JP3240441U - Impulse wire modules and impulse wire module assemblies - Google Patents

Abstract

A compact impulse wire module assembly is provided. An impulse wire module (10) comprising an impulse wire (12), a wire coil (14) formed by a coil wire (16) radially surrounding the impulse wire and arranged at a first impulse wire end (18) of the impulse wire. and a second ferrite member 24 positioned at a second impulse wire end 20 of the impulse wire, the first ferrite member and The second ferrite members each have an electrically conductive coating 30 and the first coil wire end 32 of the coil wire is electrically connected to the electrically conductive coating of the first ferrite member. A second coil wire end 34 of the coil wire is electrically connected to the electrically conductive coating of the second ferrite member. [Selection drawing] Fig. 1

Description

The present invention is an impulse wire module, comprising an impulse wire, a wire coil formed by a coil wire and radially surrounding the impulse wire, and a first wire coil arranged at a first impulse wire end of the impulse wire. and a second ferrite member arranged at a second impulse wire end of the impulse wire. Further, the present invention provides an impulse wire module assembly comprising such an impulse wire module and a printed circuit board having a first electrically conductive contact area and a second electrically conductive contact area. It relates to wire module assemblies.

An impulse wire in the sense of the invention, also called a Wiegand wire, is magnetically bistable and generally has a hard magnetic outer shell and a soft magnetic inner core. When an external magnetic field is applied, the magnetization direction of the impulse wire is instantaneously reversed, thereby generating a short voltage pulse in the wire coil radially surrounding the impulse wire, which voltage pulse is applied to both sides of the coil wire. It can be taken out through the coil wire ends. This effect is called the Wiegand effect and is well known in the prior art. The impulse wire module described in the generic part is also referred to as a Wiegand module or Wiegand sensor for this background.

The impulse wire module described in the generic section is typically arranged on a printed circuit board. For this reason, impulse wire modules are typically equipped with special contact devices that provide electrical connections between both coil wire ends and corresponding electrically conductive contact areas of the printed circuit board. form between

An impulse wire module of this kind is known, for example, from DE 102020100732 A1. The disclosed impulse wire module includes two substantially identical contact devices, one electrically connected to the coil wire ends of the coil wires. The contact device has a plurality of contact members, so-called "legs", each electrically connecting a corresponding coil wire end to a correspondingly arranged electrically conductive contact area of the printed circuit board. there is However, the disclosed contact device is relatively large and as a result requires a relatively large mounting space on the printed circuit board for the disclosed impulse wire module.

The problem set against this background is to provide a compact impulse wire module or a compact impulse wire module assembly.

This problem is solved by an impulse wire module according to the invention with the features of claim 1 and an impulse wire module assembly according to the invention with the features of claim 6 .

The impulse wire module according to the invention comprises an impulse wire (also called Wiegand wire) and a wire coil radially surrounding the impulse wire. The impulse wire is generally linear, that is, straight, and the wire coil radially surrounds an axially central section of the impulse wire. The impulse wire ends of the impulse wire thus project from the wire coil on each axial side of the wire coil.

The impulse wire module according to the invention further comprises two preferably substantially identical ferrite members, the ferrite members having ferrimagnetic properties, typically of a ceramic material which is poorly or impermeably conductive to electricity. , typically consisting of iron oxide. Ferrite members are disposed on both impulse wire ends projecting axially from the wire coil, and a first ferrite member is disposed on the first impulse wire end projecting from the wire coil on a first axial side. A second ferrite member is disposed on a second impulse wire end projecting from the wire coil on a second axial side opposite the first axial side. The ferrite member is typically cylindrical, but in principle may have any arbitrary shape. For example, the ferrite member may be prism-shaped. Typically, the ferrite members each have a central opening into which the corresponding impulse wire end is submerged or through which the corresponding impulse wire end extends. there is The impulse wire ends are preferably glued to the corresponding ferrite members via a relatively soft adhesive, such as silicone, which cures under UV light.

According to the present invention, the first ferrite member and the second ferrite member each have an electrically conductive coating on the outside, and the first coil wire end of the coil wire is the electrical conductor of the first ferrite member. A second coil wire end of the coil wire is electrically connected to the electrically conductive coating on the second ferrite member. The electrically conductive coating may extend over the entire outer surface of the corresponding ferrite member or may extend over only a portion of the outer surface of the corresponding ferrite member. For example, it is conceivable that the electrically conductive coating is applied to only one side of each corresponding ferrite member. In this case, the electrically conductive coating is preferably applied to both ferrite members on the same side. The electrically conductive coating preferably consists of a metal or metal alloy.

