KR100481948B1 - coil unit manufaturing of transformer - Google Patents
coil unit manufaturing of transformer Download PDFInfo
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- KR100481948B1 KR100481948B1 KR10-2002-0040953A KR20020040953A KR100481948B1 KR 100481948 B1 KR100481948 B1 KR 100481948B1 KR 20020040953 A KR20020040953 A KR 20020040953A KR 100481948 B1 KR100481948 B1 KR 100481948B1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/12—Insulating of windings
- H01F41/127—Encapsulating or impregnating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/327—Encapsulating or impregnating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F2038/003—High frequency transformer for microwave oven
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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Insulating Of Coils (AREA)
Abstract
본 발명은 트랜스포머의 코일유닛 제조방법에 관한 것으로서, 코일유닛의 코일에 접착제를 코팅하고 경화되어 코일간의 상호 결속된 다음 몰딩공정을 실시함으로써, 몰딩 과정에서 고압의 절연재가 코일유닛에 주입되더라도 코일의 형태가 휘거나 위치 이동되지 않고 안정된 상태로 성형된다. 따라서 본 발명은 코일의 휨이나 위치이동으로 인해 발생되는 절연내력의 저하나 레이어 쇼트를 근본적으로 방지하는 유용한 효과가 있다.The present invention relates to a coil unit manufacturing method of a transformer, by coating an adhesive on the coil of the coil unit and hardened to bind to each other between the coils and then performing a molding process, even if a high-pressure insulating material is injected into the coil unit during the molding process of the coil It is molded in a stable state without being bent or repositioned. Therefore, the present invention has a useful effect of fundamentally preventing the reduction of the dielectric strength or the layer short caused by the bending or positional movement of the coil.
Description
본 발명은 트랜스포머의 코일유닛 제조 방법에 관한 것으로서, 보다 상세하게는 주로 전자렌지에서 승압용으로 사용되고 있는 트랜스포머의 코일유닛 절연부를 성형하기 위한 트랜스포머의 코일유닛제조방법에 관한 것이다.The present invention relates to a method of manufacturing a coil unit of a transformer, and more particularly, to a method of manufacturing a coil unit of a transformer for molding a coil unit insulating portion of a transformer which is mainly used for boosting pressure in a microwave oven.
일반적으로 전자렌지의 트랜스포머는 마그네트론의 구동에 필요한 고전압을 출력하는 장치를 말하며, 도 1에서 나타낸 바와 같이 크게 E형 코어(E)와 I형 코어(I)사이에 코일유닛(10)이 설치되는 구조로 이루어진다. 여기서, 코일유닛(100)은 통상 2000V 이상의 고전압이 흐르기 때문에 절연재(200) 등이 사용된다. In general, a transformer of a microwave oven refers to a device for outputting a high voltage required for driving a magnetron, and as shown in FIG. 1, a coil unit 10 is installed between an E-type core E and an I-type core I. Made of structure. Here, the coil unit 100 is usually used because the insulating material 200 or the like because a high voltage of more than 2000V flows.
