JP3601118B2 - Motor with stator winding - Google Patents
Motor with stator winding Download PDFInfo
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- JP3601118B2 JP3601118B2 JP16033095A JP16033095A JP3601118B2 JP 3601118 B2 JP3601118 B2 JP 3601118B2 JP 16033095 A JP16033095 A JP 16033095A JP 16033095 A JP16033095 A JP 16033095A JP 3601118 B2 JP3601118 B2 JP 3601118B2
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- Prior art keywords
- stator winding
- coil
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Description
【０００１】
【産業上の利用分野】
本発明は、固定子巻線を有する電動機にあって、インバータを用いる場合サージ対策として新たな構造とした固定子巻線を有する電動機に関する。
【０００２】
【従来の技術】
電動機の制御にあってＰＷＭ制御によりインバータを運転する場合、例えば４００Ｖ級のインバータにあっては、敷設ケーブル長により電動機側にて高電圧が発生するという現象がある。これは図６に示すようにインバータ１と電動機２との間の配線腕のインダクタンス（Ｌ）と配線間浮遊容量（Ｃ）との値により、スイッチングにてＬＣ共振にて生じたサージ電圧がインバータ１の出力電圧に重畳され、この結果電動機端子電圧のピーク値が高くなることによる。
従来では、このサージ電圧を抑制するためサージアブソーバ等を備えるという対策が採られている。
【０００３】
【発明が解決しようとする課題】
ところが、小形電動機の制御においては、多くの場合サージアブソーバ等を備えるスペースは無く、サージアブソーバを備えるべく取付座等を設けたりするに当っては、サージアブソーバとは別の費用が必要となってサージアブソーバを含め全体としてコスト高となる。
【０００４】
本発明は、スペースの確保やコスト高を防止すべくサージ電圧に対する絶縁強化を図った固定子巻線を有する電動機の提供を目的とする。
【０００５】
【課題を解決するための手段】
上記の目的を達成する本発明は、
（１）インバータにて固定子巻線を駆動する電動機において、上記固定子巻線の電源側第１スロットコイルは、スロット内及びコイルエンド部にて２分割し、この２分割した第１スロットコイル内に絶縁紙を挿入する、ことを特徴とし、
（２）インバータにて固定子巻線を駆動する電動機において、上記固定子巻線の電源側の第１スロットコイルと第２スロットコイルとの間にあってコイルエンド部に絶縁紙を挿入した、ことを特徴とし、
（３）上記（１）又は（２）にあって、上記固定子巻線の並列回路数を１又は極力少なくし、固定子巻線全体はＹ結線とすることを特徴とし、
（４）インバータにて固定子巻線を駆動する電動機において、上記固定子巻線の電源側第１スロットコイルはスロット内及びコイルエンド部にて２分割し、この２分割した第１スロットコイル内に絶縁紙を挿入し、上記固定巻線の電源側第１スロットコイルと第２スロットコイルとの間にあってコイルエンド部に絶縁紙を挿入し、更に、上記固定子巻線の並列回路数を１又は極力少なくし固定子巻線全体はＹ結線とすることを特徴とする。
【０００６】
【作用】
ここで、サージ電圧についてその特性等を説明する。回転機の巻線は図７に示すように一相分のコイル群が何グループかに分かれ、低圧機器の場合１グループは同一スロットに収納されることになり、この結果、同一グループの巻き始め（ａ点）と巻き終り（ｂ点）とが素線のままにて接する。かかる構造にあってサージ電圧が侵入すると、この素線間（ａ−ｂ）に過大電圧が加わることになる。
通常の商用電源では、電圧は各巻線グループに均等に分担されるが、サージ電圧の場合分担は均等でなく、伝ぱん速度が有限でありしゅん度により１グループのみにサージ電圧が加わることがある。
即ち、図８に示すようにサージが急しゅんであればａ点は波頭又はその近くの値となり、ゆるやかであれば低電圧しか到達しないこととなって、例えば図８中のＥ１ Ｅ２ になる。
このａ，ｂ間の電圧を数式にて表わすと
次のようになる。
Ｖａｂ＝（ｌａｂ／ｖ）・（Ｅ／ｔｆ ）
ここで、Ｖａｂはａｂ間の電圧（ｖ）、ｌａｂはａｂ間の線路ながあ（ｍ）、ｖはサージの伝速度（８，８×１０６ ｍ／ｓｅｃ）、Ｅはサージの波頭電圧（Ｖ）、ｔｆ はサージ波頭立より時間（ｓｅｃ）となる。
