JP3447565B2 - Cage-shaped induction motor - Google Patents
Cage-shaped induction motorInfo
- Publication number
- JP3447565B2 JP3447565B2 JP17429798A JP17429798A JP3447565B2 JP 3447565 B2 JP3447565 B2 JP 3447565B2 JP 17429798 A JP17429798 A JP 17429798A JP 17429798 A JP17429798 A JP 17429798A JP 3447565 B2 JP3447565 B2 JP 3447565B2
- Authority
- JP
- Japan
- Prior art keywords
- rotor
- induction motor
- rotor core
- cage induction
- core
- 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
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- Induction Machinery (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、回転子鉄心端外
に突出された回転子導体により発生する通風音の特定周
波数との共鳴を防止するようにして低騒音化を図ったか
ご形誘導電動機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squirrel-cage induction motor in which noise is reduced by preventing resonance of ventilation noise generated by a rotor conductor protruding outside the rotor core end with a specific frequency. It is about.
【０００２】[0002]
【従来の技術】近年、労働環境衛生の向上や近隣への騒
音公害防止の観点から、かご形誘導電動機の低騒音化に
対するユーザの要求は富みに強くなっており、安価な低
騒音電動機の供給を求められている。かご形誘導電動機
の主たる騒音としては、電磁騒音と冷却ファンや回転子
導体等により発生する通風騒音があるが、前者は設計段
階で適宜手段を講じることによりかなりのレベルまで低
減できる。しかし、後者については巻線や鉄心内で発生
した熱を放散する必要があるため、それによる騒音の発
生はある程度やむを得ない面があるとは言え、発生する
騒音レベルは特に高速機では大きく、その低減が課題と
なることも多い。2. Description of the Related Art In recent years, from the viewpoint of improving the working environment hygiene and preventing noise pollution in the neighborhood, users' demands for noise reduction of squirrel-cage induction motors have become rich, and the supply of inexpensive low-noise motors has been increasing. Is being sought. The main noises of a squirrel cage induction motor are electromagnetic noise and ventilation noise generated by a cooling fan, a rotor conductor, etc. The former can be reduced to a considerable level by taking appropriate measures at the design stage. However, for the latter, it is necessary to dissipate the heat generated in the windings and the iron core, so it can be said that the generation of noise due to this is unavoidable to some extent, but the noise level generated is particularly large for high-speed machines, Reduction is often an issue.
【０００３】従来の低騒音化対策を施した防滴保護構造
のかご形誘導電動機を開示したものとして、例えば実開
昭５２ー１６３７１３号公報がある。即ち、この従来の
かご形誘導電動機においては、内部で発生した通風音や
電磁音等をフレーム上部に設けたサイレンサーや、フレ
ーム側面に防振材を介して取り付けた側面カバーにより
低減する構成が開示されている。この構造のかご形誘導
電動機においては、発生した騒音の内、吸排気経路を通
じて機外へ伝播する騒音はサイレンサー内で減音され、
フレーム側板に伝播された騒音はここで遮音されて電動
機全体の騒音レベルが低下される。As a conventional cage type induction motor having a drip-proof protection structure in which noise reduction measures have been taken, there is, for example, Japanese Utility Model Publication No. 52-163713. That is, in this conventional squirrel-cage induction motor, a configuration is disclosed in which ventilation noises, electromagnetic noises and the like generated inside are reduced by a silencer provided on the upper portion of the frame and a side cover attached to the side surface of the frame through a vibration isolator. Has been done. In the squirrel cage induction motor of this structure, of the generated noise, the noise that propagates outside the machine through the intake and exhaust paths is reduced in the silencer,
The noise transmitted to the frame side plates is insulated here, and the noise level of the entire electric motor is lowered.
【０００４】[0004]
【発明が解決しようとする課題】近年の電力用半導体素
子の飛躍的な性能の向上と相俟って、省エネルギーや保
守点検費用の削減等の観点からインバータ駆動により速
度制御されるかご形誘導電動機がかなり増加している。
しかも、速度制御範囲が０〜数千ｒｐｍに亘るものもあ
り、この場合は、取り分け高速回転時の通風騒音が問題
となりがちで、商用周波数のみで運転されるものでは遭
遇しなかった新たな問題も生じている。具体的には、回
転子鉄心の端面，この端面から突出された隣り合う回転
子導体の内側面，回転子導体端部間を連結する短絡環の
内側面及び回転子鉄心押さえの外周面で囲んで形成され
る柱状空間部において発生する、上記突出された回転子
導体により生じる通風音の特定周波数への気柱共鳴現象
である。これによる騒音の急激な増加は、それが高周波
で不快な聴感領域の音であるだけに問題となることが多
い。ところが、上記のような従来の構造のかご形誘導電
動機では、このような気柱共鳴現象による騒音の急増を
予防できず、発生してから事後的にサイレンサーの減音
度を高めたり、他の構成部材の遮音度を高める等の対策
が必要となる。このため、電動機のコストが増加したり
出荷の遅延を来す等の問題があった。Along with the dramatic improvement in the performance of power semiconductor devices in recent years, a squirrel-cage induction motor whose speed is controlled by an inverter drive from the viewpoint of energy saving and reduction of maintenance and inspection costs. Has increased considerably.
