in FIG. 2, has for example the direction indicated in this figure by the arrows and, consequently, the magnetization of a zone 11 of the disc 1, delimited by dotted lines, is carried out in the transverse direction of the disc by revealing poles of opposite names on each of its surfaces. It also appears from FIG. 2 that the zones adjacent to the zone 11 on each side of the latter, that is to say the zones 12 and 13 partially visible, are magnetized parallel but in the opposite direction with respect to the magnetization of zone 11.

Grâce au fait que l'aimantation de chaque zone est produite par courants circulant dans plusieurs portions de conducteurs, huit dans le présent exemple correspondant à au moins deux, ici quatre, groupes alimentés respectivement à partir de dispositifs générateurs d'impulsions distincts, l'influence de la différence entre les courants devient négligeable, de sorte qu'une excellente homogénéité de l'aimantation d'une zone à l'autre peut être réalisée.Thanks to the fact that the magnetization of each zone is produced by currents flowing in several portions of conductors, eight in the present example corresponding to at least two, here four, groups supplied respectively from separate pulse-generating devices, the influence of the difference between the currents becomes negligible, so that excellent homogeneity magnetization from one zone to another can be achieved.

Il est à noter également que l'alimentation séparée des différents groupes permet de travailler avec une tension d'alimentation considérablement réduite, ce qui est important pour la solution du problème de l'isolation des conducteurs et de l'utilisation optimale de l'espace disponible pour les conducteurs eux- mêmes.It should also be noted that the separate supply of the different groups makes it possible to work with a considerably reduced supply voltage, which is important for the solution of the problem of the insulation of the conductors and the optimal use of space. available for the drivers themselves.

La disposition selon la figure 1 présente en outre l'avantage que les connexions extérieures entre les différentes portions de conducteurs sont réalisées de façonr qu'une boucle fermée soit formée autour de chaque zone à aimanter, parallèlement à la surface correspondante du disque à aimanter. Ceci permet une utilisation particulièrement efficace du courant d'aimantation. Pour obtenir ces boucles fermées dans l'exemple représenté, les groupes de portions de conducteurs qui se chevauchent sont orientés en sens inverse par rapport à leurs connexions aux dispositifs générateurs d'impulsions respectifs. Ainsi, dans le groupe E6, S6 par exemple, le courant circule en direction périphérique dans le sens des aiguilles de montre, alors que dans les groupes E2, S2, et E3, S3 qui coopèrent avec ce groupe Eg, Se, le courant en direction périphérique circule dans le sens inverse. Les connexions aux dispositifs générateurs d'impulsions ne sont représentés que schématiquement dans la figure 3 mais il est évident que dans ce cas également la boucle peut être aisément fermée par une configuration appropriée des conducteurs telle que montrée par exemple aux connexions S3, E4.The arrangement according to FIG. 1 also has the advantage that the external connections between the different portions of conductors are made so that a closed loop is formed around each zone to be magnetized, parallel to the corresponding surface of the disc to be magnetized. This allows a particularly efficient use of the magnetization current. To obtain these closed loops in the example shown, the groups of overlapping portions of conductors are oriented in the opposite direction with respect to their connections to the respective pulse generator devices. Thus, in group E 6 , S 6 for example, the current flows in a peripheral direction in the clockwise direction, while in groups E 2 , S 2 , and E 3 , S 3 which cooperate with this group Eg , Se, the current in the peripheral direction flows in the opposite direction. The connections to the pulse generating devices are only shown diagrammatically in FIG. 3 but it is obvious that in this case also the loop can be easily closed by an appropriate configuration of the conductors as shown for example at the connections S 3 , E4.

Pour réduire les pertes d'énergie magnétique utile et augmenter ainsi l'efficacité du présent dispositif, les portions de conducteurs allongés, de préférence de section rectangulaire plate utilisant de façon optimale l'espace disponible comme montré à la figure 2, sont disposées dans les fentes de façon que leurs bords extérieurs soient au moins approximativement à la même hauteur que le bord de la fente.To reduce the losses of useful magnetic energy and thus increase the efficiency of the present device, the portions of elongated conductors, preferably of flat rectangular section making optimum use of the space available as shown in FIG. 2, are arranged in the slots so that their outer edges are at least approximately the same height as the edge of the slot.