이러한 코일유닛(100)은 안정된 전압의 발생과 전류의 흐름을 유지하기 위하여 무엇보다도 일정하게 권선된 코일(110)의 패턴을 유지하는 것이 중요하다. 그러나 종래에는 도 2a에서와 같이 하부금형(300)의 캐비티(310)에 다수의 간극유지돌기(320)가 형성되고, 이러한 캐비티(310)에는 코일유닛(100)을 안치시킨 후 BMC 등의 절연재(200)인 몰딩물을 고압으로 유입하여 코일유닛(100)을 피복하는 과정에서, 도 2b에서와 같이 캐비티(310)로 유입되는 고압의 몰딩물에 의해 코일유닛(100)의 일부 코일(110)이 휘어지거나 위치 이동된다. 즉, 코일유닛(100)의 바깥부분에 위치한 코일(110)은 고압으로 유입되는 몰딩물의 빠른 유속에 의해 휘어지거나 위치 이동되는 바, 이와 같이 코일(110)이 휘어지거나 위치이동이 이루어지면 절연효과가 감소되고 레이어 쇼트의 발생은 불량품을 양산시키고 제품의 품질을 저하시켜 수율 저하 및 생산비용의 상승을 초래하게 된다.In order to maintain the generation of a stable voltage and the flow of current, it is important that the coil unit 100 maintain the pattern of the coil 110 that is constantly wound. However, in the related art, as shown in FIG. 2A, a plurality of gap maintaining protrusions 320 are formed in the cavity 310 of the lower mold 300, and after the coil unit 100 is placed in the cavity 310, an insulating material such as BMC is disposed. In the process of covering the coil unit 100 by introducing the molding material 200 at a high pressure, a part of the coil 110 of the coil unit 100 is formed by the high pressure molding material flowing into the cavity 310 as shown in FIG. 2B. ) Is bent or moved. That is, the coil 110 located on the outer portion of the coil unit 100 is bent or moved by the fast flow rate of the molding flowed into the high pressure bar, as described above, if the coil 110 is bent or moved, the insulation effect The reduction in the number of layers and the occurrence of layer shorts can lead to the production of defective products and the deterioration of product quality, resulting in lower yields and higher production costs.
삭제delete
한편, 도 3은 전술한 문제점을 해결하기 위하여 선 출원된 전자렌지용 고압트랜스 제조방법 및 그 장치(국내특허공개번호2001-0014645)를 도시한 것으로서, 권선된 코일(110)에 간극 유지용 보조구(G)가 설치되어 권선된 코일(110)이 휘어지거나 위치 이동되는 것을 방지하도록 되어 있다.On the other hand, Figure 3 shows a high-voltage transformer manufacturing method and apparatus (National Patent Publication No. 2001-0014645) for a microwave filed in order to solve the above-mentioned problems, the auxiliary coil for maintaining the gap in the wound coil 110 Sphere (G) is installed to prevent the coiled winding 110 is bent or moved.
그러나, 간극 유지용 보조구(G)를 이용한 방법은 코일유닛(100) 전체를 커버하지 못하므로 몰딩물이 유입되는 경우 간극 유지용 보조구(G)와 인접하지 않은 부분의 코일(110)이 여전히 휘어지거나 위치 이동된다. 즉, 고압으로 유입되는 몰드물에 의해 코일(110)이 휘어지거나 위치 이동되는 문제점을 근본적으로 해결하지 못하였다. 더욱이, 간극 유지용 보조구(G)라는 별도의 추가부품이 소요되므로 부품수 및 공정수가 증가되고 제조원가가 상승되는 등 전술한 문제점을 근본적으로 해결하지 못하였다.However, the method using the gap maintenance aid (G) does not cover the entire coil unit 100, so when the molding is introduced, the coil 110 of the portion not adjacent to the gap maintenance aid (G) is Still bent or displaced. That is, the coil 110 is not fundamentally solved by a problem that the coil 110 is bent or moved by a mold flowing at high pressure. In addition, since the additional maintenance of the auxiliary tool (G) for maintaining the gap is required, the above-mentioned problems are not fundamentally solved, such as an increase in the number of parts and processes and an increase in manufacturing cost.
본 발명의 목적은 상기한 바와 같은 문제점을 해결하기 위하여 코일을 접착제로 코팅한 상태에서 권선한 코일 유닛 상태에서 경화시킨 후 이를 금형에 넣어 몰딩함으로써, 몰딩중에 코일유닛의 코일이 휘어지거나 위치이동되지 않도록 하는 전자렌지용 트랜스포머의 코일유닛의 제조방법을 제공하는 데 있다.An object of the present invention is to cure the coil in the state of the coil unit wound in an adhesive coated state in order to solve the problems described above, and then put it into a mold and molding, so that the coil of the coil unit is not bent or moved during molding It is to provide a method of manufacturing a coil unit of a transformer for a microwave oven.
