JP2013105566A - Flat insulated wire - Google Patents
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- JP2013105566A JP2013105566A JP2011247352A JP2011247352A JP2013105566A JP 2013105566 A JP2013105566 A JP 2013105566A JP 2011247352 A JP2011247352 A JP 2011247352A JP 2011247352 A JP2011247352 A JP 2011247352A JP 2013105566 A JP2013105566 A JP 2013105566A
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本発明は、平角導体の外周に樹脂からなる絶縁皮膜を形成した平角絶縁電線に係り、特に、モータなどの電気機器のコイル等に用いられる巻線用の平角絶縁電線に関するものである。 The present invention relates to a rectangular insulated wire in which an insulating film made of resin is formed on the outer periphery of a rectangular conductor, and more particularly to a rectangular insulated wire for winding used in a coil of an electric device such as a motor.
モータなどの電気機器には、導体上に絶縁塗料を塗布し、焼付けして形成された絶縁皮膜を備えた絶縁電線が使用されており、特にコイル等の巻線用には、平角導体の外周に少なくとも１層の絶縁皮膜を形成した平角絶縁電線が一般に使用されている。 Electrical equipment such as motors uses insulated wires with an insulating coating formed by applying insulating paint on the conductor and baking it. Especially for windings such as coils, the outer circumference of a flat conductor In general, a rectangular insulated wire having at least one insulating film formed thereon is used.
近年、電気機器の高出力化のために、高電圧でのインバータ制御が行われており、これに伴い、過大なサージ電圧の発生によって電気機器に使用されている絶縁電線に部分放電（ＰＤ：Partial Discharge）が発生することがあり、この部分放電の発生によって、絶縁皮膜が劣化・損傷することが懸念されている。 In recent years, in order to increase the output of electrical equipment, inverter control at a high voltage has been performed, and accordingly, partial discharge (PD: (Partial Discharge) may occur, and there is a concern that this partial discharge may cause deterioration and damage of the insulating film.
ところで、平角絶縁電線は、コーナー部に丸め加工が施されているのが一般的である。このような平角絶縁電線を用いてコイルを成形すると、丸め加工が施されたコーナー部（角Ｒ部）にて隣り合う平角絶縁電線間（あるいは平角絶縁電線と平角絶縁電線を収容するスロットとの間）にギャップが生じてしまうため、コーナー部で部分放電が発生し易い。 By the way, it is general that the rectangular insulated wire is rounded at a corner portion. When a coil is formed using such a flat insulated wire, a rounded corner portion (corner R portion) is formed between adjacent flat insulated wires (or between a flat insulated wire and a slot that accommodates the flat insulated wire). A gap is generated between the corners, and partial discharge is likely to occur at the corners.
このような部分放電の発生による絶縁皮膜の劣化・損傷を防止するため、特許文献１では、コーナー部の膜厚Ａと、コーナー部の間の平坦な部分である平坦部の膜厚Ｂとが、Ａ≧０．６×Ｂの関係を満たす半導電層を断面平角状の導体上に形成した平角状電線が開示されている。 In order to prevent the deterioration and damage of the insulating film due to the occurrence of such partial discharge, in Patent Document 1, the film thickness A of the corner portion and the film thickness B of the flat portion, which is a flat portion between the corner portions, are obtained. , A rectangular electric wire in which a semiconductive layer satisfying the relationship of A ≧ 0.6 × B is formed on a conductor having a rectangular cross section is disclosed.
また、特許文献２では、コーナー部での絶縁皮膜の厚さが、平坦部での絶縁皮膜の厚さ以上であり、かつ、コーナー部の誘電率が平坦部の誘電率よりも小さい絶縁皮膜を導体上に形成した平角電線が開示されている。 Moreover, in patent document 2, the thickness of the insulating film in a corner part is more than the thickness of the insulating film in a flat part, and the dielectric constant of a corner part is smaller than the dielectric constant of a flat part. A rectangular electric wire formed on a conductor is disclosed.
このように、従来の平角絶縁電線では、絶縁皮膜のコーナー部の膜厚を大きくすることによって、コーナー部での部分放電の発生を抑制し、部分放電の発生による絶縁皮膜の劣化・損傷を防止していた。 In this way, with conventional rectangular insulated wires, by increasing the film thickness at the corners of the insulation film, the occurrence of partial discharge at the corners is suppressed, and deterioration and damage of the insulation film due to the occurrence of partial discharges are prevented. Was.
しかしながら、上述のようにコーナー部の絶縁皮膜の膜厚を大きくした平角絶縁電線を用いてコイルを成形した場合であっても、コイル成形後の部分放電開始電圧（ＰＤＩＶ：Partial Discharge Inception Voltage）の値が低くなってしまったり、ＰＤＩＶの値の大きさがばらついてしまうことがあった。 However, even when a coil is formed using a flat insulated wire having a thick insulating coating at the corner as described above, the partial discharge inception voltage (PDIV) after the coil is formed. In some cases, the value became low or the value of PDIV varied.
すなわち、コーナー部の絶縁皮膜の膜厚の大きさから想定され得るＰＤＩＶの値よりも低い電圧で部分放電が発生してしまうことがあり、コーナー部の膜厚を大きくしただけでは、安定して高い部分放電開始電圧が得られず、部分放電に対する耐性が十分であるとは言えなかった。 That is, partial discharge may occur at a voltage lower than the value of PDIV that can be assumed from the thickness of the insulating film at the corner, and it is stable only by increasing the thickness of the corner. A high partial discharge starting voltage could not be obtained, and it could not be said that the resistance against partial discharge was sufficient.
