WO1994019811A1 - Coil component and method of punching core used for the coil component - Google Patents

Abstract

This invention relates to small, thin coil component and a method of punching a core used for the coil component to improve a heat radiation property and to reduce leakage. To accomplish the object described above, the coil component of this invention includes an I-shaped laminate core having tapered ends, and a pair of C-shaped laminate core having ends, the inner edges of which are beveled to match the tapered ends of the I-shaped core. The I-shaped laminate core is clamped between the C-shaped cores with its tapered ends engaged with the beveled edges.

Description

 Specification

Title of invention

 How to punch out coil parts and the iron core used for them

Technical field

 The present invention relates to a coil component such as a transformer or a choke coil used for various electronic devices, and a method of punching an iron core used for the same. It is.

Background art

 In recent years, coil components such as transformers and choke coils used in various consumer electronic devices are light, thin and small, with low loss, low heat generation, high efficiency and low leakage. Improvements in electrical properties such as stiffness are also required. In this case, it is necessary to have a structure with good productivity, and there is a need for a method of punching the iron core with good productivity and economy.

 Hereinafter, a conventional example of a conventional coil component using a transformer will be described with reference to FIGS. 26 to 31. FIG. In Fig. 26 and Fig. 27, at least a winding 3 consisting of a primary winding and a secondary winding is attached to a coil bobbin 2 having flanges 1 at both ends. After winding and inserting the E-shaped laminated iron core 4 laminated to the specified thickness into the coil bobbin 2, insert the E-shaped laminated iron core 4 into the magnetic leg end of the E-shaped laminated iron core 4. The I-shaped laminated iron cores 5 laminated to a predetermined thickness are joined together, and the joined parts are joined by welding, or the two cores 4 are welded using a metal frame or the like. , 5 were fixed.

Instead of the above configuration, as shown in Figs. 28 (a) and (b), the direction of insertion into the coil bobbin 2 of the E-shaped laminated iron core 4 depends on the insertion direction. Winding Clearance A between the outer periphery of coil bobbin 3 and coil bobbin 2 and the outer magnetic legs of E-shaped laminated iron core 4 and the center hole of coil bobbin 2 A clearance a between the center magnetic leg of the E-shaped laminated iron core 4 and the E-shaped laminated iron core 4 is provided in advance, and the coiling due to the winding tension is provided. Clearance B is required due to the deformation of Pobin 2, etc., so the winding space is reduced and the size of the transformer is reduced in size and thickness. It was an obstacle.

 Also, by providing the above clearances A and B, an air layer is formed between the winding 3 and the coil bobbin 2 and the E-shaped laminated core 4. Due to the presence of such a material, the heat dissipation was worsened, the temperature increased sharply, and vibrations were likely to occur, resulting in poor reliability.

 Furthermore, since the E-shaped laminated iron core 4 and the I-shaped laminated iron core 5 are used as the iron cores, the abutting portions of the two iron cores 4 and 5 cause the flow of magnetic flux. The abutting portion functions as a magnetic gap, so that leakage of magnetic flux at the abutting portion increases, resulting in lower leakage. Had become difficult.

 In addition, since the clearance is large as described above, in order to make the most effective use of the winding space, the winding 3 may be used. Aligned winding was required, which required time and labor for the winding work, and also required an expensive winding device.

In addition, as shown in Fig. 29, when the insertion angle of the E-shaped laminated iron core 4 with respect to the coil pobin 2 is deviated, as shown in Fig. 30. If the outside diameter of the winding 3 becomes too large, the corners of the magnetic legs of the E-shaped laminating core 4 when inserting the E-shaped laminating core 4 Damages the outer surface of the winding 3, resulting in poor insulation and poor safety. Had become

 For this reason, the outer diameter of the winding 3 is often large as shown in Fig. 31.Therefore, after winding the winding 3, the winding 3 In order to adjust the outer diameter of the wire, pressing is applied from both sides of the winding 3 using a winding shaping jig 6, but this winding shaping process is required. This causes cracking and deformation of the core boss 2, and further causes secondary failures such as disconnection of the winding 3 and deterioration of the insulation of the winding 3, which is large in terms of reliability. Ο was a challenge