Moreover, the speed control range may range from 0 to several thousand rpm, and in this case, ventilation noise during high-speed rotation tends to be a problem, and a new problem that has not been encountered in the case of operating only at commercial frequencies. Is also occurring. Specifically, it is surrounded by the end surface of the rotor core, the inner surface of the adjacent rotor conductors protruding from this end surface, the inner surface of the short-circuit ring connecting the rotor conductor ends, and the outer surface of the rotor core retainer. The air column resonance phenomenon occurs at the specific frequency of the ventilation noise generated by the projecting rotor conductor, which occurs in the columnar space portion formed by. The abrupt increase in noise due to this is often problematic because it is a high-frequency unpleasant audible region sound. However, with the squirrel-cage induction motor having the conventional structure as described above, it is not possible to prevent a sudden increase in noise due to such a column resonance phenomenon, and it is possible to increase the noise reduction of the silencer after the occurrence, or to It is necessary to take measures such as increasing the sound insulation of the components. Therefore, there have been problems such as an increase in the cost of the electric motor and a delay in shipping.
【０００５】この度、発明者は、上記のようなかご形誘
導電動機の突出回転子導体により発生する通風音の特定
周波数への気柱共鳴現象につき解明し、その確実かつ安
価な防止策を見出だした。この発明は、上記問題点を解
決するためこの知見に基づいてなされたもので、所定の
運転回転数領域において特定騒音の異常な増加を来すこ
とがない、安価な低騒音かご形誘導電動機を提供するこ
とを目的としている。The inventor has now clarified the air column resonance phenomenon at a specific frequency of the ventilation noise generated by the protruding rotor conductor of the squirrel cage induction motor as described above, and found a reliable and inexpensive preventive measure. It was The present invention has been made based on this finding to solve the above problems, and an inexpensive low noise squirrel-cage induction motor that does not cause an abnormal increase in specific noise in a predetermined operating speed range. It is intended to be provided.
【０００６】[0006]
【課題を解決するための手段】この発明に係るかご形誘
導電動機は、インバータ駆動により商用周波数運転領域
を越えて速度制御されるかご形誘導電動機において、回
転磁界を生じる巻線を有する固定子鉄心、この固定子鉄
心と空隙を介して回転可能に対向配置された回転子鉄
心、この回転子鉄心の側端面に当接配置された回転子鉄
心押さえ、回転子鉄心の外周部の溝内に設けられて一部
が鉄心の側端面から突出された複数の回転子導体、この
回転子導体の端部間を連結する短絡環を備え、回転子鉄
心の側端面、隣り合う突出された回転子導体の各側面、
短絡環の内側面及び回転子鉄心押さえの外周面で囲まれ
た柱状空間部において、回転子導体の径方向の外周面か
ら回転子鉄心押さえの径方向の外周面までの長さが、突
出された回転子導体が発生する通風音の特定周波数と気
柱共鳴を起こす長さを含み、気柱共鳴を起こす長さと異
なる長さになるように回転子鉄心押さえの径方向の外周
面が形成されているものである。A squirrel-cage induction motor according to the present invention is driven by an inverter to operate in a commercial frequency range.
In a squirrel-cage induction motor whose speed is controlled over , a stator core having windings that generate a rotating magnetic field, a rotor core rotatably opposed to the stator core through a gap, and a rotor core of the rotor core. Rotor core retainer disposed in contact with the side end face, a plurality of rotor conductors provided in a groove on the outer peripheral portion of the rotor core and partly protruding from the side end face of the core, and end portions of the rotor conductor A short-circuiting ring connecting between the rotor core, the side end surface of the rotor core, each side surface of the adjacent protruding rotor conductor,
In the columnar space surrounded by the inner surface of the short-circuit ring and the outer peripheral surface of the rotor core holder, the length from the outer peripheral surface of the rotor conductor in the radial direction to the outer peripheral surface of the rotor core holder in the radial direction is projected. It includes the specific frequency of the ventilation noise generated by the rotor conductor and the length that causes air column resonance.
Outer circumference of the rotor core retainer in the radial direction so that
The surface is formed.
【０００７】また、回転子鉄心押さえは、径方向断面が
円形で、軸方向断面がテーパ状に形成されているもので
ある。また、回転子鉄心押さえは、径方向断面が円形
で、軸方向断面が階段状に形成されているものである。
また、回転子鉄心押さえは、軸方向の断面が山形状に形
成されているものである。また、回転子鉄心押さえは、
軸方向の断面が谷形状に形成されているものである。ま
た、回転子鉄心押さえは、径方向断面が楕円形に形成さ
れているものである。また、回転子鉄心押さえは、径方
向断面が多角形状に形成されているものである。The rotor core holder has a circular radial cross section and a tapered axial cross section. The rotor core retainer has a circular radial cross section and a stepwise axial cross section.
Further, the rotor iron core retainer has a mountain-shaped cross section in the axial direction. Also, the rotor core holder is
The axial cross section is formed in a valley shape. In addition, the rotor core retainer has an elliptical cross section in the radial direction. In addition, the rotor core retainer has a polygonal cross section in the radial direction.
【０００８】また、回転磁界を生じる巻線を有する固定
子鉄心、この固定子鉄心と空隙を介して回転可能に対向
配置された回転子鉄心、この回転子鉄心の側端面に当接
配置された回転子鉄心押さえ、回転子鉄心の外周部の溝
内に設けられて一部が鉄心の側端面から突出された複数
の回転子導体、この回転子導体の端部間を連結する短絡
環を備え、回転子鉄心押さえは、回転子鉄心の側端面か
ら突出された複数の回転子導体間に挿入され、径方向に
高さの異なる複数の突起部を有しているものである。Further, a stator core having windings for generating a rotating magnetic field, a rotor core rotatably opposed to the stator core through a gap, and a side end surface of the rotor core are arranged in contact with each other. A rotor core holder, a plurality of rotor conductors that are provided in the grooves on the outer periphery of the rotor core and partially protrude from the side end faces of the core, and a short-circuit ring that connects the end portions of the rotor conductors. The rotor core retainer is provided with a plurality of protrusions that are inserted between a plurality of rotor conductors protruding from the side end surface of the rotor core and that have different radial heights.
