EP3669383A1 - Noyau magnétique à fentes et procédé de fabrication d'un noyau magnétique à fentes - Google Patents

Noyau magnétique à fentes et procédé de fabrication d'un noyau magnétique à fentes

Info

Publication number
EP3669383A1
EP3669383A1 EP18752751.0A EP18752751A EP3669383A1 EP 3669383 A1 EP3669383 A1 EP 3669383A1 EP 18752751 A EP18752751 A EP 18752751A EP 3669383 A1 EP3669383 A1 EP 3669383A1
Authority
EP
European Patent Office
Prior art keywords
magnetic
magnetic core
section
core
gaps
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Withdrawn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
EP18752751.0A
Other languages
German (de)
English (en)
Inventor
Jivan Kapoor
Thomas Plum
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3669383A1 publication Critical patent/EP3669383A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/08—Cores, Yokes, or armatures made from powder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • 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
    • H01F41/005—Impregnating or encapsulating
    • 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
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder

Definitions

  • the present invention relates to a process for producing a
  • the document DE 10 2015 218 715 AI discloses a current transformer module with a printed circuit board, in which in recesses of the circuit board, an iron core is integrated.
  • a winding which is a secondary circuit of the
  • Components used for energy conversion are switching power supplies.
  • Soft magnetic cores having one or more gaps, in particular air gaps, are preferably used for the inductive components.
  • the present invention discloses a method for producing a slotted magnetic core, in particular a coil core, with the features of claim 1 and a slotted magnetic core having the features of claim 7.
  • a method of making a slotted magnetic core comprises a step for providing a rotationally symmetrical basic body.
  • This rotationally symmetrical body has a
  • the main body is in an interior around the
  • the method comprises a step for introducing gaps into the second section of the main body with the magnetic ferrite.
  • the second section of the basic body is preferably subdivided into a plurality of uniform segments. Furthermore, it is provided:
  • Section of a non-magnetic material and a rotationally symmetrical second section with a magnetic ferrite The first section and the second section have a common axis of symmetry. Furthermore, a plurality of gaps are arranged in the second section.
  • the columns in the second section divide the second section into multiple segments. Preferably, the second section is divided by the column into a plurality of uniform segments.
  • the present invention is based on the finding that the production of small magnetic cores with air gaps presents a challenge.
  • the core is made of a magnetic
  • Ferrite divided into several individual segments.
  • the individual segments usually have no connection to each other in a conventional core. Therefore, the assembly of the individual segments of such a core into an overall component, especially in the course of miniaturization, is a great challenge.
  • the present invention is therefore based on the idea to take this knowledge into account and to provide a method for producing slotted cores, in particular cores of smaller size, which on the one hand can be realized easily and with precisely defined gaps, and which also creates a core which is simple, efficient and thus cost-effective to process further.
  • This additional portion of non-magnetic material can serve as a support structure, which holds the area of the main body with the magnetic ferrite even in a well-defined position when in the magnetic ferrite column, in particular air gaps, are introduced.
  • this gate is subdivided into a plurality of individual segments.
  • the core with the air gaps can be processed particularly easily.
  • the base body comprises a further, third section with a non-magnetic material.
  • the second section with the magnetic ferrite is in this case arranged along the axis of symmetry between the first section and the third section.
  • Inserting columns in this case can bring in the desired column both in the second section and in the third section and thus divide the second section and the third section into several segments.
  • the individual segments are covered with the magnetic ferrite on two opposite sides of a non-magnetic material.
  • This allows a later-applied wire winding to be kept at a distance from the magnetic part, i. the wire winding is in this case outside the stray fields at the columns.
  • the properties e.g. the losses of an inductive component are improved with such a magnetic core.
  • the step of introducing the nip comprises sawing, in particular mechanical micro sawing, laser cutting, fluid jet cutting (e.g., water jet cutting), or any other suitable method for introducing the gaps of the desired width.
  • sawing in particular mechanical micro sawing, laser cutting, fluid jet cutting (e.g., water jet cutting), or any other suitable method for introducing the gaps of the desired width.
  • fluid jet cutting e.g., water jet cutting
  • methods can be used which are suitable to column with a small gap width in the
  • the width of the column can be in the range of several millimeters.
  • gaps of less than 1 mm in particular gaps of less than 500 micrometers, 200 micrometers, less than 100 micrometers or even smaller gaps can be realized in this way.
  • the method comprises a further step for encasing the base body with an electrical insulating material.
  • the sheathing of the base body with the electrically insulating material can be carried out after the introduction of the column. In this way, the base body and thus the slotted core can be additionally stabilized on the one hand.
  • the core by sheathing can also front
  • the body can be made by any suitable method.
  • sheathing may be by injection molding, spraying, vapor deposition, or other method of applying a sheath to the body.
  • the part or parts can be previously in a separate
