JPH04177711A - Electromagnetic equipment - Google Patents

Abstract

PURPOSE:To abate the noise by a method wherein relief trenches of the bonding agent interposed in a gap between end surfaces of both iron cores are formed oppositely to the laminated surfaces of iron cores respectively inserted from both ends into the inner peripheral surface of a cylindrical part of a coil bobbin, i.e., the insertion part of the core. CONSTITUTION:The bonding agent 44 opposing to the laminated layer surface of the central leg core parts 34 of the iron cores 28, 28 respectively inserted from both ends of the iron core insertion parts 32 of a coil bobbin 30 is spread out of the end surface by relief trenches 36 while the other bonding agent 44 interposed in a gap 43 between the end surfaces of the central leg part 34 of both iron cores 28, 28 is spread outward by the end surface pressure of the central leg core part 34 partly led into the upper and lower part of the leg core part 34 simultaneously along both sides relief trenches 36. At this time, a recessing past 38 is internally formed continuously to the trenches 36 on the outer surface of both flange parts 37, 37 of the cylindrical part 33 of the coil bobbin 30 so that the bonding agent 44 may be led not only into the central leg core part 34 of the iron cores 28, 28 but also into the part from the base of the leg core part 34 to the part between the coils 27 and the side leg core parts 42. Through these procedures, the vibration between the laminated layers of iron cores 28 is restrained to abate the noise.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to electromagnetic equipment such as a discharge lamp ballast, for example, and an electromagnetic equipment that combines a coil bobbin forming a coil and a laminated iron core. Regarding.

(Prior Art) In a conventional electromagnetic device such as a discharge lamp ballast of this type, as shown in FIGS. At the same time, it has a rectangular cylindrical part 7 whose inner side is opened at both ends 11 and serves as an insertion part 6 into which the central leg 6 part 5 of the E-shaped core 4, 4 is inserted.
This cylindrical part 7 has a structure in which a collar part 8 is formed at both ends of the coil winding part 3 on the outer periphery thereof. Then, a coil is formed by fixing the starting wire of the wire to the terminal of the coil bobbin 1, winding a predetermined amount of the wire around the coil winding part 3, and fixing the ending wire to the terminal. It is covered with insulating tape. Insert the center legs 6 5 of the cores 4, 4 from both end openings of the core insertion portion 6 of the coil bobbin 1, and insert the cores 4, 4 facing the insulating tape 9 on the outer peripheral surface of the coil 2.
After fitting the leg core portions 10 on both sides, a structure is adopted in which the cores 4, 4 and the coil 2 are fixed with a case body 11 and the outer periphery is covered. 2. In order to prevent noise caused by vibrations of the cores 4.4 and to stabilize the electrical characteristics, the central abdominal center portions 5 of the cores 4, 4 are inserted into the core insertion portion 6 of the coil bobbin 1 from both ends. An adhesive 13 is interposed in the gap 12 between the end faces.

(Problems to be Solved by the Invention) In the electromagnetic equipment having the conventional structure described above, in order to prevent noise caused by vibration of the iron cores 4 and 71 and to stabilize the electrical characteristics, It is desirable that the adhesive interposed in the gap 12 be in sufficient quantity, and that the quantity distribution and arrangement be uniform.

Therefore, as shown in FIG. 9, an escape recess for the adhesive 13 is formed in the core insertion portion 6 of the cylindrical portion 7 of the coil bobbin 1-, in a portion facing the upper or lower surface of the central abdominal center portion 5.5 of the cores 4, 4. 14 is known. However, in the structure in which this escape recess 14 is formed, the adhesive 13 flows out along the escape recess 14 because it is formed facing the two sides or the lower surface of the center central portion 5.5 of the iron cores 4, 4. There was a problem in that the liquid leaked from the flange 8 of the coil bobbin 1 to the outside. Further, the adhesive 13 is applied to the escape recess 14 of the coil bobbin 1.
As shown in FIG. 11, the distribution of the adhesive 13 only reaches a position near the base of the central ventral core 5, suppressing the vibration of the end surface of the central ventral core 5, but the adhesive 13 flows along the core 4.
/I could not be expected to prevent vibrations in other parts, and was insufficient as a vibration-proof structure.

