JPH0231577B2 - - Google Patents
Info
- Publication number
- JPH0231577B2 JPH0231577B2 JP54156772A JP15677279A JPH0231577B2 JP H0231577 B2 JPH0231577 B2 JP H0231577B2 JP 54156772 A JP54156772 A JP 54156772A JP 15677279 A JP15677279 A JP 15677279A JP H0231577 B2 JPH0231577 B2 JP H0231577B2
- Authority
- JP
- Japan
- Prior art keywords
- base material
- corona shield
- insulating layer
- main insulating
- corona
- 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 - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は回転電機における固定子コイルエンド
のコロナシールド法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a corona shielding method for stator coil ends in rotating electric machines.
第１図は従来のコロナシールド処理方法による
コイルの縦断面図である。図において符号１はコ
イル導体、２は主絶縁層、３はコイルのスロツト
内コロナ防止用抵抗導電層、４はこれと連接する
コロナシールドで、例えばアスベスト等の不連続
性繊維をより合わせた糸により形成される半導電
性の織布または不織布（以下、基材と称する）４
ａを巻回し、固着材４ｂを含浸または塗布処理し
たものである。
FIG. 1 is a longitudinal cross-sectional view of a coil obtained by a conventional corona shield treatment method. In the figure, numeral 1 is the coil conductor, 2 is the main insulating layer, 3 is the resistive conductive layer for corona prevention in the slot of the coil, and 4 is the corona shield connected to this, for example, a thread made of twisted discontinuous fibers such as asbestos. A semiconductive woven fabric or nonwoven fabric (hereinafter referred to as base material) formed by 4
A is wound and impregnated or coated with a fixing material 4b.
この従来方式によるコロナシールドでは、予め
硬化した主絶縁層２の外周にコロナシールド層４
を施すため、第２図、第３図に示すように、主絶
縁層２とコロナシールド層４の界面に空隙５を生
じやすく、上記空隙内の点Ｐ，P1間にｅなる電
位差が生ずるのである。第３図において、Iiはコ
イル導体１に印加された電圧によつて主絶縁層２
を介して流れる電流Ｉが、主絶縁層２の表面に沿
つて流れる電流、Icは上記電流Ｉがコロナシール
ド層４内を流れる電流、Riは主絶縁層２のOP1間
の表面抵抗、Rcはコロナシールド層４のOP間の
表面抵抗である。しかるに、前記電位差ｅは次式
のように示される。
In this conventional method of corona shielding, a corona shield layer 4 is formed on the outer periphery of a main insulating layer 2 that has been hardened in advance.
As shown in FIGS. 2 and 3, a gap 5 is likely to be formed at the interface between the main insulating layer 2 and the corona shield layer 4, and a potential difference e is generated between points P and P1 within the gap. It is. In FIG. 3, Ii is a voltage applied to the coil conductor 1 which causes the main insulating layer 2 to
The current I that flows through is the current that flows along the surface of the main insulating layer 2, Ic is the current that the current I flows through within the corona shield layer 4, Ri is the surface resistance between OP 1 of the main insulating layer 2, Rc is the surface resistance between OPs of the corona shield layer 4. However, the potential difference e is expressed by the following equation.
ｅ＝IcRc−IiRi
コロナシールド層４の表面抵抗値は107〜109
〔Ω〕に設定されるので普通であり、主絶縁層２
の抵抗値に比べ102〜105〔Ω〕程小さく、電流Ｉ
はほとんどコロナシールド層４を介して導電層３
に流れるため、Icに対してIiは極めて微小であ
る。一方、空隙５は周囲をワニスで覆われている
と考えられ、したがつてRiはRcとほぼ同等の抵
抗値なのである。しかるに、IcRc≧IiRiとなり、
前記電位差ｅはｅ≒IcRcとなる。 e=IcRc−IiRi The surface resistance value of the corona shield layer 4 is 10 7 to 10 9
It is normal because it is set to [Ω], and the main insulating layer 2
It is about 10 2 to 10 5 [Ω] smaller than the resistance value of
is mostly the conductive layer 3 via the corona shield layer 4
Therefore, Ii is extremely small compared to Ic. On the other hand, the void 5 is considered to be covered with varnish, and therefore Ri has a resistance value almost equal to Rc. However, IcRc≧IiRi,
The potential difference e is e≈IcRc.