이와 같은 목적을 달성하기 위하여 본 발명은 코일이 권선된 코일유닛을 몰드금형의 캐비티에 안치하여 절연재를 피복하는 전자렌지용 트랜스포머의 코일유닛 제조방법에 있어서, 코일에 접착제를 코팅하여 코일유닛을 형성하는 코팅코일권선공정과, 절연재가 피복되기 이전에 코팅된 접착제에 코일사이가 견고하게 상호결속되는 접착제경화공정으로 이루어진다.In order to achieve the above object, the present invention is a coil unit manufacturing method of a transformer for a microwave oven in which a coil unit wound around a coil is placed in a cavity of a mold mold to cover an insulating material, wherein a coil unit is formed by coating an adhesive on the coil. It consists of a coating coil winding process, and an adhesive hardening process in which the coils are firmly bound to the coated adhesive before the insulating material is coated.
이에 따라 본 발명은 몰딩과정에서 코일의 위치가 그대로 유지되어 별도의 스페이서를 사용하지 않고도 안정된 품질의 제품을 염가로 생산할 수 있는 효과가 있다. Accordingly, the present invention has the effect that the position of the coil is maintained as it is in the molding process can be produced at a low cost of stable quality products without using a separate spacer.
이하 본 발명에 따른 전자렌지용 트랜스포머의 코일유닛 제조방법에 대한 바람직한 실시예를 첨부된 도면에 의거하여 상세하게 설명하면 다음과 같다.Hereinafter, a preferred embodiment of a coil unit manufacturing method of a microwave oven transformer according to the present invention will be described in detail with reference to the accompanying drawings.
도 4에서 나타낸 바와 같이 본 발명은 코일(610)을 권선시켜 코일유닛(600)을 형성하는 공정에서 먼저 코일(610)의 권선시에 먼저 접착제로 코팅한다. 이어서 접착제가 코팅된 코일(610)을 알콜 함침조에 통과시킨 다음 권선하며, 이때 접착제는 알콜 타입의 셀프본딩바니쉬와 같은 접착제(620)가 주로 사용된다. 이와 같이 본 발명에서는 코일(610)이 접착제(620)가 담긴 용기속을 통과한 후 권선되므로 코일(610) 사이가 접착제에 의하여 견고하게 결속된다.As shown in FIG. 4, in the process of winding the coil 610 to form the coil unit 600, the present invention is first coated with an adhesive when winding the coil 610. The adhesive coated coil 610 is then passed through an alcohol impregnation bath and then wound, wherein the adhesive is mainly an adhesive 620, such as an alcohol-type self-bonding varnish. As described above, in the present invention, since the coil 610 is wound after passing through the container containing the adhesive 620, the coil 610 is firmly bound by the adhesive.
이러한 코팅코일권선공정을 거친 코일유닛(600)은 시간이 경과함에 따라 경화된다. 즉, 알콜 타입의 셀프본딩바니쉬와 같은 접착제(620)는 일정시간 내에 알콜성분이 자연 휘발되므로 코팅된 접착제(620)가 권선되는 과정에서 자연스럽게 경화되는 것이다.The coil unit 600 which has undergone the coating coil winding process is cured as time passes. That is, the adhesive 620, such as an alcohol-type self-bonding varnish, is naturally cured in the process of winding the coated adhesive 620 because the alcohol component is volatilized within a certain time.
