JPS58123349A - Stator for rotary electric machine - Google Patents

Abstract

PURPOSE:To improve the air cooling effect of the bottom of a slot of a core coil by providing two types of long and short spacers between the end face of a stator core and a core retaining plate, providing a wind limiting plate at the side of the long spacers, thereby forming an air gap between the plate and the side face of the short spacer. CONSTITUTION:The end face of a stator core 1, which is formed by laminating thin sector-shaped iron plates, is retained by a core retaining plate 3 through a long spacer 5a which is mounted between the teethed part 1a of a core coil and a core outer periphery 1c and a short spacer 5b which is mounted between the bottom 1b of a core coil slot and the core outer periphery 1c, and a shielding plate 4 is provided at the prescribed interval to form an air passage with the plate 3. An L-shaped wind limiting plate 6 which forms an air gap between the side face of the long spacer 5a and the side face of the short spacer 5b is mounted. In this manner, cooling gas 9a is contacted directly with the short spacer 5b of the bottom 1b of the core coil slot, and the end face of the core of this part can be cooled by thermal conduction through the short spacer 5b.

Description

【発明の詳細な説明】 本発明は回転電機の固定子に係シ、特に鉄心端のスμッ
ト底部の過熱を防止する改良した固定子に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator for a rotating electric machine, and more particularly to an improved stator that prevents overheating of the bottom of the slot at the end of the iron core.

大容量タービン発電機などの回転電機においては、容量
の増大に伴い固定子鉄心端の電機子コイルスロット肯先
部および同スロット底部の漏洩磁束による鉄損が増加す
るので温度上昇が高くなシ許容限度に近づいている。第
１図はタービン発電機の固定子鉄心端部を示す縦断面図
で、第２図は第１図のＩＩ矢視横断面図で従来技術によ
る場合を示す。（１）は扇形の電気鉄板を積層して形成
した固定子鉄心、（２）Ｆｉ固定子鉄心（１）のスロッ
トに装着した電機子コイル、（３）は固定子鉄心（１）
を軸方向に押圧する鉄心押え板、（４）は発電機の運転
時界磁コイル（図示されていない）の電流により紡起さ
れた漏洩磁束によって鉄心押え板（３）が加熱されるの
を防止する為のシールド板である。なお、鉄心押え板（
３）とシーシト板（４）との間はシールド板の冷却を計
るため一定の間隔を作シ通風路を形成している。（５）
は固定子鉄心（１）と鉄心押え板（３）との間に介在す
る外側間隔片でおって、鉄心コイル歯部（Ｘａ）と鉄心
外周部（ＩＣ）との間に設置された長い外側間隔片（５
ａ）と、鉄心コイルスロット底（１ｂ）と鉄心外周部（
ＩＣ）との間に設置された短かい外側間隔片（５ｂ）と
の２種類がある。（６）はＬ形通風制限板であシ外側間
隔片（５ｂ）に堆付けられている。前記の通シ、発電機
の運転時界磁コイルの電流によシ誘起された磁束の一部
は、前記シーシト板（４）で覆われていない固定子鉄心
（１）の端部にも入射しうず電流が生じ発熱する。この
うず電流による発熱の密度は固定子鉄心コイル歯部（１
ａ）と同鉄心コイ〜スロツ）　底（ｔｂ）が特に大きい
。この熱を除去するために発電機機内冷却ガス（９）は
前記シーシト板（４）と鉄心押え板（３）間の冷却ガス
（９ｃ）′ｔ−も考慮して、第１図および第２図に示す
ように外側間隔片（５ｂ）の両側面にＬ形通風制限板（
６）をほぼシールド板の内径と同一程度の位置になるよ
うに設け、鉄心端面と鉄心押え板との間を通風制限しつ
つ外側間隔片（５ａ）ｌｋ側面とＬ形通風制限板（６）
との間隔ａ望を通って鉄心端面と鉄心外周部に向う冷却
ガス（９ａ）と固定子コイル側壁面と外側間隔片（５ｂ
）の側面との間を固定子鉄心（１）と回転子αＱとの間
のエヤーギャツ７’ＱＩ）方向に向う冷却ガス（９ｂ）
とに分れて流れる。In rotating electric machines such as large-capacity turbine generators, as the capacity increases, iron loss due to leakage magnetic flux at the end of the armature coil slot at the end of the stator core and the bottom of the slot increases, so a high temperature rise is acceptable. It's approaching its limit. FIG. 1 is a longitudinal cross-sectional view showing the end of a stator core of a turbine generator, and FIG. 2 is a cross-sectional view taken in the direction of the arrow II in FIG. 1, and shows a conventional technique. (1) is a stator core formed by laminating fan-shaped electrical iron plates, (2) is an armature coil installed in the slot of Fi stator core (1), (3) is a stator core (1)
The core retainer plate (4) presses the core in the axial direction, and the core retainer plate (4) prevents the core retainer plate (3) from being heated by the leakage magnetic flux spun by the current of the field coil (not shown) during generator operation. This is a shield plate to prevent this. In addition, the iron core holding plate (
3) and the shield plate (4), a ventilation passage is formed at a constant interval to cool the shield plate. (5)
is an outer spacing piece interposed between the stator core (1) and the core holding plate (3), and is a long outer spacer installed between the core coil teeth (Xa) and the core outer circumference (IC). Spacing piece (5
a), the core coil slot bottom (1b) and the core outer periphery (
There are two types: a short outer spacing piece (5b) installed between the IC) and the IC). (6) is an L-shaped ventilation restriction plate attached to the outer spacer piece (5b). During the operation of the generator, a part of the magnetic flux induced by the current in the field coil also enters the end of the stator core (1) that is not covered with the sheet plate (4). Eddy current is generated and heat is generated. The density of heat generated by this eddy current is the stator core coil teeth (1
a) and the same iron core carp ~ slot) The bottom (tb) is especially large. In order to remove this heat, the cooling gas (9) inside the generator is adjusted as shown in Figs. As shown in the figure, L-shaped ventilation restriction plates (
6) so that the position is approximately the same as the inner diameter of the shield plate, and while restricting the ventilation between the core end face and the core holding plate, the outer spacing piece (5a), the lk side surface and the L-shaped ventilation restriction plate (6) are installed.
The cooling gas (9a) is directed toward the core end face and the core outer circumference through the space a and the stator coil side wall face and the outer spacing piece (5b).
cooling gas (9b) flowing in the air gap 7'QI) between the stator core (1) and the rotor αQ
It flows in two parts.

