JP2749323B2 - Molded coil for magnetic levitation train - Google Patents
Molded coil for magnetic levitation trainInfo
- Publication number
- JP2749323B2 JP2749323B2 JP63124138A JP12413888A JP2749323B2 JP 2749323 B2 JP2749323 B2 JP 2749323B2 JP 63124138 A JP63124138 A JP 63124138A JP 12413888 A JP12413888 A JP 12413888A JP 2749323 B2 JP2749323 B2 JP 2749323B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic levitation
- coil
- levitation train
- molded coil
- hollow filler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Manufacture Of Motors, Generators (AREA)
- Insulating Of Coils (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は磁気浮上列車用モールドコイルに関するもの
である。Description: TECHNICAL FIELD The present invention relates to a molded coil for a magnetic levitation train.
例えば超高速磁気浮上列車の推進コイルや浮上コイル
など地上に設置されるコイルは、風雪や塵埃さらには太
陽の直射を受けるなど苛酷な環境条件下で使用される。
また、推進コイルでは移動磁界を発生させるために数kV
〜数十kVの高電圧が印加される。そのため推進コイルな
どは特開昭52−53265号公報等に記載されているよう
に、コイル導体の上にマイカや芳香族ポリアミド紙、エ
ポキシレジン等からなる主絶縁層を形成した後、SMC
（シート・モールデイングコンパウンド）などによる耐
候性のモールド層が設けられるか、特開昭56−134906号
公報に記載されているように、コイル導体の周囲に主絶
縁層と耐候性モールド層を兼ねた無機質粉充填エポキシ
レジンなどの注型によるモールド層が設けられるなど所
謂モールドコイルとして製作されていた。For example, coils installed on the ground, such as a propulsion coil and a levitation coil of an ultra-high-speed magnetic levitation train, are used under severe environmental conditions such as being subjected to wind, snow, dust and direct sunlight.
In addition, the propulsion coil requires several kV to generate a moving magnetic field.
A high voltage of up to several tens kV is applied. Therefore, as described in JP-A-52-53265, the propulsion coil and the like are formed with a main insulating layer made of mica, aromatic polyamide paper, epoxy resin, etc.
(A sheet molding compound) or the like, or a weather-resistant mold layer is provided around the coil conductor as described in JP-A-56-134906. It has been manufactured as a so-called molded coil in which a mold layer is provided by casting such as an epoxy resin filled with an inorganic powder.
上記従来技術は主絶縁層内、特に導体近傍にボイド、
剥離が生じると低い印加電圧からそのボイド、剥離が生
じた部分で放電（部分放電）が発生し、遂には絶縁破壊
に至るなどコイル性能を致命的に損う懸念があつた。磁
気浮上列車の推進コイルは、列車の走行区間全線にわた
つて敷設する必要があるため、大量のコイルが必要であ
り、推進コイルの構造あるいは製造方法は経済的で、か
つ量産性にすぐれたものでなければならない。この点従
来技術の欠点は種々の処理あるいは吟味した材料の選
定、工程の管理の実施など技術的には解決可能であつた
が、構造の複雑化、工数の増加を招き、量産性，経済性
が損われるなど新たな問題が生じた。The above-mentioned prior art is based on voids in the main insulating layer, especially near the conductor,
When peeling occurs, a low applied voltage generates a discharge (partial discharge) in the void and the portion where the peeling occurs, and finally there is a concern that the coil performance may be fatally impaired, for example, resulting in dielectric breakdown. Propulsion coils for maglev trains need to be laid over the entire running section of the train, so a large number of coils are required, and the structure or manufacturing method of the propulsion coil is economical and excellent in mass productivity. Must. In this respect, the disadvantages of the prior art were technically resolvable, such as selecting various processed or examined materials and conducting process management. However, the structure was complicated and the number of man-hours was increased. A new problem has arisen, such as loss of quality.
本発明はこれに鑑みなされたもので、その目的とする
ところは、信頼性が高く、かつ量産性に優れたこの種の
磁気浮上列車用モールドコイルを提供するにある。The present invention has been made in view of the above, and an object of the present invention is to provide a mold coil for a magnetic levitation train of this type which has high reliability and excellent mass productivity.