上記電位差ｅにより、空隙５内でコロナ放電が
生じ、回転電機の運転中に、上記コロナ放電が増
長され、コロナシールドの効果が失なわれること
になり、さらに、上記コロナ放電による局部加熱
により主絶縁層２の劣化が促進されることがあ
る。 Due to the potential difference e, corona discharge occurs within the air gap 5, and during operation of the rotating electric machine, the corona discharge increases and the effect of the corona shield is lost.Furthermore, local heating due to the corona discharge causes Deterioration of the insulating layer 2 may be accelerated.
なお、コロナシールド層４は抵抗導電層３のス
ロツト出口端部の電位傾度を緩和して、その端部
におけるコロナ発生を防止するものであるが、コ
ロナシールド層４の抵抗値を抵抗導電層３と同程
度にすると電位傾度は大となり、逆にコロナシー
ルド層４の抵抗値を高くしすぎると電位傾度の緩
和作用が期待できなくなる。したがつて、コロナ
シールド層４の抵抗値は抵抗導電層３よりも高
く、主絶縁層２よりも低い値にするとともに、そ
の抵抗値を任意の値に設定可能にすることが望ま
しい。 Note that the corona shield layer 4 is intended to reduce the potential gradient at the slot exit end of the resistive conductive layer 3 and prevent corona generation at that end. If the resistance value of the corona shield layer 4 is made to be about the same as that, the potential gradient will become large, and conversely, if the resistance value of the corona shield layer 4 is made too high, the effect of mitigating the potential gradient cannot be expected. Therefore, it is desirable that the resistance value of the corona shield layer 4 is higher than that of the resistive conductive layer 3 and lower than that of the main insulating layer 2, and that the resistance value can be set to any value.
ところで、コロナシールド層４の抵抗値を低く
保持するには、半導電性のコロナシールド基材４
ａの各繊維が、できるだけ相互に直接接触した状
態に在ることが望ましい。 By the way, in order to keep the resistance value of the corona shield layer 4 low, semiconductive corona shield base material 4 is used.
It is desirable that the fibers of a are in direct contact with each other as much as possible.
しかしながら、適切な抵抗値を有する半導電性
のコロナシールド基材４ａを用いたとしても、固
着剤４ｂがコロナシールド基材４ａの繊維間に含
浸されると、コロナシールド層４としての表面抵
抗値は固着剤４ｂの抵抗値に近づき過ぎてしまう
ことから、その抵抗値を所望値に設定することは
困難であるという問題がある。 However, even if a semiconductive corona shield base material 4a having an appropriate resistance value is used, if the fixing agent 4b is impregnated between the fibers of the corona shield base material 4a, the surface resistance of the corona shield layer 4 will be is too close to the resistance value of the fixing agent 4b, so there is a problem that it is difficult to set the resistance value to a desired value.
本発明の目的は、主絶縁層とコロナシールド層
の界面に空隙を発生させることなく、かつコイル
エンド部のコロナシールド層の抵抗値を所望値に
設定してなる確実なコロナシールドを行うことの
できるコロナシールド法を提供することにある。 An object of the present invention is to provide reliable corona shielding by setting the resistance value of the corona shield layer at the coil end portion to a desired value without creating a void at the interface between the main insulating layer and the corona shield layer. The aim is to provide a corona shield method that can be used.
本発明のコロナシールド法は、上記目的を達成
するため、回転電機巻線のコイル導体の外周に主
絶縁層の基材を巻回する工程と、該主絶縁層のう
ち鉄心のスロツト内に位置される部分の外周に抵
抗導電層を形成する工程と、該抵抗導電層の前記
スロツト出口に位置される端部から延在させて前
記主絶縁層の基材の外周に前記抵抗導電層よりも
高く前記主絶縁層よりも低い表面抵抗率を有する
不連続性繊維からなるコロナシールド基材を巻回
する工程と、該コロナシールド基材の巻回工程の
前又は後に触媒と樹脂を含んでなる繊維結合材で
あつて硬化後の比誘電率が前記主絶縁層の絶縁樹
脂の比誘電率より大きな繊維結合材を前記コロナ
シールド基材に常圧にて含浸又は塗布処理する工
程と、前記全工程を経た後に前記コロナシールド
基材と前記主絶縁層の基材とに同時に絶縁樹脂を
真空含浸処理してコロナシールド層と主絶縁層と
を一体形成する工程とを含んでなるものとしたこ
とにある。
In order to achieve the above object, the corona shielding method of the present invention includes a step of winding a base material of a main insulating layer around the outer periphery of a coil conductor of a rotating electrical machine winding, and a step of winding a base material of a main insulating layer in a slot of an iron core in the main insulating layer. forming a resistive conductive layer on the outer periphery of the portion where the resistive conductive layer is formed, and extending from the end of the resistive conductive layer located at the outlet of the slot to the outer periphery of the base material of the main insulating layer than the resistive conductive layer; a step of winding a corona shield base material made of discontinuous fibers having a high surface resistivity lower than that of the main insulating layer; and a catalyst and a resin before or after the winding step of the corona shield base material. a step of impregnating or coating the corona shield base material at normal pressure with a fiber binder whose dielectric constant after curing is higher than that of the insulating resin of the main insulating layer; After the step, the corona shield base material and the main insulating layer base material are simultaneously vacuum impregnated with an insulating resin to integrally form the corona shield layer and the main insulating layer. It is in.
