WO2024041864A1 - Electric motor - Google Patents

Electric motor Download PDF

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Publication number
WO2024041864A1
WO2024041864A1 PCT/EP2023/071479 EP2023071479W WO2024041864A1 WO 2024041864 A1 WO2024041864 A1 WO 2024041864A1 EP 2023071479 W EP2023071479 W EP 2023071479W WO 2024041864 A1 WO2024041864 A1 WO 2024041864A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
electric motor
insulating element
motor according
stator windings
Prior art date
Application number
PCT/EP2023/071479
Other languages
German (de)
French (fr)
Inventor
Sebastian Hoffmann
Stephan Gaertner
Steffen Buhl
Jochen Wessner
Markus PECHINGER
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2024041864A1 publication Critical patent/WO2024041864A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/30—Windings characterised by the insulating material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/024—Units comprising pumps and their driving means the driving means being assisted by a power recovery turbine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • 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
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/25—Devices for sensing temperature, or actuated thereby
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/38—Windings characterised by the shape, form or construction of the insulation around winding heads, equalising connectors, or connections thereto
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Definitions

  • the invention relates to an electric motor according to the preamble of claim 1.
  • Such an electric motor for driving a gas delivery device in the form of an air compressor for a fuel cell system is provided by the
  • This air compressor has a compressor wheel connected to a rotor, the rotor being driven by an electric motor.
  • the electric motor has a stator surrounding the rotor, the stator having a stator section with stator windings.
  • Electrical insulation is provided between the stator windings and the rotor, which is designed, for example, as a casting compound.
  • the casting compound is applied in a liquid or plastic state and then hardens. After hardening, the casting compound can become brittle and cracks can form in it, especially after prolonged operation of the electric motor as a result of the temperature changes that occur, so that the electrical insulation may no longer be adequately guaranteed.
  • the electric motor according to the invention has the advantage that the at least one insulating element ensures sufficient electrical insulation over a long period of operation, since no cracking occurs due to its elastic deformability.
  • Advantageous refinements and developments of the invention are specified in the dependent claims.
  • the design according to claim 2 or 3 further improves the insulating effect of the insulating element.
  • the design according to claim 4 or 5 enables the insulating element to be in sufficient contact with the stator windings.
  • the training according to claim 7 improves the adhesion of the casting material to the insulating element.
  • the design according to claim 8 or 9 makes it possible to position at least one sensor in a simple manner without the need for further components.
  • Figure 1 is a schematic representation of a fuel cell system with a gas delivery device designed as an air compressor;
  • Figure 2 is an enlarged view of a section of the air compressor in the area of an electric motor from Figure 1 in a longitudinal section with at least one insulating element;
  • Figure 3 shows the insulating element before its arrangement in the electric motor
  • Figure 4 shows the insulating element in a longitudinal section with a sensor arranged in a receptacle formed in this.
  • a fuel cell system for example for a motor vehicle, is shown in a simplified schematic manner in FIG.
  • the fuel cell system has at least one fuel cell stack 10, to which fuel, for example hydrogen, is supplied via an anode system 12 and oxidizing agent, in particular air, via a cathode system 14.
  • the Cathode system 14 has a gas delivery device 16 in the form of an air compressor, through which air is supplied to the fuel cell stack in the amount required for the respective operating state at the required pressure.
  • the air compressor 16 has a multi-part housing 18, in which an electric motor 20 is arranged as a drive, through which a shaft 22 is driven to rotate about its longitudinal axis 23, to which at least one compressor wheel 24 is connected.
  • the shaft 22 is connected to a rotor 26 of the electric motor 20 or the rotor 26 is part of the shaft 22.
  • the electric motor 20 also has a stator 28 which surrounds the rotor 26.
  • the stator 28 is arranged in the housing 18 and can be surrounded by a cooling sleeve 30.
  • the stator 28 has a stator base body 32, which can be constructed from a plurality of stator laminations assembled into a package.