こうして、ａｂ間に波頭が到達した場合には、ａｂ間に最も放電が発生しやすくなり、一般にはこのサージ電圧による繰り返し放電にて絶縁劣化が進行して破壊に到ることになる。
【０００７】
かかるサージ電圧が巻線素線間に加わらないようにしたのが本発明であり、絶縁補強をしたり巻線に工夫をこらすことによって高電圧の分担を減らしたものである。
【０００８】
【実施例】
ここで、図１ないし図５を参照して本発明の実施例を説明する。
図１は、電動機の固定子鉄心３並びに固定子巻線４の一部を示しており、電源側の第１スロットコイル４ａと第２スルットコイル４ｂとを主に示している。この実施例では、電源側の第１スロットコイル４ａと第２スロットコイル４ｂとの間にあって、コイルエンド部には絶縁紙が介在されている。この絶縁紙は第１スロットコイル４ａと第２スロットコイエル４ｂとのコイルエンド部での絶縁補強となる。
【０００９】
図２は、本発明の他の実施例であり、電源側の第１スロットコイル４ａを２分割して４ａ１と４ａ２としこの２分割のものスロット内もしくはコイルエンド部にてを絶縁紙を挿入する。
図３は、２分割した第１スロットコイル４ａ１と４ａ２との断面を示しており、単層巻き及び２層巻きの場合を示している。２層巻きの場合には下層導体を２分割コイル４ａ１，４ａ２とし上層導体は分割しない構造となっている。なお、短節巻きにより上下層共２分割構造になる場合もある。
このために、第１スロットコイル４ａを絶縁補強することができる。
【００１０】
図４は、電源側の第１スロットコイル４ａでの高電圧分担を減少させるべく並列回路を減少させ更にはΔ結線をＹ結線とする例を模擬的に示しており、高電圧を分担する箇所を少なくする。図４では並列４回路を１回路とし、Δ結線をＹ結線としており、並列回路の減少にて高電圧分担箇所を１／４に減少させ、Δ→Ｙにより高電圧分担箇所を１／２に減少できる。図４ではＸ箇所が高電圧分担箇所で４並列回路では２４箇所Δ結線では６箇所Ｙ結線では３箇所となる。
図５は図４を実施の巻線と対応させ表わした図である。
【００１１】
【発明の効果】
以上説明したように本発明によれば、巻線絶縁を強化すると共に高圧分担箇所を少なくすることができ、インバータ運転時のスイッチングサージに対して電動機にサージアブソーバ等を設けることなく安価に対応することができる。
【図面の簡単な説明】
【図１】電源側固定子巻線の一部を示す一実施例の図。
【図２】電源側固定子巻線の一部を示す他の実施例の図。
【図３】２分割コイルの簡略断面図。
【図４】高圧分担箇所を減少させる巻線の模擬図。
【図５】図４と巻線との対応図。
【図６】インバータと電動機との線路インピーダンス説明図。
【図７】一相分のコイルの説明図。
【図８】サージ電圧の説明図。
【符号の説明】
４ 固定子巻線
４ａ，４ａ１，４ａ２ 第１スロットコイル
４ｂ 第２スロットコイル[0001]
[Industrial applications]
The present invention relates to an electric motor having a stator winding, and more particularly to an electric motor having a stator winding having a new structure as a measure against surge when an inverter is used.
[0002]
[Prior art]
When the inverter is operated by PWM control in the control of the motor, for example, in the case of a 400 V class inverter, there is a phenomenon that a high voltage is generated on the motor side due to the length of the laid cable. This is because, as shown in FIG. 6, the surge voltage generated by the LC resonance by the switching causes the inverter voltage and the inductance (L) of the wiring arm between the inverter 1 and the
Conventionally, measures have been taken to provide a surge absorber or the like to suppress the surge voltage.