In the impulse wire module according to the invention, the electrical connection between both coil wire ends and the corresponding electrically conductive contact areas of the printed circuit board is provided through the electrically conductive coating of both ferrite members. can be made, so that no additional contact device is required for this. This provides a particularly compact impulse wire module.

The impulse wire module is typically mounted on a printed circuit board such that the axial direction of the impulse wire extends parallel to the surface of the printed circuit board. Preferably, the electrically conductive coating of the first ferrite member and the electrically conductive coating of the second ferrite member are therefore each a peripheral surface of the corresponding ferrite member radially surrounding the impulse wire. placed above. The electrically conductive coating may extend over the entire peripheral surface of the corresponding ferrite member or may extend over only a portion of the peripheral surface of the corresponding ferrite member. In the latter case, the electrically conductive coating is preferably applied on the same portion of the peripheral surface on both ferrite members. With an electrically conductive coating disposed on the peripheral surface of each ferrite member, the electrically conductive coatings on both ferrite members are in direct physical contact with the corresponding electrically conductive contact areas of the printed circuit board. which allows easy mounting of the impulse wire module on a printed circuit board, the conductive coating of both ferrite members and the corresponding electrically conductive contact areas of the printed circuit board. ensure reliable electrical contact between

Preferably, the minimum radial circumferential surface diameter of the circumferential surface of the first ferrite member and the minimum radial circumferential surface diameter of the circumferential surface of the second ferrite member are, respectively, the wire coil: greater than the radial wire coil outer diameter. The wire coil thus does not protrude beyond the outer edge of the ferrite member in the radial direction of the impulse wire. This makes it possible to attach the impulse wire module to the printed circuit board via the ferrite member, so that no additional attachment element is required for this purpose. This provides a particularly compact impulse wire module.

Preferably, the electrically conductive coating of the first ferrite member and the electrically conductive coating of the second ferrite member each comprise a copper-tin-alloy. Copper-tin-alloys adhere relatively well on ferrite members and have relatively good electrical conductivity. Further, copper-tin-alloys can generally be bonded relatively easily and reliably to materials typically used for electrically conductive contact areas of printed circuit boards in a material-bonded manner.

Preferably, the first coil wire end is materially bonded to the electrically conductive coating of the first ferrite member and the second coil wire end is materially bonded to the second ferrite member. Bonded to an electrically conductive coating. This provides a reliable electrical connection between each coil wire end and the corresponding electrically conductive coating, which electrical connection can be made relatively easily.

Preferably, the electrically conductive coating of the first ferrite member and the electrically conductive coating of the second ferrite member each have a groove, and both coil wire ends of the wire coil have respective corresponding grooves. It is placed in a groove that The first coil wire end is thus positioned within the groove of the electrically conductive coating of the first ferrite member and the second coil wire end is located within the electrically conductive coating of the second ferrite member. placed in the groove. The coil wire ends are preferably each disposed completely within the groove, which means that the coil wire ends do not protrude radially beyond the radially outer diameter of the respective coating. means. Particularly preferably, the optionally present welded connection for attaching the coil wire ends to the respective electrically conductive coating is also arranged entirely within the groove. This means that the impulse wire module can be placed on a printed circuit board with any area of the electrically conductive coating without in doing so damaging the coil wire ends or possibly existing welded joints. enable This allows a particularly simple mounting of the impulse wire on the printed circuit board.

An impulse wire module assembly according to the present invention comprises the aforementioned impulse wire module according to the present invention and a printed circuit board having a first electrically conductive contact area and a second electrically conductive contact area. .

The impulse wire module according to the present invention has a first ferrite member directly on the first electrically conductive contact area and a second ferrite member directly on the second electrically conductive contact area. As arranged, it is arranged on a printed circuit board. In particular, the impulse wire module has an electrically conductive coating on a first ferrite member electrically connected to a first electrically conductive contact area and an electrically conductive coating on a second ferrite member. , is arranged to be electrically connected to the second electrically conductive contact region. Preferably, the electrically conductive coatings of both ferrite members are each in direct physical contact with corresponding electrically conductive contact areas of the printed circuit board.

In the impulse wire module assembly according to the invention, both coil wire ends are connected to corresponding electrically conductive contact areas of the printed circuit board through the electrically conductive coatings of both ferrite members, so that: No additional contact devices are required for this. This provides a particularly compact impulse wire module assembly.

Preferably, the electrically conductive coating of the first ferrite member is materially bonded to the first electrically conductive contact area and the electrically conductive coating of the second ferrite member is materially bonded to the first electrically conductive contact area. Formally coupled to the second electrically conductive contact area. A material bonded joint provides reliable electrical contact between the electrically conductive coating of the ferrite member and the electrically conductive contact area of the printed circuit board. Furthermore, the impulse wire module is reliably attached to the printed circuit board via a material-bonded connection between the electrically conductive coating of the ferrite member and the electrically conductive contact area, thus no additional mounting means are required.

