JP6383916B2 - Manufacturing method of differential transformer - Google Patents

Manufacturing method of differential transformer Download PDF

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JP6383916B2
JP6383916B2 JP2014216097A JP2014216097A JP6383916B2 JP 6383916 B2 JP6383916 B2 JP 6383916B2 JP 2014216097 A JP2014216097 A JP 2014216097A JP 2014216097 A JP2014216097 A JP 2014216097A JP 6383916 B2 JP6383916 B2 JP 6383916B2
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resin
cylindrical bobbin
outer periphery
winding
mold
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康文 原
康文 原
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Tamagawa Seiki Co Ltd
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Description

本発明は、円筒状ボビンの外周に樹脂モールドを形成する差動変圧器の製造方法に関する。   The present invention relates to a method for manufacturing a differential transformer in which a resin mold is formed on the outer periphery of a cylindrical bobbin.

従来用いられていたこの種の差動変圧器としては、例えば下記の特許文献１等に示されている構成を挙げることができる。すなわち、差動変圧器は、外周に巻線が施された円筒状ボビンを有している。円筒状ボビンの外周には、巻線を固定するように樹脂モールドが形成されている。円筒状ボビンは、円筒状ボビンの外周を囲む筒状の外部ケースに挿入されている。円筒状ボビンの内部にはプローブが挿入される。プローブが進退されることで巻線からの出力が変化される。   As this type of differential transformer that has been conventionally used, for example, a configuration shown in the following Patent Document 1 can be exemplified. That is, the differential transformer has a cylindrical bobbin with a winding on the outer periphery. A resin mold is formed on the outer periphery of the cylindrical bobbin so as to fix the winding. The cylindrical bobbin is inserted into a cylindrical outer case that surrounds the outer periphery of the cylindrical bobbin. A probe is inserted into the cylindrical bobbin. The output from the winding is changed by moving the probe back and forth.

このような差動変圧器は、以下のような方法で製造されている。すなわち、従来の差動変圧器の製造方法は、外周に巻線を施した円筒状ボビンを外部ケースに挿入した後に、円筒状ボビンを挿入した外部ケースの開口部から外部ケースの内部にポッティングにより樹脂を流し込み、外部ケースと円筒状ボビンとの間で樹脂モールドを形成している。   Such a differential transformer is manufactured by the following method. That is, the conventional method for manufacturing a differential transformer is to insert a cylindrical bobbin having a winding on the outer periphery into the outer case, and then potting from the opening of the outer case into which the cylindrical bobbin is inserted into the outer case. Resin is poured to form a resin mold between the outer case and the cylindrical bobbin.

特開２００８−３００７９０号公報Japanese Patent Laid-Open No. 2008-300790

上記のような従来の差動変圧器の製造方法では、円筒状ボビンを挿入した外部ケースの開口部から外部ケースの内部にポッティングにより樹脂を流し込み、外部ケースと円筒状ボビンとの間で樹脂モールドを形成している。このような製造方法では、例えばエポキシ樹脂等の流動性が極めて少ない樹脂を用いることができない。   In the conventional differential transformer manufacturing method as described above, resin is poured into the outer case from the opening of the outer case where the cylindrical bobbin is inserted, and a resin mold is formed between the outer case and the cylindrical bobbin. Is forming. In such a manufacturing method, it is not possible to use a resin having extremely low fluidity, such as an epoxy resin.

本発明は、上記のような課題を解決するためになされたものであり、その目的は、流動性が極めて少ない樹脂を用いて樹脂モールドを形成することができる差動変圧器の製造方法を提供することである。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for manufacturing a differential transformer capable of forming a resin mold using a resin having extremely low fluidity. It is to be.

本発明に係る差動変圧器の製造方法は、円筒状ボビンの外周に巻線を施すこと、円筒状ボビンの外周に巻線を施した後に、巻線の外周に樹脂を盛ること、巻線の外周に樹脂を盛った後に、円筒状ボビンを割型の内部空隙に配置して、樹脂を固化させることで円筒状ボビンの外周に巻線を固定する樹脂モールドを形成すること、及び樹脂モールドを形成した後に、割型を分割して円筒状ボビンを割型から取り外し、該円筒状ボビンを外部ケースに挿入することを含む。   The method for manufacturing a differential transformer according to the present invention includes winding a coil on the outer periphery of a cylindrical bobbin, applying a coil on the outer periphery of the cylindrical bobbin, and then depositing resin on the outer periphery of the coil, A resin mold for fixing the winding to the outer periphery of the cylindrical bobbin by placing the cylindrical bobbin in the inner space of the split mold and solidifying the resin Is formed, the split mold is divided, the cylindrical bobbin is removed from the split mold, and the cylindrical bobbin is inserted into the outer case.

