WO2022184351A1 - Stator pour une machine électrique, machine électrique, procédé de fabrication d'un stator et utilisation d'un papier isolant - Google Patents

Stator pour une machine électrique, machine électrique, procédé de fabrication d'un stator et utilisation d'un papier isolant Download PDF

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Publication number
WO2022184351A1
WO2022184351A1 PCT/EP2022/052116 EP2022052116W WO2022184351A1 WO 2022184351 A1 WO2022184351 A1 WO 2022184351A1 EP 2022052116 W EP2022052116 W EP 2022052116W WO 2022184351 A1 WO2022184351 A1 WO 2022184351A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
insulating
stator core
coating
conductive material
Prior art date
Application number
PCT/EP2022/052116
Other languages
German (de)
English (en)
Inventor
Markus PECHINGER
Sebastian Hoffmann
Jochen Wessner
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 WO2022184351A1 publication Critical patent/WO2022184351A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
    • H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation
    • 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
    • H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges

Definitions

  • the invention relates to a stator for an electrical machine, in particular a turbomachine. Furthermore, the invention relates to an electrical machine, in particular a special turbomachine, with a corresponding stator.
  • the electric machine, in particular a turbomachine can be used as an air compressor in a fuel cell system, for example.
  • the invention relates to a method for producing a stator and the use of an insulating paper in a stator.
  • Fuel cell systems require oxygen, which reacts in a fuel cell of the system with a fuel, in particular hydrogen, to form water or water vapor. In this way, an electrical power is generated by electrochemical conversion, which can be used as drive energy, for example to drive a vehicle.
  • Ambient air which is supplied to the fuel cell by means of an air compression system, usually serves as the oxygen source. Because the process in the fuel cells requires a certain air mass flow and a certain pressure level.
  • air compression systems use high-speed turbomachines that are driven by an electric motor that includes a stator.
  • DE 102018219 846 A1 shows an example of an electric motor with a stator, which includes a stator core and conductor elements placed around it and forming coils.
  • insulating means are provided to be interposed between the stator core and the conductive elements. Folded paper elements serve as insulation. These can have a resin coating to improve the heat dissipation of the electric motor. At the same time, the insulator is held in place by the resin coating.
  • Insulating means of the type mentioned above have the disadvantage that partial discharges can occur as a result of locally high field strengths in the region of the stator core. This must be prevented. It is to this object that the present invention is directed.
  • stator with the features of claim 1 and the method with the features of claim 6 are proposed.
  • Advantageous further developments of the invention can be found in the respective dependent claims.
  • an electrical machine with a stator according to the invention and a use for an insulating paper are specified.
  • the stator proposed for an electrical machine in particular a turbomachine, comprises a stator core with a plurality of slot-shaped receptacles for windings of stator coils, with insulating means in the form of coated insulating paper being arranged in the receptacles.
  • the insulating papers each have a coating of an electrically conductive material on one or both sides.
  • the coating of an electrically conductive material ensures that the field strength of the coated surface is at the same potential as the stator core, so that unwanted discharge does not occur.
  • the coating of an electrically conductive material can be applied to one or both sides of the insulation paper.
  • the insulating papers preferably have a coating of an electrically conductive material at least on the side facing the stator core. That means that at least the Side that comes in contact with the stator core is coated. This ensures that there is no undesired discharge in the contact area.
  • the coating made of an electrically conductive material is a foil that is rolled up and/or glued on.
  • a foil facilitates the production of the coating, in particular a coating with a uniform thickness.
  • surface areas can be left out in a simple manner so that they remain uncoated.
  • a coating of an electrically conductive material can be dispensed with in surface areas that do not come into contact with the stator core. In particular, these can be surface areas that protrude beyond the stator core in the axial direction.
  • the insulating papers preferably completely line the receptacles of the stator core.
  • the insulating paper thus ensures that no winding of a stator coil comes into contact with the stator core.
  • the insulating papers are preferably in full contact with the surfaces of the stator core delimiting the receptacles, so that they are in contact with the stator core via their coating made of an electrically conductive material.
  • the receptacles of the stator core are preferably arranged at the same angular distance from one another. Furthermore, all of the receptacles are preferably of the same design. Accordingly, the insulating papers used here can all be of the same design. This simplifies the manufacture of the insulating papers.
  • the receptacles preferably each have an opening on an inner circumference of the stator core.
  • the opening is preferably covered by the respective insulating paper or another insulating paper, so that the receptacles are lined with insulating paper all around. Several pieces of paper can also be arranged so that they overlap.
  • the electrical machine that is also proposed, in particular a turbomachine, is characterized in that it has a stator according to the invention and a rotor that interacts with the stator.
  • the advantages of the invention also apply here. If the electrical machine is a turbomachine, it can be used in particular in a fuel cell system as an air compressor.
  • a method for producing a stator for an electrical machine in particular a turbomachine, is proposed.
  • insulating means are inserted into slot-shaped receptacles of a stator core, with insulating paper being used as the insulating means, which papers have previously been coated on one or both sides with an electrically conductive material.
  • a stator according to the invention can therefore be produced in particular.
  • a foil made of an electrically conductive material is used for coating, which foil is rolled up and/or glued onto the insulating paper.
  • the use of a foil simplifies the coating of the insulation paper, so that the manufacturing costs are kept low.
  • the use of a film ensures the formation of a uniform coating or a uniform coating thickness. By rolling it up and/or sticking it on, the coating can be in full-surface contact with the insulating paper, so that good adhesion is ensured.
  • an insulating paper coated on one or both sides with an electrically conductive material is proposed as an insulating means between a coil winding and a stator core of a stator.
  • the use of insulating paper coated with an electrically conductive material as an insulating medium prevents the build-up of large local field strengths, so that unwanted discharge does not occur. This applies in particular to inhomogeneous Anla ge of the insulation paper on the stator core.
  • Fig. 1 is a schematic plan view of a stator core of a stator according to the invention and Fig. 2 shows a schematic cross section through an insulating paper of the stator core of Fig. 1.
  • FIG. 1 shows an example of a top view of a stator core 2 of a stator 1 according to the invention.
  • the stator core 2 has a multiplicity of slot-shaped receptacles 3 which are arranged around a longitudinal axis 10 at the same angular distance from one another.
  • the recordings 3 are used to accommodate coil windings (not shown) to form the stator coils (not shown).
  • 3 insulating papers 4 are used as insulating means in the on. These line the receptacles 3 completely and also extend over openings 8 of the receptacles 3 that are formed on an inner circumference 7 of the stator core 2 .
  • the insulating papers 4 used in the receptacles 3 are coated on at least one side with an electrically conductive material.
  • a coating 5 made of an electrically conductive material is applied on at least one side.
  • the coating 5 is arranged on a side 6 which faces outwards or the stator core 2 when the insulation paper 4 is inserted into the receptacle 3 .
  • the coating 5 can in particular be a rolled-up and/or glued-on foil.
  • the other side 9 facing inwards can remain uncoated since it does not come into contact with the stator core 2 . Because the task of the coating 5 is to bring the surface of the insulating paper 4 that is in contact with the stator core 2 to the same potential, in order in this way to avoid an undesired electrical discharge.
  • the insulating paper 4 can be rolled and/or folded in such a way that a longitudinally extending joint area is formed.
  • the width of the insulating paper 4 is preferably selected to be slightly larger than the circumference of the receptacle 3, so that after insertion into the receptacle 3 the longitudinal edges of the insulating paper 4 overlap one another.