  • Stator windings 36 are arranged at least on a central stator section 34 of the stator base body 32 as seen in the direction of the longitudinal axis 23 of the shaft 22.
  • the stator windings 36 run between two opposite front ends of the stator along the longitudinal axis 23. At the front ends, the stator windings 36 protrude beyond the stator base body 32 in the longitudinal direction and thereby form so-called winding heads 38.
  • stator windings 36 run transversely to the longitudinal axis 23 of the stator 28 approximately in its circumferential direction.
  • stator 28 has a larger inner diameter than in the middle stator section 34.
  • stator 28 has transition sections 35 which are at least approximately conical.
  • the middle stator section 34 forms a first stator section with a first, small inner diameter and the winding heads 38 form second stator sections with a larger inner diameter.
  • the rotor 26 is arranged within the stator 28 at a small radial distance from the stator windings 36 and electrical insulation is provided between the stator windings 36 and the rotor 26.
  • the electrical insulation has at least one insulating element 40, which will be explained in more detail below, and a potting material 50.
  • the insulating element 40 is shown according to a first exemplary embodiment.
  • the insulating element 40 consists of an electrically insulating material, in particular plastic, which has a higher elasticity than the casting material 50.
  • the at least one insulating element 40 is designed such that it covers the stator windings 36 at least in some areas.
  • the insulating element 40 is preferably designed as an at least approximately closed ring running around the axis of rotation 23 of the rotor 26. Seen in the direction of the axis of rotation 23, the insulating element 40 extends at least over part of the stator windings 36.
  • the at least one insulating element 40 rests in the radial direction with respect to the axis of rotation 23 on the stator windings 36 and fixes them on the stator base body 32 before the potting material 50 is introduced becomes.
  • the insulating element 40 is designed according to the inner contour of the stator 28 and has a first section 42 with a small outside diameter, which is arranged in the middle stator section 34, a second section 44 with a larger outside diameter, which is arranged in the area of the winding head 38 and at least approximately conical transition section 46, which is arranged in the area of the transition section 35 of the stator 28.
  • an insulating element 40 is arranged only on one side of the stator 28.
  • an insulating element 40 can be arranged on both sides of the stator 28, with the insulating elements 40 on the two sides preferably having the same design.
  • the insulating element 40 is inserted into the stator 28 from the end winding 38 side.
  • the potting material 50 is then introduced, which fills existing cavities between the insulating element 40 and the stator windings 36 and also covers the inside 41 of the insulating element 40 facing away from the stator windings 36.
  • the inside 41 of the insulating element 40 can have a surface with high roughness, whereby the adhesion of the potting material 50 is improved.
  • the insulating element 40 is shown according to a second exemplary embodiment.
  • the insulating element 40 is designed essentially the same as in the first exemplary embodiment, but additionally has a receptacle 60 for a sensor 62, for example a temperature sensor.
  • the receptacle 60 is, for example, as a slot-shaped recess or recess
  • Circumference of the insulating element 40 is formed, which extends from the end of the insulating element 40 pointing out of the stator 28 in its second section 44.
  • the sensor 62 can be inserted into the receptacle 60 after the insulating element 40 is inserted into the stator 28.
  • the sensor 62 is preferably used to detect the temperature of the stator windings 36, in particular in the area of the winding head 38. In order to ensure good contact of the sensor 62 with the stator windings 36, it can be provided that at least one on the insulating element 40 acts on the sensor 62 and closes it the stator windings 36 pressing resilient arm is arranged.

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

Abstract

The invention relates to an electric motor, in particular for a gas conveying device, comprising a stator (28) and a rotor (26), which is surrounded by the stator (28), wherein the stator (28) has stator portions (34, 35, 38) with stator windings (36). Electrical insulation (40; 50) is provided between the stator windings (36) and the rotor (26), which electrical insulation comprises at least one casting material (50). The electrical insulation also comprises at least one insulating element (40), which covers the stator windings (36) at least in regions and consists of a material having a higher elasticity than the casting material (50).

