JP2009092527A - Method of inspecting insulation of stator winding in rotary electric machine - Google Patents
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Abstract
Description
本発明は、乗用車やトラック等に搭載される発電機等の回転電機における固定子巻線の絶縁検査方法に関する。 The present invention relates to an insulation inspection method for a stator winding in a rotating electrical machine such as a generator mounted on a passenger car, a truck, or the like.
従来より、回転電機における巻線の絶縁状態を検査する場合、検査対象となる巻線にサージ電圧を印加し、その巻線に発生する電圧変化を観察して絶縁の良否を判断する技術が用いられている。例えば、特許文献１に記載の小型電気機械の非破壊絶縁試験法及び装置や、特許文献２に記載の電機設備診断システムでは、巻線間の絶縁チェックとして、巻線の巻き始め端から巻き終り端（或いは中性点）までの巻線全体に電圧を印加している。
しかしながら、一般に、パルス電圧が巻線内を伝搬する場合、自身の高周波特性およびコアとの静電結合のため巻線中央部で減衰する。そのため、巻線中央部に所望の試験電圧を加えたい場合、端子に過剰な電圧を加える必要があるが、過剰な電圧を印加する端部付近の巻線間や巻線とコア間の絶縁部位において部分放電が発生して正しい検査を行うことができない場合があるという問題や、部分放電の発生に起因して絶縁破壊などの絶縁劣化を引き起こすという問題があった。 However, in general, when a pulse voltage propagates in the winding, it attenuates at the center of the winding due to its own high frequency characteristics and electrostatic coupling with the core. Therefore, if you want to apply a desired test voltage to the center of the winding, it is necessary to apply an excessive voltage to the terminal, but between the windings near the end where the excessive voltage is applied and between the winding and the core In some cases, a partial discharge may occur and correct inspection may not be performed, and there may be a problem of causing insulation deterioration such as dielectric breakdown due to the occurrence of partial discharge.
本発明は上記課題に鑑みてなされたものであり、巻線内の目的部位以外での過大な電圧による部分放電の発生を防止して目的部位の絶縁健全性を確実に検査することができる回転電機における固定子巻線の絶縁検査方法を提供することを目的とする。 The present invention has been made in view of the above-described problems, and can prevent the occurrence of partial discharge due to an excessive voltage other than the target portion in the winding, and can reliably check the insulation soundness of the target portion. An object of the present invention is to provide a method for inspecting insulation of a stator winding in an electric machine.
以下、上記課題を解決するのに適した各手段につき、必要に応じて作用効果等を付記しつつ説明する。 Hereinafter, each means suitable for solving the above-described problems will be described with additional effects and the like as necessary.
１．回転電機の固定子鉄心に装備された固定子巻線の絶縁検査方法であって、パルス電圧発生装置の高電位側端子と低電位側端子とを前記固定子巻線の互いに異なる部位にそれぞれ接続してパルス電圧を印加し、前記固定子巻線に発生する電圧変化を観測して絶縁の良否を判定する回転電機における固定子巻線の絶縁検査方法において、
前記固定子巻線は、巻き始め端と巻き終り端との間に少なくとも一つの導体露出部を有するものであり、
前記パルス電圧発生装置の前記高電位側端子及び前記低電位側端子の一方を前記固定子巻線の前記導体露出部に接続し、他方を前記固定子巻線の他の前記導体露出部、前記巻き始め端、又は前記巻き終り端に接続して前記パルス電圧を印加することを特徴とする回転電機における固定子巻線の絶縁検査方法。
1. A method for inspecting insulation of a stator winding mounted on a stator core of a rotating electrical machine, wherein a high potential side terminal and a low potential side terminal of a pulse voltage generator are connected to different portions of the stator winding, respectively. In the method of inspecting the insulation of the stator winding in the rotating electrical machine, applying a pulse voltage, observing the voltage change generated in the stator winding and judging the quality of the insulation,
The stator winding has at least one conductor exposed portion between a winding start end and a winding end end,
One of the high potential side terminal and the low potential side terminal of the pulse voltage generator is connected to the conductor exposed portion of the stator winding, and the other is connected to the other conductor exposed portion of the stator winding, A method for inspecting insulation of a stator winding in a rotating electrical machine, wherein the pulse voltage is applied by connecting to a winding start end or a winding end end.
手段１によれば、パルス電圧発生装置の高電位側端子及び低電位側端子の一方を固定子巻線の巻き始め端と巻き終り端との間に設けられた導体露出部に接続し、他方を固定子巻線の他の導体露出部、巻き始め端、又は巻き終り端に接続してパルス電圧を印加するので、固定子巻線の目的部位に所定のパルス電圧を印加することができ、且つ目的部位以外において過大な電圧の印加による部分放電の発生を防止して、目的部位の絶縁健全性を確実に検査することができる。 According to the means 1, one of the high potential side terminal and the low potential side terminal of the pulse voltage generator is connected to the conductor exposed portion provided between the winding start end and the winding end end of the stator winding, and the other Is connected to the other conductor exposed portion of the stator winding, the winding start end, or the winding end end, and a pulse voltage is applied, so that a predetermined pulse voltage can be applied to the target portion of the stator winding, In addition, it is possible to prevent the occurrence of partial discharge due to application of an excessive voltage other than the target portion, and to reliably inspect the insulation soundness of the target portion.
２．前記固定子巻線は、前記固定子鉄心に形成されたスロット内において複数の略Ｕ字状又は略Ｖ字状の導体セグメントを径方向に沿って配列し、前記固定子鉄心の軸方向両端面から突出する前記複数の導体セグメントの端部同士を互いに接合して複数の接続部を有するエンド部を形成するものであり、
前記導体露出部は、前記複数の接続部であることを特徴とする手段１に記載の回転電機における固定子巻線の絶縁検査方法。
2. The stator winding has a plurality of substantially U-shaped or substantially V-shaped conductor segments arranged in a radial direction in a slot formed in the stator core, and both axial end surfaces of the stator core. The end portions of the plurality of conductor segments projecting from each other are joined together to form an end portion having a plurality of connection portions,
The method for inspecting insulation of a stator winding in a rotating electrical machine according to means 1, wherein the conductor exposed portions are the plurality of connecting portions.
手段２によれば、パルス電圧発生装置の高電位側端子及び低電位側端子の一方を、固定子鉄心の軸方向両端面から突出する複数の導体セグメントの端部同士を互いに接合してなる複数の接続部のいずれかに接続し、他方を固定子巻線の他の接続部、巻き始め端、又は巻き終り端に接続してパルス電圧を印加するので、固定子巻線の目的部位に所定のパルス電圧を印加することができ、且つ目的部位以外において過大な電圧の印加による部分放電の発生を防止して、目的部位の絶縁健全性を確実に検査することができる。 According to the means 2, one of the high potential side terminal and the low potential side terminal of the pulse voltage generator is connected to the ends of the plurality of conductor segments protruding from both axial end surfaces of the stator core. The other end of the stator winding is connected to the other connection portion of the stator winding, the winding start end, or the winding end end, and a pulse voltage is applied, so that a predetermined voltage is applied to the target portion of the stator winding. And the occurrence of partial discharge due to the application of an excessive voltage other than the target portion can be prevented, and the insulation soundness of the target portion can be reliably inspected.
３．前記固定子鉄心の同一スロット内で互いに隣接して配置される同相の一方の巻線部と他方の巻線部との間の絶縁健全性を検査する場合、前記パルス電圧発生装置の前記高電位側端子を前記一方の巻線部を構成する前記複数の導体セグメントのすべての前記接続部に接続すると共に、前記低電位側端子を前記他方の巻線部を構成する前記複数の導体セグメントのすべての前記接続部に接続して、前記パルス電圧を印加することを特徴とする手段２に記載の回転電機における固定子巻線の絶縁検査方法。 3. When inspecting the insulation soundness between one winding part and the other winding part of the same phase arranged adjacent to each other in the same slot of the stator core, the high potential of the pulse voltage generator The side terminal is connected to all the connection portions of the plurality of conductor segments constituting the one winding portion, and the low potential side terminal is connected to all of the plurality of conductor segments constituting the other winding portion. A method for inspecting insulation of a stator winding in a rotating electrical machine according to claim 2, wherein the pulse voltage is applied to the connection portion.
