EP2422430A1 - Electric machine with a restraint system for the rotor winding head - Google Patents
Electric machine with a restraint system for the rotor winding headInfo
- Publication number
- EP2422430A1 EP2422430A1 EP10715793A EP10715793A EP2422430A1 EP 2422430 A1 EP2422430 A1 EP 2422430A1 EP 10715793 A EP10715793 A EP 10715793A EP 10715793 A EP10715793 A EP 10715793A EP 2422430 A1 EP2422430 A1 EP 2422430A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- winding head
- retaining elements
- electrical machine
- rotor
- restraint system
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
- H02K3/51—Fastening of winding heads, equalising connectors, or connections thereto applicable to rotors only
Definitions
- the present invention relates to the field of electric machines. It relates to an electrical machine according to the preamble of claim 1.
- Double-fed asynchronous machines in the power range from 20 MVA to 500 MVA can be used for variable-speed energy production. These machines are characterized by a distributed three-phase winding on the rotor.
- the rotor winding consists of individual rods, which are embedded in grooves in the rotor core. In the winding head, the individual rods are connected to form a winding. The arrangement of the rod connections is evenly distributed around the circumference.
- the winding heads are exposed to centrifugal forces, against which they must be mechanically secured by means of winding head restraint systems.
- three types of winding head restraint systems are known today: 1. Attachment by means of a steel cap, as is the case with turbogenerators.
- such an asynchronous machine 10 is shown in fragmentary form in a greatly simplified form. It comprises a rotatable about an axis 18 rotor 19 which is concentrically surrounded by a stator lamination 14 with a corresponding stator winding and a stator winding 17.
- the rotor 19 comprises a central body 11, which merges at the ends in each case in a shaft 11 '.
- the central body 11 is enclosed by a rotor laminated body 12, in which the rotor winding 13 extends.
- On one of the shafts 11 'slip rings 15 are arranged, which serve to supply the rotor winding 13 with power.
- the rotor winding head 16 which is shown enlarged again in a vertical orientation in FIG.
- FIG. 2 (a) is equipped with a winding head restraint system 29 which, according to FIG. 2 (a), has retaining elements in the form of nuts 21 extending radially through the rotor winding head 16 provided threaded rods 20 or bolts or the like. Equipped.
- the retaining elements 20, 21 catch the centrifugal forces acting on the rotor winding head 16 during operation of the machine and introduce them into the massive part of the rotor arranged below the winding head. It can now happen during operation over a long period of time that the mechanically heavily loaded retaining elements 20, 21 break or otherwise lose their mechanical integrity. But it may also be that the nuts 21 or Versch robberies solve and the function of the retaining elements 20, 21 is lost in this way. Solves in the context of this failure Part of the retaining elements 20, 21 and is thrown to the outside, consequential damage to the machine can occur, leading to a prolonged failure of the machine and thus high follow-up costs.
- the object is solved by the entirety of the features of claim 1.
- the retaining elements are provided with securing means which secure the retaining elements against accidental loosening and / or flying away in the event of breakage.
- Retaining elements as in the radial direction through the winding head extending through threaded rods or bolts are formed, which are provided at the outer end with a nut or a screw head for supporting the winding head.
- the securing means may comprise a fabric securing, which, in particular in the form of a fabric band, preferably tight-fitting and in the circumferential direction, is stretched over the outsides of the nuts or screw heads.
- the securing means may also comprise a wire lock, which is in the form of a wire, preferably tight-fitting and in the circumferential direction, stretched over the outer sides of the nuts and / or threaded rods or screw heads.
- a wire lock which is in the form of a wire, preferably tight-fitting and in the circumferential direction, stretched over the outer sides of the nuts and / or threaded rods or screw heads.
- slots are preferably provided on the retaining elements, in which the wire lock is inserted, which simultaneously secures the retaining elements against rotation.
- Another embodiment of the invention is characterized in that the winding head restraint system is equipped with monitoring means with which the proper function of the winding head can be monitored.
- the monitoring means preferably comprise voltage measuring devices, which measure the mechanical tension of the securing means in the winding head restraint system and pass it on to an evaluation unit for evaluation.
- Fig. 1 in a highly simplified representation of a section of an asynchronous machine with stator and rotor winding and a
- Rotor winding head of Figure 1 in a vertical orientation (Fig. 2a) and two types of fuses for the retaining elements according to various embodiments of the invention
- FIG. 4 shows the exemplary installation of monitoring means in the restraint system according to another embodiment of the invention.
- Fig. 5 shows the scheme of a monitoring device
- the bolts or screws of the winding-end restraint system 29 are to be secured in the rotor winding head 16.
- the retention elements according to FIGS. 2 a and 3 are threaded rods 20 with nuts 21, it is necessary to secure the nuts 21 against unintentional loosening. However, should it come to an undesirable break in a screw or a bolt, it is necessary to retain the released parts in order to prevent destruction of the machine.
- the safeguard against flying away can be done according to the invention by a wire (wire lock 23 in Fig. 2b) or a tissue (fabric fuse 22 in Fig. 2b), which are stretched over the screw heads or nuts 21 in the circumferential direction.