Description

Beschreibung Description
Titel title
Elektromotor Electric motor
Die Erfindung betrifft einen Elektromotor gemäß dem Oberbegriff des Anspruchs 1. The invention relates to an electric motor according to the preamble of claim 1.
Stand der Technik State of the art
Ein solcher Elektromotor zum Antrieb einer Gasfördervorrichtung in Form eines Luftverdichters für ein Brennstoffzellensystem ist durch die Such an electric motor for driving a gas delivery device in the form of an air compressor for a fuel cell system is provided by the
DE 10 2018 201 162 Al bekannt. Dieser Luftverdichter weist ein mit einem Rotor verbündendes Verdichterrad auf, wobei der Rotor durch einen Elektromotor angetrieben wird. Der Elektromotor weist einen den Rotor umgebenden Stator auf, wobei der Stator einen Statorabschnitt mit Statorwicklungen aufweist. Zwischen den Statorwicklungen und dem Rotor ist eine elektrische Isolierung vorgesehen, die beispielsweise als Vergussmasse ausgeführt ist. Die Vergussmasse wird in flüssigem oder plastischem Zustand aufgebracht und härtet anschließend aus. Nach dem Aushärten kann die Vergussmasse verspröden und es können sich Risse in dieser bilden, insbesondere nach längerem Betrieb des Elektromotors infolge der auftretenden Temperaturwechsel, so dass die elektrische Isolierung unter Umständen nicht mehr ausreichend gewährleistet ist. DE 10 2018 201 162 Al known. This air compressor has a compressor wheel connected to a rotor, the rotor being driven by an electric motor. The electric motor has a stator surrounding the rotor, the stator having a stator section with stator windings. Electrical insulation is provided between the stator windings and the rotor, which is designed, for example, as a casting compound. The casting compound is applied in a liquid or plastic state and then hardens. After hardening, the casting compound can become brittle and cracks can form in it, especially after prolonged operation of the electric motor as a result of the temperature changes that occur, so that the electrical insulation may no longer be adequately guaranteed.
Offenbarung der Erfindung Disclosure of the invention
Der erfindungsgemäße Elektromotor hat demgegenüber den Vorteil, dass durch das wenigstens eine Isolierelement eine ausreichende elektrische Isolierung über eine lange Betriebsdauer sichergestellt ist, da bei diesem infolge seiner elastischen Verformbarkeit keine Rissbildung auftritt. In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung angegeben. Durch die Ausbildung gemäß Anspruch 2 oder 3 ist die Isolierwirkung des Isolierelements weiter verbessert. Durch die Ausbildung gemäß Anspruch 4 oder 5 ist eine ausreichende Anlage des Isolierelements an den Statorwicklungen ermöglicht. Durch die Ausbildung gemäß Anspruch 7 ist die Haftung des Vergussmaterials am Isolierelement verbessert. Durch die Ausbildung gemäß Anspruch 8 oder 9 ist auf einfache Weise eine Positionierung wenigstens eines Sensors ermöglicht, ohne dass hierzu weitere Bauteile erforderlich sind. The electric motor according to the invention has the advantage that the at least one insulating element ensures sufficient electrical insulation over a long period of operation, since no cracking occurs due to its elastic deformability. Advantageous refinements and developments of the invention are specified in the dependent claims. The design according to claim 2 or 3 further improves the insulating effect of the insulating element. The design according to claim 4 or 5 enables the insulating element to be in sufficient contact with the stator windings. The training according to claim 7 improves the adhesion of the casting material to the insulating element. The design according to claim 8 or 9 makes it possible to position at least one sensor in a simple manner without the need for further components.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung verschiedene Ausführungsbeispiele im Einzelnen beschrieben sind. Further advantages, features and details of the invention emerge from the following description, in which various exemplary embodiments are described in detail with reference to the drawing.
