JP4448916B2

JP4448916B2 - Molded stranded conductor and coil using the same

Info

Publication number: JP4448916B2
Application number: JP2001288614A
Authority: JP
Inventors: 健治香月; 芳治金井; 潔和佐藤; 教夫谷; 利一安達; 洋年蛯子; 佐藤　　淳; 壮一赤坂
Original assignee: Toshiba Corp; SWCC Showa Cable Systems Co Ltd
Current assignee: Toshiba Corp; SWCC Showa Cable Systems Co Ltd
Priority date: 2001-09-21
Filing date: 2001-09-21
Publication date: 2010-04-14
Anticipated expiration: 2021-09-21
Also published as: JP2003100150A

Description

【０００１】
【発明の属する技術分野】
この発明は、成形撚線導体およびこれを用いたコイルに係わり、特に、交流環境下での交流損失の低減を図ることができる成形撚線導体およびこれを用いたコイルに関する。
【０００２】
【従来の技術】
一般に、交流電磁石のコイル用導体としては、うず電流による交流損失を低減するため撚線導体が必要とされている。また、かかる撚線導体への通電による温度上昇を抑制するためコイル用導体の内部に、冷却媒体が流通する冷却管を配置する必要がある。さらに、撚線導体としては、コイル巻する場合の占積率を向上させるため、圧縮成形後の仕上り断面を略矩形状に成形することが望まれている。
【０００３】
従来、この種のコイル用導体としては、図７に示すようなものが知られている。同図において、従来のコイル用導体は、冷却媒体が流通する丸型冷却管２０と、この丸型冷却管２０の外周に複数の層を構成するように横巻きされた多数本の導線（以下、「撚線導体」という。）２１とを備えている。
【０００４】
しかして、撚線導体２１は、その仕上り断面が略矩形状を呈するようにローラーダイス（不図示）によって圧縮成形され、成形後の撚線導体の外周には絶縁層２２が設けられている。
【０００５】
一方、このような構成のコイル用導体を断面略矩形状に圧縮成形する方法としては、丸型冷却管２０の外方に配設される複数層の撚線導体２１を、一括して断面略矩形状に圧縮成形する方法と、丸型冷却管２０の外方に配設される複数層の撚線導体２１を、各層毎に断面略矩形状に圧縮成形する方法とが知られている。
【０００６】
しかしながら、前者の圧縮成形方法においては、最外層側に配設される撚線導体の圧縮加工度が最外層より内側に配設される撚線導体の圧縮加工度よりも大きくなることから、内側に配設される撚線導体の圧縮成形後の外径が必要以上に細くなり、この結果、最外層に配設される撚線導体の導線の一部が余分になり、この余分な導線が最外層の外側にはみ出る虞があった。また、圧縮成形時における撚線導体の径方向の応力によって中心に配置される丸型冷却管が著しく変形する虞もあった。
【０００７】
また、後者の圧縮成形方法においては、撚線導体２１の各層の圧縮加工度は略均一になるものの、中心に配置される冷却管２０が丸型であるため、最内層に配設される撚線導体を断面略矩形状に圧縮成形することが困難となり、ひいては最内層の外側に配設される第２、第３の層を構成する撚線導体を断面略矩形状に圧縮成形することが困難になるという難点があった。
【０００８】
このため、丸型冷却管２０の外周部対角四隅に、撚線導体２１と同種構成の金属線例えばアルミ線を縦添えした後に、最内層の撚線導体を配設し、これを断面略矩形状に圧縮成形する方法が案出されている。
【０００９】
このような圧縮成形方法によれば、金属線の縦添えによって丸型冷却管２０の見掛け上の外形が略四角形状を呈することから、最内層を構成する撚線導体も略四角形状に配列でき、この結果、丸型冷却管２０に変形を与えることなく撚線導体を断面略矩形状に圧縮成形することができる。
【００１０】
【発明が解決しようとする課題】
しかしながら、このような金属線を縦添えした成形撚線導体においては、丸型冷却管の外周部対角四隅に配置される金属線が撚られていないため、撚線導体に交流電流を通電した場合、若しくは撚線導体が交番磁界下に置かれた場合においては、撚線導体に発生する交流損失が大きくなり、ひいてはコイル用導体に撚線導体を採用した意義が失われるという難点があった。
【００１１】
本発明は、上述の難点を解決するためになされたもので、丸型冷却管を変形させずに仕上り断面を略矩形状に圧縮成形することができ、また、交流環境下における交流損失の発生を低減できる成形撚線導体およびこれを用いたコイルを提供することを目的としている。
【００１２】
【課題を解決するための手段】
このような目的を達成するため、本発明の成形撚線導体は、冷却媒体が流通する丸型冷却管と、この丸型冷却管の外方に配設される撚線導体とを備え、丸型冷却管の外周部対角四隅に、線状の絶縁材を縦添えすることにより、丸型冷却管に接する側の撚線導体が断面略矩形状に配列されることを特徴としている。
【００１３】
