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EP3844861A1 - Method for producing a stator assembly, and stator assembly - Google Patents

Method for producing a stator assembly, and stator assembly

Info

Publication number
EP3844861A1
EP3844861A1 EP19758707.4A EP19758707A EP3844861A1 EP 3844861 A1 EP3844861 A1 EP 3844861A1 EP 19758707 A EP19758707 A EP 19758707A EP 3844861 A1 EP3844861 A1 EP 3844861A1
Authority
EP
European Patent Office
Prior art keywords
stator assembly
laminated core
ground contact
contact pin
pin
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Withdrawn
Application number
EP19758707.4A
Other languages
German (de)
French (fr)
Inventor
Jens Artmann
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.)
Vitesco Technologies GmbH
Original Assignee
Vitesco Technologies GmbH
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 Vitesco Technologies GmbH filed Critical Vitesco Technologies GmbH
Publication of EP3844861A1 publication Critical patent/EP3844861A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40—Structural association with grounding devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines
    • 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
    • H02K15/30—Manufacture of winding connections
    • H02K15/32—Manufacture of terminal arrangements; Connecting the terminals to external circuits
    • 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
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/021—Magnetic cores
    • H02K15/022—Magnetic cores with salient poles
    • 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
    • H02K2203/03—Machines characterised by the wiring boards, i.e. printed circuit boards or similar structures 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
    • H02K2203/12—Machines characterised by the bobbins for supporting the windings

Definitions

  • the present invention relates to a method for producing a stator assembly of an electric motor.
  • the stator lamination of electric motors should be electrically connected to ground in order to be able to comply with the prescribed EMC limit values (electromagnetic compatibility).
  • EMC limit values electromagnettic compatibility
  • stator assemblies usually have a completely molded stator lamination, the electrical contacting is made more difficult.
  • This problem has been solved, for example, as follows: via shielding through a metallic housing, via a ground connection via the press connection of the stator lamination and actuator housing, or via subsequent contacting via the stator bore, electrically conductive grease and a silver-plated contact spring.
  • no ground connection was seen at all, which resulted in poor electromagnetic compatibility.
  • the present invention has for its object to provide a method for manufacturing a stator assembly, which enables the implementation of a ground connection in a particularly effective manner.
  • the ground contact pin is preferably mounted on the coil former in contact with the laminated core.
  • the ground contact pin is preferably mounted in a receptacle on the coil former. The ground connection is therefore made with the help of the assembled coil former.
  • the ground contact pin is mounted as a press fit pin.
  • a press-fit connection is produced with the receptacle provided on the coil former, the required contact with the laminated core of the stator assembly being realized by this press-fit connection.
  • the method according to the invention takes place in such a way that a coil former provided with a receptacle for the pressfit pin is mounted on the laminated core, after which the pressfit pin is inserted into the receptacle for producing a pressfit connection and is pressed with it .
  • contact of the press-fit pin with the laminated core is achieved in order to prepare the appropriate ground connection.
  • the laminated core can then be overmolded accordingly.
  • a lead frame pin is preferably used as the ground contact pin or press-fit pin.
  • the ground contact pin is preferably connected to the printed circuit board of the stator assembly.
  • the ground contact pin can also be arranged in such a way that the at least one assembled coil former is additionally fixed to the ground contact pin.
  • a plurality of mas contact pins can also be mounted, each having a mass contact pin being assigned to a coil former.
  • a stator assembly three bobbins are mounted on a laminated core, and three ground contact pins are attached to the bobbins in contact with the laminated core, one ground contact pin being assigned to one bobbin.
  • the present invention further relates to a stator assembly which has been produced by a method of the type described above.
  • a laminated core 1 which has three recesses for the respective accommodation of a coil former 2.
  • the upper two figures of the figure show how a coil former 2 is mounted on the laminated core 1 by being pushed onto a tongue in a recess.
  • the third illustration from above shows how the coil body has reached its radial end position in the corresponding recess. It has a pocket-shaped receptacle 3 at its radial end, into which a press-fit pin 4 is inserted from above and connected to the receptacle 3 of the coil body 2 with a press-fit connection. The lower end of the press-fit pin 4 comes into contact with the laminated core 1 in order to achieve a ground connection there.
  • the fourth illustration from above shows the pressfit pin 4 in its end position.
  • stator assembly produced in this way which is provided with corresponding ground contact pins 4, is then encapsulated with plastic in a suitable manner, so that the object shown in the figure below results.
  • three coil bodies 2 are each provided with a press-fit pin as ground contact pin 4, which is connected to the respective coil body via a press-fit connection and ensures a ground connection to the laminated core 1.
  • ground contact pins 4 provided in this way are then brought into contact with a printed circuit board (not shown here). This also fixes the circuit board in addition to the desired ground connection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

