EP4182958A1 - Procédé de fabrication de boucles pour circuit magnétique - Google Patents
Procédé de fabrication de boucles pour circuit magnétiqueInfo
- Publication number
- EP4182958A1 EP4182958A1 EP21746528.5A EP21746528A EP4182958A1 EP 4182958 A1 EP4182958 A1 EP 4182958A1 EP 21746528 A EP21746528 A EP 21746528A EP 4182958 A1 EP4182958 A1 EP 4182958A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roll
- loops
- mandrel
- manufacturing
- sub
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000005520 cutting process Methods 0.000 claims abstract description 46
- 238000004804 winding Methods 0.000 claims description 21
- 230000007704 transition Effects 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 description 12
- 238000003754 machining Methods 0.000 description 9
- 238000007493 shaping process Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 3
- 238000007514 turning Methods 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009760 electrical discharge machining Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/10—Connecting leads to windings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0233—Manufacturing of magnetic circuits made from sheets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/12—Two-phase, three-phase or polyphase transformers
Definitions
- the invention relates to magnetic circuits for magnetic induction devices, such as three-phase power transformers, and more particularly relates to a process for manufacturing loops constituting such magnetic circuits.
- a power transformer comprises a magnetic circuit, commonly called a core, as well as blocks of coils placed around this magnetic circuit to provide inductive coupling.
- the magnetic circuit 2 of a three-phase transformer 1 can, in a known manner, be in the form of a three-dimensional prismatic cage, being formed from the association of three loops 3 which are juxtaposed two to two by extending relative to each other at an angle of 60°, triangularly.
- These loops 3 are of prismatic shape, namely each have a generally rectangular outline, and are shaped so as to each have an oblique junction surface 4 extending along an angle value of 30° with respect to the plane of extent of the corresponding loop.
- the loops 3 form two by two, at their junction, the columns 6 of the magnetic circuit 2 around each of which is placed a block of coils 7.
- the assembly of the blocks of coils results in splitting each loop 3 into two half-loops taking the form of the letter U and each comprising two cut faces, which are then globally reconstituted through the blocks of coils by keeping the cut faces face to face.
- Loops 3 are usually made by stacking layers of magnetic material.
- One of the methods adopted by manufacturers for obtaining such a stack of layers consists of winding a strip of magnetic strip around a mandrel of rectangular section.
- a first method known from the state of the art consists in adjusting, upstream of the winding around the mandrel to rectangular section, the width of the strip by means of laser cutting. Nevertheless, the use of this method reveals in practice the appearance of burrs, namely irregularly formed excesses of material, along the cutting edge, which are sources of short-circuiting and undesirable spaces between the layers once the winding done.
- An alternative method to the pre-cutting of the strip consists in winding around a mandrel with a rectangular section a strip of magnetic strip 8 of constant width, then proceed to a chamfering of edges, marked by H, by machining, spark erosion, or water jet cutting.
- This method makes it possible to overcome the surface defects noted in the case of laser cutting of the strip, but nevertheless always induces in the same way costly scraps of materials. This method, which is both loss-generating and time-consuming, therefore appears to be perfectible.
- the object of the invention is therefore to propose a solution for the manufacture of magnetic circuit loops making it possible to limit the waste of material and overall the production costs.
- the subject of the invention is a method for manufacturing magnetic circuit loops for a polyphase transformer from a magnetic strip, the method comprising at least the steps of: a) supplying a magnetic strip of constant width in the form of a cylindrical roller extending along a longitudinal axis; b) cutting of the roll to extract therefrom a first and a second half-roll of longitudinal axis each comprising a respective delimiting surface which is formed at the end of its separation with the other half-roll, the cutting being carried out obliquely with respect to the longitudinal axis so that the orientation of the boundary surfaces is opposite: the first half-roller comprises a boundary surface oriented outwardly with respect to its longitudinal axis, while the second half-roller includes a boundary surface oriented inwardly of its longitudinal axis; c) bringing the first and second half-rolls into conformity to form two loops, including at least one sub-step of unwinding and re-winding the second half-roll upside down on a mandrel.
- the invention also relates to a process for manufacturing loops thus defined, in which the bringing into conformity c) of the first and second half-rolls comprises a sub-step of straightening a crown appearing at the end of the step of unwinding and re-winding upside down of the second half-roll on the mandrel, this crown corresponding to the contour of the delimiting surface at the end of the sub-step of unwinding and re-winding upside down, so that the orientation of the boundary surface of the second half-roll after straightening corresponds to the orientation of the boundary surface of the first half-roll.
