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WO1997007585A2 - Stator de machine electrique et procede d'impregnation et d'isolation du stator d'une machine electrique - Google Patents

Stator de machine electrique et procede d'impregnation et d'isolation du stator d'une machine electrique Download PDF

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Publication number
WO1997007585A2
WO1997007585A2 PCT/DE1996/001489 DE9601489W WO9707585A2 WO 1997007585 A2 WO1997007585 A2 WO 1997007585A2 DE 9601489 W DE9601489 W DE 9601489W WO 9707585 A2 WO9707585 A2 WO 9707585A2
Authority
WO
WIPO (PCT)
Prior art keywords
stator
powder coating
powder
insulation layer
impregnating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DE1996/001489
Other languages
German (de)
English (en)
Other versions
WO1997007585A3 (fr
Inventor
Rainer Müller
Michael Schulten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO1997007585A2 publication Critical patent/WO1997007585A2/fr
Publication of WO1997007585A3 publication Critical patent/WO1997007585A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines

Definitions

  • Stator for an electrical machine and method for impregnating and isolating the stator of an electrical machine
  • the invention relates to a stator, which has an insulation layer, for an electrical machine, in particular for a turbogenerator. Furthermore, the invention relates to a method for impregnating and isolating the stator of an electrical machine, in particular a large machine with an electrical power consumption or output of more than 20 MVA, preferably more than 50 MVA.
  • the stator of a large electrical machine usually has a ferromagnetic and electrically conductive carrier body and electrical conductors which are wound around the carrier body as winding elements.
  • the conductors have at least one electrically highly conductive metal wire or metal rod, in particular a large number of such metal rods, and are surrounded by an insulating sleeve which is enveloped by an electrically semiconductive protective layer.
  • the insulating sleeve of a winding element usually consists of a mica-containing material to be impregnated or impregnated with a filler.
  • the filler is a synthetic resin, preferably a thermosetting epoxy resin system, for example a thermosetting mixture of an epoxy resin and an acid anhydrite.
  • Winding elements can be winding bars with rod-shaped base bodies, in particular approximately straight base bodies with bent ends, and also form coils with base bodies made of wound wires. Winding bars are usually used in dynamo-electric machines of very high performance, for example in turbogenerators. Form coils are preferred for use in low-power dynamo-electric machines.
  • the so-called all-soaking process is used, among other things.
  • the winding elements receive their filler impregnation only after installation in the corresponding carrier body. With the whole impregnation method, precise shaping of the winding elements by pressing or the like is largely superfluous.
  • the grooves containing the winding elements are essentially completely filled with the filler in the carrier body, so that the winding elements are largely immovably fixed in the grooves of the carrier body without further blocking measures.
  • the whole impregnation process gives the component consisting of carrier body and winding elements a unified surface.
  • GB-PS 910,297 describes a method for producing a protective coating for electrical wires made of resin, in which these wires are connected to a solid unit by means of the resin.
  • Applications here are the wire windings for the rotor and stator of an electrical machine; An epoxy powder resin is used for the coating, the electric wire winding itself being used as resistance heating when applied.
  • the powder resin is cured by heating in a curing oven, the powder resin accumulating in a temperature range between 120 ° and 230 ° and curing in a temperature range between 150 ° and 175 °.
  • the coating of the wire windings with powder resin is preferred to a soaking in liquid resin, since this soaking is disadvantageous for various reasons.
  • the protective layer here consists of an epoxy resin that is applied as a coating powder.
  • Protective layer made of the coating powder can be applied to a liquid resin impregnation and serve as mechanical protection against abrasion and as protection against moisture and thus against corrosion.
  • the powder coating has a thickness between 80 ⁇ m and 300 ⁇ m.
  • the electrical components to be coated are preheated to a temperature of between 100.degree. C. and 300.degree. C., the wire windings being operated as resistance heating.
  • the powder coating is carried out by spraying using nozzles, the grain size of the powder being at least 60% below 125 ⁇ m.
  • a powder coating based on bisphenol-A epoxy resin can be used as the coating powder.
  • the object of the invention is to provide a stator for a large dynamo-electric machine with an environmentally compatible, in particular ⁇ olation layer that can be produced without a solvent.
  • Another object of the invention is to provide a method for isolating and impregnating a stator of a large electrical machine.
  • the object directed to a stator is achieved by an insulation layer which consists of a hoarded powder paint.