  • the attachment of the pre-fabricated parts can be done by any suitable method, for example by gluing or the like.
  • Wire wrapping around the core allows. Furthermore, it is thereby possible to also set a defined distance to a later-applied component housing Moreover, for example, during the
  • providing the base body comprises pressing the starting materials into a desired shape. Furthermore, the provision of the basic body can also be a sintering of the basic body,
  • the gaps of the core have a width of a few millimeters, a millimeter or less than 1 mm.
  • the gaps may have a width of less than 500 microns, less than 200 microns, less than 100 microns, or optionally 50
  • Micrometer 20 micrometers or less. The number of
  • introduced column can be chosen arbitrarily. In particular are for example, one, two, three, four, six, eight, or any other number of columns possible.
  • the core can do this one
  • the height of the core may also be a few millimeters, one or more centimeters.
  • the height of the core is considered to be the core dimension along the axis of symmetry, while the width of the core is considered to be a dimension in the radial direction perpendicular to the axis of symmetry.
  • the core comprises a second section of magnetic ferrite, which, viewed in the direction of the axis of symmetry, is arranged between two sections of a non-magnetic material.
  • the core is at least partially encased with an electrically insulating material.
  • the gaps have a variable width in the radial direction and / or in a direction parallel to the axis of symmetry. In this way, the inductance value of the magnetic core can be made current-dependent. This leads in particular to a
  • FIG. 1 shows a schematic representation of a cross section through a slotted magnetic core according to an embodiment
  • a schematic plan view of a slotted magnetic core according to an embodiment a perspective view of a slotted magnetic core according to an embodiment
  • FIG. 12 is an illustration of a flowchart underlying a method of manufacturing a slotted magnetic core according to an embodiment.
  • Figure 1 shows a schematic representation of a cross section through a base body 10 for producing a slotted magnetic core, as it is based on an embodiment of the present invention.
  • the base body 10 is a rotationally symmetrical basic body which has at least one axis of symmetry AA.
  • rotationally symmetrical means that the basic body 10 can be converted into itself at a predetermined angle by rotation about the axis of symmetry AA.
  • the predetermined angle is 360 degrees / n, where n is a natural number of 2 or more.
  • the main body 10 can thus have the base of a regular polygon.
  • circular base surfaces for the main body 10 or even, for example, oval base surfaces are possible. In the example shown here, the base body along the
  • Symmetry axis A-A has a constant width d. This is only for better understanding and is not mandatory for the formation of a base body 10.
  • the base body 10 is formed from a first portion 11 and a second portion 12.
  • the first section 11 consists of a non-magnetic material.
  • the first portion 11 may be formed of a non-magnetic ceramic or other suitable material having non-magnetic properties.
  • the second section 12 immediately adjoins the first section 11. This second section 12 consists entirely or at least predominantly of magnetic ferrite. Any suitable ferrites are possible here.
  • the main body 10 may be manufactured by pressing a non-magnetic raw material for the first portion 11 and a magnetic material for the second portion 12.
  • Corresponding process steps for producing the pressing and / or sintering can be carried out in a conventional manner.
  • first portion 11 and the second portion 12 should be firmly joined together.
  • a third section 13 may be made of a non-magnetic material analogously to the first section 11
  • the base body 10 has, as previously stated, a rotationally symmetrical shape. In this case, the base body 10 is hollow inside. This means that viewed from the symmetry axis AA radially outward, initially there is a material-free region, which is subsequently followed by a region of magnetic ferrite in the second section 12 or non-magnetic material in the first section
  • a circular base for the main body 10 can thus be formed by the main body 10, a hollow cylinder.
  • the base body 10 preferably has a diameter d of a few millimeters.
  • the base body 10 may have a diameter d of 1 cm, 1.5 cm, 2 cm, 3 cm or 5 cm. In principle, however, larger or smaller diameters d are possible.
  • Base 10 may also have a few millimeters.
  • the height h of the main body may be 5 mm, 10 mm, 15 mm or 20 mm.
  • the height hl of the first section 11 and the height h3 of the optional third section 13 may be in the range of one or a few millimeters.
  • heights of 0.8 mm, 1 mm, 1.5 mm or 2 mm are possible for the first and optional third sections 11, 13.
  • Figure 2 shows a schematic representation of a plan view of a slotted magnetic core 1 according to one embodiment. As can be seen in FIG. 2, one or more gaps 20 are introduced into the main body 10, and here in particular into the second section 12.
  • the introduction of the column 20 into the second section 12 of the main body 10 can be done for example by means of sawing, in particular by means of micro saws.
  • the width b of the column may be in the range of one or more millimeters.
  • the gaps 20 have a width b of less than 1 mm.
  • the gaps 20 may have a width of 500 microns, 200 microns, 150 microns, 100 microns or less respectively. Even gaps with a width b of 50 microns, 20 microns or 10 microns are possible.
  • the width b of the column 20 is smaller than a width of a wire with which the magnetic core 1 is to be wound later. In this way it can be ensured that the wire does not slip into a gap 20 during wrapping.
  • the width b of the column 20 is in the embodiment shown here in the radial direction and parallel to the axis of symmetry A-A constant. Moreover, it is also possible to vary the width b of the column 20 in the radial direction and / or parallel to the axis of symmetry A-A. For example, the individual gaps 20 may have a plurality of sections with a different width b. This way, the width b of a gap 20 in the radial direction and / or parallel to the axis of symmetry A-A may increase (or decrease) in stages. This can be achieved, for example, by introducing the column 20 into the base body 10 in several stages.