이어서, 접착제(620)가 경화된 코일유닛(600)을 캐비티(500)에 안치한 후, 상부금형(400)에 형성된 러너(410)를 통해 캐비티(500)로 절연재(200)인 몰딩물이 고압으로 유입된다. 즉, 도 6에서 나타낸 바와 같이 코일(610)에 코팅된 접착제(620)가 접착제 경화공정에 의해 이미 경화되어 있으므로 고압의 몰딩물이 캐비티(500)로 유입되더라도 코일유닛(600)의 코일(610)은 변형되거나 위치 이동되지 않고 몰드공정 이전의 형태를 그대로 유지하게 되는 것이다.Subsequently, the coil unit 600 cured by the adhesive 620 is placed in the cavity 500, and then a molding, which is an insulating material 200, is injected into the cavity 500 through the runner 410 formed in the upper mold 400. Flows into. That is, as shown in FIG. 6, since the adhesive 620 coated on the coil 610 is already cured by an adhesive curing process, the coil 610 of the coil unit 600 may be introduced even if a high-pressure molding is introduced into the cavity 500. ) Is not deformed or repositioned, but retains the shape before the mold process.
도 7은 본 발명의 다른 실시예를 나타낸 것으로, 접착제(620)가 코팅된 코일(610)에는 일정한 전원이 공급된다. 따라서 코일(610)은 자체 발열되므로 코일(610)에 코팅된 접착제(620)는 열 경화된다. Figure 7 shows another embodiment of the present invention, a constant power is supplied to the coil 610 coated with the adhesive 620. Therefore, since the coil 610 is self-heating, the adhesive 620 coated on the coil 610 is thermally cured.
이와 같이 접착제(620)가 경화된 코일유닛(600)은 몰딩공정에서 고압의 몰딩물이 유입되더라도 도 6을 통해 이미 설명한 바와 같이 코일(610)의 변형이나 위치이동은 발생되지 않는다. 즉, 코일(610)에 코팅된 접착제(620)가 접착제(620)경화공정에 의해 이미 경화되어 있으므로 고압의 몰딩물이 캐비티(50)로 유입되더라도 코일유닛(600)의 코일(610)은 변형되거나 위치 이동되지 않고 안정된 형태를 그대로 유지하면서 몰딩되는 것이다.As described above with reference to FIG. 6, the coil unit 600 in which the adhesive 620 is cured does not generate deformation or positional shift even when a high-pressure molding is introduced in the molding process. That is, since the adhesive 620 coated on the coil 610 is already cured by the adhesive 620 curing process, the coil 610 of the coil unit 600 is deformed even when a high-pressure molding is introduced into the cavity 50. It is molded without being moved or repositioned and maintaining a stable shape.
한편, 코일(100)의 자체발열을 위해서는 150V~480V,10A~20A의 전원을 인가하는 것이 바람직하며, 상기 범위값에 미달하는 경우에는 경화에 소요되는 시간이 연장된다. 또한 상기 범위값을 초과하는 경우에는 손상의 우려가 발생된다.On the other hand, for the self-heating of the coil 100, it is preferable to apply a power supply of 150V ~ 480V, 10A ~ 20A, when it is less than the above range value, the time required for curing is extended. Moreover, when the said range value is exceeded, a fear of damage arises.
도 8은 본 발명의 또 다른 실시예를 나타낸 것으로, 코일(610)에 코팅된 접착제(620)는 전술한 자체발열에 의한 방법외에 일반 히터등과 같은 외부가열수단을 사용하여 코팅된 코일(610)을 경화시키는 것도 가능하다. 즉 접착제(620)가 코팅된 코일유닛(600)을 몰딩공정전에 외부히터의 열을 이용하여 전열시키므로 접착제(620)가 경화되도록 한 것이다. 이때에 가열시간을 1초에서5초,온도는 100℃~150℃의 조건으로 가열경화가 가능하다Figure 8 shows another embodiment of the present invention, the adhesive 620 coated on the coil 610 is a coil 610 coated using an external heating means such as a general heater in addition to the above-described method of self-heating ) Can also be cured. That is, the adhesive 620 is cured because the coil unit 600 coated with the adhesive 620 is transferred using the heat of the external heater before the molding process. At this time, the heating time is 1 to 5 seconds and the temperature can be cured under the condition of 100 ℃ ~ 150 ℃.
