JPS63136607A - Electromagnetic apparatus - Google Patents

Abstract

PURPOSE:To about both end corners of a T-shaped core on the steps formed at the ends of the side legs of a C-shaped core for positioning the T-shaped core without any gap by forming escaping grooves disposed at the outside of the side legs of C-or E-shaped core from both end corners of the T-shaped core continued to the steps of the C-shaped core. CONSTITUTION:A coil 15 is mounted at the center leg 16 of a T-shaped core 13. The leg 16 and a coil 15 are disposed inside a C-shaped core 12 and associated by hitting to press-fit the core 13. In this case, the core 13 is press-fitted by matching both side ends 13a of the core 13 to the end inner surface 11a of the side leg 11 of the core 12 until both end corners 19 of the core 12 are contacted with the steps 18 formed at the ends of the side leg 11 of the core 12. Since the roundness of the corner 19 and the roundness of the corner 20a of an escaping groove 20 are displaced and not interfered, the steps 81 and the corner 19 are not effectively abutted on each other without forming a gap therebetween even if they are coincident in size or not coincident.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to electromagnetic equipment such as ballasts for discharge lamps.

[Conventional technology]

A conventional electromagnetic device in which an E-shaped core and a T-shaped core are combined by press-fitting is known from Japanese Patent Publication No. 16524/1983. As shown in FIG. 5, in this prior art, the tip inner surface 2a of the side leg 2 of the E-shaped core 1 and both side tip surfaces 3a of the T-shaped core 3 which are pressed between these inner surfaces 2a are mutually tapered. The T-shaped core 3 is fixed to the inside of the E-shaped core 1 by tapping and press-fitting them together in the direction of the arrow in FIG.
It is a configuration that forms a. Then, adjusting the width a of the gap 4,
In other words, the characteristics are adjusted by adjusting the degree to which the T-shaped core 3 is hammered. However, in such conventional technology, the width adjustment of the gap 4 is 0.0
It is troublesome because high accuracy on the order of 1aa is required.

Therefore, an electromagnetic device has been provided that eliminates the need for air gap adjustment. This is shown in FIG. 6, in which 5 is a C-shaped core, and 6 is a T-shaped core press-fitted inside the C-shaped core 5. A stepped portion 8 is formed on the inner surface of the tip end of the side leg 7 of the C-shaped core 5, and the T-shaped core 6 has corner portions 9 at both ends.
is press-fitted until it abuts on the stepped portion 8, and the resulting positioning action regulates the width a of the gap 10 between the two iron cores 5.6 to a predetermined value.

(Problems to be Solved by the Invention) However, although the side leg 7 has a stepped portion 8 for positioning the T-shaped core 6 when it is press-fitted, the dimensions of the gap 10 tend to vary due to the following reasons. There was an opening ceremony.

That is, each core 1.2 is formed by stacking core plates punched from hoop materials by press working, but the corners of the press die always have a roundness commonly called a radius. Therefore, as shown macroscopically in FIG. 7, a radius r is inevitably formed in the stepped portion 8 of the C-shaped core 5 and in both end corners 9 of the T-shaped core 6, depending on the roundness of the press die. However, not only can it not be guaranteed that these radiuses r are exactly the same, but also the manner in which the press dies wear out differs from one another. If the size of the radius r between the stepped portion 8 and the corner portion 9 does not match accurately, when the C-shaped core 5 and the T-shaped core 6 are combined, the stepped portion 8 as shown in FIG. The corner portion 9 and the corner portion 9 do not come into contact with each other, and an extremely small gap is formed between them. That is, the width a of the void 10 is increased by this clearance.
It varies.

Such a variation in the width dimension of the void 1o is such that even if the above-mentioned gap is extremely small, for example, about 0.0511111, the width a of the void 10 itself is 0.2 to 0.4.
Since it is about tm, for this void 10, it is 25%~
It is extremely large at 12.5%, and has a very large influence on the characteristics of electrical equipment.

[Means for solving problems]

The present invention comprises a C-shaped or E-shaped iron core having a pair of side legs, and a T-shaped iron core combined with this iron core, and the tip surfaces of both sides of the T-shaped iron core are aligned with the inner surface of the tip of the side legs. The T-shaped core is press-fitted and fixed inside the C-shaped or E-shaped core, and the tip surface of the center leg of the T-shaped core and the T-shaped core center leg of the C-shaped or E-shaped core are fixed. Applicable to electromagnetic equipment that is assembled with a gap between the end face and the opposing face.

In the present invention, a stepped portion is formed on the inner surface of the tip end of each of the side legs, and the corner portions at both ends of the T-shaped core are in contact with each other. It is characterized by a relief groove located on the outer surface side.