このような構成とすることにより、即ち、コロ
ナシールド層と主絶縁層の絶縁樹脂の含浸処理を
同一時にかつ真空含浸により行なうことにより、
それらの界面に空隙が生ずるのを防止することが
できる。また上記含浸処理をする前に、コロナシ
ールド基材に繊維結合材を常圧にて含浸または塗
布処理していることから、真空含浸の場合に比べ
て繊維結合材が基材の繊維間に浸入しにくく、一
定の繊維束を包み込むことになるので、半導電性
繊維の直接接触状態が可能な限り保持される。そ
して、その繊維結合材の存在により、後に真空含
浸される絶縁樹脂がそれらの繊維間に浸入するの
を抑制するので、それらの繊維の直接接触状態が
保持される。これによつてコロナシールド層の抵
抗値が大きな値になることなく、所望の値に設定
できることになるのである。
By adopting such a configuration, that is, by performing the impregnation treatment of the insulating resin of the corona shield layer and the main insulating layer at the same time and by vacuum impregnation,
It is possible to prevent voids from forming at the interface between them. In addition, since the corona shield base material is impregnated or coated with the fiber binder at normal pressure before the above impregnation treatment, the fiber binder penetrates between the fibers of the base material compared to vacuum impregnation. Since it is difficult to wrap around a certain fiber bundle, direct contact of the semiconducting fibers is maintained as much as possible. The presence of the fiber binder prevents the insulating resin that will be vacuum-impregnated later from penetrating between the fibers, thereby maintaining the state of direct contact between the fibers. This allows the resistance value of the corona shield layer to be set to a desired value without becoming a large value.
また、繊維結合材として硬化後に主絶縁層の絶
縁樹脂よりも大きい比誘電率となるものを用いた
ことから、繊維結合材が基材の繊維間に浸入した
場合でも繊維間の結合静電容量が大きいため、全
体として抵抗値は低く維持されることになり、繊
維結合材の比誘電率を調整することによつて、所
望の抵抗値を有するコロナシールド層を形成する
ことができる。 In addition, since we used a fiber binder that has a dielectric constant higher than that of the insulating resin of the main insulation layer after curing, even if the fiber binder penetrates between the fibers of the base material, the bonding capacitance between the fibers will increase. Since the resistance value is large, the overall resistance value is maintained low, and by adjusting the dielectric constant of the fiber binding material, a corona shield layer having a desired resistance value can be formed.
以下、本発明の一実施例を第４図について説明
する。コイル導体１、主絶縁層２、導電層３につ
いては第１図に示す従来の固定子コイルエンド部
と同じである。導電層３は103〜105〔Ω〕程度の
抵抗値を有するものである。ここで、基材4aに
は後述する繊維結合材が予め含浸または塗布され
たものが用いられ、主絶縁層２と同一のワニス４
ｃが主絶縁層２と一緒に真空含浸により含浸硬化
せしめ、これによりコロナシールド層４が形成さ
れている。このように、主絶縁層２とコロナシー
ルド層４が一体化されるため、両者の界面に第３
図に示したような空隙５を生ずることがなくな
る。したがつて、コロナ放電により主絶縁層２が
劣化することの無い良好なコロナシールドが得ら
れるのである。
An embodiment of the present invention will be described below with reference to FIG. The coil conductor 1, main insulating layer 2, and conductive layer 3 are the same as those of the conventional stator coil end portion shown in FIG. The conductive layer 3 has a resistance value of about 10 3 to 10 5 [Ω]. Here, the base material 4a is pre-impregnated or coated with a fiber binding material to be described later, and the same varnish 4a as the main insulating layer 2 is used.
c is impregnated and hardened together with the main insulating layer 2 by vacuum impregnation, thereby forming the corona shield layer 4. In this way, since the main insulating layer 2 and the corona shield layer 4 are integrated, a third layer is formed at the interface between them.