따라서, 이와 같이 경화된 코일유닛(600)은 도 6에서 이미 설명한 바와 같이 고압의 몰딩물이 유입되더라도 코일(610)의 변형이나 위치이동은 발생되지 않는다.Therefore, the coil unit 600 cured as described above does not cause deformation or positional movement of the coil 610 even when a high-pressure molding is introduced as described above with reference to FIG. 6.
한편, 상술한 실시예는 본 발명의 바람직한 실시예의 일예를 설명한 것에 불과하고 본 발명의 적용범위는 이와 같은 것에 한정되는 것은 아니며 동일사상의 범주내에서 적절하게 변경 가능한 것으로, 예를 들면 접착제의 경우 알콜 타입외에 다른 타입의 접착제가 사용 가능한 것이다.On the other hand, the above-described embodiment is merely described an example of a preferred embodiment of the present invention and the scope of application of the present invention is not limited to such, and can be changed appropriately within the scope of the same thought, for example, in the case of adhesive In addition to the alcohol type, other types of adhesives may be used.
이상에서와 같이 본 발명은 코일유닛의 접착제가 경화된 후 몰드금형의 캐비티에 안치하는 것이므로, 몰딩공정에 의해 절연재가 코일유닛에 피복되는 과정에서 몰딩물이 고압으로 흐르는 과정에서 코일의 형태가 휘거나 위치 이동되지 않고 안정된 상태로 유지된다. 따라서 코일이 휘어지거나 위치이동으로 인해 발생되었던 절연내력의 저하나 레이어 쇼트를 근본적으로 방지하여 트랜스포머 제품의 불량률을 크게 감소시켜 제조원가의 절감과 제품의 품질을 향상시키는 매우 유용한 효과가 있는 것이다.As described above, the present invention is to be placed in the cavity of the mold mold after the adhesive of the coil unit is cured, the shape of the coil in the process of flowing the molding at high pressure in the process of coating the insulating material to the coil unit by the molding process It does not move or reposition itself and remains stable. Therefore, it is possible to fundamentally prevent the degradation of insulation strength or layer short caused by the bending of the coil or the position movement, thereby greatly reducing the defective rate of the transformer product, thereby reducing the manufacturing cost and improving the product quality.
도 1은 일반적인 트랜스포머를 나타낸 사시도1 is a perspective view showing a typical transformer
도 2a는 종래의 트랜스포머 코일유닛 제조방법을 나타낸 사시도Figure 2a is a perspective view showing a conventional transformer coil unit manufacturing method
도 2b는 종래의 코일유닛의 코일을 나타낸 사시도Figure 2b is a perspective view showing a coil of a conventional coil unit
도 3은 종래의 다른 트랜스포머의 코일유닛 제조방법을 나타낸 사시도 3 is a perspective view showing a coil unit manufacturing method of another conventional transformer
도 4는 본 발명의 트랜스포머의 코일유닛 제조방법을 나타낸 흐름도Figure 4 is a flow chart showing a coil unit manufacturing method of the transformer of the present invention
도 5는 본 발명의 트랜스포머 코일유닛의 제조를 위한 금형을 보인 종단면도Figure 5 is a longitudinal cross-sectional view showing a mold for the production of the transformer coil unit of the present invention.
도 6은 본 발명에 의해 제조된 트랜스포머 코일유닛을 일부를 절개한 사시도Figure 6 is a perspective view of a part of the transformer coil unit prepared by the present invention cut
도 7, 8은 본 발명의 다른 실시예를 나타낸 흐름도7 and 8 are flowcharts illustrating another embodiment of the present invention.
