EP4325536A2 - Noyau magnétique avec boîtier de protection - Google Patents

Noyau magnétique avec boîtier de protection Download PDF

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Publication number
EP4325536A2
EP4325536A2 EP23188066.7A EP23188066A EP4325536A2 EP 4325536 A2 EP4325536 A2 EP 4325536A2 EP 23188066 A EP23188066 A EP 23188066A EP 4325536 A2 EP4325536 A2 EP 4325536A2
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EP
European Patent Office
Prior art keywords
carrier
core
band
toroidal
soft magnetic
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
EP23188066.7A
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German (de)
English (en)
Other versions
EP4325536A3 (fr
Inventor
Axel Schulze
Harald Hundt
Johannes Binkofski
Alfred Auer
Christian Polak
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.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Vacuumschmelze GmbH and Co KG
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Publication date
Application filed by Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP4325536A2 publication Critical patent/EP4325536A2/fr
Publication of EP4325536A3 publication Critical patent/EP4325536A3/fr
Pending 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)
    • H01F41/022—Manufacturing of magnetic circuits made from strip(s) or ribbon(s) by winding the strips or ribbons around a coil
    • 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
    • H01F27/266—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
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/04—Cores, Yokes, or armatures made from strips or ribbons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15308—Amorphous metallic alloys, e.g. glassy metals based on Fe/Ni
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15333—Amorphous metallic alloys, e.g. glassy metals containing nanocrystallites, e.g. obtained by annealing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15391—Elongated structures, e.g. wires
    • 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
    • H01F27/02—Casings
    • 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
    • H01F27/25—Magnetic cores made from strips or ribbons
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • 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

