EP3018664B1 - Noyau magnétique pour un dispositif d'induction électrique - Google Patents

Noyau magnétique pour un dispositif d'induction électrique Download PDF

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Publication number
EP3018664B1
EP3018664B1 EP14192071.0A EP14192071A EP3018664B1 EP 3018664 B1 EP3018664 B1 EP 3018664B1 EP 14192071 A EP14192071 A EP 14192071A EP 3018664 B1 EP3018664 B1 EP 3018664B1
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EP
European Patent Office
Prior art keywords
yoke
laminated
core
pressing
winding
Prior art date
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Active
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EP14192071.0A
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German (de)
English (en)
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EP3018664A1 (fr
Inventor
Jörg FINDEISEN
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Siemens Energy Global GmbH and Co KG
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Siemens AG
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Priority to EP14192071.0A priority Critical patent/EP3018664B1/fr
Publication of EP3018664A1 publication Critical patent/EP3018664A1/fr
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    • 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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together

Definitions

  • the invention relates to a magnetic core for an electrical induction device with the features according to the preamble of patent claim 1.
  • Such a magnetic core is from the WO 2011/133391 already known.
  • the magnetic core shown there has three legs that are connected to each other by an upper and a lower yoke.
  • the legs and the yokes are composed of laminated cores, the laminated cores abutting one another, so that their outer contour forms a step.
  • the centers of the laminated cores of one of the legs lie on a straight line.
  • the centers of the laminated cores are offset from one another.
  • Three-phase transformers are known from the field of electrical power distribution technology, in which the iron core consists of legs lying in one plane and of upper and lower yoke beams which connect the legs. The legs are surrounded by windings that are insulated from each other and from earth. In order to easily control the radial winding forces that occur in the event of a short circuit, windings with circular coils, which are placed on the legs of the transformer core, are preferred for power transformers of the type described. In order to achieve a high filling factor for the core leg (optimal filling of the circular cross-section of the winding with magnetic material), the cross-section of the legs is usually circular with a multi-step edge. In the case of three-leg three-phase transformers, the gradation of the leg is usually continued in the yoke to obtain the same cross-section for each step across the entire magnetic circuit and to ensure a smooth magnetic flux.
  • the object of the invention is to achieve a magnetic flux which is better than that of the prior art in stepped magnetic cores.
  • At least one of the legs of the magnetic core carries a winding and this leg carrying the winding is circular in cross-section with a stepped outer edge and the centers of the laminated cores of this leg lie on a straight line and in at least one of those adjacent to this leg Yokes of the laminated cores are aligned in such a way that the laminated core of the outer laminated core is offset in relation to the central laminated core in the direction of this leg to form a yoke cross-sectional area in which the geometric center of gravity is shifted in the direction of this leg relative to the center of the laminated core.
  • a significant advantage of the magnetic core is that it is due to the grading of the laminations in the yoke or yokes provided by the invention or by the change from a circular yoke cross section at the leg interface to a magnetic path that is reduced from step to step (compared to conventional ones) Magnetic cores with a circular yoke cross-section) and therefore the required core sheet material can be reduced and weight reduced.
  • the reduction in the core sheet material advantageously also leads to a reduction in the magnetic reversal losses. Also can be Avoid steps in the area of the yoke edge facing the leg, so that the number of electrical peaks that occur can be reduced (compared to conventional magnetic cores).
  • the laminated core of the outer laminated cores are offset in the direction of the leg in such a way that the laminated core of the outer laminated core is closer to the leg than the laminated core of the middle laminated core.
  • the laminated cores are pressed together by means of a pressing device which has at least two pressing units, of which at least one pressing unit, preferably the pressing unit or a pressing unit close to the leg, compresses all the laminating stacks of the yoke and at least one pressing unit, preferably the one or a distal leg Press unit, only compresses a subset of the sheet packs of the yoke.
  • a pressing device which has at least two pressing units, of which at least one pressing unit, preferably the pressing unit or a pressing unit close to the leg, compresses all the laminating stacks of the yoke and at least one pressing unit, preferably the one or a distal leg Press unit, only compresses a subset of the sheet packs of the yoke.