手段３によれば、固定子鉄心の同一スロット内で互いに隣接して配置される同相の一方の巻線部と他方の巻線部との間の絶縁健全性を検査する場合、パルス電圧発生装置の高電位側端子を一方の巻線部を構成する複数の導体セグメントのすべての接続部に接続すると共に、低電位側端子を他方の巻線部を構成する複数の導体セグメントのすべての接続部に接続してパルス電圧を印加する。よって、固定子巻線の目的部位である固定子鉄心の同一スロット内で互いに隣接して配置される同相の一方の巻線部と他方の巻線部との間に電圧低下を伴うことなく所定のパルス電圧を印加することができ、且つ目的部位以外において過大な電圧の印加による部分放電の発生を防止して、目的部位の絶縁健全性を確実に検査することができる。 According to the means 3, when inspecting the insulation soundness between one winding part and the other winding part of the same phase arranged adjacent to each other in the same slot of the stator core, the pulse voltage generator The high-potential side terminal is connected to all the connecting portions of the plurality of conductor segments constituting one winding portion, and the low-potential side terminal is connected to all the connecting portions of the plurality of conductor segments constituting the other winding portion. Apply pulse voltage by connecting to. Therefore, a predetermined voltage is not generated between one winding portion and the other winding portion of the same phase arranged adjacent to each other in the same slot of the stator core that is a target portion of the stator winding. And the occurrence of partial discharge due to the application of an excessive voltage other than the target portion can be prevented, and the insulation soundness of the target portion can be reliably inspected.
４．前記エンド部で互いに隣接して配置される異相の一方の巻線部と他方の巻線部との間の絶縁健全性を検査する場合、前記パルス電圧発生装置の前記高電位側端子を前記一方の巻線部を構成する前記導体セグメントの前記接続部及び前記一方の巻線部と前記固定子鉄心の同一スロット内で互いに隣接して配置される同相の巻線部の前記接続部に接続すると共に、前記低電位側端子を前記他方の巻線部を構成する前記導体セグメントの前記接続部及び前記他方の巻線部と前記固定子鉄心の同一スロット内で互いに隣接して配置される同相の巻線部の前記接続部に接続して、前記パルス電圧を印加することを特徴とする手段２に記載の回転電機における固定子巻線の絶縁検査方法。 4). When inspecting the insulation soundness between one winding portion and the other winding portion of different phases arranged adjacent to each other at the end portion, the high potential side terminal of the pulse voltage generator is the one And connecting to the connection portion of the in-phase winding portion arranged adjacent to each other in the same slot of the stator core and the connection portion of the conductor segment and the one winding portion constituting the winding portion of In addition, the low-potential side terminals are arranged in the same phase so as to be adjacent to each other in the same slot of the stator core and the connection portion of the conductor segment constituting the other winding portion and the other winding portion. The method for inspecting the insulation of a stator winding in a rotating electrical machine according to claim 2, wherein the pulse voltage is applied to the connection portion of the winding portion.
手段４によれば、エンド部で互いに隣接して配置される異相の一方の巻線部と他方の巻線部との間の絶縁健全性を検査する場合、パルス電圧発生装置の高電位側端子を一方の巻線部を構成する導体セグメントの接続部及び一方の巻線部と固定子鉄心の同一スロット内で互いに隣接して配置される同相の巻線部の接続部に接続すると共に、低電位側端子を他方の巻線部を構成する導体セグメントの接続部及び他方の巻線部と固定子鉄心の同一スロット内で互いに隣接して配置される同相の巻線部の接続部に接続してパルス電圧を印加する。よって、固定子巻線の目的部位であるエンド部で互いに隣接して配置される異相の一方の巻線部と他方の巻線部との間に所定のパルス電圧を印加することができ、且つ目的部位以外である同一スロット内で互いに隣接して配置される同相の巻線部間で過大な電圧の印加による部分放電の発生を防止して、目的部位の絶縁健全性を確実に検査することができる。 According to the means 4, when inspecting the insulation soundness between one winding part and the other winding part of different phases arranged adjacent to each other at the end part, the high potential side terminal of the pulse voltage generator Are connected to the connecting part of the conductor segment constituting one winding part and the connecting part of the winding part of the same phase arranged adjacent to each other in the same slot of the one winding part and the stator core. The potential side terminal is connected to the connecting portion of the conductor segment constituting the other winding portion and the connecting portion of the other winding portion and the in-phase winding portion arranged adjacent to each other in the same slot of the stator core. Apply a pulse voltage. Therefore, a predetermined pulse voltage can be applied between one winding portion and the other winding portion of different phases arranged adjacent to each other at an end portion which is a target portion of the stator winding, and To prevent the occurrence of partial discharge due to the application of an excessive voltage between in-phase windings arranged adjacent to each other in the same slot other than the target part, and reliably check the insulation soundness of the target part Can do.
以下、本発明の回転電機における固定子巻線の絶縁検査方法を具体化した一実施形態について図面を参照しつつ具体的に説明する。図１は、本発明の一実施形態である固定子巻線の絶縁検査方法を説明するための回路図である。 Hereinafter, an embodiment in which a method of inspecting insulation of a stator winding in a rotating electrical machine of the present invention is specifically described with reference to the drawings. FIG. 1 is a circuit diagram for explaining a stator winding insulation inspection method according to an embodiment of the present invention.
図１において、固定子巻線１が本実施形態の絶縁検査方法によって検査される固定子巻線である。固定子巻線１は、巻き始め端２と巻き終り端３との間に複数の導体露出部４が設けられている。 In FIG. 1, a stator winding 1 is a stator winding inspected by the insulation inspection method of the present embodiment. In the stator winding 1, a plurality of exposed conductors 4 are provided between a winding start end 2 and a winding end end 3.
また、本実施形態の絶縁検査方法には、図１に示すように、パルス電圧発生装置５と、部分放電検出器８と、電圧波形モニタ１０とが使用される。以下、各装置の概略について説明する。 Further, as shown in FIG. 1, a pulse voltage generator 5, a partial discharge detector 8, and a voltage waveform monitor 10 are used in the insulation inspection method of the present embodiment. The outline of each device will be described below.
パルス電圧発生装置５は、パルス電圧を発生可能な公知の装置であり、装置本体５ａと、装置本体５ａから延出されて先端に＋端子６を設けた高電位側のリード線５ｂと、同じく装置本体５ａから延出されて先端に−端子７を設けた低電位側のリード線５ｃとを備えている。また、リード線５ｃは、アース１３に接続されている。図２は、パルス電圧発生装置５によって発生されるパルス電圧波形の一例を示す図である。尚、＋端子６が本発明の高電位側端子を、−端子７が低電位側端子をそれぞれ構成するものである。 The pulse voltage generation device 5 is a known device capable of generating a pulse voltage, and is similar to the device main body 5a and the high potential side lead wire 5b extending from the device main body 5a and provided with a + terminal 6 at the tip. A low-potential side lead wire 5c extending from the apparatus main body 5a and having a negative terminal 7 provided at the tip thereof is provided. Further, the lead wire 5 c is connected to the ground 13. FIG. 2 is a diagram illustrating an example of a pulse voltage waveform generated by the pulse voltage generator 5. The positive terminal 6 constitutes the high potential side terminal of the present invention, and the negative terminal 7 constitutes the low potential side terminal.