Es zeigen: Show it:
Figur 1 eine schematische Darstellung eines Brennstoffzellensystems mit einer als Luftverdichter ausgeführten Gasfördervorrichtung; Figure 1 is a schematic representation of a fuel cell system with a gas delivery device designed as an air compressor;
Figur 2 eine vergrößerte Darstellung eines Ausschnitts des Luftverdichters im Bereich eines Elektromotors von Figur 1 in einem Längsschnitt mit wenigstens einem Isolierelement; Figure 2 is an enlarged view of a section of the air compressor in the area of an electric motor from Figure 1 in a longitudinal section with at least one insulating element;
Figur 3 das Isolierelement vor dessen Anordnung im Elektromotor; und Figure 3 shows the insulating element before its arrangement in the electric motor; and
Figur 4 das Isolierelement in einem Längsschnitt mit einem in einer in diesem ausgebildeten Aufnahme angeordneten Sensor. Figure 4 shows the insulating element in a longitudinal section with a sensor arranged in a receptacle formed in this.
Beschreibung der Ausführungsbeispiele Description of the exemplary embodiments
In Figur 1 ist in vereinfachter schematischer Weise ein Brennstoffzellensystem beispielsweise für ein Kraftfahrzeug dargestellt. Das Brennstoffzellensystem weist wenigstens einen Brennstoffzellenstack 10 auf, dem über ein Anodensystem 12 Brennstoff, beispielsweise Wasserstoff, und über ein Kathodensystem 14 Oxidationsmittel, insbesondere Luft, zugeführt wird. Das Kathodensystem 14 weist eine Gasfördervorrichtung 16 in Form eines Luftverdichters auf, durch den dem Brennstoffzellenstack Luft in der für den jeweiligen Betriebszustand erforderlichen Menge mit dem erforderlichen Druck zugeführt wird. Der Luftverdichter 16 weist wie in Figur 2 dargestellt ein mehrteiliges Gehäuse 18 auf, in dem ein Elektromotor 20 als Antrieb angeordnet ist, durch den eine Welle 22 um ihre Längsachse 23 rotierend angetrieben wird, mit der wenigstens ein Verdichterrad 24 verbunden ist. Die Welle 22 ist mit einem Rotor 26 des Elektromotors 20 verbunden oder der Rotor 26 ist Teil der Welle 22. Der Elektromotor 20 weist außerdem einen Stator 28 auf, der den Rotor 26 umgibt. A fuel cell system, for example for a motor vehicle, is shown in a simplified schematic manner in FIG. The fuel cell system has at least one fuel cell stack 10, to which fuel, for example hydrogen, is supplied via an anode system 12 and oxidizing agent, in particular air, via a cathode system 14. The Cathode system 14 has a gas delivery device 16 in the form of an air compressor, through which air is supplied to the fuel cell stack in the amount required for the respective operating state at the required pressure. 2, the air compressor 16 has a multi-part housing 18, in which an electric motor 20 is arranged as a drive, through which a shaft 22 is driven to rotate about its longitudinal axis 23, to which at least one compressor wheel 24 is connected. The shaft 22 is connected to a rotor 26 of the electric motor 20 or the rotor 26 is part of the shaft 22. The electric motor 20 also has a stator 28 which surrounds the rotor 26.
