WO2004057728A1 - Air-gap winding for an electrical machine - Google Patents

Air-gap winding for an electrical machine Download PDF

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Publication number
WO2004057728A1
WO2004057728A1 PCT/DE2003/004034 DE0304034W WO2004057728A1 WO 2004057728 A1 WO2004057728 A1 WO 2004057728A1 DE 0304034 W DE0304034 W DE 0304034W WO 2004057728 A1 WO2004057728 A1 WO 2004057728A1
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WO
WIPO (PCT)
Prior art keywords
winding
electrical machine
air gap
gap winding
stranded
Prior art date
Application number
PCT/DE2003/004034
Other languages
German (de)
French (fr)
Inventor
Klaus Schäfer
Gerhard Dressel
Martin Kaufhold
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2004057728A1 publication Critical patent/WO2004057728A1/en

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/46Fastening of windings on the stator or rotor structure
    • H02K3/47Air-gap windings, i.e. iron-free windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/12Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • H02K3/14Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots with transposed conductors, e.g. twisted conductors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K55/00Dynamo-electric machines having windings operating at cryogenic temperatures
    • H02K55/02Dynamo-electric machines having windings operating at cryogenic temperatures of the synchronous type
    • H02K55/04Dynamo-electric machines having windings operating at cryogenic temperatures of the synchronous type with rotating field windings
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Definitions

  • the invention relates to an electrical machine with a
  • the superconductivity effect has been known for a long time.
  • the electrical resistance of certain materials disappears below a so-called crack temperature.
  • temperatures had to be reached just above absolute zero, which is minus 273 ° C, which are generated with the help of liquid helium.
  • temperatures of liquid nitrogen are already sufficient to achieve this effect produce.
  • the actual superconducting material is very thin filaments of a ceramic, which are embedded in a silver matrix in order to obtain a useful strip conductor that can be wound into coils.
  • the superconductor only tolerates very small alternating fields, due to the resulting losses in the conductor, it would lose its superconductivity, so it cannot currently be used in the stator operated with alternating current, but only in the excitation winding rotating with direct current supply (HTSL machines).
  • This technology achieves magnetic air field strengths in the air gap of two tesla and more. With conventional technology, this would mean that the stator teeth of an electrical machine would become very saturated.
  • the resulting characteristic characteristic of synchronous machines, known as synchronous reactance is only 10-20% of a conventional electrical machine.
  • DE 30 03 483 AI and DE 21 65 678 AI holding devices for air gap windings in such electrical machines are known.
  • the coils of the previous air gap windings are made of round wire or shaped coils of rectangular wires, which consist of flat profile conductors that are solid.
  • the disadvantage here is that the existing winding space cannot be used optimally and the geometric shape, in particular of the winding head, is very limited.
  • the invention is therefore based on the object of providing an air gap winding for HTSL machines which avoids the disadvantages mentioned above.
  • the stranded conductors consist of individual filaments which are twisted, choked or guided in parallel within the stranded conductor. Both the stranded conductor and the individual filaments can have different cross sections, for example square, triangular and rounded. Even greater flexibility is achieved by “mixing” individual different filaments within a stranded conductor.
  • the stranded conductors are not only flexible but also deformable in their cross-section over their length and can therefore be adapted to any contour. If several stranded conductors are used, they can also be twisted, choked or laid in parallel.
  • Both the stranded conductors and the filaments can have artificially applied insulation layers.
  • the inventive use of the stranded conductors, in particular the flat stranded conductors in air gap windings, means that the design options in the winding design, in particular in the end winding, are very much larger, so that shapes or elements can be inserted there which contribute to the heat dissipation of the end winding.
  • the overall reduced losses in both the “yoke area” and the winding head are advantageous when used in a superconducting excited machine (HTSL machine), since the large temperature difference between the rotor and the stator can be reduced here.
  • the area of the stator winding relevant for torque formation can be extended to the winding head area in the case of air gap windings, since the flow guidance through the stator iron is eliminated.
  • FIG 3 and FIG 4 versions with strand technology; 5 construction of a stranded conductor.
  • FIG. 1 shows the basic illustration of a winding head 1 of a stator 2, not shown, which is formed by flat copper conductor 3.
  • FIG. 2 shows the winding head 1 with the flat copper conductors 3 in another representation. Also striking in this representation is the extreme axial extension of the winding head 1 and the complex geometric design.
  • FIG. 3 accordingly shows a winding head 1 designed by stranded conductors 4, in particular flat stranded conductors, in which the winding system, i.e. the air gap winding is formed by stranded wire 4.
  • the flexible stranded conductor 4 makes it possible in particular to reduce the unloading of the winding head 1 and thus to optimize the overall size of the entire HTSL machine.
  • the stranded conductor 4 is formed by individual filaments 5, which are surrounded by an insulation layer 6.
  • the insulation layer may have been applied artificially or may have been formed as an oxide layer.
  • the filaments 5 have a round cross-section of the same size. However, it is also possible to combine different filaments 5 with one another in terms of cross section and diameter within a stranded conductor 4.
  • the cavity between the filaments 5 is not filled in this example. However, it can contain filling compounds which are preferably elastic so as not to impair the flexibility of the stranded conductor 4.
  • the stranded conductor 4 is preferably surrounded by an elastic insulation layer 7.
  • cooling channel-forming elements 8 are shown in principle between the filaments 5. It is understood that the number and nature of such elements 8 can be adapted to the given conditions.
  • Such cooling channel-forming elements 8 are also present within the winding head, and they simultaneously function as spacer or support elements.