 An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a coil component which can be light and thin and which has excellent electrical characteristics. is there

Disclosure of invention

 In order to solve the above-mentioned problems, a coil component according to the present invention has a triangular shape having tapered surfaces on both ends at both ends as a central magnetic leg incorporated in the center of the winding. Use an I-shaped laminated iron core with a section, and use both sides as magnetic legs at both ends to match the tapered surface of one of the triangles ^ of the above-mentioned I-shaped laminated iron core. Using a pair of C-shaped laminated iron cores with tapered surfaces, this pair of C-shaped laminated cores are wound around the I-shaped laminated core. The outer surface of the C-shaped laminated iron core is pressed against the inner surface of the C-shaped laminated iron core.

 With the above configuration, the clearance between the windings and the iron core can be minimized, the air space can be reduced, and the electrical characteristics can be reduced. It is also an attempt to improve the quality.

Brief description of the drawings

FIG. 1 is a diagram of a transformer which is an embodiment of the coil component of the present invention. FIG. 2 is an exploded perspective view, FIG. 2 is a perspective view of the same transformer, and FIGS. 3 (a) and 3 (b) are cross-sectional views for explaining the same transparency. 4 (a) to 4 (d) are perspective views of the insulation sheet used for the transformer, FIG. 5 is a cross-sectional view showing the same during the assembly of the transformer, and FIG. The figure is a cross-sectional view for explaining the relationship between the insulation sheet and the windings, which is the main part of the transformer. Fig. 7 is the iron core that is the main part of the transformer. FIG. 8 is a cross-sectional view of a state where the I-type and C-type laminated cores, which are the main parts, are combined. Fig. 9 is a cross-sectional view of another embodiment of the butt portion between the I-shaped and C-shaped laminated iron cores, which are the main parts, and Fig. 10 is the butt that is the main part. Break after welding FIG. 11 is a cross-sectional view of another embodiment of a butt portion which is the same main portion of the present invention. FIG. 12 is a sectional view of another embodiment of a butt portion which is the same main portion of the present invention. FIG. 13 is a cross-sectional view of the butted portion, which is the main part of the present invention, after welding, FIG. 14 is an exploded perspective view of another embodiment of the same transance, and FIG. Fig. 16 is a cross-sectional view of another embodiment of the same transformer, Fig. 16 is a cross-sectional view of another embodiment of the same trans- former, and Fig. 17 is a main portion of the same transformer. Fig. 18 is a cross-sectional view for explaining the process of pressurizing and assembling the transformer. Fig. 19 (a) and (b) are cross-sectional views of the same core. Fig. 20 is a perspective view of another embodiment of the same transformer, Fig. 21 is a perspective view of another embodiment of the same transformer, and Fig. 21 is a perspective view of another embodiment of the same transformer. Exploded perspective view, Fig. 22 is the same 23 (a) to 23 (d) are cross-sectional views for explaining the pressurizing and assembling processes of another embodiment of the transformer. FIGS. 24 (a) to (d) are perspective views of each embodiment of the iron core, which is a main part of the transformer, and FIG. 25 is another perspective view of the same transformer. FIG. 26 is a perspective view of the embodiment, and FIG. FIG. 27 is an exploded perspective view of the transformer, FIG. 27 is a perspective view of the same transformer, FIGS. 28 (a) and (W are cross-sectional views of the same transformer, and FIG. A cross-sectional view illustrating a state where a coil bobbin is inserted into the E-shaped laminated iron core, which is the main part of the transformer. Fig. 30 shows the main part of the transformer. Sectional view explaining the state of inserting the coil bobbin into the E-shaped laminating iron core. Fig. 31 shows the pressurizing and assembling process of the transformer. It is a perspective view

BEST MODE FOR CARRYING OUT THE INVENTION

 (Example 1)

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6 and a representative example of a coil component will be described with reference to FIGS. 1 to 3 (b). This is explained using a trans- lation as an example. Numeral 7 denotes a coil bobbin having flanges 8 at both ends. The coil bobbin 7 has at least a winding 9 composed of a primary winding and a secondary winding. It has been. The start of winding of the winding 9 and the end of the intermediate tap are connected to the terminal 10 provided on the flange 8 of the coil bobbin 7.