This eliminates the formation of voids 5 as shown in the figure. Therefore, a good corona shield can be obtained in which the main insulating layer 2 is not deteriorated by corona discharge.
ここで、上記ワニス４ｃを一体含浸するに際
し、基材４ａに直接ワニス４ｃを含浸または真空
含浸すると、基材４ａを形成している不連続性繊
維間にワニスが浸入し、各繊維間の結合がワニス
によつて遮断され、抵抗値が高くなりすぎる。 Here, when integrally impregnating the varnish 4c with the varnish 4c, if the base material 4a is directly impregnated with the varnish 4c or vacuum impregnated, the varnish will infiltrate between the discontinuous fibers forming the base material 4a, resulting in bonding between each fiber. is blocked by the varnish, and the resistance value becomes too high.
また、基材４ａは不連続性繊維をより合わせた
ものであるから、交流電圧に対しては、第５図に
示すように、各繊維間は容量Ｃのキヤパシタンス
結合していると考えることができる。ここで、浸
入されるワニス４ｃの比誘電率が高ければ容量リ
アクタンスが小さくなり、全体として抵抗値（イ
ンピーダンス）の低減に寄与できるが、一般にワ
ニス等の絶縁樹脂の比誘電率は３〜５であること
から、これにより抵抗値に低減は期待できない。 Furthermore, since the base material 4a is made by twisting discontinuous fibers, it can be considered that each fiber is coupled with a capacitance of capacitance C, as shown in FIG. 5, with respect to AC voltage. can. Here, if the dielectric constant of the varnish 4c to be infiltrated is high, the capacitive reactance will be small and it can contribute to reducing the resistance value (impedance) as a whole, but in general, the dielectric constant of insulating resin such as varnish is 3 to 5. Therefore, it cannot be expected that the resistance value will decrease due to this.
したがつて、例えば、基材４ａの固有抵抗が
108〜1011〔Ωcm〕の時、その表面抵抗は107〜109
〔Ω〕になるようなものを選択すると、108〜1011
〔Ω〕の抵抗値となる。この抵抗値よりも大きす
ぎる場合には、実質的にコロナシールドが無いの
と同じ結果になつてしまい、一方小さずきる場合
には、その抵抗値が導電層３の抵抗値に近づくに
つれて、実質的に該導電層３が延長されたのと同
じ結果になつてしまうのである。 Therefore, for example, the specific resistance of the base material 4a is
When the resistance is 10 8 to 10 11 [Ωcm], the surface resistance is 10 7 to 10 9
If you select something that becomes [Ω], 10 8 ~ 10 11
The resistance value is [Ω]. If the resistance value is too large, the result is essentially the same as not having a corona shield, while if it is too small, as the resistance value approaches the resistance value of the conductive layer 3, In other words, the result is the same as if the conductive layer 3 were extended.
そこで、本実施例では、常圧にて基材４ａに繊
維結合材を含浸または塗布処理し、これによつて
コロナシールド層４の抵抗値を所望値に調整する
ようにしたのである。ここで繊維結合材として
は、硬化後に主絶縁層の絶縁樹脂よりも高い比誘
電率を呈する触媒、樹脂からなるものとする。触
媒とは一般に硬化材、硬化促進材、溶材を含むも
のをいう。また、さらに高い比誘電率のものが望
ましい場合にはチタン等の高誘電率充填材を混入
したものとする。具体的な一例としては、エポキ
シ樹脂10〜50％重量、チタン５〜40％を含んでな
り、硬化後の比誘電率が10〜40のものとする。 Therefore, in this embodiment, the base material 4a is impregnated or coated with a fiber binding material under normal pressure, thereby adjusting the resistance value of the corona shield layer 4 to a desired value. Here, the fiber binding material is made of a catalyst or resin that exhibits a higher dielectric constant than the insulating resin of the main insulating layer after curing. A catalyst generally includes a curing agent, a curing accelerator, and a solvent. If a material with an even higher dielectric constant is desired, a high dielectric constant filler such as titanium may be mixed therein. As a specific example, the material contains 10 to 50% by weight of epoxy resin and 5 to 40% by weight of titanium, and has a dielectric constant of 10 to 40 after curing.