【０００９】[0009]
【発明の実施の形態】実施の形態１．以下、この発明の
実施の形態１について図面に基づき説明する。図１は、
この発明のかご形誘導電動機の要部断面図であり、図２
は、図１におけるＡ部（突出回転子導体回り部）の拡大
断面図、図３は、図２におけるIII-III 方向に見た断面
正面図である。図に示すように、かご形誘導電動機で
は、固定子枠１内に回転磁界を生じる固定子巻線３が複
数の溝（図示せず）内に巻回・収納された固定子鉄心２
が配置され、軸４には回転子鉄心５が嵌合されその両端
を回転子鉄心押さえ９により押圧・保持されている。回
転子鉄心押さえ９の外周には鉄心押さえ部１０と径方向
断面が円形で、軸方向断面がテーパ状であるテーパ状部
１１が形成されている。回転子鉄心５の外周近傍に設け
られた複数の溝（図示せず）内には、それぞれ回転子導
体６が挿入され、回転子鉄心５の端面から突出された突
出回転子導体７の端部は相互に短絡環８で連結されてい
る。BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. Figure 1
FIG. 2 is a cross-sectional view of a main part of the squirrel cage induction motor of the present invention.
FIG. 3 is an enlarged cross-sectional view of a portion A (protruding rotor conductor surrounding portion) in FIG. 1, and FIG. 3 is a cross-sectional front view seen in the III-III direction in FIG. 2. As shown in the drawing, in a squirrel-cage induction motor, a stator core 2 having a stator frame 1 in which a stator winding 3 for generating a rotating magnetic field is wound and housed in a plurality of grooves (not shown)
The rotor core 5 is fitted to the shaft 4, and both ends of the rotor core 5 are pressed and held by the rotor core pressers 9. On the outer circumference of the rotor iron core retainer 9, there is formed an iron core retainer 10 and a tapered portion 11 having a circular radial cross section and a tapered axial cross section. The rotor conductor 6 is inserted into each of a plurality of grooves (not shown) provided in the vicinity of the outer periphery of the rotor core 5, and the end portion of the protruding rotor conductor 7 that protrudes from the end surface of the rotor core 5. Are mutually connected by a short-circuit ring 8.
【００１０】軸４は軸受け１２によって回転可能に固定
子枠１に支持され、固定子鉄心２と回転子鉄心５とは空
隙１３を介して対向配置されている。１４は回転子鉄心
５の端面，隣り合う突出回転子導体７の各側面，短絡環
７の内側面，及び回転子鉄心押さえ９の外周の鉄心押さ
え部１０と断面円形のテーパ状部１１により形成された
柱状空間部、１５（符号ｂ）は回転子導体７相互間の外
周部の幅、１６（符号ｄ）は回転子導体７の半径方向の
外周面から回転子鉄心押さえ９の外周面までの距離、即
ち、柱状空間部１４の深さであり、１７（符号ｄr ）は
気柱共鳴を生じる柱状空間部１４の共鳴深さである。回
転子鉄心押さえ９のテーパ状部１１は、共鳴深さ１７を
基に柱状空間部１４の深さ１６の値を軸方向に変化させ
て共鳴を起こし難くするために設けたものである。The shaft 4 is rotatably supported by the stator frame 1 by a bearing 12, and the stator core 2 and the rotor core 5 are arranged to face each other with a gap 13 therebetween. Reference numeral 14 is formed by the end surface of the rotor core 5, each side surface of the adjacent protruding rotor conductors 7, the inner surface of the short-circuit ring 7, the core pressing portion 10 on the outer periphery of the rotor core pressing 9, and the tapered portion 11 having a circular cross section. 15 (symbol b) is the width of the outer peripheral portion between the rotor conductors 7 and 16 (symbol d) is the radial outer peripheral surface of the rotor conductor 7 to the outer peripheral surface of the rotor core retainer 9. , That is, the depth of the columnar space portion 14, and 17 (reference numeral d r ) is the resonance depth of the columnar space portion 14 that causes air column resonance. The tapered portion 11 of the rotor core retainer 9 is provided to change the value of the depth 16 of the columnar space portion 14 in the axial direction based on the resonance depth 17 to make resonance difficult.
