JPS5895961A - Manufacture of squirrel-cage rotor - Google Patents

Abstract

PURPOSE:To obtain a rotor having high conductivity without crack by disposing plates having a melting point lower than the molten metal for conductor to be cast and the same shape as a laminated core planewise at both ends of laminating direction of the core and filling molten metal in the slot of the core. CONSTITUTION:Before molten metal layer is filled in molds 2, 3, cushion plates 4, 5 are respectively disposed at both ends in laminating direction of a laminated core 1. Thereafter, molten metal is filled in the space formed by the molds 2, 3, the core 1 and the plates 4, 5, thereby forming end rings 6, 7 and a bar 8. In this case, the plates 4, 5 are semi-molten or completely molten by the heat of the molten metal filled in the space, and no external force is applied to the end rings 6, 7 which are solidified slowly and the bar 8 having small sectional area, and a crack can accordingly be effectively prevented.

Description

【発明の詳細な説明】 ／）　発明の技術分野 本発明は、鋼または銅系合金により導体を鋳造するかご
形回転子の製造方法に係り、特に導体の通電性を阻害す
る亀裂の発生を防止するのに好適なかご形回転子の製造
方法に関する。[Detailed Description of the Invention] /) Technical Field of the Invention The present invention relates to a method for manufacturing a squirrel cage rotor in which a conductor is cast from steel or a copper-based alloy, and in particular to a method for preventing the occurrence of cracks that impede electrical conductivity of the conductor. The present invention relates to a method of manufacturing a squirrel cage rotor suitable for

Ｊ）　発明の技術的背景とその問題点 一般に鋳造によるかご形回転子は、その導体部を純アル
ミニウムまたはアル１系合金をグイキャスト法等により
鋳造して構成されるのが通例である。しかし、省資源、
省エネルギの観点から、近年回転電機に対しても小型化
、高特性化の要錆が高まってきている。この要求に応え
るためには低損失特性の導体が必要とされるが、このよ
うな導体材料としては、純アルミニウムやアルミ系合金
よりも導電率が優れた純銅また社鋼系合金等の銅系材料
が挙げられる。なかでも純銅は特に導電率のよい材料で
あゐが、鋳造時にエンドリングおよびパ一部分に通電性
を阻害する亀裂が発生して回転子の機能を果さないとい
う欠点がある。また銅系合金においても、純銅はとでは
ないが亀裂が発生して導電特性を損なうおそれがある。J) Technical background of the invention and its problems In general, a cast squirrel cage rotor is usually constructed by casting its conductor portion from pure aluminum or an Al-1 alloy by a gui-casting method or the like. However, resource saving,
From the viewpoint of energy saving, there has been an increasing demand for rotating electric machines to be smaller in size and have higher characteristics in recent years. In order to meet this demand, conductors with low loss characteristics are required, and such conductor materials include copper-based materials such as pure copper and steel-based alloys, which have better conductivity than pure aluminum and aluminum-based alloys. Examples include materials. Among these, pure copper is a material with particularly good electrical conductivity, but it has the disadvantage that during casting, cracks occur in the end ring and part of the pawl that impede electrical conductivity, making it unable to function as a rotor. Also, in copper-based alloys, although not pure copper, cracks may occur and the conductive properties may be impaired.

そこで従来は、銅バーを用いるロータについては、鋳造
以外の方法９例えば鉄心スロット内に引抜きバーを打ち
込み、その端面を銀ロー付けする等の方法により回転子
を製造しているが、この種の方法では生産性に大きな問
題がある。Conventionally, rotors using copper bars have been manufactured by a method other than casting9, such as driving a drawn bar into the core slot and brazing the end face with silver. There is a big problem with productivity with this method.

ところで、純銅あるいけ銅系合金の鋳造亀裂は、金型の
拘束により凝固進行中の金属の自由な収縮が妨げられる
ことによるもので、凝固の遅いエンドリング部および断
面積の小さいパ一部に金製の拘束力が集中し、亀裂発生
に到るものである。またミクロ的な面から、酸素の存在
は凝固を遅らせ、その結果酸素の存在する部分は亀裂が
発生し易い状態となる。By the way, casting cracks in pure copper or copper-based alloys are caused by the restriction of the mold, which prevents free contraction of the metal during solidification. The binding force of the metal concentrates, leading to cracks. Furthermore, from a microscopic point of view, the presence of oxygen delays solidification, and as a result, the portion where oxygen exists becomes susceptible to cracking.

