EP1776709A1

EP1776709A1 - Inductive component for high currents and method for the production thereof

Info

Publication number: EP1776709A1
Application number: EP05774087A
Authority: EP
Inventors: Roman Brunel; Josef Feth; Gerd Riedel
Original assignee: Epcos AG
Current assignee: TDK Electronics AG
Priority date: 2004-08-12
Filing date: 2005-08-11
Publication date: 2007-04-25
Anticipated expiration: 2025-08-11
Also published as: JP2008509568A; US8063728B2; EP1776709B1; DE102004039230A1; EP2458598A1; WO2006015589A1; CN1993782A; US20080012675A1; EP2458598B1; CN1993782B

Abstract

The invention relates to an inductive component which is suitable for high currents, said component comprising a closed magnetic core (3) and a conductor (1) which is difficult to bend and which passes at least twice through the inside of the magnetic core (3). The conductor (1) is, preferably, composed of several parts (11, 12) which can be, respectively, introduced in an easy manner through the inner hole of the magnetic core (3). The parts (11, 12) of the conductor are mechanically connected together in a fixed manner after introduction, and the connecting point is on the outside of the inner chamber of the magnetic core (3). The advantage of said invention is that said inductive component, which is configured for high currents, can achieve high inductively values with a low construction volume.

Description

Inductive component for high currents and method for its production

The invention relates to an inductive component with a closed magnetic core, which is used in applications for high currents (eg in mains filters).

An inductive component is known from the publications DE 2850657 C2 and CH 290733.

An inductive device suitable for high currents has a current conductor with a large cross-section. The current conductor may be formed as a flexible strand or a hard-to-bend solid conductor (eg busbar).

The present invention has for its object to provide a suitable for high currents inductive component having a high inductance and a small footprint.

This object is achieved by an inductive Bau¬ element with the features of claim 1. Advantageous embodiments of the invention are apparent from further claims.

The invention specifies an inductive component suitable for high currents with a closed magnetic core and a conductor which runs at least twice through the interior of the magnetic core and forms a winding of the inductive component. The conductor comprises a plurality of firmly miteinan¬ connected, pre-bent or angled parts of a Solid conductor, which has a high bending strength.

Two interconnected conductor parts can, for. B. U-shaped, wherein the leg length of the U-piece may be unter¬ different. Two connected Stromlei¬ terteile can also be each formed as an L-piece. The connection of a U-piece with an L-piece is also provided. The conductor parts can be bent twice or bent at least once, to form a U-piece twice, in one variant also more than twice. Wesent¬ Lich is that a leg of the respective conductor part is pushed through the inner hole of the core.

The invention has the advantage that in the case of an inductive component designed for high currents, high inductance values can be achieved with a small constructional volume. When increasing the inductance, the number of turns is quadratic.

With the invention inductive components with a high short-circuit strength can be realized. A solid conductor has the advantage of low ohmic losses compared to a flexible current conductor, which is composed of a plurality of current conductors. The solid conductor has a high dimensional stability and therefore a high mechanical strength. Conductor parts realized from a solid conductor have the advantage that they retain a given shape when connected to further current conductor parts.

A solid conductor in the case of the inductive component according to the invention is to be distinguished from a flexible wire, in particular from a wire which can be wound around a core. The Stromtrag¬ strength of the solid conductor may, depending on the application z. 200A, 500A, 1000A or 2500A. The hard-to-bend The solid conductor is preferably also distinguished from a flexible solid conductor, which has a current carrying capacity of less than 150 A.

The solid conductor preferably represents a busbar or busbar with a rectangular cross section. The solid conductor can, for. B. a copper rail or an aluminum niurαschiene be. The solid conductor can also consist of a different metal with good electrical conductivity. The solid conductor can also be a flat conductor made of stamped metal, z. B. be sheet metal. It is advantageous if at least one of the fixedly interconnected conductor parts has two contact areas which are offset in height relative to one another.