  • This description concerns the area of magnetic cores, inductive components and current transformers.
  • cores made of crystalline iron-based alloys such as silicon-iron, often also amorphous and nanocrystalline alloys are used. Selection criteria for the material of the magnetic core are high permeability, low coercivity (Hc), low losses and high linearity of the hysteresis loop.
  • Methods for producing magnetic cores are known, according to which an amorphous strip is heat-treated under tension and continuously through an oven in order to produce a nanocrystalline strip material, from which a magnetic core (ring strip core) is then wound.
  • the magnetic properties of the nanocrystalline Bands can be adjusted, among other things, by controlling the tension.
  • Such magnetic strip material already has the desired magnetic properties, so that heat treatment is no longer necessary after being wound into a magnetic core, but the strip loses its ductility during the heat treatment and becomes relatively brittle. Brittle strip material can cause problems in the production of magnetic cores because it breaks easily.
  • the inventors have set themselves the task of improving existing concepts for producing wound magnetic cores arranged in a housing, so that comparatively brittle materials in particular can be processed.
  • a device which, according to an exemplary embodiment, has a carrier which has a continuous opening along a longitudinal axis, and at least one soft magnetic tape wound around the carrier to form an annular tape core.
  • the band is wound directly onto the carrier so that there is no play between the ring band core and the carrier.
  • the carrier can therefore serve as part of the housing of the toroidal core.
  • the method comprises attaching a carrier (or a part thereof), which has a through opening along a longitudinal axis, onto a shaft; winding at least one soft magnetic tape around the carrier to form at least one toroidal tape core by rotating the shaft; and removing the carrier including the toroidal core from the shaft.
  • the method comprises attaching a first part of a carrier, which has a through opening along a longitudinal axis, onto a shaft; winding a first soft magnetic tape around the first part of the carrier to form a first toroidal tape core by rotating the shaft; removing the first part of the carrier including the first toroidal core from the shaft; attaching a second part of a carrier; winding a second soft magnetic tape around the second part of the carrier to form a second toroidal tape core by rotating the shaft; removing the second part of the carrier including the second toroidal core from the shaft; and assembling the first and second parts of the carrier together with the toroidal cores wound thereon, the first and second parts of the carrier being coaxial with one another.
  • the exemplary embodiments described here make it possible to produce a wound core from a soft magnetic tape after the tape has been heat treated and thus has final magnetic properties.
  • the tape is then wound directly onto a carrier.
  • the core remains on the carrier, which also forms part of the housing of the magnetic core.
  • the housing is completed by at least a second housing part (outer shell), which is pushed over the magnetic core.
  • the carrier and the outer shell are designed in such a way that they form a closed housing for the magnetic core located on the carrier.
  • the housing can take up a smaller volume than a housing into which a core that has been heat-treated after winding is inserted, since the necessary assembly gaps are eliminated.
  • the assembly of the core is simplified and, as a result, an economical manufacturing process is made possible at lower costs.
  • Assembly is particularly economical if the outer casing (housing part) is so small that no fastening of the end of the wound tape is necessary.
  • the cracking of the outer layer of the wound core is so small that it does not result in a significant change in its magnetic properties.
  • the concept described here for producing a magnetic core is particularly suitable for strips made of comparatively brittle magnetic material (eg nanocrystalline strips heat-treated under tensile stress in a continuous furnace). Since the carrier on which the tape is wound also forms part of the core housing, there is no need to remove the wound core from a winding shaft, which can easily break the brittle band could lead.
  • the concepts described here also make handling the wound core during the further production steps (including before closing the housing) safer and easier.
  • the arrangement of the magnetic core in a closed housing can be an essential prerequisite for further processing, such as winding the core with a conductor (to produce a coil). Electrical insulation can also play a role here, since the metal magnetic core shortens the clearance and creepage distance between two windings arranged on the core. If, according to the exemplary embodiments described here, the magnetic core is wound directly onto a carrier, which then forms part of the housing of the core, as mentioned, the otherwise necessary assembly gaps are eliminated (i.e. there is no play between the toroidal band core and the carrier), which is why there is more magnet volume is possible with the same installation space as with conventional concepts. If insulation is not required in an application, the outer shell of the housing can be omitted and the carrier on which the magnetic core is wound forms an open housing.