- the screws can not move in the radial direction.
- the forces which are absorbed by the screws (or threaded rods 20) are large, since they must bear the centrifugal forces, which arise due to the weight of the winding head 16. If there is a break in the screw (or threaded rod 20), only the centrifugal force of the mass of the released screw piece acts on the fuse. This force is relatively small. For this reason, it is possible to retain a broken screw or threaded rod 20 by means of a wire or cloth.
- a suitable material for the fabric or fabric tape is a highly tear-resistant, even at higher temperatures stable tissue into consideration.
- the fabric band of the fabric securing 22 according to FIG. 2b can be made wide over the nuts 21 or screw heads, it is advantageous when using the wire lock 23 in the nuts 21 or threaded rods 20 or in the screw heads according to FIG. 3 in the circumferential direction to provide extending slots 24, in which the wire lock 23 is inserted. Through the running in the slots 24 wire, the nuts 21 and bolts can not rotate. At the same time the wire itself is secured against slipping.
- the tension (tension) in the wire or fabric tape is monitored by means of a suitable electronic sensor (voltage measuring device 25) (for example with a load cell). If a part of a screw breaks loose due to breakage, the mechanical tension in the wire (wire lock 23) increases and can be detected.
- a suitable electronic sensor voltage measuring device 25
- the sensor or the voltage measuring device 25 can be integrated directly in the wire running on the circumference (upper part in Fig.
- the measuring signals of the various sensors or voltage measuring devices 25 in the rotor winding head 16 are fed to a central evaluation unit 26 in a corresponding monitoring device (28 in FIG. 5) and evaluated there. If unusual changes in the voltage pattern of the fuses of the winding head restraint system 29 are detected during operation, a message is sent to a subsequent display unit 27 and displayed there. The message can be routed simultaneously to a central control of the machine and there initiate an automatic shutdown, so that the machine can be inspected in time.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The invention relates to an electric machine (10) in a performance range of several MVA, particularly an asynchronous machine, wherein said electric machine (10) comprises a rotor rotating about an axis with a rotor winding which is arranged in a rotor sheet metal body and comprises in each case an exposed winding head (16) outside the rotor sheet metal body. Said winding head is provided with a winding head restraint system (29) for absorbing the centrifugal forces which occur during operation, said winding head restraint system comprising a plurality of radially acting retaining elements (20, 21). The safety of the machine is increased in that the retaining elements (20, 21) are provided with securing means (22, 23) which secure the retaining elements (20, 21) against unintended release and/or from flying away in the event of a fracture.
Description
BESCHREIBUNG DESCRIPTION
ELEKTRISCHE MASCHINE MIT ROTORWICKELKOPFRÜCKHALTESYSTEMELECTRIC MACHINE WITH ROTOR CYLINDER HEAD RESTRAINT SYSTEM
TECHNISCHES GEBIETTECHNICAL AREA
Die vorliegende Erfindung bezieht sich auf das Gebiet der elektrischen Maschinen. Sie betrifft eine elektrische Maschine gemäss dem Oberbegriff des Anspruchs 1.The present invention relates to the field of electric machines. It relates to an electrical machine according to the preamble of claim 1.
STAND DER TECHNIKSTATE OF THE ART
Doppelt gespeiste Asynchronmaschinen im Leistungsbereich von 20 MVA bis 500 MVA können zur drehzahlvariablen Energieproduktion eingesetzt werden. Diese Maschinen zeichnen sich durch eine verteilte Dreiphasenwicklung auf dem Rotor aus. Die Rotorwicklung besteht aus einzelnen Stäben, welche im Rotorblechpaket in Nuten eingebettet sind. Im Wickelkopf werden die einzelnen Stäbe zu einer Wicklung verschaltet. Die Anordnung der Stabverbindungen ist gleichmassig am Umfang verteilt. Durch die
Rotation des Rotors sind die Wickelköpfe Zentrifugalkräften ausgesetzt, gegen die sie mittels Wickelkopfrückhaltesystemen mechanisch gesichert werden müssen. Prinzipiell sind heute drei Arten von Wickelkopfrückhaltesystemen bekannt: 1 . Befestigung mittels einer Stahlkappe, wie dies bei Turbogeneratoren der Fall ist.Double-fed asynchronous machines in the power range from 20 MVA to 500 MVA can be used for variable-speed energy production. These machines are characterized by a distributed three-phase winding on the rotor. The rotor winding consists of individual rods, which are embedded in grooves in the rotor core. In the winding head, the individual rods are connected to form a winding. The arrangement of the rod connections is evenly distributed around the circumference. By the Rotation of the rotor, the winding heads are exposed to centrifugal forces, against which they must be mechanically secured by means of winding head restraint systems. In principle, three types of winding head restraint systems are known today: 1. Attachment by means of a steel cap, as is the case with turbogenerators.