Furthermore, in order to suppress the vibration of iron cores and coils,
Resin impregnation methods are also commonly used, but in electromagnetic devices impregnated with resin, the material cost is high, the resin takes a long time to harden, and there are problems with workability, leading to increased costs.

The present invention has been made in view of the problems mentioned above, and the amount of adhesive that is interposed in the gap formed between the central ventral parts of a laminated core is extended between the central ventral part and the side leg joints. An object of the present invention is to provide an electromagnetic device that can reduce noise by making the distribution and arrangement of objects uniform.

[Structure of the invention]

(Means for Solving the Problems) An electromagnetic device of the present invention includes a laminated core and a coil attached to the core, and a coil bobbin forming the coil has an outer peripheral surface as a coil winding portion and a coil winding portion thereof. It has a cylindrical part whose inside is opened at both ends and serves as an insertion part into which the core is inserted, and on the inner circumferential surface of the cylindrical part, both cores are inserted from both ends facing the laminated surface of the core. An adhesive relief groove is formed in the gap between the end faces.

(Function) In the electromagnetic device of the present invention, the inner circumferential surface of the cylindrical portion, which serves as an insertion portion into which the iron core inside the coil winding portion formed on the outer circumferential surface of the coil bobbin is inserted, is provided with the inner circumferential surface of the cylindrical portion inserted from both ends. Since an escape groove for the adhesive is formed in the gap between the end faces of both cores, facing the laminated surface of the core, the adhesive flows along the escape groove, and the center of the core of the electromagnetic equipment body is Since the adhesive flows from the abdominal core to the side leg joints and is introduced facing the laminated surface of the core, vibration between the laminated layers of the core is suppressed.

(Embodiment) The configuration of an embodiment of the electromagnetic device of the present invention is shown in FIGS. 1 to 3.
Figure 6 will be explained.

Reference numeral 21 designates a case body with a substantially inverted U-shaped case member 22 whose lower surface is open, and a bottom plate 23 which is crimped to one edge of the lower surface of this case member 22. The bottom plate 23 has a longer longitudinal length than the case member 22, and both ends thereof are formed into fixing pieces 25 having holes 24 for attachment.

26 is the main body of the electromagnetic equipment, with the coil 27 and the iron core 28°2
8, and this coil 27 is connected to a coil bobbin 30.
is wrapped around. This coil bobbin 30 has a cylindrical part 33 with a coil winding part 31 on the outer circumferential surface and an insertion part 32 opened at both ends on the inside thereof into which the iron core 28, 28 is inserted. An adhesive 44 is applied to the inner circumferential surface of the cores 28, 28, which are inserted from both ends, and which are interposed in the gap 43 between the mutually opposing end surfaces of the center central portions 34 of the cores 28, 28, facing the laminated surfaces of the cores 28, 28 inserted from both ends. An escape groove 3G is formed. The width of the relief recess 36 is approximately one third of the height of the insertion portion 32. Additionally, collar portions 37 and 37 are formed at both ends of the cylindrical portion 33 of this coil bobbin 30. A recess 38 is formed on the inner side of the outer surface of the flange 37 and continues to the relief groove 36 .

Further, each of the collar portions 37 of the coil bobbin 30 is formed with a terminal attachment portion 39, and each of the terminal attachment portions 39 is provided with a terminal 40 for connecting the lead wire of the coil 27 and an external conducting wire.

Further, the iron cores 28 and 28 are formed of E-shaped iron cores, and have a central circumferential portion 34 inserted into the insertion portion 32 of the coil bobbin 30 and an insulating material 4 covering the coil 27 on the outer periphery of the coil 27.
1, and the central circumferential portion 34 of both iron cores 28,28 is connected to the coil bobbin 3.
When inserted into the insertion portion 32 of No. 0, the distal end surfaces are opposed to each other with a gap 43 interposed therebetween, and an adhesive 44 is interposed in the gap 43.