Abstract

In order to be able to better utilize the winding space of an electrical machine with an air-gap winding, the invention provides that the air-gap winding is formed by bunched conductors (4).

Description

Beschreibungdescription
UFTSPALTWICKLUNG FÜR EINE ELEKTRISCHE MASCHINEGAP WINDING FOR AN ELECTRICAL MACHINE
Die Erfindung betrifft eine elektrische Maschine mit einemThe invention relates to an electrical machine with a
Ständer und einem hochtemperatursupraleitenden Läufer mit einer Luftspaltwicklung im Ständer und einer geeigneten Vorrichtung zur Fixierung der Luftspaltwicklung am Ständer.Stand and a high-temperature superconducting rotor with an air gap winding in the stator and a suitable device for fixing the air gap winding on the stator.
Der Supraleitungseffekt ist seit längerem bekannt. Unterhalb einer sogenannten Sprungtemperatur verschwindet der elektrische Widerstand bestimmter Materialien. Mussten vor einigen Jahren noch Temperaturen knapp über dem absoluten Nullpunkt erreicht werden, der bei Minus 273 °C liegt, die mit Hilfe von flüssigem Helium erzeugt werden, so genügen bei "Hochtemperatursupraleitern" bereits Temperaturen des flüssigen Stickstoffs (77 Kelvin) um diesen Effekt zu erzeugen. Das eigentliche Supraleitungsmaterial sind sehr dünne Filamente einer Keramik, die in einer Silbermatrix eingebettet werden, um ei- nen brauchbaren Bandleiter zu erhalten, der zu Spulen gewickelt werden kann.The superconductivity effect has been known for a long time. The electrical resistance of certain materials disappears below a so-called crack temperature. A few years ago, temperatures had to be reached just above absolute zero, which is minus 273 ° C, which are generated with the help of liquid helium. For high-temperature superconductors, temperatures of liquid nitrogen (77 Kelvin) are already sufficient to achieve this effect produce. The actual superconducting material is very thin filaments of a ceramic, which are embedded in a silver matrix in order to obtain a useful strip conductor that can be wound into coils.
Der Supraleiter verträgt nur sehr kleine Wechselfelder, durch die im Leiter dadurch entstehenden Verluste würde er seine Supraleitfähigkeit verlieren, somit ist er derzeit nicht im mit Wechselstrom zu betreibenden Ständer einsetzbar, sondern ausschließlich in der mit Gleichstromversorgung rotierenden Erregerwicklung (HTSL-Maschinen) . Durch diese Technologie werden magnetische Luftfeldstärken im Luftspalt von zwei Tes- la und mehr erreicht. Dies hätte bei konventioneller Technik zufolge, dass die Ständerzähne einer elektrischen Maschine sehr stark gesättigt werden würden. Die daraus folgende .charakteristische Kenngröße der Synchronmaschinen sogenannte synchrone Reaktanz ist hier nur zu 10-20% einer herkömmlichen elektrischen Maschine. Aus der DE 30 03 483 AI und DE 21 65 678 AI sind Haltevorrichtungen für Luftspaltwicklungen in derartigen elektrischen Maschinen bekannt. Die Spulen der bisherigen Luftspaltwicklungen werden aus Runddraht oder Formspulen aus Rechteckdrähten verwendet, die aus Flachprofilleitern die massiv ausgeführt sind, bestehen. Nachteilig dabei ist, dass der vorhandene Wickelraum nicht optimal ausgenutzt werden kann und die geometrische Formgebung, insbesondere des Wickelkopfes sehr eingeschränkt ist.The superconductor only tolerates very small alternating fields, due to the resulting losses in the conductor, it would lose its superconductivity, so it cannot currently be used in the stator operated with alternating current, but only in the excitation winding rotating with direct current supply (HTSL machines). This technology achieves magnetic air field strengths in the air gap of two tesla and more. With conventional