JPH1080085A - Electronic rotary machine - Google Patents
Electronic rotary machineInfo
- Publication number
- JPH1080085A JPH1080085A JP23615396A JP23615396A JPH1080085A JP H1080085 A JPH1080085 A JP H1080085A JP 23615396 A JP23615396 A JP 23615396A JP 23615396 A JP23615396 A JP 23615396A JP H1080085 A JPH1080085 A JP H1080085A
- Authority
- JP
- Japan
- Prior art keywords
- neutral point
- neutral
- crossover
- points
- phase winding
- 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.)
- Pending
Links
Landscapes
- Windings For Motors And Generators (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は多相巻線を施した回
転電機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine having a multi-phase winding.
【０００２】[0002]
【従来の技術】三相巻線をＹ結線とした交流電動機用電
機子巻線では、例えば、特開平5− 161292号公報にも
例示されるように、反一次端子側を中性点で接続するよ
うに構成することになる。しかし、中性点の接続個数、
中性点同志の渡り線の線径について特定した記述はほと
んど見ない。ここで三相巻線のＹ結線の並列数を増加さ
せるに従ってこの中性点は複数に分布させた方がエンド
コイルの高さを低くできる場合が多い。また、中性点同
士の渡り線は均圧線の意味合いが強く設けない場合もあ
る程である。しかし中性点を多くするということはそれ
だけ接続箇所を増やすという事になり、作業工数の増加
と信頼性の低下を来すことになる。また、中性点を１個
所にすることによって接続作業は簡単になるが中性点部
に熱集中するという問題がある。2. Description of the Related Art In an armature winding for an AC motor in which a three-phase winding is Y-connected, an anti-primary terminal side is connected at a neutral point, as exemplified in Japanese Patent Application Laid-Open No. 5-161292. Will be configured. However, the number of connected neutral points,
Few descriptions specify the diameter of the crossover between neutral points. Here, as the number of parallel Y-connections of the three-phase windings is increased, it is often possible to reduce the height of the end coil by distributing the neutral points to a plurality of neutral points. In addition, the crossing line between the neutral points may not have a strong equalizing line. However, increasing the number of neutral points means increasing the number of connection points, which leads to an increase in the number of work steps and a decrease in reliability. In addition, connecting the neutral point to one place simplifies the connection work, but has a problem that heat is concentrated on the neutral point.
【０００３】[0003]
【発明が解決しようとする課題】本発明の目的はエンド
コイルの高さを最小にして、中性点の熱集中を回避でき
る中性点構造を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a neutral point structure capable of minimizing the height of an end coil and avoiding heat concentration at the neutral point.
【０００４】[0004]
【課題を解決するための手段】上記目的は、三相巻線の
中性点同士を接続する渡り線の線径と中性点の数を適正
にすることによって達成される。The above object is achieved by properly setting the diameter of the crossover connecting the neutral points of the three-phase windings and the number of the neutral points.
【０００５】本発明の中性点構成にすれば、中性点を最
少数にして接続工数を抑え、中性点の熱分散をして電動
機の負荷耐量を増加させられるばかりでなく、電動機の
エンドコイルの高さを抑えることができる。According to the neutral point configuration of the present invention, not only the number of neutral points can be reduced to a minimum, the number of connection steps can be reduced, and the heat load of the neutral points can be increased, but also the load capacity of the motor can be increased. The height of the end coil can be reduced.