本発明は上記事情に鑑み為されたものであり、安定して高い部分放電開始電圧を有する平角絶縁電線を提供することを目的とする。 The present invention has been made in view of the above circumstances, and an object thereof is to provide a flat insulated wire having a stable and high partial discharge starting voltage.
本発明は上記目的を達成するために創案されたものであり、断面矩形状でコーナー部に丸め加工が施された平角導体と、該平角導体の外周に形成された樹脂からなる少なくとも１層の絶縁皮膜と、を備えた平角絶縁電線において、前記コーナー部での前記絶縁皮膜の膜厚をＴ3、前記コーナー部間の平坦部での前記絶縁皮膜の最薄膜厚をＴ1、最厚膜厚をＴ2としたとき、下式（１）
Ｔ1／Ｔ2＞０．１３×（Ｔ3／Ｔ2）＋０．７４ ・・・（１）
の関係を満たし、前記絶縁皮膜が、誘電率２．５以上の樹脂からなり、前記平坦部での前記絶縁皮膜の最薄膜厚Ｔ1と最厚膜厚Ｔ2との比（Ｔ1／Ｔ2）が、下式（２）
１＞Ｔ1／Ｔ2≧０．８５ ・・・（２）
の関係を満たす平角絶縁電線である。
The present invention has been devised to achieve the above object, and includes at least one layer of a rectangular conductor having a rectangular cross section and rounded corners, and a resin formed on the outer periphery of the rectangular conductor. In a flat insulated wire having an insulating film, the thickness of the insulating film at the corner portion is T 3 , the thinnest film thickness of the insulating film at the flat portion between the corner portions is T 1 , and the thickest film thickness when was the T 2, the following equation (1)
T 1 / T 2 > 0.13 × (T 3 / T 2 ) +0.74 (1)
The insulating film is made of a resin having a dielectric constant of 2.5 or more, and the ratio between the thinnest film thickness T 1 and the thickest film thickness T 2 of the insulating film at the flat part (T 1 / T 2 ) is the following formula (2)
1> T 1 / T 2 ≧ 0.85 (2)
It is a flat insulated wire satisfying the relationship.
前記コーナー部での前記絶縁皮膜の膜厚Ｔ3は、前記コーナー部での部分放電開始電圧が、予め設定した許容値以上となる厚さに形成されるとよい。 The thickness T 3 of the insulating film at the corner may be formed such that the partial discharge start voltage at the corner is equal to or greater than a preset allowable value.
前記絶縁皮膜が、誘電率３．５以上の樹脂からなり、前記平坦部での前記絶縁皮膜の最薄膜厚Ｔ1と最厚膜厚Ｔ2との比（Ｔ1／Ｔ2）が、下式（３）
１＞Ｔ1／Ｔ2≧０．８７ ・・・（３）
の関係を満たしてもよい。
The insulating film is made of a resin having a dielectric constant of 3.5 or more, and the ratio (T 1 / T 2 ) between the thinnest film thickness T 1 and the thickest film thickness T 2 of the insulating film at the flat portion is Formula (3)
1> T 1 / T 2 ≧ 0.87 (3)
May be satisfied.
前記コーナー部での前記絶縁皮膜の膜厚Ｔ3、前記コーナー部間の平坦部での前記絶縁皮膜の最薄膜厚Ｔ1、最厚膜厚Ｔ2が、下式（４）
Ｔ1／Ｔ2＞０．１３×（Ｔ3／Ｔ2）＋０．７９ ・・・（４）
の関係を満たしてもよい。
The thickness T 3 of the insulating film at the corner portion, the thinnest film thickness T 1 and the thickest film thickness T 2 of the insulating film at the flat portion between the corner portions are expressed by the following formula (4).
T 1 / T 2 > 0.13 × (T 3 / T 2 ) +0.79 (4)
May be satisfied.
本発明によれば、安定して高い部分放電開始電圧を有する平角絶縁電線を提供できる。 According to the present invention, it is possible to provide a flat insulated wire having a stable high partial discharge starting voltage.
本発明者らは、平角絶縁電線におけるコーナー部間の平坦な部分である平坦部、すなわちコイルを成形した際に隣り合う平角絶縁電線同士で接触する部分の絶縁皮膜の状態と部分放電との関係を鋭意検討した結果、平坦部に特定のギャップが生じた場合に、コーナー部で生じる部分放電よりも平坦部で生じる部分放電が支配的となり、当該ギャップの部分において部分放電が発生してしまい、実質的にＰＤＩＶの低下が起こることを見出し、本発明に至った。 The inventors of the present invention have described the relationship between the state of the insulating film and the partial discharge of the flat portion that is a flat portion between the corner portions in the flat insulated wire, that is, the portion that contacts the adjacent flat insulated wires when the coil is formed. As a result of intensive investigation, when a specific gap occurs in the flat portion, the partial discharge generated in the flat portion is dominant over the partial discharge generated in the corner portion, and the partial discharge occurs in the gap portion, It was found that PDIV substantially decreased, and the present invention was reached.
以下、本発明の実施の形態を添付図面にしたがって説明する。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
図１は、本実施の形態に係る平角絶縁電線を示す図であり、（ａ）は横断面図、（ｂ）はその要部拡大断面図である。また、図２は、図１の平角絶縁電線を用いたコイルの断面図である。 1A and 1B are diagrams showing a rectangular insulated wire according to the present embodiment, in which FIG. 1A is a transverse sectional view and FIG. 1B is an enlarged sectional view of an essential part thereof. FIG. 2 is a cross-sectional view of a coil using the flat insulated wire of FIG.