固定子鉄心端の鉄心コイル歯部（１ａ）では回転子（Ｉ
の回転の影響を受けて冷却ガスの風量および流速が大き
く、又直接冷却ガスと接触している表置が大亀いので冷
却特性が比較的良好である。一方固定子鉄心端の鉄心ス
ロット底ｇ（ｌｂ）では冷却ガスの流速が低く、特に第
２図の冷却ガスの流れ（９ａ）に示すように冷却ガスが
流れようとすると鉄心スロット底部ではこの冷却ガスが
うすを巻き外側間点があった。The rotor (I
Due to the influence of the rotation of the cooling gas, the air volume and flow velocity of the cooling gas are large, and the surface area that is in direct contact with the cooling gas has a large diameter, so the cooling characteristics are relatively good. On the other hand, the flow velocity of the cooling gas is low at the core slot bottom g (lb) at the stator core end, and especially when the cooling gas tries to flow as shown in the cooling gas flow (9a) in Figure 2, the cooling gas at the core slot bottom g (lb) is low. There was a point between the outer edges of the gas.

本発明は前記欠点に鑑み、特に鉄心端部の鉄心コイシス
ロット底の通風冷却特性を改善し、過熱を防止するよう
にした回転電機の固定子を提供することを目的とする。In view of the above-mentioned drawbacks, it is an object of the present invention to provide a stator for a rotating electrical machine that is particularly designed to improve the ventilation cooling characteristics of the bottom of the core slot at the end of the core, thereby preventing overheating.