このような繊維結合材を常圧にて基材４ａに含
浸または塗布処理すると、その繊維結合材は基材
４ａの繊維間の全体にわたつて浸入することはな
く、一定の繊維束をより合わせた糸状の部分を包
み込むことになる。したがつて、このように処理
されてなる基材４ａと主絶縁層２を一体にて絶縁
樹脂を真空含浸しても、主絶縁層２の絶縁樹脂は
繊維結合材に遮ぎられて基材４ａの繊維間に浸入
することがない。 When such a fiber binding material is impregnated or applied to the base material 4a under normal pressure, the fiber binding material does not penetrate between the entire fibers of the base material 4a, but twists a certain fiber bundle. It will wrap around the thread-like part. Therefore, even if the base material 4a treated in this way and the main insulating layer 2 are vacuum-impregnated with insulating resin, the insulating resin of the main insulating layer 2 is blocked by the fiber binding material and the base material It does not penetrate between the fibers of 4a.
上述したように、本実施例によれば、主絶縁層
２とコロナシールド層４の界面に空隙が生ずるの
を防止できる。したがつて、コロナ放電により主
絶縁層２が劣化することの無い良好なコロナシー
ルドが得られる。また、基材４ａの繊維間に高抵
抗を呈する主絶縁層２の絶縁樹脂の浸入が繊維結
合材によつて遮ぎられる。これによつてコロナシ
ールド層４の抵抗値は基材４ａおよび基材４ａと
繊維結合材との結合容量Ｃによつて支配されるこ
とになり、繊維結合材として硬化後主絶縁層の絶
縁樹脂よりも比誘電率の高いものを用いているこ
とから、容量Ｃが大となり、容量リアクタンスを
低減することができる。したがつて、繊維結合材
の比誘電率を適宜調整することによつて、コロナ
シールド層の抵抗値を所望の値に容易かつ正確に
設定できるのである。 As described above, according to this embodiment, it is possible to prevent voids from forming at the interface between the main insulating layer 2 and the corona shield layer 4. Therefore, a good corona shield is obtained in which the main insulating layer 2 is not deteriorated by corona discharge. Further, the fiber binding material prevents the insulating resin of the main insulating layer 2, which exhibits high resistance, from penetrating between the fibers of the base material 4a. As a result, the resistance value of the corona shield layer 4 is controlled by the base material 4a and the coupling capacity C between the base material 4a and the fiber binding material, and the insulating resin of the main insulation layer after curing as the fiber binding material Since a material having a higher relative dielectric constant than the above is used, the capacitance C becomes large and the capacitive reactance can be reduced. Therefore, by appropriately adjusting the dielectric constant of the fiber binder, the resistance value of the corona shield layer can be easily and accurately set to a desired value.
なお、前記繊維結合材をコロナシールド基材４
ａに含浸又は塗布する処理は、その基材４ａを主
絶縁層の基材の外周に巻回する前に行つても、後
に行つてもよく、要はコロナシールド基材４ａと
主絶縁層の基材とに絶縁樹脂を真空含浸する前で
あればよい。 Note that the fiber binding material is used as the corona shield base material 4.
The process of impregnating or coating a may be performed before or after winding the base material 4a around the base material of the main insulating layer. It may be applied before vacuum impregnating the base material with the insulating resin.
ここで、上述した効果を、さらに第６図を用い
て説明する。第６図において、ｘは導電層３の端
からコイルエンド方向のコロナシールド層４の距
離であり、ｘ＝l0はコロナシールド層４の端であ
る。図中ＣおよびＤはそれぞれ基材４ａに直接ワ
ニス４ｃを真空含浸した場合と、繊維結合材を前
処理した後ワニス４ｃを真空含浸した場合の電位
分布曲線である。前者の場合、抵抗値がワニス浸
透分だけ高くなり、図中Ｃのようコロナシールド
層４の導電層３側の端部の電位傾度が高くなる。
一方、後者の場合は、抵抗値の増大が防止され、
図中Ｄのように電位傾度の低いコロナシールドが
得られるのである。このＣ，Ｄの違いは前述した
ように、基材４ａのワニス処理後の抵抗値の違い
によるものであり、前処理の有無により自由にコ
ロナシールド部の電位傾度を変えることができる
のである。また、第７図に示すように、必要によ
りコロナシールド層４の導電層３側のＥ部のみに
繊維結合材を前処理して第８図のように電位分布
を非線形にすることも可能であり、コストの低減
となる。 Here, the above-mentioned effects will be further explained using FIG. 6. In FIG. 6, x is the distance of the corona shield layer 4 from the end of the conductive layer 3 in the coil end direction, and x=l 0 is the end of the corona shield layer 4. In the figure, C and D are potential distribution curves when the base material 4a is vacuum-impregnated directly with the varnish 4c, and when the varnish 4c is vacuum-impregnated after pretreatment of the fiber binding material, respectively. In the former case, the resistance value increases by the amount of varnish penetration, and the potential gradient at the end of the corona shield layer 4 on the conductive layer 3 side increases as shown by C in the figure.
