JPH04121045A - Squirrel-cage rotor - Google Patents

Abstract

PURPOSE:To prevent separation of a conductor due to a centrifugal force and to improve an exciting current, a power factor, an efficiency by providing a groove on the outer periphery of a core, burying the conductor in the groove, and engaging a thin-wall pipe of a magnetic element with the outer periphery of the core. CONSTITUTION:A rectangular groove 32 is provided on the outer periphery of a columnar core 31 integral with the shaft 31a of a magnetic element supported by bearings 39a, 39b, and a soft copper conductor 33 is buried from its radial outside. A thin-wall pipe 35 of a magnetic element is engaged with the outer periphery of the core 31 in which the conductor 33 is buried in the groove 32. According to this structure, the conductor 33 is burdened with centrifugal force generated by a high speed rotation on the thin-wall pipe 35 to eliminate a fear of separation of the conductor 33, and the bending rigidity of a squirrel-cage rotor 30 is increased by the pipe 35. The groove 32 is closed by the pipe of the magnetic element to reduce a magnetic resistance of an air gap between stators, to improve an exciting current, a power factor, an efficiency, and to particularly suppress temperature rise of a light load. Thus, even if it is left to stand in a working field as a concrete vibrator with the switch remaining closed, fear of burning can be avoided.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、コンクリートバイブレータ等に使用される
小径で軸方向に長い電動機のかご形回転子に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a squirrel cage rotor of a small diameter and axially long electric motor used in concrete vibrators and the like.

〔従来の技術〕[Conventional technology]

第２図は従来例と実施例とに共通する一般的なコンクリ
ートパイブレークの斜視図であり、第３図は従来例１を
示して回転図示断面を付記した継断面図であり、第４図
は従来例２の要部断面図である。なお第４図は特願平＞
１１４８０２号に示されたものである。Fig. 2 is a perspective view of a general concrete pie break common to the conventional example and the embodiment, Fig. 3 is a joint cross-sectional view of the conventional example 1 with a rotated cross-section added, and Fig. 4 is a sectional view of a main part of Conventional Example 2. In addition, Figure 4 is a patent application flat>
No. 114802.

第２図において、ハイブレークは電動機ｌと重心が偏心
した振動子を持つ振動部２とからなり、電動機１は耐振
耐水外装ケーブル３、押釦スインチ４、キャブタイヤケ
ーブル５及びプラグ６を介して図示しない例えば２００
〜２５０　Ｈｚの高周波電源に接続される。電動機１と
振動部２とは結合されて全体にかなり細長くされ、生コ
ンの中に突込んで振動により気泡を抜く等に都合がよく
なっている。In FIG. 2, the high break consists of an electric motor 1 and a vibrating part 2 having an eccentric vibrator with an eccentric center of gravity. For example 200
Connected to a high frequency power source of ~250 Hz. The electric motor 1 and the vibrating part 2 are combined and made quite elongated as a whole, which is convenient for pushing into fresh concrete and removing air bubbles by vibration.

第３回に示す従来例１において、かご形回転子１０は極
端に細長く、全長が直径の５〜１０倍もあるため、通常
の電動機のような積層鉄心を用いたり、アルミダイカス
トでかご形導体を形成したりできない。そこで磁性体の
軸１１ａ　と一体な円柱状の鉄心１１の外周部こ矩形状
の溝１２を切り、軟鋼等の導体１３を径方向外側から埋
設し、ハンマでたたいて溝１２の壁に圧接固定する。短
絡環１４はＵ字形の導体を当てがって丸め、導体１３に
ａ部でろう接するのと同時に環状にろう接する。In the conventional example 1 shown in Part 3, the squirrel cage rotor 10 is extremely long and slender, and the total length is 5 to 10 times the diameter. cannot be formed. Therefore, a rectangular groove 12 is cut in the outer periphery of the cylindrical core 11 that is integral with the magnetic shaft 11a, and a conductor 13 made of mild steel or the like is buried from the outside in the radial direction and is pressed against the wall of the groove 12 by hitting with a hammer. Fix it. The short-circuiting ring 14 is rounded by applying a U-shaped conductor, and is soldered to the conductor 13 in a ring shape at the same time as the part a is soldered to the conductor 13.