部分放電検出器８は、部分放電の発生を検出可能な公知の装置であり、部分放電検出センサ９（電流センサ）による検出結果の入力により部分放電波形を出力できるようになっている。尚、部分放電は、絶縁部位によって決定される所定の印加電圧値以上で発生し、発生電圧を部分放電電圧としてその電圧の大小によって絶縁性能が判定される。部分放電開始電圧は、例えば皮膜厚が薄い場合や皮膜にボイドが発生する場合に低下する。 The partial discharge detector 8 is a known device capable of detecting the occurrence of partial discharge, and can output a partial discharge waveform by inputting a detection result from the partial discharge detection sensor 9 (current sensor). The partial discharge is generated at a predetermined applied voltage value or more determined by the insulating portion, and the insulation performance is determined by the magnitude of the generated voltage as the partial discharge voltage. The partial discharge start voltage decreases, for example, when the film thickness is thin or when a void occurs in the film.
電圧波形モニタ１０は、電圧変化を検出して電圧波形を出力可能な公知のモニタ装置であり、モニタ本体１０から一対のリード線１１，１２が延出されている。 The voltage waveform monitor 10 is a known monitor device capable of detecting a voltage change and outputting a voltage waveform, and a pair of lead wires 11 and 12 are extended from the monitor main body 10.
次に、上述した各装置を用いた具体的な絶縁検査方法について説明する。まず、図１に示すように、固定子巻線１における絶縁検査の対象部分である巻線部１ｂの一端側の導体露出部４にパルス電圧発生装置５の＋端子６を接続し、巻線部１ｂの他端側の導体露出部４に−端子７を接続する。また、部分放電検出センサ９をパルス電圧発生装置５の＋端子６側のリード線５ｂに設置する。さらに、電圧波形モニタ１０のリード線１１をパルス電圧発生装置５の＋端子６側のリード線５ｂに接続し、リード線１２を−端子７側のリード線５ｃに接続する。 Next, a specific insulation inspection method using each device described above will be described. First, as shown in FIG. 1, a positive terminal 6 of a pulse voltage generator 5 is connected to a conductor exposed portion 4 on one end side of a winding portion 1b that is a target portion of an insulation test in the stator winding 1, and the winding The minus terminal 7 is connected to the conductor exposed portion 4 on the other end side of the portion 1b. Further, the partial discharge detection sensor 9 is installed on the lead wire 5 b on the + terminal 6 side of the pulse voltage generator 5. Further, the lead wire 11 of the voltage waveform monitor 10 is connected to the lead wire 5b on the + terminal 6 side of the pulse voltage generator 5, and the lead wire 12 is connected to the lead wire 5c on the -terminal 7 side.
このようにして検査の準備が整った後、パルス電圧発生装置５の装置本体５ａより図２に示すようなパルス電圧を発生させ、＋端子６及び−端子７を介して巻線部１ｂにパルス電圧を印加する。そして、パルス電圧の印加によって巻線部１ｂに発生する電圧変化を部分放電検出器８や波形モニタ１０で観測することにより、絶縁の良否を判定する。 After the preparation for inspection is completed in this way, a pulse voltage as shown in FIG. 2 is generated from the main body 5a of the pulse voltage generator 5, and the pulse is applied to the winding part 1b via the + terminal 6 and the-terminal 7. Apply voltage. Then, the quality of insulation is determined by observing the voltage change generated in the winding portion 1b by the application of the pulse voltage with the partial discharge detector 8 and the waveform monitor 10.
部分放電検出器８を用いた絶縁性の良否判定は、以下のように行う。図３は、部分放電検出セ器８から出力される波形の例を示す図であり、同図（ａ）は、部分放電の発生が無い場合の波形の一例を、同図（ｂ）は部分放電の発生が有る場合の波形の一例を示している。また、図３（ａ），（ｂ）の上段は、電圧波形＋部分放電波形（全周波数の波形）を、中段は部分放電波形（所定の周波数以上の波形）を、下段は部分放電の周波数スペクトルをそれぞれ示している。 The insulating quality determination using the partial discharge detector 8 is performed as follows. FIG. 3 is a diagram showing an example of a waveform output from the partial discharge detector 8. FIG. 3A shows an example of a waveform when no partial discharge occurs, and FIG. An example of a waveform when discharge occurs is shown. 3 (a) and 3 (b), the upper part shows the voltage waveform + partial discharge waveform (waveform of all frequencies), the middle part shows the partial discharge waveform (waveform above a predetermined frequency), and the lower part shows the frequency of partial discharge. Each spectrum is shown.
部分放電の発生が無い場合、図３（ａ）上段の波形Ｗ１ａに示されるように、部分放電の影響による波形の乱れは生じていない。また、図３（ａ）中段の波形Ｗ２ａには、所定以上の周波数は現れていない。さらに、図３（ａ）下段の波形Ｗ３ａには、部分放電の周波数スペクトルが現れていない。従って、部分放電検出器８において出力される電圧波形＋部分放電波形、部分放電波形、及び部分放電の周波数スペクトルが、それぞれ図３（ａ）上段乃至下段に示される波形形状Ｗ１ａ〜Ｗ３ａと略同一又は近似する場合、部分放電の発生なし（絶縁良好）と判定することができる。 When there is no occurrence of partial discharge, as shown in the upper waveform W1a in FIG. 3A, the waveform is not disturbed due to the influence of partial discharge. In addition, no more than a predetermined frequency appears in the waveform W2a in the middle stage of FIG. Further, the partial discharge frequency spectrum does not appear in the lower waveform W3a of FIG. Accordingly, the voltage waveform output from the partial discharge detector 8 + the partial discharge waveform, the partial discharge waveform, and the frequency spectrum of the partial discharge are substantially the same as the waveform shapes W1a to W3a shown in the upper to lower parts of FIG. Alternatively, when approximate, it can be determined that partial discharge does not occur (insulation is good).
一方、部分放電の発生が有る場合、図３（ｂ）上段の波形Ｗ１ｂに示されるように、部分放電の影響による波形の乱れが生じている。また、図３（ｂ）中段の波形Ｗ２ｂには、所定以上の周波数が現れている。さらに、図３（ｂ）下段の波形Ｗ３ｂには、部分放電の周波数スペクトルが現れている。従って、部分放電検出器８において出力される電圧波形＋部分放電波形、部分放電波形、及び部分放電の周波数スペクトルが、それぞれ図３（ｂ）上段乃至下段に示される波形形状Ｗ１ｂ〜Ｗ３ｂと略同一又は近似する場合、部分放電の発生有り（絶縁不良）と判定することができる。尚、部分放電の発生は、具体的には、部分放電波形（図３（ｂ）参照）の発生頻度や強度によって判定する。 On the other hand, when partial discharge is generated, as shown in the upper waveform W1b in FIG. 3B, the waveform is disturbed due to the partial discharge. Further, in the middle waveform W2b in FIG. 3B, a frequency higher than a predetermined frequency appears. Further, a partial discharge frequency spectrum appears in the lower waveform W3b of FIG. Therefore, the voltage waveform output from the partial discharge detector 8 + the partial discharge waveform, the partial discharge waveform, and the frequency spectrum of the partial discharge are substantially the same as the waveform shapes W1b to W3b shown in the upper to lower parts of FIG. Alternatively, when approximate, it can be determined that partial discharge has occurred (insulation failure). The occurrence of partial discharge is specifically determined by the frequency and intensity of occurrence of the partial discharge waveform (see FIG. 3B).
一方、波形モニタ１０を用いた絶縁性の良否判定は、以下のように行う。まず、絶縁検査に先立って、予め絶縁健全性を確認済みの巻線に図２に示すパルス電圧を印加した時の波形モニタ１０の電圧波形を絶縁判定用のマスタ波形として記録しておく。そして、検査対象の巻線部１ｂにパルス電圧を印加した時の波形モニタ１０の電圧波形を、上述したマスタ波形と比較することにより絶縁の良否を判定する。 On the other hand, the quality of the insulation using the waveform monitor 10 is determined as follows. First, prior to the insulation test, the voltage waveform of the waveform monitor 10 when the pulse voltage shown in FIG. 2 is applied to a winding whose insulation soundness has been confirmed in advance is recorded as a master waveform for insulation determination. And the quality of insulation is determined by comparing the voltage waveform of the waveform monitor 10 when a pulse voltage is applied to the winding part 1b to be inspected with the master waveform described above.