そこで一部では、酸素の存在を重視し純銅ＫＺｎ、　Ｃ
ｒ、　Ｚｒ等の元素を添加して酸素を酸化物の状態にす
る方法が採られている。また前記元素は結晶粒の微細化
に対しても有効であり、この面からの亀裂防止も図られ
ている。Therefore, some places emphasize the presence of oxygen and use pure copper KZn, C
A method of adding elements such as r and Zr to convert oxygen into an oxide state has been adopted. The above elements are also effective in making crystal grains finer, and cracks can be prevented from this aspect.

しかしながら、これらの元素を添加するととけ導電率を
低下させることを意味し、純銅の特性を妨げることにな
る。またこれらの元素は凝固進行中もしくは凝固金属の
自由な収縮に対しては何等寄与しておらず、根本的な亀
豐肪止方法とは云えない。However, the addition of these elements means that they melt and lower the electrical conductivity, which interferes with the properties of pure copper. Furthermore, these elements do not contribute in any way to the progress of solidification or to the free contraction of the solidified metal, so it cannot be said to be a fundamental method for fat retention.

このように銅系合金、なかでも純銅は優れた導電率を有
し回転子導体への適用が望まれているが、決定的な鋳造
亀裂防止方法がないため充分な実用化がなされていない
。As described above, copper-based alloys, especially pure copper, have excellent electrical conductivity and are desired to be applied to rotor conductors, but they have not been fully put into practical use because there is no definitive method for preventing casting cracks.

ｊ）発明の目的 本発明はかかる現況に鑑みなされたもので、その目的と
するところは、凝固金属の自由な収縮を促して亀裂がな
く高導電率の回転子を得ることができるかご形回転子の
製造方法を提供すゐにある。j) Purpose of the Invention The present invention was made in view of the current situation, and its purpose is to provide a squirrel-cage type rotor capable of promoting free contraction of solidified metal to obtain a rotor with no cracks and high conductivity. We are here to provide a method for manufacturing children.

ダ）　発明の構成 本発明は、積層鉄心の積層方向両端部に、鋳造すべき導
体部用の溶湯よりも低融点で積層鉄心と平面的に同形状
の板をそれすれ配置して積層鉄心のスロット内に前記溶
湯を注入することを４１徽とする。D) Structure of the Invention The present invention provides a laminated core by arranging plates having a melting point lower than that of the molten metal for the conductor portion to be cast and having the same planar shape as the laminated core at both ends in the lamination direction of the laminated core. Injecting the molten metal into the slot is referred to as step 41.

り　発明の実施態様 以下本発明実施の１態様を図面を参照して説明する。Embodiments of the invention One embodiment of the present invention will be described below with reference to the drawings.

図において／ｉｊ積層方向にスロッ）／ｓを有する積層
鉄心であり、この積層鉄心／Ｆｉ金臘コ、３内に配置さ
れ、積層鉄心ｌの積層方向両端部、すなわち図中上下端
部には、積層鉄心ｌと平面的に同形状のクッシｌン板亭
、３がそれぞれ配されている。このクツシ曹ン板＃、　
　ｔｒｉ、鋳造される導体部の材質である純銅あるいは
銅系合金よりも融点が低い材質１例えばＰｂ、Ｚｍある
いＩｆｉ８１１等で構成されている。そして、金雛コ、
Ｊ、積層鉄心／およびクッシ冒ン板亭、３で形成される
空間には、純銅あるいは銅系合金の溶融金属が注入され
、エンドリング部４．りおよびパ一部ｔがそれぞれ形成
されるよう罠なっている。In the figure, it is a laminated core with slots /s in the lamination direction, and is placed in the laminated core /Fi gold plate 3, and at both ends in the lamination direction of the laminated core l, that is, at the upper and lower ends in the figure. , and a cushion plate 3 having the same planar shape as the laminated iron core 1 are arranged. This shoe board #,
tri, is made of a material 1 having a lower melting point than pure copper or a copper-based alloy, which is the material of the conductor part to be cast, such as Pb, Zm, or Ifi811. And Kin Hinako,
A molten metal of pure copper or a copper-based alloy is injected into the space formed by the laminated iron core/and the bushing plate 3, and the end ring part 4. The trap is such that a part t and a part t are respectively formed.