2. Befestigung, indem der gesamte Wickelkopf mit einem Stahlkabel, Draht, oder Kunststofffolie umwickelt wird.2. Fastening by wrapping the entire winding head with a steel cable, wire, or plastic film.
3. Befestigung mittels Bolzen, Schrauben oder U-förmigen Bügeln.3. Fixing with bolts, screws or U-shaped brackets.
In Fig. 1 ist ausschnittweise in stark vereinfachter Form eine solche Asynchronmaschine 10 wiedergegeben. Sie umfasst einen um eine Achse 18 drehbaren Rotor 19, der konzentrisch von einem Statorblechkörper 14 mit entsprechender Statorwicklung und einem Statorwickelkopf 17 umgeben ist. Der Rotor 19 umfasst einen Zentralkörper 11 , der an den Enden jeweils in eine Welle 11 ' übergeht. Der Zentralkörper 11 ist umschlossen von einem Rotorblechkörper 12, in dem die Rotorwicklung 13 verläuft. Auf einer der Wellen 11 ' sind Schleifringe 15 angeordnet, die der Versorgung der Rotorwicklung 13 mit Strom dienen. Der Rotorwickelkopf 16, der in Fig. 2(a) in vertikaler Orientierung noch einmal vergrössert dargestellt ist, ist mit einem Wickelkopfrückhaltesystem 29 ausgestattet, das gemäss Fig. 2(a) mit radial durch den Rotorwickelkopf 16 verlaufenden Rückhalteelementen in Form von mit Muttern 21 versehenen Gewindestangen 20 oder Schraubbolzen oder dgl. ausgerüstet ist.In Fig. 1, such an asynchronous machine 10 is shown in fragmentary form in a greatly simplified form. It comprises a rotatable about an axis 18 rotor 19 which is concentrically surrounded by a stator lamination 14 with a corresponding stator winding and a stator winding 17. The rotor 19 comprises a central body 11, which merges at the ends in each case in a shaft 11 '. The central body 11 is enclosed by a rotor laminated body 12, in which the rotor winding 13 extends. On one of the shafts 11 'slip rings 15 are arranged, which serve to supply the rotor winding 13 with power. The rotor winding head 16, which is shown enlarged again in a vertical orientation in FIG. 2 (a), is equipped with a winding head restraint system 29 which, according to FIG. 2 (a), has retaining elements in the form of nuts 21 extending radially through the rotor winding head 16 provided threaded rods 20 or bolts or the like. Equipped.
Die Rückhalteelemente 20, 21 fangen die während des Betriebes der Maschine an dem Rotorwickelkopf 16 angreifenden Zentrifugalkräfte auf und leiten sie in den unterhalb des Wickelkopfes angeordneten massiven Teil des Rotors ein. Es kann nun während des Betriebes über einen längeren Zeitraum passieren, dass die mechanisch stark belasteten Rückhalteelemente 20, 21 brechen oder auf andere Weise ihre mechanische Integrität einbüssen. Es kann aber auch sein, dass sich die Muttern 21 oder Versch raubungen lösen und die Funktion der Rückhalteelemente 20, 21 auf diese Weise verloren geht. Löst sich im Rahmen dieses Versagens ein
Teil der Rückhalteelemente 20, 21 und wird nach aussen geschleudert, können Folgeschäden an der Maschine auftreten, die zu einem längeren Ausfall der Maschine und damit zu hohen Folgekosten führen.The retaining elements 20, 21 catch the centrifugal forces acting on the rotor winding head 16 during operation of the machine and introduce them into the massive part of the rotor arranged below the winding head. It can now happen during operation over a long period of time that the mechanically heavily loaded retaining elements 20, 21 break or otherwise lose their mechanical integrity. But it may also be that the nuts 21 or Versch robberies solve and the function of the retaining elements 20, 21 is lost in this way. Solves in the context of this failure Part of the retaining elements 20, 21 and is thrown to the outside, consequential damage to the machine can occur, leading to a prolonged failure of the machine and thus high follow-up costs.
In allen Fällen ist es wünschenswert, ein solches Versagen der Rückhalteelemente 20, 21 entweder ganz zu vermeiden oder zumindest die Folgeschäden in Grenzen zu halten. Darüber hinaus wäre es von Vorteil, wenn ungewöhnliche Veränderungen im Wickelkopf rechtzeitig erkannt werden könnten und die Maschine frühzeitig abgeschaltet werden könnte, um Schäden zu begrenzen oder gar nicht erst aufkommen zu lassen.In all cases, it is desirable to avoid such a failure of the retaining elements 20, 21 either completely or at least to keep the consequential damage within limits. In addition, it would be advantageous if unusual changes in the winding head could be detected in good time and the machine could be shut down early to limit damage or even not to pay.
DARSTELLUNG DER ERFINDUNGPRESENTATION OF THE INVENTION
Es ist daher Aufgabe der Erfindung, eine elektrische Maschine der eingangs genannten Art so auszugestalten, dass Schäden am Rotorwickelkopf aufgrund der angreifenden Zentrifugalkräfte vermieden oder zumindest begrenzt werden können.It is therefore an object of the invention to provide an electrical machine of the type mentioned in such a way that damage to the rotor winding head due to the attacking centrifugal forces can be avoided or at least limited.