The invention relates to a method for producing a stator assembly of an electric motor, in which method the ground connection of the laminated core of the stator assembly is realized. In said method, at least one coil body is mounted on the laminated core. Then a ground contact pin is attached to the laminated core provided with the coil body and the laminated core is overmolded with plastic. The ground contact pin is preferably mounted as a press-fit pin. The ground connection can thus be realized particularly effectively.

Description

Beschreibung description

Verfahren zur Herstellung einer Statorbaugruppe und Method of manufacturing a stator assembly and

Statorbaugruppe Stator assembly

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von einer Statorbaugruppe eines Elektromotors. The present invention relates to a method for producing a stator assembly of an electric motor.

Die Statorblechung von Elektromotoren sollte elektrisch auf Masse kontaktiert sein, um die vorgeschriebenen EMV-Grenzwerte (elektromagnetische Verträglichkeit ) einhalten zu können. Durch die Masseanbindung wird die elektromagnetische Verträglichkeit verbessert . The stator lamination of electric motors should be electrically connected to ground in order to be able to comply with the prescribed EMC limit values (electromagnetic compatibility). The ground connection improves the electromagnetic compatibility.

Da jedoch derartige Statorbaugruppen eine meist komplett um spritzte Statorblechung aufweisen, wird die elektrische Kon taktierung erschwert. Dieses Problem hat man beispielsweise bisher wie folgt gelöst: Über eine Abschirmung durch ein me tallisches Gehäuse, über eine Masseanbindung über den Press verband von Statorblechung und Aktuatorgehäuse oder über eine nachträglich angebrachte Kontaktierung über die Statorbohrung, elektrisch leitendes Fett und eine versilberte Kontaktfeder . Darüber hinaus hat man überhaupt keine Masseanbindung vorge sehen, was eine schlechte elektromagnetische Verträglichkeit zur Folge hatte. However, since such stator assemblies usually have a completely molded stator lamination, the electrical contacting is made more difficult. This problem has been solved, for example, as follows: via shielding through a metallic housing, via a ground connection via the press connection of the stator lamination and actuator housing, or via subsequent contacting via the stator bore, electrically conductive grease and a silver-plated contact spring. In addition, no ground connection was seen at all, which resulted in poor electromagnetic compatibility.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung einer Statorbaugruppe zur Verfügung zu stellen, das die Durchführung einer Masseanbindung auf besonders effektive Art und Weise ermöglicht. The present invention has for its object to provide a method for manufacturing a stator assembly, which enables the implementation of a ground connection in a particularly effective manner.

Diese Aufgabe wird erfindungsgemäß durch ein Verfahren zur Herstellung einer Statorbaugruppe eines Elektromotors gelöst, das die folgenden Schritte umfasst: This object is achieved according to the invention by a method for producing a stator assembly of an electric motor, which comprises the following steps:

Bereitstellen eines Blechpaketes der Statorbaugruppe; Montieren von mindestens einem Spulenkörper auf dem Blechpaket; Providing a laminated core of the stator assembly; Mounting at least one coil former on the laminated core;

Montieren eines Massekontaktstiftes am mit dem Spulenkörper versehenen Blechpaket; und Mounting a ground contact pin on the laminated core provided with the coil former; and

Umspritzen des Blechpaketes mit Kunststoff. Injection molding of the laminated core with plastic.

Bei dem erfindungsgemäßen Verfahren ist eine nachträgliche Bearbeitung der umspritzten Statorbaugruppe zur Durchführung der Masseanbindung nicht erforderlich. Vielmehr wird ein Masse kontaktstift am mit dem Spulenkörper versehenen Blechpaket montiert, wonach das mit dem Massekontaktstift versehene Blechpaket umspritzt wird. Auf diese Weise kann eine Masse anbindung ohne zusätzliche bzw. nachträgliche Bearbeitung der Statorblechung durchgeführt werden. In the method according to the invention, subsequent processing of the extrusion-coated stator assembly to carry out the ground connection is not necessary. Rather, a ground contact pin is mounted on the laminated core provided with the coil former, after which the laminated core provided with the ground contact pin is extrusion-coated. In this way, a mass connection can be carried out without additional or subsequent processing of the stator lamination.