図１，２に示すように、平角絶縁電線１は、断面矩形状でコーナー部４に丸め加工が施された平角導体２と、平角導体２の外周に形成された樹脂からなる少なくとも１層の絶縁皮膜３と、を備えている。コイル１０は、本発明の平角絶縁電線１をスロット１１内に収容したものである。 As shown in FIGS. 1 and 2, the flat insulated wire 1 includes a rectangular conductor 2 having a rectangular cross section and rounded corner portions 4, and at least one layer of resin formed on the outer periphery of the flat conductor 2. And an insulating film 3. The coil 10 is obtained by housing the flat insulated wire 1 of the present invention in a slot 11.
平角導体２としては、良導電性金属を用いるとよく、例えば、銅、アルミニウム、銅合金等を用いるとよい。平角導体２のコーナー部（角Ｒ部）４の曲率半径は、コイル１０を成形した際の巻線密度を高くするために、なるべく小さくすることが望ましく、０．３ｍｍ以下とすることが望ましい。ここでは、平角導体２のコーナー部４の曲率半径を０．３ｍｍとした。 As the flat conductor 2, a highly conductive metal is preferably used, and for example, copper, aluminum, a copper alloy, or the like is preferably used. The radius of curvature of the corner portion (corner R portion) 4 of the flat conductor 2 is desirably as small as possible and desirably 0.3 mm or less in order to increase the winding density when the coil 10 is formed. Here, the radius of curvature of the corner portion 4 of the flat conductor 2 is 0.3 mm.
絶縁皮膜３は、平角導体２の外周に絶縁塗料を塗布し、焼付けして形成される。なお、部分放電開始電圧（ＰＤＩＶ）を低下させる観点からは、絶縁皮膜３をなるべく厚く形成することが望ましいが、実際にはサイズの規定等のために、絶縁皮膜３を無制限に厚くすることはできない。 The insulating film 3 is formed by applying an insulating paint to the outer periphery of the flat conductor 2 and baking it. In addition, from the viewpoint of lowering the partial discharge start voltage (PDIV), it is desirable to form the insulating film 3 as thick as possible, but in practice, in order to define the size, etc., it is not possible to increase the thickness of the insulating film 3 without limitation. Can not.
コーナー部４での絶縁皮膜３の膜厚Ｔ3は、コーナー部４での部分放電開始電圧（ＰＤＩＶ）が、予め設定した許容値（例えばピーク値で９００Ｖ）以上となる厚さに形成される。より具体的には、コーナー部４での絶縁皮膜３の膜厚Ｔ3は、４０μｍ以上とされることが望ましい。コーナー部４での絶縁皮膜３の膜厚Ｔ3の調整は、絶縁塗料を塗布する際に用いるダイスの形状を調節したり、あるいは絶縁塗料の粘度を調節することにより行うとよい。なお、ここでいうコーナー部４での絶縁皮膜３の膜厚Ｔ3とは、丸め加工が施されたコーナー部４の平角導体２の表面から絶縁皮膜３の表面までの最短距離（つまり、コーナー部４での絶縁皮膜３の最薄膜厚）のことである。 The film thickness T 3 of the insulating film 3 at the corner portion 4 is formed such that the partial discharge start voltage (PDIV) at the corner portion 4 is equal to or greater than a preset allowable value (for example, a peak value of 900 V). . More specifically, the film thickness T 3 of the insulating film 3 at the corner portion 4 is desirably 40 μm or more. The film thickness T 3 of the insulating film 3 at the corner 4 may be adjusted by adjusting the shape of the die used when applying the insulating paint or adjusting the viscosity of the insulating paint. Here, the film thickness T 3 of the insulating film 3 at the corner 4 is the shortest distance from the surface of the flat conductor 2 of the rounded corner 4 to the surface of the insulating film 3 (that is, the corner). (The thinnest film thickness of the insulating film 3 at the portion 4).
なお、絶縁塗料の粘度を高くし過ぎると、絶縁皮膜３の膜厚が不均一となり、製造工程におけるラインスピードも遅くする必要が生じ生産性も低下するため、絶縁塗料の粘度はある程度低くする必要がある。そのため、特にコーナー部４の曲率半径を小さくした場合には、平角導体２の外周に絶縁塗料をダイス塗布した際に、表面張力によりコーナー部４での絶縁塗料の膜厚が薄くなり、コーナー部４に形成される絶縁皮膜３の膜厚Ｔ3が薄くなってしまうことは避けられない。このような表面張力による影響等も考慮し、コーナー部４での絶縁皮膜３の膜厚Ｔ3を適宜な厚さに調整する必要がある。 If the viscosity of the insulating paint is too high, the film thickness of the insulating coating 3 becomes non-uniform, and it is necessary to slow down the line speed in the manufacturing process, resulting in a decrease in productivity. Therefore, the viscosity of the insulating paint needs to be lowered to some extent. There is. Therefore, especially when the radius of curvature of the corner portion 4 is reduced, when the insulating paint is applied to the outer periphery of the flat conductor 2, the film thickness of the insulating paint at the corner portion 4 becomes thin due to surface tension, and the corner portion 4 It is inevitable that the thickness T 3 of the insulating film 3 formed on the thin film 4 becomes thin. Considering the influence of such surface tension and the like, it is necessary to adjust the film thickness T 3 of the insulating film 3 at the corner portion 4 to an appropriate thickness.
ところで、図２に示すように、平角絶縁電線１の平坦部５同士、もしくは平角絶縁電線１の平坦部５とスロット１１とが接触した状態において、平坦部５に形成された絶縁皮膜３の膜厚が不均一である場合、接触面にギャップが生じてしまい、そのギャップ部分で部分放電が発生してしまう可能性がある。 By the way, as shown in FIG. 2, in the state where the flat portions 5 of the flat insulated wires 1 or between the flat portions 5 of the flat insulated wires 1 and the slots 11 are in contact with each other, the film of the insulating film 3 formed on the flat portions 5 is used. When the thickness is not uniform, a gap is generated on the contact surface, and partial discharge may occur in the gap portion.
