EP2956947B1 - Inductance de protection à précontrainte magnétique - Google Patents

Inductance de protection à précontrainte magnétique Download PDF

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Publication number
EP2956947B1
EP2956947B1 EP14725609.3A EP14725609A EP2956947B1 EP 2956947 B1 EP2956947 B1 EP 2956947B1 EP 14725609 A EP14725609 A EP 14725609A EP 2956947 B1 EP2956947 B1 EP 2956947B1
Authority
EP
European Patent Office
Prior art keywords
stack
segment
permanent magnet
magnetically biased
magnet segments
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.)
Active
Application number
EP14725609.3A
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German (de)
English (en)
Other versions
EP2956947A1 (fr
Inventor
Bruce Carsten
Christof Gulden
Stefan Herzog
Alexander Stadler
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.)
Sts Spezial-Transformatoren-Stockach & Co KG GmbH
Original Assignee
Sts Spezial-Transformatoren-Stockach & Co KG 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.)
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Publication date
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Publication of EP2956947A1 publication Critical patent/EP2956947A1/fr
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Publication of EP2956947B1 publication Critical patent/EP2956947B1/fr
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/02—Cores, Yokes, or armatures made from sheets
    • 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
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F2003/106—Magnetic circuits using combinations of different magnetic materials

Definitions

  • the invention relates to a magnetically biased throttle according to the features of the preamble of claim 1.
  • Such a throttle is z. B. off DE 10 2010 013 410 A1 known.
  • Inductors having a magnetic circuit of magnetically soft core material and a coil wound around a portion of the core material are well known in the art of electrical engineering. Frequently, the magnetic circuit also has a gap extending from a first end free end of the core material to an opposite second end free end of the core material.
  • Such inductors or inductors are used for example as a voltage regulator in the form of so-called Wegsetzstellern or boost converters.
  • An example of a so-called boost converter is in the introduction to the DE 198 16 485 A1 and the local FIG. 1 disclosed.
  • EP 1 211 700 A1 an inductive component with a so-called ETD core, in which a permanent magnet segment is inserted in the middle leg or a permanent magnet segment is inserted into the two outer limbs.
  • the DE 24 24 131 A1 describes a similar inductive component in which a segmented permanent magnet is inserted into the gap to minimize eddy current losses in the operation of this inductance.
  • the invention aims to provide a throttle, which is improved compared to the previously known throttles, in particular with regard to their current carrying capacity.
  • the invention thus consists essentially in providing a magnetically biased choke with at least two permanent magnet segments, between which a soft magnetic segment is arranged, wherein the stack has a stacking direction, which is directed from a first yoke to an opposite second yoke of the magnetic circuit and thus a Series arrangement of soft and hard magnetic stacking elements represents.
  • a soft magnetic segment for example, a ferrite segment may be provided. Furthermore, an amorphous, nanocrystalline or even bonded powder material can be used.
  • the current capability can be increased by introducing suitable permanent magnets into a plurality of gaps.
  • At least one insulator or an insulator segment is inserted into the stack of a plurality of soft magnetic segments.
  • the insulator may be, for example, air or an insulating component, namely an insulator segment.
  • insulator segment for example, a plastic segment, such as a plastic disc is suitable.
  • a permanent magnet segment is arranged between all mutually spaced soft magnetic segments.
  • the advantage of as many permanent magnet segments as possible is that, starting from a desired overall remanence of the arrangement, it is possible to use cost-effective magnets.
  • the material of the permanent magnet segments may be a magnetic material made of a rare earth compound, in particular SmCo, NdFeB, SmFeN or a hard ferrite material, in particular SrFe, BaFe or a mixture of these materials.