Landscapes

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

Abstract

L'invention concerne un stator (1) pour une machine électrique, plus particulièrement une turbomachine, comprenant un noyau de stator (2) comportant une pluralité de réceptacles en forme d'espaces (3) pour des enroulements de bobines de stator, un moyen d'isolation en forme de papiers isolants enrobés (4) étant disposé dans les réceptacles (3). Selon l'invention, chacun des papiers isolants (4) comporte, sur un côté ou sur les deux côtés, un enrobage (5) en un matériau conducteur. L'invention concerne également une machine électrique, plus particulièrement une turbomachine, comprenant un stator (1) correspondant, un procédé de fabrication d'un stator (1) et l'utilisation d'un papier isolant (4).
PCT/EP2022/052116 2021-03-02 2022-01-28 Stator pour une machine électrique, machine électrique, procédé de fabrication d'un stator et utilisation d'un papier isolant WO2022184351A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021201993.5 2021-03-02
DE102021201993.5A DE102021201993A1 (de) 2021-03-02 2021-03-02 Stator für eine elektrische Maschine, elektrische Maschine, Verfahren zur Herstellung eines Stators sowie Verwendung eines Isolationspapiers

Publications (1)

Publication Number Publication Date
WO2022184351A1 true WO2022184351A1 (fr) 2022-09-09

Family

ID=80447893

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2022/052116 WO2022184351A1 (fr) 2021-03-02 2022-01-28 Stator pour une machine électrique, machine électrique, procédé de fabrication d'un stator et utilisation d'un papier isolant

Country Status (2)

Country Link
DE (1) DE102021201993A1 (fr)
WO (1) WO2022184351A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017218451A1 (de) * 2017-10-16 2019-04-18 Robert Bosch Gmbh Stator und elektrische Maschine mit Stator
DE102018219846A1 (de) 2018-11-20 2020-05-20 Robert Bosch Gmbh Isoliermittel für einen Stator eines Elektromotors sowie zugehöriger Stator und Verfahren zur Herstellung des Stators
US20200227968A1 (en) * 2017-10-13 2020-07-16 Hitachi Industrial Products, Ltd. Rotating Electric Machine
DE102019211267A1 (de) * 2019-07-30 2021-02-04 Rolls-Royce Deutschland Ltd & Co Kg Spulenanordnung für eine elektrische Maschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200227968A1 (en) * 2017-10-13 2020-07-16 Hitachi Industrial Products, Ltd. Rotating Electric Machine
DE102017218451A1 (de) * 2017-10-16 2019-04-18 Robert Bosch Gmbh Stator und elektrische Maschine mit Stator
DE102018219846A1 (de) 2018-11-20 2020-05-20 Robert Bosch Gmbh Isoliermittel für einen Stator eines Elektromotors sowie zugehöriger Stator und Verfahren zur Herstellung des Stators
DE102019211267A1 (de) * 2019-07-30 2021-02-04 Rolls-Royce Deutschland Ltd & Co Kg Spulenanordnung für eine elektrische Maschine

Also Published As

Publication number Publication date
DE102021201993A1 (de) 2022-09-08

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