EP3320546A1 - Noyau magnétique et bobine de choc ou transformateur équipé d'un tel noyau magnétique - Google Patents

Noyau magnétique et bobine de choc ou transformateur équipé d'un tel noyau magnétique

Info

Publication number
EP3320546A1
EP3320546A1 EP15736283.1A EP15736283A EP3320546A1 EP 3320546 A1 EP3320546 A1 EP 3320546A1 EP 15736283 A EP15736283 A EP 15736283A EP 3320546 A1 EP3320546 A1 EP 3320546A1
Authority
EP
European Patent Office
Prior art keywords
winding
magnetic core
yoke
legs
dad
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Withdrawn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
EP15736283.1A
Other languages
German (de)
English (en)
Inventor
James MILLSAP
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP3320546A1 publication Critical patent/EP3320546A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • H01F3/06—Cores, Yokes, or armatures made from wires
    • 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
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/12—Two-phase, three-phase or polyphase transformers
    • 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 magnetic core for a three-phase choke or a three-phase transformer according to the preamble of claim 1. Furthermore, the invention relates to a three-phase choke or a three-phase
  • a magnetic core according to the
  • the preamble of claim 1 is known for example from DE 10 2012 207 557 AI.
  • the previously known magnetic core has three magnetic legs which are each adapted to receive a first, second or third electrical winding.
  • the first, second and third electrical windings are each associated with a first, second and third electrical phase.
  • the three magnetic legs are arranged in a star shape or triangular shape to one another. This should be advantageous over the previously widespread series arrangement of the legs.
  • the three legs of the known throttle are connected to each other by a yoke, which is formed star-shaped.
  • the yoke has a center point from which three magnetic connecting legs extend in a star-shaped manner to the outside. In this way, the three legs are star-shaped coupled together.
  • the star-shaped design of the yoke has several disadvantages. On the one hand is to mount the yoke on the legs an exact alignment of the
  • the coils of the throttle are largely free at their longitudinal axial ends, since the connecting legs overlap only a small portion of the coils.
  • the star-shaped design of the yoke affects the tilting safety of the throttle. This is especially true when several similar throttles are to be stacked on top of each other. This in turn requires prior alignment of the Orientation of the star-shaped yokes in order to avoid tilting of the second throttle placed on a first throttle.
  • the object of the present invention is to provide a magnetic core which is easy to assemble, has an improved mechanical stability and / or provides good protection for windings of a choke or a transformer. It is another object of the present invention to provide a choke or a transformer with such a magnetic core.
  • this object is achieved with respect to the magnetic core by the subject-matter of claim 1 and H inblick on the choke or the transformer by the subject of claim 14.
  • the invention is based on the idea of a magnetic core for a
  • winding legs for receiving electrical windings, wherein the winding legs are arranged substantially parallel to each other in a triangular shape.
  • the winding legs are connected by an annular or convex polygonal yoke which rests on the winding legs.
  • winding legs in triangular shape is achieved that asymmetries that occur, for example, in-line magnetic legs are avoided.
  • the winding legs are arranged substantially parallel to one another, wherein the winding legs, in particular their longitudinal ends, define a triangular basic shape.
  • the annular or convex polygonal yoke facilitates the manufacture of the magnetic core.
  • the relief is especially beneficial when connecting the yoke to the winding legs.
  • annular yoke When using an annular yoke, alignment of the yoke with respect to the winding legs is no longer necessary. Rather, the annular yoke can be placed in any orientation on the winding legs and thus connect them.
  • the annular or convex polygonal yoke also increases the stability of the magnetic core. This is especially true when multiple magnetic cores
  • Magnet cores is avoided. This facilitates, for example, the installation of multiple magnetic cores in a housing.
  • the annular or convex polygonal yoke forms a protection of the windings of a choke, which is wound around the winding legs, from damage. Because the yoke forms a longitudinal axial barrier, so that a relatively larger proportion of the winding is not readily accessible.
  • a component which is polygonal at least on a circumferential outer side is considered to be convexly polygonal, wherein all inner angles of the polygonal shape are smaller than 180 °.
  • a regular polygonal shaped is a polygonal at least on a circumferential outside polygonal component having the same side lengths and the same inner angle.
  • Polygon shape generally can not only show on an outside. Rather, the yoke can also form a passage opening, which can also be polygonal. In this case, the polygon shape on an outer side of the yoke of the polygon shape in the interior, d. H. the polygon shape of the
  • the yoke as a whole, d. H. looking at the outside be formed hexagonal and a triangular
  • the yoke is located on longitudinal ends of the winding legs. It is not excluded that between the yoke and the longitudinal ends of an air gap is provided. It is essential in any case that between the yoke and the winding leg, a magnetic flux is maintained.
  • the yoke has three
  • Cross-connecting legs may be arcuate, in particular circular arc-shaped, or at least partially rectilinear.
  • the arcuate cross-link legs are curved such that all three cross-link legs together form the annular yoke.