Der Stator 28 ist im Gehäuse 18 angeordnet und kann von einer Kühlhülse 30 umgeben sein. Der Stator 28 weist einen Statorgrundkörper 32 auf, der aus einer Mehrzahl von zu einem Paket zusammengesetzten Statorblechen aufgebaut sein kann. Zumindest auf einem in Richtung der Längsachse 23 der Welle 22 gesehen mittleren Statorabschnitt 34 des Statorgrundkörpers 32 sind Statorwicklungen 36 angeordnet. Die Statorwicklungen 36 verlaufen zwischen zwei gegenüberliegenden Stirnenden des Stators entlang der Längsachse 23. An den Stirnenden ragen die Statorwicklungen 36 über den Statorgrundkörper 32 in Längsrichtung hinaus und bilden hierbei sogenannte Wickelköpfe 38. Im Bereich dieser Wickelköpfe 38 verlaufen die einzelnen Statorwicklungen 36 quer zur Längsachse 23 des Stators 28 etwa in dessen Umfangsrichtung. Im Bereich der Wickelköpfe 38 weist der Stator 28 jeweils einen größeren Innendurchmesser auf als im mittleren Statorabschnitt 34. Zwischen dem mittleren Statorabschnitt 34 und den Wickelköpfen 38 weist der Stator 28 Übergangsabschnitte 35 auf, die zumindest annähernd konisch ausgebildet sind. Der mittlere Statorabschnitt 34 bildet einen ersten Statorabschnitt mit einem ersten, kleinen Innendurchmesser und die Wickelköpfe 38 bilden zweite Statorabschnitte mit größerem Innendurchmesser. The stator 28 is arranged in the housing 18 and can be surrounded by a cooling sleeve 30. The stator 28 has a stator base body 32, which can be constructed from a plurality of stator laminations assembled into a package. Stator windings 36 are arranged at least on a central stator section 34 of the stator base body 32 as seen in the direction of the longitudinal axis 23 of the shaft 22. The stator windings 36 run between two opposite front ends of the stator along the longitudinal axis 23. At the front ends, the stator windings 36 protrude beyond the stator base body 32 in the longitudinal direction and thereby form so-called winding heads 38. In the area of these winding heads 38, the individual stator windings 36 run transversely to the longitudinal axis 23 of the stator 28 approximately in its circumferential direction. In the area of the winding heads 38, the stator 28 has a larger inner diameter than in the middle stator section 34. Between the middle stator section 34 and the winding heads 38, the stator 28 has transition sections 35 which are at least approximately conical. The middle stator section 34 forms a first stator section with a first, small inner diameter and the winding heads 38 form second stator sections with a larger inner diameter.
Der Rotor 26 ist mit geringem radialem Abstand zu den Statorwicklungen 36 innerhalb des Stators 28 angeordnet und zwischen den Statorwicklungen 36 und dem Rotor 26 ist eine elektrische Isolierung vorgesehen. Die elektrische Isolierung weist wenigstens ein nachfolgend noch näher erläutertes Isolierelement 40 und ein Vergussmaterial 50 auf. In den Figuren 2 und 3 ist dabei das Isolierelement 40 gemäß einem ersten Ausführungsbeispiel dargestellt. The rotor 26 is arranged within the stator 28 at a small radial distance from the stator windings 36 and electrical insulation is provided between the stator windings 36 and the rotor 26. The electrical insulation has at least one insulating element 40, which will be explained in more detail below, and a potting material 50. In Figures 2 and 3 is the insulating element 40 is shown according to a first exemplary embodiment.
Das Isolierelement 40 besteht aus einem elektrisch isolierenden Material, inbesondere Kunststoff, das eine höhere Elastizität besitzt als das Vergussmaterial 50. Das wenigstens eine Isolierelement 40 ist so ausgebildet, dass dieses die Statorwicklungen 36 zumindest bereichsweise bedeckt. Das Isolierelement 40 ist vorzugsweise als um die Drehachse 23 des Rotors 26 verlaufend zumindest annähernd geschlossener Ring ausgebildet. In Richtung der Drehachse 23 gesehen erstreckt sich das Isolierelement 40 zumindest über einen Teil der Statorwicklungen 36. Vorzugsweise liegt das wenigstens eine Isolierelement 40 in radialer Richtung bezüglich der Drehachse 23 an den Statorwicklungen 36 an und fixiert diese auf dem Statorgrundkörper 32 bevor das Vergussmaterial 50 eingebracht wird. The insulating element 40 consists of an electrically insulating material, in particular plastic, which has a higher elasticity than the casting material 50. The at least one insulating element 40 is designed such that it covers the stator windings 36 at least in some areas. The insulating element 40 is preferably designed as an at least approximately closed ring running around the axis of rotation 23 of the rotor 26. Seen in the direction of the axis of rotation 23, the insulating element 40 extends at least over part of the stator windings 36. Preferably, the at least one insulating element 40 rests in the radial direction with respect to the axis of rotation 23 on the stator windings 36 and fixes them on the stator base body 32 before the potting material 50 is introduced becomes.