以下本発明の一実施例について図面を参照して説明する
。第３図は第１図のＩ−１矢視横断面図で、固定子鉄心
のスロット底（１ｂ）と外周部（ＩＣ）との間に設置さ
れた外側間隔片（５ｂ）にはＬ形通風制限板を一切取付
けず、鉄心コイルスロット歯部（１ａ）と外周部（ＩＣ
）との間に設置される外側間隔片（５ａ）にＬ形通風制
限＆　（６）を取付ける。An embodiment of the present invention will be described below with reference to the drawings. Figure 3 is a cross-sectional view taken along the I-1 arrow in Figure 1. Without installing any ventilation restriction plates, the iron core coil slot teeth (1a) and the outer periphery (IC
) Attach the L-shaped ventilation restriction & (6) to the outer spacing piece (5a) installed between the

このような構造にすると発電機の運転時には第３図の（
９ａ）に示す如く冷却ガスが面接的に鉄心コイシス四ッ
ト底部（ｘｂ）の外側間隔片（５ｂ）に接触し、この部
分における鉄心端面が外側間隔片（５ｂ）ｔ−介して熱
伝導によシ冷却されるのでこの部の冷却特性が著しく改
善される。With this structure, when the generator is operating, the condition shown in Figure 3 (
As shown in 9a), the cooling gas contacts the outer spacing piece (5b) of the four-piece bottom (xb) of the core coil, and the end face of the core at this part conducts heat through the outer spacing piece (5b) t-. Since it is well cooled, the cooling characteristics of this part are significantly improved.

第４図はスロット底部（ｌｂ）　Ｋおける温度分布を表
わす曲線で、従来構造の場合（曲線人）に比し本発明に
よる場合（＃線Ｂ）の方が嬉かに良好であることを示宅
てりる。Figure 4 is a curve representing the temperature distribution at the slot bottom (lb) K, and shows that the case with the present invention (# line B) is much better than the case with the conventional structure (curve line). I'm home.

以上のように本発明によれば大容量タービン発電機等で
過熱が懸念される固定子鉄心端面の鉄心コイルスレット
底部の冷却を改善することが、大幅な構造変更を伴なわ
ずに可能となるというすぐれた効果が得られる。As described above, according to the present invention, it is possible to improve the cooling of the bottom of the core coil slet on the end face of the stator core, where overheating is a concern in large-capacity turbine generators, etc., without major structural changes. An excellent effect can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

ＩＩＩ図は従来の回転電機の固定子鉄心端部を示す従断
面図、第２図は第１図の１−■矢視横断面と本発明によ
る場合のスロット底部温度分布との比較を示した曲線図
である。　− １・・・固定子鉄心、ｌａ・・・鉄心スロット一部、１
ｂ・・鉄心スロット底部、ＩＣ・・・鉄心外周部、３・
・・鉄心押え板、　　　５・・・外側間隔片、５ａ・・
・長い外側間隔片、５ｂ・・・短い外側間隔片、６・・
・Ｌ形通風制限板。 （７３１７）代理人弁理士　則　近　憲　佑（ほか１名
）第１１ ７ 第２ｓFigure III is a secondary sectional view showing the end of the stator core of a conventional rotating electric machine, and Figure 2 is a comparison between the cross section taken in the direction of arrows 1-■ in Figure 1 and the temperature distribution at the bottom of the slot according to the present invention. It is a curve diagram. - 1... Stator core, la... Core slot part, 1
b... Core slot bottom, IC... Core outer periphery, 3.
... Core holding plate, 5 ... Outer spacing piece, 5a...
・Long outer spacing piece, 5b...Short outer spacing piece, 6...
・L-shaped ventilation restriction plate. (7317) Representative Patent Attorney Kensuke Chika (and 1 other person) No. 11 7 2s

Claims (1)

【特許請求の範囲】[Claims] 扇形薄鉄板を積層して形成し九固定子鉄心の端面を、鉄
心スロット底部と鉄心外周部間の短い外側間隔片と、鉄
心歯部と鉄心外周部間の長い外側間隔片との二種類の間
隔片を介して鉄心押え板にて押える構造の回転電機の固
定子において、前記長い外側間隔片の側面に通風制限板
を前記短い外側間隔片の側面との間に空＊ｉ−作るよう
に取付けたことｔ−特徴とする回転電機の固定子。The end face of the stator core is formed by laminating fan-shaped thin iron plates, and the end face of the stator core is divided into two types: a short outer spacer piece between the core slot bottom and the core outer periphery, and a long outer spacer piece between the core teeth and the core outer periphery. In a stator of a rotating electrical machine having a structure in which a core holding plate is used to press a spacer through a spacer piece, a ventilation restricting plate is provided on a side surface of the long outer spacer piece and a space is created between it and the side face of the short outer spacer piece. Installed t-Characteristic stator of rotating electric machine.