すなわち本発明は、コイル導体が所定の絶縁スペーサ
を介して型内に浮かして設置され、そしてその周囲がレ
ジンにてモールドされている磁気浮上列車用モールドコ
イルにおいて、前記レジン内に、内部に独立空間を有す
る絶縁性の中空フイラーと短繊維とが混合充填されてい
るように形成し所期の目的を達成するようにしたもので
ある。That is, the present invention relates to a magnetic levitation train molded coil in which a coil conductor is installed floating in a mold via a predetermined insulating spacer, and the periphery thereof is molded with a resin. An insulating hollow filler having a space and a short fiber are formed so as to be mixed and filled to achieve an intended purpose.
また、この場合レジン内に充填される中空フイラーの
粒径を0.1mm以下のものとなし、またその中空部内に、
電気的負性ガス，高熱伝導ガス，大気圧以上のガスの何
れかを封入するようになし、また中空フイラーの材質を
ガラスバルーン，シラスバルーンあるいはアルミナバル
ーンのいずれかとしたものである。また、短繊維として
は、ガラス繊維，アラミド繊維あるいは延伸ポリエチレ
ン繊維のいずれかとしたものである。In this case, the particle size of the hollow filler filled in the resin is set to 0.1 mm or less, and in the hollow portion,
Any one of an electrically negative gas, a high thermal conductive gas, and a gas having a pressure higher than the atmospheric pressure is sealed therein, and the material of the hollow filler is any one of a glass balloon, a shirasu balloon and an alumina balloon. The short fibers are glass fibers, aramid fibers or drawn polyethylene fibers.
すなわちこのように形成された磁気浮上列車用モール
ドコイルであると、コイル導体をモールドしているレジ
ン内に、内部に独立空間を有する中空フイラーが充填さ
れていることから、レジンの見掛け上の誘電率が小さく
なって、欠陥の発生が許容でき、絶縁的に信頼性の高い
磁気浮上列車用モールドコイルとすることができ、さら
にこの場合モールドしているレジンの内部にはさらにガ
ラス繊維などの短繊維が充填されていることから、この
短繊維の充填により前記中空フイラーをモールドレジン
内にほどよく分散させることができ、さらに全体均一的
に誘電率を小さくすることができ、絶縁的にさらに信頼
性の高いものとすることができるのである。すなわち前
記中空フイラーをモールドレジン内に混入すると、比重
の違いからレジンの硬化過程で中空フイラーが浮上し易
く、レジンの上方部に中空フイラーが集まり、レジン上
方部がフイラーリッチになる傾向にあるが、この短繊維
の混入はこの中空フイラーの浮上を抑制，すなわち中空
フイラーの片寄りを抑制し、モールドレジン内に中空フ
イラーを分散させることができ、したがって中空フイラ
ー分散のための特殊な工程を経ることはなく量産性に優
れたものとすることができる。In other words, in the case of the molded coil for a magnetic levitation train formed in this way, the resin in which the coil conductor is molded is filled with a hollow filler having an independent space inside, so that the apparent dielectric The ratio is small, the occurrence of defects can be tolerated, and it is possible to obtain a molded coil for a magnetic levitation train that is highly reliable in terms of insulation. Since the fibers are filled, the filling of the short fibers makes it possible to disperse the hollow filler moderately in the mold resin, and furthermore, it is possible to uniformly reduce the dielectric constant as a whole, thereby further improving the insulation and reliability. It is possible to have high quality. That is, when the hollow filler is mixed into the mold resin, the hollow filler is likely to float during the curing process of the resin due to a difference in specific gravity, the hollow fillers gather at the upper part of the resin, and the upper part of the resin tends to become rich. However, the incorporation of the short fibers suppresses the floating of the hollow filler, that is, the bias of the hollow filler is suppressed, and the hollow filler can be dispersed in the mold resin. Therefore, a special process for dispersing the hollow filler is performed. It can be excellent in mass productivity without any problem.