Das Isolierelement 40 ist entsprechend der Innenkontur des Stators 28 ausgebildet und weist einen ersten Abschnitt 42 mit kleinem Außendurchmesser auf, der im mittleren Statorabschnitt 34 angeordnet ist, einen zweiten Abschnitt 44 mit größerem Außendurchmesser, der im Bereich des Wickelkopfs 38 angeordnet ist und einen zumindest annähernd konischen Übergangsabschnitt 46, der im Bereich des Übergangsabschnitts 35 des Stators 28 angeordnet ist. The insulating element 40 is designed according to the inner contour of the stator 28 and has a first section 42 with a small outside diameter, which is arranged in the middle stator section 34, a second section 44 with a larger outside diameter, which is arranged in the area of the winding head 38 and at least approximately conical transition section 46, which is arranged in the area of the transition section 35 of the stator 28.
Es kann vorgesehen sein, dass nur auf einer Seite des Stators 28 ein Isolierelement 40 angeordnet ist. Alternativ kann auf beiden Seiten des Stators 28 jeweils ein Isolierelement 40 angeordnet ist, wobei die Isolierelemente 40 der beiden Seiten vorzugsweise gleich ausgebildet sind. It can be provided that an insulating element 40 is arranged only on one side of the stator 28. Alternatively, an insulating element 40 can be arranged on both sides of the stator 28, with the insulating elements 40 on the two sides preferably having the same design.
Das Isolierelement 40 wird in den Stator 28 von der Seite des Wickelkopfs 38 her eingeführt. Anschließend wird das Vergussmaterial 50 eingebracht, das vorhandene Hohlräume zwischen dem Isolierelement 40 und den Statorwicklungen 36 ausfüllt und außerdem die den Statorwicklungen 36 abgewandte Innenseite 41 des Isolierelements 40 bedeckt. Die Innenseite 41 des Isolierelements 40 kann eine Oberfläche mit hoher Rauhigkeit aufweisen, wodurch die Haftung des Vergussmaterials 50 verbessert ist. In Figur 4 ist das Isolierelement 40 gemäß einem zweiten Ausfprgungsbeispiel dargestellt. Das Isolierelement 40 ist dabei im wesentlichen gleich ausgebildet wie beim ersten Ausführungsbeispiel weist jedoch zusätzlich eine Aufnahme 60 für einen Sensor 62, beispielsweise einen Temperatursensor, auf. Die Aufnahme 60 ist beispielsweise als schlitzförmige Ausnehmung oder Aussparung imThe insulating element 40 is inserted into the stator 28 from the end winding 38 side. The potting material 50 is then introduced, which fills existing cavities between the insulating element 40 and the stator windings 36 and also covers the inside 41 of the insulating element 40 facing away from the stator windings 36. The inside 41 of the insulating element 40 can have a surface with high roughness, whereby the adhesion of the potting material 50 is improved. In Figure 4, the insulating element 40 is shown according to a second exemplary embodiment. The insulating element 40 is designed essentially the same as in the first exemplary embodiment, but additionally has a receptacle 60 for a sensor 62, for example a temperature sensor. The receptacle 60 is, for example, as a slot-shaped recess or recess
Umfang des Isolierelements 40 ausgebildet, die sich ausgehend vom aus dem Stator 28 weisenden Ende des Isolierelements 40 in dessen zweitem Abschnitt 44 erstreckt. Der Sensor 62 kann in die Aufnahme 60 eingeschoben werden nachdem das Isolierelement 40 in den Stator 28 eingefügt ist. Circumference of the insulating element 40 is formed, which extends from the end of the insulating element 40 pointing out of the stator 28 in its second section 44. The sensor 62 can be inserted into the receptacle 60 after the insulating element 40 is inserted into the stator 28.