- the invention also relates to a process for manufacturing loops thus defined, comprising a sub-step of hollowing out the delimitation surface of the second half-roll before the sub-step of unwinding and re-winding upside down on the mandrel, this digging sub-step counteracting the appearance of a bulge corresponding to the contour of the boundary surface after re-rolling upside down, so that the orientation of the boundary surface of the second half-roll at the resulting from the unwinding and re-winding upside down on the mandrel corresponds to the contour of the delimitation surface of the first half-roll.
- the invention also relates to a process for manufacturing buckles thus defined, comprising an additional shape transition step d) after the step of bringing the first and second half-rolls into conformity, this shape transition step d) comprising an unwinding and rewinding at the location of the first half-roll and the second half-roll on another mandrel with a non-circular section.
- the invention also relates to a process for manufacturing buckles thus defined, in which the other mandrel is of generally rectangular section.
- the invention also relates to a process for manufacturing buckles thus defined, in which the mandrel has a non-circular section; and in which the step of bringing the first and second half-rolls into conformity comprises an additional sub-step of unwinding and rewinding at the location of the first half-roll on the mandrel.
- the invention also relates to a process for manufacturing buckles thus defined, in which the mandrel is of generally rectangular section.
- the invention also relates to a method for manufacturing a magnetic circuit for a polyphase transformer, comprising:
- the invention also relates to a power transformer, comprising a magnetic circuit having the shape of a three-dimensional cage, this magnetic circuit being formed of a plurality of loops arranged end-to-end along a closed contour, of which two of these loops are made in accordance with the buckle manufacturing process thus defined.
- FIG. 1 is a schematic perspective view of a three-phase transformer comprising a magnetic circuit and blocks of coils;
- FIG. 2 is a partial schematic perspective view of a magnetic circuit loop
- FIG. 3 illustrates a step in the manufacture of a roll by winding a strip of magnetic strip on a cylindrical mandrel, on the basis of which loops are manufactured;
- FIG. 4 illustrates a step of cutting the roller of FIG. 3
- FIG. 5 is a schematic view of a first and a second half-roll obtained at the end of the cutting step
- FIG. 6 illustrates a step of unwinding and rewinding at the location of the first half-roll on a mandrel with a rectangular section
- FIG. 7] and FIG. 8] illustrate a step of unwinding and rewinding the second half-roll upside down on a mandrel with a circular section
- FIG. 9 illustrates a straightening step for a crown
- FIG. 10A illustrates a step of hollowing out the second half-roll to counter the appearance of a bulge
- FIG. 10B illustrates a step simultaneously associating a cutting of the roll of FIG. 3 to form a first and a second half-roll, and a hollowing out of the second half-roll to counter the appearance of a crown
- FIG. 11 illustrates an illustrates a step of unwinding and rewinding the second half-roll upside down on a mandrel with a rectangular section after the digging step
- FIG. 12 is a flowchart of two possible methods of manufacturing buckles according to the invention
- FIG. 13 illustrates the relationship between chuck diameter and cutoff angle value.
- the method according to the invention is part of a desire to optimize the manufacture of the loops 3 of the magnetic circuit 2 of FIG. 1, from a strip of magnetic strip.
- the idea underlying the invention is based on the improved compatibility of a machining operation applied to a circular contour of a part with respect to an operation machining applied to a non-circular contour, such as the rectangular contour of loops 3.
- the process for manufacturing loops 3 begins with a step A of forming a roll with a cylindrical section/contour, marked with 11 in FIG. 3, by winding around a first mandrel 12, with circular section and longitudinal axis X, a strip of magnetic strip 13 having dimensions of constant thickness and width.
- the roller 11 is held on either side of its longitudinal ends by jaws with a concentric clamping function on a part holder of the parallel lathe, the assembly driven in rotation by a spindle, the longitudinal axis X of the roller corresponding to the axis of rotation of the spindle.
- This cutting step B consists, when roller 11 is rotated about its longitudinal axis X, in machining a groove of constant width from the peripheral contour of roller 11 to crossing it with a cutting tool, marked by 17 in FIG. 4.
- the cutting tool moves in a rectilinear manner along a driving direction Y extending at an angle Q with respect to this longitudinal axis X. After cutting, it follows the obtaining the first and second half-rollers 14, 16 of respective longitudinal axis X14, X16.
- the invention advantageously provides for driving the roller 11 in the direction of rotation which tends to tighten the spiral formed by the winding of the strip of magnetic strip 13, so as to overcome strip deformation during cutting. .