Die Aufgabe wird durch die Gesamtheit der Merkmale des Anspruchs 1 gelöst. Wichtig für die Erfindung ist, dass die Rückhalteelemente mit Sicherungsmitteln versehen sind, welche die Rückhalteelemente gegen ein unbeabsichtigtes Lösen und/oder Wegfliegen im Falle eines Bruches sichern.The object is solved by the entirety of the features of claim 1. Important for the invention is that the retaining elements are provided with securing means which secure the retaining elements against accidental loosening and / or flying away in the event of breakage.
Eine Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass dieAn embodiment of the invention is characterized in that the
Rückhalteelemente als sich in radialer Richtung durch den Wickelkopf hindurch erstreckende Gewindestangen oder Schraubbolzen ausgebildet sind, die am äusseren Ende mit einer Mutter oder einem Schraubenkopf zur Abstützung des Wickelkopfes versehen sind.Retaining elements as in the radial direction through the winding head extending through threaded rods or bolts are formed, which are provided at the outer end with a nut or a screw head for supporting the winding head.
Die Sicherungsmittel können dabei eine Gewebesicherung umfassen, die, insbesondere in Form eines Gewebebandes, vorzugsweise eng anliegend und
in Umfangsrichtung, über die Aussenseiten der Muttern bzw. Schraubenköpfe gespannt ist.The securing means may comprise a fabric securing, which, in particular in the form of a fabric band, preferably tight-fitting and in the circumferential direction, is stretched over the outsides of the nuts or screw heads.
Die Sicherungsmittel können aber auch eine Drahtsicherung umfassen, die in Form eines Drahtes, vorzugsweise eng anliegend und in Umfangsrichtung, über die Aussenseiten der Muttern und/oder Gewindestangen bzw. Schraubenköpfe gespannt ist.But the securing means may also comprise a wire lock, which is in the form of a wire, preferably tight-fitting and in the circumferential direction, stretched over the outer sides of the nuts and / or threaded rods or screw heads.
In diesem Fall sind an den Rückhalteelementen vorzugsweise Schlitze vorge- sehen, in welche die Drahtsicherung eingelegt ist, die die Rückhalteelemente zugleich gegen ein Verdrehen sichert.In this case, slots are preferably provided on the retaining elements, in which the wire lock is inserted, which simultaneously secures the retaining elements against rotation.
Eine andere Ausgestaltung der Erfindung zeichnet sich dadurch aus, dass das Wickelkopfrückhaltesystem mit Überwachungsmitteln ausgestattet ist, mit welchen die ordnungsgemässe Funktion des Wickelkopfes überwacht werden kann.Another embodiment of the invention is characterized in that the winding head restraint system is equipped with monitoring means with which the proper function of the winding head can be monitored.
Die Überwachungsmittel umfassen vorzugsweise Spannungsmessvorrichtungen, welche die mechanische Spannung der Sicherungsmittel im Wickelkopfrückhaltesystem messen und zur Auswertung an eine Auswerteeinheit weitergeben.The monitoring means preferably comprise voltage measuring devices, which measure the mechanical tension of the securing means in the winding head restraint system and pass it on to an evaluation unit for evaluation.
KURZE ERLÄUTERUNG DER FIGURENBRIEF EXPLANATION OF THE FIGURES
Die Erfindung soll nachfolgend anhand von Ausführungsbeispielen im Zusammenhang mit der Zeichnung näher erläutert werden. Es zeigenThe invention will be explained in more detail with reference to embodiments in conjunction with the drawings. Show it
Fig. 1 in einer stark vereinfachten Darstellung einen Ausschnitt einer Asynchronmaschine mit Stator- und Rotorwicklung und einemFig. 1 in a highly simplified representation of a section of an asynchronous machine with stator and rotor winding and a
Wickelkopfrückhaltesystem für den Rotorwickelkopf nach dem Stand der Technik;
Fig. 2 in zwei Teilfiguren den vergrösserten Ausschnitt desWinding head restraint system for the rotor winding head according to the prior art; Fig. 2 in two sub-figures the enlarged section of
Rotorwickelkopfes aus Fig. 1 in vertikaler Orientierung (Fig. 2a) und zwei Arten von Sicherungen für die Rückhalteelemente gemäss verschiedenen Ausführungsbeispielen der ErfindungRotor winding head of Figure 1 in a vertical orientation (Fig. 2a) and two types of fuses for the retaining elements according to various embodiments of the invention
(Fig. 2b);(Fig. 2b);
Fig. 3 in zwei Teilfiguren den Schnitt durch (Fig. 3a) und dieFig. 3 in two sub-figures the section through (Fig. 3a) and the
Draufsicht auf (Fig. 3b) eine Drahtsicherung von Gewindestangen und Muttern umfassendenTop view of (Fig. 3b) comprising a wire fuse of threaded rods and nuts
Rückhalteelementen gemäss einem anderen Ausführungsbeispiel der Erfindung;Retaining elements according to another embodiment of the invention;
Fig. 4 den beispielhaften Einbau von Überwachungsmitteln in das Rückhaltesystem gemäss einem anderen Ausführungsbeispiel der Erfindung; und4 shows the exemplary installation of monitoring means in the restraint system according to another embodiment of the invention; and
Fig. 5 das Schema einer Überwachungsvorrichtung, die mit denFig. 5 shows the scheme of a monitoring device, with the
Überwachungsmitteln der Fig. 4 arbeitet.Monitoring means of Fig. 4 operates.