第４図に示す従来例２は、導体か溝から遠心力で外れな
いようにするため、かご形量転子２０の軸と一体な鉄心
２１の溝２２に凹状Ｉ４２５を形成し、導体２３を径方
向外側かみ埋設Ｌ、外側からローレノト等で押圧して導
体２３を前記凹状溝２５に塑性変形させて押し込むよう
にする。In conventional example 2 shown in FIG. 4, in order to prevent the conductor from coming off the groove due to centrifugal force, a concave I425 is formed in the groove 22 of the iron core 21, which is integrated with the axis of the squirrel-cage type mass rotor 20, and the conductor 23 is The conductor 23 is inserted into the concave groove 25 in the radial direction by pressing it from the outside with a roller or the like to plastically deform the conductor 23 and push it into the concave groove 25.

従来例１．２共に、導体１３又は２３を通常のように軸
方向に挿通しないで、径方向外側から埋設するのは、か
ご形量転子１０．２０が細長く、溝ＩＬ２１は更に細長
くてよほど隙間を設けないと、軸方向には導体を挿通す
ることができないからである。隙間を設けるとバイブレ
ータとしての使用中に導体が破壊する恐れがある。導体
を径方向から埋込むため溝はいわゆるオープンスロット
となって空隙の磁気抵抗が大きくなり、励磁電流の増大
、力率と効率の低下が主２、機械的には高速回転では遠
心力で離脱する恐れがある。In both Conventional Examples 1 and 2, the reason why the conductor 13 or 23 is buried from the outside in the radial direction instead of being inserted in the axial direction as usual is because the cage-shaped quantity trochanter 10.20 is long and narrow, and the groove IL21 is even longer and narrower. This is because unless a gap is provided, the conductor cannot be inserted in the axial direction. If a gap is provided, the conductor may be destroyed during use as a vibrator. Because the conductor is embedded from the radial direction, the groove becomes a so-called open slot, which increases the magnetic resistance of the air gap, which mainly causes an increase in excitation current and a decrease in power factor and efficiency.Mechanically, it separates due to centrifugal force at high speed rotation. There is a risk that

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

前記の従来の技術において、電動機は小径で軸方向に長
いので、かご形回転子コま当然のことながら、回転子鉄
心の溝は軸方向Ｇこ極端二こ細長い。そのため棒状の導
体を鉄心の／ｇＳこ軸方向二こ挿通ずることができず、
径方向外側から埋設することとなり、溝はいわゆるオー
プンスロットとなる。したがって機械的には導体が高速
回転の遠心力で溝の・ら離脱しやすく、外周からたたい
て塑性変形させる必要がある。電気的には有効ギャップ
長さが７１さく励磁電流の増大、力率と効率の低下がさ
けられず、これは特に無負荷又は無負荷に近い軽負荷時
にその傾向が強く、負荷の割に温度上昇が大きい ところでコンクリートバイブレータに使用の時、生コン
中に電動機があるので冷却は良好であるが、型込め作業
が終った時にもスイッチを切らずに作業場に放置される
ことが多く、無負荷に近い軽負荷であって、生コンによ
る冷却がないうえに温度上昇が大で焼損することもある
。In the prior art described above, since the electric motor has a small diameter and is long in the axial direction, the grooves in the rotor core are naturally elongated in the axial direction G. Therefore, it is not possible to insert a rod-shaped conductor through the iron core twice in the axial direction.
It will be buried from the outside in the radial direction, and the groove will be a so-called open slot. Therefore, mechanically, the conductor easily separates from the groove due to the centrifugal force of high-speed rotation, and it is necessary to strike it from the outer periphery to cause it to plastically deform. Electrically, when the effective gap length is 71, an increase in excitation current and a decrease in power factor and efficiency are unavoidable, and this tendency is particularly strong when there is no load or a light load close to no load. When used as a concrete vibrator in areas with large rises, cooling is good because there is an electric motor inside the ready-mixed concrete. The load is almost light, there is no cooling by fresh concrete, and the temperature rise is large enough to cause burnout.