ここで、図４（ａ）は、マスタ波形の一例を示す図であり、同図（ｂ）は、巻線部１ｂにおける電圧波形モニタ１０による電圧波形の二つの例を示す図である。図４（ｂ）において、波形Ｗ４の形状は、図４（ａ）に示すマスタ波形の形状と略同一であるので、巻線部１ｂの絶縁が良好であると判定される。一方、図４（ｂ）における波形Ｗ５の形状は、マスタ波形の形状とは大きく異なり、僅かな電圧変化しか生じていないことから、巻線部１ｂにおいて絶縁不良（巻線レアショート）が発生していると判定される。 Here, FIG. 4A is a diagram showing an example of the master waveform, and FIG. 4B is a diagram showing two examples of voltage waveforms by the voltage waveform monitor 10 in the winding portion 1b. In FIG. 4B, since the shape of the waveform W4 is substantially the same as the shape of the master waveform shown in FIG. 4A, it is determined that the insulation of the winding portion 1b is good. On the other hand, the shape of the waveform W5 in FIG. 4B is significantly different from the shape of the master waveform, and only a slight voltage change has occurred, so that an insulation failure (winding rare short) occurs in the winding portion 1b. It is determined that
次に、本実施形態の絶縁検査方法の効果について、従来の絶縁検査方法である比較例と対比しつつ説明する。 Next, the effect of the insulation inspection method of this embodiment will be described in comparison with a comparative example that is a conventional insulation inspection method.
まず、比較例の絶縁検査方法について、本実施形態の絶縁検査方法と異なる点を説明する。図５は、従来技術である比較例の固定子巻線の絶縁検査方法を説明するための回路図である。尚、図５における各符号は上述した本実施形態と共通である。 First, the insulation inspection method of the comparative example will be described while referring to differences from the insulation inspection method of the present embodiment. FIG. 5 is a circuit diagram for explaining a stator winding insulation inspection method according to a comparative example, which is a conventional technique. In addition, each code | symbol in FIG. 5 is common in this embodiment mentioned above.
比較例では、図５に示すように、固定子巻線１の巻線部１ｂについて絶縁検査を行う場合、巻き始め端２にパルス電圧発生装置５の＋端子６を接続し、巻き終り端３に−端子７を接続して、巻き始め端２から巻き終り端３まで固定子巻線１全体にパルス電圧を印加する。部分放電検出器８や波形モニタ１０を用いた絶縁性の良否判定方法は上述した本実施形態と同様である。 In the comparative example, as shown in FIG. 5, when an insulation test is performed on the winding portion 1 b of the stator winding 1, the positive terminal 6 of the pulse voltage generator 5 is connected to the winding start end 2 and the winding end 3 -A terminal 7 is connected to apply a pulse voltage to the entire stator winding 1 from the winding start end 2 to the winding end end 3. The insulation quality determination method using the partial discharge detector 8 and the waveform monitor 10 is the same as that of the present embodiment described above.
ここで、図６は、固定子巻線１の巻線位置によるパルス波形のピーク値変化を示す図であり、同図（ａ）は比較例を、同図（ｂ）は本実施形態をそれぞれ示している。比較例では、巻き始め端２より離れた巻線部１ｂを検査する目的で、巻き始め端２と巻き終り端３とから巻線部１ｂに所定の電位差ΔＶ１を印加すると、巻き始め端２付近に電位が集中して分布することにより、巻き始め端２に近い他の巻線部１ａの電位差ΔＶ２が大きくなる。このため、巻線部１ａにおいて過大な電圧に起因する部分放電（図３（ｂ）参照）が発生する可能性が高く、部分放電の有無から巻線部１ｂの絶縁健全性を確認することができないという問題がある。また、巻線部１ａに過大な電圧が加わるため、絶縁破壊を引き起こす可能性がある。 Here, FIG. 6 is a diagram showing changes in the peak value of the pulse waveform depending on the winding position of the stator winding 1, wherein FIG. 6A shows a comparative example, and FIG. 6B shows this embodiment. Show. In the comparative example, when a predetermined potential difference ΔV1 is applied to the winding portion 1b from the winding start end 2 and the winding end end 3 for the purpose of inspecting the winding portion 1b far from the winding start end 2, the vicinity of the winding start end 2 is obtained. The potential difference ΔV2 of the other winding part 1a close to the winding start end 2 becomes large because the potential is concentrated and distributed on the winding start end 2. For this reason, there is a high possibility that partial discharge (see FIG. 3B) due to excessive voltage occurs in the winding part 1a, and it is possible to confirm the insulation soundness of the winding part 1b from the presence or absence of partial discharge. There is a problem that you can not. Moreover, since an excessive voltage is applied to the winding part 1a, there is a possibility of causing dielectric breakdown.
これに対し、本実施形態では、巻線部１ｂの一方側の導体露出部４と他方側の導体露出部４とからパルス電圧を印加するので、図６（ｂ）に示すように、固定子巻線１に分布する電圧によって巻線部１ｂには所定の電位差ΔＶ１が発生するが、巻線部１ａには電位差がほとんど発生しない。従って、本実施形態によれば、巻線部１ａにおいて部分放電が発生したり、巻線部１ａに過大な電圧が加わって絶縁破壊を引き起こすことがない。 On the other hand, in this embodiment, since the pulse voltage is applied from the conductor exposed portion 4 on one side and the conductor exposed portion 4 on the other side of the winding portion 1b, as shown in FIG. Although a predetermined potential difference ΔV1 is generated in the winding portion 1b by the voltage distributed in the winding 1, almost no potential difference is generated in the winding portion 1a. Therefore, according to the present embodiment, a partial discharge does not occur in the winding part 1a, and an excessive voltage is applied to the winding part 1a, thereby preventing dielectric breakdown.
以上詳述したことから明らかなように、本実施形態によれば、パルス電圧発生装置５の＋端子６を固定子巻線１の巻き始め端２と巻き終り端３との間に設けられた一の導体露出部４（巻線部１ｂの一端側）に接続し、−端子７を固定子巻線１の他の導体露出部４（巻線部１ｂの他端側）に接続してパルス電圧を印加するので、固定子巻線１の目的部位（巻線部１ｂ）に所定のパルス電圧を印加することができ、且つ目的部位以外（巻線部１ａ）において過大な電圧の印加による部分放電の発生を防止して、目的部位（巻線部１ｂ）の絶縁健全性を確実に検査することができる。 As is clear from the above detailed description, according to the present embodiment, the positive terminal 6 of the pulse voltage generator 5 is provided between the winding start end 2 and the winding end end 3 of the stator winding 1. Connected to one conductor exposed portion 4 (one end side of the winding portion 1b) and connected to the other conductor exposed portion 4 (the other end side of the winding portion 1b) of the stator winding 1 to pulse. Since a voltage is applied, a predetermined pulse voltage can be applied to the target portion (winding portion 1b) of the stator winding 1, and a portion by applying an excessive voltage at a portion other than the target portion (winding portion 1a). Generation | occurrence | production of discharge can be prevented and the insulation soundness of the target part (winding part 1b) can be test | inspected reliably.
