WO2016111204A1 - Bobine pour machine électrique rotative - Google Patents

Bobine pour machine électrique rotative Download PDF

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Publication number
WO2016111204A1
WO2016111204A1 PCT/JP2015/086276 JP2015086276W WO2016111204A1 WO 2016111204 A1 WO2016111204 A1 WO 2016111204A1 JP 2015086276 W JP2015086276 W JP 2015086276W WO 2016111204 A1 WO2016111204 A1 WO 2016111204A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductive polymer
layer
tape
insulating layer
insulation
Prior art date
Application number
PCT/JP2015/086276
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English (en)
Japanese (ja)
Inventor
康行 明石
肇夫 潮湖
Original Assignee
株式会社 明電舎
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社 明電舎 filed Critical 株式会社 明電舎
Publication of WO2016111204A1 publication Critical patent/WO2016111204A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/06—Insulation of windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/10—Applying solid insulation to windings, stators or rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges

Definitions

  • the present invention relates to a coil of a rotating electrical machine.
  • the present invention employs a unique material as a material for the internal discharge prevention layer provided in the insulating layer in the stator coil of the generator, thereby preventing winding in the insulating layer and preventing the winding operation by a machine. It is devised so that it can be done.
  • Generators are exposed to large loads such as large currents and high voltages during operation. Such a generator is generally required to have a useful life of 20 years or more. Moreover, the generator is one of important facilities, and if it fails, it will have a great economic impact. For these reasons, insulation techniques for protecting the generator from high loads are very important.
  • FIG. 5 is a cross-sectional view showing a stator coil 10 of a generator according to the prior art.
  • a strand insulation layer 12 is formed on the outer peripheral surface of the strand 11.
  • a strand of wires is formed by the four strands 11 provided with the strand insulation layer 12.
  • An interlayer insulating layer 13 is formed on the outer peripheral surface of the wire bundle (the portion of the wire insulating layer 12 located on the outer peripheral surface of the wire bundle).
  • a strand group is formed in a state in which four strands of wires in which the interlayer insulating layer 13 is formed are arranged.
  • a main insulating layer 14 is formed on the outer peripheral surface of the strand group (a portion of the interlayer insulating layer 13 located on the outer peripheral surface of the strand group).
  • a corona prevention layer 15 is formed on the outer peripheral surface of the main insulating layer 14.
  • the corona prevention layer 15 is formed of a low resistance material, and prevents corona from being generated between the main insulating layer 14 and the iron core to which the stator coil 10 is attached.
  • FIG. 6 is a cross-sectional view showing another example of a stator coil 10A of a generator according to the prior art.
  • 11 is a strand
  • 12 is a strand insulation layer
  • 14 is a main insulation layer
  • 15 is a corona prevention layer.
  • This stator coil 10A does not include an interlayer insulating layer.
  • an internal discharge prevention layer is provided at a position between the interlayer insulating layer 13 and the main insulating layer 14, or in the stator coil 10A shown in FIG.
  • An internal discharge prevention layer is provided inside.
  • the material for the internal discharge prevention layer is generally a glass fiber or polymer material such as polyester as a base material, and carbon is mixed into this base material (glass fiber or polymer material) to prevent discharge. Material is used.
  • This tape-like discharge preventing material is a low resistance material in which the resistance of the tape surface is lowered because carbon is mixed therein.
  • JP 2002-125339 A Japanese Unexamined Patent Publication No. 2000-60047
  • a tape-like insulating material is automatically wound using a machine called a taping machine.
  • a tape-shaped discharge preventing material mixed with carbon is wound around a coil using a taping machine, carbon enters the inside of the taping machine and causes a failure of the taping machine.
  • the tape-like discharge preventing material mixed with carbon cannot be wound by a machine, and it is necessary to perform a winding operation by a human hand, so that workability is remarkably lowered.
  • the discharge prevention effect is not always obtained. That is, when the resistance value of the discharge preventing material is not appropriate, it may interfere with the resistance value of other insulating materials, and a sufficient discharge preventing effect may not be obtained.
  • FIG. 7 in which a part of the stator coil 10 shown in FIG. 5 is extracted, in the stator coil 10 of the generator, between the strand insulation layer 12 and the interlayer insulation layer 13 or adjacent elements.
  • a gap G tends to occur at an insulation boundary such as between the line insulation layers 12 and 12 or between adjacent interlayer insulation layers 13 and 13. When such a gap G is generated, corona is generated and the insulating layer is likely to deteriorate.
  • FIG. 8 showing the electric field analysis state of the stator coil of the generator
  • the insulation of the stator coil 10 of the generator for example, the corner of the stator coil, the interlayer insulation 13 and the main insulation 14 or the like.
  • Electric field concentration occurs at an insulating boundary such as between.
  • partial discharge occurs here.
  • the insulation is eroded by the partial discharge and eventually leads to dielectric breakdown.