図３に示すように、平坦部５に生じるギャップ３１の大きさによっては、平坦部５のＰＤＩＶがコーナー部４のＰＤＩＶよりも低くなり、コーナー部４で生じる部分放電３２よりも平坦部５で生じる部分放電３３が支配的となり、その結果、平角絶縁電線１全体のＰＤＩＶが低下してしまう。 As shown in FIG. 3, depending on the size of the gap 31 generated in the flat part 5, the PDIV of the flat part 5 is lower than the PDIV of the corner part 4, and the flat part 5 is higher than the partial discharge 32 generated in the corner part 4. The generated partial discharge 33 becomes dominant, and as a result, the PDIV of the entire flat insulated wire 1 is lowered.
そこで、本発明者らは、コーナー部４で十分なＰＤＩＶを確保した上で、絶縁皮膜３の膜厚分布を制御して平坦部５でのギャップ３１の生成を抑制することで、平坦部５のＰＤＩＶをコーナー部４のＰＤＩＶよりも高くし、コーナー部４での部分放電を優先的として平坦部５での部分放電の発生を抑制することを考えた。 Therefore, the present inventors secure a sufficient PDIV at the corner portion 4 and then control the film thickness distribution of the insulating film 3 to suppress the generation of the gap 31 at the flat portion 5, whereby the flat portion 5. The PDIV of the corner portion 4 is made higher than the PDIV of the corner portion 4, and partial discharge at the corner portion 4 is preferentially considered to suppress the occurrence of partial discharge at the flat portion 5.
より具体的には、本実施の形態に係る平角絶縁電線１は、図２に示すように、コーナー部４での絶縁皮膜３の膜厚をＴ3、コーナー部４間の平坦な部分である平坦部５での絶縁皮膜３の最薄膜厚をＴ1、最厚膜厚をＴ2としたとき、下式（１）
Ｔ1／Ｔ2＞０．１３×（Ｔ3／Ｔ2）＋０．７４ ・・・（１）
の関係を満たすものである。平坦部５での絶縁皮膜３の最薄膜厚Ｔ1、最厚膜厚Ｔ2の調整は、コーナー部４での絶縁皮膜３の膜厚Ｔ3と同様に、絶縁塗料を塗布する際に用いるダイスの形状や絶縁塗料の粘度を調節することにより行うことができる。なお、平坦部５での絶縁皮膜３の最厚膜厚Ｔ2は、例えば４０〜１５０μｍ程度である。本実施の形態では、平坦部５での絶縁皮膜３の最厚膜厚Ｔ2を６０μｍとした。
More specifically, as shown in FIG. 2, the flat insulated wire 1 according to the present embodiment is a flat portion between the corner portions 4 where the thickness of the insulating film 3 at the corner portions 4 is T 3 . When the thinnest film thickness of the insulating film 3 at the flat part 5 is T 1 and the maximum film thickness is T 2 , the following formula (1)
T 1 / T 2 > 0.13 × (T 3 / T 2 ) +0.74 (1)
It satisfies the relationship. The adjustment of the thinnest film thickness T 1 and the thickest film thickness T 2 of the insulating film 3 at the flat part 5 is used when applying the insulating paint, similarly to the film thickness T 3 of the insulating film 3 at the corner part 4. This can be done by adjusting the shape of the die and the viscosity of the insulating paint. Incidentally, most AtsumakuAtsu T 2 of the insulating film 3 of the flat portion 5 is, for example, about 40 to 150. In the present embodiment, the maximum thickness T 2 of the insulating film 3 in the flat portion 5 is set to 60 μm.
以下、式（１）の根拠について説明する。 Hereinafter, the basis of the formula (1) will be described.
３．２ｍｍ×１．８ｍｍの平角導体２の外周に絶縁皮膜３を形成した平角絶縁電線１を２本用い、２本の平角絶縁電線１の平坦部５同士を接触させて、図４に示すような背合せ試料４１を作製し、２本の平角絶縁電線１の平角導体２間に交流電源４２により交流電圧（周波数５０Ｈｚ）を印加してＰＤＩＶを測定した。平角導体２のコーナー部４の曲率半径は０．３ｍｍとし、ギャップ幅（くぼみ幅）Ｗ（図１（ｂ）参照）は０．４ｍｍとした。また、絶縁皮膜３の誘電率εは３．５とし、平坦部５での絶縁皮膜３の最厚膜厚Ｔ2は０．０６ｍｍとした。 Using two flat rectangular insulated wires 1 having an insulating film 3 formed on the outer periphery of a 3.2 mm × 1.8 mm rectangular conductor 2, the flat portions 5 of the two rectangular insulated wires 1 are brought into contact with each other, as shown in FIG. A back-to-back sample 41 was prepared, and an AC voltage (frequency 50 Hz) was applied between the flat conductors 2 of the two flat insulated wires 1 by an AC power source 42 to measure PDIV. The radius of curvature of the corner portion 4 of the flat conductor 2 was 0.3 mm, and the gap width (recess width) W (see FIG. 1B) was 0.4 mm. The dielectric constant ε of the insulating film 3 was 3.5, and the maximum thickness T 2 of the insulating film 3 at the flat portion 5 was 0.06 mm.