本発明の差動変圧器の製造方法によれば、巻線の外周に樹脂を盛った後に、円筒状ボビンを割型の内部空隙に配置して、樹脂を固化させることで円筒状ボビンの外周に巻線を固定する樹脂モールドを形成するので、流動性が極めて少ない樹脂を用いて樹脂モールドを形成することができる。   According to the method for manufacturing a differential transformer of the present invention, after placing resin on the outer periphery of the winding, the cylindrical bobbin is disposed in the split-type internal gap, and the resin is solidified to solidify the outer periphery of the cylindrical bobbin. Since the resin mold for fixing the winding wire is formed, the resin mold can be formed using a resin having extremely low fluidity.

本発明の実施の形態による差動変圧器の製造方法を示す説明図である。It is explanatory drawing which shows the manufacturing method of the differential transformer by embodiment of this invention.

以下、本発明を実施するための形態について、図面を参照して説明する。
図１は、本発明の実施の形態による差動変圧器の製造方法を示す説明図である。本実施の形態の差動変圧器の製造方法は、図１の（ａ）〜（ｄ）に示す第１〜第４工程を含んでいる。まず、図１の（ａ）に示すように、円筒状ボビン１の外周に巻線２が施される。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram showing a method for manufacturing a differential transformer according to an embodiment of the present invention. The manufacturing method of the differential transformer of this Embodiment includes the 1st-4th process shown to (a)-(d) of FIG. First, as shown in FIG. 1A, the winding 2 is applied to the outer periphery of the cylindrical bobbin 1.

円筒状ボビン１の外周に巻線を施した後に、図１の（ｂ）に示すように、巻線２の外周に樹脂３を盛る。樹脂３としては、流動性が極めて少ない樹脂（例えばエポキシ樹脂等）が用いられる。円筒状ボビン１の軸方向両端部には、円筒状ボビン１と同軸に配置されるとともに円筒状ボビン１よりも大径な端板１０が取り付けられている。樹脂３は、円筒状ボビン１の軸方向に沿う端板１０間の空間を埋めるように、巻線２の外周に盛られる。すなわち、巻線２の外周に盛られた樹脂３の外面が端板１０の外面と同一面を構成するように、巻線２の外周に樹脂３が盛られる。   After winding the outer periphery of the cylindrical bobbin 1, the resin 3 is placed on the outer periphery of the winding 2 as shown in FIG. As the resin 3, a resin having extremely low fluidity (for example, an epoxy resin) is used. End plates 10 that are arranged coaxially with the cylindrical bobbin 1 and have a larger diameter than the cylindrical bobbin 1 are attached to both ends in the axial direction of the cylindrical bobbin 1. The resin 3 is deposited on the outer periphery of the winding 2 so as to fill a space between the end plates 10 along the axial direction of the cylindrical bobbin 1. That is, the resin 3 is stacked on the outer periphery of the winding 2 such that the outer surface of the resin 3 stacked on the outer periphery of the winding 2 forms the same surface as the outer surface of the end plate 10.

巻線２の外周に樹脂３を盛った後に、図１の（ｃ）に示すように、円筒状ボビン１を割型４の内部空隙４０に配置して、樹脂３を固化させることで円筒状ボビン１の外周に巻線２を固定する樹脂モールド５を形成する。割型４とは、分割可能な型であり、複数の型材４１が組み合わされたものである。図示しないが、型材４１の凹部に円筒状ボビン１を配置した後に、他の型材４１を組み合わせることで、円筒状ボビン１を割型４の内部空隙４０に配置することができる。端板１０は、円筒状ボビン１の外周と内部空隙４０の壁面４０ａとの間に樹脂３が存在できる空間を確保するように、円筒状ボビン１が内部空隙４０に配置された際に内部空隙４０の壁面４０ａに当接される。   After the resin 3 is deposited on the outer periphery of the winding 2, as shown in FIG. 1C, the cylindrical bobbin 1 is disposed in the inner space 40 of the split mold 4, and the resin 3 is solidified to form a cylindrical shape. A resin mold 5 for fixing the winding 2 is formed on the outer periphery of the bobbin 1. The split mold 4 is a separable mold and is a combination of a plurality of mold materials 41. Although not shown, the cylindrical bobbin 1 can be disposed in the internal space 40 of the split mold 4 by combining the other mold material 41 after the cylindrical bobbin 1 is disposed in the recess of the mold material 41. The end plate 10 has an internal gap when the cylindrical bobbin 1 is disposed in the internal gap 40 so as to ensure a space where the resin 3 can exist between the outer periphery of the cylindrical bobbin 1 and the wall surface 40 a of the internal gap 40. 40 abuts against the wall surface 40a.

樹脂モールド５が形成された後に、割型４が分割されて円筒状ボビン１が割型４から取り外される。そして、図１の（ｄ）に示すように、樹脂モールド５が形成された円筒状ボビン１が外部ケース６に挿入される。   After the resin mold 5 is formed, the split mold 4 is divided and the cylindrical bobbin 1 is removed from the split mold 4. Then, as shown in FIG. 1D, the cylindrical bobbin 1 on which the resin mold 5 is formed is inserted into the outer case 6.