  • the black-painted portion is the portion where the electric field is concentrated.
  • Fig. 9 shows the flow of the deterioration of the generator stator coil insulation.
  • a thermal load is applied to the insulating layer of the stator coil of the generator, voids (clearances) and peeling are caused in the insulating layer, and further, the resin is withered. It is considered that when an electrical load is applied in this state, a partial discharge is generated inside the insulating layer, and finally dielectric breakdown occurs due to the partial discharge. Therefore, by suppressing the partial discharge, the insulation reliability of the generator stator is improved.
  • the present invention can form an internal discharge prevention layer provided in an insulating layer by mechanical winding with good workability, and can further prevent the generation of corona, and has a high insulation reliability and can provide a rotating electrical machine.
  • An object of the present invention is to provide a coil.
  • the present invention that solves the above-described problems is provided in a coil of a rotating electrical machine that includes a strand inside, an insulating layer is formed on the outer peripheral side of the strand, and an internal discharge prevention layer is formed in the insulating layer.
  • the internal discharge prevention layer is formed by winding a conductive polymer tape in which a conductive polymer material is formed in a tape shape.
  • a plurality of layers are formed as the insulating layer
  • the internal discharge prevention layer is formed between different insulating layers among the plurality of insulating layers, or inside a specific insulating layer determined in advance among the plurality of insulating layers.
  • the present invention is also characterized in that the conductive polymer tape is formed by coating a conductive polymer on the surface of a tape-shaped polymer material.
  • the present invention is also characterized in that the conductive polymer tape is formed by coating a conductive polymer on the surface of a tape-like polymer material having heat shrinkability.
  • the heat-shrinkable polymer material include polyester, polyimide, and polyethylene naphthalate.
  • an insulation resistance value of the surface of the conductive polymer tape is 10 1 ⁇ to 10 4 ⁇ .
  • the conductive polymer material is a material in which a conductive polymer is coated on the surface of a film sheet material (polymer material) such as polyester, and is used as a material for capacitors, organic EL, and solar cells.
  • the internal discharge prevention layer is formed by winding a conductive polymer tape in which a conductive polymer material is formed in a tape shape, the machine can be wound, and the insulating material It is possible to electrically couple the gaps well. Furthermore, by making the resistance value of the conductive polymer tape optimal, a sufficient discharge preventing effect can be achieved.
  • Sectional drawing which shows the stator coil of the generator based on the Example of this invention.
  • the conceptual diagram which shows the insulation system in the Example of this invention.
  • the characteristic view which shows the electric field load reduction effect in an internal discharge prevention layer.
  • the characteristic view which shows the resistance value of a conductive polymer tape, and the electric field load of the interlayer insulation layer at that time.
  • Sectional drawing which shows the stator coil of the generator which concerns on a prior art.
  • Sectional drawing which shows the stator coil of the generator of the other example which concerns on a prior art.
  • Sectional drawing which shows the clearance gap between the stator coils of the generator which concerns on a prior art.
  • the characteristic view which shows the electric field analysis state of the stator coil of the generator which concerns on a prior art.
  • the flowchart which shows the flow which the insulation of the stator coil of a generator deteriorates.
  • FIG. 1 is a cross-sectional view showing a stator coil 110 of a generator according to an embodiment of the present invention.
  • a strand insulation layer 112 is formed on the outer peripheral surface of the strand 111.
  • a strand of wires is formed by the four strands 111 provided with the strand insulation layer 112.
  • An interlayer insulating layer 113 is formed on the outer peripheral surface of the wire bundle (the portion of the wire insulating layer 112 located on the outer peripheral surface of the wire bundle).
  • a strand group is formed in a state in which four strands of wires in which the interlayer insulating layer 113 is formed are arranged.
  • An internal discharge prevention layer 120 is formed on the outer peripheral surface of the strand group (a portion of the interlayer insulating layer 113 located on the outer circumferential surface of the strand group).
  • the internal discharge prevention layer 120 of this embodiment is formed by winding a conductive polymer tape.
  • the conductive polymer tape used in this example is obtained by coating a surface of a tape-like polyester (base material) having heat shrinkability with a conductive polymer, and the insulation resistance value of the surface is 10 1 ⁇ . ⁇ 10 4 ⁇ .
  • a main insulating layer 114 is formed on the outer peripheral surface of the internal discharge prevention layer 120.
  • a corona prevention layer 115 is formed on the outer peripheral surface of the main insulating layer 114.
  • the corona prevention layer 115 is formed of a low resistance material, and prevents corona from being generated between the main insulating layer 114 and the iron core to which the stator coil 10 is attached.
  • stator coil 110 configured as described above will be described below.
