EP4466724A1 - Noyau de bobine de suppression, inductance de suppression comprenant un tel noyau de bobine de suppression et procédé de formation d'un noyau de bobine de suppression - Google Patents

Noyau de bobine de suppression, inductance de suppression comprenant un tel noyau de bobine de suppression et procédé de formation d'un noyau de bobine de suppression

Info

Publication number
EP4466724A1
EP4466724A1 EP23701865.0A EP23701865A EP4466724A1 EP 4466724 A1 EP4466724 A1 EP 4466724A1 EP 23701865 A EP23701865 A EP 23701865A EP 4466724 A1 EP4466724 A1 EP 4466724A1
Authority
EP
European Patent Office
Prior art keywords
hollow
core elements
cylindrical core
core
ferrite
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.)
Pending
Application number
EP23701865.0A
Other languages
German (de)
English (en)
Inventor
Jens Schültzke
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.)
Sumida Components and Modules GmbH
Original Assignee
Sumida Components and Modules 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
Application filed by Sumida Components and Modules GmbH filed Critical Sumida Components and Modules GmbH
Publication of EP4466724A1 publication Critical patent/EP4466724A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type
    • H01F17/04—Fixed inductances of the signal type with magnetic core
    • H01F17/06—Fixed inductances of the signal type with magnetic core with core substantially closed in itself, e.g. toroid
    • 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
    • H01F27/255—Magnetic cores made from particles
    • 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
    • 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
    • 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

Definitions

  • Suppression choke core suppression choke with such a suppression choke core and method for forming a suppression choke core
  • the present invention is directed to a suppression choke core, a suppression choke having such a suppression choke core, and a method of forming a suppression choke core.
  • Chokes are generally used as coils or inductances in electrical engineering to limit currents in electrical lines, to temporarily store energy in the form of a magnetic field, to adjust an impedance of a circuit to the desired extent, or they are provided as filters.
  • chokes are usually connected in series with other components or consumers.
  • the magnetic core of chokes is made of a soft magnetic material. This increases the inductive resistance of the choke and enables the sizes of chokes to be reduced.
  • Soft magnetic materials are usually understood to be materials that can be easily magnetized in a magnetic field, such as ceramic materials in the form of ferrite based on a metal oxide, such as manganese-zinc ferrites or nickel-zinc ferrites.
  • a suppression choke is a type of choke that is used to reduce high-frequency interference signals through a high inductive resistance of the chokes, while direct current and low-frequency currents are little or not affected.
  • an interference suppression choke is formed by a toroidal core that is pushed onto a cable or provided by a so-called snap ferrite.
  • high-frequency coils for interference suppression in the form of perforated, cylindrical or flat ferrite cores, which can be split as snap ferrites. These ferrite cores are plugged or threaded onto the current-carrying conductor, or the current-carrying conductor is wrapped around the ferrite core.
  • cores that are plugged onto a busbar or chokes with multiple windings are also known.
  • the broadband is limited by eddy currents. Even if you try to reduce eddy current losses of a solid core by measures in which a possible If the ratio of a ferrite core area through which flow is small to the circumference is provided, the broadband capability is also limited in such a case.
  • this represents an approach in which, instead of a solid ferrite tube core, a ferrite tube core designed as a layered core is formed from a plurality of tube core sections, which are lined up one behind the other along a longitudinal direction of the ferrite tube core (corresponds to a direction perpendicular to the azimuthal and radial directions given in cylindrical coordinates of the ferrite tube core).
  • a longitudinal direction of the ferrite tube core corresponds to a direction perpendicular to the azimuthal and radial directions given in cylindrical coordinates of the ferrite tube core.
  • a suppression choke according to independent claim 1 a suppression choke according to independent claim 7 and a method according to independent claim 9.