本発明の成形撚線導体によれば、線状の絶縁材の縦添えによって丸型冷却管の見掛け上の外形が略四角形状を呈することになり、この結果、丸型冷却管に接する側、すなわち最内層に配設される撚線導体を略四角形状に配列することができ、ひいては、丸型冷却管に変形を与えずに撚線導体を断面略矩形状に圧縮成形することができる。また、丸型冷却管の外周部対角四隅に線状の絶縁材が縦添えされていることから、交流環境下における交流損失の発生を低減できる。
【００１４】
また、本発明のコイルは、前記成形撚線導体の外周に絶縁被膜を設け、これを巻回したことを特徴としている。
【００１５】
本発明のコイルによれば、仕上り断面が略矩形状とされた成形撚線導体を巻回していることから、コイルの占積率を向上させることができる。
【００１６】
【発明の実施の形態】
以下、本発明に係る成形撚線導体およびこれを用いたコイルの好ましい実施形態について、図面を参照して説明する。
【００１７】
図１は、本発明の実施形態による１層構成の成形撚線導体を示す横断面図であり、図２は、図１に示した成形撚線導体における半製品を示す横断面図である。図３は同じく２層構成の成形撚線導体を示す横断面図であり、図４は、３層構成の成形撚線導体を示す横断面図である。図５は、絶縁被膜を設けた成形撚線導体（コイル用導体）を示す横断面図であり、図６は、図５に示した導体により構成されるコイルを示す横断面図である。
【００１８】
図１および図２において、本発明における成形撚線導体は、中心に非磁性材料から成る丸型冷却管１を備えており、この丸型冷却管１の内部には水等の冷却媒体が流通される。ここで、丸型冷却管１としては、外径が１４ｍｍで内径が１２ｍｍのステンレススチール管が使用されている。
【００１９】
次に、丸型冷却管１の外周部対角四隅に、外径が３．５ｍｍ程度の線状の絶縁材２が丸型冷却管１の長手方向に沿って平行に縦添えされ、これにより、丸型冷却管１の見掛け上の外形、すなわち４本の絶縁材２の外周間に跨って外接する外形が、図２の２点鎖線で示すように、略四角形状を呈することになる。
【００２０】
ここで、絶縁材２としては、適度の硬度を有する絶縁性の線状体、例えばエポキシ樹脂やポリイミド樹脂を含浸させたガラス繊維が使用される。絶縁材２として、適度の硬度を有する線状体を使用するのは、絶縁材の過変形を防止し、また後述する撚線導体の歪を防止するためである。すなわち、絶縁材２として、過度に軟質の絶縁材を使用すると、導線の横巻時における応力によって絶縁材が著しく変形し、この絶縁材の変形によって上記の丸型冷却管１の見掛け上の外形（略四角形状）が崩れ、ひいては丸型冷却管１に接する側の撚線導体を略矩形状に配列することが困難になるからである。なお、導線の横巻時の応力や後述する圧縮時の応力によって絶縁材２が若干変形してもよく、要は、丸型冷却管１に接する側の撚線導体が略矩形状に配列されれば良い。逆に、その硬度を導線の硬度よりも大きくすると、後述のコイル製作時における曲げ加工によって撚線導体に歪を生じさせる虞があるからである。
【００２１】
しかして、見掛け上の外形が略四角形状とされた丸型冷却管１の外周には、外径が３．１ｍｍの導線３（１９本）が、層心径の１１．２倍程度のピッチで右方向に同心状に撚り合せられて、最内層の撚線導体４が形成される。ここで、導線３としては、圧縮成形を容易にするため、硬アルミ線を１６０℃程度の温度で４時間程度焼鈍処理したいわゆる軟アルミ線が使用される。なお、軟アルミ線を使用する点は、図３および図４に示す成形撚線導体を製造する場合も同様である。
【００２２】
このようにして得られた撚線導体４は、ローラーダイス等により、その縦横の幅がそれぞれ１９ｍｍ程度になるように圧縮成形される。これにより、圧縮成形後の仕上り断面が略矩形状とされた成形撚線導体が得られる。
【００２３】
次に、図３に示すように、２層構成の成形撚線導体を製造する場合は、図１に示した撚線導体４の外周に、外径が２．８ｍｍの導線５（２８本）を、層心径の１１．５倍程度のピッチで左方向に同心状に撚り合せて、第２の層としての撚線導体６を形成し、前述と同様に、ローラーダイス等によって、その縦横の幅がそれぞれ２３．７ｍｍ程度になるように圧縮成形する。これにより、圧縮成形後の断面が略矩形状とされた２層構成の成形撚線導体が得られる。なお、２層構成の成形撚線導体を製造する場合においては、最内層の撚線導体が断面略矩形状とされているため、前述の絶縁材２の縦添えは不要となる。この点は、図４に示す成形撚線導体を製造する場合も同様である。
【００２４】
続いて、図４に示すように、３層構成の成形撚線導体を製造する場合は、図３に示す第２の層としての撚線導体６の外周に、外径が２．８ｍｍの導線７（３４本）を、層心径の１０．７倍程度のピッチで右方向に同心状に撚り合せて、第３の層としての撚線導体８を形成し、前述と同様に、ローラーダイス等によって、その縦横の幅がそれぞれ２８．５ｍｍ程度になるように圧縮成形する。これにより、圧縮成形後の断面が略矩形状とされた３層構成の成形撚線導体が得られる。
【００２５】
このような構成の成形撚線導体においては、丸型冷却管１の外周部対角四隅に線状の絶縁材２が配置されていることから、成形撚線導体の角型成形を容易に行なうことができ、また、縦添えされる線状材が絶縁材料で形成されていることから、交流環境下における交流損失の低減を図ることができる。
【００２６】
次に、以上のようにして得られた成形撚線導体を利用したコイルおよびその製法について述べる。
【００２７】