【０００６】[0006]
【発明の実施の形態】本発明の中性点構成と、中性点１
個所の場合の比較を図１，図２により説明する。図１は
各相巻線がφ０.８５ を６本持ちとし各相４パラで単純
に中性点を１個所とした場合の結線図を示す。低電圧で
大電流形の三相電動機の場合に良く採用される回路構成
である。この場合の中性点１の体積をＶとし、この部分
の電気抵抗をＲとし、一相当りＩの電流が流れたときの
熱密度をαとする。ここで、中性点１のボリュウムを決
定する断面積Ｓは中性点として接続される素線２の総断
面積、すなわち、素線数で支配されることは自明の事で
ある。また、ボリュウムを決定する長さは中性点１の接
続長Ｌであることもまた自明の事である。従って、中性
点１の電気抵抗Ｒはこの中性点の断面積Ｓに反比例し、
長さＬに比例することになる。本発明者が中性点１の熱
密度αとしているのは、この中性点に発生するジュール
熱を中性点の体積で除したものである。従って、中性点
の熱密度を低減するには発生するジュール熱を減少させ
るか中性点の体積を増加させる必要がある。しかし熱密
度αが大きくなると１点に熱が集中するため中性点１の
温度上昇が増大し、この中性点がエンドコイル（図示せ
ず）に接触しているためエンドコイルの絶縁劣化が生じ
やすい。また中性点１を１個所にすると接続工数は最低
で済むが、中性点の膨らみが増し、電機子巻線の軸方向
寸法が増大する。BEST MODE FOR CARRYING OUT THE INVENTION The neutral point configuration of the present invention and the neutral point 1
The comparison in the case of a location will be described with reference to FIGS. FIG. 1 shows a connection diagram in a case where each phase winding has six φ0.85 and each phase has four neutral points and one neutral point simply. This is a circuit configuration often used in the case of a low-voltage, large-current three-phase motor. In this case, the volume of the neutral point 1 is represented by V, the electric resistance of this portion is represented by R, and the heat density when a current of I flows for one time is represented by α. Here, it is obvious that the cross-sectional area S that determines the volume of the neutral point 1 is governed by the total cross-sectional area of the wires 2 connected as the neutral points, that is, the number of wires. It is also obvious that the length for determining the volume is the connection length L of the neutral point 1. Therefore, the electrical resistance R of the neutral point 1 is inversely proportional to the cross-sectional area S of the neutral point,
It will be proportional to the length L. The inventor sets the heat density α at the neutral point 1 by dividing Joule heat generated at the neutral point by the volume of the neutral point. Therefore, to reduce the heat density at the neutral point, it is necessary to reduce the generated Joule heat or increase the volume of the neutral point. However, when the heat density α increases, heat is concentrated at one point, so that the temperature rise at the neutral point 1 increases. Since the neutral point contacts an end coil (not shown), insulation deterioration of the end coil is reduced. Easy to occur. Further, if the neutral point 1 is set at one place, the number of connection steps can be minimized, but the swelling of the neutral point increases, and the axial dimension of the armature winding increases.
【０００７】この問題を解決する中性点構造を図２によ
り説明する。図２は図１と同様に各相巻線がφ０.８５
を６本持ちとし各相４パラとした場合の結線図を示す。
図２では中性点１を２個所で構成し、しかも各中性点を
渡り線３で接続したものである。このように中性点を複
数設けた場合に理論的には各中性点の電位は等しいので
渡り線３は必要ないことになるが、実装上は電機子巻線
のアンバランスがあり全くの等電位にはならず、このよ
うな電動機をインバータで駆動し、しかも各相電流のア
ンバランスを監視して保護機能を動作させるような場合
には各中性点の均圧線としての渡り線３を設ける必要が
ある。さて、図２では渡り線３の線径として各相巻線と
同じくφ０.８５ を６本持ちとしたものであるが、この
ようにした中性点の熱密度α′を図１で検討したと同様
にしてみると、図１の熱密度αに対し各中性点の熱密度
α′は０.７３５ 倍になっていることが判る。すなわ
ち、図１と同じ電流でこの電動機を運転したときの中性
点１個所当りの温度上昇は約７５％に抑えることができ
る。また中性点１を２個所にすることによって接続工数
は最低という事にはならないが、中性点の膨らみが減少
し、電機子巻線の軸方向寸法が短縮できる。A neutral point structure for solving this problem will be described with reference to FIG. FIG. 2 shows that each phase winding is φ0.85 as in FIG.
Is a connection diagram in the case of having six lines and having four paras per phase.
In FIG. 2, the neutral point 1 is composed of two points, and each neutral point is connected by a crossover line 3. When a plurality of neutral points are provided in this way, the potential of each neutral point is theoretically the same, so that the crossover line 3 is not necessary. When such a motor is driven by an inverter and the imbalance of each phase current is monitored and the protection function is activated, the crossover wire as the equalizing line at each neutral point 3 must be provided. Now, in FIG. 2, the wire diameter of the crossover 3 has six φ 0.85 as in the case of each phase winding, and the heat density α ′ at the neutral point in this way was examined in FIG. 1. It can be seen that the heat density α ′ at each neutral point is 0.735 times the heat density α in FIG. That is, the temperature rise per neutral point when this motor is operated with the same current as in FIG. 1 can be suppressed to about 75%. By setting the neutral point 1 at two locations, the number of connection steps is not minimized, but the swelling of the neutral point is reduced, and the axial dimension of the armature winding can be reduced.