  • the soft magnetic band can be made of an iron alloy or a cobalt alloy.
  • the strip is made of an iron alloy described by the formula Fe 100-abcdxyz Cu a Nb b M c T d Si x B y Z z .
  • M denotes one or more elements from the group of elements molybdenum (Mo), tantalum (Ta) or zirconium (Zr)
  • T denotes one or more elements from the group of elements vanadium (V), manganese (Mn), chromium ( Cr), cobalt (Co) or nickel (Ni) and Z one or more elements from the group of elements carbon (C), phosphorus (P) or germanium (Ge).
  • indices a, b, c, d, x, y, and z are given in atomic % and satisfy the following conditions: 0 ⁇ a ⁇ 1.5 , 0 ⁇ b ⁇ 2 , 0 ⁇ b + c ⁇ 2 , 0 ⁇ d ⁇ 5 , 10 ⁇ x ⁇ 18 , 5 ⁇ y ⁇ 11 and 0 ⁇ e.g ⁇ 2 .
  • the alloy can contain up to 1 atomic percent of impurities.
  • the ribbon is made of a cobalt alloy described by the formula Co 100-abcdxyz Fe a Cu b M c T d Si x B y Z z .
  • M denotes one or more elements from the group of elements niobium (Nb), molybdenum (Mo), and tantalum (Ta)
  • T denotes one or more elements from the group of elements manganese (Mn), vanadium (V), chromium (Cr), and nickel (Ni) and Z one or more elements from the group of elements carbon (C), phosphorus (P) and germanium (Ge).
  • indices a, b, c, d, x, y, and z are given in atomic % and satisfy the following conditions: 1.5 ⁇ a ⁇ 15 , 0.1 ⁇ b ⁇ 1.5 , 1 ⁇ c ⁇ 5 , 0 ⁇ d ⁇ 5 , 12 ⁇ x ⁇ 18 5 ⁇ y ⁇ 8th , 0 ⁇ e.g ⁇ 2
  • the alloy may contain up to 1 atomic percent, preferably up to 0.5 atomic percent, of impurities.
  • the tape can be heat treated, with the heat treatment being carried out under tension to achieve desired magnetic properties (Zina material).
  • the soft magnetic band has a nanocrystalline structure, in particular a nanocrystalline structure in which at least 50% by volume of the grains have an average size of less than 100 nm.
  • the soft magnetic tape can have a hysteresis loop with a central linear region, a remanence ratio, Jr /Js of remanence (Jr) to saturation induction (Js) of less than 0.1, and a ratio Hc/Ha of coercivity (Hc) to anisotropy field (Ha ) of less than 0.1.
  • the permeability of the toroidal core can be in the range from 40 to 10,000.
  • Fig. 1 illustrates an exemplary embodiment of a suitable carrier for producing a magnetic core with a housing.
  • Diagram (a) of Fig. 1 shows the carrier 10, which essentially has the shape of a hollow prism (generally a cylinder with any base area), at the ends of which side walls 11 and 12 are arranged. The inner hole runs through the prism along its longitudinal axis.
  • the prism is a cuboid with an approximately square base.
  • differently shaped base areas are also possible.
  • the carrier 10 has the shape of a circular cylinder.
  • the side walls 11 and 12 and the middle part (the hollow prism) are an integral component and can, for example, be made of plastic (eg by injection molding).
  • Diagram (b) of Fig. 1 illustrates an outer shell 20 that matches the carrier 10 from diagram (a).
  • this also has a cuboid shape and its inner dimensions are chosen so that they exactly match the outer dimensions of the side walls 11 and 12 of the carrier 10, so that the outer shell 20 can be pushed over the carrier 20.
  • parts 10 (with side walls 11 and 12) and 20 form a closed housing.
  • a soft magnetic tape is wound around the carrier 10 to produce a wound magnetic core 30.
  • the length of the carrier 10 is dimensioned so that the soft magnetic band fits exactly between the two side walls 11 and 12.
  • the outer cover 20 can be pushed over the wound carrier, whereby the wound core is enclosed on all sides by the housing.
  • the carrier 10 forms part of the housing.
  • Diagram (c) of the Fig. 1 shows a cross section through the magnetic core 30 including the housing (parts 10, 20), the cutting plane being perpendicular to the longitudinal axis of the carrier 10.
  • Diagram (d) of Fig. 1 shows a side view of the magnetic core arranged in the housing, with a conductor 40 being passed through the inner hole of the carrier 10.
  • Fig. 2 illustrates another example of a hollow prism or a hollow cylinder 10, however, consisting of two parts 10a 10b and with a division along the longitudinal axis.
  • the side wall 11 and the part 10a are an integral component. The same applies to the side wall 12 and the part 10b.
  • the parts 10a and 10b may be identical and symmetrical with respect to the longitudinal axis of the carrier 10.
  • parts 10a and 10b When assembled coaxially, parts 10a and 10b form a carrier that looks essentially the same as the carrier in Fig. 1 , diagram (a).
  • the outer shell 20 off Fig. 2 is essentially the same as that in Fig. 1 , diagram (b).
  • a core is only wound around part 10a and part 10b completes the carrier 10 in the axial direction.
