JPS605215B2 - electromagnetic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electromagnetic devices such as choke coils and leakage transformers used in discharge lamp ballasts and the like.

Figures 1 and 2 show conventional examples of choke coils used in discharge lamp ballasts, in which 1 is an iron core in which a laminated E-type iron core 2 and T-type iron core 3 are butted against each other, 4 is a bobbin 5
This is a coil with wire wound around it, and is inserted into the center leg of iron core-1.

Reference numeral 6 denotes a mounting base, which has short rising parts 7 on both sides of the top plate, mounting holes 8 are provided at both ends, and the central part of the rising parts 7 is bent to fit into the notch 9 at the outer end of the iron core 1. Caulking 10 is applied to firmly integrate the E-type core 2 and T-type core 3 of the core 1.

In this way, the structure in which the mounting base is provided on one side of the iron core is particularly effective when the stacked thickness of iron ○ is large, and the simple structure allows the overall size of the electromagnetic device to be miniaturized. Since the outer end of the iron 0 has a notch, as shown in FIG. 3, the width through which the magnetic flux passes becomes narrow in this part, which has the disadvantage that magnetic saturation is likely to occur.

Therefore, an object of the present invention is to provide an electromagnetic device that solves the problem of magnetic saturation and has a simpler structure.

4 and 5 show an embodiment according to the invention.

In the figure, reference numeral 11 denotes a bobbin consisting of a winding frame 12 and a holding armor 13, on which a winding wire is wound to form a coil 4. 14 is a mounting base, which has a core clamping piece 15 and a core holding piece 1.
5, a bobbin width bobbin creasing section 17 protruding upward from the central end of the iron 0 clamping piece 15, and a bobbin creasing section 17 extending outward from both sides of the bobbin creasing section 17. It consists of a short protruding bobbin contact piece 18.

Then, the iron D clamping pieces 15 of the mounting base 14 are placed on both ends of one of the laminated cores, for example, the T-shaped core 3, and the bolt through holes 19 of the core clamping pieces 15 are connected to the center end of the T-shaped core 3. The bolts 21 are passed through and fixed by aligning the bolt through holes 20 formed in the parts, and in this state, the bobbin 11 of the coil 4 is inserted into the center leg of the T-shaped core 3 and the bobbin contact pieces 18' on both sides of the center leg. , the E-type iron core 2 is inserted into the coil 4 to form the T-type iron core 2.
The bolt 2 is inserted into the bolt through hole 20 at the corner end of the E-type core 3 through the bolt through hole 19 of the core holding piece 15.
1 is fixed through the hole. In this embodiment, firstly, the mounting base is divided into two parts, and the core is fixed by passing the bolt through it so that the core is supported, so the fixation is easier and more reliable than by caulking, and moreover, there is no cutout. Since there are no narrow parts in the water passage, the electrical characteristics are also good.
Secondly, since the bobbin supporting piece 18 of the mounting base 14 is interposed between the iron core 1 and the winding frame 12 of the bobbin 11, the winding 22 wound around the bobbin 11 as shown in FIG. The inner corner of the bobbin can have a large insulation distance from the side corner of the central leg of the core 1, thereby ensuring insulation of the winding 22 at the corner of the bobbin, where insulation problems with the core 1 are likely to occur. be able to.

Further, as shown in FIG. 6, the bobbin 11 has a frame 12 formed integrally with the flange 13 and a short side 23, and a long side attached in parallel between the short sides 23. In some cases, the long side part 24 is formed by the long side part 24 to accommodate the stacking thickness of iron DI, and the bobbin parts are made common. Nearby winding 22
In such cases, the bobbin support piece 18 is particularly effective. 7 to 9 show different examples of the mounting base 14 used in the present invention, and the one in FIG. 7 shows a portion extending upward from both ends of the core holding piece 15 and extending along the core. 25, the iron DI can be fixed better.
The size of the mounting portion 16 is made the same as that of the bobbin creasing portion 17 to simplify the structure, and the mounting portion 16 of FIG.

As described above, in the electromagnetic device according to the present invention, the mounting base is divided into two parts and the iron core is fixed in the direction of lamination with bolts passing through, thereby obtaining reliable and simple fixing with good electrical characteristics, and fixing the bobbin support piece to the bobbin. By interposing it between the inner wall and the iron clamping piece, insulation of the winding can be reliably obtained.

[Brief explanation of drawings]

1 to 3 are an overall perspective view, a sectional view, and an explanatory view, respectively, showing a conventional example of an electromagnetic device, and FIGS. 4 and 5 are an exploded perspective view, an assembled sectional view, and an assembled sectional view, respectively, of an embodiment according to the present invention. Figure 6 is a partial enlarged sectional view of the different cross sections, and Figure 7
9 through 9 show different embodiments of the mounting base used in the present invention. 1..." iron core, 2...E type iron core, 3...T
Model core, 4...Coil, 11...Bobbin, 12...Winding frame, 14...Mounting base, 15...Core clamping piece, 16...Mounting Part, 17... Bobbin creasing part, 18...・Bobbin support piece. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1 Core clamping piece, a mounting part formed perpendicularly from the lower edge of the core clamping piece, a bobbin fitting part protruding from the upper end of the iron core clamping piece, and a short part protruding outward from both sides of the bobbin fitting part. The core clamping pieces of the mounting base consisting of bobbin contact pieces clamp the core from both ends in the stacking direction, pass through and fix the bolts at the core ends, and attach the coil to the core center leg and the bobbin contact pieces on both sides. An electromagnetic device characterized by a bobbin fitted and fixed.