Two embodiments of the impulse wire module assembly according to the invention comprising the impulse wire module according to the invention are described below with reference to the accompanying drawings.

1 is a schematic side view of a first embodiment of an impulse wire module assembly according to the invention comprising an impulse wire module according to the invention; FIG. FIG. 2 is a plan view of one end face of the impulse wire module shown in FIG. 1; Fig. 2 is a schematic side view of a second embodiment of an impulse wire module assembly according to the invention comprising an impulse wire module according to the invention; FIG. 4 is a plan view of one end face of the impulse wire module shown in FIG. 3;

1 and 2 show impulse wire module assembly 100 comprising impulse wire module 10 and printed circuit board 102 .

The printed circuit board 102 has a first electrically conductive contact area 104 and a second electrically conductive contact area 106 , the contact areas 104 , 106 together being formed on a top surface 108 of the printed circuit board 102 . ing.

The impulse wire module 10 includes a substantially linear impulse wire 12 that extends substantially parallel to the top surface 108 of the printed circuit board 102 .

The impulse wire module 10 comprises a wire coil 14 formed by a coil wire 16 radially surrounding the impulse wire 12 . The wire coil 14 in particular surrounds only a central region of the impulse wire 12, so that a first impulse wire end 18 of the impulse wire 12 on the axial first side projects from the wire coil 14 and axially A second impulse wire end 20 of the impulse wire 12 on the second side of the wire protrudes from the wire coil 14 .

The impulse wire module 10 comprises two substantially identical cylindrical ferrite members 22,24. A first ferrite member 22 is positioned at the first impulse wire end 18 and a second ferrite member 24 is positioned at the second impulse wire end 20 . Both ferrite members 22, 24 each have an axially extending central ferrite member opening 26 through which corresponding impulse wire ends 18, 20 extend. there is The minimum radial circumferential surface diameter D1 of the circumferential surfaces 28 of both ferrite members 22, 24 radially surrounding the impulse wire 12 is each greater than the radial wire coil outer diameter D2 of the wire coil 14. As shown in FIG. Both ferrite members 22 , 24 each have a ferrite member groove 29 extending substantially parallel to the axial direction of impulse wire 12 on peripheral surface 28 .

Both ferrite members 22, 24 each have an electrically conductive coating 30, which in this example consists of a copper-tin-alloy. An electrically conductive coating 30 is deposited on the peripheral surface 28 of each corresponding ferrite member 22,24. The electrically conductive coating 30 is formed such that coating grooves 31 reside within the electrically conductive coating 30 at the ferrite member grooves 29 of the respective ferrite members 22 and 24, respectively.

A first coil wire end 32 of the coil wire 16 is disposed within the coating groove 31 of the electrically conductive coating 30 of the first ferrite member 22 and adheres to the electrically conductive coating 30 of the first ferrite member 22 . Electrically connected, the second coil wire end 34 of the coil wire 16 is disposed within the coating groove 31 of the electrically conductive coating 30 of the second ferrite member 24 and the second ferrite member 24 is electrically connected to the electrically conductive coating 30 of the . The coil wire ends 32 , 34 are in this case each completely disposed within the corresponding coating groove 31 , i.e. projecting radially beyond the outer coating diameter D 3 of the respective electrically conductive coating 30 . Absent. In this embodiment, both coil wire ends 32, 34 are materially bonded to the electrically conductive coatings 30 of the corresponding ferrite members 22, 24, respectively, the materially bonded joints also being It is located entirely within the coating groove 31 .

Impulse wire module 10 has first ferrite member 22 disposed on first electrically conductive contact area 104 and second ferrite member 24 disposed on second electrically conductive contact area 106 . It is located on the printed circuit board 102 as shown. In this embodiment, the electrically conductive coating 30 of the first ferrite member 22 is materially bonded to the first electrically conductive contact area 104 and the electrically conductive coating 30 of the second ferrite member 24 is materially bonded. coating 30 is materially bonded to second electrically conductive contact area 106 . That is, the electrically conductive coating 30 of the first ferrite member 22 is electrically connected to the first electrically conductive contact area 104, and the electrically conductive coating 30 of the second ferrite member 24 is: It is electrically connected to the second electrically conductive contact area 106 .

FIGS. 3 and 4 show an impulse wire module assembly 100' comprising an impulse wire module 10' and a printed circuit board 102', in both figures to indicate features known by the impulse wire module assembly 100. 1 and FIG. 2 with an apostrophe.