図５は、図４に示した成形撚線導体を用いて構成されるコイル用導体を示している。なお、図４と共通する部分には同一の符号を付して詳細な説明を省略する。図５において、先ず、前述のようにして得られた例えば３層構成の成形撚線導体の外周に、ガラステープないしエポキシやポリイミドなどの樹脂を含浸して半焼成したガラステープなどを巻いて絶縁被膜９を形成する。そして、この絶縁被膜９を有する成形撚線導体１０を、図６に示すように、例えば８列３段に積層してコイル状に巻回し、全体をエポキシ樹脂ないしポリイミド樹脂などで真空含浸して導線間の隙間を樹脂で埋め尽くすことにより拠線導体の中心に配置された冷却パイプへの熱伝導が向上し冷却特性に優れたコイルが得られる。その後その外周に対地絶縁としてエポキシやポリイミドなどの樹脂を含浸して半焼成したガラステープやガラスとマイカの複合体のテープを巻きつけて焼成し、強固な絶縁体１１を設ける。
【００２８】
このようにして得られたコイル１２は、例えば、交流電磁石を構成する鉄心１３に装着される。
【００２９】
このような構成のコイル１２においては、仕上り断面が略矩形状に成形された成形撚線導体を用いていることから、コイルの占積率を向上させることができる。
【００３０】
なお、以上の実施形態においては、撚線導体を構成する導線として軟アルミ線を使用しているが、本発明はこれに限定されず、例えば硬アルミ線や軟銅線等を使用しても同様の効果を得ることができる。軟銅線を用いる場合には表面の電気伝導度を小さくするためにあらかじめ線の表面をホルマール処理などで絶縁しておくことが望ましい。
【００３１】
また、丸型冷却管や導線の寸法、絶縁線の寸法や本数、成形撚り線導体の仕上がり寸法等は前述の実施形態に限られるものではなく、用途に応じて適した構成とすることになる。
【００３２】
【発明の効果】
以上の説明から明らかなように、本発明の成形撚線導体によれば、丸型冷却管に接する側の撚線導体を略矩形状に配列することができ、ひいては、丸型冷却管に変形を与えずに撚線導体を断面略矩形状に圧縮成形することができる。また、丸型冷却管の外周部対角四隅に線状の絶縁材が縦添えされていることから、交流環境下における交流損失の発生を低減できる。
【００３３】
また、本発明のコイルによれば、仕上り断面が略矩形状とされた成形撚線導体を巻回していることから、コイルの占積率を向上させることができる。
【図面の簡単な説明】
【図１】本発明の実施形態による１層構成の成形撚線導体を示す横断面図。
【図２】図１に示した成形撚線導体における半製品の横断面図。
【図３】本発明の実施形態による２層構成の成形撚線導体を示す横断面図。
【図４】本発明の実施形態による３層構成の成形撚線導体を示す横断面図。
【図５】本発明の実施形態によるコイル用導体を示す横断面図。
【図６】本発明の実施形態によるコイルを示す一部断面図。
【図７】従来の成形撚線導体の横断面図。
【符号の説明】
１丸型冷却管
２線状の絶縁材
３、５、７導線
４、６、８撚線導体
９絶縁被膜
１０絶縁被膜を有する成形撚線導体（コイル用導体）
１２コイル[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molded stranded conductor and a coil using the same, and more particularly to a molded stranded conductor capable of reducing AC loss in an AC environment and a coil using the same.
[0002]
[Prior art]
In general, a stranded wire conductor is required as a coil conductor of an AC electromagnet in order to reduce AC loss due to eddy current. Moreover, in order to suppress the temperature rise by the electricity supply to this twisted wire conductor, it is necessary to arrange | position the cooling pipe | tube with which a cooling medium distribute | circulates inside the conductor for coils. Furthermore, as a stranded wire conductor, in order to improve the space factor when coiled, it is desired that the finished cross section after compression molding is formed into a substantially rectangular shape.
[0003]
Conventionally, such a coil conductor as shown in FIG. 7 is known. In the figure, a conventional coil conductor is composed of a round cooling pipe 20 through which a cooling medium flows, and a large number of conductor wires (hereinafter referred to as a plurality of wires) that are horizontally wound so as to form a plurality of layers on the outer periphery of the circular cooling pipe 20. , “Twisted wire conductor”) 21.