【００１１】上記構成のかご形誘導電動機の固定子巻線
３に電気が供給されると、回転磁界を生じて回転子鉄心
５が回転し、突出回転子導体７により通風音を発生す
る。ここで、発明者は、０〜約６０００ｒｐｍの間に亘
り速度制御を行うかご形誘導電動機において、約４５０
０ｒｐｍ付近で急激に騒音が増加する異常現象に遭遇
し、実験と解析を重ねた結果、この原因が上記柱状空間
部１４で発生した突出回転子導体７による通風音への共
鳴現象であることを突き止めた。共鳴周波数ｆr （Ｈ
Ｚ）は、突出回転子導体７相互間の外周部幅寸法ｂ，柱
状空間部の深さ寸法ｄ（単位ｍｍ）、音速３４０ｍ／ｓ
ｅｃとして次式（１）で表される。
ｆr ＝８５×１０3 ／｛ｄ＋（ｂ／２）×０．６｝ ・・・（１）
即ち、共鳴周波数ｆr は上記ｂとｄの関数となるが、殆
ど柱状空間部の深さ寸法ｄの値により支配され、回転子
導体間の幅寸法ｂの影響は少ない。なお、共鳴周波数ｆ
r 対応の回転数をＮr （ｒｐｍ），回転子導体数をｎb
（本）として、ｆr ＝（Ｎr ／６０）×ｎb の関係を式
（１）に代入すると、
Ｎr ＝５１００×１０3 ／［ｎb ×｛ｄ＋（ｂ／２）×０．６｝］
・・・ （２）When electricity is supplied to the stator winding 3 of the squirrel cage induction motor having the above-mentioned structure, a rotating magnetic field is generated to rotate the rotor core 5, and the protruding rotor conductor 7 produces ventilation noise. Here, in the squirrel-cage induction motor that controls the speed over 0 to about 6000 rpm, the inventor has about 450
As a result of repeated experiments and analyzes after encountering an abnormal phenomenon in which noise abruptly increased near 0 rpm, it was found that this cause was a resonance phenomenon caused by the protruding rotor conductor 7 generated in the columnar space 14 with respect to the ventilation noise. I found it. Resonance frequency fr (H
Z) is the outer peripheral width dimension b between the protruding rotor conductors 7, the depth dimension d (unit mm) of the columnar space, and the sound velocity 340 m / s.
It is represented by the following formula (1) as ec. f r = 85 × 10 3 /{d+(b/2)×0.6} (1) That is, the resonance frequency f r is a function of b and d, but the depth of the columnar space is almost the same. It is governed by the value of the dimension d, and the influence of the width dimension b between the rotor conductors is small. The resonance frequency f
r corresponding rotation speed N r (rpm), the number of rotor conductors n b
Substituting the relationship of f r = (N r / 60) × n b into (1) as (book), N r = 5100 × 10 3 / [n b × {d + (b / 2) × 0. 6}] ... (2)
【００１２】そして、種々検討を重ねた結果、当該かご
形誘導電動機の運転速度範囲に式（２）で求められた回
転数Ｎr が存在するときは、その場合の柱状空間部１４
の共鳴深さ１７を基にして深さ１６が増減するように回
転子鉄心押さえ９の外周部の形状を形成するのが有効で
ある。共鳴は、柱状空間部の深さ１６がその波長の４分
の１となるような周波数で発生するため、深さ１６が異
なれば共鳴周波数も変化するからである。図２では、予
め、回転子鉄心押さえ９の外周部の形状を共鳴周波数ｆ
r を与える柱状空間部１４の共鳴深さ１７を基に断面円
形のテーパ状に形成して軸方向に深さ１６を変化させ、
共鳴周波数を分散化して共鳴し難くしたものである。こ
の結果、すべての運転速度範囲において特定騒音が異常
に増大する現象はなくなり、騒音の低い安価なかご形誘
導電動機が得られた。As a result of various studies, when the rotation speed N r obtained by the equation (2) exists in the operating speed range of the squirrel cage induction motor, the columnar space portion 14 in that case exists.
It is effective to form the shape of the outer peripheral portion of the rotor core retainer 9 so that the depth 16 increases or decreases based on the resonance depth 17 of the above. This is because the resonance occurs at a frequency at which the depth 16 of the columnar space becomes 1/4 of the wavelength, and therefore the resonance frequency changes if the depth 16 changes. In FIG. 2, the shape of the outer peripheral portion of the rotor iron core retainer 9 is set to the resonance frequency f in advance.
Based on the resonance depth 17 of the columnar space portion 14 which gives r , it is formed into a tapered shape with a circular cross section, and the depth 16 is changed in the axial direction,
The resonance frequency is dispersed to make resonance difficult. As a result, the phenomenon in which the specific noise does not increase abnormally in all operating speed ranges was eliminated, and an inexpensive squirrel cage induction motor with low noise was obtained.
【００１３】実施の形態２．図４は、この発明の実施の
形態２のかご形誘導電動機の突出回転子導体回り部の拡
大断面図であり、柱状空間部１４の深さ１６が回転子鉄
心５側からテーパ状部１１に従い軸方向に減少する形状
の回転子鉄心押さえ９を示す。この場合も、柱状空間部
１４はその共鳴深さ１７を基に深さ１６が軸方向に変化
するので、実施の形態１における場合と同様の効果を奏
する。Embodiment 2. FIG. 4 is an enlarged cross-sectional view of a protruding rotor conductor surrounding portion of a squirrel cage induction motor according to Embodiment 2 of the present invention. The depth 16 of the columnar space portion 14 follows the tapered portion 11 from the rotor core 5 side. A rotor core retainer 9 having a shape that decreases in the axial direction is shown. Also in this case, since the depth 16 of the columnar space portion 14 changes in the axial direction based on the resonance depth 17, the same effect as that in the first embodiment can be obtained.
【００１４】実施の形態３．図５は、この発明の実施の
形態３のかご形誘導電動機の突出回転子導体回り部の拡
大断面図であり、回転子鉄心押さえ９の外周部をテーパ
状部１１で軸方向に山形に形成して深さ１６が増加又は
減少する回転子鉄心押さえ９を示す。図において１８は
テーパ状山形部である。この場合も、柱状空間部１４は
その共鳴深さ１７を基に深さ１６が軸方向に変化するの
で、実施の形態１における場合と同様の効果を奏する。Embodiment 3. FIG. 5 is an enlarged cross-sectional view of a protruding rotor conductor surrounding portion of a squirrel-cage induction motor according to Embodiment 3 of the present invention, in which the outer peripheral portion of the rotor core pressing member 9 is formed in a mountain shape in the axial direction by the tapered portion 11. The rotor core retainer 9 is shown with depth 16 increasing or decreasing. In the figure, 18 is a tapered mountain portion. Also in this case, since the depth 16 of the columnar space portion 14 changes in the axial direction based on the resonance depth 17, the same effect as that in the first embodiment can be obtained.