On the other hand, in the latter case, an increase in resistance value is prevented,
As shown in D in the figure, a corona shield with a low potential gradient can be obtained. As described above, the difference between C and D is due to the difference in resistance value after the varnish treatment of the base material 4a, and the potential gradient of the corona shield portion can be freely changed depending on the presence or absence of pretreatment. Furthermore, as shown in FIG. 7, if necessary, it is also possible to pre-treat only the portion E of the corona shield layer 4 on the conductive layer 3 side with a fiber binder to make the potential distribution non-linear as shown in FIG. Yes, this reduces costs.
前記実施例で用いた繊維結合材として、エポキ
シ樹脂10〜50％、チタン等の高誘電率充填材５〜
40％を含み、硬化後10〜40の比誘電率を有する樹
脂を用いた場合には、各繊維間に繊維結合材が浸
入した場合でも、各繊維間を比誘電率の比較的大
きい結合材で結合されたことになり、この場合、
交流電圧に対して容量リアクタンスは比較的小さ
く、繊維結合材の各繊維間への浸入の大小にかか
わらず、基材４ａの抵抗値107〜109〔Ω〕を維持
した安定した抵抗値を有するコロナシールドが得
られる。 The fiber binding materials used in the above examples include 10 to 50% epoxy resin and 5 to 50% high dielectric constant filler such as titanium.
40% and has a relative permittivity of 10 to 40 after curing, even if the fiber binder penetrates between each fiber, the binder with a relatively high relative permittivity will connect between each fiber. In this case,
The capacitive reactance is relatively small with respect to AC voltage, and regardless of the amount of penetration of the fiber binding material between each fiber, the base material 4a maintains a stable resistance value of 10 7 to 10 9 [Ω]. A corona shield is obtained.
以上説明したように、本発明によれば、コロナ
シールド層と主絶縁層の絶縁樹脂の含浸処理を真
空により同一時に行なうようにしたことから、そ
れらの界面に空隙が生ずるのを防止することがで
き、コロナ放電により主絶縁層が劣化することの
ない、良好なコロナシールド層が得られる。
As explained above, according to the present invention, since the impregnation treatment of the insulating resin of the corona shield layer and the main insulating layer is performed at the same time by vacuum, it is possible to prevent the formation of voids at the interface between them. A good corona shield layer is obtained in which the main insulating layer is not deteriorated by corona discharge.
また、コロナシールド基材に硬化後の比誘電率
が主絶縁層の絶縁樹脂よりも大きい繊維結合材を
予め常圧にて含浸又は塗布処理していることか
ら、繊維結合材がコロナシールド基材の繊維間に
浸入しにくく、半導電性繊維の直接接触状態が可
能な限り保持されるとともに、部分的に繊維間に
浸入したとしても繊維間の結合容量Ｃが大きく、
また繊維結合材の存在により、後に真空含浸され
る絶縁樹脂がそれらの繊維間に浸入するのを抑制
し、それらの繊維の直接接触状態が保持される。
その結果、コロナシールド層の抵抗値を増大させ
ることなく所望の値に容易にかつ正確に設定でき
る。 In addition, since the corona shield base material is pre-impregnated or coated with a fiber binder whose dielectric constant after curing is higher than that of the insulating resin of the main insulating layer, the fiber binder is applied to the corona shield base material. It is difficult to penetrate between the fibers, and the direct contact state of the semiconductive fibers is maintained as much as possible, and even if it partially penetrates between the fibers, the coupling capacity C between the fibers is large.
Furthermore, the presence of the fiber binder prevents the insulating resin that will be vacuum-impregnated later from penetrating between the fibers, and maintains the state of direct contact between the fibers.