 In the center hole 11 of the coil bobbin 7, an I-shaped laminated iron core 12 laminated to a predetermined thickness is incorporated as a central magnetic leg. At both ends of the I-shaped laminated iron core 12, triangular portions 14 having tapered surfaces 13 of 45 degrees on both sides are formed.

Also, C-shaped laminated iron cores 15 laminated to a predetermined thickness from both sides of the coil bobbin 7 are incorporated as outer magnetic legs. This C-shaped laminated iron core 15 has tapered surfaces 13 at both ends that match the tapered surfaces 13 of the triangular shaped portion 14 of the I-shaped laminated iron core 12 above. a The C-shaped laminated iron core 15 is assembled from both sides of the I-shaped laminated iron core 12 to form the sun-shape. A closed magnetic circuit iron core is formed.

 Further, when assembling the C-shaped laminated core 15 from both sides of the coil bobbin 7, the inside of the C-shaped laminated core 15 is required. An insulation sheet 16 is arranged on the side surface to ensure insulation between the C-shaped laminated iron core 15 and the winding 9.

 The C-shaped laminated iron core 15 is combined with the I-shaped laminated iron core 12 from both sides of the coil bobbin 7. By pressing the outer surface of the winding 9 wound around the rupobin 7, the taper surfaces 13 a at both ends are formed in a triangular shape of the I-shaped laminated iron core 12. It is dimensioned to match the tapered surface 13 of the part 14, and the C-shaped laminate on both sides with respect to this I-shaped laminated iron core 12. With the cores 15 pressed together and pressed against each other, the butted portions are welded together, or assembled using metal fittings or the like to complete the assembly.

 The clearance between the winding 9 and the iron core having the above configuration will be described with reference to FIGS. 3 (a) and 3 (b), and the center hole of the coil bobbin 7 will be described. The dimensions of 1 1 are set to minimize the clearance C with respect to the I-shaped laminated core 12, and the height of the flange 8 of the coil bobbin 7 H is the date formed when the tapered surface 13a of the C-shaped laminated core 15 and the tapered surface 13 of the I-shaped laminated core 12 coincide. The dimensions are set to be the same as the dimensions of the window holes in the closed magnetic circuit iron core.

Therefore, the winding 9 may be wound by a non-aligned winding, and the winding may exceed the height h of the flange 8 of the coil bobbin 7. Even if it has an outer diameter, the inner surface that contacts the winding 9 of the C-shaped laminated iron core 15 The outer periphery of the winding 9 wound higher than the flange 8 of the coil bobbin 7 is pressed and adjusted, and the coil bobbin is also formed by the winding tension. It is attached while forcing the deformation of the pin 7 and assembled so as to match the I-shaped laminated iron core 12.

 With the above configuration, even if there is an air gap between the windings as the winding 9, the pressing force of the C-shaped laminated iron core 15 does not affect the winding 9. This gap can be eliminated, and as a result, there is only a gap that is only clear clearance C of coil bobbin 7 and I-shaped laminated iron core 12. As a result, the Joule heat generated in the winding 9 is efficiently radiated to the outside through the iron core.

 For this heat dissipation, an insulating layer is formed on the outer peripheral surface of the I-shaped laminated iron core 12 by coating, applying, etc. a synthetic resin. If the coil bobbin 7 is used instead, the clearance C can be further eliminated, and the effect can be further obtained.

 Further, in the above embodiment, an example is shown in which the insulating sheet 16 is interposed between the inner surface of the C-shaped laminated iron core 15 and the winding 9. If there is no paris on the inner surface of the net iron core 15, this insulating sheet 16 can be omitted, and the heat dissipation can be further improved.