このような差動変圧器の製造方法では、巻線２の外周に樹脂３を盛った後に、円筒状ボビン１を割型４の内部空隙４０に配置して、樹脂３を固化させることで円筒状ボビン１の外周に巻線２を固定する樹脂モールド５を形成するので、流動性が極めて少ない樹脂を用いて樹脂モールド５を形成することができる。   In such a manufacturing method of the differential transformer, after the resin 3 is stacked on the outer periphery of the winding 2, the cylindrical bobbin 1 is disposed in the internal space 40 of the split mold 4, and the resin 3 is solidified to form a cylinder. Since the resin mold 5 for fixing the winding 2 is formed on the outer periphery of the cylindrical bobbin 1, the resin mold 5 can be formed using a resin having extremely low fluidity.

また、円筒状ボビン１の軸方向に沿う端板１０間の空間を埋めるように、巻線２の外周に樹脂３が盛られるので、樹脂３を盛る量及び位置を容易に特定することができ、作業性を向上させることができる。   Further, since the resin 3 is deposited on the outer periphery of the winding 2 so as to fill the space between the end plates 10 along the axial direction of the cylindrical bobbin 1, the amount and position of the resin 3 can be easily specified. Workability can be improved.

１ 円筒状ボビン
１０ 端板
２ 巻線
３ 樹脂
４ 割型
４０ 内部空隙
５ 樹脂モールド
６ 外部ケース DESCRIPTION OF SYMBOLS 1 Cylindrical bobbin 10 End plate 2 Winding 3 Resin 4 Split type 40 Internal space 5 Resin mold 6 External case

Claims (3)

円筒状ボビンの外周に巻線を施すこと、
前記円筒状ボビンの外周に前記巻線を施した後に、前記巻線の外周に樹脂を盛ること、
前記巻線の外周に前記樹脂を盛った後に、前記円筒状ボビンを割型の内部空隙に配置して、前記樹脂を固化させることで前記円筒状ボビンの外周に前記巻線を固定する樹脂モールドを形成すること、及び
前記樹脂モールドを形成した後に、前記割型を分割して前記円筒状ボビンを前記割型から取り外し、該円筒状ボビンを外部ケースに挿入すること
を含むことを特徴とする差動変圧器の製造方法。 Winding the outer periphery of the cylindrical bobbin;
After applying the winding to the outer periphery of the cylindrical bobbin, depositing resin on the outer periphery of the winding;
Resin mold for fixing the winding on the outer periphery of the cylindrical bobbin by placing the cylindrical bobbin in a split mold internal space after the resin is deposited on the outer periphery of the winding and solidifying the resin And after forming the resin mold, the split mold is divided, the cylindrical bobbin is removed from the split mold, and the cylindrical bobbin is inserted into an outer case. A method for manufacturing a differential transformer. 前記円筒状ボビンの軸方向両端部には、前記円筒状ボビンと同軸に配置されるとともに前記円筒状ボビンよりも大径な端板が取り付けられており、
前記樹脂は、前記円筒状ボビンの軸方向に沿う前記端板間の空間を埋めるように、前記巻線の外周に盛られる
ことを特徴とする請求項１記載の差動変圧器の製造方法。 At both ends in the axial direction of the cylindrical bobbin, end plates that are arranged coaxially with the cylindrical bobbin and have a larger diameter than the cylindrical bobbin are attached.
The method for manufacturing a differential transformer according to claim 1, wherein the resin is deposited on an outer periphery of the winding so as to fill a space between the end plates along the axial direction of the cylindrical bobbin. 前記樹脂は、エポキシ樹脂であることを特徴とする請求項１又は２に記載の差動変圧器の製造方法。   The method for manufacturing a differential transformer according to claim 1, wherein the resin is an epoxy resin.
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JPS5814580Y2 (en) * 1978-06-13 1983-03-23 株式会社東芝 electromagnetic coil
JPS6438517U (en) * 1987-08-31 1989-03-08
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JP3760328B2 (en) * 1997-10-16 2006-03-29 三明電機株式会社 solenoid
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JP2000252150A (en) * 1999-02-25 2000-09-14 Fuji Elelctrochem Co Ltd Manufacture of sealed coil
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JP2006317283A (en) * 2005-05-12 2006-11-24 Matsushita Electric Works Ltd Detection part for position sensor and position sensor using the same
JP4925807B2 (en) * 2006-12-14 2012-05-09 スミダコーポレーション株式会社 Manufacturing method of sealing coil component and antenna coil component
JP5002774B2 (en) * 2007-06-04 2012-08-15 多摩川精機株式会社 Bobbin structure of differential transformer
JP5289506B2 (en) * 2011-05-23 2013-09-11 ヒラヰ電計機株式會社 Split type current transformer and coil insulation unit constituting the same
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