コーナー部４が絶縁皮膜３で均一に被覆された場合、すなわちＴ2＝Ｔ3＝０．０６ｍｍとした場合における、平坦部５でのＰＤＩＶとコーナー部４でのＰＤＩＶとの比（ＰＤＩＶ＠平坦部／ＰＤＩＶ＠コーナー部均一）と、Ｔ1／Ｔ2との関係を図５に示す。 The ratio of PDIV at the flat portion 5 and PDIV at the corner portion 4 (PDIV @ flat) when the corner portion 4 is uniformly coated with the insulating film 3, that is, when T 2 = T 3 = 0.06 mm. Part / PDIV @ corner part uniform) and T 1 / T 2 are shown in FIG.
図５に示すように、平坦部５での最薄膜厚Ｔ1が薄くなるほど、平坦部５でのＰＤＩＶは低下する。図５より、Ｔ1／Ｔ2が０．８７以上であれば、平坦部５でのＰＤＩＶとコーナー部４でのＰＤＩＶとの比（ＰＤＩＶ＠平坦部／ＰＤＩＶ＠コーナー部均一）が１以上、すなわち、コーナー部４でのＰＤＩＶが平坦部５でのＰＤＩＶと同じか、または高くなり、コーナー部４でのＰＤＩＶよりも平坦部５でのＰＤＩＶが高くなったときに、コーナー部４で優先的に部分放電が発生することが分かる。 As shown in FIG. 5, the PDIV at the flat portion 5 decreases as the thinnest film thickness T 1 at the flat portion 5 decreases. From FIG. 5, if T 1 / T 2 is 0.87 or more, the ratio of PDIV at the flat part 5 to PDIV at the corner part 4 (PDIV @ flat part / PDIV @ corner part uniform) is 1 or more. That is, when the PDIV at the corner portion 4 is the same as or higher than the PDIV at the flat portion 5, and the PDIV at the flat portion 5 is higher than the PDIV at the corner portion 4, the corner portion 4 has priority. It can be seen that partial discharge occurs.
さらに、均一被覆時（Ｔ2＝Ｔ3＝０．０６ｍｍ）のコーナー部４でのＰＤＩＶと偏肉したとき（Ｔ2≠Ｔ3）のコーナー部４でのＰＤＩＶとの比（ＰＤＩＶ＠コーナー部／ＰＤＩＶ＠コーナー部均一）と、Ｔ3／Ｔ2との関係を求めた。結果を図６に示す。 Further, the ratio of PDIV at the corner 4 when uniformly coated (T 2 = T 3 = 0.06 mm) and PDIV at the corner 4 when the thickness is uneven (T 2 ≠ T 3 ) (PDIV @ corner) / PDIV @ corner part uniform) and the relationship between T 3 and T 2 were obtained. The results are shown in FIG.
図６に示すように、均一被覆時（Ｔ2＝Ｔ3、Ｔ3／Ｔ2＝１）のＰＤＩＶを基準とすると、コーナー部４での絶縁皮膜３の膜厚Ｔ3が薄くなるほど、コーナー部４でのＰＤＩＶは低下している。 As shown in FIG. 6, when PDIV at the time of uniform coating (T 2 = T 3 , T 3 / T 2 = 1) is used as a reference, the thinner the film thickness T 3 of the insulating film 3 at the corner portion 4, the more the corner PDIV in part 4 is decreasing.
図５と図６より、コーナー部４での偏肉を考慮して、平坦部５でのＰＤＩＶとコーナー部４でのＰＤＩＶが等しくなる（ＰＤＩＶ＠平坦部／ＰＤＩＶ＠コーナー部＝１となる）ときのＴ1／Ｔ2とＴ3／Ｔ2との関係を求めると、図７に破線で示す直線のようになる。この破線で示す直線は、下式（５）
Ｔ1／Ｔ2＝０．１３×（Ｔ3／Ｔ2）＋０．７４ ・・・（５）
で表される。
From FIG. 5 and FIG. 6, considering the uneven thickness at the corner portion 4, PDIV at the flat portion 5 and PDIV at the corner portion 4 are equal (PDIV @ flat portion / PDIV @ corner portion = 1). When the relationship between T 1 / T 2 and T 3 / T 2 is obtained, a straight line indicated by a broken line in FIG. 7 is obtained. The straight line indicated by the broken line is the following formula (5)
T 1 / T 2 = 0.13 × (T 3 / T 2 ) +0.74 (5)
It is represented by
式（５）で表される直線は、平坦部５でのＰＤＩＶとコーナー部４でのＰＤＩＶが等しくなるときのＴ1／Ｔ2とＴ3／Ｔ2との関係であるから、平坦部５のＰＤＩＶをコーナー部４でのＰＤＩＶよりも高くするには、Ｔ1／Ｔ2とＴ3／Ｔ2との関係が、この直線よりも図示上側の領域にあればよい（つまり上述の式（１）を満たせばよい）ことになる。 Since the straight line represented by the equation (5) is the relationship between T 1 / T 2 and T 3 / T 2 when the PDIV at the flat portion 5 and the PDIV at the corner portion 4 are equal, the flat portion 5 Is higher than the PDIV at the corner 4, the relationship between T 1 / T 2 and T 3 / T 2 suffices to be in the region above the straight line (that is, the above formula ( 1) must be satisfied.