[Effect]

According to the present invention, relief grooves are provided on the side legs of the C-shaped or E-shaped core, in series with the stepped portions for positioning the T-shaped core, and located on the outside of the side legs with respect to both end corners of the T-shaped core. By separating the radius formed in the escape groove and the radius formed at both end corners of the T-shaped iron core, interference between them can be eliminated. As a result, regardless of the size of each radius mentioned above, T
The corner portions at both ends of the shaped iron core and the stepped portion can be brought into contact with each other without any gaps.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

As shown in FIG. 1, the core structure of an electric ta equipment as a ballast for a discharge lamp includes a C-shaped core 12 having a pair of side legs 11, and a T-shaped core 12 combined with this core 12, as shown in FIG. A shaped iron core 13 is provided. Each core 12, 13 is formed by laminating a large number of core plates. Each core plate is obtained by punching out the same silicon steel hoop material using a press machine, or by punching out mutually different hoop materials using a press machine. These two cores 12, 13 form a coil installation space 14. The coil 15 housed in this space 14 is attached to the central leg 1'6 of the T-shaped core 13. The end surface of the central leg 16 and the C-shaped iron core 12
A gap 17 is provided between the center leg 16 and the opposing surface 12a. The width A of the void 17 is 0.2
It is about 0.4 tm. In addition, the coil arrangement space 1
The width B of the central leg 16 is the same as the width C of the side leg 11 facing this, and the width ll1D of the central leg 16 is set to be twice the widths B and C. Along with this, the width E of the tip of the side leg 11
is smaller than the width C of the portion facing the coil arrangement space 14, and a stepped portion 18 is formed at the inner boundary portion thereof. The T-shaped iron core 13 has both end surfaces 13a.
are pressed into alignment with the inner surface 11a of the distal end portion of the side leg 11, and both end corner portions 19 are positioned by abutting against the stepped portion 18. With this positioning, the width A of 117 in the above
is regulated to a predetermined size. moreover,
On the distal end side of the side leg 11, there is a relief 112 that is connected to the stepped portion 18 and is located closer to the outer surface of the side leg 11 than the corner portion 19.
0 is formed. This relief groove 20 has a corner portion 20
This is provided in order to eliminate interference between the corner portion 19 of the T-shaped iron core 13 and the corner portion 19 of the T-shaped iron core 13.

To assemble the core structure with the above configuration, first, the T-shaped core 1
The coil 15 is attached to the central leg 16 of No. 3.

Next, this T-shaped core 13 is pressed in the direction of the arrow in FIG.
It is placed inside the shaped iron core 12 and assembled. In this case, the T-shaped core 13 is arranged such that its both side end surfaces 13a are aligned with the inner surface 11a of the end portion of the side leg 11 of the C-shaped core 12, and the T-shaped core 13 is
is press-fitted until the corner portions 19 at both ends of the C-shaped core 12 come into contact with the stepped portions 18 formed at the tips of the side legs 11 of the C-shaped iron core 12.

In this press-fitting, the radius of the corner 19 and the radius 7 of the corner 20a of the relief groove 20 are out of position and do not interfere with each other, so even if the sizes of both radiuses are the same,
Also, even if they do not match, the step portion 18 and the corner portion 19
and are securely brought into contact without forming a gap between them due to the size of the radius.

Therefore, the positioning of the T-shaped core 13 becomes accurate, and the
Variation in the width A of the gap 17 formed between the surface 12a of the T-shaped core 12 and the end surface of the central leg 16 of the T-shaped core 13 is reduced. Therefore, there is no need to adjust the width of the gap 17, and an iron core structure with high gap accuracy can be easily formed.

Although the above embodiment is constructed as described above, the present invention is also applicable to electromagnetic equipment having a core structure assembled with an E-shaped core 31 and a T-shaped core 13 as shown in FIG. can.

In addition, in carrying out the present invention, the specific structure, shape, position, etc. of the E-type or E-type core, side legs, T-type core, steps, clearance grooves, voids, etc. shall not be changed unless it goes against the gist of the invention. Of course, the present invention is not limited to the above-mentioned embodiments, and can be implemented in various ways.

〔Effect of the invention〕

According to the present invention, the gist of which is the structure described in the claims above, the step portion for positioning the T-shaped core is provided on the side leg of the E-type or E-shaped core, and an escape groove that continues to the step portion is provided. By doing so, regardless of the size of the 7-rule of the escape groove and the 7-rules of the both end corners of the T-shaped core, both end corners of the T-shaped core and the E-shaped or stepped portions of the side legs of the E-shaped core can be The T-shaped core can be accurately positioned by making them contact each other without any gaps, which reduces the variation in the gap width between the two cores, resulting in island-quality electric itl.
equipment can be provided.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention, FIG. 1 is a plan view of the assembled C-shaped core and T-shaped core, FIG. 2 is an enlarged view of 1 [all in FIG. FIG. 3 is a plan view of the C-shaped core. FIG. 4 is a plan view showing another embodiment using an E-shaped core and a T-shaped core. FIG. 5 is a plan view showing a conventional example, FIGS. 6 and 7 show other conventional examples, FIG. 6 is a plan view, and FIG.
FIG. 11... Side leg, 11a... Inner surface of the tip of the side leg, 12
...C-shaped core, 12a...surface, 13...T-shaped core, 13a...both end surfaces of T-shaped core, 16...center leg, 17...gap, 18... Step part, 19...corner part, 20...relief groove. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 To02 Figure 11a lla z Figure 3 Figure 4r! 4

Claims (1)

[Claims] A C-shaped or E-shaped iron core having a pair of side legs and a T-shaped iron core combined with this iron core are provided. The core is press-fitted into the inside of the C-type or E-type core and fixed, and the end surface of the center leg of the T-type core is opposed to the end surface of the T-type core center leg of the C-type or E-type core. In an electromagnetic device that is assembled with a gap between the side legs, a stepped portion is formed on the inner surface of the tip end of each of the side legs, and the corner portions at both ends of the T-shaped core are in contact with each other. An electromagnetic device characterized in that an escape groove is formed closer to the outer surface of the side leg than the corner.