  • the stator has a hollow cylindrical carrier body which extends along a longitudinal axis and which has grooves on the inner ring facing the longitudinal axis. These grooves are each directed along the longitudinal axis and each take up at least one, preferably two, electrical conductors.
  • the carrier body can consist of circular ring segments stacked on top of one another, for example made of dynamo sheets.
  • the carrier body or the circular ring segments are in particular ferromagnetic and electrically conductive.
  • the electrical conductors are rod-shaped or ribbon-shaped as winding elements, the conductors partially protruding from the carrier body in the so-called winding head. This winding head is also preferably coated with an insulation layer made of a powder coating.
  • An insulation layer made of a hardened powder lacquer distinguishes itself from an insulation layer made of a conventional wet lacquer, which contains about 50% solvent when applied before drying and is applied as a room temperature-curing two-component lacquer in a two-coat process, especially in that
  • the powder coating contains no solvents
  • a high heat class is achieved, for example heat class F or H, i.e. a heat resistance of 155 ° C or 180 ° C, • a higher tracking resistance is achieved,
  • a second complete impregnation is also possible through an insulation layer with a powder coating, for example in the course of a repair, since the insulation layer made of powder coating is resistant to the impregnating resin used in the complete impregnation process.
  • a wet paint With a wet paint, however, there is a risk that ⁇ ich dissolves in the impregnating resin.
  • the insulation layer brings about a homogenization of the surface, protection against corrosion, an increase in the tracking resistance and an improvement in the resistance to glow.
  • the insulation layer preferably has mica, as a result of which the insulation capacity can be increased and specifically adjusted.
  • the mica can, for example, be mixed with the powder coating in powder form.
  • the mica can optionally also be split mica, i.e. in fine-leaf form, during the coating process.
  • the insulation layer preferably has an epoxy resin, in particular based on bisphenol-A.
  • a powder coating with such an epoxy resin has the advantage that it can be fully cured at a low baking temperature of approx. 140 ° C.
  • As hardeners this is the case, as in the article "Epoxy resin powder coatings with low stoving temperature” by H.F. Lauterbach in the specialist brochure on surface technology, edition 1983, “Da ⁇ electrostatic powder coating in development and application", publisher F. Ebert,technik + Medunikation ⁇ verlag ⁇ GmbH, Berlin, described, phenolic ("NT”) hardener into consideration.
  • NT phenolic
  • the stator is preferably completely coated with the insulation layer on the inner circumference of the carrier body, in the winding head region of the conductors protruding from the carrier body and / or on the outer circumference, so that a closed surface to achieve high corrosion protection, high creep resistance and high glow resistance is reached. This is particularly advantageous in the winding head area. Through a complete covering with the insulation layer soiling can be easily removed, for example by lubricating oil.
  • the insulation layer is preferably applied to an impregnation layer which contains an impregnating resin.
  • an impregnating resin for example an epoxy resin
  • the grooves are completely filled, so that a largely smooth surface is formed on the inner circumference of the carrier body from the impregnation layer.
  • the electrical conductors or pairs of electrical conductors are wrapped with a band containing mica, which is impregnated with the impregnating resin.
  • the conductors protrude out of the carrier body in a winding head region and are spaced apart there at least in regions, so that they are each individually surrounded by the insulation layer.
  • the insulation layer preferably has a layer thickness of 40 ⁇ m to 200 ⁇ m. This achieves effective protection against corrosion and high creep resistance. In this way, a largely homogeneous surface is achieved on the component.
  • the object directed to a method for impregnating and isolating a component of an electrical machine is achieved according to the invention in that the stator is impregnated with a hollow-cylindrical support body which extends along a longitudinal axis in a complete impregnation with an impregnating resin and then at a temperature of 20 ° C to 70 ° C is coated with a powder coating.
  • the carrier body has grooves on the inner circumference facing the longitudinal axis, which are recessed radially outward and directed along the longitudinal axis, each groove receiving at least one electrical conductor.
  • the complete impregnation can be carried out in the so-called vacuum pressure impregnation process (VPI).
  • the stator is placed in an impregnation system introduced into a closed container, into which container the impregnating resin is introduced.
  • the impregnating resin is pressed into depressions of the stator under a pressure of about 4 bar.
  • the stator is cooled.
  • the stator is preferably kept at a temperature of 50 ° C. during coating with the powder coating.