  • a conductive polymer tape formed by coating a conductive polymer on the surface of a tape-like polyester having heat shrinkability is wound to form an internal discharge prevention layer 120.
  • the internal discharge prevention layer 120 is disposed between the interlayer insulating layer 113 and the main insulating layer 114. Since the internal discharge prevention layer 120 has a low resistance value, the interlayer insulating layer 113 and the main insulating layer 114 are electrically connected, and as a result, partial discharge between the interlayer insulating layer 113 and the main insulating layer 114 is suppressed. be able to.
  • the conductive polymer tape (internal discharge prevention layer 120) and the interlayer insulating layer 113 are electrically connected. Therefore, it can be regarded as an insulating system in which the interlayer insulating layer 113 and the conductive polymer tape (internal discharge prevention layer 120) are integrated (see FIG. 2).
  • the electric field of the interlayer insulating layer 113 is calculated, the electric field of the interlayer insulating layer 113 is reduced to 70% or less by using a conductive polymer tape (internal discharge prevention layer 120) as shown in FIG.
  • a conductive polymer tape internal discharge prevention layer 120
  • the base material of the conductive polymer tape forming the internal discharge prevention layer 120 provided between the interlayer insulating layer 113 and the main insulating layer 114 is a heat shrinkable material such as polyester.
  • the stator coil insulation of the generator for example, between adjacent wire insulation layers, between adjacent interlayer insulation layers, or between a wire insulation layer and an interlayer
  • the gap G is easily formed between the insulating layers and between the insulating layers such as the interlayer insulating layer and the main insulating layer.
  • a conductive polymer tape (internal discharge prevention layer 120) using a heat shrink material such as polyester as a base material is provided between the interlayer insulating layer 113 and the main insulating layer 114, Such a gap G can be filled.
  • the generator stator generally has a structure that reduces mechanical load such as electromagnetic vibration by molding resin by a technique such as heat compression or vacuum pressure impregnation.
  • the conductive polymer tape is applied by the heat applied in the heating compression and vacuum pressure impregnation steps described above. Shrinkage occurs and the gap G can be filled.
  • the gap G can be filled, thus preventing the generation of corona and improving the insulation reliability. can do.
  • polyester as the base material for the conductive polymer tape, it can have mechanical strength that can withstand tension during automatic winding by a machine.
  • a tape-like insulating material is automatically wound around a coil conductor that becomes a stator coil of a generator, the tape is cut during the automatic winding unless the mechanical strength of the tape is sufficiently strong.
  • polyester is suitable for automatic winding because it has high mechanical strength such as tensile strength and has stretchability.
  • the insulation resistance value of the surface of the conductive polymer tape forming the internal discharge prevention layer 120 is set to 10 1 ⁇ to 10 4 ⁇ .
  • the internal discharge prevention layer 120 made of a conductive polymer tape between the interlayer insulating layer 113 and the main insulating layer 114 of the stator coil 110, the electric field load on the interlayer insulating layer 113 is reduced. can do.
  • the conductive polymer generally refers to a material having a sufficiently low resistance value compared to a normal polymer material, and specifically, a material having a resistance value of about 10 10 ⁇ or less.
  • mica In a generator stator, mica is generally used as an insulating material.
  • the resistance value of mica is generally about 10 10 to 10 13 ⁇ depending on the type. Therefore, if a conductive polymer of about 10 10 ⁇ is used, it interferes with the insulation resistance of mica, so that a sufficient electric field load reduction effect cannot be obtained.
  • FIG. 4 shows the resistance value of the conductive polymer tape and the electric field load of the interlayer insulating layer at that time.
  • FIG. 4 shows the calculated values when the insulation resistance value of mica is assumed to be 10 10 ⁇ .
  • the resistance value of the conductive polymer tape when the resistance value of the conductive polymer tape is 100 k ⁇ or less, the electric field load on the interlayer insulating layer is reduced to about 70%. However, when the resistance value of the conductive polymer tape is 100 k ⁇ , the electric field load reducing effect is lower than when the resistance value is 10 k ⁇ or less. Considering the variation of the mica insulation resistance for each material, there is no guarantee that the effect of reducing the electric field load can be reliably obtained when the resistance value of the conductive polymer tape is 100 k ⁇ . For this reason, the resistance value of the conductive polymer tape is preferably about 10 1 to 10 4 ⁇ .
  • an internal discharge prevention layer formed by winding a conductive polymer tape may be formed between the wire insulation layer and the interlayer insulation layer or inside the main insulation layer. The effect of.
  • the conductive polymer tape is not limited to tape-like polyester, but may be formed by coating a conductive polymer on the surface of another tape-like polymer material.
  • the present invention can be applied not only to the stator coil of the generator but also to the coil of each rotating electric machine.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