Der Massekontaktstift wird vorzugsweise am Spulenkörper in Kontakt mit dem Blechpaket montiert. Dabei erfolgt die Montage des Massekontaktstiftes vorzugsweise in einer Aufnahme am Spulenkörper. Die Masseanbindung wird daher mit Hilfe des montierten Spulenkörpers hergestellt. The ground contact pin is preferably mounted on the coil former in contact with the laminated core. The ground contact pin is preferably mounted in a receptacle on the coil former. The ground connection is therefore made with the help of the assembled coil former.

Bei einer besonders bevorzugten Lösung des erfindungsgemäßen Verfahrens wird der Massekontaktstift als Pressfit-Stift montiert. Speziell wird dabei eine Pressfit-Verbindung mit der am Spulenkörper vorgesehenen Aufnahme hergestellt, wobei durch diese Pressfit-Verbindung der erforderliche Kontakt mit dem Blechpaket der Statorbaugruppe realisiert wird. Insgesamt läuft daher bei dieser Ausführungsform das erfindungsgemäße Verfahren so ab, dass ein mit einer Aufnahme für den Pressfit-Stift versehener Spulenkörper auf dem Blechpaket montiert wird, wonach der Pressfit-Stift zur Herstellung einer Pressfit-Verbindung in die Aufnahme eingeführt und mit dieser verpresst wird. Wie erwähnt, wird dadurch ein Kontakt des Pressfit-Stiftes mit dem Blechpaket erzielt, um die entsprechende Masseanbindung vor zubereiten. Danach kann das Blechpaket entsprechend umspritzt werden . Als Massekontaktstift bzw. Pressfit-Stift wird vorzugsweise ein Stanzgitterpin verwendet. In a particularly preferred solution of the method according to the invention, the ground contact pin is mounted as a press fit pin. Specifically, a press-fit connection is produced with the receptacle provided on the coil former, the required contact with the laminated core of the stator assembly being realized by this press-fit connection. Overall, therefore, in this embodiment, the method according to the invention takes place in such a way that a coil former provided with a receptacle for the pressfit pin is mounted on the laminated core, after which the pressfit pin is inserted into the receptacle for producing a pressfit connection and is pressed with it . As mentioned, contact of the press-fit pin with the laminated core is achieved in order to prepare the appropriate ground connection. The laminated core can then be overmolded accordingly. A lead frame pin is preferably used as the ground contact pin or press-fit pin.

Um die Masseanbindung herzustellen, wird der Massekontaktstift vorzugsweise mit der Leiterplatte der Statorbaugruppe verbunden. In order to establish the ground connection, the ground contact pin is preferably connected to the printed circuit board of the stator assembly.

Auch kann der Massekontaktstift so angeordnet werden, dass der mindestens eine montierte Spulenkörper am Massekontaktstift zusätzlich fixiert wird. The ground contact pin can also be arranged in such a way that the at least one assembled coil former is additionally fixed to the ground contact pin.

Mit dem erfindungsgemäßen Verfahren können auch mehrere Mas sekontaktstifte montiert werden, wobei jeweils ein Massekon taktstift einem Spulenkörper zugeordnet ist. Beispielsweise werden bei einer Statorbaugruppe drei Spulenkörper auf einem Blechpaket montiert, und es werden drei Massekontaktstifte an den Spulenkörpern in Kontakt mit dem Blechpaket angebracht, wobei jeweils ein Massekontaktstift einem Spulenkörper zugeordnet wird . With the method according to the invention, a plurality of mas contact pins can also be mounted, each having a mass contact pin being assigned to a coil former. For example, in a stator assembly, three bobbins are mounted on a laminated core, and three ground contact pins are attached to the bobbins in contact with the laminated core, one ground contact pin being assigned to one bobbin.