なお、本実施の形態では、さらに、平坦部５での部分放電を確実に抑えるために、放電のばらつきとして５％を加味して、破線の直線（式（５）の直線）を図示上側にスライドさせた実線の直線を用いることが好ましい。この実線の直線は、下式（６）
Ｔ1／Ｔ2＝０．１３×（Ｔ3／Ｔ2）＋０．７９ ・・・（６）
で表される。
In the present embodiment, in order to suppress partial discharge in the flat portion 5 with certainty, 5% is added as a variation in discharge, and a broken straight line (the straight line in the formula (5)) is on the upper side in the figure. It is preferable to use a slid solid line. This solid straight line is expressed by the following equation (6)
T 1 / T 2 = 0.13 × (T 3 / T 2 ) +0.79 (6)
It is represented by
Ｔ1／Ｔ2とＴ3／Ｔ2との関係が、この式（６）で表される直線よりも図示上側の領域であれば、放電のばらつきも考慮した上で、確実に平坦部５での部分放電の発生を抑制することが可能である。つまり、下式（４）
Ｔ1／Ｔ2＞０．１３×（Ｔ3／Ｔ2）＋０．７９ ・・・（４）
を満足すれば、平坦部５のＰＤＩＶをコーナー部４でのＰＤＩＶよりも高め、確実に平坦部５での部分放電の発生を抑制することが可能になる。ここでは、放電のばらつきを５％としたが、これは放電のばらつきを示す値として一般的な値である。
If the relationship between T 1 / T 2 and T 3 / T 2 is a region on the upper side in the drawing from the straight line represented by the equation (6), the flat portion 5 is surely taken into consideration in consideration of discharge variation. It is possible to suppress the occurrence of partial discharge. That is, the following formula (4)
T 1 / T 2 > 0.13 × (T 3 / T 2 ) +0.79 (4)
If satisfied, the PDIV of the flat portion 5 can be made higher than the PDIV at the corner portion 4, and the occurrence of partial discharge in the flat portion 5 can be reliably suppressed. Here, the variation in discharge is set to 5%, but this is a general value indicating the variation in discharge.
次に、絶縁皮膜３の誘電率εの影響について検討する。 Next, the influence of the dielectric constant ε of the insulating film 3 will be examined.
コーナー部４が絶縁皮膜３で均一に被覆された場合、すなわちＴ2＝Ｔ3＝０．０６ｍｍとした場合において、絶縁皮膜３の誘電率εを２．５，３．５，４．０と変化させて、平坦部５でのＰＤＩＶとコーナー部４でのＰＤＩＶとの比（ＰＤＩＶ＠平坦部／ＰＤＩＶ＠コーナー部均一）と、Ｔ1／Ｔ2との関係を求めた。結果を図８に示す。 When the corner portion 4 is uniformly coated with the insulating film 3, that is, when T 2 = T 3 = 0.06 mm, the dielectric constant ε of the insulating film 3 is 2.5, 3.5, 4.0. By changing, the ratio between PDIV at the flat portion 5 and PDIV at the corner portion 4 (PDIV @ flat portion / PDIV @ corner portion uniform) and T 1 / T 2 was determined. The results are shown in FIG.
図８に示すように、誘電率εが小さくなるほど、平坦部５でのＰＤＩＶが増加している。平坦部５でのＰＤＩＶとコーナー部４でのＰＤＩＶとの比（ＰＤＩＶ＠平坦部／ＰＤＩＶ＠コーナー部均一）が１以上となるときのＴ1／Ｔ2の値は、誘電率εが２．５のときは０．８５以上、誘電率εが３．５のときは０．８７以上、誘電率εが４．０のときは０．８８以上となる。この傾向から、誘電率εを２．５未満とした場合には、平坦部５でのＰＤＩＶとコーナー部４でのＰＤＩＶとの比（ＰＤＩＶ＠平坦部／ＰＤＩＶ＠コーナー部均一）が１となるときのＴ1／Ｔ2の値は、０．８５未満の値となると考えられる。なお、Ｔ1は最薄膜厚、Ｔ2は最厚膜厚であるからＴ1／Ｔ2の値は１以上となることはない。 As shown in FIG. 8, the PDIV at the flat part 5 increases as the dielectric constant ε decreases. The value of T 1 / T 2 when the ratio of PDIV at the flat part 5 to PDIV at the corner part 4 (PDIV @ flat part / PDIV @ corner part uniform) is 1 or more is that the dielectric constant ε is 2. 5 is 0.85 or more, when the dielectric constant ε is 3.5, it is 0.87 or more, and when the dielectric constant ε is 4.0, it is 0.88 or more. From this tendency, when the dielectric constant ε is less than 2.5, the ratio of PDIV at the flat portion 5 to PDIV at the corner portion 4 (PDIV @ flat portion / PDIV @ corner portion uniform) is 1. The value of T 1 / T 2 at that time is considered to be a value less than 0.85. Since T 1 is the thinnest film thickness and T 2 is the thickest film thickness, the value of T 1 / T 2 never becomes 1 or more.
したがって、絶縁皮膜３が誘電率２．５以上の樹脂からなる場合には、平坦部５での絶縁皮膜３の最薄膜厚Ｔ1と最厚膜厚Ｔ2との比（Ｔ1／Ｔ2）が、下式（２）
１＞Ｔ1／Ｔ2≧０．８５ ・・・（２）
の関係を満たせば、平坦部５でのＰＤＩＶとコーナー部４でのＰＤＩＶとの比（ＰＤＩＶ＠平坦部／ＰＤＩＶ＠コーナー部均一）が１以上となり、平坦部５での部分放電の発生を抑制することができる。
Therefore, when the insulating film 3 is made of a resin having a dielectric constant of 2.5 or more, the ratio (T 1 / T 2) between the thinnest film thickness T 1 and the thickest film thickness T 2 of the insulating film 3 in the flat portion 5. ) Is the following formula (2)
1> T 1 / T 2 ≧ 0.85 (2)
If the above relationship is satisfied, the ratio of PDIV at the flat part 5 to PDIV at the corner part 4 (PDIV @ flat part / PDIV @ corner part uniform) becomes 1 or more, and the occurrence of partial discharge at the flat part 5 is suppressed. can do.