以下、図示した実施例に基づいて本発明を説明する。
第１図から第３図には本発明の一実施例が示されてい
る。コイル導体１を所定の絶縁スペーサを用いて型内に
浮かして設置し、その周囲を充填材入りレジン２でモー
ルドしてなるモールドコイルにおいて、本実施例では充
填材を、その内部に独立空間を有する絶縁性の中空フイ
ラー３および短繊維13とした。このようにすることによ
り充填材入りレジン２の見掛けの誘電率が小さくなつ
て、信頼性が高く、量産性にすぐれることを可能とした
モールドコイルを得ることができる。Hereinafter, the present invention will be described based on the illustrated embodiments.
1 to 3 show one embodiment of the present invention. In a molded coil in which the coil conductor 1 is floated and set in a mold using a predetermined insulating spacer and the periphery thereof is molded with a resin 2 containing a filler, in the present embodiment, the filler is provided in the inside thereof, and an independent space is provided therein. The insulating hollow filler 3 and the short fibers 13 are provided. By doing so, the apparent dielectric constant of the resin 2 containing the filler is reduced, and a molded coil that is highly reliable and can be excellent in mass productivity can be obtained.
すなわち第２図には磁気浮上列車用推進コイルの概略
形状が、第３図にはその横断面が示されている。同図で
４はモールドコイルである推進コイル全体を、５はその
補強リブを、６は軌道の所定の位置に固定するためのボ
ルト穴であり、７はコイルの口出しリードである。コイ
ル導体１には素線絶縁層８が施され、金型（図示せず）
内に設置されると共に、導体周囲に充填材入りレジン
（フイラー入り熱硬化性レジン）が注入・硬化され、レ
ジンモールド層９が形成される。導体間には必要に応じ
て段間絶縁層10を介在させる。金型と導体間にはコイル
導体１を所定の位置に浮かして固定するためのスペーサ
が適宜用いられる。素線絶縁層8,段間絶縁層10はマイカ
などを含有したプリプレグテープあるいはプラスチツク
テープなどを巻回して構成されるが、適宜厚みのスペー
サを介在させコイル導体１間にレジンモールド層９が形
成されるようにしてもよい。レジンモールド層９の表面
には導電性コーテイング11が施され、接地される。導電
性コーテイング11としては金属溶射あるいは金属片を含
有した塗料が塗布され、耐候性塗料の役目も果す。本発
明の中空フイラー入りレジンはレジンモールド層９に適
用される。That is, FIG. 2 shows a schematic shape of a propulsion coil for a magnetic levitation train, and FIG. 3 shows a cross section thereof. In the drawing, reference numeral 4 denotes the entire propulsion coil which is a molded coil, 5 denotes a reinforcing rib thereof, 6 denotes a bolt hole for fixing the track at a predetermined position, and 7 denotes a coil lead. A wire insulation layer 8 is applied to the coil conductor 1 and a mold (not shown)
In addition, a resin containing a filler (a thermosetting resin containing a filler) is injected and cured around the conductor to form a resin mold layer 9. An interstage insulating layer 10 is interposed between the conductors as necessary. A spacer for floating and fixing the coil conductor 1 at a predetermined position is appropriately used between the mold and the conductor. The wire insulation layer 8 and the inter-layer insulation layer 10 are formed by winding a prepreg tape or a plastic tape containing mica or the like, and a resin mold layer 9 is formed between the coil conductors 1 with spacers of appropriate thickness interposed. May be performed. The surface of the resin mold layer 9 is provided with a conductive coating 11 and is grounded. As the conductive coating 11, a coating containing a metal spray or a metal piece is applied, and also serves as a weather-resistant coating. The resin with a hollow filler of the present invention is applied to the resin mold layer 9.