Mit dem erfindungsgemäßen Verfahren wird eine Reihe von Vorteilen erzielt. Wie bereits erwähnt, ist eine nachträgliche Bearbeitung des umspritzten Stators nicht mehr erforderlich. Durch die Masseanbindung mit der Leiterplatte kann ein zusätzliches Kontaktplättchen auf der Leiterplatte entfallen. Wie ebenfalls bereits erwähnt, kann mit der Anbringung des MassekontaktStiftes eine zusätzliche Fixierung der Leiterplatte erreicht werden. Auch kann der Massekontaktstift als zusätzliche Fixierung des oder der montierten Spulenkörper dienen. A number of advantages are achieved with the method according to the invention. As already mentioned, subsequent processing of the extrusion-coated stator is no longer necessary. Due to the ground connection to the circuit board, an additional contact plate on the circuit board can be omitted. As already mentioned, an additional fixation of the circuit board can be achieved by attaching the ground contact pin. The ground contact pin can also serve as an additional fixation of the assembled coil former (s).

Die vorliegende Erfindung betrifft ferner eine Statorbaugruppe, die nach einem Verfahren der vorstehend beschriebenen Art hergestellt worden ist. The present invention further relates to a stator assembly which has been produced by a method of the type described above.

Die Erfindung wird nachfolgend anhand eines Ausführungsbei spieles in Verbindung mit der Zeichnung im Einzelnen erläutert. Die einzige Figur zeigt mehrere Schritte des erfindungsgemäßen Verfahrens . The invention is explained below with reference to a game Ausführungsbei in connection with the drawing in detail. The single figure shows several steps of the method according to the invention.

Bei dem erfindungsgemäßen Verfahren zur Herstellung einer Statorbaugruppe eines Elektromotors wird ein Blechpaket 1 bereitgestellt, das drei Ausnehmungen zur jeweiligen Aufnahme eines Spulenkörpers 2 besitzt. Die oberen beiden Abbildungen der Figur zeigen, wie ein Spulenkörper 2 auf dem Blechpaket 1 montiert wird, indem er auf eine Zunge in einer Ausnehmung geschoben wird. In the method according to the invention for producing a stator assembly of an electric motor, a laminated core 1 is provided which has three recesses for the respective accommodation of a coil former 2. The upper two figures of the figure show how a coil former 2 is mounted on the laminated core 1 by being pushed onto a tongue in a recess.

Mit der dritten Abbildung von oben ist gezeigt, wie der Spu lenkörper seine radiale Endstellung in der entsprechenden Ausnehmung erreicht hat. Er weist an seinem radialen Ende eine taschenförmige Aufnahme 3 auf, in die von oben ein Pressfit-Stift 4 eingesetzt und mit einer Pressfit-Verbindung mit der Aufnahme 3 des Spulenkörpers 2 verbunden wird. Dabei tritt der Press- fit-Stift 4 mit seinem unteren Ende mit dem Blechpaket 1 in Kontakt, um dort eine Masseanbindung zu erreichen. Die vierte Abbildung von oben zeigt den Pressfit-Stift 4 in seiner End stellung . The third illustration from above shows how the coil body has reached its radial end position in the corresponding recess. It has a pocket-shaped receptacle 3 at its radial end, into which a press-fit pin 4 is inserted from above and connected to the receptacle 3 of the coil body 2 with a press-fit connection. The lower end of the press-fit pin 4 comes into contact with the laminated core 1 in order to achieve a ground connection there. The fourth illustration from above shows the pressfit pin 4 in its end position.

Danach können weitere Spulenkörper in die entsprechenden Ausnehmungen eingesetzt und mit Pressfit-Stiften versehen werden, was hier jedoch nicht gezeigt ist. Afterwards, further bobbins can be inserted into the corresponding recesses and provided with pressfit pins, which is not shown here.

Die auf diese Weise hergestellte Statorbaugruppe, die mit entsprechenden Massekontaktstiften 4 versehen ist, wird dann mit Kunststoff in geeigneter Weise umspritzt, so dass sich der in der unteren Abbildung dargestellte Gegenstand ergibt. Man erkennt, dass hierbei drei Spulenkörper 2 jeweils mit einem Pressfit-Stift als Massekontaktstift 4 versehen sind, der über eine Press- fit-Verbindung mit dem jeweiligen Spulenkörper in Verbindung steht und für eine Masseanbindung an das Blechpaket 1 sorgt. The stator assembly produced in this way, which is provided with corresponding ground contact pins 4, is then encapsulated with plastic in a suitable manner, so that the object shown in the figure below results. It can be seen that here three coil bodies 2 are each provided with a press-fit pin as ground contact pin 4, which is connected to the respective coil body via a press-fit connection and ensures a ground connection to the laminated core 1.