  • Advantageous configurations of the suppression choke core are defined in dependent claims 2 to 6, while an advantageous configuration of the suppression choke according to independent claim 7 is defined in dependent claim 8 and advantageous configurations of the method according to independent claim 9 are defined in dependent claims 10 to 15 are defined.
  • the interference suppression choke core comprises at least two hollow-cylindrical core elements, one of the hollow-cylindrical core elements being successively arranged at least partially in another of the hollow-cylindrical core elements and the hollow-cylindrical core elements being permanently connected to one another, so that a ferrite tube core is formed.
  • the tubular ferrite core can be formed from a highly permeable material, for example the hollow-cylindrical core elements can have a magnetic permeability p of at least 2000, for example the relative permeability can be r >2000.
  • This provides a ferrite tube core that has an advantageous broadband and can be produced in a simple manner.
  • This ferrite tube core can provide a filter with advantageous filter effect and impedance over a wide frequency range, with eddy currents being advantageously suppressed.
  • one of the hollow cylindrical core elements may be totally enclosed within the other.
  • hollow-cylindrical core elements provided as hollow cylinders these can be successively arranged concentrically to one another.
  • the ferrite tube core can have exactly two hollow cylindrical core elements.
  • the interference suppression choke core according to the first aspect provides the possibility of interference suppression by providing the largest possible broadband reactance for an inductance with this tubular ferrite core.
  • the inventors recognized that eddy current losses in the ferrite core can be limited without limiting the broadband nature of an inductance with this tubular ferrite core.
  • the ratio of the ferrite core area to the circumference should be as small as possible for small losses.
  • a small-area rectangle with a large aspect ratio would be advantageous over a circular area. This is achieved by dividing the ferrite cores and inserting them into one another like sleeves, creating an onion structure.
  • the cores for a tubular ferrite core, which are plugged into one another to form an onion structure can be sintered together according to the first aspect, so that a high-impedance form-fitting connection is produced.
  • the suppression choke core according to the first aspect has the advantage that a desired broadband capability can be achieved even with a low degree of subdivision of the core, which enables a relatively simple manufacturing process, since, for example, compared to a known core with a layer structure, additional processing steps, such as additional grinding and gluing steps after sintering of core layers, can be dispensed with. This reduces manufacturing costs of ferrite tube cores according to the first aspect.
  • the at least two hollow-cylindrical core elements can be sintered and/or glued to one another.
  • a separating layer between the core elements is formed according to a dispersion area and/or an adhesive joint between the core elements. This separating layer or joint provides a magnetic reluctance between the core elements which leads to an improvement in broadband performance.
  • the core elements may be formed from the same material. This provides the advantage that the ferrite tube core has magnetic properties with close tolerances since the hollow cylindrical core elements are formed under close tolerances. This is due to the fact that with regard to shrinkage of the core elements during production of the core elements with the same materials, the core elements have a similar shrinkage and this can therefore be ignored.
  • the core elements can be formed from different materials, so that the magnetic properties of the ferrite tube core can be matched by the core elements with different materials.
  • the ferrite tube core may be configured to have an impedance greater than or equal to 580 ⁇ /m, preferably greater than or equal to 600 ⁇ /m, and more preferably greater than or equal to 700 ⁇ /m in the range of 10 kHz to 100 MHz.
  • a specific impedance can thus be achieved over a wide frequency range with a small number of hollow-cylindrical core elements, for example with a ferrite tube core with exactly two hollow-cylindrical core elements.
  • the ferrite tube core can be designed in such a way that it has an impedance of greater than 390 ⁇ /m, preferably greater than 400 ⁇ /m, in the range from 5 kHz to 100 MHz. This represents an advantageous impedance for high frequencies in the range of 5 kHz to 100 MHz.
  • an interference suppression choke for suppressing high-frequency interference.
  • the interference suppression choke comprises an interference suppression choke core according to the first aspect and at least one current conductor which is passed through the ferrite tube core. This provides an interference suppression choke that has an advantageous broadband capability and can be produced in a simple manner.
