JPH0115140Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an inductor using a magnetic core constructed by laminating sheet-like magnetic materials such as amorphous alloys. In the present invention, an inductor refers to an inductor that has a magnetic core and one or more coils coupled to the magnetic core, and utilizes the self-induction or mutual induction phenomenon that occurs in the coils, such as a chiyoke coil, a transformer, etc. etc. shall be included.

Prior Art Conventionally, ferrite has been well known as a magnetic core material for inductors such as chiyoke coils and transformers, but recently, magnetic cores using amorphous alloys have been attracting attention. The magnetic core made of amorphous alloy has a high squareness ratio in the B-H curve, has a significantly small coercive force, has low core loss, and can suppress temperature rise, so it can be miniaturized. When used as the magnetic core of inductors for power supply circuits, it has excellent advantages such as improved efficiency, wide range voltage control, and stable temperature characteristics. It is expected to be a means to improve efficiency and performance.

By the way, amorphous alloys usually have a sheet shape (ribbon shape) depending on the manufacturing method. For this reason, when an amorphous alloy is used as a magnetic core, unlike magnetic materials such as ferrite, the core cannot take any arbitrary shape, and usually has a toroidal shape. When a toroidal magnetic core is used, a completely closed magnetic path is formed, which has the advantage of having small leakage magnetic flux and an inductor with good high frequency characteristics, but there is no gap for the winding to pass through.
Winding must be done by hand or by mechanical winding such as a chatter method, which makes the winding work extremely troublesome. There are disadvantages such as the inability to use it as an inductor that needs to be adjusted.

In order to eliminate the drawbacks of this toroidal magnetic core, the core 1 is divided into two core members 101 and 102, as shown in FIG.
An inductor having a structure in which the end faces of 01 and 102 are opposed to each other with a magnetic gap G interposed therebetween can be considered. In the case of such a structure, since the ends of the core members 101 and 102 can be assembled by inserting them from both ends of the bobbin 3 on which the coil 2 has been applied in advance, the winding work is very simple. Since there is a gap G, there are advantages such as being able to adjust the magnetic characteristics of the magnetic path.

Problems with the Prior Art However, the inductor having the structure shown in FIG. 1 has a structure in which the core members 101 and 102 are formed by laminating sheet-like magnetic materials such as amorphous alloys. The core members 101 and 102 are deformed during or after assembly due to their return spring properties, and it is difficult to maintain them in a predetermined shape. Therefore, fluctuations in the magnetic gap G and resulting changes in magnetic properties, etc. There are problems such as being easy to invite. Particularly in this type of inductor, the magnetic gap G usually needs to be managed to have a minute interval of several tens to hundreds of micrometers, and the structure described above cannot meet this demand.

Purpose of the present invention Therefore, the present invention aims to maintain the core member in a predetermined shape and easily create a magnetic core by combining two or more core members composed of laminated sheet-like magnetic materials such as amorphous alloys. It is an object of the present invention to provide an inductor that can be assembled and maintains a magnetic gap formed between core members at an accurate value.

Configuration of the Present Invention In order to achieve the above object, the present invention includes two non-magnetic cases, two core members housed in each of the non-magnetic cases, two lids attached to the non-magnetic cases, The inductor includes a coupling spring, and each of the two non-magnetic cases has a U-shaped groove whose surface facing the bottom is an open surface, and an outer surface on the bottom side of the groove. The two core members are a laminate of sheet-like magnetic materials, and are housed in the groove of the non-magnetic case and held in a shape that follows the groove shape, and the two core members are When housed in a magnetic case, the two lids are assembled so that their end faces face each other, and the two lids are respectively attached and fixed to the two non-magnetic cases so as to close the opening surfaces of the grooves. , a protrusion is made to protrude on the outer surface side opposite to the mounting surface, and at least two springs are provided, and these springs are arranged between the protrusions protruding on the bottom outer surface side of the two non-magnetic cases and The two lids are each hooked between the protrusions protruding from the outer surface thereof, and the springs apply a tensile force to the entire lid for connection.