The ladder parts can z. B. U-shaped or L-shaped Flach¬ be parts, wherein transversely extending portions of the conductor part either lie in a plane or in the Ebe¬ NEN, which form an acute angle to each other.

In one variant, the current conductor can be an electrical conductor without an insulating sheathing. In a further variant, the current conductor can have an insulating sheath. The Isolierumhüllung can z. B. be formed by an insulating varnish or a plastic layer.

The conductor is preferably composed of several sub-conductors zu¬ sammengesetzt, z. B. are mechanically firmly connected by screwing, soldering or welding. Such an embodiment of the conductor facilitates the installation of a winding with closed cores. The junction between different parts of the conductor is preferably outside the interior of the magnetic core, for. B. above the plane in which the upper end face of the magnetic core is located, or below the plane in which the lower end face of the magnetic core is located.

The magnetic core may in one variant be designed as a homogeneous closed ring core with or without a gap. The gap may be filled with a material having a different magnetic permeability from the material of the core. In another variant, the magnetic core of meh¬ reren parts, z. B. composed of two U or E parts. The core can also be formed from an E-shaped and a rod-shaped core part, forming two closed magnetic circuits. The gaps formed in this case can be filled with a material having a magnetic permeability different from material of the core. In these columns, an adhesive for connecting the core parts can be arranged together.

The core or the core part can, for. Example of iron, Metall¬ oxides, ceramics, plastics, ferrites or other weichmag¬ genetic materials or alloys thereof. The core or the core part may be composed of iron sheets.

The magnetic core can be multi-part, wherein the core parts each have a closed magnetic circuit and are arranged one above the other along the core axis.

The pre-bent or angled parts of the current conductor can each pass through the inner hole of the magnetic core and then join outside of the inner hole of the core. be connected.

Preferably, pre-bent conductors are assembled in a one-piece magnetic core.

In the case of a composite magnetic core, it is possible first to bend the current conductor or to connect the parts of the current conductor to one another, with turns of a winding being formed. The first core part is pushed through the windings of the current conductor. The first core part is then mechanically connected to a second core part. In a choke with two windings and the second core part is pushed through the turns of another conductor. The two core parts with windings are then mechanically interconnected.

The conductor is preferably fixed in the device so that it does not touch the core. The arrangement of the core and the conductor or parts of the arrangement may be in the housing of the device z. B. be fixed by means of a potting. It is also possible to fasten the core and the current conductor to the housing independently of each other.

The current conductor preferably forms a winding which is wound around the magnetic core. Each turn of the conductor is assigned its own winding level. At the connection point, a part of the current conductor can be angled so that the change from one winding plane to the next level takes place. The transition to the next winding level can also be achieved by angled connecting pieces between the parts of the conductor. The invention can be used, for example, as a current-compensated choke in a line filter suitable for two, three or> 3 current phases.

In one variant, more than just two different windings can be used in the inductive component, the z. B. are electrically connected in each case with a current phase of a polyphase Strom¬ network. In this case, each of the windings is formed substantially like the first current conductor described above.

In a variant (FIG. 3F), it is provided that, in the case of a first conductor part, the opening of the U-piece faces the first end face of the core. In a second Stromleiter¬ part, which is firmly connected to the first part, the opening of the U-piece preferably has the second end face of the core. The legs of the two U-pieces have a Überlap¬ pungsbereich and are firmly connected to each other in this area. The U-pieces are pre-bent in a variant. In another variant, they are ver¬ available as stamped flat parts.

In the following the invention will be described with reference to embodiments and the associated figures. The figures show diagrammatic and not true-to-scale representations of various embodiments of the invention. Identical or equivalent parts are designated by the same reference numerals. It show schematically

1 shows the cross section of an inductive component with ei¬ nem housing Figure 2 is a perspective view of a network filter with an inductive component according to the invention

Figures 3A to 3F process steps in the assembly of the conductor to the magnetic core

Figure 4 is a perspective view of an inductive Bauele¬ ment with a winding which is composed of L-shaped Flachleitertei¬ len.