また、絶縁皮膜３が誘電率３．５以上の樹脂からなる場合には、平坦部５での絶縁皮膜３の最薄膜厚Ｔ1と最厚膜厚Ｔ2との比（Ｔ1／Ｔ2）が、下式（３）
１＞Ｔ1／Ｔ2≧０．８７ ・・・（３）
の関係を満たせば、平坦部５での部分放電の発生を抑制することができる。
When the insulating film 3 is made of a resin having a dielectric constant of 3.5 or more, the ratio (T 1 / T 2) between the thinnest film thickness T 1 and the thickest film thickness T 2 of the insulating film 3 in the flat portion 5. ) Is the following formula (3)
1> T 1 / T 2 ≧ 0.87 (3)
If this relationship is satisfied, the occurrence of partial discharge in the flat portion 5 can be suppressed.
なお、式（２）や式（３）の関係は、コーナー部４が絶縁皮膜３で均一に被覆された場合において導かれた関係であるが、上述のように、コーナー部４の絶縁皮膜３の膜厚Ｔ3が小さくなるほどコーナー部４でのＰＤＩＶが低下して平坦部５で部分放電が発生しにくくなる（図６参照）ので、式（２）や式（３）の関係を満たせば、コーナー部４の絶縁皮膜３の膜厚Ｔ3が小さくなった場合であっても、平坦部５での部分放電の発生を抑制できることになる。 In addition, although the relationship of Formula (2) and Formula (3) is a relationship derived when the corner portion 4 is uniformly coated with the insulating coating 3, as described above, the insulating coating 3 of the corner portion 4 is used. As the film thickness T 3 becomes smaller, the PDIV at the corner portion 4 decreases and partial discharge is less likely to occur at the flat portion 5 (see FIG. 6). Therefore, if the relationship of the equations (2) and (3) is satisfied Even when the film thickness T 3 of the insulating film 3 in the corner portion 4 is reduced, the occurrence of partial discharge in the flat portion 5 can be suppressed.
次に、ギャップ幅Ｗの影響について検討する。 Next, the influence of the gap width W will be examined.
コーナー部４が絶縁皮膜３で均一に被覆された場合、すなわちＴ2＝Ｔ3＝０．０６ｍｍとした場合において、ギャップ幅Ｗを０．３ｍｍ〜１．１ｍｍの範囲で変化させたときの、平坦部５でのＰＤＩＶとコーナー部４でのＰＤＩＶとの比（ＰＤＩＶ＠平坦部／ＰＤＩＶ＠コーナー部均一）を求めた。結果を図９に示す。 When the corner portion 4 is uniformly coated with the insulating film 3, that is, when T 2 = T 3 = 0.06 mm, the gap width W is changed in the range of 0.3 mm to 1.1 mm. The ratio of PDIV at the flat part 5 and PDIV at the corner part 4 (PDIV @ flat part / PDIV @ corner part uniform) was determined. The results are shown in FIG.
図９に示すように、平坦部５での絶縁皮膜３の最厚膜厚Ｔ2と最薄膜厚Ｔ1との差（Ｔ2−Ｔ1）を０．００５ｍｍ、０．０１ｍｍ、０．０２ｍｍとしたいずれの場合においても、平坦部５でのＰＤＩＶの値の変化は殆どなかった。つまり、ギャップ幅Ｗが変化しても、平坦部５でのＰＤＩＶの値の変化は小さく、ギャップ幅ＷのＰＤＩＶに対する影響は殆どない。 As shown in FIG. 9, the difference (T 2 −T 1 ) between the maximum thickness T 2 and the minimum thickness T 1 of the insulating film 3 in the flat portion 5 is 0.005 mm, 0.01 mm, 0.02 mm. In either case, there was almost no change in the value of PDIV at the flat portion 5. That is, even if the gap width W changes, the change in the value of PDIV in the flat portion 5 is small, and the gap width W has little influence on PDIV.
以上説明したように、本実施の形態に係る平角絶縁電線１は、下式（１）
Ｔ1／Ｔ2＞０．１３×（Ｔ3／Ｔ2）＋０．７４ ・・・（１）
の関係を満たしている。
As described above, the flat insulated wire 1 according to the present embodiment is represented by the following formula (1).
T 1 / T 2 > 0.13 × (T 3 / T 2 ) +0.74 (1)
Meet the relationship.
これにより、平坦部５のＰＤＩＶをコーナー部４でのＰＤＩＶよりも高め、確実に平坦部５での部分放電の発生を抑制することができる。 Thereby, PDIV of the flat part 5 can be made higher than PDIV in the corner part 4, and generation | occurrence | production of the partial discharge in the flat part 5 can be suppressed reliably.
その結果、コーナー部４の絶縁皮膜３の膜厚の大きさから想定され得るＰＤＩＶの値よりも低い電圧で部分放電が発生してしまうことがなくなり、安定して高いＰＤＩＶを有する平角絶縁電線１を実現できる。 As a result, there is no occurrence of partial discharge at a voltage lower than the value of PDIV that can be assumed from the thickness of the insulating film 3 in the corner portion 4, and the rectangular insulated wire 1 having a high PDIV stably. Can be realized.