  • the soft magnetic segments and the permanent magnet segments and possibly the insulator segments have an identical outer contour and are stacked aligned with each other.
  • a circular or angular outer contour of the stack can be provided.
  • a cylindrical stack and, for example, a quadrangular outer contour would result in a square bar as a stack.
  • the magnetic circuit of the throttle according to the invention may be formed as ETD circuit, E-circle, UR-circle or as a shell core and have a single stack with wrapped coil.
  • FIG. 1 shows a first Au arrangementsbeispiel a throttle according to the present invention in side view and sectional view.
  • the throttle is designated by the reference numeral 1 and has a magnetic circuit 10 which is formed as an ETD circuit.
  • the magnetic circuit 10 has a lower, horizontally extending yoke 10a, connect at the left and right ends extending vertically upward yokes 10b and 10c. These two yokes 10b, 10c are connected at their upper end via another, transverse yoke 10d.
  • These yokes 10a, 10b, 10c and 10d are soft magnetic material.
  • a stack 20 of a plurality of soft magnetic segments 22 is placed such that the stack 20 is connected at its upper and lower ends to the lower yoke 10a and the upper yoke 10d.
  • an air gap, permanent magnet segment or an insulator segment can also be placed here.
  • the magnetic circuit 10 with its yokes 10a, 10b, 10c and 10d and the central stack 20 has the typical shape for an ETD structure.
  • a coil 50 is wound.
  • the stack 20 is in FIG. 2 in side view and in FIG. 3 again shown separately in plan view.
  • This stack 20 consists in the embodiment of six superimposed soft magnetic segments 22, which are each arranged at a distance from each other.
  • an air gap or an insulator segment 40 is located between the three uppermost soft-magnetic segments 22.
  • This insulator segment 40 may be, for example, a plastic segment or the like.
  • a permanent magnet segment 30 is placed in each case.
  • FIG. 2 shows an annular outer contour.
  • FIG. 3 shows an annular outer contour.
  • the individual components of the stack 20, so the soft magnetic segments 22, the insulator segments 40 and the permanent magnet segments 30 are fixedly mounted to each other, so in particular glued together.
  • the entire stack 20 is encased or encased in a suitable material.
  • a material for such encapsulation or enveloping offers a resin material, polyamide, polyurethane, polypropylene, epoxy or silicone.
  • This Umgie 7 or wrapping, for example, can be provided tubular, as it is in FIG.
  • Such a sleeve-shaped enclosure 60 has the advantage that the upper side of the uppermost soft-magnetic segment 22 and the underside of the lowermost soft-magnetic segment remain free in order to be able to lie directly against the yokes 10a and 10d mentioned in connection with FIG.
  • the enclosure 60 is in the Figures 2 and 3 with the reference numeral 60 tubular design.
  • the material of the soft magnetic segments 22 may be, for example, ferrite, amorphous material, nanocrystalline material or bonded powder material or in the form of iron sheets.
  • a rare earth compound magnetic material especially SmCo, NdFeB, SmFeN or a hard ferrite material, especially SrFe, BaFe or a mixture of these materials can be used.
  • each of the provided between the soft magnetic segments 22 column can be filled with a permanent magnet segment 30 readily.
  • FIGS. 4 . 5 . 6 and 7 show, readily possible to provide other forms of magnetic circuits 10.
  • FIG. 4 a magnetic circuit 10 in URR form.
  • the magnetic circuit 10 has only two mutually parallel yokes 10a and 10d and between these two yokes 10a, 10d two parallel stack 20 with soft magnetic segments 22 and intermediate permanent magnet segments 30 and in this embodiment, a single intermediate insulator segment 40.
  • both stacks 20 is, as in the previous embodiment of FIG. 1 already explained, each wound a coil 50.
  • These coils 50 are wound around the stack 20 so that the permanent magnet segments 30 and also the air gap 40 are wound by the coil 50.
  • FIG. 5 shows a third embodiment with a magnetic circuit 10 in E-shape.
  • the magnetic circuit 10 consists of a bottom transverse yoke 10a from which two yokes 10b, 10c extend upwardly away. Between these two legs 10b, 10c is the already known stack 20th
  • FIG. 6 shows a magnetic circuit 10 in a U-shape.