  • the at least one current conductor may comprise a busbar that is passed through the ferrite tube core. The interference suppression choke can thus be used advantageously in high-frequency applications of busbar systems.
  • the method comprises forming at least two hollow-cylindrical core elements, wherein one of the hollow-cylindrical core elements can be successively arranged in another of the hollow-cylindrical core elements.
  • at least two hollow-cylindrical core elements are formed, which are designed in such a way that these formed hollow-cylindrical core elements are matched to one another in order to be successively arranged one inside the other.
  • the method further includes arranging the at least two hollow cylindrical core elements in an arrangement in which one of the hollow cylindrical core elements is successively arranged in another of the hollow cylindrical core elements, and permanently fastening the at least two hollow cylindrical core elements in the arrangement so that a ferrite tube core is formed.
  • the hollow cylindrical core elements can be arranged successively to one another in a concentric arrangement.
  • the manufactured ferrite tube core can be formed from a highly permeable material, for example the hollow cylindrical core elements can have a magnetic permeability p of at least 2000, ie the relative permeability p r > 2000. This correspondingly manufactured ferrite tube core can provide a filter with an advantageous filter effect and impedance over a wide frequency range, with eddy currents being advantageously suppressed.
  • the ferrite tube core can have precisely two hollow-cylindrical core elements.
  • a specific impedance can thus be achieved over a wide frequency range even with a small number of hollow-cylindrical core elements, for example with a tubular ferrite core with exactly two hollow-cylindrical core elements.
  • the ferrite tube core made according to the third aspect may have an impedance greater than or equal to 580 ⁇ /m, preferably greater than or equal to 600 ⁇ /m, and more preferably greater than or equal to 700 ⁇ /m in the range of 10 kHz to 100 MHz. This represents an advantageous impedance for high frequencies in the range from 10 kHz to 100 MHz.
  • the ferrite tube core can have an impedance of greater in the range from 5 kHz to 100 MHz 390 Q/m, preferably greater than 400 Q/m. This represents an advantageous impedance for high frequencies in the range of 5 kHz to 100 MHz.
  • forming at least two hollow cylindrical core members may include providing the at least two hollow cylindrical core members as pressed green compacts and permanently attaching may comprise sintering the green compacts.
  • the ferrite tube core can be easily formed as compacts by sintering based on the green compacts, wherein the core elements are connected to one another by sintering and the ferrite tube core can thus be easily produced as a compact body in a few work steps.
  • a separating layer is provided by dispersion boundaries between core elements sintered together.
  • forming the at least two hollow-cylindrical core elements can include providing the at least two hollow-cylindrical core elements as pressed green compacts and subsequent sintering of the green compacts, and permanent attachment can include gluing the at least two hollow-cylindrical core elements or successive pressing of the green compacts.
  • the core elements can be provided as ferrite core elements in each case as sintered ferrite core elements in the form of compact core elements, which can then be attached to one another in an adhesive process by means of an adhesive joint. As a result, a desired separating layer can be set through the adhesive joint.
  • a thickness of a separating layer can depend on the resistivity of a material of the separating layer (eg air, epoxy resin/adhesive, metal oxide) and a junction resistance and can be selected appropriately.
  • the separating layer may have a junction resistance of at least 1*10 6 ⁇ or at least 1*10 2 ⁇ m.
  • a thickness of the separating layer can be at most 5% of a radial thickness of a ferrite core element.
  • a first green compact when the green compacts are successively pressed, a first green compact can be formed from a first material, the first green compact can be embedded in a second material, and the green compact embedded in the second material can be pressed, so that successively encased green compacts are formed.
  • the method may further include finishing the at least two hollow cylindrical core elements after sintering by milling the at least two hollow cylindrical core elements into a desired shape. In this way, tolerances in the geometric dimensions of the core elements can be kept very low by milling.