1 shows an inductive component with a magnetic core 3 and two windings, which are formed by a first conductor 1 and a second conductor 2. The arrangement of the magnetic core 3 and the current conductors 1, 2 is arranged in a Ge housing 4 made of sheet metal. The first conductor 1 is composed of two pre-bent parts 11 and 12. The second current conductor 2 is likewise composed of two pre-bent parts 21 and 22. The parts of the respective Stromlei¬ age are connected to each other by means of fasteners 71 and 72 firmly together, z. B. screwed.

The first part 11 of the first conductor 1 has two openings for receiving fastening elements 71, an opening IIb visible in FIG. 2 in the region of the first terminal 111 of the first conductor 1 and a further opening for receiving a fastening element 73. The Befestigungs¬ element 73 is used for attachment of a not dargestell¬ here th line piece, which produces the electrical connection to the board 8 here.

Depending on the embodiment, the first part 11 of the first current conductor 1 can have only one opening for receiving fastening elements or more than two such openings. The second part 12 of the first conductor 1 has two openings for receiving fastening elements 71, an opening 12b visible in FIG. 2 in the region of the second connection 112 of the first conductor 1 and a further opening 77 for receiving a fastening element 76 (see Fig. 2). The fastening element 76 serves for fastening a line piece, not shown here, which produces the electrical connection to the capacitor 6 in FIG. 2.

The first conductor 1 extends twice through the inner hole 31 of the closed magnetic core 3. The second conductor 2 also passes twice through the inner hole 31 of the magnetic core 3. The second conductor 2 is similar in structure to the first conductor. 1

The parts 11, 12 of the conductor 1 are constructed such that they can be easily inserted through the magnet core 3. The decomposition of the conductor 1 in the Teilstü¬ bridge 11, 12 may, for. For example, as shown in FIG. 3A, such that the distance a between the legs of the U-shaped part 11 is not smaller than the wall thickness b of the magnetic core. After passing through the core, the parts 11, 12 are mechanically connected to one another and fixed relative to the core such that their connection point lies above the plane in which the upper end face of the magnet core 3 is arranged. As a result, the arrangement can be designed to save space, in particular in the direction transverse to the axis of the magnetic core 3. It is advantageous if the connection point between the sections 11, 12 faces away from the inner hole 31 of the magnetic core 3.

The conductor 1 can be broken down into more than two sections depending on the predetermined number of turns. It It is advantageous to design the sections with U-shaped areas, wherein the (preferably shorter) legs of different U-sections partly overlap one another. The core can be inserted between the legs of a U-section. The sections 11, 12 of the first conductor 1 and the sections 21, 22 of the second conductor 2 are preferably angled toward the outside such that the distance between the first component terminals 111 and 211 is smaller than the second component. Terminals 112 and 212 is the same.

Preferably, only parts are used, each of which forms less than a whole turn around the core. They preferably form a half or three quarters turn.

The first conductor 1 is fixed by means of the insulating inserts 51, 53 in the housing 4 and is electrically insulated therefrom. The second conductor 2 is fixed by means of the insulating inserts 52, 54 in the housing 4 and electrically isolated from this. The inserts 51 to 54 are fastened in the housing by means of the fastening elements 74, 75.

The magnet core 3 is a toroidal core with an inner hole 31. The magnet core 3 is here in three parts, wherein the core parts each have a closed magnetic circuit and are arranged one above the other along the core axis. The magnetic core 3 is fixed in the housing 4 such that it does not touch the turns of the current conductors 1, 2. In a further variant, the winding can touch the core if the core is electrically insulated from an electrically insulating material or the winding of core. The housing 4 surrounds the magnetic core 3, the first Strom¬ conductor 1 to its terminals 111, 112 and the second conductor 2 to its terminals 211, 212. The housing 4 has openings 41 for receiving further fastening elements on, with which the entire component z. B. can be mounted on a panel or in a sheet metal cabinet. The openings 41 can also be rivet holes for a housing cover.