*도면의 주요 부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings
300 : 하부금형 400 : 상부금형300: lower mold 400: upper mold
410 : 런너 500 : 캐비티410: Runner 500: Cavity
600 : 코일유닛 610 : 코일600: coil unit 610: coil
620 : 접착제620: Adhesive
Claims (4)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2002-0040953A KR100481948B1 (en) | 2002-07-13 | 2002-07-13 | coil unit manufaturing of transformer |
| CNA021313873A CN1467763A (en) | 2002-07-13 | 2002-10-08 | Manufacturing method of transformer coil assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2002-0040953A KR100481948B1 (en) | 2002-07-13 | 2002-07-13 | coil unit manufaturing of transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20040006623A KR20040006623A (en) | 2004-01-24 |
| KR100481948B1 true KR100481948B1 (en) | 2005-04-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR10-2002-0040953A KR100481948B1 (en) | 2002-07-13 | 2002-07-13 | coil unit manufaturing of transformer |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100481948B1 (en) |
| CN (1) | CN1467763A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102210425B1 (en) * | 2020-11-06 | 2021-01-29 | 양황순 | Transformer assembly and method for assembling the same |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55117223A (en) * | 1979-03-01 | 1980-09-09 | Sumitomo Electric Ind Ltd | Coiling method of pulse transformer or the like |
| JPS60245103A (en) * | 1984-05-18 | 1985-12-04 | Mitsubishi Electric Corp | Coil fixing method of rotary transformer |
| JPS6340308A (en) * | 1986-08-05 | 1988-02-20 | Tamura Seisakusho Co Ltd | Transformer for magnetic flux balanced method |
| JPS6485551A (en) * | 1987-09-25 | 1989-03-30 | Furukawa Electric Co Ltd | Manufacture of spiral coil |
| JPH02297904A (en) * | 1989-05-12 | 1990-12-10 | Mitsubishi Electric Corp | Superconducting coil |
| JPH04162507A (en) * | 1990-10-25 | 1992-06-08 | Sony Chem Corp | Rotary transformer |
| JPH04162508A (en) * | 1990-10-25 | 1992-06-08 | Sony Chem Corp | Rotary transformer |
| JPH06290647A (en) * | 1993-03-31 | 1994-10-18 | Fujikura Ltd | Multicore parallel glued wire and its winding and laminating method, and resultant coil |
| KR200246447Y1 (en) * | 2001-06-20 | 2001-10-31 | (주)삼동 | Coil for transformer |
-
2002
- 2002-07-13 KR KR10-2002-0040953A patent/KR100481948B1/en not_active IP Right Cessation
- 2002-10-08 CN CNA021313873A patent/CN1467763A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55117223A (en) * | 1979-03-01 | 1980-09-09 | Sumitomo Electric Ind Ltd | Coiling method of pulse transformer or the like |
| JPS60245103A (en) * | 1984-05-18 | 1985-12-04 | Mitsubishi Electric Corp | Coil fixing method of rotary transformer |
| JPS6340308A (en) * | 1986-08-05 | 1988-02-20 | Tamura Seisakusho Co Ltd | Transformer for magnetic flux balanced method |
| JPS6485551A (en) * | 1987-09-25 | 1989-03-30 | Furukawa Electric Co Ltd | Manufacture of spiral coil |
| JPH02297904A (en) * | 1989-05-12 | 1990-12-10 | Mitsubishi Electric Corp | Superconducting coil |
| JPH04162507A (en) * | 1990-10-25 | 1992-06-08 | Sony Chem Corp | Rotary transformer |
| JPH04162508A (en) * | 1990-10-25 | 1992-06-08 | Sony Chem Corp | Rotary transformer |
| JPH06290647A (en) * | 1993-03-31 | 1994-10-18 | Fujikura Ltd | Multicore parallel glued wire and its winding and laminating method, and resultant coil |
| KR200246447Y1 (en) * | 2001-06-20 | 2001-10-31 | (주)삼동 | Coil for transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20040006623A (en) | 2004-01-24 |
| CN1467763A (en) | 2004-01-14 |
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