  • the at least two hollow-cylindrical core elements can be formed from different materials, and the method can also include carrying out the sintering according to a previously determined shrinkage of batches of hollow-cylindrical core elements and/or adjusting service and cooling times during sintering to reduce distortion.
  • the at least two hollow cylindrical core elements may be formed from the same material and the method may further include adjusting temperature and cooling times during sintering to reduce warpage.
  • the method according to the third aspect can be used to manufacture the interference suppression choke core according to the first aspect.
  • the method according to the third aspect is carried out in a specific example in order to produce a suppression choke core according to one of the illustrative embodiments of the first aspect described above.
  • the interference suppression choke can also be produced according to the second aspect, with at least one current conductor being passed through the ferrite tube core after the production of the interference suppression choke core or the ferrite tube core being plugged onto at least one current conductor.
  • a suppression choke core can be provided which, in at least some illustrative embodiments of at least one of the first to third aspects described above, has a high permeability and/or can have a substantially constant high permeability.
  • a permeability of greater than 6000 can be provided, for example p r >6000.
  • a high permeability in this frequency range can essentially be maintained in a highly permeable area of the ferrite tube core.
  • the permeability of the ferrite tube core can be essentially constant in the range 1 kHz to 20 kHz, so that the permeability in the frequency range up to 10 kHz can be greater than 9000, e.g. e.g. p r >9000.
  • An interference suppression choke provided according to the second aspect can thus show a corresponding course of the permeability in this frequency range.
  • the permeability in the frequency range up to 50 kHz is greater than 2000, preferably greater than 3000, more preferably greater than 4000, z. e.g. p r > 2000, preferably p r > 3000, more preferably p r > 4000.
  • Fig. 1 schematically shows a known ferrite tube core in a perspective view
  • Fig. 2 schematically shows another known ferrite tube core in a perspective view
  • FIG. 3 schematically illustrates a tube ferrite core in a perspective view according to illustrative embodiments of the invention
  • FIG. 4 schematically shows a suppression choke according to various illustrative embodiments of the invention in a perspective representation
  • Fig. 5 schematically illustrates a relationship between magnetic permeability and frequency in a diagrammatic representation
  • FIGS. 1 and 2 schematically shows a relationship between impedance and frequency in a diagrammatic representation.
  • FIGS. 1 and 2 known ferrite tube cores are shown, which in the further course of the description are compared with a ferrite tube core according to illustrative embodiments of the present invention.
  • the ferrite tube core 1 is formed of a ferrite material.
  • Fig. 2 shows another known ferrite tube core 2 which is formed of individual core elements 2a to 2f arranged in series in a layered stack arrangement.
  • the core elements 2a to 2f are formed congruently with one another.
  • FIG. 3 shows a schematic perspective view of an interference suppression choke core, which is designed as a ferrite tube core 3 according to various illustrative embodiments of the invention.
  • the ferrite tube core 3 comprises two core elements 3a and 3b which are arranged concentrically to one another. This means that the core elements 3a and 3b are formed so that they can be arranged in a concentric arrangement with each other.
  • an inner diameter of the core member 3a is substantially equal to an outer diameter of the core member 3b.
  • the inner diameter of the core member 3a may be larger than the outer diameter of the core member 3b to form a predetermined air gap between both the core members 3a and 3b.
  • FIG. 3 shows only two core elements, this is not a limitation of the present invention and alternatively any number of hollow cylindrical core elements, in particular 3, 4, 5 or more than 5 core elements, can be used to form a ferrite tube core.
  • each of the hollow cylindrical core elements 3a and 3b is formed as a ferrite core element or compact body.
  • each of the hollow-cylindrical core elements 3a and 3b can be sintered separately.
  • at least one of the core elements 3a and 3b can then be reworked, for example in order to be brought to a desired shape by means of a milling machine, with manufacturing tolerances in the production of the ferrite tube core 3 being able to be reduced.