- each of the two half-rolls 14, 16 obtained comprises a respective delimiting surface, denoted 14a, 16a, which is formed by the cutting tool, as illustrated in FIG. 4.
- These surfaces delimitation 14a, 16a are frustoconical and extend at an equivalent angle relative to the overall plane of the corresponding half-roller 14, 16.
- the first half-roller 14 has a so-called “outer” or “outgoing” boundary surface 14a in that any vector V14 normal to this surface does not meet the longitudinal axis X14; while the delimiting surface 16a of the second half-roller 16, of opposite orientation, is called “inner” or “re-entrant” in that any vector V16 normal to this surface meets the longitudinal axis X16.
- the cutting step B is performed so that the longitudinal extents of the first half-roll 14 measured at its inner periphery and its outer periphery correspond respectively to the longitudinal extents of the second half-roll 16 at its periphery. exterior and its interior periphery.
- the cross section of the second half-roller 16 corresponds to the cross section of the first half-roller 14 reversed post-cutting.
- This cutting step B which is simple to perform and specifically adapted for machining parts with a circular outline, makes it possible to form frustoconical delimitation surfaces 14a, 16a each intended to become the oblique junction surfaces 4 of the loops 3 with a rectangular outline of figure 1. After the cutting step, it is a question of shaping the first and second half-rollers 14, 16 to conform to the architecture of the loops 3.
- the loops 3 each have an oblique junction surface 4 extending along an angle value of 30° with respect to the loop plane.
- the invention judiciously provides that:
- the first mandrel 12, used to form the roll 11 has a diameter corresponding to the length of the internal contour of the loops 3,
- the length of the strip of magnetic strip 13 used is adapted so that the roll 11 has a thickness equivalent to the loops 3 to be formed and, additionally,
- the first half-roller 14 has a section in cross section which corresponds to the section in section of a loop 3 as illustrated in FIG. 1, in particular with regard to its delimiting surface 14a, but has a circular outline, know that differs from the expected rectangular outline.
- the work on the first half-roll 14, to form a loop 3 consists of a single shape transition, passing from a circular outline to a rectangular outline.
- the step of the method associated with the manufacture of a first loop 3 for magnetic circuit from the first half-roll 14, consists in unrolling it to re-wind it around a second mandrel 15 of which:
- the circumference is equivalent to the diameter of the first circular mandrel 12 used to form the roll 11;
- both its cross-sectional section and its shape differ from those expected of a loop 3 as represented in FIG. 1.
- the invention provides a step of section transition so as to make the second half-roll 16 identical to the first half-roll 14 in its post-cutting state, this before performing a shape transition step to obtain a second loop 3.
- This section transition step is established in two successive sub-steps, denoted C2 and D2.
- the first sub-step C2 consists in unrolling the second half-roll 16 by simultaneously re-winding it upside down around a third mandrel 18 with a circular outline and of diameter equivalent to the first mandrel. 12 used to form the roll 11.
- this re-winding upside down leads to the layers of magnetic strip 13 being stacked upside down.
- the layer of strip delimiting the outer periphery of the second half-roll 16 at the end of the cutting step corresponds to the layer which delimits the inner periphery of this second half-roll in its state at the end of this first stage, marked 16'.
- this first sub-step C2 does not make it possible to find the section of the first half-roller 14, which the second sub-step D2 aims to correct.
- This second sub-step D2 consists of a straightening operation of the crown K, advantageously carried out with a parallel lathe and an envelope working tool 19 which moves linearly along an inclined plane at the angle Q with respect to the axis of the half-roller 16'. The removal of this crown K results in making the second half-roll, denoted 16" at this stage, substantially conform to the first half-roll 14.
- step C1 the next step of shaping the second half-roll corresponds to step C1 described to obtain a loop 3, namely consists of a shape transition by rewinding the place on the second mandrel 15 of generally rectangular section.
- This first embodiment provides for eliminating by machining the crown K which appears, due to the frustoconical character of the delimitation surface 16a, after re-winding upside down (sub-steps C2 and D2).
- the method aims to counter the appearance of the crown K by hollowing out the delimitation surface 16a of the second half-roll 16, so that re-winding upside down generates a surface with generator substantially rectilinear, and not curved.
- this second embodiment of the method differs from the first embodiment with respect to the shaping of the second half-roll 16.
- the shaping of the second half-roll 16 according to the second embodiment is ensured in two successive steps.