L'invention concerne une bobine de stator (110), formée sur le côté circonférentiel externe du câblage (111), dans laquelle se trouvent des couches d'isolation de câblage (112), des couches d'isolation inter-couche (113), une couche d'isolation principale (114), une couche de prévention d'effet couronne (115) et une couche de prévention de décharge interne (120). La couche de prévention de décharge interne (120) est formée entre les couches d'isolation inter-couche (113) et la couche d'isolation principale (114), et elle est formée en enroulant un ruban de polymère conducteur, lequel est formé par enduction d'un polymère conducteur sur la surface d'un matériau polyester en forme de bande ayant des propriétés de rétraction thermique. Le ruban de polymère conducteur peut être enroulé à la machine, fixe les couches d'isolation en étant rétracté thermiquement, et démontre un effet de prévention de décharge. Grâce à cette configuration, la décharge dans les couches d'isolation peut être empêchée de manière fiable et la couche de prévention de décharge interne peut être formée par enroulement à la machine.
PCT/JP2015/086276 2015-01-06 2015-12-25 Bobine pour machine électrique rotative WO2016111204A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-000616 2015-01-06
JP2015000616A JP6014833B2 (ja) 2015-01-06 2015-01-06 回転電機のコイル

Publications (1)

Publication Number Publication Date
WO2016111204A1 true WO2016111204A1 (fr) 2016-07-14

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PCT/JP2015/086276 WO2016111204A1 (fr) 2015-01-06 2015-12-25 Bobine pour machine électrique rotative

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WO (1) WO2016111204A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020171073A (ja) * 2019-04-01 2020-10-15 株式会社明電舎 回転機固定子絶縁構造

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000060047A (ja) * 1998-08-07 2000-02-25 Mitsubishi Electric Corp 回転電機の固定子コイル
JP2001525654A (ja) * 1997-11-28 2001-12-11 エービービー エービー 開閉所
JP2007282410A (ja) * 2006-04-10 2007-10-25 Toshiba Corp 回転電機の固定子コイル、回転電機の固定子コイルの製造方法、半導電性シート、半導電性テープ、および回転電機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001525654A (ja) * 1997-11-28 2001-12-11 エービービー エービー 開閉所
JP2000060047A (ja) * 1998-08-07 2000-02-25 Mitsubishi Electric Corp 回転電機の固定子コイル
JP2007282410A (ja) * 2006-04-10 2007-10-25 Toshiba Corp 回転電機の固定子コイル、回転電機の固定子コイルの製造方法、半導電性シート、半導電性テープ、および回転電機

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JP6014833B2 (ja) 2016-10-26
JP2016127720A (ja) 2016-07-11

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