第１図はその充填材入りレジンの拡大図である。同図
で12はエポキシレジンで代表される熱硬化性レジンで、
その中に中空フイラー３と補強材としての短繊維13が混
入されて充填材入りレジン２が形成される。中空フイラ
ー３としてはガラスバルーン，シラスバルーンなどがあ
り、用途によつてはアルミナなどの中空フイラー３も使
える。強化材としての短繊維13には、ガラス繊維，アラ
ミド繊維，延伸ポリエチレン繊維などが使用できる。中
空フイラー３をエポキシレジンなどに混入すると、比重
の違いからエポキシレジンの硬化過程で中空フイラー３
が浮上し、上部がフイラーリツチになる傾向があるが、
適当量の短繊維の混入は中空フイラー３の浮上を抑制で
きる。FIG. 1 is an enlarged view of the resin containing a filler. In the figure, reference numeral 12 denotes a thermosetting resin represented by an epoxy resin.
The resin 2 containing the filler is formed by mixing the hollow filler 3 and the short fibers 13 as a reinforcing material therein. Examples of the hollow filler 3 include a glass balloon and a shirasu balloon, and a hollow filler 3 such as alumina may be used depending on the application. Glass fibers, aramid fibers, drawn polyethylene fibers, and the like can be used as the short fibers 13 as the reinforcing material. When the hollow filler 3 is mixed into the epoxy resin or the like, the difference in specific gravity causes the hollow filler 3 to be hardened during the curing process of the epoxy resin.
Surfacing and the upper part tends to be filler,
Mixing of an appropriate amount of short fibers can suppress the floating of the hollow filler 3.
第４図には中空フイラーの粒径を変えた場合の中空フ
イラー内で放電が発生する電圧の変化が示されている。
同図は縦軸に大気圧、1mmギヤツプが放電を開始する時
の電界を１とした時の倍率ｋをとり、横軸にフイラー粒
径ｒをとつてフイラー粒径ｒと倍率ｋとの関係を示した
ものである。第５図には横軸に中空フイラーの混入量Vf
（VOL.％）をとり、縦軸に絶縁物としての比誘電率εｓ
をとつて中空フイラーの混入量Vfと比誘電率εｓとの関
係が示されている。中空フイラーは充填量50VOL％程度
までは作業性を損うことなく充填可能であるため、第５
図から従来の絶縁構成の比誘電率εscに比較して約半分
の比誘電率まで低減できるのが判る。また、第４図の独
立空間内が空気の場合の曲線Ａ（air）から、中空フイ
ラーの粒径が0.1mm程度以下であれば通常の空気の放電
開始電界の約２倍の値になり、実用上、中空フイラーの
空孔が絶縁上の欠陥とならずに上述のように誘電率低下
の利点が発揮される。更に中空フイラーの独立空間内に
電気的負性ガスであるSF6を充填すると、第４図の曲線
Ｂ（SF6）から明らかなように放電開始電界は著しく改
善され、事実上、中空フイラーが絶縁上の欠陥とはなら
ない。従つてこの場合、導体近傍にボイド，剥離等の発
生があつても、その部分の電界集中はボイド、剥離部囲
りの誘電率が従来のそれに比べて約半分となるので従来
の場合の約半分に低減され、放電劣化の影響は著しく低
減できる。これのみではなく本実施例の構成と絶縁厚み
を適当に決定すれば、ボイド，剥離の発生を一切気にせ
ず製作することができる。FIG. 4 shows a change in voltage at which discharge occurs in the hollow filler when the particle diameter of the hollow filler is changed.
In the figure, the vertical axis represents the atmospheric pressure, the magnification k when the electric field when a 1 mm gap starts discharging is set to 1, and the horizontal axis represents the filler particle size r, and the relationship between the filler particle size r and the magnification k. It is shown. FIG. 5 shows the amount V f of the hollow filler mixed on the horizontal axis.
(VOL.%), The vertical axis indicates the relative dielectric constant εs as an insulator
2 shows the relationship between the mixed amount Vf of the hollow filler and the relative dielectric constant εs. Hollow fillers can be filled up to about 50 VOL% without impairing workability.