- the first step which consists in hollowing out the delimitation surface 16a to generate a counter-curvature, is advantageously carried out by straightening with a parallel lathe which introduces a rotation of the second half-roller 16 around its axis X16 and a tool for envelope work 20 which moves along a curve to machine.
- the second step F consists of unrolling the second half-roll, denoted 16"' at the end of the first step E, by simultaneously re-rolling it upside down around of the second mandrel 15 with a generally rectangular section as described previously.
- the trajectory of the tool 20 is controlled so that the counter-curvature surface resulting from its passage, denoted 16a'", counterbalances the difference in initial magnetic strip length 13 as described based on Figure 7.
- the second half-roll corresponds globally to a loop 3 as represented in FIG. junction surface which is scalloped, not smooth. This identified particularity results from the inversion of the cutting angle of the layers of magnetic strip 13 after rewinding upside down, leading to the appearance of streaks J.
- the cutting tool differs from the tool 20 used in the case of the cutting step B as illustrated, with regard to its head, i.e. that is to say from its active part to the cutting of the material.
- the head of the tool 20 used during step B is in the form of a bevel which extends continuously without forming any discontinuity in the extension of the rod which supports the head, forming a point at the end of 'tool.
- the head of the tool 21 is also in the form of a bevel extending in the extension of the rod to form a first point 21a at the end of the tool, but also projects transversely by forming a second point 21b at the junction.
- the tool 21 moves as a whole during step BE in a rectilinear manner along the direction of depression Y extending along the angle Q with respect to this longitudinal axis X. Furthermore, a variation in the orientation of the tool 21 is operated around the second tip 21b, forming a pivot point which moves only along the driving direction Y, so that :
- the boundary surface 14a of the first half-roller 14 is formed frustoconically by the passage of the second tip;
- the counter-curved surface 16a'' of the second half-roller 16'' is formed by the passage of the first point 21a which moves along a curve when the orientation of the tool 21 varies.
- the method according to the invention has been explained in the context of manufacturing a pair of prismatic loops 3 from two half-rolls 14 and 16 with cylindrical contours and reverse sections, which are extracted from a roll 11 magnetic strip 13 by cutting.
- the manufacture of a first loop is based on a single shape transition operation C1 which consists in unrolling and re-rolling one of the half-rolls 14 on a mandrel 15 at the right side. generally rectangular section, while the manufacture of the other loop can be carried out according to two protocols which:
- - require both a section transition and a shape transition applied to the other half-roll 16, involving for each of the protocols a step of unwinding and rewinding upside down C2, F, - are particularly distinguished on the way used to solve a problem of non-conformity of loop by appearance of a crown K: one of the protocols requires a step D2 of suppression by machining of the crown K once this appears at the end of the reverse rewinding C2, while the other requires, on the contrary, to anticipate and overcome the appearance of such a crown K by forming a hollow counter-curved surface in upstream of the reverse rewinding step F.
- the counter-curved surface can be established during a step E associated with bringing the first and second half-rolls into conformity after the cutting step B , or established at the same time as the cutting during a BE step.
- the invention judiciously provides for the machining step D2, E of the protocol under consideration to be carried out by turning before the shape modification of the half-roll 16 by rewinding on mandrel with generally rectangular section 15.
- the first, second and third mandrels 12, 15, 18 used have equal diameters of a value corresponding to the internal circumference of the loops 3,
- the length of the strip of magnetic strip 13 used is adapted so that the roll 11 has a thickness equivalent to the loops 3 to be formed and
- the angle Q has a value of 60°.
- the second mandrel 15 of substantially rectangular section, it is understood that as the last destination mandrel, on which the half-rolls are wound to adopt the shape of the loops 3, its perimeter must necessarily correspond to the internal circumference of loop. Nevertheless, the invention is not limited to compliance with the aforementioned diameter criterion with regard to the first and third mandrels 12 and 18, as well as the value of the cutting angle Q, on the basis of the existence of a geometric link diameter-angle Q explained generically below with reference to figure 13.
- control configuration which respects the aforementioned dimensioning criteria.
- This control configuration comprises a first mandrel M whose diameter corresponds to the internal circumference of a loop 3 of FIG. 1, and which carries a half-roll P resulting from cutting at an angle of 60°.
- this half-roll P becomes a loop as defined in FIG. 1.
- a first configuration differs from the control configuration, in that it has a mandrel Ml, of greater diameter than the control mandrel M, which carries a half-roll PI formed of a strip of length equivalent to that used in the control configuration ( considering the fall of material after cutting), to present a strip volume equivalent to the control half-roll P. It is possible to achieve the formation of a loop 3 according to FIG. 1 by application of the method, with an angle Cutting Q1 which is less than 60° and which is defined so as to respect the dimension J.