technology, this would mean that the stator teeth of an electrical machine would become very saturated. The resulting characteristic characteristic of synchronous machines, known as synchronous reactance, is only 10-20% of a conventional electrical machine. DE 30 03 483 AI and DE 21 65 678 AI holding devices for air gap windings in such electrical machines are known. The coils of the previous air gap windings are made of round wire or shaped coils of rectangular wires, which consist of flat profile conductors that are solid. The disadvantage here is that the existing winding space cannot be used optimally and the geometric shape, in particular of the winding head, is very limited.
Der Erfindung liegt demnach die Aufgabe zugrunde, eine Luft- spaltwicklung für HTSL-Maschinen zu schaffen, die die oben genannten Nachteile vermeidet .The invention is therefore based on the object of providing an air gap winding for HTSL machines which avoids the disadvantages mentioned above.
Die Lösung der gestellten Aufgabe gelingt durch eine elektrische Maschine nach Anspruch 1.The problem is solved by an electrical machine according to claim 1.
Durch Verwendung eines Litzenleiters wird insbesondere im Bereich der Wickelköpfe eine freie geometrische Gestaltung durch die hohe Flexibilität der Litzenleiter ermöglicht. Damit wird zum einen ein kleineres Bauvolumen der Wickelköpfe mit dementsprechend geringerer Verlustleistung und zum anderen eine einfache Integration aktiver Kühlelemente, z.B. kühlkanalbildenden Elementen, Schläuchen oder Heatpipes er- möglicht.By using a stranded conductor, a free geometric design is made possible in particular in the area of the winding overhangs due to the high flexibility of the stranded conductor. On the one hand, this results in a smaller construction volume of the winding heads with a correspondingly lower power loss and, on the other hand, a simple integration of active cooling elements, e.g. elements, hoses or heat pipes that form cooling channels.
Die Litzenleiter bestehen aus einzelnen Filamenten, die innerhalb des Litzenleiters verdrillt, verwürgt oder parallel geführt sind. Sowohl der Litzenleiter als auch die einzelnen Filamente können unterschiedliche Querschnitte aufweisen, z.B. viereckig, dreieckig und rundlich. Eine noch höhere Flexibilität wird durch „Mischung" einzelner unterschiedlicher Filamente innerhalb eines Litzenleiters erreicht. Die Litzeleiter sind damit nicht nur flexibel sondern auch über ihre Länge in ihrem Querschnitt verformbar und somit jeder Kontur anpassbar. Bei Verwendung mehrerer Litzenleiter können diese ebenso verdrillt, verwürgt oder parallel verlegt sein.The stranded conductors consist of individual filaments which are twisted, choked or guided in parallel within the stranded conductor. Both the stranded conductor and the individual filaments can have different cross sections, for example square, triangular and rounded. Even greater flexibility is achieved by “mixing” individual different filaments within a stranded conductor. The stranded conductors are not only flexible but also deformable in their cross-section over their length and can therefore be adapted to any contour. If several stranded conductors are used, they can also be twisted, choked or laid in parallel.
Sowohl die Litzenleiter als auch die Filamente können künst- lieh aufgebrachte Isolationsschichten aufweisen.Both the stranded conductors and the filaments can have artificially applied insulation layers.