【００１５】実施の形態４．図６は、この発明の実施の
形態４のかご形誘導電動機の突出回転子導体回り部の拡
大断面図であり、回転子鉄心押さえ９の外周部をテーパ
状部１１で軸方向に谷形に形成して深さ１６が増加又は
減少する回転子鉄心押さえ９を示す。図において１９は
テーパ状谷形部である。この場合も、柱状空間部１４は
その共鳴深さ１７を基に深さ１６が軸方向に変化するの
で、実施の形態１における場合と同様の効果を奏する。Fourth Embodiment FIG. 6 is an enlarged cross-sectional view of a protruding rotor conductor surrounding portion of a squirrel cage induction motor according to Embodiment 4 of the present invention. The outer peripheral portion of the rotor iron core retainer 9 is formed in a valley shape in the axial direction by a tapered portion 11. 1 illustrates a rotor core retainer 9 that is formed to increase or decrease depth 16. In the figure, 19 is a tapered valley portion. Also in this case, since the depth 16 of the columnar space portion 14 changes in the axial direction based on the resonance depth 17, the same effect as that in the first embodiment can be obtained.
【００１６】実施の形態５．図７は、この発明の実施の
形態５のかご形誘導電動機の突出回転子導体回り部の拡
大断面図であり、柱状空間部１４の深さ１６が回転子鉄
心５側から軸方向に順次増加するように直径の異なる複
数の断面円形の円盤状部２０を階段状に連ねて形成され
たものであって、径方向断面が円形で、軸方向断面が階
段状に形成された回転子鉄心押さえ９を示す。この場合
も、柱状空間部１４はその共鳴深さ１７を基に深さ１６
が軸方向に変化するので、実施の形態１における場合と
同様の効果を奏する。Embodiment 5. FIG. 7 is an enlarged cross-sectional view of a protruding rotor conductor surrounding portion of a squirrel cage induction motor according to Embodiment 5 of the present invention, in which the depth 16 of the columnar space portion 14 sequentially increases in the axial direction from the rotor core 5 side. As described above, a plurality of disk-shaped portions 20 having different circular cross-sections are connected in a stepwise manner, and the rotor core retainer has a circular radial section and a stepwise axial section. 9 is shown. Also in this case, the columnar space portion 14 has a depth 16 based on the resonance depth 17 thereof.
Changes in the axial direction, so that the same effect as in the first embodiment can be obtained.
【００１７】実施の形態６．図８は、この発明の実施の
形態６のかご形誘導電動機の突出回転子導体回り部の拡
大断面図であり、柱状空間部１４の深さ１６が回転子鉄
心５側から軸方向に順次減少するように直径の異なる複
数の円盤状部２０を階段状に連ねて形成した回転子鉄心
押さえ９を示す。この場合も、柱状空間部１４はその共
鳴深さ１７を基に深さ１６が軸方向に変化するので、実
施の形態１における場合と同様の効果を奏する。Sixth Embodiment FIG. 8 is an enlarged cross-sectional view of a protruding rotor conductor surrounding portion of a squirrel cage induction motor according to Embodiment 6 of the present invention, in which the depth 16 of the columnar space portion 14 is gradually reduced in the axial direction from the rotor core 5 side. Thus, the rotor core retainer 9 formed by connecting a plurality of disc-shaped portions 20 having different diameters in a stepwise manner is shown. Also in this case, since the depth 16 of the columnar space portion 14 changes in the axial direction based on the resonance depth 17, the same effect as that in the first embodiment can be obtained.
【００１８】実施の形態７．図９は、この発明の実施の
形態７のかご形誘導電動機の突出回転子導体回り部の拡
大断面図であり、回転子鉄心押さえ９の外周部を、直径
の異なる複数の円盤状部２０を軸方向へ階段状に連ねて
山形に形成し柱状空間部１４の深さ１６が軸方向に順次
増加又は減少するようにした回転子鉄心押さえ９を示
す。図において２１は階段状山形部である。この場合
も、柱状空間部１４はその共鳴深さ１７を基に深さ１６
が軸方向に変化するので、実施の形態１における場合と
同様の効果を奏する。Embodiment 7. FIG. 9 is an enlarged cross-sectional view of a protruding rotor conductor surrounding portion of a squirrel cage induction motor according to Embodiment 7 of the present invention. The outer peripheral portion of the rotor core retainer 9 is provided with a plurality of disc-shaped portions 20 having different diameters. A rotor core retainer 9 is shown which is formed in a mountain shape by connecting in a stepwise manner in the axial direction so that the depth 16 of the columnar space portion 14 sequentially increases or decreases in the axial direction. In the figure, reference numeral 21 denotes a stepped mountain portion. Also in this case, the columnar space portion 14 has a depth 16 based on the resonance depth 17 thereof.
Changes in the axial direction, so that the same effect as in the first embodiment can be obtained.