As a result, the resistance value of the corona shield layer can be easily and accurately set to a desired value without increasing it.
第１図および第２図は繊維基材を用いた従来の
コロナシールドを示す縦断面図、第３図は第２図
のＡ部の拡大部分断面図、第４図は本発明の一実
施例によるコロナシールドを示す縦断面図、第５
図は第４図のＢ部の拡大部分説明図、第６図は本
発明によるコロナシールドの電位分布を示す特性
図、第７図は本発明によるコロナシールドの他の
実施例を示す縦断面図、第８図は第７図のコロナ
シールドの電位分布を示す特性図である。
１…コイル導体、２…主絶縁層、３…導電層、
４…コロナシールド層、４ａ…基材、４ｃ…ワニ
ス。
FIGS. 1 and 2 are longitudinal sectional views showing a conventional corona shield using a fiber base material, FIG. 3 is an enlarged partial sectional view of section A in FIG. 2, and FIG. 4 is an embodiment of the present invention. 5th longitudinal cross-sectional view showing the corona shield according to
The figure is an enlarged partial explanatory view of part B in Fig. 4, Fig. 6 is a characteristic diagram showing the potential distribution of the corona shield according to the present invention, and Fig. 7 is a longitudinal cross-sectional view showing another embodiment of the corona shield according to the present invention. , FIG. 8 is a characteristic diagram showing the potential distribution of the corona shield of FIG. 7. 1... Coil conductor, 2... Main insulating layer, 3... Conductive layer,
4... Corona shield layer, 4a... Base material, 4c... Varnish.
Claims (1)
の基材を巻回する工程と、該主絶縁層のうち鉄心
のスロツト内に位置される部分の外周に抵抗導電
層を形成する工程と、該抵抗導電層の前記スロツ
ト出口に位置される端部から延在させて前記主絶
縁層の基材の外周に前記抵抗導電層よりも高く前
記主絶縁層よりも低い表面抵抗率を有する不連続
性繊維からなるコロナシールド基材を巻回する工
程と、該コロナシールド基材の巻回工程の前又は
後に触媒と樹脂を含んでなる繊維結合材であつて
硬化後の比誘電率が前記主絶縁層の絶縁樹脂の比
誘電率より大きな繊維結合材を前記コロナシール
ド基材に常圧にて含浸又は塗布処理する工程と、
前記全工程を経た後に前記コロナシールド基材と
前記主絶縁層の基材とに同時に絶縁樹脂を真空含
浸処理してコロナシールド層と主絶縁層とを一体
形成する工程とを含んでなる回転電機巻線端部の
コロナシールド法。 ２ 特許請求の範囲第１項記載のコロナシールド
法において、前記繊維結合材としてポリエチレン
樹脂10〜50％重量、チタン等の高誘電率充填材15
〜40％重量を含み、硬化後10〜40の比誘電率を有
する樹脂を用いたことを特徴とする回転電機巻線
端部のコロナシールド法。 ３ 特許請求の範囲第１項記載のコロナシールド
法において、前記コロナシールド基材の軸方向長
さの一部分のみに前記繊維結合材を含浸又は塗布
処理することを特徴とする回転電機巻線端部のコ
ロナシールド法。[Claims] 1. A step of winding a base material of a main insulating layer around the outer periphery of a coil conductor of a rotating electric machine winding, and a step of winding a base material of a main insulating layer around the outer periphery of a coil conductor of a rotating electrical machine winding, and a resistive conductive layer on the outer periphery of a portion of the main insulating layer located in a slot of an iron core. forming a layer higher than the resistive conductive layer and lower than the main insulating layer extending from the end of the resistive conductive layer located at the slot exit to the outer periphery of the base material of the main insulating layer; A process of winding a corona shield base material made of discontinuous fibers having surface resistivity, and a fiber binding material containing a catalyst and a resin before or after the winding process of the corona shield base material, which is cured. impregnating or coating the corona shield base material with a fiber binder having a dielectric constant larger than that of the insulating resin of the main insulating layer at normal pressure;
A rotating electrical machine comprising the step of simultaneously vacuum impregnating the corona shield base material and the base material of the main insulating layer with an insulating resin after passing through all of the above steps to integrally form the corona shield layer and the main insulating layer. Corona shielding method for winding ends. 2. In the corona shield method described in claim 1, the fiber binding material is polyethylene resin 10 to 50% by weight, and a high dielectric constant filler such as titanium.
