WO2021213583A1 - Electrical contacting of a stator of an electrical machine - Google Patents

Electrical contacting of a stator of an electrical machine Download PDF

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Publication number
WO2021213583A1
WO2021213583A1 PCT/DE2021/100301 DE2021100301W WO2021213583A1 WO 2021213583 A1 WO2021213583 A1 WO 2021213583A1 DE 2021100301 W DE2021100301 W DE 2021100301W WO 2021213583 A1 WO2021213583 A1 WO 2021213583A1
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WIPO (PCT)
Prior art keywords
busbar
ring
stator
ring conductor
electrical
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PCT/DE2021/100301
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German (de)
French (fr)
Inventor
Andreas Ruppert
Original Assignee
Schaeffler Technologies AG & Co. KG
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Publication date
Application filed by Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Publication of WO2021213583A1 publication Critical patent/WO2021213583A1/en

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    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/09—Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations

Definitions

  • the invention relates to electrical contacting of a stator of an electrical machine.
  • the stator of the electrical machine has three ring conductors which are arranged at one end of the stator. Three busbars are provided, one of the busbars being connected in an electrically conductive manner to one of the ring conductors via ends of the ring conductors.
  • the German patent application DE 10 2014201 637 A1 relates to a method for producing a stator which has several stator poles and at least one busbar for electrically connecting the ends of the windings of different stator poles.
  • the busbar is constructed in several parts and has several holding parts, on each of which at least one winding wire can be fixed. After the winding process, the busbar is put together in that the holding parts are connected in an electrically conductive manner by means of the connecting part.
  • the European patent EP 3 300218 B1 relates to a contact ring for arrangement on a stator of an electronically commutated electric motor.
  • the contact ring is formed from at least two pairs of identical, partially ring-shaped, metallic elements. Each of the pairs is connected to a terminal lug for connection to a voltage source.
  • the connection lugs require a lot of axial installation space.
  • Permanent magnet synchronous machines are used in many industrial applications and increasingly also in the automotive industry.
  • Such a PSM machine consists of a stator to be energized and a permanently excited rotor.
  • the stator consists at least of stator windings (wire windings), a stator carrier, a connection ring and a terminal for power electronics.
  • stator teeth As a rule, three consecutive teeth form one Pole pair.
  • the individual pole pairs for example three teeth, must be coupled to one another or electrically connected.
  • the implementation and accessibility of this star point is often limited by the installation space.
  • a common way is to connect the two ends of a ring conductor to a busbar. This requires a high level of positioning accuracy, more precise individual part tolerances and several welding and connection points.
  • the object of the invention is therefore to create electrical contacting of a stator of an electrical machine through an embodiment of the interconnection ring, so that the contacting and assembly of the busbar and the associated ring conductor can be considerably simplified, so that the processes are streamlined, process times are shortened and Costs can be saved.
  • This object is achieved by making electrical contact with a stator of an electrical machine, which comprises the features of claim 1.
  • the electrical contacting according to the invention of the stator of the electrical machine is achieved in that the ends of each ring conductor overlap in the circumferential direction and are firmly connected to one another.
  • a flat piece of the corresponding busbar is connected to the overlapping ends of the corresponding ring conductor.
  • the contacting according to the invention has the advantage that electrical losses are significantly reduced since the number of connection points (weld points) is reduced.
  • the contact area of the connection between the ring conductor and the flat piece of the corresponding busbar is significantly increased.
  • the connection of each ring conductor is carried out at its ends by means of a weld seam.
  • the connection of the Flat piece of the corresponding busbar can be executed with the overlapping ends of the corresponding ring conductor by means of a weld seam.
  • Each ring conductor has an S-shaped section at each end. As a result of the impact, the two ends can be arranged so as to overlap in the axial direction.
  • Each busbar has an offset so that a threaded bushing of each busbar is arranged at a distance in the axial direction from the ring conductor.
  • the busbars designed according to the invention can be made much simpler.
  • the contact area to the ring conductors is flat and therefore forgives large tolerance deviations.
  • the manufacturing costs can also be reduced by the flat contacting area, since less manufacturing effort, such as, for. B. Bending operations in the training of the
  • the installation space in the area of the contact (between busbar and ring conductor) can be reduced considerably.
  • This optimization also benefits an insulation process, since the area is now more easily accessible and can therefore be more easily integrated into an insulation process.
  • the current circuit can also be optimized according to the invention.
  • FIG. 1 shows a perspective top view of a stator end on which
  • Busbars connect the ring conductors.
  • FIG. 2 shows an enlarged perspective view of the assignment of one of the busbars to the respective ring conductor according to the prior art.
  • Figure 3 shows a perspective view of the electrically conductive connection of the busbars with the respective ring conductor according to the prior art.
  • FIG. 4 shows a perspective view of a ring conductor according to the invention.
  • FIG. 5 shows a perspective view of the assignment and connection according to the invention of one of the busbars with the respective ring conductor.
  • FIG. 6 shows a side view of a busbar which is connected to the ring conductor according to the invention.
  • FIG. 7 shows a side view of a busbar which is connected to the ring conductor according to the prior art. Identical elements are used for elements of the invention which are the same or have the same effect
  • Figure 1 shows a perspective top view of a stator end 10, on which a first, second and third busbar 1, 2 and 3, according to the prior art, are electrically conductively connected to the corresponding first, second and third ring conductors 11, 12 and 13 .
  • the first, second and third ring conductors 11, 12 and 13 have two ends 15 protruding in the axial direction A, which are connected to the corresponding first, second and third busbars 1, 2 and 3 for electrical contacting.
  • the first, second and third ring conductors 11, 12 and 13 lead to the individual stator windings (not shown).
  • a decentralized star connection 14 is also assigned to the ring conductors 11, 12 and 13.
  • FIG. 2 shows an enlarged perspective view of the assignment of one of the busbars 1, 2 or 3 to the respective ring conductor 11, 12 or 13 according to the prior art.
  • FIG. 2 only the third ring conductor 13 is shown, which is connected to the third busbar 3.
  • Each of the busbars 1, 2 and 3 has a threaded bushing 6 in the area of a first end 4, with which electrical conductors (not shown) can be connected.
  • each of the busbars 1, 2 and 3 has surface elements 8 which also protrude in the axial direction A from the busbar 1, 2 or 3.
  • the busbars 1, 2 or 3 are connected to the two ends 15 of the ring conductors 11, 12 or 13, which also extend in the axial direction A, via the surface elements 8.
  • Figure 3 shows a perspective view of the electrically conductive connection of the third busbar 3 with the respective third ring conductor 13 according to the prior art.
  • the state of the art there are different ways of realizing the interconnection of the ring conductors 11, 12 and 13.
  • a common way, as shown here, is that the two ends 15 of a ring conductor 11, 12 or 13 (here the third ring conductor 13) are connected to the corresponding busbar 1, 2 or 3 (here the third busbar 3).
  • the two ends 15 of the third ring conductor 13 are connected to the surface elements 8 of the third busbar 3 via weld seams 16. This requires a high level of positioning accuracy, precise individual part tolerance and several welding or connection points.
  • FIG. 4 shows the configuration of a ring conductor 11, 12 or 13 as used in the present invention.
  • the two ends 15 are designed in such a way that they overlap in the circumferential direction U.
  • FIG. 5 shows a perspective view of the assignment and connection according to the invention of one of the busbars 1, 2 or 3 with the respective ring conductor 11, 12 or 13.
  • the two ends 15 of each ring conductor 11, 12 or 13 are connected to one another via a weld 16.
  • each of the ring conductors 11, 12 or 13 has an S-shaped section 20 (see FIG. 4) at each of the two ends 15.
  • both ends 15 can be placed one on top of the other and can be connected, for example, by a weld 16.
  • a weld 16 it goes without saying for a person skilled in the art that the possibility of a connection by means of a weld 16 is only one of several possibilities.
  • gluing with a conductive adhesive would also be conceivable, for example.
  • the second end 5 of the busbars 1, 2 or 3 is designed as a flat piece 9.
  • the flat piece 9 of the busbars 1, 2 or 3 can also be connected to the two connected ends 15 of the ring conductor 11, 12 or 13 by means of a weld 16.
  • Each of the busbars 1, 2 or 3 has an offset 7.
  • the threaded bush 6 at the first end 4 of the busbar 1, 2 or 3 is spaced apart from the ring conductors 11, 12 or 13 by a distance B in the axial direction A.
  • FIG. 6 shows a side view of a busbar 1, 2 or 3 which is connected to the ring conductor 11, 12 or 13 according to the invention.
  • FIG. 7 shows a side view of a busbar 1, 2 or 3 which is connected to the ring conductor 11, 12 or 13 according to the prior art. From the comparison of Figure 6 and FIG. 7 shows that the installation space in the area of the contact between the busbar 1, 2 or 3 with the ring conductor 11, 12 or 13 can be reduced considerably.
  • the flat piece 9 of the embodiment of the busbar 1, 2 or 3 according to the invention does not extend in the axial direction A (see FIG. 6), which saves installation space in the axial direction A.
  • the surface elements 8 extend in the axial direction A and consequently take up installation space in the axial direction A (see FIG. 7).

Abstract

The invention relates to an electrical contacting of a stator of an electrical machine. Three annular conductors (11, 12, 13) are provided, which are arranged on a stator end (10). One of the bus bars (1, 2, 3) in each case is connected in an electrically conductive manner to one of the annular conductors (11, 12, 13) by the ends (15) of the annular conductors (11, 12, 13). The ends (15) of each annular conductor (11, 12, 13) overlap in the circumferential direction (U) and are fixed to one another. A flat piece (9) of the corresponding bus bar (1, 2, 3) is connected to the overlapping ends (15).

Description

Elektrische Kontaktierung eines Stators einer elektrischen Maschine Electrical contacting of a stator of an electrical machine
Die Erfindung betrifft eine elektrische Kontaktierung eines Stators einer elektrischen Maschine. Der Stator der elektrischen Maschine besitzt drei Ringleiter, die an einem Statorende angeordnet sind. Drei Stromschienen sind vorgesehen, wobei je eine der Stromschienen mit je einem der Ringleiter elektrisch leitend über Enden der Ringleiter verbunden ist. The invention relates to electrical contacting of a stator of an electrical machine. The stator of the electrical machine has three ring conductors which are arranged at one end of the stator. Three busbars are provided, one of the busbars being connected in an electrically conductive manner to one of the ring conductors via ends of the ring conductors.
Die deutsche Offenlegungsschrift DE 10 2014201 637 A1 betrifft ein Verfahren zum Herstellen eines Stators, der mehrere Statorpole und wenigstens eine Stromschiene zum elektrischen Verbinden der Enden der Wicklungen unterschiedlicher Statorpole aufweist. Die Stromschiene ist mehrteilig ausgebildet und hat mehrere Halteteile, an denen jeweils wenigstens ein Wickeldraht fixierbar ist. Zeitlich nach dem Wickelvorgang wird die Stromschiene dadurch zusammengesetzt, dass die Halteteile mittels des Verbindungsteils elektrisch leitend verbunden werden. The German patent application DE 10 2014201 637 A1 relates to a method for producing a stator which has several stator poles and at least one busbar for electrically connecting the ends of the windings of different stator poles. The busbar is constructed in several parts and has several holding parts, on each of which at least one winding wire can be fixed. After the winding process, the busbar is put together in that the holding parts are connected in an electrically conductive manner by means of the connecting part.
Die europäische Patentschrift EP 3 300218 B1 betrifft einen Kontaktring zur Anordnung an einem Stator eines elektronisch kommutierten Elektromotors. Der Kontaktring ist aus zumindest zwei Paaren identischer, teilringförmiger, metallischer Elemente ausgebildet. Jedes der Paare ist dabei mit einer Anschlussfahne zur Anbindung an einer Spannungsquelle verbunden. Die Anschlussfahnen benötigen viel axialen Bauraum.The European patent EP 3 300218 B1 relates to a contact ring for arrangement on a stator of an electronically commutated electric motor. The contact ring is formed from at least two pairs of identical, partially ring-shaped, metallic elements. Each of the pairs is connected to a terminal lug for connection to a voltage source. The connection lugs require a lot of axial installation space.
In vielen industriellen Anwendungen und zunehmend auch in der Automobilindustrie werden permanenterregte Synchronmaschinen (PSM) eingesetzt. Eine solche PSM- Maschine besteht aus einem zu bestromenden Stator und einem permanenterregten Rotor. Der Stator besteht zumindest aus Statorwicklungen (Drahtwicklungen), einem Statorträger, einem Verschaltungsring und einem Terminal zur Leistungselektronik. Permanent magnet synchronous machines (PSM) are used in many industrial applications and increasingly also in the automotive industry. Such a PSM machine consists of a stator to be energized and a permanently excited rotor. The stator consists at least of stator windings (wire windings), a stator carrier, a connection ring and a terminal for power electronics.
Elektrische Maschinen mit konzentrierter Wicklung besitzen eine unterschiedliche Anzahl an sog. Statorzähnen. In der Regel bilden drei aufeinanderfolgende Zähne ein Polpaar. Für elektrische Maschinen mit konzentrierter Wicklung und Sternverschaltung müssen die einzelnen Polpaare, also bspw. drei Zähne, miteinander gekoppelt bzw. elektrisch verbunden werden. Die Realisierung und Zugänglichkeit dieses Sternpunktes wird oft durch den Bauraum begrenzt. Gemäß dem Stand der Technik gibt es unterschiedliche Möglichkeiten, die Verschaltung zu realisieren. Eine übliche Art und Weise ist, die beiden Enden eines Ringleiters mit einer Stromschiene zu verbinden. Dabei bedarf es einer hohen Positionierungsgenauigkeit, genauere Einzelteiltoleranzen und mehrere Schweiß- und Verbindungsstellen. Aufgabe der Erfindung ist es daher, eine elektrische Kontaktierung eines Stators einer elektrischen Maschine durch eine Ausführung des Verschaltungsringes zu schaffen, so dass die Kontaktierung und die Montage der Stromschiene und des zugehörigen Ringleiters erheblich vereinfacht werden kann, so dass die Prozesse verschlankt, Prozesszeiten verkürzt und Kosten eingespart werden. Diese Aufgabe wird gelöst durch eine elektrische Kontaktierung eines Stators einer elektrischen Maschine, die die Merkmale des Anspruchs 1 umfasst. Electrical machines with concentrated windings have a different number of so-called stator teeth. As a rule, three consecutive teeth form one Pole pair. For electrical machines with concentrated winding and star connection, the individual pole pairs, for example three teeth, must be coupled to one another or electrically connected. The implementation and accessibility of this star point is often limited by the installation space. According to the prior art, there are different options for implementing the interconnection. A common way is to connect the two ends of a ring conductor to a busbar. This requires a high level of positioning accuracy, more precise individual part tolerances and several welding and connection points. The object of the invention is therefore to create electrical contacting of a stator of an electrical machine through an embodiment of the interconnection ring, so that the contacting and assembly of the busbar and the associated ring conductor can be considerably simplified, so that the processes are streamlined, process times are shortened and Costs can be saved. This object is achieved by making electrical contact with a stator of an electrical machine, which comprises the features of claim 1.
Die erfindungsgemäße elektrische Kontaktierung des Stators der elektrischen Maschine wird dadurch erreicht, dass die Enden eines jeden Ringleiters in Umfangrichtung überlappen und miteinander fest verbunden sind. Ein Flachstück der entsprechenden Stromschiene ist mit den überlappenden Enden des entsprechenden Ringleiters verbunden. The electrical contacting according to the invention of the stator of the electrical machine is achieved in that the ends of each ring conductor overlap in the circumferential direction and are firmly connected to one another. A flat piece of the corresponding busbar is connected to the overlapping ends of the corresponding ring conductor.
Die erfindungsgemäße Kontaktierung hat den Vorteil, dass elektrische Verluste deutlich verringert werden, da die Anzahl der Verbindungsstellen (Schweißstellen) reduziert ist. Hinzu kommt, dass Kontaktfläche der Verbindung zwischen dem Ringleiter und dem Flachstück der entsprechenden Stromschiene deutlich erhöht ist. Gemäß einer vorteilhaften Ausgestaltung der Erfindung ist die Verbindung eines jeden Ringleiters an dessen Enden mittels einer Schweißnaht ausgeführt. Ebenso kann die Verbindung des Flachstücks der entsprechenden Stromschiene mit den überlappenden Enden des entsprechenden Ringleiters mittels einer Schweißnaht ausgeführt sein. The contacting according to the invention has the advantage that electrical losses are significantly reduced since the number of connection points (weld points) is reduced. In addition, the contact area of the connection between the ring conductor and the flat piece of the corresponding busbar is significantly increased. According to an advantageous embodiment of the invention, the connection of each ring conductor is carried out at its ends by means of a weld seam. The connection of the Flat piece of the corresponding busbar can be executed with the overlapping ends of the corresponding ring conductor by means of a weld seam.
Die kleinen Kontaktbereiche (Schweißstellen) der elektrischen Kontaktierung nach dem Stand der Technik führen aufgrund der Verluste zu Hotspots. Dies bedeutet, dass in diesen Bereichen hohe Temperaturen auftreten, was zu den Verlusten führt. The small contact areas (welding points) of the electrical contact according to the prior art lead to hotspots due to the losses. This means that high temperatures occur in these areas, which leads to the losses.
Jeder Ringleiter hat an jedem Ende einen S-Schlag ausgebildet. Durch den Schlag können die beiden Enden in axialer Richtung überlappend angeordnet werden. Jede Stromschiene hat eine Kröpfung ausgebildet, so dass eine Gewindebuchse jeder Stromschiene von dem Ringleiter unter einem Abstand in axialer Richtung angeordnet ist. Each ring conductor has an S-shaped section at each end. As a result of the impact, the two ends can be arranged so as to overlap in the axial direction. Each busbar has an offset so that a threaded bushing of each busbar is arranged at a distance in the axial direction from the ring conductor.
Die gemäß der Erfindung gestalteten Stromschienen können deutlich einfacher ausgeführt werden. Der Kontaktierungsbereich zu dem Ringleitern ist flach ausgeführt und verzeiht somit große Toleranzabweichungen. Ebenfalls lassen sich durch den flachen Kontaktierungsbereich die Herstellungskosten reduzieren, da weniger Fertigungsaufwand, wie z. B. Biege-Operationen bei der Ausbildung derThe busbars designed according to the invention can be made much simpler. The contact area to the ring conductors is flat and therefore forgives large tolerance deviations. The manufacturing costs can also be reduced by the flat contacting area, since less manufacturing effort, such as, for. B. Bending operations in the training of the
Flächenelemente der Stromschienen des Standes der Technik, erforderlich ist. Surface elements of the busbars of the prior art, is required.
Hinzu kommt, dass gemäß der Erfindung der Bauraum im Bereich der Kontaktierung (zwischen Stromschiene und Ringleiter) erheblich reduziert werden kann. Diese Optimierung kommt auch einem Isolierprozess zu Gute, da der Bereich nun einfacher zugänglich ist und somit einfacher in einen Isolierprozess integriert werden kann. In addition, according to the invention, the installation space in the area of the contact (between busbar and ring conductor) can be reduced considerably. This optimization also benefits an insulation process, since the area is now more easily accessible and can therefore be more easily integrated into an insulation process.
Ebenfalls kann gemäß der Erfindung der Stromschluss optimiert werden. The current circuit can also be optimized according to the invention.
Anhand der beigefügten Zeichnungen werden nun die Erfindung und ihre Vorteile durch Ausführungsbeispiele näher erläutert, ohne dadurch die Erfindung auf das gezeigte Ausführungsbeispiel zu beschränken. Die Größenverhältnisse in den Figuren entsprechen nicht immer den realen Größenverhältnissen, da einige Formen vereinfacht und andere Formen zur besseren Veranschaulichung vergrößert im Verhältnis zu anderen Elementen dargestellt sind. Figur 1 zeigt eine perspektivische Draufsicht auf ein Statorende, an demWith reference to the accompanying drawings, the invention and its advantages will now be explained in more detail by means of exemplary embodiments, without thereby restricting the invention to the exemplary embodiment shown. The proportions in the figures do not always correspond to the real proportions, since some shapes are simplified and other shapes are shown enlarged in relation to other elements for better illustration. Figure 1 shows a perspective top view of a stator end on which
Stromschienen, gemäß dem Stand der Technik, die Ringleiter verbinden. Busbars, according to the prior art, connect the ring conductors.
Figur 2 zeigt eine vergrößerte perspektivische Ansicht der Zuordnung einer der Stromschienen zum jeweiligen Ringleiter gemäß dem Stand der Technik. Figur 3 zeigt eine perspektivische Ansicht der elektrisch leitenden Verbindung der Stromschienen mit dem jeweiligen Ringleiter gemäß dem Stand der Technik. FIG. 2 shows an enlarged perspective view of the assignment of one of the busbars to the respective ring conductor according to the prior art. Figure 3 shows a perspective view of the electrically conductive connection of the busbars with the respective ring conductor according to the prior art.
Figur 4 zeigt eine perspektivische Ansicht eines Ringleiters gemäß der Erfindung. FIG. 4 shows a perspective view of a ring conductor according to the invention.
Figur 5 zeigt eine perspektivische Ansicht der erfindungsgemäßen Zuordnung und Verbindung einer der Stromschienen mit dem jeweiligen Ringleiter. FIG. 5 shows a perspective view of the assignment and connection according to the invention of one of the busbars with the respective ring conductor.
Figur 6 zeigt eine Seitenansicht einer Stromschiene, die gemäß der Erfindung mit dem Ringleiter verbunden ist. FIG. 6 shows a side view of a busbar which is connected to the ring conductor according to the invention.
Figur 7 zeigt eine Seitenansicht einer Stromschiene, die gemäß dem Stand der Technik mit dem Ringleiter verbunden ist. Für gleiche oder gleich wirkende Elemente der Erfindung werden identischeFIG. 7 shows a side view of a busbar which is connected to the ring conductor according to the prior art. Identical elements are used for elements of the invention which are the same or have the same effect
Bezugszeichen verwendet. Ferner werden der Übersicht halber nur Bezugszeichen in den einzelnen Figuren dargestellt, die für die Beschreibung der jeweiligen Figur erforderlich sind. Die Figuren stellen lediglich Ausführungsbeispiele der Erfindung dar, ohne jedoch die Erfindung auf die dargestellten Ausführungsbeispiele zu beschränken. Figur 1 zeigt eine perspektivische Draufsicht auf ein Statorende 10, an dem eine erste, zweite und dritte Stromschiene 1 , 2 und 3, gemäß dem Stand der Technik, mit den entsprechenden ersten, zweiten und dritten Ringleitern 11 , 12 und 13 elektrisch leitend verbunden sind. Die ersten, zweiten und dritten Ringleiter 11 , 12 und 13 haben zwei in axialer Richtung A abstehende Enden 15 ausgebildet, die zur elektrischen Kontaktierung mit der entsprechenden ersten, zweiten bzw. dritten Stromschiene 1 , 2 und 3 verbunden werden. Die ersten, zweiten und dritten Ringleiter 11 , 12 und 13 führen zu den einzelnen Statorwicklungen (nicht dargestellt). Den Ringleitern 11 , 12 und 13 ist ferner eine dezentrale Sternverschaltung 14 zugeordnet. Reference numerals used. Furthermore, for the sake of clarity, only reference symbols are shown in the individual figures which are necessary for the description of the respective figure. The figures merely represent exemplary embodiments of the invention without, however, restricting the invention to the illustrated exemplary embodiments. Figure 1 shows a perspective top view of a stator end 10, on which a first, second and third busbar 1, 2 and 3, according to the prior art, are electrically conductively connected to the corresponding first, second and third ring conductors 11, 12 and 13 . The first, second and third ring conductors 11, 12 and 13 have two ends 15 protruding in the axial direction A, which are connected to the corresponding first, second and third busbars 1, 2 and 3 for electrical contacting. The first, second and third ring conductors 11, 12 and 13 lead to the individual stator windings (not shown). A decentralized star connection 14 is also assigned to the ring conductors 11, 12 and 13.
Figur 2 zeigt eine vergrößerte perspektivische Ansicht der Zuordnung einer der Stromschienen 1 , 2 oder 3 zum jeweiligen Ringleiter 11 , 12 bzw. 13 gemäß dem Stand der Technik. In Figur 2 ist lediglich der dritte Ringleiter 13 dargestellt, der mit der dritten Stromschiene 3 verbunden ist. Jede der Stromschienen 1 , 2 und 3 trägt im Bereich eines ersten Endes 4 eine Gewindebuchse 6, mit der elektrische Leiter (nicht dargestellt) verbunden werden können. Im Bereich eines zweiten Endes 5 hat jede der Stromschienen 1 , 2 und 3 Flächenelemente 8 ausgebildet, die ebenfalls in axialer Richtung A von der Stromschiene 1 , 2 oder 3 abstehen. Über die Flächenelemente 8 werden die Stromschienen 1 , 2 oder 3 mit den beiden Enden 15 der Ringleiter 11 , 12 oder 13, die sich ebenfalls in axialer Richtung A erstecken, verbunden. FIG. 2 shows an enlarged perspective view of the assignment of one of the busbars 1, 2 or 3 to the respective ring conductor 11, 12 or 13 according to the prior art. In FIG. 2, only the third ring conductor 13 is shown, which is connected to the third busbar 3. Each of the busbars 1, 2 and 3 has a threaded bushing 6 in the area of a first end 4, with which electrical conductors (not shown) can be connected. In the region of a second end 5, each of the busbars 1, 2 and 3 has surface elements 8 which also protrude in the axial direction A from the busbar 1, 2 or 3. The busbars 1, 2 or 3 are connected to the two ends 15 of the ring conductors 11, 12 or 13, which also extend in the axial direction A, via the surface elements 8.
Figur 3 zeigt eine perspektivische Ansicht der elektrisch leitenden Verbindung der dritten Stromschiene 3 mit dem jeweiligen dritten Ringleiter 13 gemäß dem Stand der Technik. Gemäß dem Stand der Technik gibt es unterschiedliche Möglichkeiten, die Verschaltung der Ringleiter 11 , 12 und 13 zu realisieren. Eine übliche Art und Weise ist, wie hier dargestellt, dass die beiden Enden 15 eines Ringleiters 11 , 12 oder 13 (hier der dritte Ringleiter 13) mit der entsprechenden Stromschiene 1 , 2 oder 3 (hier die dritte Stromschiene 3) verbunden werden. Die beiden Enden 15 des dritten Ringleiters 13 werden über Schweißnähte 16 mit den Flächenelementen 8 der dritten Stromschiene 3 verbunden. Dabei bedarf es einer hohen Positionierungsgenauigkeit, genauer Einzelteiltoleranz und mehrerer Schweiß- bzw. Verbindungsstellen. Figure 3 shows a perspective view of the electrically conductive connection of the third busbar 3 with the respective third ring conductor 13 according to the prior art. According to the state of the art, there are different ways of realizing the interconnection of the ring conductors 11, 12 and 13. A common way, as shown here, is that the two ends 15 of a ring conductor 11, 12 or 13 (here the third ring conductor 13) are connected to the corresponding busbar 1, 2 or 3 (here the third busbar 3). The two ends 15 of the third ring conductor 13 are connected to the surface elements 8 of the third busbar 3 via weld seams 16. This requires a high level of positioning accuracy, precise individual part tolerance and several welding or connection points.
Diese Verbindung aus Ringleiter 11 , 12 oder 13 und entsprechenden Stromschienen 1 ,This connection of ring conductor 11, 12 or 13 and corresponding busbars 1,
2 oder 3 steht in axialer Richtung A hervor. Es lässt sich leicht erkennen, dass diese Verbindung eine sehr hohe Positionierungsgenauigkeit fordert, um beide Enden 15 mit den entsprechenden Flächenelementen 8 sauber und sicher zu verbinden. Die beiden Enden 15 des Ringleiters 11 , 12 oder 13 werden separat an die Stromschiene 1 , 2 oder2 or 3 protrudes in the axial direction A. It can easily be seen that this connection requires very high positioning accuracy in order to connect both ends 15 to the corresponding surface elements 8 cleanly and securely. The two ends 15 of the ring conductor 11, 12 or 13 are separately connected to the busbar 1, 2 or
3 kontaktierend angebunden. Somit entstehen zwei Schweißstellen 16. Es gilt, je höher die Anzahl der Schweißstellen 16 für den Übergang von der Stromschiene 1 , 2 oder 3 in den Ringleiter 11 , 12 oder 13, desto höher die Verluste. 3 connected in a contacting manner. This results in two welds 16. It applies, the higher the number of welds 16 for the transition from the busbar 1, 2 or 3 to the ring conductor 11, 12 or 13, the higher the losses.
Figur 4 zeigt die Ausgestaltung eines Ringleiters 11 , 12 oder 13, wie er bei der gegenwärtigen Erfindung Verwendung findet. Bei der erfindungsgemäßen Ausgestaltung des Ringleiters 11 , 12 oder 13 sind die beiden Enden 15 derart ausgebildet, dass sie in Umfangsrichtung U überlappen. FIG. 4 shows the configuration of a ring conductor 11, 12 or 13 as used in the present invention. In the embodiment of the ring conductor 11, 12 or 13 according to the invention, the two ends 15 are designed in such a way that they overlap in the circumferential direction U.
Figur 5 zeigt eine perspektivische Ansicht der erfindungsgemäßen Zuordnung und Verbindung einer der Stromschienen 1 , 2 oder 3 mit dem jeweiligen Ringleiter 11 , 12 oder 13. Die beiden Enden 15 eines jeden Ringleiters 11 , 12 oder 13 sind über eine Schweißnaht 16 miteinander verbunden. Jeder der Ringleiter 11 , 12 oder 13 hat hierzu an den beiden Enden 15 jeweils einen S-Schlag 20 (siehe Figur 4) ausgebildet. Dadurch lassen sich beide Enden 15 übereinanderlegen und können beispielsweise durch eine Schweißnaht 16 verbunden werden. Es ist für einen Fachmann selbstverständlich, dass die Möglichkeit der Verbindung durch eine Schweißnaht 16 nur eine von mehreren Möglichkeiten ist. Für die Verbindung der beiden Enden 15 eines jeden der Ringleiter 11 , 12 oder 13 wäre z.B. auch ein Verkleben mit einem leitenden Kleber denkbar. FIG. 5 shows a perspective view of the assignment and connection according to the invention of one of the busbars 1, 2 or 3 with the respective ring conductor 11, 12 or 13. The two ends 15 of each ring conductor 11, 12 or 13 are connected to one another via a weld 16. For this purpose, each of the ring conductors 11, 12 or 13 has an S-shaped section 20 (see FIG. 4) at each of the two ends 15. As a result, both ends 15 can be placed one on top of the other and can be connected, for example, by a weld 16. It goes without saying for a person skilled in the art that the possibility of a connection by means of a weld 16 is only one of several possibilities. For the connection of the two ends 15 of each of the ring conductors 11, 12 or 13, gluing with a conductive adhesive would also be conceivable, for example.
Das zweite Ende 5 der Stromschienen 1 , 2 oder 3 ist als Flachstück 9 ausgebildet. Das Flachstück 9 der Stromschienen 1 , 2 oder 3 kann mit den beiden verbundenen Enden 15 des Ringleiters 11 , 12 oder 13 ebenfalls mittels einer Schweißnaht 16 verbunden werden. Mit diesem speziellen Aufbau kann der axiale Aufbau deutlich verringert, die Positionsgenauigkeit erhöht und die Montage erheblich verbessert werden. The second end 5 of the busbars 1, 2 or 3 is designed as a flat piece 9. The flat piece 9 of the busbars 1, 2 or 3 can also be connected to the two connected ends 15 of the ring conductor 11, 12 or 13 by means of a weld 16. With this special structure, the axial structure can be significantly reduced, the positional accuracy can be increased and the assembly can be considerably improved.
Jede der Stromschienen 1 , 2 oder 3 weist eine Kröpfung 7 auf. Mittels der Kröpfung 7 ist die Gewindebuchse 6 am ersten Ende 4 der Stromschiene 1 , 2 oder 3 von den Ringleitern 11 , 12 oder 13 durch einen Abstand B in axialer Richtung A beabstandet. Figur 6 zeigt eine Seitenansicht einer Stromschiene 1 , 2 oder 3, die gemäß der Erfindung mit dem Ringleiter 11 , 12 oder 13 verbunden ist. Figur 7 zeigt eine Seitenansicht einer Stromschiene 1 , 2 oder 3, die gemäß dem Stand der Technik mit dem Ringleiter 11 , 12 oder 13 verbunden ist. Aus dem Vergleich der Figur 6 und der Figur 7 erkennt man, dass der Bauraum im Bereich der Kontaktierung von der Stromschiene 1 , 2 oder 3 mit dem Ringleiter 11 , 12 oder 13 erheblich reduziert werden kann. So erstreckt sich das Flachstück 9 der erfindungsgemäßen Ausgestaltung der Stromschiene 1 , 2 oder 3 nicht in die axiale Richtung A (siehe Fig.6), was Bauraum in der axialen Richtung A einspart. Each of the busbars 1, 2 or 3 has an offset 7. By means of the crank 7, the threaded bush 6 at the first end 4 of the busbar 1, 2 or 3 is spaced apart from the ring conductors 11, 12 or 13 by a distance B in the axial direction A. FIG. 6 shows a side view of a busbar 1, 2 or 3 which is connected to the ring conductor 11, 12 or 13 according to the invention. FIG. 7 shows a side view of a busbar 1, 2 or 3 which is connected to the ring conductor 11, 12 or 13 according to the prior art. From the comparison of Figure 6 and FIG. 7 shows that the installation space in the area of the contact between the busbar 1, 2 or 3 with the ring conductor 11, 12 or 13 can be reduced considerably. The flat piece 9 of the embodiment of the busbar 1, 2 or 3 according to the invention does not extend in the axial direction A (see FIG. 6), which saves installation space in the axial direction A.
Bei der Stromschiene 1 , 2 oder 3 des Standes der Technik erstecken sich die Flächenelemente 8 in die axiale Richtung A und beanspruchen folglich Bauraum in der axialen Richtung A (siehe Fig. 7). In the case of the busbar 1, 2 or 3 of the prior art, the surface elements 8 extend in the axial direction A and consequently take up installation space in the axial direction A (see FIG. 7).
Es wird angenommen, dass die vorliegende Offenbarung und viele der darin erwähnten Vorteile durch die vorhergehende Beschreibung verständlich werden. Es ist offensichtlich, dass verschiedene Änderungen in Form, Konstruktion und Anordnung der Bauteile durchgeführt werden können, ohne von dem offenbarten Gegenstand abzuweichen. Die beschriebene Form ist lediglich erklärend, und es ist die Absicht der beigefügten Ansprüche, solche Änderungen zu umfassen und einzuschließen. Dementsprechend sollte der Umfang der Erfindung nur durch die beigefügten Ansprüche beschränkt sein. It is believed that the present disclosure and many of the advantages noted therein will be understood from the preceding description. Obviously, various changes in the shape, construction and arrangement of the components can be made without departing from the disclosed subject matter. The form described is illustrative only and it is the intent of the appended claims to embrace and incorporate such changes. Accordingly, the scope of the invention should be limited only by the appended claims.
BezugszeichenlisteList of reference symbols
1
Figure imgf000010_0001
1
Figure imgf000010_0001
2
Figure imgf000010_0002
2
Figure imgf000010_0002
3 dritte Stromschiene 3 third busbar
4 erstes Ende 4 first end
5 zweites Ende 5 second end
6 Gewindebuchse 6 threaded bushing
7 Kröpfung 7 crank
8 Flächenelement 8 surface element
9 Flachstück 9 flat piece
10 Statorende 10 stator end
11 erster Ringleiter 11 first ring conductor
12 zweiter Ringleiter 12 second ring conductor
13 dritter Ringleiter 13 third ring conductor
14 Sternverschaltung 14 Star connection
15 Ende Ringleiter 15 End of ring conductor
16 Schweißnaht 16 weld seam
20 S-Schlag 20 S-beat
A Axiale Richtung A Axial direction
B Abstand B distance
U Umfangsrichtung U circumferential direction

Claims

Patentansprüche Claims
1. Elektrische Kontaktierung eines Stators einer elektrischen Maschine mit: drei Ringleitern (11 , 12, 13), die an einem Statorende (10) angeordnet sind und drei Stromschienen (1 , 2, 3), wobei je eine der Stromschienen (1 , 2, 3) mit je einem der Ringleiter (11 , 12, 13) elektrisch leitend über Enden (15) der Ringleiter (11 , 12, 13) verbunden ist, dadurch gekennzeichnet, 1. Electrical contacting of a stator of an electrical machine with: three ring conductors (11, 12, 13) which are arranged at one end of the stator (10) and three busbars (1, 2, 3), one of the busbars (1, 2 , 3) is connected to one of the ring conductors (11, 12, 13) in an electrically conductive manner via ends (15) of the ring conductors (11, 12, 13), characterized in that,
- dass die Enden (15) eines jeden Ringleiters (11 , 12, 13) in Umfangrichtung (U) überlappen und miteinander fest verbunden sind; und - dass ein Flachstück (9) der entsprechenden Stromschiene (1 , 2, 3) mit den überlappenden Enden (15) des entsprechenden Ringleiters (11 , 12, 13) verbunden ist. - That the ends (15) of each ring conductor (11, 12, 13) overlap in the circumferential direction (U) and are firmly connected to one another; and - that a flat piece (9) of the corresponding busbar (1, 2, 3) is connected to the overlapping ends (15) of the corresponding ring conductor (11, 12, 13).
2. Elektrische Kontaktierung nach Anspruch 1 , wobei die Enden (15) eines jeden Ringleiters (11 , 12, 13) mittels einer Schweißnaht (16) miteinander verbunden sind. 2. Electrical contact according to claim 1, wherein the ends (15) of each ring conductor (11, 12, 13) are connected to one another by means of a weld seam (16).
3. Elektrische Kontaktierung nach Anspruch 1 , wobei das Flachstück (9) der entsprechenden Stromschiene (1 , 2, 3) mit den überlappenden Enden (15) des entsprechenden Ringleiters (11 , 12, 13) mittels einer Schweißnaht (16) verbunden ist. 3. Electrical contact according to claim 1, wherein the flat piece (9) of the corresponding busbar (1, 2, 3) is connected to the overlapping ends (15) of the corresponding ring conductor (11, 12, 13) by means of a weld seam (16).
4. Elektrische Kontaktierung nach einem der vorangegangenen Ansprüche, wobei jeder Ringleiter (11 , 12, 13) an jedem Ende (15) einen S-Schlag (20) ausgebildet hat, wodurch die beiden Enden (15) in axialer Richtung überlappend anordenbar sind. 4. Electrical contact according to one of the preceding claims, wherein each ring conductor (11, 12, 13) at each end (15) has an S-shaped section (20), whereby the two ends (15) can be arranged overlapping in the axial direction.
5. Elektrische Kontaktierung nach einem der vorangegangenen Ansprüche, wobei jede Stromschiene (1 , 2, 3) eine Kröpfung (7) ausgebildet hat, so dass eine5. Electrical contact according to one of the preceding claims, wherein each busbar (1, 2, 3) has a crank (7) formed so that one
Gewindebuchse (6) jeder Stromschiene (1 , 2, 3) von dem Ringleiter (11 , 12, 13) einen Abstand (B) in axialer Richtung (A) besitzt. The threaded bushing (6) of each busbar (1, 2, 3) is at a distance (B) from the ring conductor (11, 12, 13) in the axial direction (A).
PCT/DE2021/100301 2020-04-20 2021-03-26 Electrical contacting of a stator of an electrical machine WO2021213583A1 (en)

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