Der Sensor 62 dient vorzugsweise zur Erfassung der Temperatur der Statorwicklungen 36, insbesondere im Bereich des Wickelkopfs 38. Um einen guten Kontakt des Sensors 62 mit den Statorwicklungen 36 zu gewährleisten kann vorgesehen sein, dass am Isolierelement 40 wenigstens ein am Sensor 62 angreifender und diesen zu den Statorwicklungen 36 drückender federnder Arm angeordnet ist. The sensor 62 is preferably used to detect the temperature of the stator windings 36, in particular in the area of the winding head 38. In order to ensure good contact of the sensor 62 with the stator windings 36, it can be provided that at least one on the insulating element 40 acts on the sensor 62 and closes it the stator windings 36 pressing resilient arm is arranged.

Claims

Ansprüche Expectations
1. Elektromotor, insbesondere für eine Gasfördervorrichtung, mit einem Stator (28) und einem Rotor (26), der vom Stator (28) umgeben ist, wobei der Stator (28) Statorabschnitte (34, 35, 38) mit Statorwicklungen (36) aufweist, wobei zwischen den Statorwicklungen (36) und dem Rotor (26) eine elektrische Isolierung (40; 50) vorgesehen ist, wobei die elektrische Isolierung zumindest ein Vergussmaterial (50) umfasst, dadurch gekennzeichnet, dass die elektrische Isolierung zusätzlich wenigstens ein Isolierelement (40) umfasst, das die Statorwicklungen (36) zumindest bereichsweise bedeckt und das aus einem Material mit einer höheren Elastizität besteht als das Vergussmaterial (50). 1. Electric motor, in particular for a gas delivery device, with a stator (28) and a rotor (26), which is surrounded by the stator (28), the stator (28) having stator sections (34, 35, 38) with stator windings (36). has, wherein an electrical insulation (40; 50) is provided between the stator windings (36) and the rotor (26), the electrical insulation comprising at least one potting material (50), characterized in that the electrical insulation additionally comprises at least one insulating element ( 40), which covers the stator windings (36) at least in some areas and which consists of a material with a higher elasticity than the potting material (50).
2. Elektromotor nach Anspruch 1, dadurch gekennzeichnet, dass sich das wenigstens eine Isolierelement (40) in Richtung der Drehachse (23) des Rotors (26) gesehen zumindest über einen Teil der Längserstreckung der Statorwicklungen (36) erstreckt. 2. Electric motor according to claim 1, characterized in that the at least one insulating element (40) extends at least over part of the longitudinal extent of the stator windings (36) when viewed in the direction of the axis of rotation (23) of the rotor (26).
3. Elektromotor nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das wenigstens eine Isolierelement (40) als um die Drehachse (23) des Rotors (26) umlaufender, zumindest annähernd geschlossener Ring ausgebildet ist. 3. Electric motor according to claim 1 or 2, characterized in that the at least one insulating element (40) is designed as an at least approximately closed ring rotating around the axis of rotation (23) of the rotor (26).
4. Elektromotor nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Außenkontur des wenigstens einen Isolierelements (40) entsprechend der Innenkontur des Stators (36) ausgebildet ist. 4. Electric motor according to one of claims 1 to 3, characterized in that the outer contour of the at least one insulating element (40) is designed to correspond to the inner contour of the stator (36).