[0004]
Thus, the stranded conductor 21 is compression-molded by a roller die (not shown) so that the finished cross section has a substantially rectangular shape, and an insulating layer 22 is provided on the outer periphery of the stranded conductor after the molding.
[0005]
On the other hand, as a method of compression-molding the coil conductor having such a configuration into a substantially rectangular cross section, a plurality of stranded wire conductors 21 disposed outside the round cooling pipe 20 are collectively cut in cross section. A method of compression-molding into a rectangular shape and a method of compressing and molding a plurality of layers of stranded wire conductors 21 disposed outside the round cooling pipe 20 into a substantially rectangular cross section for each layer are known.
[0006]
However, in the former compression molding method, the compression processing degree of the stranded wire conductor disposed on the outermost layer side is larger than the compression processing degree of the stranded wire conductor disposed on the inner side of the outermost layer. The outer diameter after compression molding of the stranded conductor disposed in the outermost layer becomes thinner than necessary. As a result, a part of the conductor of the stranded conductor disposed in the outermost layer becomes extra, and this extra conductor is There was a risk of protruding outside the outermost layer. In addition, there is a possibility that the round cooling pipe disposed at the center is significantly deformed by the stress in the radial direction of the stranded wire conductor during compression molding.
[0007]
Further, in the latter compression molding method, although the degree of compression processing of each layer of the stranded wire conductor 21 is substantially uniform, the cooling pipe 20 disposed in the center is round, so that the twist disposed in the innermost layer. It becomes difficult to compression-mold the wire conductor into a substantially rectangular cross section, and as a result, the stranded wire conductors constituting the second and third layers disposed outside the innermost layer can be compression-molded into a substantially rectangular cross section. There was the difficulty of becoming difficult.