【００１９】実施の形態８．図１０は、この発明の実施
の形態８のかご形誘導電動機の突出回転子導体回り部の
拡大断面図であり、回転子鉄心押さえ９の外周部を、直
径の異なる複数の円盤状部２０を軸方向へ階段状に連ね
て谷形に形成し柱状空間部１４の深さ１６が軸方向に順
次増加又は減少するようにした回転子鉄心押さえ９を示
す。図において２２は階段状谷形部である。この場合
も、柱状空間部１４はその共鳴深さ１７を基に深さ１６
が軸方向に変化するので、実施の形態１における場合と
同様の効果を奏する。Embodiment 8. FIG. 10 is an enlarged sectional view of a protruding rotor conductor surrounding portion of a squirrel-cage induction motor according to Embodiment 8 of the present invention. The outer peripheral portion of the rotor core retainer 9 is provided with a plurality of disc-shaped portions 20 having different diameters. A rotor core retainer 9 is shown which is formed in a valley shape by connecting in a stepwise manner in the axial direction so that the depth 16 of the columnar space portion 14 increases or decreases sequentially in the axial direction. In the figure, 22 is a stepped valley portion. Also in this case, the columnar space portion 14 has a depth 16 based on the resonance depth 17 thereof.
Changes in the axial direction, so that the same effect as in the first embodiment can be obtained.
【００２０】実施の形態９．図１１は、この発明の実施
の形態９のかご形誘導電動機の突出回転子導体回り部の
拡大断面図であり、図１１（ａ）はその断面側面図、図
１１（ｂ）は図１１（ａ）のＸＩｂ−ＸＩｂ方向に見た
断面正面図である。図において２３は回転子鉄心押さえ
９の外周に軸対称に形成された断面が楕円形の楕円板状
部である。楕円板状部２３により、柱状空間部１４の深
さ１６は周方向に増加又は減少することになる。この場
合も、柱状空間部１４はその共鳴深さ１７を基に深さ１
６が周方向に変化するので、実施の形態１における場合
と同様の効果を奏する。Ninth Embodiment 11 is an enlarged cross-sectional view of a protruding rotor conductor surrounding portion of a squirrel-cage induction motor according to a ninth embodiment of the present invention, FIG. 11 (a) is a cross-sectional side view thereof, and FIG. It is the section front view seen in the XIb-XIb direction of a). In the figure, reference numeral 23 designates an elliptical plate-shaped portion having an elliptical cross section formed axially symmetrically on the outer periphery of the rotor core retainer 9. Due to the elliptical plate-shaped portion 23, the depth 16 of the columnar space portion 14 increases or decreases in the circumferential direction. Also in this case, the columnar space portion 14 has a depth of 1 based on the resonance depth 17 thereof.
Since 6 changes in the circumferential direction, the same effect as in the first embodiment can be obtained.
【００２１】実施の形態１０．図１２は、この発明の実
施の形態１０のかご形誘導電動機の突出回転子導体回り
部の拡大断面図であり、図１２（ａ）はその断面側面
図、図１２（ｂ）は図１２（ａ）のＸIIｂ−ＸIIｂ方向
に見た断面正面図である。図示のように、予め回転子鉄
心押さえ９の外周に、柱状空間部１４の共鳴深さ１７を
基に深さ１６が周方向に増加又は減少する軸対称に断面
が多角形の多角板状部２４を形成したものである。この
場合も、柱状空間部１４はその共鳴深さ１７を基に深さ
１６が周方向に変化するので、実施の形態１における場
合と同様の効果を奏する。Embodiment 10. 12A and 12B are enlarged cross-sectional views of a portion around a protruding rotor conductor of a squirrel-cage induction motor according to a tenth embodiment of the present invention. FIG. 12A is a cross-sectional side view thereof, and FIG. It is sectional front view seen in the XIIb-XIIb direction of a). As shown in the drawing, a polygonal plate-shaped portion having a polygonal cross section with an axial symmetry in which the depth 16 increases or decreases in the circumferential direction based on the resonance depth 17 of the columnar space portion 14 on the outer periphery of the rotor core retainer 9 in advance. 24 is formed. Also in this case, since the depth 16 of the columnar space portion 14 changes in the circumferential direction based on the resonance depth 17, the same effect as in the first embodiment can be obtained.
【００２２】実施の形態１１．図１３は、この発明の実
施の形態１１のかご形誘導電動機の突出回転子導体回り
部の拡大断面図であり、図１３（ａ）はその断面側面
図、図１３（ｂ）は図１３（ａ）のＸIII ｂ−ＸIII ｂ
方向に見た断面正面図である。図示のように、予め回転
子鉄心押さえ９の外周に、柱状空間部１４の共鳴深さ１
７を基に深さ１６が周方向に増加又は減少するように半
径方向高さの異なる平板状の突起板状部２５を突出回転
子導体７間に挿入させて形成したものである。この場合
も、柱状空間部１４はその共鳴深さ１７を基に深さ１６
が周方向に変化するので、実施の形態１における場合と
同様の効果を奏する。Eleventh Embodiment 13A and 13B are enlarged cross-sectional views of a protruding rotor conductor surrounding portion of a squirrel-cage induction motor according to an eleventh embodiment of the present invention. FIG. 13A is a cross-sectional side view thereof, and FIG. a) XIII b-XIII b
It is the cross-sectional front view seen in the direction. As shown in the drawing, the resonance depth 1 of the columnar space portion 14 is previously formed on the outer periphery of the rotor core retainer 9.
7 is formed by inserting flat plate-like projecting plate portions 25 having different radial heights between the projecting rotor conductors 7 so that the depth 16 increases or decreases in the circumferential direction. Also in this case, the columnar space portion 14 has a depth 16 based on the resonance depth 17 thereof.
