EP0367942A1 - Noyaux magnétiques en tôle, parties de noyaux magnétiques, et tôles compactes, et leur procédé de fabrication - Google Patents

Noyaux magnétiques en tôle, parties de noyaux magnétiques, et tôles compactes, et leur procédé de fabrication Download PDF

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Publication number
EP0367942A1
EP0367942A1 EP89116767A EP89116767A EP0367942A1 EP 0367942 A1 EP0367942 A1 EP 0367942A1 EP 89116767 A EP89116767 A EP 89116767A EP 89116767 A EP89116767 A EP 89116767A EP 0367942 A1 EP0367942 A1 EP 0367942A1
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EP
European Patent Office
Prior art keywords
stack
shaped
tapes
magnetic
compact
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.)
Withdrawn
Application number
EP89116767A
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German (de)
English (en)
Inventor
Jens Dipl.-Ing. Hoppe
Rolf Prof.-Dr.-Ing. Tzscheutschler
Günter Pat.-Ing. Hoppe
Hilmar Dr.-Ing. Stephani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Transformatoren und Roentgenwerk GmbH
Original Assignee
Transformatoren und Roentgenwerk GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DD32155388A external-priority patent/DD276755A1/de
Priority claimed from DD32726689A external-priority patent/DD281286A5/de
Priority claimed from DD32726589A external-priority patent/DD281285A5/de
Priority claimed from DD32957489A external-priority patent/DD284994A5/de
Application filed by Transformatoren und Roentgenwerk GmbH filed Critical Transformatoren und Roentgenwerk GmbH
Publication of EP0367942A1 publication Critical patent/EP0367942A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)