Figure 2 shows the perspective view of a network filter with an inductive component according to the invention. In the housing 4 in addition to the inductive component (elements 1, 2, 3) e- lektrisch with this connected capacitors 6 and 81 to 83 are arranged. The capacitors 81 to 83 are mounted on a Lei¬ terplatte 8. The circuit board 8 is electrically connected to the housing 4 by means of a copper strip 84 low inductively.

Figures 3A to 3F show process steps in the assembly of the conductor to the magnetic core.

First, the closed magnetic core 3 and the Teil¬ pieces 11, 12 of the first conductor 1 and the sections 21, 22 of the second conductor 2 are provided. The Teil¬ pieces 11, 12, 21, 22 of the first 1 and the second 2 Strom¬ conductor are U-shaped with an angled longer Schen¬ cle. The first part 11 of the first conductor 1 and the first part 21 of the second conductor 2 is pushed through from below over the wall of the magnetic core 3 (FIGS. 3A, 3B, 3E) and aligned so that the distance to the magnet core 3 is maintained, and z. B. by means of the inserts 51, 52 shown in FIG. 2, z. B. by means of bushings, not shown in the housing of the component fixed (Fig. 3C, 3F). Of the second part 12 of the first conductor 1 and the second part 22 of the second conductor 2 is inserted from above into the inner hole 31 of the magnet core 3 (FIGS. 3B, 3E) and aligned relative to the core and the sections 11, 21 (FIG 3C, 3F), that the openings IIa, 12a of the sections 11, 12 coincide with each other and the distance to the magnetic core 3 is maintained, and z. B. by means of the inserts 53, 54 shown in FIG. 2, z. B. by means of bushings, fixed in the housing of the device (Fig. 3D, 3F). The section 11 is z. B. firmly connected by means of fastening elements with the section 12. The section 21 is z. B. by Befestigungs¬ elements firmly connected to the portion 22. The joining of the sections together can be done before fixing these sections in the housing. The joining of the sections with each other can also be done after fixing these sections in the housing.

The magnetic core can be fixed in a variant prior to the passage of the sections 11, 12, 21, 22 in the housing. In another variant, the magnetic core can only be fixed in the housing after aligning and fixing the sections 11, 12, 21, 22.

In the case of the assembly presented in FIGS. 3A to 3F, the first current conductor 1 is first mounted. After mounting the first conductor 1, the second conductor 2 is mounted in the same manner.

However, the first sections 11, 21 can also be inserted or mounted in a single step, the second sections 12, 22 being inserted and mounted in a further step. The order of the method steps can be chosen in principle belie¬ big.

FIG. 4 shows an inductive component with a winding, which is composed of firmly interconnected L-shaped flat conductor parts 11 ', 12', 13 '. The first flat conductor parts 11 'and 13' are bent so that they each have an obliquely extending portion IIb, 13b. Section IIb or 13b connects the sections IIa and 11c or 13a and 13c arranged in different winding planes. With the oblique portion of the L-piece or by mounting with a height offset (the connecting areas) so succeeds the transition between two winding levels.

Superimposed regions of flat conductor parts 11 ', 12' and 13 'are assigned to a connection region 101, 102, 103, 104. The connecting regions 101 and 103, 102 and 103, 102 and 104 of two flat conductor parts are arranged along each of a diagonal. The flat conductor parts are firmly connected to each other in the connection areas, z. B. welded, bolted or brazed.

The first flat conductor parts 11 'and 13' are connected to each other by means of a second flat conductor part 12 '. The second flat conductor part 12 'has no kink and is arranged in a winding plane. In principle, however, it can also be folded like the parts 11 ', 13'.