  • different cutting widths for the gaps 20 can be incorporated one after the other in several stages, the depth for the machining of the gap being reduced as the cutting width increases.
  • consecutive columns with different widths can be used in the
  • Main body 10 sawn or cut, where column with lesser
  • Width are introduced deeper into the base body 10, while gaps of greater width are introduced less deeply into the base body 10.
  • the width b of the column 20 can also be varied continuously in the radial direction or parallel to the axis of symmetry A-A.
  • the inductance value of the magnetic core 1 can be made current-dependent. This leads in particular to a load-dependent efficiency of applications with a corresponding magnetic core 1.
  • the core 1 preferably has a plurality of gaps 20, for example two, three, four, six, eight or any other number of columns 20.
  • the column 20 which in the main body 20 and in particular in the second section 12 are introduced, at least the second section 12 is divided into several segments.
  • the second portion 12 is divided into a plurality of uniform segments. In this way, the magnetic core 1 after the introduction of the column 20 a
  • column 20 is uniform, i. equidistant, arranged in the base body 10.
  • equidistant distribution of the column 20 is not mandatory.
  • FIG. 3 shows a perspective view of a slotted magnetic core according to one embodiment.
  • the magnetic core 1 is composed of a main body 10 having only a first portion
  • the gaps 20 are introduced into the base body 10 only in the area of the second section 12. In the region of the first portion 11 of the non-magnetic material, no gaps 20 are introduced. In this way, the second portion 12 is divided into a plurality of segments, which are fixed together by the first portion 11 due to the connection between the first portion 11 and the second portion 12.
  • Figure 4 shows a perspective view of a slotted magnetic Kernsl according to another embodiment.
  • the core 1 is formed from a base body 10 having a first portion 11, a second portion 12 and a third portion 13.
  • the gaps 20 are in both the second section 12 and the third
  • Section 13 introduced. Only in the first section 11, no gaps 20 are introduced, so that the segments of the second section 12 and the third
  • Section 13 are fixed together by the connection with the first section 11.
  • a magnetic core 1 as described above, already be wrapped with wire, so as to form an inductance.
  • a previously described core 1 can also be additionally encased by a material, in particular an electrically non-conductive material.
  • the core 1 described above can be completely encased by a suitable electrically non-conductive material.
  • only a partial sheathing of the previously described core 1 is possible.
  • the sheathing of the body can be done by any suitable method.
  • the sheathing may be made, for example, by means of a suitable injection molding process (e.g., by in-mold process) or the like.
  • any other methods for wholly or partially sheathing are possible.
  • a powder coating (powder-coating) or a CVD method (chemical vapor deposition) is possible.
  • the material for the sheath also penetrates into the column 20.
  • the outer region of the core 1 can be encased, while the gaps 20 remain filled with air even after the jacket.
  • a casing of one or more parts can be attached to the GrundölO.
  • the or the parts to be attached can be prepared in advance.
  • this plastic parts can be made separately.
  • Example be produced by means of an injection molding process.
  • the attachment of the separate parts may be accomplished by any suitable method.
  • the parts may be fixed to the main body 10 by gluing or the like.
  • Structuring can be specified. Furthermore, together with the Sheath of the core 1 also an element for an electrical connection of wires are provided for wrapping the core.
  • an element for an electrical connection of wires are provided for wrapping the core.
  • FIG. 5 is a flowchart underlying a method of manufacturing a slotted magnetic core according to an embodiment.
  • a base body 10 is first provided.
  • the base body 10 can in this case the previously described properties of a
  • the main body 10 may have a rotationally symmetrical shape.
  • the base body 10 comprises at least a first portion 11 made of a non-magnetic material and a second portion 12 with a magnetic ferrite.
  • Providing the base body 10 also includes, for example, pressing the magnetic ferrite and the non-magnetic material into one
  • the main body 10 is to comprise an optional third section 13, as has already been described above, then it too can be pressed and / or sintered together with the other two sections.
  • step S2 10 column 20 are in the provided base body
  • the gaps 20 are introduced only into the second section and optionally into the optional third section 13. Specifically, no gaps are introduced into the first section 11, so that the resulting slotted magnetic core 1 has a plurality of magnetic ferrite segments fixed by the continuous nonmagnetic section 11.
  • the main body 10 with the gaps 20 can be encased by a material, in particular an electrically insulating material.
  • a material in particular an electrically insulating material.
  • the formed magnetic core 1 can be stabilized and protected from damage.
  • the present invention relates to the production of a slotted magnetic core with air gaps. For this purpose, it is provided to form a base body with a section of magnetic ferrite and a section of non-magnetic material. Subsequently, in the section with the magnetic ferrite column are introduced, during the
  • Section of the non-magnetic material remains largely unchanged. In this way, by the non-magnetic region, the segments with the ferrite, which are formed by the introduction of the columns, are fixed against each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