次に、本発明を車両用交流発電機における固定子巻線の絶縁検査に適用した各実施例について説明する。まず、車両用交流発電機の固定子２０の構成について図面を参照しつつ説明する。図７（ａ）は、固定子２０全体の外観を示す斜視図であり、同図（ｂ）は、（ａ）において一点鎖線で囲まれた領域（固定子巻線２３のエンド部２３ａの一部）を拡大して示す図である。図８は、図７に示す固定子巻線２３の結線図である。 Next, each Example which applied this invention to the insulation test | inspection of the stator winding | coil in the alternating current generator for vehicles is demonstrated. First, the configuration of the stator 20 of the vehicle alternator will be described with reference to the drawings. FIG. 7A is a perspective view showing the external appearance of the entire stator 20, and FIG. 7B is a diagram (one portion of the end portion 23 a of the stator winding 23) surrounded by an alternate long and short dash line in FIG. FIG. FIG. 8 is a connection diagram of the stator winding 23 shown in FIG.
固定子２０は、固定子鉄心２２と、固定子鉄心２２に装備された固定子巻線２３とを含んで構成されている。固定子鉄心２２は、薄い鋼板を重ね合わせて構成されており、円環形状の内周側に複数個（本実施形態では７２個）のスロット２５が形成されている。固定子巻線２３は、Ｕ相巻線、Ｖ相巻線、及びＷ相巻線から三相巻線を形成するものであり、固定子鉄心２２に形成された７２個のスロット２５に収納されている。固定子巻線２３は、複数の略Ｕ字状又は略Ｖ字状の導体セグメントを径方向に沿って配列し、固定子鉄心２２の軸方向両端面から突出する複数の導体セグメントの導体が露出する端部同士を互いに溶接やボルト接続等で接合して複数の接続部２３ｂを形成することによりエンド部２３ａを構成する。各導体セグメントは、端部の導体を露出させた状態で各接続部２３ｂを形成した後、絶縁処理（カバー）が施される。尚、接続部２３ｂが、本発明の導体露出部（上記実施形態の導体露出部４）を構成するものである。 The stator 20 is configured to include a stator core 22 and a stator winding 23 provided on the stator core 22. The stator core 22 is configured by stacking thin steel plates, and a plurality (72 in this embodiment) of slots 25 are formed on the inner peripheral side of the annular shape. The stator winding 23 forms a three-phase winding from a U-phase winding, a V-phase winding, and a W-phase winding, and is housed in 72 slots 25 formed in the stator core 22. ing. The stator winding 23 has a plurality of substantially U-shaped or substantially V-shaped conductor segments arranged in the radial direction, and the conductors of the plurality of conductor segments protruding from both axial end surfaces of the stator core 22 are exposed. The end portions 23a are configured by joining end portions to be joined together by welding, bolt connection, or the like to form a plurality of connection portions 23b. Each conductor segment is subjected to insulation treatment (covering) after forming each connection portion 23b with the end conductor exposed. In addition, the connection part 23b comprises the conductor exposed part (conductor exposed part 4 of the said embodiment) of this invention.
次に、第１実施例の絶縁検査方法について説明する。第１実施例は、固定子鉄心２２の同一スロット２５内で隣接配置された巻線部間の絶縁健全性を検査する方法である。尚、以下の説明では、固定子巻線２３（三相巻線）のうち特にＵ相巻線の絶縁検査方法について述べる（固定子巻線２３をＵ相巻線２３と称する。）。図９は、第１実施例におけるパルス電圧の印加方法を示す固定子巻線２３の結線図である。図１０は、Ｕ相巻線２３を示す回路図である。図１１は、固定子鉄心２２のスロット２５内におけるＵ相巻線２３の配置例を示す断面図である。 Next, the insulation inspection method of the first embodiment will be described. The first embodiment is a method for inspecting the insulation soundness between winding portions arranged adjacent to each other in the same slot 25 of the stator core 22. In the following description, an insulation inspection method for the U-phase winding among the stator windings 23 (three-phase windings) will be described (the stator winding 23 will be referred to as the U-phase winding 23). FIG. 9 is a connection diagram of the stator winding 23 showing a method of applying a pulse voltage in the first embodiment. FIG. 10 is a circuit diagram showing the U-phase winding 23. FIG. 11 is a cross-sectional view showing an arrangement example of the U-phase winding 23 in the slot 25 of the stator core 22.
Ｕ相巻線２３は、図９，図１０に示すように、６個の巻線部、すなわち、第１巻線部Ｕ１，第２巻線部Ｕ２，第３巻線部Ｕ３，第４巻線部Ｕ４，第５巻線部Ｕ５，及び第６巻線部Ｕ６から構成される。また、各巻線部Ｕ１〜Ｕ６は、それぞれ４個の接続部を有している。例えば、第１巻線部Ｕ１には、第１接続部Ｕ１−１，第２接続部Ｕ１−２，第３接続部Ｕ１−３，及び第４接続部Ｕ１−４を備えている。 As shown in FIGS. 9 and 10, the U-phase winding 23 has six winding portions, that is, a first winding portion U1, a second winding portion U2, a third winding portion U3, a fourth winding. It is composed of a wire portion U4, a fifth winding portion U5, and a sixth winding portion U6. Moreover, each winding part U1-U6 has four connection parts, respectively. For example, the first winding portion U1 includes a first connection portion U1-1, a second connection portion U1-2, a third connection portion U1-3, and a fourth connection portion U1-4.
また、Ｕ相巻線２３の各巻線部Ｕ１〜Ｕ６は、図１１に示すように、固定子鉄心２２のスロット２５内に配置されている。すなわち、第１巻線部Ｕ１と第４巻線部Ｕ４とは、同一スロット２５内で隣接して交互に配置されている。同様に、第２巻線部Ｕ２と第５巻線部Ｕ５、及び第３巻線部Ｕ３と第６巻線部Ｕ６とは、それぞれ同一スロット２５内で隣接して交互に配置されている。また、第１巻線部Ｕ１と第４巻線部Ｕ４とが配置されるスロット２５、第２巻線部Ｕ２と第５巻線部Ｕ５とが配置されるスロット２５、及び第３巻線部Ｕ３と第６巻線部Ｕ６とが配置されるスロット２５は、互いに電気角位相が異なっている。また、Ｕ相巻線２３の導体部外周には絶縁被覆２３ｃが施され、Ｕ相巻線２３とスロット２５を形成する固定子鉄心２２壁面との間には絶縁紙２６が介挿されている。 Moreover, each coil | winding part U1-U6 of the U-phase coil | winding 23 is arrange | positioned in the slot 25 of the stator core 22, as shown in FIG. That is, the first winding portion U1 and the fourth winding portion U4 are alternately arranged adjacent to each other in the same slot 25. Similarly, the second winding portion U2 and the fifth winding portion U5, and the third winding portion U3 and the sixth winding portion U6 are alternately arranged adjacent to each other in the same slot 25. Further, the slot 25 in which the first winding portion U1 and the fourth winding portion U4 are disposed, the slot 25 in which the second winding portion U2 and the fifth winding portion U5 are disposed, and the third winding portion. The slots 25 in which U3 and the sixth winding part U6 are arranged have different electrical angle phases. Further, an insulation coating 23c is applied to the outer periphery of the conductor portion of the U-phase winding 23, and an insulating paper 26 is interposed between the U-phase winding 23 and the wall surface of the stator core 22 forming the slot 25. .