From the figure, it can be seen that the relative dielectric constant can be reduced to about half of the relative dielectric constant εsc of the conventional insulating configuration. In addition, from the curve A (air) in FIG. 4 in which the inside of the independent space is air, if the particle size of the hollow filler is about 0.1 mm or less, the value becomes about twice as large as the electric field for starting the discharge of ordinary air. Practically, the advantage of lowering the dielectric constant is exhibited as described above without the holes of the hollow filler becoming defects in insulation. Further filling the SF 6 is electrically negative gas into a separate space of the hollow filler, a discharge start electric field as is clear from Figure 4 curve B (SF 6) are significantly improved, in effect, a hollow filler It does not result in insulation defects. Therefore, in this case, even if a void or peeling occurs near the conductor, the electric field concentration in that part is about half that of the conventional one because the dielectric constant around the void and the peeled part is about half that of the conventional one. As a result, the effect of discharge deterioration can be significantly reduced. In addition to this, if the configuration of the present embodiment and the insulating thickness are appropriately determined, the device can be manufactured without concern for the occurrence of voids and peeling.
このように本実施例によれば従来問題であつた欠陥の
発生を許容でき、生産性を重視した生産が可能で、量産
性のすぐれた推進コイルが得られる。すなわち量産性、
経済性のすぐれたモールドコイルを信頼性を損うことな
く得ることができる。As described above, according to the present embodiment, it is possible to tolerate the occurrence of a defect which has been a problem in the related art, to perform production with an emphasis on productivity, and to obtain a propulsion coil excellent in mass productivity. Ie mass production,
A highly economical molded coil can be obtained without impairing reliability.
なお、SF6を充填した放電開始電界の改善効果は加圧
気体を用いても得られる。The effect of improving the electric field at the start of discharge filled with SF 6 can also be obtained by using a pressurized gas.
また、用途によつては中空フイラーの空孔内に充填す
るガスをSF6から水素あるいはヘリウムなどの熱伝導性
のすぐれたガスに変えると、中空フイラーの充填で低下
した熱伝導性を改善できる。この場合でも誘電率低減の
効果が失われないのは云うまでもない。Also, depending on the application, changing the gas filling the holes of the hollow filler from SF 6 to a gas with excellent thermal conductivity such as hydrogen or helium can improve the thermal conductivity that was reduced by filling the hollow filler. . Even in this case, it goes without saying that the effect of reducing the dielectric constant is not lost.
上述のように本発明はモールドコイルの信頼性が高
く、量産性にすぐれたものとなつて、信頼性が高く、量
産性にすぐれることを可能としたモールドコイルを得る
ことができる。As described above, according to the present invention, a molded coil having high reliability and excellent mass productivity can be obtained, and a molded coil having high reliability and excellent mass productivity can be obtained.
第１図は本発明のモールドコイルの一実施例の充填材入
りレジンの縦断側面図、第２図は同じく一実施例のモー
ルドコイルの斜視図、第３図は同じく一実施例のモール
ドコイルの一部縦断側面図、第４図は大気圧,1mmギヤツ
プが放電を開始する時の電界を１とした時の倍率ｋとフ
イラー粒径ｒとの関係を示す特性図、第５図は中空フイ
ラーの混入量Vfと絶縁物としての比誘電率εｓとの関係
を示す特性図である。 １……コイル導体、２……充填材入りレジン、３……中
空フイラー、４……推進コイル（モールドコイル）、12
……熱硬化性レジン、13……短繊維。FIG. 1 is a longitudinal sectional side view of a resin containing filler according to one embodiment of the molded coil of the present invention, FIG. 2 is a perspective view of the molded coil of the same embodiment, and FIG. FIG. 4 is a characteristic view showing the relationship between the magnification k and the particle size r when the electric field when the 1 mm gap starts discharging is set to 1, and FIG. 5 is a hollow filler. FIG. 6 is a characteristic diagram showing a relationship between the mixed amount Vf of the metal and the relative dielectric constant εs as an insulator. DESCRIPTION OF SYMBOLS 1 ... Coil conductor, 2 ... Resin with filler, 3 ... Hollow filler, 4 ... Propulsion coil (mold coil), 12
... thermosetting resin, 13 ... short fiber.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭53−107615（ＪＰ，Ａ) 特開 昭52−133521（ＪＰ，Ａ) 特開 昭59−213246（ＪＰ，Ａ) 実開 昭61−121780（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) H01F 27/32 H01F 5/06 H02K 15/12──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-107615 (JP, A) JP-A-52-133521 (JP, A) JP-A-59-213246 (JP, A) 121780 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) H01F 27/32 H01F 5/06 H02K 15/12
Claims (7)
浮かして設置され、その周囲がレジンにてモールドされ
ている磁気浮上列車用モールドコイルにおいて、 前記レジン内に、内部に独立空間を有する絶縁性の中空
フイラーと短繊維とが混合充填されていることを特徴と
する磁気浮上列車用モールドコイル。1. A molded coil for a magnetic levitation train in which a coil conductor is installed floating in a mold via an insulating spacer, and the periphery thereof is molded with a resin, wherein the resin has an independent space inside. A molded coil for a magnetic levitation train, characterized by being mixed and filled with an insulating hollow filler and short fibers.