La présente invention concerne la fabrication d'un noyau magnétique à entrefers. Pour cela, il est prévu de former un corps de base comprenant une partie en ferrite magnétique et une partie en matériau non magnétique. Ensuite, des fentes sont réalisées dans la partie en ferrite magnétique tandis que la partie en matériau non magnétique reste en grande partie inchangée. De cette manière, les segments comportant la ferrite, qui sont formés par la réalisation des fentes, peuvent être fixés l'un contre l'autre par la région non magnétique.
EP18752751.0A 2017-08-15 2018-08-09 Noyau magnétique à fentes et procédé de fabrication d'un noyau magnétique à fentes Withdrawn EP3669383A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017214219.7A DE102017214219A1 (de) 2017-08-15 2017-08-15 Geschlitzter magnetischer Kern und Verfahren zur Herstellung eines geschlitzten magnetischen Kerns
PCT/EP2018/071567 WO2019034501A1 (fr) 2017-08-15 2018-08-09 Noyau magnétique à fentes et procédé de fabrication d'un noyau magnétique à fentes

Publications (1)

Publication Number Publication Date
EP3669383A1 true EP3669383A1 (fr) 2020-06-24

Family

ID=63165374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18752751.0A Withdrawn EP3669383A1 (fr) 2017-08-15 2018-08-09 Noyau magnétique à fentes et procédé de fabrication d'un noyau magnétique à fentes

Country Status (6)

Country Link
US (1) US20200265980A1 (fr)
EP (1) EP3669383A1 (fr)
KR (1) KR20200037386A (fr)
CN (1) CN110945607A (fr)
DE (1) DE102017214219A1 (fr)
WO (1) WO2019034501A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003520421A (ja) * 2000-01-12 2003-07-02 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 実質上閉じたコア、コア、及び磁気コイルを製造する方法
EP1228517A1 (fr) * 2000-08-24 2002-08-07 Koninklijke Philips Electronics N.V. Procede de fabrication d'un noyau quasiment ferme, d'un noyau et d'un ecran magnetique
FI113416B (fi) * 2000-10-27 2004-04-15 Trafomic Oy Sydänrakenne
US6660412B2 (en) * 2001-03-15 2003-12-09 Waseem A. Roshen Low loss, high frequency composite magnetic material and methods of making the same
DE102005003002A1 (de) * 2004-02-10 2005-08-25 Schaffner Emv Ag Magnetischer Ringkern und Verfahren zur Herstellung von magnetischen Ringkernen
DE202009016566U1 (de) * 2009-12-08 2010-04-08 Triwefo Tridelta Werkzeug- Und Formenbau Gmbh Einhausung für Spulenkörper
DE102015218715A1 (de) 2015-09-29 2017-03-30 Siemens Aktiengesellschaft Stromwandlermodul
CN105703506B (zh) * 2016-03-14 2017-11-10 南京航空航天大学 降低涡流损耗的电机转子结构

Also Published As

Publication number Publication date
US20200265980A1 (en) 2020-08-20
WO2019034501A1 (fr) 2019-02-21
KR20200037386A (ko) 2020-04-08
DE102017214219A1 (de) 2019-02-21
CN110945607A (zh) 2020-03-31

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