以上の構成において製造に際しては、まず金型コ、３内
に溶融金属を注入する前に、積層鉄心ｌの積層方向両端
部にクッシ■ン板４１．　　ｓをそれぞれ配置する。そ
してその後、金型コ、Ｊと積層鉄心ｌ、クッシ曹ン板亭
、Ｓとにより形成される空間ＫｆＩＩ！融金属を注入し
てエンドリング部４．りおよびパ一部ｔを形成する。When manufacturing the above configuration, first, before injecting molten metal into the mold 3, cushion plates 41. Place s respectively. After that, the space KfII formed by the mold KO, J, the laminated iron core 1, the Kusshi Soon board, and S! Inject the molten metal into the end ring section 4. and form a part t.

この際、積層鉄心ｌの両端部ＫＩＩ′ｉクッシ１ン板参
、３が配されているので、空間内に注入された溶融金属
の熱によりクッシ冒ン板参、ｊが半溶融もしくは完全な
溶融状態となり、エンドリング部４、りおよびパ一部ｔ
の純銅、鋼系合金の凝固。At this time, since the two ends of the laminated iron core l are provided with the bushes 1 and 3 at both ends, the heat of the molten metal injected into the space causes the bushes, j to become semi-molten or completely melted. It becomes a molten state, and the end ring part 4, the rim and the part t
Solidification of pure copper and steel alloys.

冷却収縮が拘束のない状態で可能となる。この結果、凝
固の遅いエンドリング部６，７および断面積の小さいパ
一部ｌに対して外力が作用することはなく、亀裂を有効
に防止することができる。Cooling shrinkage is possible without constraints. As a result, no external force is applied to the end ring portions 6, 7, which solidify slowly, and the pawl portion 1, which has a small cross-sectional area, and cracks can be effectively prevented.

またクッシ■ン板参、ｊは、純銅、鋼系合金の導電率に
対して影響の少ない素材で形成されており、しかも、か
ご形回転子の全体的損失特性に対して影響の少ないエン
ドリング部１，７に配されているので、電気的特性に悪
影響を及ぼすこともない。In addition, the cushion plate, j, is made of a material that has little effect on the electrical conductivity of pure copper or steel-based alloys, and is also made of an end ring that has little effect on the overall loss characteristics of the squirrel cage rotor. Since it is arranged in parts 1 and 7, it does not have any adverse effect on the electrical characteristics.

６）　発明の詳細 な説明したように本発明によれば、かご形回転子導体部
を純銅、銅系合金により鋳造しても、亀裂の発生および
電気的特性の低下を有効に防止することができる。これ
により、小型化、高特性化さねた回転電機を得ることか
できる。6) As described in detail, according to the present invention, even if the squirrel cage rotor conductor portion is cast from pure copper or a copper-based alloy, it is possible to effectively prevent the occurrence of cracks and deterioration of electrical characteristics. can. As a result, it is possible to obtain a rotating electrical machine that is smaller in size and has improved characteristics.

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

図面は本発明実施の１態様を示す断藺図である。 ｌ・・・積層鉄心、／ａ・・・スロット、コ、Ｊ・・・
金臘、ダ、３・・・クツシーン板、６．り・・・エンド
リング部、ｔ・・・バ一部。 出願人代理人　　猪　股　　　　清The drawings are schematic diagrams showing one embodiment of the present invention. l...Laminated core, /a...Slot, J...
金臘、Da、３・・・Shoes scene board、６． ri...end ring part, t...bar part. Applicant's agent Kiyoshi Inomata

Claims (1)

【特許請求の範囲】 ／積層鉄心を金型内に配置し、この積層鉄心のスロット
内に純銅または銅系合金の溶湯を注入して導体部を鋳造
するかご形回転子の製造方法において、前記積層鉄心の
積層方向両端部に、前記溶湯よりも低融点で積層鉄心と
平面的に同形状の板をそれぞれ配置してスロット内に溶
湯を注入することを４１１黴とするかご形回転子の製造
方法。 ユ溶湯よりも低融点で積層鉄心と平面的に同形状の板を
、Ｐｂ、ＺｎまたＦｉｒｎ＠としたことを特徴とする特
許請求の範囲第７項記載のかご形回転子の製造方法。[Scope of Claims] / A method for manufacturing a squirrel cage rotor, in which a laminated iron core is placed in a mold, and a conductor portion is cast by pouring molten metal of pure copper or a copper-based alloy into the slots of the laminated iron core, Manufacture of a squirrel-cage rotor by arranging plates having a melting point lower than that of the molten metal and having the same planar shape as the laminated iron core at both ends of the laminated core in the lamination direction, and injecting the molten metal into the slots. Method. 8. The method of manufacturing a squirrel cage rotor according to claim 7, wherein the plate having a melting point lower than that of the molten metal and having the same planar shape as the laminated iron core is made of Pb, Zn or Firn@.