Also, as shown in Figs. 4 (a) to (d), the insulation sheet 16 is provided with bent pieces 17 on the four sides of the U-shape and the rectangular body so as to face each other. Use two of them, one for-and the other two bent in the opposite direction, a simple sheet, or a thicker one. As the material, a material having excellent heat conductivity and insulating properties, such as paper, non-woven fabric, and polyester film, can be used. Of this, 5 As shown in the figure, a sponge-like insulation sheet 16 such as a non-woven fabric is used for the mouth, which can be made of polyester finolem or paper. In comparison, when the C-shaped laminated iron core 15 is assembled, the winding 9 is pressed more resiliently, and as shown in FIG. 6, the insulating sheet 16 and the winding 9 are pressed. It is possible to improve heat dissipation by improving the heat dissipation, and to minimize the stress on the winding 9.

 In addition, the effect can be obtained by applying an insulating material to the inner surface of the C-shaped laminated iron core 15 instead of the insulating sheet 16 and coating it. It is.

 In addition, the I-shaped laminated iron core 12 and the C-shaped laminated iron core 15 have a tapered surface whose abutment surface is 45 degrees in the direction of the magnetic flux flow. , 13a, even if a magnetic gap is formed here, it is bent at a right angle to the magnetic flux to the outer magnetic legs by the C-shaped laminated iron core 15. The area of the butted portion is approximately 1.4 times the area of the conventional butted portion, and the leakage area is increased due to the increase of the area of the butted portion. This can greatly reduce jiflex. In addition, in the above-mentioned embodiment, the teno. Although the surfaces 13 and 13a are shown as having an angle of 45 degrees, they need not necessarily be at 45 degrees, but may be at various angles. it can .

 Further, in the above embodiment, the trans- lation is shown as an example, but a similar configuration can be applied to a choke coil or the like, and the same effect can be obtained. O

Fig. 7 shows the method of punching out the I-type laminated core 12 and the C-shaped laminated core 15. The pair of C-shaped laminated cores 15 Position vertically and opposite to the tape width B, One of the C-shaped laminated iron cores 15 is shifted vertically to the hoop width B, and the inner side of the C-shaped laminated iron cores 15 facing each other is shifted. In the meantime, the I-shaped laminated iron core 12 is positioned obliquely, and the iron core hoop 18 is punched out continuously.

 Hereinafter, Embodiments 2 to 5 will be described, but the same parts as those in Embodiment 1 will be denoted by the same reference numerals and description thereof will be omitted.

 (Example 2)

 Fig. 8 shows the tapered surface 13 of the triangular shaped part 14 at both ends of the I-shaped laminated iron core 12 for the purpose of improving the characteristics of the C-shaped laminated iron core 15. When the tapered surface 13a is matched, the I-shaped laminated iron core 12 protrudes outward from the butted portion of the C-shaped laminated iron core 15. The triangular shaped portion of the laminated iron core 12 The projecting part 19 at the tip of 14 is welded to form a sun-shaped closed magnetic circuit to make a coil part.

 Also, as shown in Fig. 9, the protruding portion 19a of the I-shaped laminated iron core 12 may have a trapezoidal shape to improve the weldability.

 As shown in Fig. 10 by welding the protruding parts 19, 19a of the I-shaped laminated iron core 12 of the shape shown in Figs. The welding depth L of the portion 19b can be made to be less than half of the welding depth of the one without forming the projection 19, and The magnetic effects such as the obstruction of the magnetic flux flow to the closed magnetic circuit in the shape of a letter are minimized, and the eddy current loss of the protrusion 19b is reduced, resulting in lower loss and lower leakage. It will be possible to achieve

 (Example 3)

Fig. 11 shows an I-shaped laminate for the purpose of improving weldability and properties. When the tapered surface 13a of the triangular shaped part 14 at both ends of the core core 12 matches the tapered surface 13a of the core 15 The tip of the I-shaped laminated iron core 12 is located inward from the butted part 20 of the core iron 15. At this time, the I-shaped laminated core 12 is sandwiched between the C-shaped laminated core 15 and the welded portion 21 is the first as shown in Fig. 13. By fixing the butt portion 20 in Fig. 1 by welding and welding, the I-shaped laminated iron core 12 is not deteriorated by welding at the two-point joint, so It is possible to construct a closed magnetic circuit in a shape, and it is possible to make the coil part with low loss, easy welding work, and excellent productivity.