La figure 3 montre, en coupe axiale, une réalisation pratique du présent dispositif d'aimantation. On y distingue notamment les parties de support annulaires 5 et 51 munies de fentes telles que 3 pour les conducteurs de courant d'aimantation. Les conducteurs eux- mêmes ne sont pas visibles, les parties entourant les supports étant noyées dans une matière plastique, formant des parties 52, 53, 54, 55. Comme le montre également la figure 3, chacune des parties de support 5 et 51 est solidaire d'un ensemble respectif 31, 32, ces ensembles étant séparables axialement pour permettre la mise en place de la pièce à aimanter 1, et sont placées dans la position de la figure 3 lors de l'opération d'aimantation du dispositif.Figure 3 shows, in axial section, a practical embodiment of the present magnetization device. There are in particular the annular support parts 5 and 51 provided with slots such as 3 for the magnetization current conductors. The conductors themselves are not visible, the parts surrounding the supports being embedded in a plastic material, forming parts 52, 53, 54, 55. As also shown in FIG. 3, each of the support parts 5 and 51 is integral with a respective assembly 31, 32, these assemblies being axially separable to allow the positioning of the part to be magnetized 1, and are placed in the position of FIG. 3 during the magnetization operation of the device.

Claims (5)

1. Multipolar magnetization device for forming on at least one surface of a magnetizable body a series of magnetized zones (11; 12, 13), having successively alternating polarities, comprising at least one source of electric power, at least one current pulse generating device connected to this source, and several elongated portions (21, 22, 23, 24...) of electric conductors connected to said pulse generating device and arranged so as to create magnetic fields producing the magnetizaton of said zones, device in which said portions of conductors are disposed in such a manner that the magnetization of each zone (11) is produced by the magnetic field generated by at least four portions of conductors (21, 22, 23, 24) and that at least one part of the portions of conductors connected (between E1 and S1) to the pulse generating device forms a group in which these portions are connected in series between themselves, characterized in that it comprises several groups of conductor portions (Ei, Sf; E2, S2; E3, S3;...), acting each on a part of the entirety of the zones to magnetize, that the groups are each connected to a respective pulse generating device producing substantially equal current pulses, and that the groups are overlapping each other in such a manner that the magnetization of each zone (11) is produced by conductor portions (21, 23; 22, 24) respectively connected to at least two distinct pulse generating devices.
2. Device according to claim 1, characterized in that in at least one part of the said group of conductor portions, the groups (E1,S1; E8, 58; E7, 57) are shifted with respect to each other in the direction in which the magnetized zones follow one another.
3. A device according to claim 1 or 2 for magnetizing transversally a flat body (1) having two plane parallel surfaces and being of a small thickness in relation to the dimensions of these surfaces, characterized in that said portions of conductors are disposed in such a manner that the magnetization of each zone is produced by the magnetic field created by at least eight portions of conductors (21 to 28) disposed in pairs, the portions of each pair (such as 21, 22) being placed parallely one close to the other, a first (21, 22) and a second (25, 26) pair being disposed on either side of the flat body (1) to magnetize so as to be parallel to the plane surfaces thereof, and a third (23, 24) and a fourth (27,28) pair being disposed in a similar way at a certain linear or angular distance from respectively the first and the second pair, each portion of conductor being connected in series with a portion of conductor of at least one adjoining pair disposed on the same side of the flat body to magnetize.
4. A device according to one of the preceding claims, characterized in that said portions of electric conductors (21) have a substantially rectangular, flat section, and are arranged in notches in a support of a high magnetic permeability, which are deeper than wide, in such a manner that the edge of a portion of conductor arranged in the vicinity of the opening of the notch in which this portion is lodged, is placed substantially at the same level as the edge of the notch.
5. A device according to one of the preceding claims, characterized in that several pulse generating devices are supplied with power in parallel from a same electric power source.
EP85900966A 1984-02-22 1985-02-22 Multipolar magnetization device Expired EP0174322B1 (en)

Applications Claiming Priority (2)

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CH850/84 1984-02-22
CH85084 1984-02-22

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EP0174322B1 true EP0174322B1 (en) 1989-01-04

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EP (1) EP0174322B1 (en)
JP (1) JPS61501734A (en)
KR (1) KR920010842B1 (en)
DE (1) DE3567311D1 (en)
FR (1) FR2559945B1 (en)
WO (1) WO1985003801A1 (en)

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DE3567311D1 (en) 1989-02-09
JPS6343882B2 (en) 1988-09-01
FR2559945A1 (en) 1985-08-23
US4737753A (en) 1988-04-12
JPS61501734A (en) 1986-08-14
KR850700286A (en) 1985-12-26
FR2559945B1 (en) 1988-08-19
KR920010842B1 (en) 1992-12-19
WO1985003801A1 (en) 1985-08-29
EP0174322A1 (en) 1986-03-19

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