JPS6252932B2 - - Google Patents

Description

[Detailed description of the invention] TECHNICAL FIELD This invention relates to electromagnetic devices.

Conventionally, as shown in FIGS. 1 and 2, an E-shaped core 1 and an I-shaped core 2 are provided, and a groove 6, which is formed between a central leg 3 and side legs 4, 5 of the E-shaped core 1, 7 has a coil 8 inserted together with insulating papers 9 and 10. In order to surround the inner and outer surfaces and end surfaces of the coil 8, the insulating papers 9 and 10 include an inner piece 11, an outer piece 12, an end piece 13, and end pieces 14 and 15 bent from the ends of the inner piece 11 and the outer piece 12. have. and,
Grooves 6 and 7 are provided to facilitate insertion of insulating papers 9 and 10.
Although the width of the insulating paper 9 and 10 is larger than the width of the end piece 13, since the insulating paper 9 and 10 have a corresponding stiffness,
The outer piece 12 opens and joins the inner side of the side legs 4, 5 on the open side of the grooves 6, 7. Therefore, when joining the E-type core 1 and the I-type core 2, a portion of the insulating papers 9 and 10 bites into the joint surface 16 of the two, creating a gap in the joint surface 16 and making the electrical characteristics unstable. It is.
For this reason, the end pieces 14 and 15 are stacked one on top of the other and fixed with tape or the like, but this is time-consuming and, due to carelessness, some of the insulating papers 9 and 10 or the tape may be
The troubles encountered in step 6 will not be resolved with certainty.

The present invention has been made in view of these points, and it is an object of the present invention to provide an electromagnetic device that can be easily assembled by closely adhering an E-shaped core and an I-shaped core without sandwiching insulating paper between them.

In this invention, the coil is inserted into the groove of the E-shaped core while being surrounded by insulating paper, and the insulating paper is pushed toward the center of the groove by a pressing part formed in the middle part of the side surface of the groove of the E-shaped core. The insulating paper is separated from the side surface of the open end, so that the E-type core and the I-type core are joined and fixed without sandwiching the insulating paper, and stable electrical characteristics are obtained. The structure is such that it can be manufactured easily by eliminating the trouble of temporary fixing.

A first embodiment of this invention will be explained based on FIGS. 3 and 4. Components that are the same as those described in FIGS. 1 and 2 are designated by the same reference numerals, and description thereof will be omitted (the same applies hereinafter). Grooves 6 and 7 are formed on both sides of the grooves 6 and 7 of the E-shaped core 1, that is, on the outer surface of the center leg 3 and the inner surface of the side legs 4, by forming recesses 17 located on the back side of the grooves 6 and 7. , 7, a stepped portion 18, which is a pressing portion, is formed protrudingly located at the middle portion of the side surface. Further, the width of the grooves 6 and 7 from the opening side to the stepped portion 18 is B, and the width of the bottom side including the recessed portion 17 is C.
The width dimension A of the end piece 13 that joins with the bottom of 7 is set to a value larger than B and slightly smaller than C.

In such a configuration, the coil 8 is placed in the grooves 6 and 7.
are inserted while surrounding them with insulating papers 9 and 10. At this time, the outer piece 12 and the inner piece 1 of the insulating paper 9, 10
1 means that the grooves 6, 7 are inclined toward the center of the grooves 6, 7 as they are pressed by the stepped portion 18 and move toward the I-shaped core 2.
It separates from the central leg 3 and the side legs 4 at the open end of. Therefore, when the end pieces 14 and 15 are overlapped to cover the end face of the coil 8 and the I-shaped core 2 is welded to the end face of the E-shaped core 1, a portion of the insulating paper 9 and 10 is placed between the joint surfaces 16 of the two. The department is never pinched. moreover,
Since a recess 19 is formed in the I-shaped core 2 at a portion facing the grooves 6, 7 and the central leg 3, the ends of the side legs 4, 5 and the I-shaped terminal 2 can be brought into complete contact with each other. is possible. Therefore, stable electrical characteristics can be obtained. Furthermore, there is no need to perform troublesome temporary fixing operations such as taping in order to bring the inner piece 11 and the outer piece 12 of the insulating papers 9, 10 closer to the center of the grooves 6, 7, and the production is extremely easy.