WEGE ZUR AUSFÜHRUNG DER ERFINDUNGWAYS FOR CARRYING OUT THE INVENTION
Gemäss der Erfindung sollen die Bolzen oder Schrauben des Wickelkopf- rückhaltesystems 29 im Rotorwickelkopf 16 gesichert werden. Handelt es sich bei den Rückhalteelementen gemäss Fig. 2a und Fig. 3 um Gewindestangen 20 mit Muttern 21 , gilt es, die Muttern 21 gegen ein ungewolltes Lösen zu sichern. Sollte es aber zu einem unerwünschten Bruch in einer Schraube oder einem Bolzen kommen, gilt es, die frei werdenden Teile zurückzuhalten, um eine Zerstörung der Maschine zu verhindern.
Die Sicherung gegen Wegfliegen kann gemäss der Erfindung durch einen Draht (Drahtsicherung 23 in Fig. 2b) oder aber ein Gewebe (Gewebesicherung 22 in Fig. 2b) erfolgen, die in Umfangsrichtung über die Schraubenköpfe oder Muttern 21 gespannt sind. Im normalen Betrieb können sich die Schrauben (oder Gewindestangen 20) nicht in radialer Richtung bewegen. Die Kräfte, welche von den Schrauben (oder Gewindestangen 20) aufgenommen werden, sind gross, da diese die Zentrifugalkräfte, welche durch das Gewicht des Wickelkopfs 16 entstehen, tragen müssen. Kommt es zu einem Bruch in der Schraube (oder Gewindestange 20), wirkt nur noch die Zentrifugalkraft der Masse des freiwerdenden Schraubenstücks auf die Sicherung. Diese Kraft ist relativ klein. Aus diesem Grund ist es möglich, eine gebrochene Schraube bzw. Gewindestange 20 mittels eines Drahtes oder Gewebes zurückzuhalten. Als geeignetes Material für das Gewebe bzw. Gewebeband kommt ein hoch reissfestes, auch bei höheren Temperaturen stabiles Gewebe in Betracht.According to the invention, the bolts or screws of the winding-end restraint system 29 are to be secured in the rotor winding head 16. If the retention elements according to FIGS. 2 a and 3 are threaded rods 20 with nuts 21, it is necessary to secure the nuts 21 against unintentional loosening. However, should it come to an undesirable break in a screw or a bolt, it is necessary to retain the released parts in order to prevent destruction of the machine. The safeguard against flying away can be done according to the invention by a wire (wire lock 23 in Fig. 2b) or a tissue (fabric fuse 22 in Fig. 2b), which are stretched over the screw heads or nuts 21 in the circumferential direction. During normal operation, the screws (or threaded rods 20) can not move in the radial direction. The forces which are absorbed by the screws (or threaded rods 20) are large, since they must bear the centrifugal forces, which arise due to the weight of the winding head 16. If there is a break in the screw (or threaded rod 20), only the centrifugal force of the mass of the released screw piece acts on the fuse. This force is relatively small. For this reason, it is possible to retain a broken screw or threaded rod 20 by means of a wire or cloth. As a suitable material for the fabric or fabric tape is a highly tear-resistant, even at higher temperatures stable tissue into consideration.
Während das Gewebeband der Gewebesicherung 22 gemäss Fig. 2b breit über die Muttern 21 bzw. Schraubenköpfe geführt werden kann, ist es bei Einsatz der Drahtsicherung 23 von Vorteil, in den Muttern 21 bzw. Gewindestangen 20 oder in den Schraubenköpfen gemäss Fig. 3 in Umfangsrichtung verlaufende Schlitze 24 vorzusehen, in welche die Drahtsicherung 23 eingelegt wird. Durch den in den Schlitzen 24 verlaufenden Draht können sich die Muttern 21 bzw. Schraubbolzen nicht drehen. Gleichzeitig ist der Draht selbst gegen ein Verrutschen gesichert.While the fabric band of the fabric securing 22 according to FIG. 2b can be made wide over the nuts 21 or screw heads, it is advantageous when using the wire lock 23 in the nuts 21 or threaded rods 20 or in the screw heads according to FIG. 3 in the circumferential direction to provide extending slots 24, in which the wire lock 23 is inserted. Through the running in the slots 24 wire, the nuts 21 and bolts can not rotate. At the same time the wire itself is secured against slipping.