Durch die Flexibilität der Litzenleiter besteht die Möglichkeit der Verdrillung der Litzenleiter im Jochbereich und im Wickelkopfbereich, so dass die Stromverdrängung reduziert wird. Die Oberfläche dieser Litzenleiter ist erheblich größer als die Oberfläche der bisher bekannten Drahtleiter. Dies bedeutet, dass bei steigender Betriebsfrequenz die Widerstandserhöhung infolge des Skineffekts unterdrückt wird und die Wirbelstromverluste auf ein Minimum reduziert werden.Due to the flexibility of the stranded wire, there is the possibility of twisting the stranded wire in the yoke area and in the end winding area, so that the current displacement is reduced. The surface of these stranded conductors is considerably larger than the surface of the previously known wire conductors. This means that as the operating frequency increases, the increase in resistance due to the skin effect is suppressed and the eddy current losses are reduced to a minimum.
Durch die erfindungsgemäße Anwendung der Litzenleiter insbesondere der Flachlitzenleiter bei Luftspaltwicklungen, sind die Gestaltungsmöglichkeiten im Wicklungsdesign, insbesondere im Wickelkopf sehr viel größer, so dass dort Formen bzw. Ele- mente eingefügt werden können, die zur Entwärmung des Wickel- köpfes beitragen.The inventive use of the stranded conductors, in particular the flat stranded conductors in air gap windings, means that the design options in the winding design, in particular in the end winding, are very much larger, so that shapes or elements can be inserted there which contribute to the heat dissipation of the end winding.
Die insgesamt verringerten Verluste sowohl im "Jochbereich" und Wickelkopf sind bei Anwendung in einer supraleitenden er- regten Maschine (HTSL-Maschine) vorteilhaft, da hier die große Temperaturdifferenz zwischen Läufer und Ständer verringert werden kann. Der für die Drehmomentbildung relevante Bereich der Ständerwicklung kann bei Luftspaltwicklungen auf den Wickelkopfbereich ausgedehnt werden, da die Flussführung durch das Ständereisen entfällt. Mit den erfindungsgemäßen Einsatz der Litzentechnologie ist es nunmehr möglich, diese Anteile der Wicklung hinsichtlich der Drehmomentbildung durch ange- . passte Konstruktion zu optimieren.The overall reduced losses in both the “yoke area” and the winding head are advantageous when used in a superconducting excited machine (HTSL machine), since the large temperature difference between the rotor and the stator can be reduced here. The area of the stator winding relevant for torque formation can be extended to the winding head area in the case of air gap windings, since the flow guidance through the stator iron is eliminated. With the use of stranded wire technology according to the invention, it is now possible to adapt these parts of the winding with regard to the torque formation. to optimize the appropriate construction.
Weitere Vorteile der Erfindung sind den Unteransprüchen zu entnehmen. Die Erfindung sowie weitere vorteilhafte Ausgestaltungen der Erfindung werden anhand eines schematisch dargestellten Beispiels in der Zeichnung näher erläutert, darin zeigen:Further advantages of the invention can be found in the subclaims. The invention and further advantageous embodiments of the invention are explained in more detail with reference to a schematically illustrated example in the drawing, in which:
FIG 1 und FIG 2 den Stand der Technik;1 and 2 show the prior art;
FIG 3 und FIG 4 Ausführungen mit Litzentechnologie; FIG 5 Aufbau eines Litzenleiters.FIG 3 and FIG 4 versions with strand technology; 5 construction of a stranded conductor.
FIG 1 zeigt die prinzipielle Darstellung eines Wickelkopfes 1 eines nicht näher dargestellten Ständers 2 der durch Flachkupferleiter 3 gebildet wird. Die unzureichende Flexibilität und die erschwerte Handhabung derartiger Flachleiter 3 führt zu einem verhältnismäßig weit ausladendem Wickelkopf 1.1 shows the basic illustration of a winding head 1 of a stator 2, not shown, which is formed by flat copper conductor 3. The insufficient flexibility and the difficult handling of such flat conductors 3 lead to a relatively wide protruding winding head 1.