次に、固定子鉄心２２の同一スロット２５内で隣接配置される第１巻線部Ｕ１と第４巻線部Ｕ４との間の絶縁検査方法について説明する。図１２は、第１実施例におけるＵ相巻線２３の回路図及び各接続部２３ｂでの電位分布を示す図である。本実施例では、図９に示すように、第１巻線部Ｕ１の第１接続部Ｕ１−１〜第４接続部Ｕ１−４の４箇所にパルス電圧発生装置５の＋端子６をそれぞれ接続し、第４巻線部Ｕ４の第１接続部Ｕ４−１〜Ｕ４−４に−端子７を４箇所接続する。パルス電圧発生装置５においてパルス電圧を発生させることにより、図１２に示すように、第１巻線部Ｕ１〜第４巻線部Ｕ４間に所定の電圧Ｖ１１を印加することが出来る。このとき、図１２に示すように、他のスロット２５内の第２巻線部Ｕ２〜第５巻線部Ｕ５間、第３巻線部Ｕ３〜第６巻線部Ｕ６間にもそれぞれ電圧Ｖ１２及び電圧Ｖ１３が加わることになるが、図１２の電位分布が示すように、電圧Ｖ１２及びＶ１３は電圧Ｖ１１よりも低くなる。 Next, an insulation inspection method between the first winding portion U1 and the fourth winding portion U4 that are adjacently disposed in the same slot 25 of the stator core 22 will be described. FIG. 12 is a circuit diagram of the U-phase winding 23 and a potential distribution at each connection portion 23b in the first embodiment. In the present embodiment, as shown in FIG. 9, the positive terminal 6 of the pulse voltage generator 5 is connected to each of four locations of the first connection portion U1-1 to the fourth connection portion U1-4 of the first winding portion U1. Then, four negative terminals 7 are connected to the first connection portions U4-1 to U4-4 of the fourth winding portion U4. By generating a pulse voltage in the pulse voltage generator 5, a predetermined voltage V11 can be applied between the first winding portion U1 and the fourth winding portion U4 as shown in FIG. At this time, as shown in FIG. 12, the voltage V12 is also applied between the second winding part U2 to the fifth winding part U5 in the other slot 25 and between the third winding part U3 to the sixth winding part U6. And the voltage V13 are applied, but the voltages V12 and V13 are lower than the voltage V11 as shown in the potential distribution of FIG.
以上により、第１巻線部Ｕ１〜第４巻線部Ｕ４間には最も大きな電圧（ストレス）を印加することができるため、第２巻線部Ｕ２〜第５巻線部Ｕ５間や第３巻線部Ｕ３〜第６巻線部Ｕ６間の部分放電発生を抑制し、目的とする第１巻線部Ｕ１〜第４巻線部Ｕ４間の絶縁状態を部分放電検出器８を用いて検査することができる。また、パルス電圧波形２３の波形変化を波形モニタ１０で観測し、第１巻線部Ｕ１〜第４巻線部Ｕ４間のレアショートを検出することもできる。 As described above, since the largest voltage (stress) can be applied between the first winding portion U1 to the fourth winding portion U4, the second winding portion U2 to the fifth winding portion U5 or the third winding portion U5 can be applied. The partial discharge generation between the winding part U3 and the sixth winding part U6 is suppressed, and the intended insulation state between the first winding part U1 and the fourth winding part U4 is inspected using the partial discharge detector 8. can do. Moreover, the waveform change of the pulse voltage waveform 23 is observed with the waveform monitor 10, and the rare short-circuit between the 1st winding part U1-the 4th winding part U4 can also be detected.
以上詳述したことから明らかなように、本実施例によれば、パルス電圧発生装置５の＋端子６及び−端子７の一方を、固定子鉄心２２の軸方向両端面から突出する複数の導体セグメントの端部同士を互いに接合してなる複数の接続部２３ｂのいずれかに接続し、他方を固定子巻線２３の他の接続部２３ｂに接続してパルス電圧を印加するので、固定子巻線２３の目的部位（巻線部Ｕ１〜Ｕ４間）に所定のパルス電圧を印加することができ、且つ目的部位以外において過大な電圧の印加による部分放電の発生を防止して、目的部位（巻線部Ｕ１〜Ｕ４間）の絶縁健全性を確実に検査することができる。 As is clear from the above detailed description, according to the present embodiment, one of the positive terminal 6 and the negative terminal 7 of the pulse voltage generator 5 is provided with a plurality of conductors protruding from both axial end surfaces of the stator core 22. Since the end portions of the segments are connected to one of a plurality of connecting portions 23b formed by joining each other and the other end is connected to the other connecting portion 23b of the stator winding 23, a pulse voltage is applied. A predetermined pulse voltage can be applied to the target portion of the wire 23 (between the winding portions U1 to U4), and the occurrence of partial discharge due to the application of an excessive voltage other than the target portion can be prevented. The insulation soundness between the line portions U1 to U4) can be reliably inspected.
また、固定子鉄心２２の同一スロット２５内で互いに隣接して配置される同相の一方の巻線部（第１巻線部Ｕ１）と他方の巻線部（第４巻線部Ｕ４）との間の絶縁健全性を検査する場合、パルス電圧発生装置１の＋端子６を一方の巻線部（第１巻線部Ｕ１）を構成する複数の導体セグメントのすべての接続部２３ｂに接続すると共に、−端子７を他方の巻線部（第４巻線部Ｕ４）を構成する複数の導体セグメントのすべての接続部２３ｂに接続してパルス電圧を印加する。よって、固定子巻線２３の目的部位である固定子鉄心２２の同一スロット２５内で互いに隣接して配置される同相の一方の巻線部（第１巻線部Ｕ１）と他方の巻線部（第４巻線部Ｕ４）との間に電圧低下を伴うことなく所定のパルス電圧を印加することができ、且つ目的部位以外において過大な電圧の印加による部分放電の発生を防止して、目的部位の絶縁健全性を確実に検査することができる。 Further, one winding portion (first winding portion U1) in phase and the other winding portion (fourth winding portion U4) disposed adjacent to each other in the same slot 25 of the stator core 22 When inspecting the insulation soundness between the terminals, the positive terminal 6 of the pulse voltage generator 1 is connected to all the connection parts 23b of the plurality of conductor segments constituting one winding part (first winding part U1). The terminal 7 is connected to all the connection parts 23b of the plurality of conductor segments constituting the other winding part (fourth winding part U4), and a pulse voltage is applied. Therefore, one in-phase winding portion (first winding portion U1) and the other winding portion that are arranged adjacent to each other in the same slot 25 of the stator core 22 that is the target portion of the stator winding 23 A predetermined pulse voltage can be applied to the (fourth winding portion U4) without causing a voltage drop, and the occurrence of partial discharge due to application of an excessive voltage other than the target portion can be prevented. It is possible to reliably inspect the insulation soundness of the part.
次に、第２実施例の絶縁検査方法について説明する。第２実施例は、エンド部２３ａにおける巻線部間の絶縁健全性を検査する方法である。図１３（ａ）は、第２実施例における絶縁検査の対象箇所を示す固定子２０の斜視図、同図（ｂ）は一方側（導体セグメント屈曲部側）のエンド部２３ａの拡大図、同図（ｃ）は他方側（接続部２３ｂ側）のエンド部２３ａの拡大図である。図１４（ａ）は、図１３（ｂ）におけるＡ方向断面図、同図（ｂ）は図１３（ｃ）におけるＢ方向断面図である。図１５は、第２実施例におけるパルス電圧の印加方法を示す固定子巻線２３の結線図である。図１６は、第２実施例におけるＵ相巻線２３の回路図及び各接続部２３ｂでの電位分布を示す図である。 Next, an insulation inspection method according to the second embodiment will be described. The second embodiment is a method for inspecting the insulation soundness between the winding portions in the end portion 23a. FIG. 13A is a perspective view of the stator 20 showing a target location for insulation inspection in the second embodiment, and FIG. 13B is an enlarged view of the end portion 23a on one side (conductor segment bent portion side). FIG. 7C is an enlarged view of the end portion 23a on the other side (connection portion 23b side). 14A is a cross-sectional view in the A direction in FIG. 13B, and FIG. 14B is a cross-sectional view in the B direction in FIG. 13C. FIG. 15 is a connection diagram of the stator winding 23 showing a method of applying a pulse voltage in the second embodiment. FIG. 16 is a circuit diagram of the U-phase winding 23 and a potential distribution at each connection portion 23b in the second embodiment.