Definitions

  • the invention relates to a method for producing laminated magnetic cores or laminated magnetic core parts or compact sheets for electrical induction apparatus, which are made from the thinnest strips, eg. B. made of amorphous magnetic material.
  • an I-shaped stack of tapes is produced by simultaneously and jointly folding meandering or zigzag-shaped tapes arranged one above the other or parallel to one another.
  • Magnetic cores of this type are preferably required for electrical transformers, transformers and converters; such magnetic core parts or compact sheets are suitable for the production of complete magnetic cores.
  • the invention further relates to a method for producing Mixing cores made of amorphous or at least partially amorphous magnetic material, where the magnetic material of one and the same magnetic core, magnetic core part or compact sheet made of strips of different properties, e.g. B. composed of permeability, saturation induction, magnetostriction or ductility, or different alloy.
  • B. composed of permeability, saturation induction, magnetostriction or ductility, or different alloy.
  • the invention further relates to laminated magnetic core parts or laminated compact sheets of I-shape, which consist of thin strips. These thin strips are layered on top of one another and connected to one another at the ends of the magnetic core part or compact sheet, since the layers are likewise produced by folding from a quasi-endless strip, and corresponding mixing cores made of amorphous or at least partially amorphous magnetic material.
  • I-shaped band stacks are understood to mean band stacks which have the shape of an elongated rectangle in plan view.
  • Amorphous magnetic material is available in thin strips of limited width but practically unlimited length due to the technological processes used in its manufacture. This means that cutting and layering (nesting) of individual foils in accordance with the shape is ruled out in the manufacture of magnetic cores for practical reasons.
  • the amorphous magnetic tapes obtained in thicknesses of approximately 0.025 mm to 0.050 mm were therefore predominantly wound up and used in the form of winding tape cores. It is also known to cut open these winding tape cores and to process them further as cutting tape cores.
  • These laminates are for use in power transformers, e.g. B. in distribution transformers, suitable (Fish, E .: Recent Developments In Low Core Loss Materials For Power Transformers. Canadian Electrical Association Power Transformer Subsection. Montreal: Quebec 25.03.85). Furthermore, it was already considered to produce compact sheets by laminating the thinnest foils by first wrapping foils into winding tape cores and then pressing them to form flat sheet stacks (DD-A-317 165 4). These sheet stacks have an I-shaped shape and are suitable at a low height as magnetic core parts or compact sheets for layering complete magnetic cores. At a corresponding height, flat film stacks produced in this way can be used as I-shaped magnetic cores.
  • the longitudinal ends of the film stack have a convex shape.
  • To manufacture magnetic cores or magnetic core parts it is also known to fold magnetic tapes. It is known to fold the yokes of power transformers, which are designed as a temple type of one or more amorphous ribbons provided (EP-A1-151048). Furthermore, it is known to produce magnetic cores with an annular cross section and a height that corresponds to the bandwidth by folding the sheets with an initially increasing fold length and, after reaching the core diameter, with a decreasing fold length (DD-A-73 587). This method can only be used to a very limited extent in the bandwidths in which amorphous material is currently available; in addition, there is no closed magnetic circuit.
  • Folded sheets made of thin but not amorphous magnetic materials for the production of U-shaped cores after correct cutting are also known (DE-A1-31 37 391).
  • rectangular sheet metal parts are punched out of an endless band and the remaining band is then folded in a zigzag fashion. This method is not waste-free and has the disadvantage that a punch cut is required per sheet.
  • the method according to the invention in which thin tapes, in particular made of amorphous magnetic material, are first processed to form I-shaped tape stacks by meandering or zigzag folding, is characterized in that after simultaneous and joint folding of several tapes provided in parallel, a part belonging to one or more tapes of the I-shaped tape stack is pulled out and then the pulled-out partial tape stack is pivoted to the longitudinal axis of the remaining tape stack, preferably by 90 °.
  • an even number of tapes can be folded together and simultaneously. Then the half of the I-shaped band stack associated with one or more bands is pulled out and pivoted through 90 degrees, so that an L-shaped magnetic core, an L-shaped magnetic core part or an L-shaped compact sheet is produced.
  • a number of bands that can be divided by three is folded together and simultaneously. Then a two-thirds of these tapes corresponding partial tape stack is pulled out of the I-shaped tape stack and pivoted with its longitudinal axis to the longitudinal axis of the remaining tape stack, preferably by 90 °. Then the half of the swiveled belt stack belonging to one or more belts is again partially pulled out and swiveled again by 90 degrees, so that a U-shaped part of the same strength is produced in the same direction of rotation as in the previous swiveling process.
  • closed magnetic cores, magnetic core parts and closed compact sheets can be produced by processing a number of strips that can be divided by four together in the manner specified above.
  • a further improvement of the method according to the invention consists in alternately folding the strips introduced in parallel with different lengths and the difference in the folding lengths being equal or approximately equal the width or double the width of the tapes. This creates magnetic cores, magnetic core parts or compact sheets that are just as strong in their corner areas as in their leg areas.
  • each band or the bands of one or more groups of bands which are in particular removed from supply rolls, consist of amorphous magnetic material with at least one different property.
  • the amorphous magnetic materials on the individual rolls can differ from one another in terms of permeability, saturation induction, magnetostriction and / or ductility.
  • the proposal to make the fold length within a band stack of different lengths also feasible so that first several folds of one length and then an identical or approximately the same number of folds of a different length are carried out.