[0003]
[Problems to be solved by the invention]
However, in the control of small motors, in many cases, there is no space for providing a surge absorber and the like, and in order to provide a mounting seat or the like for providing a surge absorber, a separate cost from the surge absorber is required. The cost is high as a whole, including the surge absorber.
[0004]
An object of the present invention is to provide a motor having a stator winding in which insulation against surge voltage is reinforced in order to secure a space and prevent an increase in cost.
[0005]
[Means for Solving the Problems]
The present invention that achieves the above objects,
(1) In a motor in which a stator winding is driven by an inverter, a power supply side first slot coil of the stator winding is divided into two in a slot and a coil end portion, and the divided first slot coil is divided into two. Inserting insulating paper into the inside,
(2) In an electric motor in which a stator winding is driven by an inverter, insulating paper is inserted into a coil end portion between the first slot coil and the second slot coil on the power supply side of the stator winding. Features and
(3) In the above (1) or (2), the number of parallel circuits of the stator winding is reduced to one or as small as possible, and the whole stator winding is Y-connected.
(4) In the electric motor in which the stator winding is driven by the inverter, the power supply side first slot coil of the stator winding is divided into two in the slot and the coil end portion, and in the first divided slot coil. Insulating paper is inserted between the first and second slot coils on the power supply side of the fixed winding, and insulating paper is inserted into the coil end portion. Alternatively, it is characterized in that the entire stator winding is made Y-connection as much as possible.
[0006]
[Action]
Here, the characteristics and the like of the surge voltage will be described. As shown in FIG. 7, the windings of the rotating machine are divided into several groups of one-phase coils, and in the case of low-voltage equipment, one group is housed in the same slot. The point (a) and the end of the winding (point b) are in contact with each other as they are. When a surge voltage enters in such a structure, an excessive voltage is applied between the wires (ab).
In a normal commercial power supply, the voltage is equally distributed to each winding group, but in the case of surge voltage, the distribution is not equal, the transmission speed is finite, and the surge voltage may be applied to only one group depending on the degree of penetration. .
That is, as shown in FIG. 8, if the surge is steep, the point a has a value at or near the wave front, and if it is gentle, only a low voltage will be reached. For example, E 1 E 2 in FIG. Become.
The voltage between a and b is expressed by the following equation.
V ab = (I ab / v) · (E / t f )
Here, V ab is the voltage (v) between a and ab , lab is the line between a and a (m), v is the transmission speed of the surge (8.8 × 10 6 m / sec), and E is the wavefront voltage (V), t f is the surge wave crest elevation than the time (sec).
In this way, when the wave front reaches between a and ab, discharge is most likely to occur between a and a, and generally, the insulation is degraded due to the repeated discharge caused by the surge voltage, leading to destruction.
[0007]
The present invention prevents such a surge voltage from being applied between the winding wires, and reduces the sharing of high voltage by reinforcing the insulation or devising the winding.
[0008]
【Example】
Here, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a part of a
[0009]
FIG. 2 shows another embodiment of the present invention, in which the first slot coil 4a on the power supply side is divided into two parts 4a1 and 4a2, and insulating paper is inserted into the slots or at the coil end of the two divided parts. .
FIG. 3 shows a cross section of the first slot coils 4a1 and 4a2 divided into two, and shows the case of single-layer winding and two-layer winding. In the case of two-layer winding, the lower conductor is divided into two split coils 4a1 and 4a2, and the upper conductor is not split. In some cases, the upper and lower layers may have a two-part structure by short-section winding.
For this reason, the first slot coil 4a can be reinforced and insulated.
[0010]
FIG. 4 schematically shows an example in which the parallel circuit is reduced in order to reduce the high voltage sharing in the first slot coil 4a on the power supply side, and the Δ connection is changed to the Y connection. Less. In FIG. 4, four parallel circuits are one circuit, and Δ connection is Y connection. The high voltage sharing part is reduced to ４ by reducing the number of parallel circuits, and the high voltage sharing part is reduced to に よ り by Δ → Y. Can be reduced. In FIG. 4, X points are high voltage sharing points, and in a 4-parallel circuit, there are 24 places Δ connection, 6 places and Y connection, 3 places.