 In addition, a high grade iron core, for example, a directional gay steel plate is used for the I-shaped laminated core 12, and a non-directional core for the C-shaped laminated core 15. When steel sheet is used, the C-shaped laminated iron core 15 also has the same iron loss as that using a directional gay steel sheet, and the leakage flux is C. Since the non-oriented gay element steel is used for the shaped laminating iron core 15, it can be reduced, and the C-shaped laminated iron core 15 is made of a non-directional gay element steel plate. Can be easily welded.

 As shown in Fig. 12, the shape of the butted portion 20 is such that a straight portion is provided at the tip of the tapered surface 13a of the C-shaped laminated iron core 15, and the flat butted portion 2 is formed. It may be welded as 0a as shown in Fig.13.

 (Example 4)

Next, Fig. 14 aims to improve the characteristics and the durability of the press die of the iron core to be used. The magnetic legs of a pair of C-shaped laminated iron cores 15 are shown in FIG. When the width dimension is a, a C-shaped laminate with inner corners 22 provided with arcs 50 to aZ5 (hereinafter referred to as R) 23 is provided. If the winding 9 fits inside the C-shaped laminated core 15 with the core 15, the R 23 of the inner corner 22 is large and large. Of course, just one place is fine.

 By constructing such a magnetic circuit, the magnetic flux density is higher, the magnetic flux easily flows to the inner corner 22 of the C-shaped laminated iron core 15, and the leakage is reduced. Excitation current, iron loss, and leakage flux are reduced due to the difficulty, efficiency is improved, and accordingly, the temperature rise is small and the size is reduced. For this purpose, iron cores with a large amount of molybdenum may be used, annealing may be performed on the iron core, and magnetic shields and short rings may be attached. You do not need to do this. In addition, the durability of the press die of the iron core to be used is also improved.

 Fig. 15 and Fig. 16 show that the same effect can be obtained by installing a taper 24 on the inner corner 22 of the C-shaped laminated iron core 15. Can be obtained.

 (Example 5)

 Next, FIGS. 17 to 20 will be described.

FIG. 17 is intended to improve the assemblability and the quality. The winding 9 is laminated at a predetermined thickness as a center magnetic leg on the winding 9, and at least one line on the center line in the width direction is provided. The fitting piece 25 protruding on one side is squeezed out at the force point, and the adjacent I-shaped laminate is fitted to the concave part 26 of the fitting piece 25 of the adjacent iron core 12 to fit the I-shaped laminate. The core iron core 12 is assembled as an I-shaped block iron core 27, and is laminated at a predetermined thickness at the corner 28 and the effective magnetic path width. Similarly, the fitting piece 25 described in the above-mentioned I-shaped block iron core 27 is provided at the outer position of the fitting piece 2 of the adjacent C-shaped laminated iron core 15. 5 recessed part 2 6 and C-shaped laminated iron core 1 5 Is used as the C-shaped block iron core 29, and as the outer magnetic legs, a sun-shaped closed magnetic circuit core is constructed. The position of the mating piece 25 is outside the effective magnetic path width, that is, the magnetic flux density of the I-type block iron core 27 and the C-type block and the iron core 29 is extremely high. It is important that the low point is attained without deteriorating the characteristics.

 Fig. 18 is a cross-sectional view of the assembling process of pressurizing the C-type block iron core 29, because the winding 9 is pressurized on the inner surface of the C-type block iron core 29. It is important that the surface in contact with the winding 9 of the C-shaped block iron core 29 is particularly flat. Therefore, the winding 9 does not necessarily have to be an aligned winding, and if the winding 9 is designed to fit within the winding space of the coil bobbin 7. Even if the outside diameter of the winding 9 is large, it can be assembled without damaging the winding 9 because the inside surface of the C-shaped block iron core 29 is pressurized even if the outside diameter of the winding 9 is large. By blocking the core, vibration is suppressed and the quality is improved.

 FIGS. 19 (a) and (b) are cross-sectional views of the mating piece 25, which are in a semi-open state such as a triangle in (a) and a circular in (b). If so, the same effect can be obtained.