ここで、一般に巻線のエンド部２３ａでは異相巻線同士が隣接して配置されるため、スロット２５内の同相同士の巻線間Ｐに比べて巻線間の電位差が大きく、部分放電開始電圧も高くなるように絶縁補強されている。エンド部２３ａには異相の巻線間と同相の巻線間が存在するが、導体セグメントで巻線を構成する場合には、製造の容易性の観点からは異相間と同相間の絶縁を同一設計とすることが好ましい。スロット２５内では巻線２３同士が接触して配置されるのに対して（図１１参照）、エンド部２３ａでは巻線部間ＱやＲにそれぞれギャップや絶縁紙２６を介挿する（図１４（ａ），（ｂ）参照）。そのため、部分放電開始電圧は、エンド部２３ａの巻線部間Ｑ，Ｒの方がスロット２５内の巻線部間Ｐよりも高くなる。従って、従来技術のようにＵ相巻線２３の巻き始め端巻き終り端の間に電圧を印加すると、部分放電開始電圧が低いスロット２５内の巻線部間Ｐにも電位差が発生し、スロット２５内で部分放電等を引き起こすため、エンド部２３ａの部分放電のみを正確に検出することができなかった。 Here, since the different-phase windings are generally arranged adjacent to each other at the winding end portion 23a, the potential difference between the windings is larger than that between the same-phase windings P in the slot 25, and partial discharge starts. The insulation is reinforced to increase the voltage. In the end portion 23a, between the windings of different phases and between the windings of the same phase exist. However, when the windings are constituted by the conductor segments, the insulation between the different phases and the same phase is the same from the viewpoint of ease of manufacturing. A design is preferred. In the slot 25, the windings 23 are arranged in contact with each other (see FIG. 11), whereas in the end portion 23a, gaps and insulating paper 26 are inserted between the winding portions Q and R, respectively (FIG. 14). (See (a) and (b)). Therefore, the partial discharge start voltage is higher between the winding portions Q and R of the end portion 23a than between the winding portions P in the slot 25. Accordingly, when a voltage is applied between the winding start end and winding end of the U-phase winding 23 as in the prior art, a potential difference is also generated between the winding portions P in the slot 25 where the partial discharge starting voltage is low, and the slot In this case, partial discharge or the like is caused in 25, so that only partial discharge of the end portion 23a cannot be accurately detected.
本実施例では、図１５に示すように、エンド部２３ａにおける第１巻線部Ｕ１の第１接続部Ｕ１−１に＋端子６を、第２巻線部Ｕ２の第１接続部Ｕ２−１に−端子７をそれぞれ接続し、接続部Ｕ１−１とＵ２−１との間にパルス電圧波形を印加する。それと同時に、スロット２５内の巻線部間（接続部Ｕ１−１とＵ４−１間、接続部Ｕ２−１とＵ５−１間）に電位差を与えないように、第４巻線部Ｕ４の第１接続部Ｕ４−１には＋端子６を接続してＵ１−１と同電位（極性）とし、且つ第５巻線部Ｕ５の第１接続部Ｕ５−１には−端子７を接続してＵ２−１と同電位（極性）とする。 In the present embodiment, as shown in FIG. 15, a positive terminal 6 is connected to the first connection portion U1-1 of the first winding portion U1 in the end portion 23a, and a first connection portion U2-1 of the second winding portion U2. -Terminals 7 are connected to each other, and a pulse voltage waveform is applied between the connecting portions U1-1 and U2-1. At the same time, the fourth winding portion U4 has a fourth winding portion U4 so as not to cause a potential difference between the winding portions in the slot 25 (between the connection portions U1-1 and U4-1 and between the connection portions U2-1 and U5-1). The + terminal 6 is connected to the 1 connection part U4-1 to have the same potential (polarity) as the U1-1, and the-terminal 7 is connected to the first connection part U5-1 of the fifth winding part U5. The same potential (polarity) as U2-1.
このようにして、図１６に示すように、エンド部２３ａの接続部Ｕ１−１とＵ２−１との間、接続部Ｕ４−１とＵ５−１との間に、スロット２５内で部分放電を発生させることなく所定の電圧Ｖ２１を印加して、目的とする第１巻線部Ｕ１〜第２巻線部Ｕ２間及び第４巻線部Ｕ４〜第５巻線部Ｕ５間の絶縁状態を部分放電検出器８を用いて検査することができる。また、パルス電圧波形の波形変化を波形モニタ１０で観測し、第１巻線部Ｕ１〜第２巻線部Ｕ２間及び第４巻線部Ｕ４〜第５巻線部Ｕ５間のレアショートを検出することもできる。 In this way, as shown in FIG. 16, a partial discharge is generated in the slot 25 between the connection portions U1-1 and U2-1 of the end portion 23a and between the connection portions U4-1 and U5-1. Applying a predetermined voltage V21 without generating a partial insulation state between the first winding part U1 and the second winding part U2 and between the fourth winding part U4 and the fifth winding part U5 Inspection can be performed using the discharge detector 8. In addition, the waveform change of the pulse voltage waveform is observed with the waveform monitor 10 to detect rare shorts between the first winding part U1 and the second winding part U2 and between the fourth winding part U4 and the fifth winding part U5. You can also
以上詳述したことから明らかなように、本実施例によれば、エンド部２３ａで互いに隣接して配置される異相の一方の巻線部（第１巻線部Ｕ１）と他方の巻線部（第２巻線部Ｕ２）との間の絶縁健全性を検査する場合、パルス電圧発生装置５の＋端子を一方の巻線部（第１巻線部Ｕ１）を構成する導体セグメントの接続部２３ｂ（Ｕ１−１）及び一方の巻線部（第１巻線部Ｕ１）と固定子鉄心２２の同一スロット２５内で互いに隣接して配置される同相の巻線部（第４巻線部Ｕ４）の接続部２３ｂ（Ｕ４−１）に接続すると共に、−端子７を他方の巻線部（第２巻線部Ｕ２）を構成する導体セグメントの接続部２３ｂ（Ｕ２−１）及び他方の巻線部（第２巻線部Ｕ２）と固定子鉄心２２の同一スロット２５内で互いに隣接して配置される同相の巻線部（第５巻線部Ｕ５）の接続部２３ｂ（Ｕ５−１）に接続してパルス電圧を印加する。よって、固定子巻線２３の目的部位であるエンド部２３ａで互いに隣接して配置される異相の一方の巻線部（例えば第１巻線部Ｕ１）と他方の巻線部（例えば第２巻線部Ｕ２）との間に所定のパルス電圧を印加することができ、且つ目的部位以外である同一スロット２５内で互いに隣接して配置される同相の巻線部（Ｕ１とＵ４、Ｕ２とＵ５）間で過大な電圧の印加による部分放電の発生を防止して、目的部位の絶縁健全性を確実に検査することができる。 As is clear from the above detailed description, according to the present embodiment, one end of the winding portion (first winding portion U1) and the other winding portion disposed adjacent to each other at the end portion 23a. When inspecting the insulation soundness with the (second winding part U2), the positive terminal of the pulse voltage generator 5 is connected to the conductor segment constituting one winding part (first winding part U1). 23b (U1-1) and one winding part (first winding part U1) and the same-phase winding part (fourth winding part U4) arranged adjacent to each other in the same slot 25 of the stator core 22. ) Of the conductor segment that constitutes the other winding part (second winding part U2) and the other winding. In-phase arranged adjacent to each other in the same slot 25 of the wire portion (second winding portion U2) and the stator core 22. Connected to the winding unit (5 winding part U5) of the connecting portion 23b (U5-1) applies a pulse voltage. Therefore, one end of the stator winding 23, which is the target portion of the end portion 23a, is disposed adjacent to each other (for example, the first winding portion U1) and the other winding portion (for example, the second winding). A predetermined pulse voltage can be applied to the line portion U2), and in-phase winding portions (U1 and U4, U2 and U5) disposed adjacent to each other in the same slot 25 other than the target portion. ) Can prevent partial discharge due to application of an excessive voltage, and reliably inspect the insulation soundness of the target portion.