この発明の目的は、かご形量転子に積層鉄心もアルミダ
イカスト導体も使用できないような細長くて使用回転数
の高いものにおいて、導体の遠心力Ｑこよる離脱を確実
に防止し、有効ギャップ長さを大きくして力率と効率の
よいかご形量転子を提供することにある。The purpose of this invention is to reliably prevent separation of the conductor due to centrifugal force Q in squirrel-cage type mass trochanters that are long and slender and operate at high rotational speeds where neither a laminated iron core nor an aluminum die-cast conductor can be used. The object of the present invention is to provide a squirrel-cage type quantum trochanter with increased power factor and efficiency.

二課題を解決するための手段〕 この発明のかご形量転子は、 軸と一体な円柱状の鉄心と、この鉄心の外周部己こ軸方
向に延び、径方向外側から棒状の導体を埋設可能に前記
外周部ムこ開口する複数の溝と、この溝に埋設される導
体と、この導体の両端に固着される環状の短絡環と、前
記鉄心の外径に嵌着される磁性体の薄肉パイプとからな
るものである。[Means for Solving Two Problems] The squirrel cage type quantum trochanter of the present invention includes a cylindrical iron core that is integral with the shaft, and a rod-shaped conductor that extends in the axial direction on the outer circumference of the iron core and is embedded from the radially outer side. a plurality of grooves that are open to the outer periphery, a conductor buried in the grooves, an annular shorting ring fixed to both ends of the conductor, and a magnetic material fitted to the outer diameter of the iron core. It consists of a thin-walled pipe.

〔作用〕[Effect]

溝は径方向外周部に開いているから未だ薄肉バイブのな
い状態で導体を径方向外側から溝に埋設することができ
る。埋設後に磁性体の薄肉パイプを嵌着すれば、薄肉バ
イブは導体に加わる遠心力に耐え、あわせて溝は磁性体
で閉じられて固定子に対する空隙の有効ギャンプ長さが
増加して、励磁電流、力率、効率の改善、とくに無負荷
又は無負荷に近い軽負荷時の改善が著しい。したがって
コンクリートハ・イブレータ等に使用されて、頑丈で焼
用の恐れのない電動機を提供できる。Since the groove is open on the outer periphery in the radial direction, the conductor can be buried in the groove from the outside in the radial direction without a thin-walled vibrator. If a thin-walled pipe made of magnetic material is fitted after burying, the thin-walled vibrator will withstand the centrifugal force applied to the conductor, and at the same time, the groove will be closed with the magnetic material, increasing the effective gap length of the air gap with respect to the stator, and increasing the excitation current. Improvements in power factor and efficiency are particularly noticeable during no-load or light loads close to no-load. Therefore, it is possible to provide an electric motor that is sturdy and has no risk of burning when used in concrete hybridizers and the like.

３実施例〕 第１図は実施例を示し、回転図示断面を付記した継断面
図であり、前記第２図の状態で使用される。従来例及び
各図と同一符号を付けるものはおよそ同一機能を持ち、
以下では説明を省くこともある。3 Embodiment] FIG. 1 shows an embodiment, and is a joint sectional view with a rotating cross section added, and is used in the state shown in FIG. 2. Items with the same reference numerals as those in the conventional example and each figure have approximately the same functions,
Explanations may be omitted below.

第１図において、一部のみ図示した振動部２を固定した
電動機１は、固定子側において固定子コイル３６ａを巻
装した固定子鉄心３６が固定子枠３７の内径に圧入固定
され、両端のブラケット３８ａ、３８ｂに軸受３９ａ、
３９ｂを設けて構成される。In FIG. 1, in the electric motor 1 to which the vibrating part 2, only a part of which is shown, is fixed, a stator core 36 around which a stator coil 36a is wound is press-fitted into the inner diameter of a stator frame 37 on the stator side, and Bearings 39a are attached to the brackets 38a and 38b,
39b.