 Fig. 20 shows a completed product using the I-type block iron core 27 and the C-type block iron core 29 as a transformer.

Fig. 21 shows the purpose of improving the assemblability and the quality. The I-shaped laminated iron core 12 is laminated and inserted into the center hole 11 of the coil bobbin 7. The inner surface that is in contact with the windings 9 that have the taper surfaces 13a at both ends of the foot that has the taper surfaces 13a that match the taper surfaces 13 of the I-shaped laminated iron core 12 is fixed to the fixing member. Winding a pair of C-shaped laminated iron cores 15 that have been soft-fixed and blocked in 30. Windings 9 Built-in I-shaped laminated iron cores 12 from the top surface. At the end of the face 13, the matching point 31 of the C-shaped laminating iron core 15 is welded to complete the product as shown in Fig. 25. According to this method, since the soft fixation block is used, the accuracy of the laminated end faces of the respective laminating iron cores is not required so much, and the assembling process shown in Fig. 22 is not required. The taper surfaces 13 and 13a are brought into close contact with each other due to the pressurization, so that the characteristics can be improved and vibration can be eliminated. In addition, since each laminating iron core is pressed into a para-para, it is possible to increase the rotation speed of the brace with a simple press die. Therefore, it will be cost-effective and inexpensive.

As shown in Fig. 23 (a) to Fig. 24 (d), the method of soft fixing with the fixing member 30 is limited to only the inner end faces of a pair of C-shaped laminated iron cores 15. It suffices if the taper surface 13a is not a part other than the tapered surface 13a, and the I-type laminated iron core 12 can be similarly made into a soft fixed block. For the laminated iron core 15, it is effective to fix the outer end face only because the tapered face 13 a is open because the tapered face 13 a is open. As the material of the fixing member 30, a non-magnetic metal thin foil product such as an adhesive tape made of a polyester film, aluminum or the like is provided with an adhesive material. The same effect can be obtained by extruding the molding resin or by melting the molding resin, or by using adhesives such as rubber or acrylic. _C

Industrial applicability

As described above, since the coil component of the present invention is configured, it is possible to reduce the clearance between the winding and the coil bobbin and the iron core. Therefore, the formation of an air layer between them is minimized, and the space factor of the windings is improved, and the heat dissipation is also significantly improved. 0 In particular, the outer periphery of the winding is pressed with a C-shaped laminated iron core, which further reduces the air space and minimizes the occurrence of snarling and other vibrations. And can be done. In addition, since the I-type laminated iron core and the 'C-shaped laminated iron core are butted using a tapered surface, the occurrence of leakage cage flux is also significant. It is possible to achieve a sufficient effect even in the configuration of electronic devices by recent high-density mounting.

 In addition, the windings are not damaged during assembly, and the insulation is not degraded and the reliability is high.

 In addition, the tip of the triangular part of the I-shaped laminated iron core is located outside or inward of the butted part of the C-shaped laminated iron core and welded. In addition to improvements in characteristics such as reduction of eddy current loss due to welding, low loss, high efficiency, and low leakage flux, Furthermore, even if the material of the I-type and C-type laminated iron cores is changed to achieve low loss and low leakage flux, the welding workability is improved. It can improve the quality and stabilize the quality, resulting in excellent productivity.

 Also, the R and teno of the inner corner of the C-shaped laminated iron core with high magnetic flux density. With the installation of the magnetic flux, the magnetic flux is more likely to flow and the leakage is reduced, so the loss is reduced, the efficiency is increased, and the leakage flux is reduced. The use of iron cores with a high content of Ga or annealing of iron cores can be achieved by reducing the temperature, lowering the temperature, and enabling downsizing. It is unnecessary, has low cost and is excellent in economy, and also improves the durability of the press mold.