5. Elektromotor nach Anspruch 4, dadurch gekennzeichnet, dass der Stator (28) wenigstens zwei Abschnitte (34, 38) mit unterschiedlichen Innendurchmessern aufweist, wobei ein Übergangsabschnitt (35) zwischen den beiden Abschnitten (34, 38) zumindest annähernd konisch ausgebildet ist und dass das wenigstens eine Isolierelement (40) entsprechend zwei Abschnitte (42, 44) mit unterschiedlichen Außendurchmessern und zwischen diesen einen zumindest annähernd konischen Übergangsabschnitt (46) aufweist. Elektromotor nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass durch das wenigstens eine Isolierelement (40) die Statorwicklungen (36) vor Einbringung des Vergussmaterials (50) zumindest bereichsweise fixiert werden. Elektromotor nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das wenigstens eine Isolierelement (40) auf seiner den Statorwicklungen (36) abgewandten Innenseite (41) eine Oberfläche mit hoher Rauhigkeit aufweist. Elektromotor nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das wenigstens eine Isolierelement (40) wenigstens eine Aufnahme (60) für wenigstens einen Sensor (62) aufweist. Elektromotor nach Anspruch 8, dadurch gekennzeichnet, dass die Aufnahme (60) als Ausnehmung oder Aussparung im wenigstens einen Isolierelement (40) ausgebildet ist. Elektromotor nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass der Sensor (62) ein Temperatursensor ist, durch den vorzugsweise die Temperatur der Statorwicklungen (36) erfasst wird. 5. Electric motor according to claim 4, characterized in that the stator (28) has at least two sections (34, 38) with different inner diameters, a transition section (35) between the two sections (34, 38) being at least approximately conical and that the at least one insulating element (40) corresponds to two sections (42, 44) with different outer diameters and between this has an at least approximately conical transition section (46). Electric motor according to one of the preceding claims, characterized in that the stator windings (36) are fixed at least in areas by the at least one insulating element (40) before the potting material (50) is introduced. Electric motor according to one of the preceding claims, characterized in that the at least one insulating element (40) has a surface with high roughness on its inside (41) facing away from the stator windings (36). Electric motor according to one of the preceding claims, characterized in that the at least one insulating element (40) has at least one receptacle (60) for at least one sensor (62). Electric motor according to claim 8, characterized in that the receptacle (60) is designed as a recess or recess in the at least one insulating element (40). Electric motor according to claim 8 or 9, characterized in that the sensor (62) is a temperature sensor, which preferably detects the temperature of the stator windings (36).
PCT/EP2023/071479 2022-08-26 2023-08-02 Electric motor WO2024041864A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080115527A1 (en) * 2006-10-06 2008-05-22 Doty Mark C High capacity chiller compressor
US20180241271A1 (en) * 2014-09-29 2018-08-23 Siemens Aktiengesellschaft Active Part Formed As A Rotor Or Stator, A Method For Producing The Active Part, And An Electrical Machine
US20190058369A1 (en) * 2017-08-18 2019-02-21 Shanghai XPT Technology Limited Method of encapsulating induction motor stator
DE102018201162A1 (en) 2018-01-25 2019-07-25 Robert Bosch Gmbh Turbomachine, in particular for a fuel cell system
WO2021037446A1 (en) * 2019-08-26 2021-03-04 Siemens Energy Global GmbH & Co. KG Hybrid material with fibre reinforcement for producing a moulded body, moulded body, and use therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080115527A1 (en) * 2006-10-06 2008-05-22 Doty Mark C High capacity chiller compressor
US20180241271A1 (en) * 2014-09-29 2018-08-23 Siemens Aktiengesellschaft Active Part Formed As A Rotor Or Stator, A Method For Producing The Active Part, And An Electrical Machine
US20190058369A1 (en) * 2017-08-18 2019-02-21 Shanghai XPT Technology Limited Method of encapsulating induction motor stator
DE102018201162A1 (en) 2018-01-25 2019-07-25 Robert Bosch Gmbh Turbomachine, in particular for a fuel cell system
WO2021037446A1 (en) * 2019-08-26 2021-03-04 Siemens Energy Global GmbH & Co. KG Hybrid material with fibre reinforcement for producing a moulded body, moulded body, and use therefor

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