  • the laminated cores are preferably aligned in such a way that - viewed in cross-section and transverse to the stacking direction of the laminations - the centers of the laminated cores lie on a curvilinear curve which is axisymmetric with respect to the center of the central laminated core or the central laminated core.
  • the laminated cores form a straight yoke edge at the interface to the leg.
  • the laminated cores of the yoke and the leg face each other in pairs on the end edge side.
  • the step height of the step corresponds in each case to twice the step height of the step which the sheet metal packs of the leg lying opposite on the end edge side have.
  • the step on the side facing away from the leg corresponds to twice the offset of the laminated cores in the yoke or if the step in the area of the yoke corresponds to twice the step in the area of the leg.
  • the yoke and leg plates preferably have the same width for each step.
  • the cross-sectional areas of the yoke and leg are preferably of the same size.
  • each laminated core of the yoke is in each case preferably the same size as the laminated core height of the laminated core of the leg, which is opposite on the end edge side.
  • At least one of the press units of the yoke preferably has tensioning belts for transmitting the press force.
  • At least one of the pressing units has pressing bolts which press two pressing elements lying on the outside of the yoke and lying opposite one another, for example in the form of pressing bars, on the yoke.
  • the pressing units which each press a partial region of the yoke height are each provided with their own pressing bars which distribute the pressing force longitudinally in the yoke direction.
  • the press bars opposite the leg are directly connected to the winding support or the winding tensioning device.
  • the press bars of the yoke press unit remote from the leg are preferably spatially and non-positively separated from the winding support and winding tensioning device.
  • a press unit of at least one yoke is provided with press bars arranged along the yoke and if these press bars are each made of a metallic material and are at least partially provided on the side opposite the winding with a round end surface forming an electrical shield.
  • the distance between the round end surface and the winding edge the winding is preferably equal to or less than the distance from the yoke edge to the winding.
  • At least one support element is provided for the axial bracing of a winding located on the leg, which is at least partially beveled in the direction of the yoke, and the offset of the centers of the outer laminated core of the yoke is designed such that the gradation of the yoke follows the contour of the bevel of the support element.
  • the laminated cores of the yoke located under the winding are preferably displaced relative to the center of the central laminated core of the yoke in such a way that the yoke edge forms a line on the side facing the leg and the winding support for supporting the winding is at least partially supported directly on this yoke edge.
  • the Figure 1 shows a section of a magnetic core 1 for an electrical induction device.
  • the magnetic core 1 comprises an upper yoke 3, a lower yoke 4 and a leg 2 covered by a winding 10 of the induction device, which is arranged between the upper yoke 3 and the lower yoke 4.
  • the winding 10 of the induction device is placed on the leg 2.
  • the upper yoke 3 is formed by laminated cores 31 which are pressed onto one another by means of a pressing device 9.
  • the pressing device 9 comprises a lower pressing unit 91, which is arranged adjacent to the leg 2, and an upper one Press unit 92, which is spatially separated from leg 2 by press unit 91.
  • the two press units 91 and 92 in the exemplary embodiment according to FIG Figure 1 in each case two press beams 93, which by means of Figure 1 Press bolts, not shown, are pressed together.
  • the laminated cores 31 of the upper yoke 3 are in accordance with the magnetic core 1 Figure 1 aligned in such a way that the laminated core of the outer laminated core is offset in relation to the central laminated core in the direction of the leg 2 to form a yoke cross-sectional area in which the geometrical center of gravity FP is shifted in the direction of the leg 2 relative to the laminated core M of the central laminated core.
  • the mechanical tensioning of the winding 10 in the region of the leg 2 serves at the interface to the upper yoke 3 in the magnetic core 1 according to FIG Figure 1 a winding tensioning device 11, which comprises two support elements 110 and 111.
  • the two support elements 110 and 111 each have a sloping edge 112 in the direction of the center of the leg 2 or the center of the yoke of the upper yoke 3, to the course of which the lower yoke edge 32 of the upper yoke 3 is adapted.
  • the offset of the laminated cores 31 or the grading of the laminated cores 31 is as in FIG Figure 1 shown in the yoke edge area chosen accordingly.