Changes in the circumferential direction, so that the same effect as in the first embodiment can be obtained.
【００２３】[0023]
【発明の効果】この発明のかご形誘導電動機によれば、
回転子鉄心，回転子鉄心端外への突出された回転子導
体，短絡環及び回転子鉄心押さえで形成される柱状空間
部の深さを、その共鳴深さを基に軸方向又は周方向に分
散させる要素部を予め回転子鉄心押さえの外周に設けて
共鳴周波数を分散させるようにしたので、当該電動機の
運転回転数領域における特定回転数での異常な騒音の増
大を抑制でき、安価で騒音の低いかご形誘導電動機が得
られるという効果がある。According to the squirrel cage induction motor of the present invention,
The depth of the columnar space formed by the rotor core, the rotor conductor protruding outside the rotor core end, the short-circuit ring, and the rotor core retainer is determined in the axial or circumferential direction based on the resonance depth. Since the element to disperse is provided in advance on the outer periphery of the rotor core holder to disperse the resonance frequency, it is possible to suppress an increase in abnormal noise at a specific rotation speed in the operating rotation speed region of the electric motor, and to reduce the noise at low cost. There is an effect that a cage type induction motor having a low power consumption can be obtained.
【図１】 この発明の実施の形態１によるかご形誘導電
動機の要部断面図である。FIG. 1 is a sectional view of essential parts of a squirrel-cage induction motor according to a first embodiment of the present invention.
【図２】 図１のＡ部（突出回転子導体回り部）の拡大
断面図である。FIG. 2 is an enlarged cross-sectional view of part A (around the protruding rotor conductor) of FIG.
【図３】 図２のIII-III 方向に見た断面正面図であ
る。FIG. 3 is a front sectional view taken along line III-III in FIG.
【図４】 この発明の実施の形態２によるかご形誘導電
動機の突出回転子導体回り部の拡大断面図である。FIG. 4 is an enlarged sectional view of a portion around a protruding rotor conductor of a squirrel-cage induction motor according to Embodiment 2 of the present invention.
【図５】 この発明の実施の形態３によるかご形誘導電
動機の突出回転子導体回り部の拡大断面図である。FIG. 5 is an enlarged sectional view of a portion around a protruding rotor conductor of a squirrel cage induction motor according to a third embodiment of the present invention.
【図６】 この発明の実施の形態４によるかご形誘導電
動機の突出回転子導体回り部の拡大断面図である。FIG. 6 is an enlarged sectional view of a portion around a protruding rotor conductor of a squirrel-cage induction motor according to a fourth embodiment of the present invention.
【図７】 この発明の実施の形態５によるかご形誘導電
動機の突出回転子導体回り部の拡大断面図である。FIG. 7 is an enlarged cross-sectional view of a portion around a protruding rotor conductor of a squirrel-cage induction motor according to Embodiment 5 of the present invention.
【図８】 この発明の実施の形態６によるかご形誘導電
動機の突出回転子導体回り部の拡大断面図である。FIG. 8 is an enlarged sectional view of a portion around a protruding rotor conductor of a squirrel-cage induction motor according to Embodiment 6 of the present invention.
【図９】 この発明の実施の形態７によるかご形誘導電
動機の突出回転子導体回り部の拡大断面図である。FIG. 9 is an enlarged sectional view of a portion around a protruding rotor conductor of a squirrel cage induction motor according to a seventh embodiment of the present invention.
【図１０】 この発明の実施の形態８によるかご形誘導
電動機の突出回転子導体回り部の拡大断面図である。FIG. 10 is an enlarged sectional view of a portion around a protruding rotor conductor of a squirrel cage induction motor according to Embodiment 8 of the present invention.
【図１１】 この発明の実施の形態９によるかご形誘導
電動機の突出回転子導体回り部の拡大断面図である。FIG. 11 is an enlarged cross-sectional view around a protruding rotor conductor of a squirrel cage induction motor according to a ninth embodiment of the present invention.
【図１２】 この発明の実施の形態１０によるかご形誘
導電動機の突出回転子導体回り部の拡大断面図である。FIG. 12 is an enlarged cross-sectional view of a portion around a protruding rotor conductor of a squirrel cage induction motor according to Embodiment 10 of the present invention.
【図１３】 この発明の実施の形態１１によるかご形誘
導電動機の突出回転子導体回り部の拡大断面図である。FIG. 13 is an enlarged cross-sectional view of a portion around a protruding rotor conductor of a squirrel cage induction motor according to an eleventh embodiment of the present invention.