- a second configuration differs from the control configuration in that it has a mandrel M2, of diameter this time smaller than the control mandrel M, which carries a half-roll P2 formed of a strip of length equivalent to that used in the control configuration. . It is also possible to achieve the formation of a loop 3 according to FIG. 1 by applying the method according to the invention with a cutting angle Q2 which is greater than 60° and which is defined so as to respect the dimension J .
- the method according to the invention is not limited to the production of loops adopting the particular morphology of FIG. 1. Indeed, it is understood that the method according to the invention is not limited to the production of loops having junction surfaces extending at an angle of 30° relative to the loop plane, by defining the angle Q just as needed.
- any type of shape of loops 3 can be envisaged in practice without departing from the scope of the invention.
- the invention provides for the possibility of enriching the method by additional machining operations which are advantageously carried out in turning, for example by turning and facing, such as to delimit, for example, corner surfaces marked 14b, 16b in the example of Figures 4 and 5, also visible in Figure 1 but not referenced.
- the corner surface denoted 14b can be dressed easily in step B.
- the corner surface denoted 16b can be dressed easily in step D2, but also more difficult to dress in step B or E, with a counter-bombed. This counter-bulge is not essential in the case of the formation of the corner surface denoted 14b, because it is less pronounced and external in the assembly of the magnetic circuit 1 of figure 1.
- the invention has been described in the case where the roll 11, made from the strip of magnetic strip 13, is split into two half-rolls 14, 16 of the same volume.
- the width and the length of the strip of magnetic strip 13 used to form the roll 11 are defined with regard to the dimensions of the loops to be manufactured.
- a three-phase transformer comprises three loops, it can be envisaged to dimension the roller 11 so as to be able to judiciously extract from it several pairs each formed of a first and second half-rolls complementary 14, 16.
- the application of the method according to the invention makes it possible to limit the manufacturing costs when it is desired to manufacture at least two loops.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2007578A FR3112648B1 (fr) | 2020-07-20 | 2020-07-20 | Procédé de fabrication de boucles pour circuit magnétique |
PCT/FR2021/051262 WO2022018344A1 (fr) | 2020-07-20 | 2021-07-08 | Procédé de fabrication de boucles pour circuit magnétique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP4182958A1 true EP4182958A1 (fr) | 2023-05-24 |
EP4182958B1 EP4182958B1 (fr) | 2024-03-06 |
Family
ID=72885748
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21746528.5A Active EP4182958B1 (fr) | 2020-07-20 | 2021-07-08 | Procédé de fabrication de boucles pour circuit magnétique |
Country Status (5)
Country | Link |
---|---|
US (1) | US20230282416A1 (fr) |
EP (1) | EP4182958B1 (fr) |
CN (1) | CN116137925A (fr) |
FR (1) | FR3112648B1 (fr) |
WO (1) | WO2022018344A1 (fr) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NZ191840A (en) * | 1978-10-19 | 1983-06-14 | L Manderson | Transformer core construction |
ES2406808T3 (es) * | 2010-06-08 | 2013-06-10 | Abb Technology Ag | Método para la fabricación de núcleos de transformador triangular fabricados de metal amorfo |
IL217576A0 (en) * | 2012-01-17 | 2012-03-29 | Eliezer Adar | Three phase transformer and method for manufacturing same |
US8729998B2 (en) * | 2012-06-06 | 2014-05-20 | Abb Technology | Three-step core for a non-linear transformer |
-
2020
- 2020-07-20 FR FR2007578A patent/FR3112648B1/fr active Active
-
2021
- 2021-07-08 EP EP21746528.5A patent/EP4182958B1/fr active Active
- 2021-07-08 WO PCT/FR2021/051262 patent/WO2022018344A1/fr unknown
- 2021-07-08 US US18/005,680 patent/US20230282416A1/en active Pending
- 2021-07-08 CN CN202180060710.1A patent/CN116137925A/zh active Pending
Also Published As
Publication number | Publication date |
---|---|
FR3112648A1 (fr) | 2022-01-21 |
CN116137925A (zh) | 2023-05-19 |
WO2022018344A1 (fr) | 2022-01-27 |
EP4182958B1 (fr) | 2024-03-06 |
FR3112648B1 (fr) | 2023-04-14 |
US20230282416A1 (en) | 2023-09-07 |
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