  • the Figure 1 also shows the design of the lower yoke 4 in more detail. It can be seen that that lower yoke 4 is formed by laminated cores 41 which are pressed together by means of a pressing device 9.
  • the pressing device 9 comprises an upper pressing unit 91, which is arranged adjacent to the leg 2, as well as a pressing unit 92 arranged away from the leg 2.
  • the two press units 91 and 92 each have opposing press beams 93 which are pressed together by means of press bolts (not shown).
  • the laminated cores 41 are aligned in the lower yoke 4 in such a way that the laminated core of the outer laminated cores are offset in relation to the central laminated core in the direction of the leg 2 to form a yoke cross-sectional area, in which the geometrical center of gravity FP is opposite the central plate M of the central laminated core in the direction of Leg 2 is shifted.
  • the offset of the laminated cores 41 is also selected such that a straight yoke edge 42 is formed at the interface to the leg 2, on which a winding support 12, which carries the winding 10, rests.
  • the yoke edge of the lower yoke 4 facing the leg 2 is preferably straight, whereas the lower yoke edge 32 of the upper yoke 3 is preferably non-straight with a view to adapting the yoke edge to the support elements 110 and 111.
  • An insulation arrangement 101 is preferably provided between the winding support 12 and the winding and between the support elements 110 and 111.
  • the Figure 2 shows the cross section of the leg 2 of the magnetic core 1 according to Figure 1 in cross section. It can be seen that the leg 2 is formed from a large number of laminated cores 21. In cross section, the leg 2 is circular with a stepped outer edge. The centers of the laminated cores of the leg 2 lie on a straight line 22.
  • the Figure 3 shows in cross section a further embodiment for an upper yoke 3, which in accordance with the magnetic core 1 Figure 1 can be used. It can be seen that the centers of the laminated cores 31 lie on a curvilinear curve 36, which is preferably axially symmetrical with respect to the center of the upper yoke 3. In addition, the Figure 3 recognize that the area center of gravity FP of the upper yoke 3 is shifted in the direction of the lower yoke edge 32 relative to the center of the laminated core M of the central laminated core.
  • FIG. 4 shows again the lower yoke of the magnetic core 1 according to Figure 1 in cross section. It can be seen that the laminated core of the laminated core 41 of the lower yoke 4 lies on a curvilinear curve 46, which is preferably axially symmetrical with respect to the center of the central laminated core of the lower yoke 4.
  • FIG. 4 shows the offset of the center of gravity FP relative to the center of the laminated core M of the central laminated core of the lower yoke 4; it can be seen that the area center of gravity FP is in the direction of the winding support 12 (cf. Figure 1 ) adjacent yoke edge 42 is displaced.
  • the Figure 5 shows an embodiment of a three-legged magnetic core 1 for an electrical induction device which has three windings 10 in addition to the magnetic core 1. Each of the windings 10 is placed on one leg 2 of the three-legged magnetic core 1.
  • the Figure 5 also shows press bolts 94, which are used for pressing the laminated cores of the upper yoke 3 or the lower yoke 4.
  • the pressing bolts 94 preferably form components of pressing units, for example those such as the pressing units 91 and 92 according to FIG Figure 1 , of which at least one preferably does not cover the entire layer thickness of the respective yoke and of which at least another preferably comprises the entire layer thickness of the respective yoke.
  • segmentation of the respective yoke can be provided in a section 3a or 4a close to the leg and a section 3b or 4b remote from the leg, as indicated by lines L in FIG Figure 5 is indicated.
  • the Figure 6 shows the pressing of the laminated core at the upper yoke 3 of the magnetic core 1 according to Figure 5 exemplary in more detail.
  • a pressing device 9 can be seen, which comprises a pressing unit 91 and a pressing unit 92.
  • the press unit 91 has two opposing press beams 93, press bolts 94 and two press insert elements 95.
  • the function of the press insert elements 95 is to ensure a uniform contact pressure across laminated core stages.
  • the press unit 91 is used to compress all of the sheet packs of the yoke.
  • the press unit 92 also has two press beams 93, press bolts 94 and two press insert elements 95. In contrast to the pressing unit 91, the pressing unit 92 only compresses a subset of the laminated cores of the yoke.