  • rectilinear cross-linking legs is advantageously provided that cross each two cross-link legs in the region of a winding leg.
  • two transverse connecting legs each intersect at longitudinal ends of the winding legs or on a circular arc line on which all the winding legs are arranged.
  • junction point of the cross connection leg is provided.
  • the cross link legs may extend along a circumferential line defined by the triangular arrangement of the winding legs. In the region of the inner surface of the triangular shape, which is predetermined by the winding legs, there is preferably no connection between the transverse connecting legs.
  • Magnetic core This can have a positive effect on the function of a
  • Magnetic currents do not meet in a center of the yoke, but runs along the outline between the winding legs. This affects the functioning of the choke or the transformer.
  • first cross-linking leg in each case a first cross-linking leg a first and second
  • Winding leg, a second cross-link leg a second and third winding leg and a third cross-connecting leg connect the third and first winding legs together.
  • each cross-link leg is connected to two winding legs.
  • the individual cross-linking legs can each be connected only with two winding legs and, if necessary, two cross-linking legs.
  • the magnetic core generally has magnetically conductive properties.
  • the magnetic core is a passive component.
  • the magnetic core does not form an active magnet.
  • the magnetic core can form several magnetic circuits.
  • the magnetic flux within the magnetic core is generated by induction.
  • the first and second winding legs can partially form a first magnetic circuit.
  • a second magnetic circuit may comprise the second and third winding legs and a third magnetic circuit may comprise the third and first winding legs. In all magnetic circuits, a magnetic field can be guided, the magnetic circuits in the
  • the yoke in particular the connecting legs, form a closed mold element.
  • the closed mold element may have a, preferably centrally arranged, passage opening. Since essentially no magnetically conductive material is needed in the center of the yoke to produce adequate magnetic flux within a choke or a transformer, material is saved through the through-opening, which leads to a cost reduction. Furthermore, the
  • the passage opening is also used for ventilation of the magnetic core or a throttle or a transformer, so that overheating of a choke or a transformer is avoided.
  • the yoke can generally be formed in one piece or in several parts.
  • the multi-part design of the yoke can be too Save costs, since standardized magnetic core components can be used. These are only to be assembled and glued, for example.
  • the winding legs can each be formed in one or more parts.
  • multipart constructions of the winding legs and / or the yoke provide good results.
  • a plurality of air gaps between the individual elements of the yoke or the winding leg can be provided. This "multi-gap" design reduces the inductive losses and thus improves the magnetic flux within the magnetic core.
  • the yoke and / or the winding legs may be formed by a pressed powder composite material.
  • Powder composite material which is pressed into the desired shape, in particular a one-piece variant of the yoke can be easily produced.
  • the powder composite preferably comprises iron, nickel, silicon,
  • Powder composite which is used to form the magnetic core, an alloy of nickel, iron and molybdenum or an alloy of iron and nickel or an alloy of iron, silicon and aluminum or an iron-silicon alloy or another iron alloy forms. It is also possible to use a ferrite material, an amorphous material and / or a nanocrystalline material for the magnetic core.
  • the aforementioned materials or material compositions have proven to be particularly suitable for the production of a magnetic core.
  • the magnetic properties of the magnetic core are improved by the use of these materials.
  • the yoke is triangular or hexagon-shaped.
  • the triangular shape offers a high degree of compactness, since it only connects the longitudinal ends of the winding legs.
  • pointed edges are avoided and the stackability of the magnetic core is promoted.
  • the hexagonal yoke covers a larger portion of the windings of the winding legs in the longitudinal axial direction of the magnetic core.
  • Hexagonal shape of the yoke thus contributes to the protection of the windings of a choke or a transformer.
  • Winding leg on a circular or rectangular cross-sectional shape can be designed circular cylindrical or cuboid.
  • Winding leg is cost because of the relatively lower material and tool cost.
  • the use of a rectangular cross-section for the winding legs improves the thermal properties of a choke or a transformer. Because the wrapping of an im
  • Cross-section rectangular winding leg requires an increase in the distance between two windings or windings around the winding leg. This in turn counters the cooling of the windings, since the windings can be flowed through so well with air.
  • the yoke can be glued to the winding legs, in particular the longitudinal ends of the winding legs.
  • an adhesive used, which is highly temperature resistant.
  • the adhesive has a damping property that reduces vibrations between the yoke and the
  • a Ableitschenkel is arranged centrally between the three winding legs, which is connected to the yoke.
  • the Ableitschenkel preferably extends parallel to the three winding legs.
  • the Ableitschenkel can lead, for example, high-frequency alternating magnetic fields and so derive unsymmetrical components or further processed.
  • a subsidiary aspect of the invention relates to a three-phase choke or a three-phase transformer with a magnetic core described above.
  • the three-phase choke and the three-phase transformer also have at least one electrical winding, which surrounds one of