[0008]
For this reason, a metal wire having the same type of configuration as the stranded wire conductor 21, for example, an aluminum wire, is vertically attached to the four corners of the outer periphery of the round cooling pipe 20, and then the innermost stranded wire conductor is disposed. A method of compression molding into a rectangular shape has been devised.
[0009]
According to such a compression molding method, the apparent outer shape of the round cooling pipe 20 has a substantially square shape due to the vertical attachment of the metal wire, so that the stranded wire conductors constituting the innermost layer can also be arranged in a substantially rectangular shape. As a result, the stranded wire conductor can be compression-molded into a substantially rectangular cross section without deforming the round cooling tube 20.
[0010]
[Problems to be solved by the invention]
However, in such a molded stranded wire conductor vertically attached with a metal wire, the metal wire arranged at the diagonal corners of the outer periphery of the round cooling pipe is not twisted, so an alternating current was passed through the stranded wire conductor. In this case, or when the stranded wire conductor is placed under an alternating magnetic field, the AC loss generated in the stranded wire conductor increases, and the significance of adopting the stranded wire conductor as the coil conductor is lost. .
[0011]
The present invention has been made to solve the above-mentioned problems, and the finished cross section can be compression-molded into a substantially rectangular shape without deforming the round cooling pipe, and the occurrence of AC loss in an AC environment. An object of the present invention is to provide a molded stranded wire conductor capable of reducing the resistance and a coil using the same.
[0012]
[Means for Solving the Problems]
In order to achieve such an object, the molded stranded conductor of the present invention includes a round cooling pipe through which a cooling medium flows, and a stranded conductor disposed outside the round cooling pipe. The stranded wire conductor on the side in contact with the round cooling pipe is arranged in a substantially rectangular cross section by vertically attaching a linear insulating material to the diagonal corners of the outer periphery of the mold cooling pipe.
[0013]
According to the formed twisted wire conductor of the present invention, the apparent outer shape of the round cooling pipe will exhibit a substantially rectangular shape due to the vertical attachment of the linear insulating material, as a result, the side in contact with the round cooling pipe, That is, the stranded wire conductors arranged in the innermost layer can be arranged in a substantially rectangular shape, and as a result, the stranded wire conductor can be compression-molded into a substantially rectangular cross section without deforming the round cooling pipe. Moreover, since the linear insulating material is vertically attached to the four corners of the outer peripheral portion of the round cooling pipe, the generation of AC loss in an AC environment can be reduced.
[0014]
The coil of the present invention is characterized in that an insulating coating is provided on the outer periphery of the molded stranded wire conductor, and this is wound.
[0015]
According to the coil of the present invention, the space factor of the coil can be improved because the formed stranded wire conductor having a substantially rectangular cross section is wound.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a molded stranded conductor and a coil using the same according to the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is a cross-sectional view showing a one-layer formed twisted wire conductor according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a semi-finished product in the formed twisted wire conductor shown in FIG. FIG. 3 is a cross-sectional view showing a formed twisted wire conductor having a two-layer structure, and FIG. 4 is a cross-sectional view showing a formed twisted wire conductor having a three-layer structure. FIG. 5 is a cross-sectional view showing a molded stranded conductor (coil conductor) provided with an insulating coating, and FIG. 6 is a cross-sectional view showing a coil constituted by the conductor shown in FIG.
[0018]
1 and 2, the molded stranded conductor in the present invention includes a round cooling pipe 1 made of a nonmagnetic material at the center, and a cooling medium such as water circulates inside the round cooling pipe 1. Is done. Here, as the round cooling pipe 1, a stainless steel pipe having an outer diameter of 14 mm and an inner diameter of 12 mm is used.
[0019]
Next, linear insulating materials 2 having an outer diameter of about 3.5 mm are vertically attached to the four corners of the outer periphery of the round cooling pipe 1 in parallel along the longitudinal direction of the round cooling pipe 1. The apparent outer shape of the round cooling pipe 1, that is, the outer shape that circumscribes the outer periphery of the four insulating materials 2, exhibits a substantially rectangular shape as indicated by the two-dot chain line in FIG.