FIG 2 zeigt in einer anderen Darstellung den Wickelkopf 1 mit den Flachkupferleitern 3. Auffallend ist auch in dieser Darstellung die extreme axiale Ausdehnung des Wickelkopfes 1 und die aufwendige geometrische Gestaltung.FIG. 2 shows the winding head 1 with the flat copper conductors 3 in another representation. Also striking in this representation is the extreme axial extension of the winding head 1 and the complex geometric design.
FIG 3 zeigt demzufolge einen durch Litzenleitern 4 insbesondere Flachlitzenleitern gestalteten Wickelkopf 1, bei dem das Wicklungssystem, d.h. die Luftspaltwicklung durch Litzenleiter 4 gebildet wird. Durch die flexiblen Litzenleiter 4 ist es insbesondere, wie in FIG 4 dargestellt, möglich die Ausla- düng des Wickelkopfes 1 zu verringern und damit die Baugröße der gesamten HTSL-Maschine zu optimieren.3 accordingly shows a winding head 1 designed by stranded conductors 4, in particular flat stranded conductors, in which the winding system, i.e. the air gap winding is formed by stranded wire 4. As shown in FIG. 4, the flexible stranded conductor 4 makes it possible in particular to reduce the unloading of the winding head 1 and thus to optimize the overall size of the entire HTSL machine.
FIG 5 zeigt beispielhaft den Aufbau eines Litzenleiters 4. Der Litzenleiter 4 wird durch einzelne Filamente 5 gebildet, die von einer Isolationsschicht 6 umgeben sind. Die Isolationsschicht kann künstlich aufgebracht worden sein, oder sich als eine Oxidschicht ausgebildet haben. Die Filamente 5 haben einen gleichgroßen, runden Querschnitt. Es ist aber genauso möglich unterschiedliche Filamente 5 hinsichtlich Querschnitt und Durchmesser miteinander innerhalb eines Litzenleiters 4 zu kombinieren. Der Hohlraum zwischen den Filamenten 5 ist in diesem Beispiel nicht gefüllt. Er kann aber Füllmassen enthalten, die vorzugsweise elastisch sind um die Flexibilität des Litzenleiters 4 nicht zu beeinträchtigen.5 shows an example of the structure of a stranded conductor 4. The stranded conductor 4 is formed by individual filaments 5, which are surrounded by an insulation layer 6. The insulation layer may have been applied artificially or may have been formed as an oxide layer. The filaments 5 have a round cross-section of the same size. However, it is also possible to combine different filaments 5 with one another in terms of cross section and diameter within a stranded conductor 4. The cavity between the filaments 5 is not filled in this example. However, it can contain filling compounds which are preferably elastic so as not to impair the flexibility of the stranded conductor 4.
Der Litzenleiter 4 ist vorzugsweise von einer elastischen I- solationsschicht 7 umgeben.The stranded conductor 4 is preferably surrounded by an elastic insulation layer 7.
Innerhalb eines Litzenleiters 4 sind zwischen den Filamenten 5 prinzipiell dargestellt kühlkanalbildende Elemente 8 vor- handen. Es versteht sich, dass solche Elemente 8 in ihrer Anzahl und Beschaffenheit den gegebenen Bedingungen anpassbar sind.Within a stranded conductor 4, cooling channel-forming elements 8 are shown in principle between the filaments 5. It is understood that the number and nature of such elements 8 can be adapted to the given conditions.
Auch innerhalb des Wickelkopfes sind derartige kühlkanalbil- dende Elemente 8 vorhanden, sie fungieren gleichzeitig als Distanz- oder Stützelemente. Such cooling channel-forming elements 8 are also present within the winding head, and they simultaneously function as spacer or support elements.