前記軸受３９ａ、３９ｂで支承される磁性体の軸３１ａ
と一体な円柱状の鉄心３１の外周に矩形又はＵ字状の溝
３２を切り、軟銅等の導体３３を径方向外側から埋設す
る。短絡環３４はＵ字状の導体を当てがって丸め、導体
３３にａ部でろう接又二ま溶接するのと同時二こ環状二
ころう接する。A magnetic shaft 31a supported by the bearings 39a and 39b.
A rectangular or U-shaped groove 32 is cut in the outer periphery of a cylindrical iron core 31 that is integral with the cylindrical core 31, and a conductor 33 made of soft copper or the like is buried from the outside in the radial direction. The short-circuiting ring 34 is rounded by applying a U-shaped conductor, and at the same time as the conductor 33 is soldered or welded to the conductor 33 at part a, it is welded to the conductor 33 in a two-ring shape.

実施例のかご形量転子３０の特徴的な構造として、前記
溝３２４こ導体３３を埋設して前記鉄心３１の外径に磁
性体の薄肉パイプ３５を嵌着する。嵌着は焼ばめ、圧入
、接着等が採用できる。薄肉パイプ３５）よ短絡環３４
にまたがる長さを持ってもよいが、導体３３より少し短
くして嵌着後に導体と短絡環をろう接してもよい。薄肉
パイプ３５は一本の長いものとは限らず分割した短い複
数本のものでもよい。As a characteristic structure of the squirrel cage rotor 30 of the embodiment, the conductor 33 is buried in the groove 324, and a thin magnetic pipe 35 is fitted onto the outer diameter of the iron core 31. Shrink fit, press fit, adhesive, etc. can be used for fitting. Thin wall pipe 35) and short circuit ring 34
The short-circuit ring may have a length that spans , or may be made a little shorter than the conductor 33, and the conductor and the short-circuit ring may be brazed together after fitting. The thin-walled pipe 35 is not limited to one long pipe, and may be divided into a plurality of short pipes.

このような実施例の構造によれば、導体３３は高速回転
による遠心力を薄肉パイプ３５が負担して導体３３の離
脱の恐れがなくかご形量転子３０の曲げ剛性も薄肉パイ
プ３５で増大する。溝３２は磁性体の薄肉パイプで閉し
られて固定子間の空隙の磁気抵抗が小さくなり、励磁電
流、力率、効率が改善され、特に軽負荷の温度上昇が抑
えられ、コンクリートバイブレータとして作業場にスイ
ッチを入れたまま放置されても焼損の恐れがなくなる。According to the structure of this embodiment, the thin-walled pipe 35 bears the centrifugal force due to high-speed rotation of the conductor 33, so there is no fear of the conductor 33 coming off, and the bending rigidity of the squirrel-cage-shaped mass trochanter 30 is also increased by the thin-walled pipe 35. do. The groove 32 is closed with a thin magnetic pipe, which reduces the magnetic resistance of the air gap between the stators, improves the excitation current, power factor, and efficiency, and suppresses temperature rise, especially under light loads, making it suitable for use as a concrete vibrator in the workplace. There is no risk of burnout even if the switch is left on.

前記実施例の変形を説明すると、短絡環３４の両端の軸
３１ａの部分の直径を短絡環の直径と同−又はこれより
更ご二太くすることができ、その場合溝３２の加工はワ
ラ１′ス加工となるので第４図のような形状にできなく
ても導体の耐遠心力は薄肉パイプで確保される。軸３１
ａを太くてきれば軸受３９ａ、３９ｂも大きくなり、固
定子枠３τの直径が制限されても軸受と軸と回転子の剛
性が増すので、より細いコンクリートバイブレータで高
速運転しても丈夫な回転子が得られる。To explain a modification of the above embodiment, the diameter of the shaft 31a at both ends of the short-circuit ring 34 can be made equal to or thicker than the diameter of the short-circuit ring. Even if it is not possible to form the shape as shown in Figure 4, the centrifugal force resistance of the conductor can be ensured by using a thin-walled pipe. axis 31
If a is made thicker, the bearings 39a and 39b will also be larger, and even if the diameter of the stator frame 3τ is limited, the rigidity of the bearings, shaft, and rotor will increase, so a thinner concrete vibrator will provide durable rotation even during high-speed operation. You can have a child.