[0020]
Here, as the insulating material 2, an insulating linear body having an appropriate hardness, for example, a glass fiber impregnated with an epoxy resin or a polyimide resin is used. The reason why the linear body having an appropriate hardness is used as the insulating material 2 is to prevent over-deformation of the insulating material and to prevent distortion of the stranded wire conductor described later. That is, when an excessively soft insulating material is used as the insulating material 2, the insulating material is significantly deformed due to the stress during the horizontal winding of the conducting wire, and the apparent outer shape of the round cooling pipe 1 is deformed by the deformation of the insulating material. This is because (substantially square shape) collapses, and as a result, it becomes difficult to arrange the stranded conductors on the side in contact with the round cooling pipe 1 in a substantially rectangular shape. Note that the insulating material 2 may be slightly deformed by the stress at the time of horizontal winding of the conducting wire and the stress at the time of compression described later. In short, the stranded conductors on the side in contact with the round cooling tube 1 are arranged in a substantially rectangular shape. Just do it. On the contrary, if the hardness is larger than the hardness of the conducting wire, there is a risk that the twisted wire conductor may be distorted by bending during coil manufacturing described later.
[0021]
Thus, on the outer periphery of the round cooling pipe 1 whose apparent outer shape is substantially rectangular, a conductor 3 (19 wires) having an outer diameter of 3.1 mm has a pitch of about 11.2 times the layer core diameter. Thus, the innermost stranded wire conductor 4 is formed by concentrically twisting in the right direction. Here, in order to facilitate compression molding, a so-called soft aluminum wire obtained by annealing a hard aluminum wire at a temperature of about 160 ° C. for about 4 hours is used as the conductive wire 3. In addition, the point which uses a soft aluminum wire is the same also when manufacturing the shaping | molding twisted-wire conductor shown in FIG.3 and FIG.4.
[0022]
The stranded conductor 4 obtained in this way is compression-molded by a roller die or the like so that the vertical and horizontal widths are each about 19 mm. As a result, a molded stranded wire conductor whose finished cross section after compression molding has a substantially rectangular shape is obtained.
[0023]
Next, as shown in FIG. 3, in the case of manufacturing a two-layer formed twisted conductor, the conductor 5 (28 wires) having an outer diameter of 2.8 mm is provided on the outer periphery of the twisted conductor 4 shown in FIG. Are twisted concentrically in the leftward direction at a pitch of about 11.5 times the layer core diameter to form a stranded wire conductor 6 as the second layer. The compression molding is performed so that the width of each becomes about 23.7 mm. Thereby, the shaping | molding strand wire conductor of the 2 layer structure by which the cross section after compression molding was made into the substantially rectangular shape is obtained. In the case of manufacturing a two-layer formed stranded conductor, the innermost stranded conductor has a substantially rectangular cross section, so that the vertical attachment of the insulating material 2 is not necessary. This also applies to the case where the molded stranded wire conductor shown in FIG. 4 is manufactured.
[0024]
Subsequently, as shown in FIG. 4, in the case of manufacturing a three-layer formed twisted conductor, a conductor having an outer diameter of 2.8 mm is provided on the outer periphery of the twisted conductor 6 as the second layer shown in FIG. 3. 7 (34 wires) are twisted concentrically in the right direction at a pitch of about 10.7 times the layer core diameter to form a stranded wire conductor 8 as the third layer. For example, compression molding is performed so that the vertical and horizontal widths are about 28.5 mm. Thereby, a molded stranded wire conductor having a three-layer structure in which the cross section after compression molding is substantially rectangular is obtained.
[0025]
In the formed stranded wire conductor having such a configuration, the linear insulation material 2 is disposed at the four corners of the outer peripheral portion of the round cooling pipe 1, and therefore, the formed stranded wire conductor can be easily formed into a square shape. In addition, since the linearly attached linear material is formed of an insulating material, it is possible to reduce AC loss in an AC environment.
[0026]
Next, a coil using the molded stranded wire conductor obtained as described above and a manufacturing method thereof will be described.