  • the result is an I-shaped, laminated magnetic core part or a laminated compact sheet, the thickness of which is reduced at one or both ends to half or approximately half the total thickness, the range of reduced thickness roughly corresponding to the bandwidth.
  • FIG. 1 4 storage rolls 1, 2, 3, 4 with tapes made of amorphous magnetic material are shown in the arrangement for producing an I-shaped tape stack.
  • the magnetic material used here consists of Fe 80 B 14 Si6 and has the property that it does not break when folded.
  • the magnetic material has a band width of 20 mm and a band thickness of 0.025 mm.
  • the belts are brought together via guide rollers 5, 6, 7, 8 via drive means, not shown. These guide rollers can also be used to apply substrates, for coating and. Like. Be used.
  • the guide rollers 5 and 6 which guide the tapes from the supply rolls 1 and 2, as an adhesive device that dabs one of the tapes at certain intervals with an adhesive, which is advantageous according to the invention, since these two tapes are not mutually exclusive should postpone.
  • the same device has the guide roller 8, which ensures that the tapes of the supply rollers 3 and 4 are not mutually displaceable.
  • the guide roller 7 brings on the tape from the supply roller 3 a lubricity-increasing, well-wetting liquid, for. B. silicone oil.
  • the laminate thus produced is fed to a folding device 11 via the transport rolls 9 and 10, which bring about the union of the two pairs of tapes, and then as I. -shaped folded band stack 12 of meander-shaped foils deposited.
  • the arrangement described in Fig. 1 can be modified in many ways. For example, it will be expedient to connect combinations of more than two belts to one another by stacking such rolls, because it is advantageous in processing if a smaller number of folds is required for the same belt stack height and the partial stacks to be moved are inherently more stable.
  • the arrangement shown in FIG. 1 is only suitable for producing L-shaped magnetic core parts or compact sheets. For the production of U-shaped magnetic core parts, compact sheets or closed magnetic circuits, however, the arrangement of a number of bands or band combinations divisible by three or by four would be necessary.
  • FIG. 2 shows the stack of tapes, as is obtained in an arrangement according to FIG. 1, in a perspective view, not to scale.
  • the partial tape stack 13 corresponding to a pair of tapes which comes from the supply rolls 3 and 4 is now displaced in relation to the tape stack 14 by the supply rolls 1 and 2 in the longitudinal direction of the tape stack, which leads to an arrangement according to FIG. 3.
  • the pairs of bands of the band stacks 13 and 14 are treated and drawn as a uniform sheet.
  • the subband stack 13 of one pair of belts as shown in FIG. 3, is pulled out, as shown in FIG. 4, is pivoted 90 degrees to the longitudinal axis of the partial stack from the band stack 14 of the other pair of belts, the band stacks being arranged flush in the corner region.
  • This process step now leads to an L-shaped magnetic core part, as shown in FIG. 5.
  • FIG. 6 shows an arrangement for producing an I-shaped stack of tapes.
  • the same components or assemblies in FIG. 6 have the same reference numerals as in FIG. 1.
  • “B” denotes the bandwidth of the strips of amorphous magnetic material that are wound on the supply rolls 1, 2, 3, 4.
  • the folding device 15 here causes the strips to be folded in such a way that a smaller fold length L2 follows alternately after a larger fold length L1.
  • the difference between large fold length L1 and small fold length L2 is chosen to be equal to or approximately equal to the width B of the strips.
  • the shortening of the folding length L2 compared to the folding length L1 always takes place on the same side, so that after the folded tapes are deposited in a tape stack 16, one end of the tape stack 16 is arranged flush, while at the other end of the tape stack 16 they alternate by one Bandwidth are offset.
  • Fig. 7 the case is shown that the folding device 15 performs the common and simultaneous folding so that the large fold length L3 is followed by a smaller fold length L4, which differs from the large fold length L3 by twice the width B.
  • the folding and storage takes place in such a way that the tapes with the smaller folding length L4 on both sides of a tape stack 17 are alternately and evenly set back compared to the tapes with the large folding length L3.
  • FIG. 8 shows a perspective view of the tape stack 17, which is available in an arrangement according to FIG. 6.
  • Half of the tape stack has already been pulled out of the original tape stack in the longitudinal direction L and is now in the pivoting phase. This process of pivoting is carried out until a right angle is reached between the partial tape stacks and then results in a magnetic core part or a compact sheet whose overlapping ends of the partial stacks are not positively connected to one another.
  • FIGS. 9 and 10 differ from FIG. 8 in that the ends of the partial tape stacks in FIGS. 9 and 10 are connected to one another in a form-fitting manner. This is achieved by moving the pulled-out and swiveled tape stack again in its new longitudinal direction.
  • FIG. 10 shows how an L-shaped compact sheet can be obtained from the strip stack 16. This part in turn has the same stacking height in the corner area that was created by pivoting as in the adjacent leg areas.
  • the difference to FIG. 9 here is that in the end regions of the legs that correspond to the bandwidth B, the cross section of the leg end is half the cross section of the Thighs reduced.
  • the end of this compact sheet is shown undeformed and requires a second, identical L-shaped part to produce a magnetic core part or a magnetic core.
  • L-shaped magnetic core parts or compact sheets according to FIG. 10 are used, a square magnetic core with a core window of a corresponding shape is formed after the parts have been joined, while when using the I-shaped magnetic core part or L-shaped compact sheet Fig. 9 is a rectangular magnetic core, the difference in the sides of the magnetic core amounts to a bandwidth.
  • FIG. 11 A further embodiment variant on the basis of folded thin strips of amorphous material with different folding lengths is shown in FIG. 11.
  • a compact sheet called I-shaped is shown, which consists of two partial stacks 18 and 19, which form a structural unit.
  • I-shaped sheets are understood to be those which have the shape of an elongated rectangle in plan view.
  • the compact sheet consists of thin magnetic tapes made of amorphous magnetic material.
  • the magnetic material again consists of an alloy FE 80B14516 and has ductile properties. It has a band width of 20 mm and a band thickness of approx. 0.025 mm.
  • a folding device as z.