  • the hollow-cylindrical core elements 3a and 3b can be fastened to one another in a gluing process by means of a glue joint.
  • the hollow-cylindrical core elements 3a and 3b can be fastened to one another by clamping after the sintering and the optional further processing. This results in a permanent attachment of the hollow-cylindrical core elements 3a and 3b to one another. All or individual hollow-cylindrical core elements can also be formed from several individual partial ring elements, which can be glued or sintered to form a hollow-cylindrical core element.
  • the hollow cylindrical core members 3a and 3b may be initially provided as green compacts, these green compacts being formed by dry or wet pressing ferrite powder into a desired shape corresponding to a shape of the hollow cylindrical core members 3a and 3b.
  • the pressing can be one-sided pressing, two-sided pressing or isostatic pressing. These green compacts can then be arranged concentrically one inside the other.
  • a sintering process can then be carried out, with the hollow-cylindrical core elements 3a and 3b being provided as core elements sintered together at the end of the sintering process.
  • a dispersion limit occurs between the hollow-cylindrical core elements 3a and 3b, which is due to the fact that, during sintering, a ferrite material is dispersed from a green body corresponding to one of the hollow-cylindrical core elements 3a and 3b into the other green body, corresponding to the other of the two hollow-cylindrical core elements, and thus a more or less sharp dispersion boundary is produced between the at an interface between the green bodies.
  • a dispersion boundary is understood to mean a disperse phase of two different materials that is produced during pressing in the multi-layer process. In a multi-layer process, two different materials are placed in a mold, separated by an inlay/cavity. When removing, the materials mix. In general, dispersion limits are undesirable and should be kept as low as possible in the production process. In some illustrative examples, a ratio of dispersion limits to wall thickness may be less than or equal to 1:100.
  • a ferrite tube core suppression choke core may be formed as follows. Initially, a first tubular core green body (corresponding to a first hollow cylindrical core element) with an outer ring diameter can be provided. A first material can be pressed in a first compression mold to form the first green tube core body with the first outer ring diameter. The first green tube core can be inserted into a larger second mold so that the second mold is significantly larger than the first green tube core and in the second mold around the first green tube core there is more space that can be filled with material be covered with a second material.
  • the first material may differ from the second material in some illustrative examples herein, although this is not a limitation and they may be the same materials, particularly materials of the same composition, where these materials may differ by at least one physical parameter (e.g., without limitation, grain sizes may be different).
  • Both materials in the larger second die are pressed together so that a ferrite green tube core is formed from two successively pressed green tube cores.
  • the second material pressed around the first green tube core body represents a second green tube core body (corresponding to a second hollow-cylindrical core element).
  • the green ferrite tube core body can be subjected to further processing, such as a sintering process.
  • a ferrite green tube core can be formed after at least one repetition of the process steps described above of placing a first green tube core in a larger die, filling space around the first green tube core placed in the larger die with additional material and pressing in the larger die, etc.
  • the resulting ferrite green tube core can in turn be iteratively inserted as a further green tube core into a larger iteratively following further press mold, a material to fill a space around the further green tube core compact arranged in this further press mold and to carry out a pressing process, etc.
  • an interference suppression choke core with hollow-cylindrical core elements successively arranged one inside the other, one hollow-cylindrical core element being successively housed or completely surrounded by another hollow-cylindrical core element.
  • At least one barrier layer may be formed by a metal oxide layer with high R spec (e.g., >10 ⁇ m) or one or more insulators (air gap, adhesive).
  • dispersion boundary areas in the multi-layer process can be in the ratio of dispersion boundary area to wall thickness according to at least 1:10 for a wall thickness > 5mm. In the case of separately pressed green compacts, dispersion limits in a ratio of 1:100 are possible.