  • the Figure 7 shows the two pressing devices 91 and 92 according to Figure 6 closer in detail in a three-dimensional view diagonally from the side.
  • the Figure 8 shows a preferred, modified embodiment for the pressing unit 91, which is directly adjacent to the winding 10.
  • the press bars 93 of the press unit 91 are each equipped with an electrical shield 96 in the region of their lower bar edges opposite the winding 10.
  • the electrical shield preferably has a round end face in cross section, the distance to the winding edge of which Winding 10 is equal to or smaller than the distance of the lower yoke edge 32 of the yoke 3 from the winding 10.
  • the press bars 93 and the electrical shield 96 are preferably made of metallic material.
  • the complete elimination of a step in the area of the lower yoke edge 32 facing the winding 10 already reduces the number of electrical peaks that occur (compared to conventional magnetic cores with circular yokes and a non-straight yoke edge).
  • the yoke edge 32 facing the winding 10 is shielded by the electrical shield 96 integrated in the pressing unit 91.
  • the pressing unit 91 is preferably extended downwards in such a way that a protrusion to the yoke edge 32 is formed, and the pressing unit 91 is preferably rounded in the region of this overlap.
  • the Figure 9 shows an embodiment of a three-legged magnetic core 1 for an induction device which is equipped with three windings 10. It can be seen that the three legs 2 of the magnetic core 1 are connected to one another by means of an upper yoke 3 and a lower yoke 4.
  • Tensioning bands 200 are provided for bracing the laminated cores of the upper yoke 3 and the lower yoke 4, which straps can be guided through holes or slots in the respective yoke.
  • a segmentation of the respective yoke can be provided in a section close to the leg and a section remote from the leg, so that each of the tensioning bands 200 braces either the segment remote from the leg or the segment close to the leg.
  • the segmentation into a segment distal to or away from the leg please refer to the explanations in connection with the Figure 5 referenced, which apply here analogously.
  • the Figure 10 shows in a cross section an embodiment for bracing the upper yoke 3 and the lower yoke 4 according to Figure 9 closer in detail.
  • the two press units 91 and 92 each have a clamping band 200, which is used to clamp the laminated cores of the respective yoke segment.
  • the two press units 91 and 92 preferably also have press insert elements 95, as already described in connection with the Figures 6 and 7 have been explained.
  • the laminated core of the yoke can be segmented into one or more segments remote from the leg and into one or more segments close to the legs; for example, in such a case the leg-near press unit 91 can press the leg-near segment of the yoke and the leg-remote press unit 92 can compress the leg-distal segment of the yoke.
  • the yoke can be provided with holes through which the tensioning straps 200 are pulled.
  • the tensioning straps (200) of the pressing unit (91) close to the leg and the tensioning straps of the pressing unit (92) remote from the leg are advantageously offset in the direction of the yoke axis. This makes it possible for the tensioning straps of the pressing unit close to the leg and the tensioning straps of the pressing unit remote from the leg to each use the same gap between the yoke segments.
  • the number of clamping bands (200) of the pressing unit (92) remote from the leg can be increased compared to the number of clamping bands of the pressing unit (91) close to the leg in order to achieve a favorable distribution of the pressing forces on the yoke.
  • the Figure 11 shows the two pressing devices 91 and 92 with the straps 200 according to Figure 10 the upper yoke 3 in a three-dimensional representation in more detail.
  • the Figure 12 shows an embodiment in which the laminated cores 31 of the yoke 3 do not at least partially have the same sheet width as the associated laminated cores of the leg 2.
  • the laminated cores of the leg are designed as in the examples already mentioned such that a leg approximates the circular shape 2 is formed. This is enclosed by the winding 10.
  • the yoke 3 has a reduced number of core stages compared to the leg.
  • a plurality of laminated cores 31 of the yoke have the same sheet width.
  • the cross-sections of the leg and yoke are adapted across the laminated core. This special design enables the core height to be reduced and the pressing units to be simplified.
  • the offset of the respective centers of the laminated cores 31 to one another also takes place here.
  • the laminated cores also form a straight yoke edge 32 on the cutting edge to the leg.
  • the pressing of the yoke is divided into several pressing areas, which are clamped by separate pressing units (91, 92).