Mit der Sicherung des Rückhaltesystems kann gleichzeitig mit Vorteil eine Überwachung verbunden werden. Die Überwachung dient dem Schutz der Maschine. Sie ist dazu da, einen unerwünschten Bruch einer Schraube oder eines Bolzens, bzw. eine unzulässige Ausdehnung des Rotorwickelkopfes 16 zu detektieren und zu melden, damit die Maschine rechtzeitig ausser Betrieb genommen werden und Reparaturmassnahmen eingeleitet werden können.
Dazu wird gemäss Fig. 4 und 5 die Spannung (der Zug) im Draht oder Gewebeband mittels eines geeigneten elektronischen Sensors (Spannungsmessvorrichtung 25) überwacht (zum Beispiel mit einer Kraftmessdose). Löst sich durch Bruch ein Teil einer Schraube, nimmt die mechanische Spannung im Draht (Drahtsicherung 23) zu und kann detektiert werden. Dabei kann der Sensor bzw. die Spannungsmessvorrichtung 25 direkt im Draht am Umfang verlaufend integriert sein (oberer Teil in Fig. 4), oder aber gleich die Spannung zweier Sicherungsdrähte messen, indem der Sensor senkrecht zu dem Drähten angeordnet ist (unterer Teil der Fig. 4). Weiter besteht die Möglichkeit, die Drähte mit entsprechenden Umleitungen durch die Kreuzstellen der Wickelstäbe zu führen, damit die Spannungsmessung innerhalb des Rotorkörpers vorgenommen werden kann.With the backup of the restraint system monitoring can be connected with advantage at the same time. The monitoring serves to protect the machine. It is there to detect an unwanted breakage of a screw or bolt, or an inadmissible expansion of the rotor winding head 16 and report, so that the machine can be taken out of service in time and repair measures can be initiated. 4 and 5, the tension (tension) in the wire or fabric tape is monitored by means of a suitable electronic sensor (voltage measuring device 25) (for example with a load cell). If a part of a screw breaks loose due to breakage, the mechanical tension in the wire (wire lock 23) increases and can be detected. In this case, the sensor or the voltage measuring device 25 can be integrated directly in the wire running on the circumference (upper part in Fig. 4), or equal measure the voltage of two fuse wires by the sensor is arranged perpendicular to the wires (lower part of FIG. 4). It is also possible to guide the wires with appropriate diversions through the cross points of the winding rods, so that the voltage measurement can be made within the rotor body.
Die Messsignale der verschiedenen Sensoren bzw. Spannungsmessvorrichtun- gen 25 im Rotorwickelkopf 16 werden in einer entsprechenden Überwachungsvorrichtung (28 in Fig. 5) einer zentralen Auswerteeinheit 26 zugeführt und dort ausgewertet. Werden während des Betriebes ungewöhnliche Veränderungen im Spannungsmuster der Sicherungen des Wickelkopfrückhaltesystems 29 detektiert, wird eine Meldung an eine nachfolgende Anzeigeeinheit 27 abgegeben und dort angezeigt. Die Meldung kann gleichzeitig in eine zentrale Steuerung der Maschine geleitet werden und dort eine automatische Abschaltung initiieren, so dass die Maschine rechtzeitig einer Inspektion unterzogen werden kann.
The measuring signals of the various sensors or voltage measuring devices 25 in the rotor winding head 16 are fed to a central evaluation unit 26 in a corresponding monitoring device (28 in FIG. 5) and evaluated there. If unusual changes in the voltage pattern of the fuses of the winding head restraint system 29 are detected during operation, a message is sent to a subsequent display unit 27 and displayed there. The message can be routed simultaneously to a central control of the machine and there initiate an automatic shutdown, so that the machine can be inspected in time.
BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS
10 elektrische Maschine (Asynchronmaschine)10 electric machine (asynchronous machine)
1 1 Zentralkörper1 1 central body
1 1 ' Welle1 1 'shaft
12 Rotorblechkörper12 rotor body
13 Rotorwicklung13 rotor winding
14 Statorblechkörper14 stator laminations
15 Schleifring15 slip ring
16 Rotorwickelkopf16 rotor winding head
17 Statorwickelkopf17 Stator winding head
18 Rotationsachse18 rotation axis
19 Rotor19 rotor
20 Gewindestange20 threaded rod
21 Mutter21 mother
22 Gewebesicherung22 tissue protection
23 Drahtsicherung23 wire lock
24 Schlitz24 slot
25 Spannungsmessvorrichtung25 voltage measuring device
26 Auswerteeinheit26 evaluation unit
27 Anzeigeeinheit27 Display unit
28 Überwachungsvorrichtung28 monitoring device
29 Wickelkopfrückhaltesystem
29 Winding head restraint system
Claims
1. Elektrische Maschine (10) im Leistungsbereich von mehreren MVA, insbesondere Asynchronmaschine, welche elektrische Maschine (10) einen um eine Achse (18) drehenden Rotor (19) mit einer Rotorwicklung (13) umfasst, die in einem Rotorblechkörper (12) angeordnet ist und ausserhalb des Rotorblechkörpers (12) jeweils einen frei liegenden Wickelkopf (16) aufweist, der zum Auffangen der während des Betriebs auftretenden Zentrifugalkräfte mit einem Wickelkopfrückhaltesystem (29) ausgestattet ist, welches eine Mehrzahl von radial wirkenden Rückhalteelementen (20, 21 ) umfasst, dadurch gekennzeichnet, dass die Rückhalteelemente (20, 21 ) mit Sicherungsmitteln (22, 23) versehen sind, welche die Rückhalteelemente (20, 21 ) gegen ein unbeabsichtigtes Lösen und/oder Wegfliegen im Falle eines Bruches sichern.1. Electrical machine (10) in the power range of several MVA, in particular asynchronous machine, which electrical machine (10) about an axis (18) rotating rotor (19) with a rotor winding (13) arranged in a rotor laminated body (12) is and outside the rotor laminated body (12) each having an exposed winding head (16) which is provided for collecting the centrifugal forces occurring during operation with a winding head restraint system (29), which comprises a plurality of radially acting retaining elements (20, 21), characterized in that the retaining elements (20, 21) are provided with securing means (22, 23) which secure the retaining elements (20, 21) against unintentional loosening and / or flying away in the event of breakage.