  • materials for the different core elements 3a and 3b can be filled into a chamber of a compression mold, the chamber being divided by a cavity. After the chamber has been filled with the materials for the core elements, the cavity can be removed and the material located in the chamber can be pressed. Temperature can also take place during the pressing, so that sintering can be carried out at the same time. Alternatively, a sintering treatment can be carried out at a later point in time after the pressing.
  • the pressing can include one-sided pressing and/or two-sided pressing and/or isostatic pressing.
  • the hollow cylindrical core elements 3a and 3b can be formed from the same material.
  • the hollow-cylindrical core elements 3a and 3b can be formed from different materials. Ferrite materials can be used as the material for forming the core elements 3a and 3b, as are known for use in chokes, in particular interference suppression chokes.
  • materials may have a permeability pi of at least 2000 and/or a resistivity of at most 5 ⁇ m.
  • a suitable material may be chosen based on a trade-off of permeability versus resistivity. In this case, an intended increase in impedance at high frequencies can be achieved by selecting a relatively increased permeability and a simultaneously reduced specific resistance.
  • Exemplary materials are Fi340, Fi360, Fi410, Fi412, Fi415.
  • FIG. 4 shows an interference suppression choke 4 according to some illustrative embodiments in a perspective view.
  • the interference suppression choke 4 comprises an interference suppression choke core in the form of a tubular ferrite core 5 with hollow-cylindrical core elements 5 a and 5 b which are arranged concentrically one inside the other, and a current conductor 6 which is guided through the tubular ferrite core 5 .
  • the current conductor 6 is a busbar, for example a busbar of a busbar system.
  • a wire winding (not shown) can be provided over the ferrite tube core 5 instead of the busbar 6, with the wire winding being able to have a number of windings >1. Referring to Figs.
  • FIGS. 5 and 6 relationships between a magnetic permeability (see Fig. 5) and an impedance (see Fig. 6) with respect to a frequency of a current through a current conductor of a suppression reactor having a ferrite tube core, such as the suppression reactor 4 described above, are shown as provided by the inventor.
  • interference suppression chokes with known ferrite tube cores are compared with an interference suppression choke with a ferrite tube core according to the invention.
  • the representation of the diagrams in Figs. 5 and 6 refers to material properties (complex permeability p' specific resistance
  • the volume, geometry and absolute size of the cores are not necessary for the representation in FIGS.
  • the measurements in Figs. 5 and 6 were carried out in the small-signal range ( ⁇ 0.5 mT), with currents and voltages resulting from the flux density of less than 0.5 mT and from the shape parameter and winding of the core, although the same principle can also be applied to large-signal measurements.
  • FIG. 5 shows a logarithmic scale plot of frequency in units of kHz versus magnetic permeability.
  • a graph 51 shows a relationship between magnetic permeability and frequency for a solid core corresponding to solid core 1 from FIG. 1 .
  • a graph 52 shows a plot of the relationship between magnetic permeability and frequency for a prior art laminated core corresponding to ferrite tube core 2 of FIG. This situation was described above in connection with known layered cores, which can limit the occurrence of eddy currents compared to solid cores, since these layered cores have the smallest possible ratio of a ferrite core area through which flow occurs to the circumference, but do not have an optimal broadband capability, as can be seen from graph 52.
  • a graph 53 is drawn in FIG. 5, which shows a relationship between magnetic permeability and frequency for a ferrite tube core according to the invention, in particular a ferrite tube core corresponding to the ferrite tube core 3 from FIG.
  • the magnetic behavior of the tubular ferrite core according to graph 53 is comparable to the laminated core according to graph 52.
  • the tubular ferrite core according to graph 53 has a high magnetic permeability over a large frequency range with a simple Structure of the ferrite core (two core elements in the ferrite tube core 3 in FIG. 3 versus six core elements in the ferrite tube core 2 in FIG. 2) is achieved.