  • the pressing devices 91 of the yoke 3 close to the legs are connected to one another by tension elements 98 running parallel to the leg axis for winding bracing.
  • these tension elements 98 can be formed by tension rods lying outside the winding, by tension rods resting on the leg within the winding or by tension elements made of plastic running inside the core or the winding.
  • the fastening elements 99 for lifting the active part are each connected only to the pressing unit 91 of a section of the yoke.
  • the press units 92 remote from the leg preferably have no connection to the winding bracing devices, the winding supports and the tension elements 98 for winding bracing and the fastening elements 99 for lifting the active part.
  • the force effects of these functions therefore need not be taken into account when dimensioning the pressing devices 92 remote from the leg.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Claims (14)

  1. Noyau (1) magnétique d'un dispositif d'induction électrique, qui a au moins deux branches (2) et au moins deux culasses (3, 4) reliant les branches (2) à leurs extrémités, les culasses (3, 4) et les branches (2) étant composées chacune de paquets (21, 31, 41) de tôles et la section transversale des branches (2) et celle des culasses (3, 4) étant déterminées par la largeur des paquets (31, 41) de tôles disposés les uns sur les autres et l'échelonnement qui s'ensuit, dans lequel
    - au moins l'une des branches (2) du noyau magnétique porte un enroulement (10) et cette branche (2), portant l'enroulement (10) est, en section transversale, de forme circulaire, en ayant un bord extérieur étagé et les milieux des paquets (21) de tôles de cette branche (2) sont sur une ligne droite et
    - pour au moins une culasse (3, 4), voisine de cette branche (2), les paquets (31, 41) de tôles sont orientés de manière à ce que les milieux de paquets (31, 41) de tôles se trouvant à l'extérieur soient, par rapport aux milieux de paquets (31, 41) de tôles se trouvant au milieu, décalés en direction de cette branche (2), en formant une surface de section transversale de culasse, dans laquelle le centre (FP) de gravité géométrique en surface est décalé par rapport aux milieux des paquets (31, 41) de tôles médians dans la direction de cette branche (2),
    caractérisé en ce que
    pour au moins l'une des culasses (3, 4), les paquets (31, 41) de tôles sont comprimés ensemble au moyen d'un dispositif de compression, qui a au moins deux unités (91, 92) de compression,
    - dont au moins une unité (91) de compression comprime ensemble tous les paquets (31, 41) de tôles de la culasse (3, 4) et
    - dont au moins une unité (92) de compression ne comprime ensemble qu'un ensemble partiel des paquets (31, 41) de tôles de la culasse (3, 4).
  2. Noyau (1) magnétique suivant la revendication 1,
    caractérisé en ce que
    les milieux des paquets (31, 41) de tôles extérieurs sont décalés dans la direction de la branche (2), de manière à ce que les milieux des paquets (3, 41) de tôles extérieurs soient plus serrés que les milieux de paquets (31, 41) de tôles médians.
  3. Noyau (1) magnétique suivant l'une des revendications précédentes,
    caractérisé en ce que
    les paquets (31, 41) de tôle d'au moins l'une des culasses (3, 4) sont orientés de manière à ce que, - considérés en section transversale et transversalement à la direction d'empilement des tôles - les milieux des paquets (3, 41) de tôles se trouvent sur une courbe incurvée, qui, rapportée aux milieux du paquet de tôles médian ou des paquets (31, 41) de tôles médians, est à symétrie axiale.
  4. Noyau (1) magnétique suivant l'une des revendications précédentes,
    caractérisé en ce que,
    pour au moins l'une des culasses (4), les paquets (41) de tôles forment, à l'interface avec la branche (2), un bord (42) rectiligne de culasse.
  5. Noyau (1) magnétique suivant l'une des revendications précédentes,
    caractérisé en ce que
    l'échelonnement dans la partie de la culasse (3, 4) correspond à deux fois l'échelonnement dans la partie de la branche (2).
  6. Noyau (1) magnétique suivant l'une des revendications précédentes,
    caractérisé en ce que
    la hauteur de chaque paquet de tôles de la culasse (3, 4) est exactement aussi grande que la hauteur du paquet de tôles opposé du côté du bord frontal de la culasse (2).