  • Winding leg winds.
  • three electrical windings are provided, wherein in each case one electrical winding is associated with a winding leg of the magnetic core. Every single electrical winding is
  • the winding is formed by a flat wire, in particular a flat enameled copper wire.
  • a flat wire is particularly suitable for low frequencies of alternating current.
  • the flat wire is characterized by a high mechanical stability.
  • the use of a flat wire also leads to an overall compact construction of the throttle or the
  • a flat wire and a round wire may be provided.
  • it can be provided to use copper foil (Cu foil), H F strand or a combination with flat wire or round wire as material for the windings.
  • an H F strand can be combined with a flat wire.
  • Fig. 1 a side view of a throttle according to the invention or of a transformer according to the invention according to a preferred embodiment
  • FIG. 2 shows a top view of the inductor or the transformer according to FIG. 1;
  • FIG. 3 shows a plan view of an alternative throttle or an alternative transformer according to a preferred embodiment.
  • a three-phase throttle and a three-phase alternating current throttle is shown in a side view.
  • the throttle comprises a magnetic core 10 with three winding legs 11, 12, 13.
  • the three winding legs 11, 12, 13 are arranged substantially parallel to one another or extend parallel to a longitudinal axis of the throttle.
  • At their longitudinal ends 18 are the
  • the yoke 14 magnetically couples the three winding legs 11, 12, 13 together. In this case, the yoke 14 with the winding legs 11, 12, 13 may be glued.
  • the winding legs 11, 12, 13 and the yoke 14 may be made of a powder composite material.
  • the magnetic core as a whole is designed in this respect as a powder core.
  • the use of a dust core material has the advantage that in the production of the magnetic core 10 micro air gaps form within the magnetic core 10, which are advantageous for the magnetic permeability.
  • a fourth winding leg is arranged centrally as a diverting leg between the three
  • Winding legs 11, 12, 13 is arranged.
  • the fourth winding leg may have a ferrite core and be capable of carrying a magnetic field that may settle due to asymmetries in the three-phase system.
  • Winding legs 11, 12, 13 be formed and unbalanced
  • Winding legs 11, 12, 13 substantially the same thickness. Thus, an improvement of the magnetic flux is also achieved while reducing the material cost.
  • the three winding legs 11, 12, 13 comprise a first winding leg 11, a second winding leg 12 and a third winding leg 13.
  • the first winding leg 11 carries a first winding 21.
  • Winding leg 12 carries a second winding 22.
  • Winding leg 13 carries a third winding 23.
  • the windings 21, 22, 23 may be identical.
  • the windings 21, 22, 23 are formed by a copper wire, in particular a copper enameled wire.
  • the individual windings 21, 22, 23 each have two winding terminals 20, which serve for the electrical connection of the windings 21, 22, 23. It is preferred if each of the windings 21, 22, 23 is assigned to different phases of a three-phase system. Thus, the first winding 21 of a first electrical phase LI, the second winding 22 of a second electrical phase L2 and the third winding 23 of a third electrical phase L3 be assigned.
  • FIGS. 2 and 3 show two different exemplary embodiments of a throttle, which differ from one another by the geometric shape of the yoke 14.
  • the side view of FIG. 1 applies to both
  • yoke 14 is annular.
  • Magnet core 10 so far comprises an annular yoke 14.
  • the annular yoke 14 has a through hole 19 which is circular.
  • the width of the annular yoke 14 substantially corresponds to the diameter of the winding legs 11, 12, 13.
  • the yoke 14 thus lies fully over the winding legs 11, 12, 13, in particular on the longitudinal ends 18, on.
  • the yoke 14 comprises three cross-link legs 15, 16, 17, which are each formed in a circular arc.
  • a first cross-linking leg 15 connects the first and second winding legs 11, 12 with each other.
  • a second cross-link leg 16 connects the second winding leg 12 with the third winding leg 13.
  • the third winding leg 13 and the first winding leg 11 are connected by a third
  • Transverse connecting leg 17 of the yoke 14 magnetically connected.
  • the yoke 14 covers a relatively large proportion of the windings 21, 22, 23 and provides longitudinal axial protection against damage.
  • the yoke 14 extends as far as the outer edge of the throttle and thus also serves in the radial direction with respect to a central longitudinal axis of the throttle as a stop.
  • Fig. 3 an alternative design of the yoke 14 is shown, wherein the yoke forms a polygonal shape.
  • triangular yoke 14 equipped, which has a triangular passage opening 19.
  • the triangular yoke 14 also has three cross-linking legs
  • Windings 21, 22, 23 leads.
  • the yoke 14 of FIG. 3 increased protection against damage to the windings 21, 22, 23.
  • the cross-connecting legs 15, 16, 17 preferably have a width
  • Diameter of the winding legs 11, 12, 13 corresponds. This allows a good magnetic flux and also reduces the cost of materials for the magnetic core 10th
  • the width of the yoke 14, in particular the cross-linking legs 15, 16, 17 is then adjusted accordingly.
  • the annular or convex polygonal yoke 14 provides an improved footprint for the throttle.
  • the selected geometry facilitates the stackability of a plurality of magnetic cores 10 or of chokes or transformers that are equipped with the magnetic core 10.
  • the throttle is compact overall. At the same time can by appropriate
  • the triangular yoke 14 preferably forms an isosceles, more preferably an equilateral, triangle. This is a particularly compact
  • the stackability of the magnetic core 10 is improved.
  • the transverse connecting legs 15, 16, 17 each have an angle of 60 °.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