In addition, in the case of the I-type block iron and the C-type block iron, the vibration can be reduced and the space factor of the windings can be improved. o

 Also, when the I-type block iron and the C-type block iron are soft-fixed with a soft-fixing material, they do not become loose when assembling the core. Since the winding is pressurized on the entire inner end face of the C-shaped laminated iron core, the winding is not damaged, and the winding space is maintained. In addition to being able to reduce the size and thickness of the core, it is possible to take a large amount of The required accuracy is obtained by the pressurization during welding due to the flexibility of the core, and the iron cores are securely joined one by one, resulting in poor characteristics and poor core performance. Lock defect is eliminated.

 In addition, it has many advantages, such as increasing the rotation speed of the press and improving the productivity of the iron core.

Claims

Range of request I-type laminating iron core with a triangular-shaped part at both ends that protects both teno surfaces is used as the center magnetic leg incorporated in the center of the winding. A pair of C-shaped laminar arms with tapered surfaces at both ends that match the tapered surface of the triangular-shaped portion of the iron core at both ends Using a core, press the pair of c-shaped cores against the I-shaped laminating core and press the outer surface of the winding with the inner surface of the C-shaped laminating core. A coil part characterized in that it is joined as described above. In claim 1, it is characterized in that a coil wound around at least a coil bobbin having flanges at both ends is used. Ill part □  DD A coil according to claim 1, characterized in that an insulation sheet is interposed between the inner surface of the C-shaped laminated iron core and the outer surface of the winding. Part Π αΠ ο In Claim 1, when a pair of C-shaped laminated iron cores is combined with an I-shaped laminated iron core, the outer side of the butted portion of the C-shaped laminated iron cores A coil part characterized by forming a sun-shaped closed magnetic circuit by welding the tip of a triangular-shaped part of an I-shaped laminated iron core that protrudes from the core. In claim 1, a pair of C-shaped laminated iron cores are used. When combined with an I-shaped laminating core, the tip of the I-shaped laminating iron core is positioned inward from the butted portion of the C-shaped laminating iron core, and the c-shaped laminating core is positioned. A coil component characterized in that the butted portion of a net core is welded to form a closed magnetic circuit in the shape of a sun. 6 In the scope of the request for Tl, in paragraph 5, I-type laminated iron core and C-type la 1 type α-11  Minute blue iron The core is made of a different material, and the butted part of the C-shaped laminated iron core is welded to form a sun-shaped closed magnetic circuit. Parts. 7 In claim 1, when the width of the magnetic legs on both sides of a pair of C-shaped laminated iron cores is a, the inner corner has an a 50 to a / 5 key. A coil part characterized by incorporating a C-shaped laminated iron core with a roll (R).  8. A coil according to claim 1, characterized in that a taper is provided on one of the inner corners of the magnetic legs on both sides of the pair of C-shaped laminated iron cores. Part D αD  9. In claim 1, in the I-shaped laminated iron core, at least one point along the center line in the width direction shall have a C-shaped laminated iron core. In this case, the fitting pieces protruding from each side are squeezed out to a position outside the effective magnetic path width at a part of the corner, and the fitting pieces of each laminating iron core are placed adjacent to each other. The coil section is characterized in that each of the laminating iron cores is configured to be fitted into the recess of the mating piece of the laminating iron core to block the laminating iron core.  an  0. In claim 1, the inner ends of the pair of C-shaped laminated iron cores are soft-fixed with a fixing member to form a block, and the I-shaped laminated iron core is formed. The outer surface of the winding is pressed against the inner surface of the C-shaped laminated iron core. In section 1 of the scope of the claim, the C-shaped laminated iron core and the end faces other than the tapered surface of the laminated iron core are softened with a fixing member. A coil part characterized by being fixed and blocked. An I-shaped iron core with both ends formed in a substantially triangular shape, and an approximately triangular tapered surface at both ends of the I-shaped iron core placed at both ends of the I-shaped iron core at both ends of the magnetic legs. Matched taper surfaces are provided—with a pair of C-shaped iron cores, the pair of C-shaped iron cores are positioned vertically and opposite to each other with respect to the hoop width. Then, shift one of the C-shaped iron cores vertically with respect to the hoop width, and position the I-shaped iron core obliquely between the insides of the opposed C-shaped iron cores. A method for punching out iron cores for coil parts, which is characterized in that core hoops are punched out continuously.