そして、本発明によれば、従来では困難であった同相の固定子巻線内の各部位の絶縁健全性を確認することができ、これにより信頼性の高い回転電機を提供することが可能となる。 And according to the present invention, it is possible to confirm the insulation soundness of each part in the stator winding of the same phase, which has been difficult in the past, and thereby to provide a highly reliable rotating electrical machine. Become.
尚、本発明は上述した実施の形態に限定されるものではなく、本発明の主旨を逸脱しない範囲で種々の変更を施すことが可能であることは云うまでもない。 Needless to say, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
例えば、前記実施形態では、＋端子６を固定子巻線１の一の導体露出部４に接続し、−端子７を他の導体露出部４に接続してパルス電圧を印加したが、＋端子６及び−端子７の一方を固定子巻線１の一の導体露出部４に接続し、他方を固定子巻線１の巻き始め端２又は巻き終り端３に接続してパルス電圧を印加するようにしてもよい。 For example, in the above-described embodiment, the + terminal 6 is connected to one conductor exposed portion 4 of the stator winding 1, the − terminal 7 is connected to another conductor exposed portion 4, and the pulse voltage is applied. One of the 6 and − terminals 7 is connected to one conductor exposed portion 4 of the stator winding 1, and the other is connected to the winding start end 2 or winding end end 3 of the stator winding 1 to apply a pulse voltage. You may do it.
また、前記各実施例では、Ｕ相巻線の各部位の絶縁健全性を検査する場合を例として説明したが、Ｖ相やＷ相の巻線についても同様の方法で絶縁健全性を検査することが可能である。 In each of the above-described embodiments, the case where the insulation soundness of each part of the U-phase winding is inspected is described as an example. However, the insulation soundness is also examined for the V-phase and W-phase windings by the same method. It is possible.
本発明は、回転電機における固定子巻線の絶縁検査において巻線内の目的部位以外での過大な電圧による部分放電の発生を防止して目的部位の絶縁健全性を確実に検査することが必要な場合に利用可能である。 The present invention requires that the insulation soundness of the target part be reliably checked by preventing the occurrence of partial discharge due to an excessive voltage other than the target part in the winding in the insulation inspection of the stator winding in the rotating electrical machine. It can be used in any case.
１ 固定子巻線
２ 巻き始め端
３ 巻き終り端
４ 導体露出部
５ パルス電圧発生装置
６ ＋端子（高電位側端子）
７ −端子（低電位側端子）
８ 部分放電検出器
１０ 電圧波形モニタ
２０ 固定子
２２ 固定子鉄心
２３ 固定子巻線
２３ａ エンド部
２３ｂ 接続部
２５ スロット
Ｕ１，Ｕ２，Ｕ３，Ｕ４，Ｕ５，Ｕ６ 巻線部
Ｕ１−１…Ｕ１−４，Ｕ２−１…Ｕ２−４，Ｕ３−１…Ｕ３−４，Ｕ４−１…Ｕ４−４，Ｕ５−１…Ｕ５−４，Ｕ６−１…Ｕ６−４ 接続部（導体露出部）
1 Stator Winding 2 Winding End 3 Winding End 4 Conductor Exposed Part 5 Pulse Voltage Generator 6 + Terminal (High Potential Side Terminal)
7-terminal (low potential side terminal)
8 Partial Discharge Detector 10 Voltage Waveform Monitor 20 Stator 22 Stator Core 23 Stator Winding 23a End Portion 23b Connection Portion 25 Slot U1, U2, U3, U4, U5, U6 Winding Portion U1-1 ... U1-4 , U2-1 ... U2-4, U3-1 ... U3-4, U4-1 ... U4-4, U5-1 ... U5-4, U6-1 ... U6-4 Connection part (conductor exposed part)
Claims (4)
前記固定子巻線は、巻き始め端と巻き終り端との間に少なくとも一つの導体露出部を有するものであり、
前記パルス電圧発生装置の前記高電位側端子及び前記低電位側端子の一方を前記固定子巻線の前記導体露出部に接続し、他方を前記固定子巻線の他の前記導体露出部、前記巻き始め端、又は前記巻き終り端に接続して前記パルス電圧を印加することを特徴とする回転電機における固定子巻線の絶縁検査方法。 A method for inspecting insulation of a stator winding mounted on a stator core of a rotating electrical machine, wherein a high potential side terminal and a low potential side terminal of a pulse voltage generator are connected to different portions of the stator winding, respectively. In the method of inspecting the insulation of the stator winding in the rotating electrical machine, applying a pulse voltage and observing the voltage change generated in the stator winding to determine the quality of the insulation,
The stator winding has at least one conductor exposed portion between a winding start end and a winding end end,
One of the high potential side terminal and the low potential side terminal of the pulse voltage generator is connected to the conductor exposed portion of the stator winding, and the other is connected to the other conductor exposed portion of the stator winding, A method for inspecting insulation of a stator winding in a rotating electrical machine, wherein the pulse voltage is applied by connecting to a winding start end or a winding end end.
前記導体露出部は、前記複数の接続部であることを特徴とする請求項１に記載の回転電機における固定子巻線の絶縁検査方法。 The stator winding has a plurality of substantially U-shaped or substantially V-shaped conductor segments arranged in a radial direction in a slot formed in the stator core, and both axial end surfaces of the stator core. The end portions of the plurality of conductor segments projecting from each other are joined together to form an end portion having a plurality of connection portions,
The method of claim 1, wherein the conductor exposed portions are the plurality of connection portions.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2011012999A (en) * | 2009-06-30 | 2011-01-20 | Toshiba Corp | Methods for testing and manufacturing rotary electric machine |
| CN109917284A (en) * | 2019-01-31 | 2019-06-21 | 贵州凯峰科技有限责任公司 | A kind of miniature cocurrent electromotor positive and negative rotation circuit digital detecting system and its test method |
| WO2021029104A1 (en) * | 2019-08-09 | 2021-02-18 | 株式会社日立製作所 | Rotating electric machine diagnosis system and diagnosis method |
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| JP2004361415A (en) * | 1994-06-17 | 2004-12-24 | Matsushita Electric Ind Co Ltd | Method and system for non-destructive insulation testing of small electrical machine |
| JP2005069745A (en) * | 2003-08-21 | 2005-03-17 | Toyota Motor Corp | Method and apparatus for locating insulation failure of stator |
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| JPS5469701A (en) * | 1977-11-15 | 1979-06-05 | Hitachi Ltd | Insulation deterioration detecting device for rotary electric machine coil |
| JPS5759177A (en) * | 1980-09-26 | 1982-04-09 | Mitsubishi Electric Corp | Method for diagosing insulation of revolving electric machine |
| JP2004361415A (en) * | 1994-06-17 | 2004-12-24 | Matsushita Electric Ind Co Ltd | Method and system for non-destructive insulation testing of small electrical machine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011012999A (en) * | 2009-06-30 | 2011-01-20 | Toshiba Corp | Methods for testing and manufacturing rotary electric machine |
| CN109917284A (en) * | 2019-01-31 | 2019-06-21 | 贵州凯峰科技有限责任公司 | A kind of miniature cocurrent electromotor positive and negative rotation circuit digital detecting system and its test method |
| WO2021029104A1 (en) * | 2019-08-09 | 2021-02-18 | 株式会社日立製作所 | Rotating electric machine diagnosis system and diagnosis method |
| JP2021028591A (en) * | 2019-08-09 | 2021-02-25 | 株式会社日立製作所 | Diagnostic system and diagnostic method for rotary electric machine |
| JP7217682B2 (en) | 2019-08-09 | 2023-02-03 | 株式会社日立製作所 | Diagnosis system and method for rotary electric machine |
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