2. Elektrische Maschine nach Anspruch 1 , dadurch gekennzeichnet, dass die Rückhalteelemente (20, 21 ) als sich in radialer Richtung durch den Wickelkopf (16) hindurch erstreckende Gewindestangen (20) oder Schraubbolzen ausgebildet sind, die am äusseren Ende mit einer Mutter (21 ) oder einem Schraubenkopf zur Abstützung des Wickelkopfes (16) versehen sind.2. Electrical machine according to claim 1, characterized in that the retaining elements (20, 21) as in the radial direction through the winding head (16) extending therethrough threaded rods (20) or bolts are formed, which at the outer end with a nut (21 ) or a screw head for supporting the winding head (16) are provided.
3. Elektrische Maschine nach Anspruch 2, dadurch gekennzeichnet, dass die Sicherungsmittel (22, 23) eine Gewebesicherung (22) umfassen, die, insbesondere in Form eines Gewebebandes, vorzugsweise eng anliegend und in Umfangsrichtung, über die Aussenseiten der Muttern (21 ) bzw. Schraubenköpfe gespannt ist.3. Electrical machine according to claim 2, characterized in that the securing means (22, 23) comprise a fabric securing (22), in particular in the form of a fabric band, preferably tightly and circumferentially, on the outer sides of the nuts (21) or . Screw heads is stretched.
4. Elektrische Maschine nach Anspruch 2, dadurch gekennzeichnet, dass die Sicherungsmittel eine Drahtsicherung (23) umfassen, die in Form eines Drahtes, vorzugsweise eng anliegend und in Umfangsrichtung, über die4. Electrical machine according to claim 2, characterized in that the securing means comprise a wire lock (23) in the form of a wire, preferably in close fitting and in the circumferential direction over the
Aussenseiten der Muttern (21 ) und/oder Gewindestangen (20) bzw. Schraubenköpfe gespannt ist. Outside of the nuts (21) and / or threaded rods (20) or screw heads is stretched.
5. Elektrische Maschine nach Anspruch 4, dadurch gekennzeichnet, dass an den Rückhalteelementen (20, 21 ) Schlitze (24) vorgesehen sind, in welche die Drahtsicherung (23) eingelegt ist und die Rückhalteelemente (20, 21 ) zugleich gegen ein Verdrehen sichert.5. Electrical machine according to claim 4, characterized in that on the retaining elements (20, 21) slots (24) are provided, in which the wire lock (23) is inserted and the retaining elements (20, 21) at the same time against rotation.
6. Elektrische Maschine nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Wickelkopfrückhaltesystem (29) mit Überwachungsmitteln (25) ausgestattet ist, mit welchen die ordnungsgemässe Funktion des Wickelkopfes (16) überwacht wird.6. Electrical machine according to one of claims 1 to 5, characterized in that the winding head restraint system (29) is equipped with monitoring means (25) with which the proper function of the winding head (16) is monitored.