  • the amorphous strips are stacked in layers so that the ends of the compact sheet are connected.
  • the compact sheet formed from two partial stacks 18 and 19 is characterized by a difference in length of the partial stacks, which is a bandwidth at each end of the strip stack. This results in a reduction in its thickness at the ends of the compact sheet.
  • FIGS. 12a-12d show schematic representations of differently shaped I-shaped compact sheets.
  • the reduced thicknesses that have arisen at the end or the ends of the compact sheets and / or the region of the reduced thickness in the longitudinal direction are different.
  • FIG. 12a shows a compact sheet made according to the invention, which has a thickness reduced by half at one end of the part, the area of reduced thickness in the longitudinal direction of the part corresponding to a strip width.
  • FIG. 12b shows a compact sheet according to FIG. 12a, which has a thickness reduced by half at the other end of the part, the area of reduced thickness in the longitudinal direction of the sheet being half a bandwidth.
  • the use of such compact sheets is advantageous in three-leg cores.
  • 12c shows a compact sheet which has a thickness reduced by two thirds at one end, the part projecting by a bandwidth in the longitudinal direction of the part being arranged in the center.
  • FIG. 12d shows a compact sheet in which the arrangement shown in FIG. 12c, described above, was implemented at both ends of the compact sheet.
  • These compact sheets realized according to FIGS. 12c and 12d can be laid in combination with the compact sheet described in FIG. 12a to form L-shaped, U-shaped and closed cores. It is also possible to vary the length of the compact sheets described above, so that there are variations in the rectangular shape of the core fen sters are possible.
  • a magnetic core part is understood to be a laminated part made of magnetic material, which differs from compact sheets by its greater stack height, the complete magnetic core being produced from a few magnetic core parts.
  • a compact sheet is understood to be a laminated part made of magnetic material, which is characterized by a stack height of approximately 0.3 to 1.5 mm and which leads to magnetic cores, as is the case when using conventional magnetic sheets and with an arrangement of two to three sheets arise per fold.
  • Mixing cores are laminated magnetic cores in which magnetic sheets or magnetic tapes with different magnetic or other properties are used.
  • An exemplary embodiment is described with reference to FIGS. 13 to 15.
  • FIG. 13 shows an arrangement which is used to produce a folded stack of strips from amorphous strips and which largely corresponds to the arrangements of FIGS. 1 and 6. It also has supply rolls 1, 2, 3, 4, the thin magnetic tapes, for. B. 0.03 mm thick. These tapes are removed from the supply rolls 1, 2, 3, 4 and brought into a parallel position with one another via guide rolls 5, 6, 7, 8. Certain leadership roles can in turn be used at the same time are to provide the tapes continuously or in spots or lines with adhesive, e.g. B. when the strips are processed into compact sheets or magnetic core parts according to FIG. 15. By means of transport rollers 9 and 10, the tapes from the four supply rollers 1-4 are combined and inserted into a folding device 11.
  • This folding device folds the combined band combination at the same time and with a defined length to form a band stack 20. It is also possible to alternate the fold length as shown in FIG. 6 or to change the fold length after a certain number of folds, which then results in a band stack 15 leads.
  • the loading of the supply rolls 1-4 is carried out in such a way that there is a mixture of properties of the tape stack or of the parts formed therefrom.
  • the rollers 1 and 2 are equipped with magnetic material with the same properties - designated in Fig. 13 with ⁇ 1 - while the rollers 3 and 4 have a magnetic material with different properties - ⁇ 2 -, and the guide rollers 5, 6 and 8 also work simultaneously in terms of application of an adhesive layer, while the guide roller 7 applies an adhesion-reducing agent, a tape stack is formed which can be processed as shown in FIG. 12. By pulling out a half of the entire tape stack corresponding sub-tape stack (see. Fig.
  • the supply rolls 1 and 2 as well as 3 and 4 are each equipped with magnetic material with different properties or even each supply roll has a magnetic material with different properties and apply all guide rolls 5, 6, 7 and 8, a compact sheet according to FIG. 15 is produced a resulting permeability if the individual bands differ in this regard.
  • the number of supply rolls used and the number of supply rolls combined in groups can be changed as desired, which increases the possible combinations for the composition of mixing cores.
  • the tapes from 3 supply rolls can be combined into a group, the ductile properties which are favorable for the outer tapes, while the tape enclosed by these tapes is distinguished in a different way.
  • the combination of sheets with favorable magnetostrictive properties and those with a favorable course of the magnetization curve is also possible. It is also possible to use partially crystalline or even completely crystalline tapes in combination with amorphous tapes.
  • the advantage here is the increased saturation induction of the mixing core compared to amorphous cores with reduced specific magnetic loss compared to pure crystalline cores.
  • For the mixture of magnetic materials there are different alloys as well as different properties regarding permeability behavior, saturation behavior, magnetostriction or different ductility. It is part of the subject matter of the present invention to combine the different components with one another in different ways.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
EP89116767A 1988-11-08 1989-09-11 Noyaux magnétiques en tôle, parties de noyaux magnétiques, et tôles compactes, et leur procédé de fabrication Withdrawn EP0367942A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
DD321553 1988-11-08
DD32155388A DD276755A1 (de) 1988-11-08 1988-11-08 Verfahren zur herstellung eines lamellierten magnetkernes bzw. von magnetkernteilen
DD32726689A DD281286A5 (de) 1989-04-05 1989-04-05 Verfahren zur herstellung eines lamellierten magnetkernes oder von lamellierten magnetkernteilen bzw. von lamellierten kompaktblechen von l-, u- oder quadratischer form
DD32726589A DD281285A5 (de) 1989-04-05 1989-04-05 Lamelliertes magnetkernteil bzw. lamelliertes kompaktblech i-foermiger gestalt sowie verfahren zur herstellung solcher magnetkernteile bzw. kompaktbleche
DD327266 1989-04-05
DD327265 1989-04-05
DD32957489A DD284994A5 (de) 1989-06-14 1989-06-14 Verfahren zur herstellung von mischkernen
DD329574 1989-06-14