In one variant, the winding may comprise more than just two first parts 11 ', 13' and only one second part 12 '. Although only one winding is shown in FIG. 4, at N current phases it is possible to form magnetically coupled inductors. N windings should be provided around the same core, where N = 2, 3, ...

The conductor part 11 'is fixedly connected to the connection piece 111 and the conductor part 13' to the connection piece 112. The connecting pieces preferably each have at least one opening for receiving a fastening element.

The L-pieces in Fig. 4 can be replaced in a variant by U-shaped flat conductor parts, wherein z. B. the ers te U-part is bent so that its connecting piece is inclined. The second U-part can lie in a winding plane or be bent. The Verbindungsstel¬ len of two U-pieces preferably have to end faces of the core.

The magnetic core in Figure 4 is a closed core composed of two interconnected U-pieces. The magnetic core can also be integral.

The invention is not limited to the example presented or certain materials. Further developments of the invention eg. As regards the configuration of the connection point between different parts of the conductor or with respect to the attachment of parts of the arrangement of the core and the conductor are provided.

The in connection with the pre-bent ladder parts 11, 12; 21, 22 explained technical teaching (Fig. 1 - 3F) is readily to appropriately angled, z. B. punched flat conductor parts applicable. In this case, each bend of the Lei¬ terteils 11, 12; 21, 22 replaced by a bend of a Flachlei¬ terteils. LIST OF REFERENCE NUMBERS

1 first conductor

2 second conductor

11 first part of the first conductor

12 second part of the first conductor

21 first part of the second conductor

22 second part of the second conductor IIa, IIb, 12a, 12b openings

111 first connection of the first conductor

112 second connection of the first conductor

211 first connection of the second conductor

212 second terminal of the second conductor

3 magnetic core

31 inner hole of the magnetic core 3

4 housing

41 opening for receiving fastening elements 51 to 54 insulating inserts 6 capacitor

71 to 16 fasteners

77 openings for receiving fasteners 76 8 PCB 81 to 83 capacitors

84 copper tape (electrical connection between the printed circuit board and the housing 4)

Claims

claims

1. Inductive component having a closed magnetic core (3), with a first conductor (1), at least twice through the interior of the magnetic core (3) runs, wherein the first conductor (1) is a solid conductor, which is a plurality of U-shaped pre-bent Includes parts (11, 12) which are firmly connected to each other.

2. The component according to claim 1, wherein the U-shaped pre-bent parts (11, 12) are each a flat conductor, wherein flat portions of the bent flat conductor extend in planes arranged transversely to each other.

3. Inductive component with a closed magnetic core (3), with a first conductor (1) running at least twice through the interior of the magnetic core (3), wherein the conductor (1) a plurality of L-shaped parts (H ', 12' , 13 ') comprises a flat conductor, which are fixed mitein¬ other.

4. The component according to claim 3, wherein the L-shaped parts connected to one another have Ü ends arranged one above the other, which lie in different winding planes.

5. The component according to claim 3, wherein at least one first L-shaped part (H ') is bent such that it arranged in different winding levels flat portions (Ha, Hc) and an obliquely to these levels extending flat portion (IIb) auf¬ points.

6. The component according to claim 4, wherein at least two L-shaped superimposed first parts (H ', 13') are provided, whose diagonally opposite ends are firmly connected to different ends of a second L-shaped part (12 ') are.

7. The component according to claim 5, wherein the second part (12 ') and the ends of the first parts (H', 13 ') connected thereto are arranged in a common plane.

8. The component according to claim 4, wherein the L-shaped parts (11 ', 12', 13 ') are punched.

9. The component according to one of claims 1 to 8, wherein the current conductor (1) is a busbar.

A device according to any one of claims 1 to 9, wherein the current carrying capacity of the conductor (1) is 150 A or more.

11. The device according to any one of claims 1 to 9, wherein the current carrying capacity of the conductor (1) is 500 A or more.