  • the ferrite core 3 from FIG. 3 Compared to a laminated core, as shown in graph 52 with regard to its magnetic permeability in FIG. 5, the ferrite core 3 from FIG. The structure of the tubular ferrite core 3 from FIG. 3 offers a small-area rectangle with a large aspect ratio and is therefore advantageous in terms of suppressing eddy current losses compared to the known layered core structure, while at the same time an advantageous broadband capability is also provided. According to the knowledge of the inventors, this advantage was achieved in that the ferrite core 3 from FIG. 3 is divided into the core elements 3a and 3b, which are plugged into one another like sleeves, so that an onion structure is formed.
  • the ferrite tube core 3 from FIG. 3 can have a permeability of greater than 1500 in a frequency range up to 20 kHz, for example p r >1500, so that a high permeability in this frequency range can essentially be kept in a highly permeable range.
  • the permeability is essentially constant in the range 1 kHz to 20 kHz, so that the permeability in the frequency range up to 10 kHz is greater than 9000, e.g. B. p r > 9000.
  • the permeability in the frequency range up to 50 kHz is greater than 2000, e.g. e.g.
  • p r > 2000 preferably greater than 3000, e.g. e.g. p r > 3000, more preferably greater than 4000, e.g. B. is p r > 4000.
  • the permeability in the frequency range up to 100 kHz is greater than 2000
  • z. B. is p r > 2000 in the frequency range up to 100 kHz.
  • the core elements 3a and 3b in FIG. 3 plugged into one another to form the onion structure of the ferrite tube core 3 from FIG. 3 can be connected to one another so that a high-impedance form-fitting connection arises between these core elements.
  • additional processing such as grinding and bonding is still required after sintering as described above.
  • FIG. 6 there is shown a graphical representation of a relationship between impedance and frequency for the different ferrite tube cores of FIGS. 1-3.
  • a graph 61 represents a relationship between impedance and frequency for a solid core
  • a graph 62 represents a relationship between impedance and frequency for a laminated core corresponding to the ferrite tube core 2 from FIG Represents the relationship between impedance and frequency for a ferrite core corresponding to the ferrite core 3 of FIG.
  • an impedance for a solid ferrite tube core according to graph 61 is smaller for a large frequency range than an impedance for the ferrite tube cores from Figs. 2 and 3 according to graphs 62 and 63.
  • the impedance behavior of the ferrite tube core according to Fig. 3 is similar to the impedance behavior of the ferrite tube core from Fig. 2.
  • the advantageous impedance behavior according to graph 63 is already with a smaller number of cores achievable elements, since the ferrite tube core of FIG. 2 shows, for example, a layering of six core elements. This represents an increased manufacturing effort, so that a tubular ferrite core according to the invention achieves an advantageous magnetic behavior corresponding to FIGS. 5 and 6 even with a lower manufacturing effort with few core elements. It is thus possible to provide interference suppression chokes in a simplified manner with low production costs with improved performance and greater broadband capability.
  • the ferrite tube core 3 of FIG. 3 may have an impedance of greater than 580 ⁇ /m, preferably greater than 600 ⁇ /m, and more preferably greater than 700 ⁇ /m in the range of 10 kHz to 100 MHz, as measured by the inventor. Furthermore, the ferrite tube core 3 from FIG. 3 can have an impedance of greater than 390 ⁇ /m, preferably greater than 400 ⁇ /m, in illustrative embodiments according to measurements by the inventor in the range from 5 kHz to 100 MHz.
  • the present invention provides tubular ferrite cores which are made up of sleeves inserted into one another to form an onion structure and, with the same degree of subdivision, have a significantly higher broadband capacity than, for example, known layered cores.
  • just two ferrite tube cores plugged into one another can have a better broadband performance compared to a ferrite tube core of the same shape with a layered structure consisting of six layers.