FIG. 5 is a diagram showing FIG. 4 in correspondence with the embodiment windings.
[0011]
【The invention's effect】
As described above, according to the present invention, it is possible to strengthen the winding insulation and reduce the number of high-voltage sharing portions, and to cope with switching surge during inverter operation at a low cost without providing a surge absorber or the like in the motor. be able to.
[Brief description of the drawings]
FIG. 1 is a diagram of one embodiment showing a part of a power source side stator winding.
FIG. 2 is a diagram of another embodiment showing a part of a power source side stator winding.
FIG. 3 is a simplified sectional view of a two-piece coil.
FIG. 4 is a schematic diagram of a winding for reducing a high-voltage sharing portion.
FIG. 5 is a diagram showing correspondence between FIG. 4 and windings.
FIG. 6 is an explanatory diagram of line impedance between an inverter and a motor.
FIG. 7 is an explanatory diagram of a coil for one phase.
FIG. 8 is an explanatory diagram of a surge voltage.
[Explanation of symbols]
4 Stator windings 4a, 4a1, 4a2 First slot coil 4b Second slot coil
Claims (4)
上記固定子巻線の電源側第１スロットコイルは、スロット内及びコイルエンド部にて２分割し、
この２分割した第１スロットコイル内に絶縁紙を挿入する、
ことを特徴とする固定子巻線を有する電動機。In a motor that drives a stator winding with an inverter,
The power supply side first slot coil of the stator winding is divided into two in the slot and at the coil end,
Insulating paper is inserted into the first slot coil divided into two,
An electric motor having a stator winding.
上記固定子巻線の電源側の第１スロットコイルと第２スロットコイルとの間にあってコイルエンド部に絶縁紙を挿入した、
ことを特徴とする固定子巻線を有する電動機。In a motor that drives a stator winding with an inverter,
Insulating paper was inserted into the coil end portion between the first slot coil and the second slot coil on the power supply side of the stator winding,
An electric motor having a stator winding.
上記固定子巻線の電源側第１スロットコイルはスロット内及びコイルエンド部にて２分割し、この２分割した第１スロットコイル内に絶縁紙を挿入し、
上記固定巻線の電源側第１スロットコイルと第２スルットコイルとの間にあってコイルエンド部に絶縁紙を挿入し、
更に、上記固定子巻線の並列回路数を１又は極力少なくし固定子巻線全体はＹ結線とすることを特徴とする固定子巻線を有する電動機。In a motor that drives a stator winding with an inverter,
The power supply side first slot coil of the stator winding is divided into two in the slot and the coil end portion, and an insulating paper is inserted into the divided first slot coil,
An insulating paper is inserted into the coil end portion between the power supply side first slot coil and the second slot coil of the fixed winding,
Further, an electric motor having a stator winding, wherein the number of parallel circuits of the stator winding is reduced to one or as small as possible, and the whole stator winding is Y-connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16033095A JP3601118B2 (en) | 1995-06-27 | 1995-06-27 | Motor with stator winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16033095A JP3601118B2 (en) | 1995-06-27 | 1995-06-27 | Motor with stator winding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0919096A JPH0919096A (en) | 1997-01-17 |
| JP3601118B2 true JP3601118B2 (en) | 2004-12-15 |
Family
ID=15712637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16033095A Expired - Lifetime JP3601118B2 (en) | 1995-06-27 | 1995-06-27 | Motor with stator winding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3601118B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998054822A1 (en) * | 1997-05-26 | 1998-12-03 | Denso Corporation | Ac generator for vehicle |
| JP4539263B2 (en) * | 2003-09-25 | 2010-09-08 | 株式会社デンソー | Motor stator and coil forming method thereof |
| JP2006109662A (en) * | 2004-10-08 | 2006-04-20 | Meidensha Corp | Wiring insulation structure for rotary electric machine |
| JP4826736B2 (en) * | 2005-11-22 | 2011-11-30 | ダイキン工業株式会社 | Armature |
| WO2011148501A1 (en) * | 2010-05-28 | 2011-12-01 | トヨタ自動車株式会社 | Stator |
-
1995
- 1995-06-27 JP JP16033095A patent/JP3601118B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0919096A (en) | 1997-01-17 |
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