12. The component according to one of claims 1 to 11, wherein the parts (11, 12) of the conductor (1) are mechanically connected to each other.

13. The component according to claim 12, wherein the connection point is located outside a space bounded by two planes in which the end faces of the magnetic core (3) lie.

14. The component according to claim 12 or 13, wherein the current conductor (1) has a plurality of windings each lying in a respective eigen¬ nen winding plane, wherein the transition between two winding levels in the region of the junction takes place.

15. The component according to one of claims 1 to 14, wherein the various parts of the conductor (1) to each other by means of fastening elements (71, 72) are attached.

16. Component according to one of claims 1 to 14, wherein the various parts of the conductor (1) mitein¬ other welded, soldered or riveted.

17. The component according to one of claims 1 to 16, wherein the current conductor (1) has two terminals (111, 112), which are led out to different end faces of the magnetic core (3).

18. The component according to claim 15, wherein the current conductor (1) has openings for receiving fasteners (71, 73, 76).

19. The component according to one of claims 1 to 18, with a housing (4) which encloses the magnetic core (3) and the current conductor (1) completely up to its terminals (111, 112).

20. The component according to claim 19, wherein the magnetic core (3) and the current conductor (1) in Ge housing (4) is fixed by a potting.

21. The component according to one of claims 1 to 20, with at least one second current conductor (2) which runs at least twice through the interior of the magnetic core (3), wherein the second conductor (2) is a solid conductor, the more firmly together U-shaped pre-bent parts or more firmly interconnected L-shaped parts comprises.

22. The component according to one of claims 1 to 21, wherein the magnetic core (3) along its central axis is divided ge into two U-shaped parts or two E-shaped Tei¬ le.

23. Method for producing an inductive component, comprising the following steps:

A) a U-shaped first part (11) of a first Stromlei¬ ters (1) is pushed through the inner hole of a closed Mag¬ netkerns (3);

B) an at least twice angled second part (12) of the first conductor (1) is pushed through the inner hole of the magnetic core (3);

C) the first and second parts (11, 12) of the first power conductor (1) are aligned relative to the magnetic core (3) and opposite each other such that they have mutually overlapping areas;

D) the first and second part (11, 12) of the first Stromlei¬ ters (1) are mechanically fixed together in the overlapping areas.

24. Method for producing an inductive component, comprising the following steps:

A) an angled or pre-bent first part (11) of a first current conductor (1) is pushed through the inner hole ei¬ nes closed magnetic core (3);

B) the first part (11) and an angled or vorgebo¬ gener second part (12) of the first conductor (1) relative to the magnetic core (3) and against each other so aus¬ directed that they have overlapping areas auf¬;

25. The method of claim 24, wherein the angled or pre-bent second part (12) of the first conductor (1) through the inner hole of the Mag¬ netkerns (3) is pushed.

A method according to claim 24 or 25, wherein at least a part selected from the first part (11) and the second part (12) is L-shaped.

27. The method according to any one of claims 23 to 26, wherein the first and second part (11, 12) of the first conductor (1) in the housing (4) of the component is fixed.

28. The method according to claim 27, comprising the following additional steps:

E) a U-shaped first part (21) of a second Stromlei¬ ters (2) is pushed through the inner hole of a closed Mag¬ netkerns (3); F) an at least twice angled second part (22) of the second conductor (2) is pushed through the inner hole of the magnetic core (3);

G) the first and second part (21, 22) of the second Strom¬ conductor (2) are relative to the magnetic core (3) and opposite to each other aligned so that they Ü overlapping areas have;

H) the first and second part (21, 22) of the second Strom¬ conductor (2) are in the overlapping areas mecha¬ nically firmly connected to each other and fi xed in the housing (4).

29. The method of claim 28, wherein steps A) and E) are performed simultaneously; wherein steps B) and F) are performed simultaneously; in which steps C) and G) are performed simultaneously.