Die auf diese Weise vorgesehenen Massekontaktstifte 4 werden dann mit einer Leiterplatte (hier nicht gezeigt) in Kontakt gebracht. Hierdurch wird die Leiterplatte neben der gewünschten Masse anbindung zusätzlich fixiert. The ground contact pins 4 provided in this way are then brought into contact with a printed circuit board (not shown here). This also fixes the circuit board in addition to the desired ground connection.

Claims

Patentansprüche claims 1. Verfahren zur Herstellung einer Statorbaugruppe eines Elektromotors mit den folgenden Schritten: 1. Method for producing a stator assembly of an electric motor with the following steps: Bereitstellen eines Blechpaketes (1) der Statorbaugruppe; Providing a laminated core (1) of the stator assembly; Montieren von mindestens einem Spulenkörper (2) auf dem Blechpaket (1); Mounting at least one coil former (2) on the laminated core (1); Montieren eines Massekontaktstiftes (4) am mit dem Spu lenkörper (2) versehenen Blechpaket (1); und Assemble a ground contact pin (4) on the laminated core (1) provided with the coil body (2); and Umspritzen des Blechpaketes mit Kunststoff Injection molding of the laminated core with plastic 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Massekontaktstift (4) am Spulenkörper (2) in Kontakt mit dem Blechpaket (1) montiert wird. 2. The method according to claim 1, characterized in that the ground contact pin (4) is mounted on the coil former (2) in contact with the laminated core (1). 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Massekontaktstift (4) in einer Aufnahme (3) am Spulenkörper (2) montiert wird. 3. The method according to claim 1 or 2, characterized in that the ground contact pin (4) is mounted in a receptacle (3) on the coil body (2). 4. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Massekontaktstift (4) als 4. The method according to any one of the preceding claims, characterized in that the ground contact pin (4) as Pressfit-Stift montiert wird.  Pressfit pin is mounted. 5. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass als Massekontaktstift (4) ein 5. The method according to any one of the preceding claims, characterized in that as a ground contact pin (4) Stanzgitterpin verwendet wird.  Lead frame pin is used. 6. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Massekontaktstift (4) mit der Leiterplatte der Statorbaugruppe verbunden wird. 6. The method according to any one of the preceding claims, characterized in that the ground contact pin (4) is connected to the circuit board of the stator assembly. 7. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der mindestens eine montierte Spu- lenkörper (2) durch den Massekontaktstift (4) zusätzlich fixiert wird. 7. The method according to any one of the preceding claims, characterized in that the at least one assembled spool steering body (2) is additionally fixed by the ground contact pin (4). Statorbaugruppe, hergestellt nach einem Verfahren der vorangehenden Ansprüche. Stator assembly, produced by a method of the preceding claims.
EP19758707.4A 2018-08-27 2019-08-22 Method for producing a stator assembly, and stator assembly Withdrawn EP3844861A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018214441.9A DE102018214441A1 (en) 2018-08-27 2018-08-27 Method of manufacturing a stator assembly and stator assembly
PCT/EP2019/072448 WO2020043589A1 (en) 2018-08-27 2019-08-22 Method for producing a stator assembly, and stator assembly

Publications (1)

Publication Number Publication Date
EP3844861A1 true EP3844861A1 (en) 2021-07-07

Family

ID=67742423

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19758707.4A Withdrawn EP3844861A1 (en) 2018-08-27 2019-08-22 Method for producing a stator assembly, and stator assembly

Country Status (6)

Country Link
US (1) US12224631B2 (en)
EP (1) EP3844861A1 (en)
KR (1) KR102608044B1 (en)
CN (1) CN112313860A (en)
DE (1) DE102018214441A1 (en)
WO (1) WO2020043589A1 (en)

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US12224631B2 (en) 2025-02-11
WO2020043589A1 (en) 2020-03-05
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CN112313860A (en) 2021-02-02
DE102018214441A1 (en) 2020-02-27
US20210344261A1 (en) 2021-11-04
KR102608044B1 (en) 2023-11-29

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