【０００８】本発明に基づき実機確認した結果を図３に
示す。図３は本発明者が開発した三相誘導電動機を６０
００ｒ／min ，１５７Ａで運転したときの各部の温度上
昇実測結果である。上段が中性点１個所（本明細書図１
の構成）でのもの、下段が中性点２個所に分割（本明細
書図２の構成）でのものである。上段実測温度が２７℃
から１７６℃まで１４９deg 温度上昇しているのに対
し、下段実測温度は２０℃から１２２℃まで１０２deg
の温度上昇であり、約７０％に低減している。FIG. 3 shows the result of confirmation of actual equipment based on the present invention. FIG. 3 shows a three-phase induction motor developed by the inventor of the present invention.
It is the measurement result of temperature rise of each part at the time of driving at 00r / min, 157A. The upper part is one neutral point (Fig. 1 in this specification).
The lower part is divided into two neutral points (the structure of FIG. 2 in this specification). Upper measured temperature is 27 ℃
Temperature rises from 149 ° C to 176 ° C, whereas the lower measured temperature is 102 ° from 20 ° C to 122 ° C.
, Which is reduced to about 70%.
【０００９】図２の熱密度算式に示すように、分子のジ
ュール熱低減のためには中性点分割数を増やせば良い
が、接続工数が増大し作業性，信頼性の悪化の可能性が
ある。一方、分母の中性点の体積増大のためには中性点
接続部の長さ伸長，渡り線の線径を増大させれば良いこ
とが容易に判る。中性点の接続部長さを伸長するとエン
ドコイル曲率から出張ったり、通電長さの有効分が低下
するという不具合が生じる。As shown in the heat density formula of FIG. 2, the number of neutral points may be increased in order to reduce the Joule heat of molecules, but the number of connection steps is increased, and the workability and reliability may be deteriorated. is there. On the other hand, it is easily understood that the volume of the neutral point in the denominator can be increased by increasing the length of the neutral point connecting portion and increasing the diameter of the crossover. Increasing the length of the connection point at the neutral point causes a problem such as a business trip due to the end coil curvature or a reduction in the effective component of the current-carrying length.
【００１０】同様に図示はしないが、渡り線を各相巻線
の線径の２倍とした場合、すなわちφ０.８５を１２本
持ちとした場合には、各中性点の熱密度は０.５６３倍
となり中性点１個所当りの温度上昇は約半分に抑えるこ
とができる。すなわち、電機子巻線の温度としてはエン
ドコイル温度を監視すれば特に中性点温度上昇に注目す
る必要がなくなる。Similarly, although not shown, when the crossover is twice the wire diameter of each phase winding, that is, when there are 12 φ0.85 wires, the heat density at each neutral point is 0. It becomes .563 times, and the temperature rise per neutral point can be suppressed to about half. That is, if the temperature of the end coil is monitored as the temperature of the armature winding, it is not necessary to pay particular attention to the neutral point temperature rise.
【００１１】今までは渡り線の線径と中性点の熱密度に
ついて言及してきたが、渡り線そのものがそれ程大きな
通電容量を必要としないものであることに注目すると、
本発明の他の実施例としては図示はしないが、渡り線そ
のものは必要最低限の線径とし、中性点接続部の体積を
所望の熱密度になるように形成した中性点構造とすれば
良いことは容易に推測できるところである。Although the wire diameter of the crossover and the heat density at the neutral point have been mentioned so far, it should be noted that the crossover itself does not require a large current carrying capacity.
Although not shown as another embodiment of the present invention, the crossover itself has a required minimum wire diameter and a neutral point structure formed so that the volume of the neutral point connection portion has a desired heat density. What is good is easy to guess.
【００１２】[0012]
【発明の効果】本発明の中性点構成にすれば、中性点を
最少数にして接続工数を抑え、中性点の熱分散をして電
動機の負荷耐量を増加させられるばかりでなく、電動機
のエンドコイルの高さを抑えることができる。According to the neutral point configuration of the present invention, not only the number of neutral points can be reduced to a minimum, the number of connection steps can be reduced, and the neutral point can be dissipated to increase the load capacity of the motor. The height of the end coil of the motor can be reduced.