A method for corona shielding the ends of windings of rotating electric machines, characterized by using a resin containing ~40% by weight and having a dielectric constant of 10 to 40 after curing. 3. In the corona shield method according to claim 1, the winding end portion of a rotating electric machine is characterized in that only a portion of the axial length of the corona shield base material is impregnated or coated with the fiber binding material. Corona Shield Law.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15677279A JPS5681054A (en) | 1979-12-05 | 1979-12-05 | Corona shielding method |
| ZA00807374A ZA807374B (en) | 1979-12-05 | 1980-11-26 | Corona shielding method of end part of stator coil in rotating electric machine |
| AU64966/80A AU527369B2 (en) | 1979-12-04 | 1980-12-02 | Corona shielding |
| DE3045462A DE3045462C2 (en) | 1979-12-05 | 1980-12-02 | Process for the production of a corona protection layer at the slot exit of a stator winding conductor of an electrical machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15677279A JPS5681054A (en) | 1979-12-05 | 1979-12-05 | Corona shielding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5681054A JPS5681054A (en) | 1981-07-02 |
| JPH0231577B2 true JPH0231577B2 (en) | 1990-07-13 |
Family
ID=15634971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15677279A Granted JPS5681054A (en) | 1979-12-04 | 1979-12-05 | Corona shielding method |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5681054A (en) |
| AU (1) | AU527369B2 (en) |
| DE (1) | DE3045462C2 (en) |
| ZA (1) | ZA807374B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7621579B2 (en) | 1996-08-16 | 2009-11-24 | Rosen Entertainment Systems, L.P. | Display unit |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19634578A1 (en) * | 1996-08-27 | 1998-03-12 | Vem Elektroantriebe Gmbh | Glow protection device for HV rotary electrical machine stator winding ends |
| DE19839285C1 (en) * | 1998-08-28 | 2000-04-27 | Siemens Ag | Glow protection tape |
| EP2764519B1 (en) * | 2011-12-15 | 2015-10-28 | Siemens Aktiengesellschaft | Method for producing a corona shield, fast-curing corona shield system, and electric machine |
| PT2822153T (en) * | 2013-07-03 | 2017-07-13 | Alstom Renewable Technologies | End winding corona protection in an electric machine |
| DE102014203740A1 (en) * | 2014-02-28 | 2015-09-03 | Siemens Aktiengesellschaft | Corona protection system, in particular external corona protection system for an electrical machine |
| US20250364860A1 (en) * | 2024-05-23 | 2025-11-27 | Ge Aviation Systems Llc | Electric machine and method for electrically insulating portions of an electric machine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1118290B (en) * | 1958-05-02 | 1961-11-30 | Messwandler Bau Gmbh | Insulating tape with an electrically conductive coating for electrostatic shields or conductive inserts |
| CH436455A (en) * | 1966-05-13 | 1967-05-31 | Bbc Brown Boveri & Cie | Process for the production of high-voltage coil windings for electrical machines |
| CH486795A (en) * | 1968-08-19 | 1970-02-28 | Bbc Brown Boveri & Cie | Process for the production of a multi-layer high-voltage winding in the stator slots of an electrical machine |
| CH521661A (en) * | 1968-08-23 | 1972-04-15 | Siemens Ag | Insulation covering strip - with limited conductivity esp for operating at high temp |
| DE1919422A1 (en) * | 1969-04-17 | 1970-11-05 | Licentia Gmbh | External corona protection for high-voltage windings of electrical machines |
-
1979
- 1979-12-05 JP JP15677279A patent/JPS5681054A/en active Granted
-
1980
- 1980-11-26 ZA ZA00807374A patent/ZA807374B/en unknown
- 1980-12-02 AU AU64966/80A patent/AU527369B2/en not_active Ceased
- 1980-12-02 DE DE3045462A patent/DE3045462C2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7621579B2 (en) | 1996-08-16 | 2009-11-24 | Rosen Entertainment Systems, L.P. | Display unit |
Also Published As
| Publication number | Publication date |
|---|---|
| AU6496680A (en) | 1981-07-09 |
| DE3045462A1 (en) | 1981-06-11 |
| AU527369B2 (en) | 1983-03-03 |
| ZA807374B (en) | 1981-11-25 |
| JPS5681054A (en) | 1981-07-02 |
| DE3045462C2 (en) | 1985-04-04 |
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