また、本実施の形態では、コーナー部４での絶縁皮膜３の膜厚Ｔ3を、コーナー部４でのＰＤＩＶが、予め設定した許容値以上となる厚さに形成しているため、コーナー部４での部分放電を許容範囲内に抑えることができ、平角絶縁電線１全体のＰＤＩＶを向上できる。 In the present embodiment, since the film thickness T 3 of the insulating film 3 at the corner portion 4 is formed to a thickness at which the PDIV at the corner portion 4 is greater than or equal to a preset allowable value, 4 can be suppressed within an allowable range, and the PDIV of the entire flat insulated wire 1 can be improved.
本発明は上記実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々の変更を加え得ることは勿論である。 The present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the spirit of the present invention.
１ 平角絶縁電線
２ 平角導体
３ 絶縁皮膜
４ コーナー部
５ 平坦部
1 Flat insulated wire 2 Flat conductor 3 Insulating film 4 Corner part 5 Flat part
Claims (4)
該平角導体の外周に形成された樹脂からなる少なくとも１層の絶縁皮膜と、
を備えた平角絶縁電線において、
前記コーナー部での前記絶縁皮膜の膜厚をＴ3、前記コーナー部間の平坦部での前記絶縁皮膜の最薄膜厚をＴ1、最厚膜厚をＴ2としたとき、下式（１）
Ｔ1／Ｔ2＞０．１３×（Ｔ3／Ｔ2）＋０．７４ ・・・（１）
の関係を満たし、
前記絶縁皮膜が、誘電率２．５以上の樹脂からなり、
前記平坦部での前記絶縁皮膜の最薄膜厚Ｔ1と最厚膜厚Ｔ2との比（Ｔ1／Ｔ2）が、下式（２）
１＞Ｔ1／Ｔ2≧０．８５ ・・・（２）
の関係を満たす
ことを特徴とする平角絶縁電線。 A rectangular conductor with a rectangular cross section and rounded corners;
At least one insulating film made of a resin formed on the outer periphery of the rectangular conductor;
In a flat insulated wire with
When the film thickness of the insulating film at the corner part is T 3 , the thinnest film thickness of the insulating film at the flat part between the corner parts is T 1 , and the maximum film thickness is T 2 , the following formula (1 )
T 1 / T 2 > 0.13 × (T 3 / T 2 ) +0.74 (1)
Satisfy the relationship
The insulating film is made of a resin having a dielectric constant of 2.5 or more,
The ratio (T 1 / T 2 ) between the thinnest film thickness T 1 and the thickest film thickness T 2 of the insulating film in the flat part is expressed by the following formula (2)
1> T 1 / T 2 ≧ 0.85 (2)
A flat insulated wire characterized by satisfying the following relationship.
請求項１記載の平角絶縁電線。 The thickness T 3 of the insulating film at the corner portion, the partial discharge starting voltage at the corners, rectangular insulated wire according to claim 1, wherein is formed to a thickness of the allowable value or more set in advance.
前記平坦部での前記絶縁皮膜の最薄膜厚Ｔ1と最厚膜厚Ｔ2との比（Ｔ1／Ｔ2）が、下式（３）
１＞Ｔ1／Ｔ2≧０．８７ ・・・（３）
の関係を満たす
請求項１または２記載の平角絶縁電線。 The insulating film is made of a resin having a dielectric constant of 3.5 or more,
The ratio (T 1 / T 2 ) between the thinnest film thickness T 1 and the thickest film thickness T 2 of the insulating film in the flat part is expressed by the following formula (3)
1> T 1 / T 2 ≧ 0.87 (3)
The flat insulated wire according to claim 1 or 2, wherein the relationship is satisfied.
Ｔ1／Ｔ2＞０．１３×（Ｔ3／Ｔ2）＋０．７９ ・・・（４）
の関係を満たす
請求項１〜３いずれかに記載の平角絶縁電線。 The thickness T 3 of the insulating film at the corner portion, the thinnest film thickness T 1 and the thickest film thickness T 2 of the insulating film at the flat portion between the corner portions are expressed by the following formula (4).
T 1 / T 2 > 0.13 × (T 3 / T 2 ) +0.79 (4)
The flat insulated wire according to any one of claims 1 to 3, wherein the relationship is satisfied.
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| JP2011247352A Pending JP2013105566A (en) | 2011-11-11 | 2011-11-11 | Flat insulated wire |
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| JP (1) | JP2013105566A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018025832A1 (en) * | 2016-08-02 | 2018-02-08 | 株式会社デンソー | Insulated wire, coil and dynamo-electric machine |
| US11232885B2 (en) | 2015-10-28 | 2022-01-25 | Essex Furukawa Magnet Wire Japan Co., Ltd. | Insulated wire, method of producing insulated wire, coil, rotating electrical machine, and electrical or electronic equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011187262A (en) * | 2010-03-08 | 2011-09-22 | Hitachi Magnet Wire Corp | Polyamideimide resin insulation coating and insulated wire using the same |
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2011
- 2011-11-11 JP JP2011247352A patent/JP2013105566A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011187262A (en) * | 2010-03-08 | 2011-09-22 | Hitachi Magnet Wire Corp | Polyamideimide resin insulation coating and insulated wire using the same |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11232885B2 (en) | 2015-10-28 | 2022-01-25 | Essex Furukawa Magnet Wire Japan Co., Ltd. | Insulated wire, method of producing insulated wire, coil, rotating electrical machine, and electrical or electronic equipment |
| WO2018025832A1 (en) * | 2016-08-02 | 2018-02-08 | 株式会社デンソー | Insulated wire, coil and dynamo-electric machine |
| US20190156978A1 (en) * | 2016-08-02 | 2019-05-23 | Denso Corporation | Insulated electrical wire, coil, and rotary electric machine |
| CN109983654A (en) * | 2016-08-02 | 2019-07-05 | 株式会社电装 | Insulated electric conductor, coil and rotating electric machine |
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