Next, a second embodiment of the present invention will be explained based on FIG. In this embodiment, the grooves 6 and 7 of the E-type core 1 are
A recess 17 located on the bottom side is formed only on one side, that is, the inner surface of the side legs 4 and 5, and a step 18 is formed in the middle part, and the depth of the recess 19 of the I-shaped core 2 is determined by insulating paper. A gap 20 is formed on the facing surfaces of the I-shaped iron core 2 and the center leg 3 with a dimension twice the thickness of the plates 9 and 10. Therefore, the bending piece 2 bent from the end of the inner piece of the insulating paper 9, 10 toward the center leg 3 side
1 and the end piece 14 bent from the end of the outer piece 12 toward the center leg 3 side are stacked together and inserted into the gap 20, so that the total length of the E-shaped core 1 and the I-shaped core 2 can be measured using insulating paper. It is possible to shorten the plate thickness by 9 or 10 mm.
Furthermore, an end piece 14 is provided between the I-shaped core 2 and the central leg 3.
Since the varnish is filled with the varnish and the refracting piece 21, it is difficult for the varnish to flow out to the outside during varnish treatment, and even a small gap is sufficiently filled with varnish, thereby suppressing the generation of whirring noise when electricity is applied.

Furthermore, as shown in FIG.
Even if a continuous piece 22 that connects one end of the inner piece 11 is inserted into the cavity 20, it is possible to bring the joining surfaces 16 into close contact. In this case, insulating paper 9,
10 can be integrally formed from one sheet, the number of parts is reduced, and the assembly work to the E-shaped core 1 is further facilitated.

Since the present invention is configured as described above, it is possible to connect the E-type core and the I-type core in close contact with each other without sandwiching a part of the insulating paper between them, thereby providing stable electrical characteristics can be obtained,
Further, it has the advantage that it can be easily assembled without the trouble of temporarily fixing insulating paper.

[Brief explanation of the drawing]

Figure 1 shows a conventional example, and is a plan view of the state before the I-type core is connected to the E-type core, Figure 2 is a plan view of the state after the combination, and Figure 3 is the first example of the present invention. Fig. 4 is a plan view showing the state before the I-shaped core is coupled to the E-shaped core, Fig. 5 is a plan view showing the state after the coupling, and Fig. 5 is a second embodiment of the present invention. FIG. 6 is a plan view showing an example in which an I-shaped core is coupled to an E-shaped core, and FIG. 6 is a plan view showing a modification thereof. 1...E-type core, 2...I-type core, 3...center leg, 4
~5...Side leg, 6~7...Groove, 8...Coil, 9~10
...Insulating paper, 11...Inner piece, 12...Outer piece, 13~
15... End piece, 18... Step part (pressing part), 20... Gap part, 22... Connection piece.

Claims (1)

[Claims] 1. An E-shaped core in which a groove with an opening at one end is formed into which a coil is inserted between the central leg and the side legs, and an I-shaped core that is joined and fixed to the end face of this E-shaped core. an insulating paper is provided in which an inner piece that covers the inner surface of the coil, an outer piece that covers the outer surface of the coil, and an end piece that covers the end surface of the coil are connected in a bendable manner and are inserted into the groove; An electromagnetic device characterized in that a pressing portion is integrally formed in a middle portion of a side surface of the groove to press the insulating paper while tilting toward the center of the groove as it goes toward the I-shaped iron core. 2. A gap is formed in the opposing surfaces of the central leg and the I-shaped core, and the bent portions of the inner and outer pieces of insulating paper are stacked on top of each other and inserted into the gap. 2. An electromagnetic device according to claim 1, characterized in that the electromagnetic device is equipped with an electromagnetic device. 3. A gap is formed in the opposing surfaces of the center leg and the I-shaped core, and one end of the inner piece of insulating paper inserted into each groove is integrally connected with a continuous piece, and this continuous piece is connected to the gap. 2. The electromagnetic device according to claim 1, wherein the electromagnetic device is inserted into a portion of the electromagnetic device.