  • a transverse yoke 10a of the magnetic circuit 10 provided, sit on the end of the already known stack 20 and are each wrapped by a coil 50.
  • FIG. 7 shows a magnetic circuit 10 in UR form with a yoke 10a, which is transverse and has a rectangular cross-sectional contour. From this yoke 10a extends left also with rectangular cross-section, a yoke 10b in one piece upward. At the right end of the yoke 10a sits the already known stack 20 with its soft magnetic segments 22 and the permanent magnet segments 30 and an air gap 40th
  • FIG. 8 shows a throttle with a shell core, which has a circular yoke 10 with upper and lower lids and a centrally arranged stack 20 with permanent magnet segments 30 and soft magnetic segments 22.
  • FIG. 9 two almost identical magnetic circuits 10 are shown, similar to FIG. 1 wherein only the center stack 20 varies in number of permanent magnet segments 30 used.
  • the already known reference numerals stand for the same parts.
  • the magnetic circuits 10 of FIG. 8 at the points where between the soft magnetic segments 22 permanent magnet segments 30 are used, only arrows entered.
  • the soft magnetic segments 22 are directly adjacent to each other.
  • the stack 20 has a total of eight soft magnetic segments 22. Between each soft magnetic segments 22 is in each case a permanent magnet segment 30. The entire stack 20 is wound by a coil 50. In the presentation of FIG. 9 on the right, the stack 20 is also equipped with eight soft magnetic segments 22. However, only between the fourth and fifth soft magnetic segment 22 is a single permanent magnet segment 30, which is significantly thicker than the seven permanent magnet segments 30 of FIG FIG. 9 is left together. The entire stack 20 is in turn wrapped by a coil 50.
  • Such cantilevered fields are responsible for ensuring that a large gap between two soft magnetic segments 22 is effective has a larger cross-section. As a result, the magnetic resistance of the gap decreases, which is compensated by broadening the gap again.
  • Throttle shown to the right has a single gap, in which a permanent magnet segment 30 is used with a thickness of 5.0 mm and on this permanent magnet segment 30 above and below immediately adjacent a soft magnetic segment 22, this corresponds to a throttle, as in FIG. 9 is shown on the left with seven columns, in each of which a permanent magnet segment 30 is inserted, these need only have a thickness of 0.495 mm. If one adds these seven thicknesses of the permanent magnet segments 30, the result is indeed only a total gap or a total thickness of the individual permanent magnet segments 30 of 3.465 mm. However, these correspond to an effective thickness of 5.0 mm due to the losses discussed above to obtain the same initial inductance. The concrete conversion takes place with the aid of the known method of conformal mappings from the theory of functions.
  • FIG. 10 is the inductance curve of the two in FIG. 9 chokes recorded as a function of the current at the same initial inductance of approximately 100 uH.
  • the solid line corresponds to the one in FIG. 9 Throttle shown on the right with a thick permanent magnet segment 30, while the dashed line of the throttle in FIG. 9 corresponds to the left.
  • the in FIG. 9 chokes shown have a stack 20, with identical outer diameter, so shows FIG. 10 clearly that when using more than one permanent magnet segment 30, the inductance curve is shifted to the right.
  • FIG. 11 is a further embodiment of a throttle according to the invention shown.
  • This embodiment corresponds largely to the representation of a throttle of FIG. 1 ,
  • thirteen soft magnetic segments 22 are now provided in the stack 20, for example, the permanent magnet segments 30 inserted between these soft magnetic segments 22 being significantly narrower than the remaining components of the stack 20. This means that the soft magnetic segments 22 on the left and right in the sectional view of FIG FIG. 11 project beyond the permanent magnet segments 30.
  • each a narrower permanent magnet segment 30 is inserted.
  • These permanent magnet segments 30 are also significantly thinner than the soft magnetic segments 22 are formed.
  • These insulator segments 40 are in their outer contour equal to the outer contour of the soft magnetic segments 22, but may also be formed narrower than this or even wider than this if necessary.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Dc-Dc Converters (AREA)