Embodiment FIG. 2 is a front sectional view of an inductor according to the present invention, FIG. 3 is a sectional view taken along line A--A in FIG. 2, and FIG. 4 is an exploded view. In the figure,
The same reference numerals as in FIG. 1 indicate identical components. 4 and 5 are core members 101 and 10
This is a non-magnetic case that stores each of the two separately. In this embodiment, each of the non-magnetic cases 4 and 5 is formed of a suitable synthetic resin or the like into a substantially identical U-shape having a groove 41 or 51, and both end faces thereof are open. Two core members 101 and 102 formed by laminating an appropriate number of sheet-like magnetic materials such as amorphous alloy or silicon steel plates are fitted and housed inside the grooves 41 and 51 of the non-magnetic cases 4 and 5. There is. Therefore, the core members 101 and 102 are stored inside the grooves 41 and 51 in a U-shaped state that follows the shapes of the grooves 41 and 51 of the non-magnetic cases 4 and 5, and the end surfaces thereof are Non-magnetic case 4, 5
It will be exposed to the outside from the opening end face A. 6
and 7 are lids that close one side of the non-magnetic cases 4 and 5. Although not shown in the drawings, after the core members 101 and 102 are housed in the non-magnetic cases 4 and 5, synthetic resin or the like is filled, and the non-magnetic cases 4 and 5 are
It is possible to prevent the core members 101 and 102 from shifting in position within the magnetic gap G, thereby preventing dimensional fluctuations of the magnetic gap G.

As described above, if the core members 101 and 102 are housed inside the non-magnetic cases 4 and 5, the core members 101 and 102, which tend to disintegrate into pieces due to their own springiness,
The shape is constrained to follow the shape of the grooves 41 and 51 of the non-magnetic cases 4 and 5. Therefore, the technical difficulty described above when forming a magnetic core of a predetermined shape using a sheet-like magnetic material such as an amorphous alloy can be solved.

When storing the core members 101 and 102 in the non-magnetic cases 4 and 5, the core members 101 and 102 are stored so that the open end surface A of the non-magnetic case 4 or 5 does not protrude forward from the end surface B of the core member 101 or 102. . In this embodiment, the non-magnetic cases 4 and 5 are housed in such a state that the opening end faces A of the non-magnetic cases 4 and 5 substantially coincide with the end faces B of the core members 101 and 102. In this way, if the structure is such that the open end surface A of the non-magnetic case 4 or 5 is housed so as not to protrude forward from the end surface B of the core member 101 or 102, the core member 101
When the end face rollers of core members 101 and 102 are opposed to each other to form a magnetic gap G between them, the dimensions of the magnetic gap G are set to Since it becomes possible to determine the distance between the end face roller and the roller, the dimensional accuracy of the magnetic gap G increases,
Gap management becomes easier. Suppose that core members 101 and 102
02 is housed in the non-magnetic cases 4 and 5, the opening end surfaces E and I of the non-magnetic cases 4 and 5 will come into contact with each other, and the distance between the magnetic gaps G will be equal to the amount of protrusion of the opening end surfaces A and I. Therefore, it becomes impossible to adjust the magnetic gap G and the magnetic characteristics accordingly. The magnetic gap G may be formed as a gap, but it is preferably formed by filling it with a medium such as synthetic resin. This is because the dimensions of the magnetic gap G can be precisely determined according to the thickness of the filling medium at the same time as assembly.