  • cooling to 50 ° C. can take place immediately after the impregnation process has been carried out, or the stator can be cooled to a lower temperature and heated to 50 ° C. at a later point in time. At a temperature of 50 ° C, better adhesion of the powder coating is achieved compared to room temperature.
  • a powder coating is preferably used which cures at a temperature from 120 ° C. to 200 ° C., in particular 140 ° C.
  • the stator is heated to a corresponding temperature, for example up to 140 ° C., and is kept at this temperature for the duration required for curing the powder coating, for example 10 minutes to 20 minutes ⁇ th.
  • EPS electrostatic powder spray
  • the electrostatic fluidized-bed method and an electrostatic fluidized-bed coating, as described, for example, in the book “Manufacturing Processes in Device Technology”. Grünwald, 2nd edition, Carl Hanser Verlag Kunststoff, 1985, Section 9.5.2.4, or in the book “Introduction to Manufacturing Technology” by H.-J. Warnecke, Teubner Verlag Stuttgart, 1990, Chapter 6, Section 6.2, are described.
  • electrostatic powder spraying EPS process
  • the powder is applied using so-called corona spraying pistols or tribo-pistols. In both cases, excess powder coating not adhering to the component can be recovered and thus reused.
  • Epoxy resin powders with curing times of 15 minutes to 5 minutes at temperatures of 140 ° C. or 210 ° C. are particularly suitable as powder coatings. With these epoxy resin powders are very good good mechanical and chemical layer properties achieved.
  • Other powder coatings include polyurethane powder coatings, polyester powder coatings and acrylic resin powder coatings. Compared to common paints, such as wet paints, these powder paints have the advantage that the hardening mechanism has to be created by polyaddition and is therefore environmentally friendly. A very high utilization of up to 99% is possible. After hardening and cooling, a single-layer coating is present with a uniform insulation layer thickness in the range between 40 ⁇ m and 200 ⁇ m as well as a high hardness and resistance of the insulation layer.
  • the powder coating preferably has a powder grain size of 30 ⁇ m to 100 ⁇ m.
  • the powder grain size is predominantly smaller than 70 ⁇ m, for example approximately 66% of the powder grains have a powder grain size of more than 32 ⁇ m, approximately 15% of more than 63 ⁇ m and approximately 2% of more than 90 ⁇ m.
  • FIG. 1 shows a longitudinal section of a turbogenerator, partly in a side view
  • FIG. 2 shows a cross section through the stator of a turbogenerator.
  • the turbogenerator 15 has a stator housing 12 in which A generator rotor 9 is mounted on and between two bearings 10.
  • the generator rotor 9 is directed along a longitudinal axis 7 and is rotationally symmetrical with respect to this.
  • the rotor 9 is also enclosed by a stator 1 directed along the main axis 7.
  • the stator 1 has a hollow cylindrical support body 17 which has a plurality of circular ring segments 2 arranged one behind the other in the direction of the longitudinal axis 7 and made of ferromagnetic and electrically conductive dynamo sheets.
  • the carrier body 17 has grooves 6 running on its inner circumference 8 along the longitudinal axis 7
  • a conductor bar 3 is guided in each of the grooves 6 (see FIG. 2).
  • the conductor bars 3 are formed on the ends of the carrier body 17 facing the bearings 10 to form respective winding heads 16.
  • An exciter 11 is connected to a bearing 10 on the rotor 9.
  • the stator 1 has a longitudinal extension in the direction of the longitudinal axis 7 which is significantly larger than its diameter. Accordingly, the conductors 3 are also oriented essentially in the longitudinal direction.
  • the cross section of the stator 1 is a circular ring 2 which is, for example, a dynamo sheet made of ferromagnetic and electrically conductive material.
  • Grooves 6 are arranged on the inner circumference 8 of the stator 1 and are directed along the longitudinal axis 7 (see FIG. 1). The grooves 6 are cut radially away from the longitudinal axis 7 into the metal sheets.
  • a conductor rod 3 is arranged in each groove 6, which consists, for example, of two copper rod packs which are separate from one another.
  • An insulation layer 13 is made of this by a coating a hardened powder coating 5, in particular an epoxy resin based on bisphenol-A, is applied.
  • the insulation layer 13 from the powder coating 5 has a heat resistance of 155 ° C. to 180 ° C., which corresponds to a heat class F or H.
  • the invention is characterized by the application of an insulation layer made of a hardenable powder coating on a stator of a turbogenerator.
  • the stator receives an insulation layer which, compared to insulation layers made of a two-component wet coating, guarantees a significantly improved tracking resistance and a higher heat resistance.
  • the stator receives an insulation layer which, compared to insulation layers made of a two-component wet coating, guarantees a significantly improved tracking resistance and a higher heat resistance.
  • the insulation layer is very environmentally friendly, since no solvents are used and the powder coating can be used to almost 99%.
  • the insulation layer is particularly suitable for a stator with a carrier body and winding elements, which are impregnated together in a complete impregnation process.