Claims

Patentansprüche claims
1. Elektrische Maschine mit einem Ständer (2) und einem hoch- temperatursupraleitenden Läufer mit einer Luftspaltwicklung im Ständer und einer geeigneten Vorrichtung zur Fixierung der Luftspaltwicklung im Joch im Ständer, d a d u r c h g e k e n n z e i c h n e t , dass die Luftspaltwicklung aus Litzenleitern (4) aufgebaut ist.1. Electrical machine with a stator (2) and a high-temperature superconducting rotor with an air gap winding in the stator and a suitable device for fixing the air gap winding in the yoke in the stator, so that the air gap winding is made up of stranded conductors (4).
2. Elektrische Maschine nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , dass die Luftspaltwicklung aus Rechteckleitern aus Flachlitze aufgebaut ist.2. Electrical machine according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the air gap winding is constructed from rectangular conductors made of flat wire.
3. Elektrische Maschine nach Anspruch 1 oder 2, d a - d u r c h g e k e n n z e i c h n e t , dass die Luftspaltwicklung zumindest ein Kühlsystem aufweist.3. Electrical machine according to claim 1 or 2, d a - d u r c h g e k e n e z e i c h n e t that the air gap winding has at least one cooling system.
4. Elektrische Maschine nach Anspruch 3, d a d u r c h g e k e n n z e i c h n e t , dass die Luftspaltwicklung kühlkanalbildende Elemente (8) aufweist.4. Electrical machine according to claim 3, d a d u r c h g e k e n n z e i c h n e t that the air gap winding has cooling channel-forming elements (8).
5. Elektrische Maschine nach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t , dass die kühlkanalbildenden Elemente (8) die Luftspaltwicklung umgeben und/oder enthalten sind.5. Electrical machine according to claim 4, so that the cooling channel-forming elements (8) surround and / or are contained in the air gap winding.
6. Elektrische Maschine nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass u.a. eine Verdrillung der Filamente (5) der Litzenleiter (4), insbesondere der Flachlitzenleiter im Bereich des Jochs und/oder des Wicklungskopfes (1) stattfindet. 6. Electrical machine according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that u.a. the filaments (5) of the stranded conductors (4), in particular the flat stranded conductors, are twisted in the area of the yoke and / or the winding head (1).
PCT/DE2003/004034 2002-12-20 2003-12-08 Air-gap winding for an electrical machine WO2004057728A1 (en)

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DE10260281.6 2002-12-20
DE10260281A DE10260281A1 (en) 2002-12-20 2002-12-20 Electrical machine

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EP1523084A1 (en) * 2003-10-09 2005-04-13 General Electric Company Flexible stator bars

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US3014139A (en) * 1959-10-27 1961-12-19 Gen Electric Direct-cooled cable winding for electro magnetic device
US3963950A (en) * 1973-10-17 1976-06-15 Hitachi, Ltd. Stator of rotary electric machine
US4137471A (en) * 1975-12-25 1979-01-30 Hitachi, Ltd. Stator winding structure for gap winding type electric rotary machine
US4337567A (en) * 1978-09-27 1982-07-06 Westinghouse Electric Corp. Method of making a conductor bar for dynamoelectric machines

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DE1815904A1 (en) * 1968-12-20 1970-07-16 Siemens Ag Synchronous generator, especially turbo generator, with rotating superconducting excitation winding
DE3241506A1 (en) * 1982-11-10 1984-05-10 Leningradskoe proizvodstvennoe elektromašinostroitel'noe obedinenie "Elektrosila" imeni S.M. Kirova, Leningrad Winding bar of the stator of an electrical machine having a core which is designed without slots
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US3014139A (en) * 1959-10-27 1961-12-19 Gen Electric Direct-cooled cable winding for electro magnetic device
US3963950A (en) * 1973-10-17 1976-06-15 Hitachi, Ltd. Stator of rotary electric machine
US4137471A (en) * 1975-12-25 1979-01-30 Hitachi, Ltd. Stator winding structure for gap winding type electric rotary machine
US4337567A (en) * 1978-09-27 1982-07-06 Westinghouse Electric Corp. Method of making a conductor bar for dynamoelectric machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1523084A1 (en) * 2003-10-09 2005-04-13 General Electric Company Flexible stator bars

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