〔発明の効果〕〔Effect of the invention〕

この発明のかご形量転子は、 軸と一体な円柱状の鉄心と、この鉄心の外周部に軸方向
に延び、径方向外側から棒状の導体を埋設可能Ｇこ前記
外周部に開口する複数の溝と、この溝に埋設される導体
と、この導体の両端二こ固着される環状の短絡環と、前
記鉄心の外径に嵌着される磁性体の薄肉パイプとからな
るようにしたので、かご形量転子が極端に細長くて、溝
に導体を径方向外側から埋設せざるを得ないようなもの
でも、機械的シこは導体の耐遠心力と回転子の曲げ剛性
が向上し、電気的には励磁電流、力率、効率の改善、特
にコンクリートバイブレータ等の使用のように作業場に
スイッチを人孔たまま放置されるような軽負荷での焼損
事故が防止できるという効果がある。溝をフライス加工
して軸及び軸受の寸法を大きくすれ；よ゛より細い電動
機でも軸、軸受、回転子の強度が上り、ハイブレークと
してより細くて高速回転ができるようになるという効果
がある。The squirrel cage rotor of the present invention includes a cylindrical iron core that is integral with the shaft, and a plurality of G holes that extend in the axial direction on the outer periphery of this iron core and that allow rod-shaped conductors to be embedded from the radially outer side. , a conductor buried in this groove, an annular short-circuit ring fixed at both ends of the conductor, and a thin-walled magnetic pipe fitted to the outer diameter of the iron core. Even in cases where the squirrel-cage rotor is extremely long and slender and the conductor must be buried in the groove from the outside in the radial direction, the mechanical seal improves the centrifugal force resistance of the conductor and the bending rigidity of the rotor. Electrically, it has the effect of improving excitation current, power factor, and efficiency, and preventing burnout accidents under light loads such as when using concrete vibrators, where switches are left open in the workplace. . Milling the grooves to increase the dimensions of the shaft and bearings; this has the effect of increasing the strength of the shaft, bearings, and rotor even in a thinner electric motor, and making it possible to rotate at higher speeds as a high break.

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

第１図は実施例を示し、回転図示断面を付記した縦断面
図であり、第２図は従来例と実施例とに共通する一般的
なコンクリートバイブレータの斜視図であり、第３図は
従来例１を示し、回転図示断面を付記した縦断面図であ
り、第４図は従来例２の要部断面図である。 ■・・・電動機、２・・・振動部、１０．２０　３０・
・・かご形量転子、１１，２１．３１・・・鉄心、１１
ａ。 ３１ａ・・・軸、１２，２２．３２・・・溝、１３．２
３□３３・・・導体、１４．３４・・・短絡環、２５・
・・凹状溝、５・・・薄肉パイプ。 第 図 第 図 第 図 第 図Fig. 1 shows an embodiment, and is a vertical cross-sectional view with a rotating cross-section attached, Fig. 2 is a perspective view of a general concrete vibrator common to the conventional example and the embodiment, and Fig. 3 is a conventional concrete vibrator. FIG. 4 is a vertical cross-sectional view showing Example 1, with a rotating cross-section added; FIG. 4 is a cross-sectional view of a main part of Conventional Example 2; ■...Electric motor, 2...Vibration part, 10.20 30.
...Squirrel cage trochanter, 11,21.31...Iron core, 11
a. 31a...shaft, 12,22.32...groove, 13.2
3□33...Conductor, 14.34...Short ring, 25.
... Concave groove, 5... Thin wall pipe. Figure Figure Figure Figure

Claims (1)

【特許請求の範囲】[Claims] １）軸と一体な円柱状の鉄心と、この鉄心の外周部に軸
方向に延び、径方向外側から棒状の導体を埋設可能に前
記外周部に開口する複数の溝と、この溝に埋設される導
体と、この導体の両端に固着される環状の短絡環と、前
記鉄心の外径に嵌着される磁性体の薄肉パイプとからな
ることを特徴とするかご形回転子。1) A cylindrical iron core integral with the shaft, a plurality of grooves extending in the axial direction on the outer periphery of this iron core and opening in the outer periphery so that rod-shaped conductors can be buried from the outside in the radial direction; 1. A squirrel-cage rotor comprising a conductor, an annular short-circuit ring fixed to both ends of the conductor, and a thin-walled magnetic pipe fitted to the outer diameter of the iron core.