Landscapes

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

Abstract

Ce stator (1) d'une machine électrique (15), notamment un turbo-alternateur, comprend une couche d'isolation (13) en peinture en poudre (5). L'invention concerne également un procédé d'imprégnation et d'isolation du stator (1) d'une machine électrique (15). Le stator (1) est entièrement imprégné d'une résine d'imprégnation (4), puis revêtu d'une peinture en poudre (5) à une température comprise entre 20 °C et 70 °C. La couche d'isolation (13) ainsi obtenue atteint même avec une seule application une résistance à la chaleur et aux courants de fuite plus élevée que par les procédés de mise en peinture par voie humide. La peinture en poudre (5) contient de préférence une résine époxy à base de bisphénol-A. Comme la peinture en poudre (5) ne contient pas de solvants et est utilisée jusqu'à 99 %, la couche d'isolation (13) peut être produite d'une manière particulièrement compatible avec l'environnement.
PCT/DE1996/001489 1995-08-21 1996-08-08 Stator de machine electrique et procede d'impregnation et d'isolation du stator d'une machine electrique Ceased WO1997007585A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19530672 1995-08-21
DE19530672.4 1995-08-21

Publications (2)

Publication Number Publication Date
WO1997007585A2 true WO1997007585A2 (fr) 1997-02-27
WO1997007585A3 WO1997007585A3 (fr) 1997-03-20

Family

ID=7769978

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/001489 Ceased WO1997007585A2 (fr) 1995-08-21 1996-08-08 Stator de machine electrique et procede d'impregnation et d'isolation du stator d'une machine electrique

Country Status (1)

Country Link
WO (1) WO1997007585A2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998048501A1 (fr) * 1997-04-22 1998-10-29 Siemens Ltda. Procede pour appliquer une isolation aux spires d'une bobine d'un pole d'une machine synchrone, et bobine du pole
WO2006108817A1 (fr) * 2005-04-13 2006-10-19 Siemens Aktiengesellschaft Procede de revetement d'une tete d'enroulement d'un moteur electrique
US7572488B2 (en) 2003-07-22 2009-08-11 Robert Bosch Gmbh Method for applying an electrical insulation
DE102008033762A1 (de) * 2008-07-18 2010-01-21 Siemens Aktiengesellschaft Verfahren und Anlage zum Fertigen einer Wicklungsanordnung
WO2016034174A1 (fr) * 2014-09-05 2016-03-10 Schaeffler Technologies AG & Co. KG Palier à roulement pourvu d'un circuit électrique et procédé de fabrication d'un circuit électrique pour un palier à roulement

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5839252A (ja) * 1981-09-02 1983-03-07 Mitsubishi Electric Corp 回転機コイルの絶縁処理方法
DE3528492A1 (de) * 1985-08-08 1987-02-12 Resicoat Gmbh Verfahren zum schuetzen von elektrischen bauteilen
JPS633067A (ja) * 1986-06-24 1988-01-08 Somar Corp 粉体塗料組成物
JPS63265532A (ja) * 1987-04-22 1988-11-02 Mitsubishi Electric Corp 車両用交流発電機のステ−タコア
JPH01135878A (ja) * 1987-11-20 1989-05-29 Sumitomo Bakelite Co Ltd 電気絶縁用エポキシ樹脂粉体塗料組成物
JPH03226249A (ja) * 1989-12-12 1991-10-07 Toshiba Corp 誘導機器の製造方法

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998048501A1 (fr) * 1997-04-22 1998-10-29 Siemens Ltda. Procede pour appliquer une isolation aux spires d'une bobine d'un pole d'une machine synchrone, et bobine du pole
US7572488B2 (en) 2003-07-22 2009-08-11 Robert Bosch Gmbh Method for applying an electrical insulation
WO2006108817A1 (fr) * 2005-04-13 2006-10-19 Siemens Aktiengesellschaft Procede de revetement d'une tete d'enroulement d'un moteur electrique
US7670653B2 (en) 2005-04-13 2010-03-02 Siemens Aktiengesellschaft Coating method for an end winding of an electric machine
DE102008033762A1 (de) * 2008-07-18 2010-01-21 Siemens Aktiengesellschaft Verfahren und Anlage zum Fertigen einer Wicklungsanordnung
WO2016034174A1 (fr) * 2014-09-05 2016-03-10 Schaeffler Technologies AG & Co. KG Palier à roulement pourvu d'un circuit électrique et procédé de fabrication d'un circuit électrique pour un palier à roulement
CN106605071A (zh) * 2014-09-05 2017-04-26 舍弗勒技术股份两合公司 具有电路的滚动轴承以及用于滚动轴承的电路的制造方法
US10077809B2 (en) 2014-09-05 2018-09-18 Schaeffler Technologies AG & Co. KG Rolling bearing comprising an electric circuit, and method for producing an electric circuit for a rolling bearing
CN106605071B (zh) * 2014-09-05 2019-01-15 舍弗勒技术股份两合公司 具有电路的滚动轴承以及用于滚动轴承的电路的制造方法

Also Published As

Publication number Publication date
WO1997007585A3 (fr) 1997-03-20

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