Publications (1)

Publication Number Publication Date
EP0367942A1 true EP0367942A1 (fr) 1990-05-16

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EP89116767A Withdrawn EP0367942A1 (fr) 1988-11-08 1989-09-11 Noyaux magnétiques en tôle, parties de noyaux magnétiques, et tôles compactes, et leur procédé de fabrication

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998052052A2 (fr) * 1997-05-13 1998-11-19 Vacuumschmelze Gmbh Noyau magnetique
CN102110521B (zh) * 2009-12-25 2013-01-23 上海宝钢设备检修有限公司 变压器叠片式铁芯的斜接缝方法
CN113707443A (zh) * 2021-08-23 2021-11-26 横店集团东磁股份有限公司 一种纳米晶磁芯的制备方法及纳米晶磁芯

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1431238A (fr) * 1965-03-13 1966-03-11 Sciaky Sa Transformateur, en particulier pour machines à souder par résistance, procédé etdispositif pour sa fabrication
DE3137391A1 (de) * 1981-09-19 1983-04-07 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur herstellung geblechter kerne
EP0151048A1 (fr) * 1984-02-02 1985-08-07 Hawker Siddeley Power Transformers Limited Appareils électriques d'induction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1431238A (fr) * 1965-03-13 1966-03-11 Sciaky Sa Transformateur, en particulier pour machines à souder par résistance, procédé etdispositif pour sa fabrication
DE3137391A1 (de) * 1981-09-19 1983-04-07 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur herstellung geblechter kerne
EP0151048A1 (fr) * 1984-02-02 1985-08-07 Hawker Siddeley Power Transformers Limited Appareils électriques d'induction

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 20 (E-376)(2077) 25 Januar 1986, & JP-A-60 182120 (TOSHIBA K.K.) *
SOVIET INVENTIONS ILLUSTRATED DERWENT Woche 86/20,30.Mai 1986,LONDON & SU-A-1185-408 (MOSCELEKTROZAVOD) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998052052A2 (fr) * 1997-05-13 1998-11-19 Vacuumschmelze Gmbh Noyau magnetique
WO1998052052A3 (fr) * 1997-05-13 1999-05-14 Vacuumschmelze Gmbh Noyau magnetique
CN102110521B (zh) * 2009-12-25 2013-01-23 上海宝钢设备检修有限公司 变压器叠片式铁芯的斜接缝方法
CN113707443A (zh) * 2021-08-23 2021-11-26 横店集团东磁股份有限公司 一种纳米晶磁芯的制备方法及纳米晶磁芯
CN113707443B (zh) * 2021-08-23 2023-03-31 横店集团东磁股份有限公司 一种纳米晶磁芯的制备方法及纳米晶磁芯

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