Claims (14)

  1. Bobine d'induction à précontrainte magnétique (1), comprenant les caractéristiques suivantes :
    - un circuit magnétique (10) équipé d'au moins une pile (20) de plusieurs segments magnétiques doux (22) dont au moins une partie sont situés à distance,
    - une bobine (50) qui est enroulée autour de la pile (20),
    - dans la pile (20) sont insérés au moins deux segments d'aimant permanent (30),
    - au moins un segment magnétique doux (22) est monté entre les segments d'aimant permanent (30),
    - la pile (20) a une direction d'empilement qui est orientée entre une bride (10a) et une autre bride (10d) située à l'opposé, du circuit magnétique (10), et
    - la bobine (50) a un axe de bobine qui est parallèle à la direction d'empilement,
    caractérisée en ce que
    la pile (20) est équipée d'une enveloppe tubulaire (60) de sorte que la face supérieure du segment magnétique doux (22) supérieur de la pile (20) et la face inférieure du segment magnétique doux (22) inférieur de la pile restent libres de façon à être directement appliquées contre les brides (10a, 10d) du circuit magnétique (10).
  2. Bobine d'induction à précontrainte magnétique (1), conforme à la revendication 1,
    caractérisée en ce que
    l'enveloppe (60) est constituée par une masse coulée par laquelle les différents composants de la pile (20) sont liés solidairement les uns aux autres.
  3. Bobine d'induction à précontrainte magnétique (1), conforme à la revendication 1 ou 2,
    caractérisée en ce que
    dans la pile (20) constituée par plusieurs segments magnétiques doux (22) est monté au moins un isolant ou un segment isolant (40).
  4. Bobine d'induction à précontrainte magnétique (1), conforme à l'une des revendications 1 à 3,
    caractérisée en ce qu'
    entre tous les segments magnétiques doux (22) situés à distance les uns des autres, est respectivement monté un segment d'aimant permanent (30).
  5. Bobine d'induction à précontrainte magnétique (1), conforme à l'une des revendications 1 à 4,
    caractérisée en ce qu'
    le matériau constitutif des segments d'aimants permanents (30) est un matériau magnétique à base d'un composé de terres rares, en particulier de SmCo, NdFeB, SmFeN ou un matériau à base de ferrite dure, en particulier de SrFe, BaFe ou un mélange de ces matériaux.
  6. Bobine d'induction à précontrainte magnétique (1), conforme à l'une des revendications 1 à 5,
    caractérisé en ce que
    les segments magnétiques doux (22) et les segments d'aimant permanent (30) ont un contour externe (A) identique et sont empilés en étant orientés les uns vers les autres.
  7. Bobine d'induction à précontrainte magnétique (1), conforme à la revendication 6,
    caractérisée en ce que
    les segments magnétiques doux (22) et les segments d'aimant permanent (30) ont un contour externe (A) circulaire ou angulaire.
  8. Bobine d'induction à précontrainte magnétique (1), conforme à l'une des revendications 1 à 7,
    caractérisée en ce que
    le circuit magnétique (10) est réalisé sous la forme d'un circuit ETD, d'un circuit E, d'un circuit UR ou d'un noyau hémisphérique et comporte une seule pile (20) autour de laquelle est enroulée une bobine (50).
  9. Bobine d'induction à précontrainte magnétique (1), conforme à l'une des revendications 1 à 7,
    caractérisée en ce que
    le circuit magnétique (10) est réalisé sous la forme d'un circuit URR, d'un circuit U ou d'un circuit UR équipé de deux piles (20) situées à proximité l'une de l'autre et respectivement enveloppées par une bobine (50) enroulée autour de celle-ci.
  10. Bobine d'induction à précontrainte magnétique (1), conforme à l'une des revendications 1 à 9,
    caractérisée en ce que
    la pile (20) constituée de segments magnétiques doux (22), de segments d'aimant permanent (30) et le cas échéant, de segments isolants (40) est préparée sous la forme d'une unité portative prémontée (E).
  11. Bobine d'induction à précontrainte magnétique (1), conforme à la revendication 10,
    caractérisée en ce que
    les différents composants de la pile (20) sont reliés solidairement les uns aux autres, en particulier collés, scellés par coulée ou enveloppés.
  12. Bobine d'induction à précontrainte magnétique (1), conforme à l'une des revendications 1 à 11,
    caractérisée en ce que
    le segment magnétique doux (22) est un segment de ferrite.
  13. Bobine d'induction à précontrainte magnétique (1), conforme à l'une des revendications 1 à 12,
    caractérisée en ce que
    le segment magnétique (22) est un matériau amorphe, nanocristallin ou un matériau pulvérulent lié.
  14. Bobine d'induction à précontrainte magnétique (1), conforme à l'une des revendications 1 à 5,
    caractérisée en ce que
    les segments magnétiques doux (22) dépassent latéralement des segments d'aimant permanent (30).
EP14725609.3A 2013-05-02 2014-05-02 Inductance de protection à précontrainte magnétique Active EP2956947B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013208058.1A DE102013208058B4 (de) 2013-05-02 2013-05-02 Magnetisch vorgespannte Drossel
PCT/DE2014/100154 WO2014177137A1 (fr) 2013-05-02 2014-05-02 Inductance de protection à précontrainte magnétique

Publications (2)

Publication Number Publication Date
EP2956947A1 EP2956947A1 (fr) 2015-12-23
EP2956947B1 true EP2956947B1 (fr) 2018-06-27

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14725609.3A Active EP2956947B1 (fr) 2013-05-02 2014-05-02 Inductance de protection à précontrainte magnétique

Country Status (5)

Country Link
US (1) US20160042855A1 (fr)
EP (1) EP2956947B1 (fr)
DE (1) DE102013208058B4 (fr)
ES (1) ES2688578T3 (fr)
WO (1) WO2014177137A1 (fr)

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DE102014218043A1 (de) * 2014-09-10 2016-03-10 Würth Elektronik eiSos Gmbh & Co. KG Magnetkern, induktives Bauteil und Verfahren zum Herstellen eines Magnetkerns
WO2020042912A1 (fr) * 2018-08-31 2020-03-05 浙江盘毂动力科技有限公司 Noyau de segment et moteur à flux axial
CN114582601A (zh) * 2020-11-30 2022-06-03 伟创力有限公司 磁芯组件、电子设备及制造磁芯组件的方法

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Also Published As

Publication number Publication date
DE102013208058B4 (de) 2015-09-10
ES2688578T3 (es) 2018-11-05
US20160042855A1 (en) 2016-02-11
WO2014177137A1 (fr) 2014-11-06
EP2956947A1 (fr) 2015-12-23
DE102013208058A1 (de) 2014-11-06

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