若しくは延伸ポリエチレン繊維の何れかである特許請求
の範囲第１項記載の磁気浮上列車用モールドコイル。2. The molded coil for a magnetic levitation train according to claim 1, wherein said short fibers are glass fibers, aramid fibers or drawn polyethylene fibers.
ラスバルーン若しくはアルミナバルーンの何れかである
特許請求の範囲第１項記載の磁気浮上列車用モールドコ
イル。3. The molded coil for a magnetic levitation train according to claim 1, wherein said hollow filler is one of a glass balloon, a shirasu balloon and an alumina balloon.
ある特許請求の範囲第１項記載の磁気浮上列車用モール
ドコイル。4. The molded coil for a magnetic levitation train according to claim 1, wherein said hollow filler has a particle size of 0.1 mm or less.
性ガス，高熱伝導ガス，大気圧以上のガスの何れかが封
入されたものである特許請求の範囲第１項記載の磁気浮
上列車用モールドコイル。5. The magnetic levitation train according to claim 1, wherein any one of an electrically negative gas, a high heat conduction gas, and a gas having a pressure higher than the atmospheric pressure is sealed in a hollow portion of the hollow filler. Mold coil.
許請求の範囲第５項記載の磁気浮上列車用モールドコイ
ル。6. A molded coil for a magnetic levitation train according to claim 5, wherein said electrically negative gas is SF 6 gas.
のいずれかである特許請求の範囲第５項記載の磁気浮上
列車用モールドコイル。7. The molded coil for a magnetic levitation train according to claim 5, wherein said high thermal conductive gas is one of hydrogen and helium gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63124138A JP2749323B2 (en) | 1988-05-21 | 1988-05-21 | Molded coil for magnetic levitation train |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63124138A JP2749323B2 (en) | 1988-05-21 | 1988-05-21 | Molded coil for magnetic levitation train |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01293509A JPH01293509A (en) | 1989-11-27 |
| JP2749323B2 true JP2749323B2 (en) | 1998-05-13 |
Family
ID=14877861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63124138A Expired - Fee Related JP2749323B2 (en) | 1988-05-21 | 1988-05-21 | Molded coil for magnetic levitation train |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2749323B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5683059A (en) * | 1995-04-24 | 1997-11-04 | Toyo Boseki Kabushiki Kaisha | Bobbin for superconducting coils |
| US20110017494A1 (en) * | 2009-07-24 | 2011-01-27 | General Electric Company | Insulating compositions and devices incorporating the same |
| US10032529B2 (en) | 2010-12-09 | 2018-07-24 | Westinghouse Electric Company Llc | Nuclear reactor internal electric control rod drive mechanism assembly |
| WO2022239191A1 (en) * | 2021-05-13 | 2022-11-17 | 三菱電機株式会社 | Insulating molded body and stationary induction apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52133521A (en) * | 1976-05-04 | 1977-11-09 | Hitachi Ltd | Molding method for molded electric machinery |
| JPS53107615A (en) * | 1977-03-01 | 1978-09-19 | Osaki Denki Kougiyou Kk | Method of manufacturing transformer coil mold |
| JPS602867A (en) * | 1983-06-20 | 1985-01-09 | 三菱電機株式会社 | Manufacture of inner box for refrigerator |
-
1988
- 1988-05-21 JP JP63124138A patent/JP2749323B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01293509A (en) | 1989-11-27 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |