EP4010963A1 - Machine électrique - Google Patents

Machine électrique

Info

Publication number
EP4010963A1
EP4010963A1 EP20746548.5A EP20746548A EP4010963A1 EP 4010963 A1 EP4010963 A1 EP 4010963A1 EP 20746548 A EP20746548 A EP 20746548A EP 4010963 A1 EP4010963 A1 EP 4010963A1
Authority
EP
European Patent Office
Prior art keywords
conductors
electrical machine
winding
machine according
conductor
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.)
Pending
Application number
EP20746548.5A
Other languages
German (de)
English (en)
Inventor
Andreas Ruppert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP4010963A1 publication Critical patent/EP4010963A1/fr
Pending legal-status Critical Current

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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/04—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of windings prior to their mounting into the machines
    • H02K15/0414—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of windings prior to their mounting into the machines the windings consisting of separate elements, e.g. bars, segments or half coils
    • H02K15/0421—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of windings prior to their mounting into the machines the windings consisting of separate elements, e.g. bars, segments or half coils and consisting of single conductors, e.g. hairpins
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • 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
    • H02K3/48—Fastening of windings on the stator or rotor structure in slots
    • 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
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225—Terminal boxes or connection arrangements
    • 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
    • H02K2203/06—Machines characterised by the wiring leads, i.e. conducting wires for connecting the winding terminations
    • 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 an electrical machine, comprising a stator with a winding comprising a plurality of conductors assigned to one or more phases, which are interconnected.
  • Electrical machines comprising a rotor and a stator are used in different areas of application.
  • the use of electrical machines for electric hybrid vehicles and electric vehicles or for hub drives is only mentioned as an example. If such an electrical machine is used as a drive machine, it is mostly designed as an internal rotor, which means that the stator surrounds the internal rotor. A wandering magnetic field is generated via the stator, which causes the rotor to rotate.
  • the stator has a winding consisting of a multiplicity of conductors, the conductors being assigned to one or usually several phases.
  • circumferential conductors To form quasi-meandering, circumferential conductors, they are to be connected accordingly at their ends, which is usually done by welding the conductor ends that are adjacent to one another.
  • the conductor ends converge at one point or one winding side in the form of a so-called star, where they are connected to one another.
  • the connection of the individual phases to an external power supply i.e. a power connection that is used to generate the magnetic field, must be made, which is often very complicated to implement for reasons of space.
  • the invention is based on the problem of specifying a comparatively improved electrical cal machine.
  • the invention provides for an electrical machine of the type mentioned at the outset that the ends of at least part of the conductors protrude beyond the winding, some of these ends being connected to an interconnection ring placed axially on the winding and another part being connected to the These ends are connected to a power connection arranged radially outside the winding via connecting conductors, the connecting conductors being fixed to at least one holding element provided on the interconnection ring.
  • the actual conductor connection that is, the connection of the individual conductors to form the corresponding phase-specific meander structures, and the connection for coupling to the power supply to be separated via a high-voltage terminal.
  • a circuit ring is used for the actual conductor connection, i.e. a conductor ring that is placed axially on the winding and forms the star point of the electrical machine and where all phases, mostly three phases, converge.
  • This conductor ring engages in the area of the protruding conductor ends, whereby the conductor ends can protrude axially on the inner circumference and / or on the outer circumference of the winding, i.e.
  • connection ring when the connection ring is axially placed, the conductor ends protruding radially between the area of the inner and outer circumference of the winding intervenes.
  • the conductor ends are the individual conductor sections, unless they are on other, z. B. further inner radial planes are connected to each other, assigned.
  • the conductor ends are connected to the interconnection ring, usually welded accordingly, so that the corresponding phase-specific conductor structures or conductor connections are generated via the interconnection ring.
  • connection conductors are provided which phase-specifically the conductor ends protruding beyond the winding with the corresponding phase-specific contact areas of the power connection or connect the HV terminal.
  • These connecting conductors have a certain length after the power connection and thus the corresponding contact areas on the local side and the protruding ends of the stator on the other side are spaced apart due to the separation of the connection ring and the power connection.
  • the invention provides that the connecting conductors are fixed to at least one retaining element provided on the interconnection ring.
  • the connecting conductors are not only connected to the conductor ends on the one hand and the contact areas on the other hand via their own contact points, i.e. welded connections, but are also fixed over their length to at least one holding element provided on the interconnection ring. This enables a sufficiently rigid connection of the connection conductors to or within the machine; on the other hand, the conductor configuration is still flexible enough to be able to compensate for any vibrations in the drive train.
  • connection ring and power supply terminal i.e. the high-voltage connection
  • the assembly is also simplified, since the conductors or wires to be connected via the interconnection ring le diglich cut to length and brought into the appropriate position when plugging the winding cage to be connected to the corresponding connection terminals of the interconnection ring, which of course are positioned accordingly. Both cutting to length and, of course, putting together can follow in an automated assembly process, as can of course also be compensated for due to the simple connection of conductor ends and interconnection ring.
  • connection ring and the power supply or the HV terminal are two separate assemblies that are connected to the stator and then also to the finished electrical machine in different process steps.
  • additional fixing of the connection conductors according to the invention allows at least one interconnection ring-side retaining element of a secure, but still sufficiently flexible conductor routing so that it is ensured that they do not have any during operation are subject to strong oscillations or vibrations, which can have a detrimental effect on their welded contact connections, but are still sufficiently flexible to be able to compensate for any oscillations or vibrations.
  • the connecting conductors can have a considerable length and, for example, run around a circumferential angle of up to 90 °, several holding elements spaced apart in the circumferential direction can be provided on the interconnection ring, so that the connecting conductors can be connected to two or more Holding elements are fixed.
  • connection ring itself expediently has a housing on which the retaining element or elements are arranged.
  • Corresponding separate line bridges are included in this housing, which are connected to the ends of the conductors, connecting them to the corresponding meandering structure.
  • These line bridges which are appropriately stable metal sheets, which are geometrically shaped so that they reach the corresponding conductors to be connected, are grouped into the corresponding circuit ring and enable easy bridging of corresponding distances both in circumferential and circumferential dimensions also in the radial direction.
  • These cable bridges like the individual conductors and connecting conductors, are of course insulated from one another.
  • connection sections to which the ends of the Lei ter that protrude from the winding are welded.
  • the cable bridges are arranged radially and axially offset from one another and nested as closely as possible, the geometric design of the individual conductor bridges always taking into account the winding geometry, as well as the position of the conductor ends to be connected.
  • a corresponding housing is provided according to the invention which, for example, Che has openings through which the connection sections protrude.
  • the interconnection ring is suitably housed and consequently can be placed axially on the winding cage as a fully assembled unit and positioned in relation to the conductor ends.
  • the Hal teieri or are arranged on this housing, that is, this housing is therefore multifunctional and not only serves to form the interconnection ring or the housing of the cable bridges, but also as a carrier of the Hal teimplantation (s) and thus as Place of attachment.
  • the holder element or elements are therefore not to be attached to any more or less undefined areas in the area of the winding overhangs, but can be provided at defined positions on the connection ring or its housing.
  • the or each holding element is preferably designed as a latching or clamping element on which one or more connecting conductors are fixed via a latching or Klemmver connection.
  • This design of the or each holding element as a latching or clamping element enables simple fixation or connection of the connecting conductor to the corresponding holding element. This is because the connecting conductor can be fastened to it in a simple manner via a latching or clamping connection, that is to say that additional fastening means are not required.
  • the or each locking or clamping element can have one or more axially or radially open U-shaped receptacles for locking or clamping fixation.
  • the respective connec tion conductor is therefore introduced into the open U-shaped receptacle and fixed there by locking or by clamping.
  • the U-shaped receptacle can be axially open, which means that the connection conductor or conductors can be pushed in axially from the free winding head side and can thus be locked or clamped.
  • one leg of this U-shaped receptacle can be flexible and clamp the connecting conductor or conductors in the receptacle. So here is a de- Speaking flexible or elastic clamping fixation is realized in that the connection conductor or conductors are tensioned via the flexible leg against an abutment, that is to say an opposite leg or housing section. This can be a purely radial bracing, but bracing with a tangential or axial component is also conceivable.
  • the flexible leg is slotted one or more times to form separate flexible leg sections.
  • the holding element extends a certain distance around the circumference of the winding, it is expedient to form two or more elastic leg sections so that a geometrically more flexible adaptation and thus tensioning results.
  • a locking fixation is to take place, which prevents the connecting conductor or conductors from slipping out of the U-shaped receptacle again, it is useful if at least on the flexible leg or on one or all of the flexible leg sections a latching projection is provided on or behind which the connecting conductor or conductors latch.
  • This locking projection engages over, for example, the connection conductor or conductors introduced into the U-shaped receptacle in the fixing position, so that in the unlikely event they would move axially against the locking projection and this would limit further movement.
  • the or each holding element can have one or more radially open latching or clamping receptacles.
  • a connec tion conductor engages, wherein in the case of a latching receptacle the or each latching receptacle we have at least one latching projection on or behind which the respective connection conductor latches.
  • the connecting conductors are inserted axially, based on the axis of rotation, the connecting conductors are clamped or clipped in radially from the side here.
  • the or each holding element is either designed as a pure clamping receptacle, that is, a pure clamping fixation is provided.
  • a latching fixation can also be provided, the or each latching receptacle having a corresponding latching projection.
  • the holding element or elements are attached to the housing. It is particularly preferred here to make the housing from plastic and to form the holding element or elements in one piece thereon. This means that the housing is a simple plastic injection-molded part on which not only the geometries required to accommodate the line bridges are formed, but at the same time also the holding element (s) regardless of the specific geometrical configuration.
  • FIG. 1 shows a basic illustration in the form of a partial view of an electrical machine according to the invention
  • FIG. 2 shows a further basic illustration corresponding to FIG. 1, showing the complete interconnection ring
  • FIG. 3 is an enlarged partial view from FIG. 1 showing a retaining element formed on the connecting ring housing
  • FIG. 4 shows an enlarged perspective view of the retaining element from FIG. 3 without a connecting conductor
  • FIG. 5 shows a perspective view of a connection ring in a further embodiment.
  • FIG. 1 shows, in the form of a partial view, a basic diagram of an electrical machine 1 according to the invention comprising a stator 2 with a winding 3 with a plurality of conductors 4, which are assigned to separate phases in the example shown.
  • Each conductor 4 is practically designed as a U-shaped bracket, a plurality of such U-shaped conductors 4, often also called hairpins, being plugged together to form the winding 3, which can also be referred to as a winding basket.
  • the multitude of conductors 4 define different radial planes R, as shown in FIG.
  • the conductors 4 extend, depending on the winding scheme, from one radial plane R to another radial plane R, for example an adjacent radial plane R, in the area in which they are connected to the conductor ends of corresponding adjacent conductors that continue the phase conductor.
  • the conductors 4 are guided or bent and laid in such a way that they result in corresponding recesses that extend radially so that corresponding stator teeth 5 engage in these recesses or the corresponding conductors 4 are wound between the corresponding grooves of the stator teeth 5.
  • the basic structure of such a stator 2 or a winding 3 wound from the described separate clip-like conductors 4 is basically known.
  • the ends 6 of the conductors 4 if the ends 6 are positioned on the outer circumference of the annular winding 3 in the example shown, project axially, i.e. they protrude axially from the winding 3. These ends 6 are associated with individual conductors 3, which in turn are associated with different phases, which is why the conductor ends are to be interconnected according to the routing scheme of the Lei ter 4.
  • a connection ring 7 is used for this, which is placed axially on the end face of the winding 3 and is positioned with respect to the conductor ends 6.
  • the interconnection ring 7 comprises a plurality of the corresponding line bridges and connection sections 8 (see FIG.
  • connection is made by simple welding, so that all conductors 4 are correctly and phase-specifically connected to one another when they are connected.
  • a power supply 10 which is also called HV terminal, and which is arranged radially next to the winding 2, here quasi also outside the stator housing 11, is provided.
  • This power supply 10 comprises a housing 12, in which corresponding busbars are arranged, which with their connection terminals 13, 14, 15, which are each assigned as pairs of corresponding phases, protrude from the housing.
  • connection terminal 13, 14, 15 is to be connected to one phase of the winding 3.
  • Corresponding connection conductors 16 are provided for this purpose, two conductor ends 6 being connected to one connection terminal 13, 14 or 15 each via two separate connection conductors 16 in the example shown.
  • the connecting lines which can also be called busbars or busbars, are also connected to the connection terminals 13, 14, 15 via corresponding welded connections, just as they are contacted with the conductor ends 6 via corresponding welded connections. Since both the conductor ends 6 and the connection terminals 13, 14, 15 protrude axially, the corresponding connection sections 17, 18 of the connecting conductors 16 also run axially.
  • FIGS. 1 and 2 show respective, connected partial views, that is to say that the partial view according to FIG. 2 continues the partial view according to FIG.
  • the connecting conductors 16 are of different lengths, depending on where the corresponding two conductor ends 6 with which they are to be connected are positioned circumferentially.
  • the housing 9 of the interconnection ring 7 in the example shown there are two retaining elements 19 that are used to accommodate one, two or more pairs of connecting conductors 16. This means that the connection conductors 16 are fixed one or more times circumferentially, so that they do not hang freely over a length that is too long, which can lead to the disadvantages described above.
  • connecting conductor pairs 16a, 16b and 16c are provided, the connecting conductor pair 16a being the shortest, the connecting conductor pair 16b the somewhat longer and the connecting conductor pair 16c is the longest conductor pair.
  • the two connecting conductor pairs 16b and 16c are added to the holding element 19, while only the connecting conductor pair 16c is added to the holding element 19 shown in FIG.
  • each holding element 19 in the example shown is designed as a latching element 20 with a combined latching and clamping function.
  • FIG. 3 shows, in an enlarged illustration, the holding element 19 shown in FIG. 1 with the connecting conductor pairs 16b, 16c fixed therein. Since the housing is made of plastic, it is integrally formed on this plastic housing, so it is an integral part of the housing 9. It is, see FIG. 4, designed as an axially upwardly open U-shaped receptacle 21 and has an inner first leg 22 and a outer, flexible leg 23, which is slit over two slots 24, so that three resilient leg sections 25 are formed. For assembly, the respective connection conductor is inserted axially from above.
  • the latching element 20 shown in FIG. 2 is also designed in a corresponding, but somewhat shorter, form. Since only the pair of connecting conductors 16c is to be received there, the leg sections 25 are somewhat shorter, but they also have corresponding elastic clamping properties, via which the connecting conductors are pressed against the opposite leg. There they are also held in position by means of the corresponding locking projections 26.
  • the housing 9 is therefore multifunctional. It serves on the one hand to accommodate the line bridges, not shown in detail, but on the other hand also as a carrier for the holding elements 19 and thus as a fastening location for the connecting conductors 16.
  • An alternative embodiment with regard to the design of the holding elements 19 is shown in FIG.
  • the holding elements 19 are also designed as latching or clamping elements 28, but these latching or clamping elements 28 have U-shaped receptacles 29 open radially outward.
  • latching or clamping element 28 shown on the left in FIG. 5 two such receptacles 29 are formed for one pair of connecting conductors 16b, 16c each, while on the latching or clamping element 28 shown on the right only one receptacle 29 is provided for the connecting conductor pair 16c.
  • the individual connecting conductors are here introduced radially from the side into the respective U-shaped receptacle 29 and clamped therein or, if necessary, also locked in place, for which purpose corresponding locking projections would be provided.
  • the corresponding legs delimiting the receptacle are again designed to be flexible accordingly so that a corresponding clamping fixation takes place, in particular special to the lowermost, stronger leg.
  • the holding elements 19 are integrally formed on the plastic housing 9 of the connection ring 7, that is to say in one piece.

Landscapes

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

Abstract

L'invention concerne une machine électrique comprenant un stator (2) avec un enroulement (3) ayant une pluralité de conducteurs (4) associés à une ou plusieurs phases et interconnectés entre eux, les extrémités (6) d'au moins une partie des conducteurs (4) font saillie à partir de l'enroulement (3), une partie desdites extrémités (6) étant connectée à une bague d'interconnexion (7) placée axialement sur l'enroulement (3) et une autre partie desdites extrémités (6) étant connectée à une connexion de courant (10) disposée radialement à l'extérieur de l'enroulement (3) par l'intermédiaire de conducteurs de connexion (16), les conducteurs de connexion (16) étant fixés à au moins un élément de maintien (19) disposé sur la bague d'interconnexion (7).
EP20746548.5A 2019-08-06 2020-07-07 Machine électrique Pending EP4010963A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019121184.0A DE102019121184A1 (de) 2019-08-06 2019-08-06 Elektrische Maschine
PCT/DE2020/100593 WO2021023334A1 (fr) 2019-08-06 2020-07-07 Machine électrique

Publications (1)

Publication Number Publication Date
EP4010963A1 true EP4010963A1 (fr) 2022-06-15

Family

ID=71833093

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20746548.5A Pending EP4010963A1 (fr) 2019-08-06 2020-07-07 Machine électrique

Country Status (5)

Country Link
US (1) US12095328B2 (fr)
EP (1) EP4010963A1 (fr)
CN (1) CN114175466B (fr)
DE (1) DE102019121184A1 (fr)
WO (1) WO2021023334A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019103191A1 (de) * 2019-02-08 2020-08-13 Schaeffler Technologies AG & Co. KG Stator für eine elektrische Maschine
DE102019121186A1 (de) * 2019-08-06 2021-02-11 Schaeffler Technologies AG & Co. KG Elektrische Maschine
FR3121801B1 (fr) * 2021-04-07 2023-05-05 Nidec Psa Emotors Connecteur pour stator de machine électrique tournante
JP7568587B2 (ja) * 2021-06-17 2024-10-16 株式会社ミツバ 電動機およびその製造方法
EP4300784A1 (fr) * 2022-06-28 2024-01-03 Valeo eAutomotive Germany GmbH Dispositif stator pour une machine électrique et entraînement électrique pour un véhicule
EP4391321A1 (fr) * 2022-12-21 2024-06-26 Valeo eAutomotive Germany GmbH Dispositif terminal pour stator, stator pour machine électrique, méthode de fabrication dudit stator

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DE202009005531U1 (de) 2009-04-11 2010-08-19 Vorwerk & Co. Interholding Gmbh Reluktanzmotor
JP2011182512A (ja) * 2010-02-26 2011-09-15 Nsk Ltd バスバーユニット及びこれを備えた回転電機
CN103828197B (zh) 2011-09-27 2016-08-31 丰田自动车株式会社 旋转电机的母线模块
AU2013403563B2 (en) 2013-10-22 2017-04-20 Mitsubishi Electric Corporation Molded stator, molded electric motor, and air conditioner
JP5677602B1 (ja) 2014-03-28 2015-02-25 三菱電機株式会社 回転電機
JP5872007B1 (ja) 2014-09-19 2016-03-01 日本航空電子工業株式会社 レゾルバステータ
DE102015200093A1 (de) 2015-01-07 2016-07-07 Robert Bosch Gmbh Verschaltungsplatte eines Stators für eine elektrische Maschine und Verfahren zum Herstellen einer solchen
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WO2016124636A1 (fr) 2015-02-03 2016-08-11 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Moteur électrique et ensemble de connexion pour celui-ci
DE102016200115A1 (de) * 2016-01-08 2017-07-13 Zf Friedrichshafen Ag Stator einer elektrischen Maschine mit einer Verschaltungseinrichtung für Statorspulen und elektrische Maschine mit einem derartigen Stator
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DE102019111825A1 (de) 2019-05-07 2020-11-12 Schaeffler Technologies AG & Co. KG Stator für eine elektrische Maschine

Also Published As

Publication number Publication date
WO2021023334A1 (fr) 2021-02-11
CN114175466A (zh) 2022-03-11
CN114175466B (zh) 2024-10-08
US20220263370A1 (en) 2022-08-18
US12095328B2 (en) 2024-09-17
DE102019121184A1 (de) 2021-02-11

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