L'invention concerne un noyau magnétique (10) destiné à une bobine de choc triphasée ou à un transformateur triphasé comportant trois branches d'enroulement (11, 12, 13) destinées à recevoir des enroulements électriques (21, 22, 23). Les branches d'enroulement (11, 12, 13) sont disposées sensiblement parallèlement les unes aux autres en une forme de triangle. Les branches d'enroulement (11, 12, 13) sont reliées par une culasse (14) annulaire ou en forme polygonale convexe qui s'appuie sur les branches d'enroulement (11, 12, 13). En outre, l'invention concerne une bobine de choc ou un transformateur équipé d'un tel noyau magnétique (10).
EP15736283.1A 2015-07-10 2015-07-10 Noyau magnétique et bobine de choc ou transformateur équipé d'un tel noyau magnétique Withdrawn EP3320546A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/065903 WO2017008833A1 (fr) 2015-07-10 2015-07-10 Noyau magnétique et bobine de choc ou transformateur équipé d'un tel noyau magnétique

Publications (1)

Publication Number Publication Date
EP3320546A1 true EP3320546A1 (fr) 2018-05-16

Family

ID=53540767

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15736283.1A Withdrawn EP3320546A1 (fr) 2015-07-10 2015-07-10 Noyau magnétique et bobine de choc ou transformateur équipé d'un tel noyau magnétique

Country Status (4)

Country Link
US (1) US20180218826A1 (fr)
EP (1) EP3320546A1 (fr)
CN (1) CN108028120A (fr)
WO (1) WO2017008833A1 (fr)

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JP6866324B2 (ja) * 2018-03-01 2021-04-28 株式会社東芝 インダクタユニット、非接触給電システムおよび電動車両
WO2021048352A1 (fr) * 2019-09-13 2021-03-18 Ionate Limited Système de transformation de puissance électrique et processus
RU2753190C1 (ru) * 2020-09-03 2021-08-12 Акционерное общество "Государственный научный центр Российской Федерации "Исследовательский центр имени М.В. Келдыша" Пространственный ленточный магнитопровод
FR3143184A1 (fr) * 2022-12-08 2024-06-14 Valeo Eautomotive France Sas Transformateur triphasé pour convertisseur de tension isolé
FR3143183A1 (fr) * 2022-12-08 2024-06-14 Valeo Eautomotive France Sas Transformateur triphasé pour convertisseur de tension isolé

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Also Published As

Publication number Publication date
CN108028120A (zh) 2018-05-11
US20180218826A1 (en) 2018-08-02
WO2017008833A1 (fr) 2017-01-19

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