１ 固定子枠 ２ 固定子鉄心 ３
固定子巻線
５ 回転子鉄心 ６ 回転子導体 ７
突出回転子導体
８ 短絡環 ９ 回転子鉄心押さえ １１
テーパ状部
１３ 空隙 １４ 柱状空間部 １６
柱状空間部深さ
１７ 共鳴深さ １８ テーパ状山形部 １９
テーパ状谷形部
２０ 円盤状部 ２１ 階段状山形部 ２２
階段状谷形部
２３ 楕円板状部 ２４ 多角板状部 ２５
突起板状部1 Stator frame 2 Stator core 3
Stator winding 5 Rotor core 6 Rotor conductor 7
Projecting rotor conductor 8 Short-circuit ring 9 Rotor core holder 11
Tapered portion 13 Void 14 Columnar space portion 16
Columnar space depth 17 Resonance depth 18 Tapered chevron 19
Tapered valley portion 20 Disc portion 21 Stepped mountain portion 22
Stepped valley portion 23 Elliptical plate portion 24 Polygonal plate portion 25
Projection plate
Claims (8)
域を越えて速度制御されるかご形誘導電動機において、
回転磁界を生じる巻線を有する固定子鉄心、この固定子
鉄心と空隙を介して回転可能に対向配置された回転子鉄
心、この回転子鉄心の側端面に当接配置された回転子鉄
心押さえ、上記回転子鉄心の外周部の溝内に設けられて
一部が鉄心の側端面から突出された複数の回転子導体、
この回転子導体の端部間を連結する短絡環を備え、上記
回転子鉄心の側端面、隣り合う上記突出された回転子導
体の各側面、上記短絡環の内側面及び回転子鉄心押さえ
の外周面で囲まれた柱状空間部において、上記回転子導
体の径方向の外周面から上記回転子鉄心押さえの径方向
の外周面までの長さが、上記突出された回転子導体が発
生する通風音の特定周波数と気柱共鳴を起こす長さを含
み、上記気柱共鳴を起こす長さと異なる長さになるよう
に上記回転子鉄心押さえの径方向の外周面が形成されて
いることを特徴とするかご形誘導電動機。1. A commercial frequency operation area driven by an inverter.
In a squirrel cage induction motor whose speed is controlled beyond the range,
A stator iron core having a winding for generating a rotating magnetic field, a rotor iron core rotatably opposed to the stator iron core via a gap, a rotor iron core retainer arranged in contact with a side end surface of the rotor iron core, A plurality of rotor conductors provided in the groove of the outer peripheral portion of the rotor core and partly protruding from the side end surface of the core,
The rotor conductor is provided with a short-circuit ring that connects the end portions of the rotor conductor, the side end faces of the rotor core, the adjacent side faces of the protruding rotor conductor, the inner face of the short-circuit ring, and the outer periphery of the rotor core retainer. in the columnar space surrounded by the surface, a radial direction of the rotor core pressing from the outer circumferential surface of the radial direction of the rotor conductor
Including length to the outer peripheral surface, a length that causes the specific frequency and the air column resonance of the protruded rotor ventilation sound conductor occurs in
So that the length is different from the length causing the air column resonance
Cage induction motor, characterized in that the outer peripheral surface of the radial direction of the rotor core presser is formed.
で、軸方向断面がテーパ状に形成されていることを特徴
とする請求項１記載のかご形誘導電動機。2. The squirrel cage induction motor according to claim 1, wherein the rotor core retainer has a circular radial cross section and a tapered axial cross section.
で、軸方向断面が階段状に形成されていることを特徴と
する請求項１記載のかご形誘導電動機。3. The squirrel cage induction motor according to claim 1, wherein the rotor core retainer has a circular radial cross section and a stepwise axial cross section.
形状に形成されていることを特徴とする請求項１〜請求
項３のいずれか一項記載のかご形誘導電動機。4. The squirrel-cage induction motor according to claim 1, wherein the rotor core retainer has a mountain-shaped cross section in the axial direction.
形状に形成されていることを特徴とする請求項１〜請求
項３のいずれか一項記載のかご形誘導電動機。5. The squirrel cage induction motor according to claim 1, wherein the rotor core retainer has a valley-shaped cross section in the axial direction.
形に形成されていることを特徴とする請求項１記載のか
ご形誘導電動機。6. The squirrel cage induction motor according to claim 1, wherein the rotor core retainer has an elliptical cross section in the radial direction.
形状に形成されていることを特徴とする請求項１記載の
かご形誘導電動機。7. The squirrel cage induction motor according to claim 1, wherein the rotor core retainer has a polygonal cross section in the radial direction.
心、この固定子鉄心と空隙を介して回転可能に対向配置
された回転子鉄心、この回転子鉄心の側端面に当接配置
された回転子鉄心押さえ、上記回転子鉄心の外周部の溝
内に設けられて一部が鉄心の側端面から突出された複数
の回転子導体、この回転子導体の端部間を連結する短絡
環を備え、上記回転子鉄心押さえは、上記回転子鉄心の
側端面から突出された複数の回転子導体間に挿入され、
径方向に高さの異なる複数の突起部を有していることを
特徴とするかご形誘導電動機。8. A stator iron core having a winding for generating a rotating magnetic field, a rotor iron core rotatably opposed to the stator iron core via a gap, and a rotor iron core abuttingly arranged on a side end surface of the rotor iron core. Rotor core retainer, a plurality of rotor conductors provided in the groove of the outer peripheral portion of the rotor core and partly protruding from the side end surface of the core, and a short-circuit ring connecting the ends of the rotor conductors The rotor core retainer is inserted between a plurality of rotor conductors projected from a side end surface of the rotor core,
A squirrel-cage induction motor having a plurality of protrusions having different heights in the radial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17429798A JP3447565B2 (en) | 1998-06-22 | 1998-06-22 | Cage-shaped induction motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17429798A JP3447565B2 (en) | 1998-06-22 | 1998-06-22 | Cage-shaped induction motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000014104A JP2000014104A (en) | 2000-01-14 |
| JP3447565B2 true JP3447565B2 (en) | 2003-09-16 |
Family
ID=15976211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17429798A Expired - Lifetime JP3447565B2 (en) | 1998-06-22 | 1998-06-22 | Cage-shaped induction motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3447565B2 (en) |
-
1998
- 1998-06-22 JP JP17429798A patent/JP3447565B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000014104A (en) | 2000-01-14 |
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