The non-magnetic cases 4 and 5 house the core members 101 and 102, respectively, and insert one end into the inside of the coil 2 from both sides, align the end surfaces with each other, and are held together by the springs 8 and 9. join to. In this embodiment, protrusions 42 and 52 are provided on the outer surfaces of the bottoms of the non-magnetic cases 4 and 5, respectively, and similar protrusions 6 are provided on the outer surfaces of the lids 6 and 7.
1 and 71, respectively, and the protrusions 42-52
A spring 8 or 9 is connected between 61 and 71 to connect the non-magnetic cases 4 and 5 to the core member 101,
102 and are integrally assembled. With such a structure, it can be assembled by simply hooking the springs 8 and 9, so the assembly work is simplified. In addition, core member 101-1
There is also an advantage that the elasticity of the springs 8 and 9 can be easily adapted to inductors having different gap sizes between the springs 8 and 9. Moreover, since an appropriate constant tensile force can be applied between the core members 101 and 102 by the springs 8 and 9, the dimension of the gap G can be maintained at a constant value over a long period of time. Furthermore, as shown in the embodiment, by locating the springs 8 and 9 within the side surfaces of the non-magnetic cases 4 and 5,
Since it is possible to eliminate the protrusion toward the outer periphery that serves as the mounting surface of the non-magnetic cases 4 and 5, the inductor can be easily mounted on a substrate or the like.

Furthermore, in this embodiment, the non-magnetic cases 4 and 5
Frame portions 43 and 53 are integrally provided on the outer periphery of one end, and the coil 2 is formed using the frame portions 43 and 53 as a bobbin.
It has a structure in which it is wrapped with With such a structure, a bobbin dedicated to winding is not required, so the number of parts is reduced and the size is reduced.

Note that the above embodiment shows an example of an inductor used as a chiyoke coil, so there is only one coil 2, but if it is realized as a transformer, two or more coils 2 are provided.

Effects of the present invention As described above, the present invention has two non-magnetic cases, each having a U-shaped curved groove whose surface facing the bottom is an open surface, and a groove protruding from the outer surface of the bottom side of the groove. The two core members are a laminate of sheet-like magnetic material, and are housed in a groove of the non-magnetic case and held in a shape that follows the groove shape, and are housed in the non-magnetic case. The two lids are attached and fixed to the two non-magnetic cases so as to close the opening surface of the groove, and the outer surface opposite to the mounting surface is At least two springs are provided, and these springs are arranged between the protrusions protruding to the outside of the bottom of the two non-magnetic cases and between the protrusions protruding to the outside of the two lids. They are each latched together and are connected by applying tension to the whole body using a spring, so it is possible to combine two or more core members made by laminating sheet-like magnetic materials such as amorphous amorphous alloys. When configuring a magnetic core, the core member can be maintained in a predetermined shape and easily assembled;
Moreover, it is possible to provide an inductor in which the magnetic gap formed between the core members can be maintained at an accurate value.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional inductor, Fig. 2 is a front partial sectional view of an inductor according to the present invention, and Fig. 3 is a front view of a conventional inductor.
The figure is a sectional view taken along line A--A in FIG. 2, and FIG. 4 is an exploded view of the inductor according to the present invention. 101...Core member, 102...Core member, 2
...Coil, 4, 5...Nonmagnetic case, 8,9...
…Spring.

Claims (1)

[Claims for Utility Model Registration] (1) Two non-magnetic cases, two core members housed in each of the non-magnetic cases, two lids attached to the non-magnetic cases, and a coupling spring. Each of the two non-magnetic cases includes a U-shaped curved groove whose surface facing the bottom is an open surface, and a protrusion protruding from the outer surface of the bottom side of the groove. The two core members are a laminate of sheet-like magnetic materials, and are housed in the groove of the non-magnetic case and held in a shape that follows the groove shape, and are housed in the non-magnetic case. The two lids are respectively attached and fixed to the two non-magnetic cases so as to close the opening surfaces of the grooves, and the mounting surfaces are A protrusion is made to protrude from the opposite outer surface side, and at least two springs are provided, and these springs are arranged between the protrusions protruding from the bottom outer surface side of the two non-magnetic cases and between the two lids. An inductor, wherein the inductor is hooked between the protrusions protruding outwardly, and the spring applies a tensile force to the entire inductor and connects the inductor. (2) The inductor according to claim 1, wherein the sheet-like magnetic material is an amorphous alloy. (3) Claim 1 of utility model registration characterized by having one or more coils
The inductor according to item 1 or 2. (4) The inductor according to claim 3, wherein the coil is directly inserted into the non-magnetic case without having a winding frame.