Next, the operation of this embodiment will be explained.

The center circumferential center portions 34 of the cores 28 and 28 inserted from both ends of the core insertion portion 32 of the coil bobbin 30 are connected to both cores 28 by the escape grooves 36 of the adhesive 44 facing the laminated surface.
．． The adhesive 44 interposed in the gap 43 between the end faces of the central circumferential center part 34 of 28 is spread outward from the end face by pressing the end face of the central circumferential center part 34, and a part of it is introduced into the upper and lower surfaces of the medium heat leg center part 34. At the same time, it is introduced along the escape recesses 36 on both sides. Then, the cylindrical portion 33 of the small bobbin 30
The relief groove 3 is formed on the inner side of the outer surface of the flange portion 37 at both ends.
A concave portion 38 is formed continuously from the core 28.
4 to between the coil 27 and the side leg 6 portion 42.

Then, the electromagnetic device main body 26 assembled in this way
is stored and held in the case member 22, and in this state, the bottom plate 23 is crimped and coupled to the 11 portion between the lower surfaces of the case member 22, thereby storing and holding the electromagnetic device main body 26 in the cylindrical case body 2I.

Further, as shown in FIG. 4, the four portions 38 formed continuously with the relief grooves 36 of the insertion portion 32 on both end flanges 37.37 of the coil bobbin 30 are not limited to the inside but are formed up to the edges of the outside Alternatively, as shown in FIG. 5, a concave portion 38 is formed up to the edge of the collar portion 37.37, and the outer edge side of the four portions 38 is cut out. I14 connects not only the central circumferential portion 34 of the iron core 28, 28 but also the coil 27 and the side leg 6 portion 4 from the base of the central circumferential portion 34.
2 to allow the flow to flow more easily between the coil 27 and the iron core 2.
It is also possible to enhance the vibration suppression effect of 8.28.

Further, in the above embodiment, the case body 21 is the case member 22.
Although it is formed by crimping the base plate 23 and the bottom plate 23, it is also possible to have a structure in which it is previously formed into a cylindrical shape.

〔Effect of the invention〕

According to the present invention, the inner circumferential surface of the cylindrical portion serving as the insertion portion into which the iron core of the coil bobbin is inserted is provided in the gap between the end faces of the two iron cores, facing the laminated surfaces of the iron cores inserted from both ends. Since we have formed an escape groove for the adhesive to be applied, the adhesive is introduced along this escape groove and introduced from the center circumference of the core toward the side leg 6, and also on the end face and both side faces of the core. Since the adhesive is introduced facing the laminated surface, the adhesive suppresses vibration between the laminated core layers and fixes the core inside the cylindrical portion.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a coil bobbin of an electromagnetic device showing an embodiment of the present invention, Fig. 2 is a perspective view of the same electromagnetic device, Fig. 3 is an exploded perspective view of the same, and Figs. 4 and 5 are different from each other. A perspective view of a coil bobbin of an electromagnetic device showing another embodiment of the present invention, FIG. 6 is a cross-sectional plan view of FIG. 1, FIG. 7 is an enlarged cross-sectional plan view of a part of the same, and FIGS. 8 and 9 are FIG. 10 is a perspective view of a coil bobbin of a different conventional electromagnetic device, FIG. 10 is a cross-sectional plan view of the same, and FIG. 11 is an enlarged cross-sectional plan view of a part of the same. 26...Electromagnetic equipment body, 27...Coil, 28...Iron core, 30...Coil bobbin, 31...Coil winding part, 32
...Insertion part, 33...Cylindrical part, 36...Escape groove, 44
··glue. 2'+,'n

Claims (1)

[Claims] (1) Consisting of a laminated core and a coil attached to the core, a coil bobbin forming the coil has an outer peripheral surface as a coil winding part and an insertion part opened at both ends on the inside into which the core is inserted. The cylindrical part has a cylindrical part, and the inner circumferential surface of the cylindrical part has adhesive escape recesses interposed in the gap between the end faces of both cores, facing the laminated surfaces of the cores inserted from both ends. An electromagnetic device characterized by the formation of grooves.