7. Elektrische Maschine nach Anspruch 6, dadurch gekennzeichnet, dass die Überwachungsmittel Spannungsmessvorrichtungen (25) umfassen, welche die mechanische Spannung der Sicherungsmittel (22, 23) im Wickelkopf- rückhaltesystem (29) messen und zur Auswertung an eine Auswerteeinheit (26) weitergeben. 7. Electrical machine according to claim 6, characterized in that the monitoring means comprise voltage measuring devices (25) which measure the mechanical tension of the securing means (22, 23) in the winding head restraint system (29) and pass it on to an evaluation unit (26) for evaluation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009018552 | 2009-04-24 | ||
| DE200910037989 DE102009037989A1 (en) | 2009-08-20 | 2009-08-20 | Electric machine for use in performance range of multiple megavolt amperes, particularly asynchronous machine, has rotor rotating about axis with rotor winding, which is arranged in rotor sheet metal body |
| PCT/EP2010/055111 WO2010121987A1 (en) | 2009-04-24 | 2010-04-19 | Electric machine with a restraint system for the rotor winding head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2422430A1 true EP2422430A1 (en) | 2012-02-29 |
Family
ID=42310167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10715793A Withdrawn EP2422430A1 (en) | 2009-04-24 | 2010-04-19 | Electric machine with a restraint system for the rotor winding head |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US8643248B2 (en) |
| EP (1) | EP2422430A1 (en) |
| KR (1) | KR20120027162A (en) |
| CN (1) | CN102414959B (en) |
| BR (1) | BRPI1014282A2 (en) |
| CA (1) | CA2759459C (en) |
| RU (1) | RU2544179C2 (en) |
| WO (1) | WO2010121987A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103000003B (en) * | 2012-12-29 | 2015-06-17 | 广西桂冠电力股份有限公司大化水力发电总厂 | Bulb tubular water turbine generator set runner connecting bolt fracture warning device |
| CN104218715A (en) * | 2014-10-10 | 2014-12-17 | 哈尔滨电机厂有限责任公司 | Double-pressing plate fixing structure for end part of rotor winding of large-scale alternating current excitation generator motor |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191014680A (en) | 1910-06-17 | 1911-06-15 | Charles Algernon Parsons | Improvements in Dynamo Electric Machinery. |
| US2293581A (en) * | 1941-05-10 | 1942-08-18 | Budd Edward G Mfg Co | Separable fastening element |
| DE1488018A1 (en) * | 1963-03-15 | 1969-04-03 | Siemens Ag | Method for producing a support for winding heads of the rotor winding of an electrical machine |
| US3648749A (en) | 1970-02-05 | 1972-03-14 | Central Screw Co | Fastener assembly with locking capabilities |
| US3820381A (en) | 1972-06-19 | 1974-06-28 | Gulf Oil Corp | Fastener system and method for inspecting same |
| US4415825A (en) | 1982-01-27 | 1983-11-15 | Westinghouse Electric Corp. | End turn bracing with locking and alignment device |
| JPS59110358A (en) * | 1982-12-16 | 1984-06-26 | Toshiba Corp | Brushless rotary electric machine |
| JPH08172284A (en) * | 1994-12-16 | 1996-07-02 | Asia Electron Inc | Mounting structure of heat pipe |
| DE19513457A1 (en) * | 1995-04-08 | 1996-10-10 | Abb Management Ag | Rotor of an electrical machine |
| DE19535700C2 (en) * | 1995-09-26 | 1999-03-04 | Vem Elektroantriebe Gmbh | Arrangement for fastening the winding heads to the slip ring rotor of an asynchronous machine of large diameter |
| US6972507B1 (en) * | 2004-05-21 | 2005-12-06 | General Electric Company | End winding restraint in an electrical machine |
| US7293466B2 (en) * | 2005-07-19 | 2007-11-13 | Hitachi, Ltd. | Bolt with function of measuring strain |
| EP1936210A1 (en) * | 2006-12-19 | 2008-06-25 | BAE Systems PLC | Locking Expanding Diameter Fasteners |
| PT2132859E (en) * | 2007-03-30 | 2013-06-03 | Alstom Technology Ltd | Rotor of an electric machine |
| RU68803U1 (en) * | 2007-06-25 | 2007-11-27 | Общество с ограниченной ответственностью "Сибирская электротехническая компания" (ООО "СЭТК") | MOTOR-BRUSHED BRANCH ASSEMBLY |
-
2010
- 2010-04-19 CA CA2759459A patent/CA2759459C/en not_active Expired - Fee Related
- 2010-04-19 BR BRPI1014282A patent/BRPI1014282A2/en not_active IP Right Cessation
- 2010-04-19 EP EP10715793A patent/EP2422430A1/en not_active Withdrawn
- 2010-04-19 KR KR1020117025006A patent/KR20120027162A/en active Search and Examination
- 2010-04-19 WO PCT/EP2010/055111 patent/WO2010121987A1/en active Application Filing
- 2010-04-19 CN CN201080017929.5A patent/CN102414959B/en not_active Expired - Fee Related
- 2010-04-19 RU RU2011147717/07A patent/RU2544179C2/en not_active IP Right Cessation
-
2011
- 2011-10-18 US US13/275,438 patent/US8643248B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010121987A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| BRPI1014282A2 (en) | 2016-04-05 |
| CN102414959A (en) | 2012-04-11 |
| RU2011147717A (en) | 2013-05-27 |
| KR20120027162A (en) | 2012-03-21 |
| US8643248B2 (en) | 2014-02-04 |
| CN102414959B (en) | 2016-01-20 |
| RU2544179C2 (en) | 2015-03-10 |
| CA2759459A1 (en) | 2010-10-28 |
| CA2759459C (en) | 2016-06-21 |
| WO2010121987A1 (en) | 2010-10-28 |
| US20120146450A1 (en) | 2012-06-14 |
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