Impulse wire module assembly 100' differs from impulse wire module assembly 100 in that both ferrite members 22' and 24' of impulse wire module 10' are substantially rectangular parallelepiped and have no grooves. are different.

Except for the shape of the ferrite members 22', 24', the construction of the impulse wire module assembly 100' basically corresponds to the previously described construction of the impulse wire module assembly 100 shown in FIGS.

10; 10' impulse wire module 12; 12' impulse wire 14; 14' wire coil 16; 16' coil wire 18; 18' first impulse wire end 20; 24' second ferrite member 26; 26' ferrite member opening 28; 28' peripheral surface 29 ferrite member groove 30; 30' electrically conductive coating 31 coating groove 32; wire ends 34; 34' second coil wire ends 100; 100' impulse wire module assembly 102; 102' printed circuit board 104; 104' first electrically conductive contact area 106; Contact area 108; 108' upper surface D1; D1' radial minimum peripheral diameter D2; D2' radial wire coil outer diameter D3 radial coating outer diameter

Claims (8)

An impulse wire module (10; 10'), comprising:
an impulse wire (12; 12');
a wire coil (14; 14') formed by a coil wire (16; 16') radially surrounding said impulse wire (12; 12');
a first ferrite member (22; 22') arranged at a first impulse wire end (18; 18') of said impulse wire (12; 12');
a second ferrite member (24; 24') arranged at a second impulse wire end (20; 20') of said impulse wire (12; 12');
In an impulse wire module (10; 10') comprising
said first ferrite member (22; 22') and said second ferrite member (24; 24') each having an electrically conductive coating (30; 30');
a first coil wire end (32; 32') of said coil wire (16; 16') on said electrically conductive coating (30; 30') of said first ferrite member (22; 22'); are electrically connected and the second coil wire ends (34; 34') of the coil wires (16; 16') are electrically conductive of the second ferrite members (24; 24'); electrically connected to the coating (30; 30′) of
An impulse wire module (10; 10'), characterized in that: said electrically conductive coating (30; 30') of said first ferrite member (22; 22') and said electrically conductive coating (30; 30) of said second ferrite member (24; 24') ') are respectively arranged on the peripheral surfaces (28; 28') of the corresponding ferrite members (22, 24; 22', 24') radially surrounding the impulse wires (12; 12'). Impulse wire module (10; 10') according to claim 1, characterized in that The radial minimum peripheral surface diameters (D1; D1') of the peripheral surfaces (28; 28') of both ferrite members (22, 24; 22', 24') are respectively equal to the wire coils (14; 14'), larger than the radial wire coil outer diameter (D2; D2'). said electrically conductive coating (30; 30') of said first ferrite member (22; 22') and said electrically conductive coating (30; 30) of said second ferrite member (24; 24') 10') according to any one of claims 1 to 3, wherein each of the impulse wire modules (10; 10') consists of a copper-tin alloy. said first coil wire ends (32; 32') being materially bonded to said electrically conductive coating (30; 30') of said first ferrite member (22; 22'); said second coil wire ends (34; 34') are materially bonded to said electrically conductive coating (30; 30') of said second ferrite member (24; 24'); Impulse wire module (10; 10') according to any one of claims 1 to 4. The electrically conductive coating (30) of the first ferrite member (22) and the electrically conductive coating (30) of the second ferrite member (24) each comprise one groove (31). and each of the coil wire ends (32, 34) is arranged in the corresponding groove (31). . An impulse wire module assembly (100; 100') comprising:
an impulse wire module (10; 10') according to any one of claims 1 to 6;
a printed circuit board (102; 102') having a first electrically conductive contact area (104; 104') and a second electrically conductive contact area (106; 106');
with
said electrically conductive coating (30; 30') of said first ferrite member (22; 22') being electrically connected to said first electrically conductive contact area (104; 104'); and wherein said electrically conductive coating (30; 30') of said second ferrite member (24; 24') is electrically connected to said second electrically conductive contact area (106; 106'). As described above, said first ferrite member (22; 22') is disposed on said first electrically conductive contact area (104; 104') and said second ferrite member ( 24; 24') are arranged on said second electrically conductive contact area (106; 106');
Impulse wire module assembly (100; 100'). The electrically conductive coating (30; 30') of the first ferrite member (22; 22') is materially bonded to the first electrically conductive contact area (104; 104'). and said electrically conductive coating (30; 30') of said second ferrite member (24; 24') is materially bonded to said second electrically conductive contact area (106; 106'). 8. Impulse wire module assembly (100; 100') according to claim 7, wherein the impulse wire module assembly (100; 100') is coupled to the

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