  • shrinkage stage In an intermediate stage of the sintering process, also known as the "shrinkage stage", at sintering temperatures (about 80% of a melting temperature) and optionally under the influence of pressure in the sintering process, shrinkage rates occur, the maximum of which occurs in the region of isothermal sintering, with the shrinkage rates decreasing in a non-linear manner after the maximum is exceeded. Then, in a final stage, the sintered body formed in the sintering process reaches the density of a solid body with a further decreasing shrinkage rate, so that a compact body is formed at the end of the sintering process.
  • the hollow-cylindrical ferrite elements are made of different materials, so that the inventors propose to determine the shrinkage of batches in advance in order to optimize the production process and to take these findings from determined shrinkage values of batches into account during production. Furthermore, the distortion can be influenced to a known extent depending on the sintering process with regard to the cooling times.
  • the inventors recognized that the broadband nature of ferrite tube cores according to the invention depends on the characteristics of the dispersion layer or adhesive joint between different core elements. In particular, it has been recognized that broadband performance is directly proportional to the resistance in the interface layer.
  • a thickness of the separating layer can depend on the specific resistance of the insulator material (air, epoxy resin/adhesive, metal oxide) and a junction resistance of >1*10 6 ⁇ or >1*10 2 ⁇ m.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

La présente invention concerne, selon divers aspects, un noyau de bobine de suppression, une bobine de suppression comprenant un tel noyau de bobine de suppression, et un procédé de fourniture d'un noyau de bobine de suppression. Selon un aspect de la présente invention, un noyau de bobine de suppression comprend au moins deux éléments de noyau cylindrique creux (3a, 3b), l'un des éléments de noyau cylindrique creux (3b) étant disposé successivement, au moins en partie, dans un autre des éléments de noyau cylindrique creux (3a), et les éléments de noyau cylindrique creux (3a, 3b) étant reliés en permanence l'un à l'autre de manière à former un noyau de tube en ferrite (3).
EP23701865.0A 2022-01-20 2023-01-20 Noyau de bobine de suppression, inductance de suppression comprenant un tel noyau de bobine de suppression et procédé de formation d'un noyau de bobine de suppression Pending EP4466724A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022101327.8A DE102022101327A1 (de) 2022-01-20 2022-01-20 Ferritrohrkern, Entstördrossel mit einem solchen Ferritrohrkern und Verfahren zum Bilden eines Ferritrohrkerns
PCT/EP2023/051356 WO2023139204A1 (fr) 2022-01-20 2023-01-20 Noyau de bobine de suppression, inductance de suppression comprenant un tel noyau de bobine de suppression et procédé de formation d'un noyau de bobine de suppression

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EP4466724A1 true EP4466724A1 (fr) 2024-11-27

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US (1) US20250104900A1 (fr)
EP (1) EP4466724A1 (fr)
JP (1) JP2025502422A (fr)
KR (1) KR20240141778A (fr)
CN (1) CN118715581A (fr)
DE (1) DE102022101327A1 (fr)
WO (1) WO2023139204A1 (fr)

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DE102023208877B3 (de) 2023-09-13 2025-01-30 Audi Aktiengesellschaft Verfahren zur Herstellung einer Stromschienenanordnung

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DE975437C (de) * 1952-05-06 1961-11-30 Siemens Ag Entstoerungsdrossel
US5349743A (en) 1991-05-02 1994-09-27 At&T Bell Laboratories Method of making a multilayer monolithic magnet component
DE102012206225B4 (de) 2012-04-16 2024-11-28 Vacuumschmelze Gmbh & Co. Kg Weichmagnetischer Kern mit ortsabhängiger Permeabilität
JP6276205B2 (ja) * 2015-01-23 2018-02-07 Ｊｆｅケミカル株式会社 ＭｎＺｎフェライトコアの製造方法
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US20250104900A1 (en) 2025-03-27
DE102022101327A1 (de) 2023-07-20
KR20240141778A (ko) 2024-09-27
CN118715581A (zh) 2024-09-27
WO2023139204A1 (fr) 2023-07-27
JP2025502422A (ja) 2025-01-24

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