  7. Noyau (1) magnétique suivant l'une des revendications précédentes,
    caractérisé en ce qu'
    au moins l'une des unités (91, 92) de compression est formée par un collier (200) de serrage ou a un collier (200) de serrage.
  8. Noyau (1) magnétique suivant l'une des revendications précédentes,
    caractérisé en ce qu'
    au moins l'une des unités (91, 92) de compression a un boulon (94) de serrage, qui pousse sur la culasse (3, 4) deux éléments de serrage opposés l'un à l'autre et s'appliquant à la culasse (3, 4) du côté extérieur.
  9. Noyau (1) magnétique suivant l'une des revendications précédentes,
    caractérisé en ce que la compression de la culasse (3, 4) est, dans la direction de l'axe de la branche, subdivisée en plusieurs régions de compression et celles-ci, au moins en partie, ne comprennent pas toute l'épaisseur de couche de la culasse du noyau.
  10. Noyau (1) magnétique suivant l'une des revendications précédentes,
    caractérisé en ce que
    les unités (91, 92) de compression, comprimant chacune une région partielle de la hauteur de la culasse, sont pourvues de sommiers (93) de compression propres à chacune et répartissant la force de compression suivant la direction de la culasse.
  11. Noyau (1) magnétique suivant la revendication 10, caractérisé en ce que
    seuls les sommiers (93) de compression opposés à la branche (2) sont en liaison avec le support (12) de l'enroulement ou avec le dispositif (11) de serrage de l'enroulement.
  12. Noyau (1) magnétique suivant l'une des revendications précédentes,
    caractérisé en ce que
    - une unité (91, 92) de compression d'au moins une culasse (3, 4) est pourvue de sommiers (93) de compression disposés suivant la longueur de la culasse (3, 4) et
    - ces sommiers (93) de compression sont en un matériau métallique et sont pourvus, au moins en partie, du côté opposé à l'enroulement (10), d'une surface de fermeture circulaire formant un blindage (96) électrique, dont la distance au bord (112) de l'enroulement (10) est exactement aussi grande à la distance entre le bord (32) de la culasse et le bord (112) de l'enroulement ou est plus petite que cette distance.
  13. Noyau (1) magnétique suivant l'une des revendications précédentes,
    caractérisé en ce que
    - il est prévu, pour le serrage axial de l'enroulement (10) se trouvant sur la branche (2), au moins un élément (110, 111) d'appui, qui est incliné, au moins en partie, en direction de la culasse (3), et
    - le décalage des milieux des paquets (31) de tôles extérieurs de la culasse (3) sont conformés de manière à ce que l'échelonnement de la culasse (3) suive le contour de l'inclinaison de l'élément (110, 111) d'appui.
  14. Noyau (1) magnétique suivant l'une des revendications précédentes,
    caractérisé en ce que
    les paquets (41) de tôles de la culasse (4) se trouvant sous l'enroulement (10) sont décalés par rapport aux milieux du paquet de tôles médians de la culasse (4), de manière à ce que le bord (42) de la culasse forme, du côté tourné vers la branche (2), une ligne et le support (12) de l'enroulement pour le montage de l'enroulement (10) s'appuie directement, au moins en partie, sur ce bord (42) de la culasse.
EP14192071.0A 2014-11-06 2014-11-06 Noyau magnétique pour un dispositif d'induction électrique Active EP3018664B1 (fr)

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EP14192071.0A EP3018664B1 (fr) 2014-11-06 2014-11-06 Noyau magnétique pour un dispositif d'induction électrique

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EP3018664A1 EP3018664A1 (fr) 2016-05-11
EP3018664B1 true EP3018664B1 (fr) 2020-06-17

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DE102017223839A1 (de) * 2017-12-28 2019-07-04 Siemens Aktiengesellschaft Magnetkern mit Rückschlussschenkel
CN109346289B (zh) * 2018-11-09 2021-11-16 王永法 变压器叠铁心及其制备方法

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CH341896A (de) * 1955-12-30 1959-10-31 Oerlikon Maschf Geschachtelter Eisenkörper für Transformatoren
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JPS5230911U (fr) * 1975-08-27 1977-03-04
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