【図１】一般的な三相巻線の説明図。FIG. 1 is an explanatory diagram of a general three-phase winding.
【図２】本発明の一実施例を示す一相あたり４パラの三
相巻線の説明図。FIG. 2 is an explanatory diagram of a three-phase winding having four paras per phase, showing one embodiment of the present invention.
【図３】本発明の一実施例の効果を示す温度上昇試験結
果の特性図。FIG. 3 is a characteristic diagram of a temperature rise test result showing an effect of one embodiment of the present invention.
１…中性点、２…素線、３…渡り線。 1 ... neutral point, 2 ... strand, 3 ... crossover.
Claims (6)
て、中性点を二箇所以上としたことを特徴とする回転電
機。1. A rotating electric machine having a Y-connected polyphase winding, wherein two or more neutral points are provided at a neutral point.
て、複数の中性点を各相巻線の線径でなる渡り線で接続
したことを特徴とする回転電機。2. A rotating electric machine having a Y-connected polyphase winding, wherein a plurality of neutral points are connected by a crossover having a wire diameter of each phase winding.
て、複数の中性点を各相巻線の線径以上の渡り線で接続
したことを特徴とする回転電機。3. A rotating electric machine having a Y-connected multi-phase winding, wherein a plurality of neutral points are connected by a crossover having a diameter equal to or greater than the wire diameter of each phase winding.
て、各相巻線の一端と複数の中性点を結ぶ渡り線の一端
を接続した中性点を、各相巻線の一端の総断面積と渡り
線の一端の断面積を合計したよりも大なる接続断面積と
した中性点構造を有することを特徴とする回転電機。4. In a rotating electric machine having a Y-connected multi-phase winding, a neutral point connecting one end of each phase winding and one end of a crossover wire connecting a plurality of neutral points is connected to each phase winding. A rotating electrical machine having a neutral point structure having a connection cross-sectional area larger than the sum of the total cross-sectional area of one end and the cross-sectional area of one end of a crossover.
巻線が細線の多本持ちである回転電機。5. The rotating electric machine according to claim 1, wherein each phase winding has multiple fine wires.
Ｙ結線の多相巻線が三相巻線の回転電機。6. The method of claim 1, 2, 3, 4, or 5,
A rotating electric machine in which the Y-connection polyphase winding has a three-phase winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23615396A JPH1080085A (en) | 1996-09-06 | 1996-09-06 | Electronic rotary machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23615396A JPH1080085A (en) | 1996-09-06 | 1996-09-06 | Electronic rotary machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1080085A true JPH1080085A (en) | 1998-03-24 |
Family
ID=16996556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23615396A Pending JPH1080085A (en) | 1996-09-06 | 1996-09-06 | Electronic rotary machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1080085A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7211913B2 (en) | 2004-06-23 | 2007-05-01 | Honda Motor Co., Ltd. | Motor cooling system |
| EP2395633A2 (en) | 2010-06-11 | 2011-12-14 | Hitachi Appliances, Inc. | Displacement compressor |
| JP2013219961A (en) * | 2012-04-11 | 2013-10-24 | Toyota Motor Corp | Rotary electric machine |
| JP2015012630A (en) * | 2013-06-26 | 2015-01-19 | 三菱電機株式会社 | Three-phase motor, sealed compressor, and refrigeration cycle device |
-
1996
- 1996-09-06 JP JP23615396A patent/JPH1080085A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7211913B2 (en) | 2004-06-23 | 2007-05-01 | Honda Motor Co., Ltd. | Motor cooling system |
| EP2395633A2 (en) | 2010-06-11 | 2011-12-14 | Hitachi Appliances, Inc. | Displacement compressor |
| CN102278294A (en) * | 2010-06-11 | 2011-12-14 | 日立空调·家用电器株式会社 | Displacement compressor |
| JP2013219961A (en) * | 2012-04-11 | 2013-10-24 | Toyota Motor Corp | Rotary electric machine |
| JP2015012630A (en) * | 2013-06-26 | 2015-01-19 | 三菱電機株式会社 | Three-phase motor, sealed compressor, and refrigeration cycle device |
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