[0027]
FIG. 5 shows a coil conductor formed using the molded stranded wire conductor shown in FIG. In addition, the same code | symbol is attached | subjected to the part which is common in FIG. 4, and detailed description is abbreviate | omitted. In FIG. 5, first, for example, a glass tape or a semi-baked glass tape impregnated with a resin such as epoxy or polyimide is wound around the outer periphery of a three-layer formed stranded conductor obtained as described above to insulate. A film 9 is formed. Then, as shown in FIG. 6, the formed twisted wire conductor 10 having the insulating coating 9 is laminated in, for example, 8 rows and 3 stages and wound in a coil shape, and the whole is vacuum-impregnated with an epoxy resin or a polyimide resin. By filling the gaps between the conductive wires with resin, the heat conduction to the cooling pipe arranged at the center of the base conductor is improved, and a coil having excellent cooling characteristics can be obtained. Thereafter, a glass tape that has been impregnated with a resin such as epoxy or polyimide as a ground insulation and semi-baked glass tape or a composite tape of glass and mica is wound around the outer periphery and fired to provide a strong insulator 11.
[0028]
The coil 12 obtained in this way is mounted on, for example, an iron core 13 constituting an AC electromagnet.
[0029]
Since the coil 12 having such a configuration uses a molded stranded wire conductor whose finished cross section is formed in a substantially rectangular shape, the space factor of the coil can be improved.
[0030]
In the above embodiment, a soft aluminum wire is used as the conductive wire constituting the stranded conductor. However, the present invention is not limited to this. For example, a hard aluminum wire or a soft copper wire may be used. The effect of can be obtained. When using an annealed copper wire, it is desirable to insulate the surface of the wire in advance by a formal treatment or the like in order to reduce the electrical conductivity of the surface.
[0031]
Further, the dimensions of the round cooling pipe and the conductive wire, the dimensions and number of the insulated wires, the finished dimensions of the formed stranded conductor, etc. are not limited to the above-described embodiment, and the configuration is suitable according to the application. .
[0032]
【The invention's effect】
As is apparent from the above description, according to the molded stranded conductor of the present invention, the stranded conductors on the side in contact with the round cooling pipe can be arranged in a substantially rectangular shape, and as a result, transformed into a round cooling pipe. The twisted wire conductor can be compression-molded into a substantially rectangular cross section without giving any. Moreover, since the linear insulating material is vertically attached to the four corners of the outer peripheral portion of the round cooling pipe, the generation of AC loss in an AC environment can be reduced.
[0033]
Moreover, according to the coil of this invention, since the shaping | molding twisted-wire conductor by which the finishing cross section was made into the substantially rectangular shape is wound, the space factor of a coil can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a single-layer formed twisted wire conductor according to an embodiment of the present invention.
2 is a cross-sectional view of a semi-finished product of the molded stranded conductor shown in FIG.
FIG. 3 is a cross-sectional view showing a two-layer molded stranded conductor according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a three-layer molded stranded wire conductor according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view showing a coil conductor according to an embodiment of the present invention.
FIG. 6 is a partial cross-sectional view showing a coil according to an embodiment of the present invention.
FIG. 7 is a cross-sectional view of a conventional molded stranded conductor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Round cooling tube 2 Linear insulation material 3, 5, 7 Conductor 4, 6, 8 Twisted wire conductor 9 Insulation film 10 Molded stranded wire conductor (insulation film conductor) which has an insulation film
12 coils

Claims

冷却媒体が流通する丸型冷却管と、この丸型冷却管の外方に配設される撚線導体とを備え、前記丸型冷却管の外周部対角四隅に、線状の絶縁材を縦添えすることにより、前記丸型冷却管に接する側の前記撚線導体が断面略矩形状に配列されることを特徴とする成形撚線導体。 A round cooling pipe through which the cooling medium flows, and a stranded conductor disposed outside the round cooling pipe, and a linear insulating material is provided at the four corners of the outer periphery of the round cooling pipe. The formed stranded wire conductor, wherein the stranded wire conductor on the side in contact with the round cooling pipe is arranged in a substantially rectangular cross section by being vertically attached.

請求項１に記載の成形撚線導体の外周に絶縁被膜を設け、これを巻回したことを特徴とするコイル。 An insulating film is provided on the outer periphery of the molded stranded wire conductor according to claim 1, and the coil is wound.