  • part 10b may be shorter along the longitudinal axis than part 10a.
  • a toroidal strip core is wound around both the part 10a and the part 10b.
  • the wound parts 10a, 10b are then processed as in the left part of the Fig. 2 shown joined together and then connected to the part 20 to form a housing.
  • the carrier 10 has the shape of a hollow cylinder with an oval base. Unlike the previous examples, the side walls 11 (in Fig. 3 cannot be seen because it is covered) and 12 is not part of the carrier 10, but of the outer shell 20, which is divided into parts 20a and 20b along the longitudinal axis.
  • the parts 20a and 20b can be the same, each have the shape of a half-shell, and together they form the outer shell 20.
  • the parts 20a and 20b can be placed over the core 30 arranged on the carrier 10 are pushed, the parts 20a and 20b together with the carrier 10 completely enclosing the wound core 30.
  • Fig. 3 Diagram (b), shows a cross section through the core 30 including the housing.
  • the carrier 10 may be divided into two or more parts, and a separate core may be wrapped around each part. The supports are then joined together along the longitudinal axis, and after the housing has been completed, the cores are arranged next to one another (coaxially).
  • the carrier 10 has the shape of a hollow cylinder with a circular base, with a side wall 11 being connected to the hollow cylinder.
  • the opposite side wall 12 is connected to the outer shell 20 (see Fig. 4 , diagram (b)).
  • Fig. 4 , Diagram (c) shows the assembly of the housing using a longitudinal section view.
  • the outer shell 20 (with side wall 12) is pushed from right to left over the core 30 wrapped around the carrier 10.
  • the right end of the carrier 10 is pushed into the corresponding opening in the side wall 12, the end of the carrier 10 and the contour of the opening in the side wall 12 being shaped so that the carrier 10 is in the opening in the side wall 12 can snap into place.
  • the two parts are attached to each other using a snap-in connection.
  • the outer shell and the carrier can be held together in a form-fitting manner using the side walls 11 and 12.
  • the housing is closed around the core 30.
  • the housing parts can also be glued or welded (eg using ultrasonic welding).
  • the outer shell 20 is formed from two parts 20a, 20b, with the side wall 11 being connected to the part 20a and the side wall 12 being connected to the part 20b.
  • the side wall and outer shell can each form an integral component.
  • the side walls 11 and 12 each have an opening that can be pushed over one end of the cylindrical support 10.
  • the carrier 10 shows Fig. 5 in the middle there is a circumferential web 15, the outer contour of which can be designed such that the inner contour of the outer casing parts 20a, 20b can snap into the web 15 (snap-in connection).
  • two coaxially arranged cores 30a, 30b can be wound on the carrier 10, a core to the left of the web 15 and another core to the right of the web 15.
  • the two cores 30a and 30b can be made of the same material or of different materials with different magnetic properties exist.
  • the contour of the cross-sectional area of the carrier 10 is in Fig. 5 not visible. It is understood that the cross-sectional area of the carrier 10 may have any shape, such as a circular shape as in the example Fig. 4 , or a square shape, like in the example Fig. 1 .
  • Fig. 6 illustrates an example of an inductive component with a magnetic core 30 including housing according to Fig. 4 and a coil wound around the core 30, for example a choke.
  • the coil can be made of insulated copper wire.
  • two or more coils can be wound around the core, for example to make a transformer or a power converter.
  • Fig. 7 is a cross-sectional representation (section plane normal to the longitudinal axis A), for example a cross-section through the in Fig. 4 shown core.
  • the tape wound into the magnetic core is only shown schematically.
  • the innermost layer (turn) is labeled 3.1
  • the penultimate layer (turn) is labeled 3.N-1
  • the outermost, last layer is labeled 3.N.
  • the core band layers are in Fig. 7 not completely shown. It is desirable that the distance d (the clearance) between the outermost layer 3.N and the inside of the outer shell 20 is as small as possible.
  • the outermost layer 3.N of the tape is not attached to the underlying layer 3.N-1 (e.g. using an adhesive tape or spot welding), the last layer will protrude in an angular range ⁇ (due to the spring effect of the tape). , whereby the smaller the distance d, the smaller the angular range ⁇ .
  • FIG. 7 A cross-section shows the design of a core in which the outer strip layers have not been fixed, meaning that the spiral winding of the core opens slightly.
  • the distance d between the outermost band layer of the core and the inner wall of the housing must be chosen to be as small as possible so that the area in which there is an air gap between the band layers of the core (angle ⁇ ) does not become too large. In practice, it is possible to make the play d so small that the last band layer 3.N does not have to be attached and the protrusion of the band end in the angular range ⁇ does not significantly influence the magnetic properties of the core.
  • Fig. 8 shows a side view of a circular cylindrical carrier 10 (with side wall 12).
  • the carrier 10 can be designed essentially like the carrier Fig. 1 , Diagram (a), with the difference that the central part of the beam 10 (without the side walls 11, 12) has a circular cross section (instead of a square one cross section).
  • the carrier 10 is placed on a shaft 1.
  • the shaft 1 can have a projection 2 which is inserted into a corresponding groove in the inner hole of the carrier when the carrier 10 is plugged onto the shaft 1.
  • Other positive connections e.g. a feather key
  • One exemplary embodiment relates to a method for producing a toroidal strip core.
  • the process involves attaching a carrier to a shaft (cf. Fig. 8 ), wherein the carrier has a through opening along a longitudinal axis into which the shaft can be inserted.
  • the method further comprises winding (at least) a soft magnetic tape around the carrier to form (at least) a toroidal tape core by rotating the shaft.
  • the carrier is removed from the shaft.
  • the method further comprises enclosing the toroidal core in a housing by at least one housing part (see e.g Fig. 1, 2 and 4 , outer shell 20, as well Fig. 3 and 5 , housing parts 20a, 20b) are pushed over the toroidal band core and connected to the carrier, the carrier itself forming part of the housing.
  • That part of the carrier around which the soft magnetic tape is wound has the shape of a hollow cylinder.
  • the hollow cylinder can be circular (cf. Fig. 4 ), oval (cf. Fig. 3 ) or rectangular (cf. Fig. 1 ) have a cross section. Cylinders with a rectangular or square cross section are also called prisms.
  • the carrier can consist of an insulator (e.g. a plastic) or a non-magnetic metal.
  • the carrier on which the toroidal band core is located and/or the at least one housing part (e.g. the outer shell 20, cf. Fig 4 ), which is pushed over the annular band core, has at least one side wall, which lies essentially at right angles to a longitudinal axis of the carrier.
  • the side walls allow for a closed housing for the toroidal core.
  • both side walls are arranged on the carrier, in which in Fig. 4 In the example shown, one side wall is part of the carrier and the other side wall is part of the outer shell.
  • both side walls are parts of the (two-part) outer shell.
  • the individual housing parts can be mounted together in a form-fitting manner, for example using snap-in connections (latching connections), to form a closed housing.
  • snap-in connections latching connections
  • gluing or ultrasonic welding can be used to connect the housing parts.
  • the beginning of the soft magnetic tape is fixed on the carrier before winding, for example using adhesive or adhesive tape. It is not absolutely necessary to fix the end of the band to the underlying band layer.
  • the end of the band which can protrude due to the spring effect of the band, is held by the inside of the housing and secures the ring band core from unwinding.
  • the clearance between the housing and the ring band must be dimensioned accordingly small.
  • a further exemplary embodiment relates to a device with a carrier which has a continuous opening along a longitudinal axis, and at least one soft magnetic tape wound around the carrier to form an annular tape core.
  • the soft magnetic tape is wound directly onto the carrier so that there is no play between the toroidal tape core and the carrier.
  • the device can have at least one housing part which surrounds the toroidal band core and is connected to the carrier in such a way that the at least one housing part together with the carrier forms a closed housing around the toroidal band core.
  • the soft magnetic strip was heat treated before winding, with the desired magnetic properties being set during the heat treatment by applying a tensile stress.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
EP23188066.7A 2022-07-29 2023-07-27 Noyau magnétique avec boîtier de protection Pending EP4325536A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102022119155.9A DE102022119155A1 (de) 2022-07-29 2022-07-29 Magnetkern mit schutzgehäuse

Publications (2)

Publication Number Publication Date
EP4325536A2 true EP4325536A2 (fr) 2024-02-21
EP4325536A3 EP4325536A3 (fr) 2024-05-01

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Family Applications (1)

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EP23188066.7A Pending EP4325536A3 (fr) 2022-07-29 2023-07-27 Noyau magnétique avec boîtier de protection

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Country Link
US (1) US20240038434A1 (fr)
EP (1) EP4325536A3 (fr)
CN (1) CN117476349A (fr)
DE (1) DE102022119155A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
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US3060353A (en) * 1958-05-01 1962-10-23 Honeywell Regulator Co Protected magnetic core element
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CN117476349A (zh) 2024-01-30
US20240038434A1 (en) 2024-02-01

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