WO2019043053A1 - Dispositif d'isolation - Google Patents

Dispositif d'isolation Download PDF

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Publication number
WO2019043053A1
WO2019043053A1 PCT/EP2018/073220 EP2018073220W WO2019043053A1 WO 2019043053 A1 WO2019043053 A1 WO 2019043053A1 EP 2018073220 W EP2018073220 W EP 2018073220W WO 2019043053 A1 WO2019043053 A1 WO 2019043053A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulating device
layer
stator
insulating
coil
Prior art date
Application number
PCT/EP2018/073220
Other languages
German (de)
English (en)
Inventor
Frank Eisele
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 WO2019043053A1 publication Critical patent/WO2019043053A1/fr

Links

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
    • H02K3/325—Windings characterised by the shape, form or construction of the insulation for windings on salient poles, such as claw-shaped poles
    • 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
    • H02K15/10—Applying solid insulation to windings, stators or rotors

Definitions

  • coils are used as actuators for stators or rotors.
  • the coils are usually arranged in grooves of the stator or the rotor. To ensure that the built-in coils are not short-circuited via the stator or via the rotor, the coils are insulated from the stator or the rotor.
  • insulation there are different types of insulation known, for example by means of an insulating paper that is inserted in the grooves. Prior to insertion into the grooves, the insulation paper is processed by means of roller embossing tools and punching tools in order to bring the insulation paper into the correct shape and to produce bending edges at which the insulation paper is bent during assembly. Alternatively, the isolation can be realized by means of molded plastic end shafts manholes. Another known measure is to inject the grooves with an insulating material by means of injection molding technology.
  • the invention relates to an insulating device for electrical insulation of a coil of an electrical machine, wherein the insulating device comprises at least one mounting aid on which the insulating device is bent during assembly. It is proposed that the at least one mounting aid is produced by means of a laser irradiation.
  • the manufacture of the assembly aid can thereby be improved by replacing the use of a plurality of roller embossing tools by the use of a laser, in particular a single laser.
  • An insulating device should be understood as meaning, in particular, a means or a component which is designed to be a stator or a rotor of the Electric motor from the coil in the high voltage range to electrically isolate. Additionally or alternatively, it is also conceivable that the insulating device is designed to insulate two coils from each other. Preferably, the insulating device is further configured to hold the coil in a mold.
  • the stator and / or the rotor are each formed from a laminated core, which advantageously prevents eddy currents from a solid material construction and the efficiency can be increased.
  • the coil is in particular made of an electrical conductor, in particular of a metallic wire, preferably of a copper wire, which is wound into a coil by means of a winding method.
  • the metallic conductor preferably has an insulating layer in order to isolate the regions of the electrical conductor resting on one another in the wound state.
  • the insulating layer is preferably formed from an insulating lacquer layer.
  • the electrical conductor has a sliding layer, which facilitates the winding.
  • An electric machine should in particular be understood to mean an electromechanical converter which is designed to convert electrical power into mechanical power as an electric motor or to convert mechanical power into electrical power as a generator.
  • the electric motor is preferably designed as a brushless DC motor, BLDC for short, or as an AC motor.
  • the electric motor may be designed as a synchronous motor or as an asynchronous motor.
  • the electric motor can be connected via a cable connection directly or indirectly via an electronic system with a power supply.
  • the power supply can be realized for example via a mains connection or via a rechargeable battery pack.
  • An assembly aid is to be understood in the context of this application in particular a structural modification of the insulating device, which facilitates the assembly of the electric motor, preferably the assembly or the installation of the coil in the stator.
  • the structural modification of the insulating device may, for example, be a local weakening of the insulating device or of the material of the insulating device caused by a damage. tion of the material is caused. It is also conceivable that the local weakening is realized by a local removal of the material of the insulating device. Alternatively or additionally, it is also conceivable that the structural modification is designed as a local strengthening of the insulating device, whereby advantageously at critical points during assembly damage to the
  • the structural modification may also be embodied as a change in the material, in particular the chemical composition of the material, of the insulating device.
  • the insulating device is preferably arranged between the stator and the coil.
  • the insulating device is arranged in particular in at least one winding groove of the stator.
  • a shape of the insulating device is particularly adapted to a shape of the winding groove.
  • the winding groove has a cross-sectional area which has at least one corner, preferably a polygonal shape, such as, for example, rectangular or pentagonal.
  • the corners each form an edge along a longitudinal extension of the stator.
  • the mounting aids of the insulating device preferably have the same spacings as the corners or the edges of the winding groove.
  • the corners or the edges in particular have an opening angle of at least 30 °, preferably at least 60 °.
  • a laser irradiation is to be understood as meaning, in particular, an application of a laser for the structural modification of the insulating device.
  • the laser can be designed as a continuous wave laser or as a pulsed laser.
  • the laser is focused via optics on a surface of the insulating device.
  • the laser is focused on the insulating device such that the spot size of the laser on the insulating device is less than 2 mm, preferably less than 1 mm, preferably less than 0.1 mm.
  • the mounting aid is designed as a groove.
  • this can weaken the insulating device in the region of the groove in such a way that folding or bending of the insulating device is prevented.
  • the groove may be formed parallel or obliquely to a longitudinal extent of the electric motor or to the longitudinal extension of the stator.
  • the groove has in particular a width of less than 1 mm, preferably a width of less than 0.5 mm, preferably a width in the range of 0.1 mm to 0.5 mm.
  • the insulating device is designed to be multi-layered.
  • an insulating device with a high strength and a good insulating property can be realized thereby.
  • the insulating device is preferably formed from at least two different layers.
  • the insulating device may comprise two substantially equal layers which are spaced from each other by at least one further layer.
  • a substantially identical layer is to be understood in particular as meaning a layer of the same material, preferably of the same material and having the same layer thicknesses.
  • a first layer is mounted on the side of the coil in the mounted state. Furthermore, it is proposed that the first layer of the insulating device is formed as a connecting layer, which is provided for the material connection of the insulating device with the coil. Furthermore, it is proposed that the first layer is formed from a baked enamel. Advantageously, thereby an optimal connection between the insulating device and the coil can be ensured.
  • the mounting aid is arranged in the first layer, in particular in the first and the second layer, preferably in the first, in the second and in the third layer.
  • the assembly can be further simplified.
  • the mounting aid can be arranged completely or partially in the respective layer.
  • the mounting aid is arranged at a distance from a last layer.
  • the mounting aid has at least one layer in which the mounting aid is not is arranged.
  • the mounting aid is preferably arranged at a distance from at least one layer consisting of a polymer film.
  • the last layer is formed from a polymer film.
  • the polymer film may be formed, for example, as an aramid or polyaramid-containing film.
  • the polymer film may also be formed as a polyester-containing film.
  • the polymer film may also be formed as a polyimide-containing film.
  • the insulating device has at least one fiber-containing layer.
  • the fibrous layer may comprise or consist of vegetable fibers.
  • the fibrous layer comprises cellulose.
  • the fiber-containing layer comprises or consists of animal or mineral fibers.
  • the fibrous layer comprises or consists of man-made fibers.
  • the chemical fibers may be formed from natural or synthetic or polymers or inorganic materials.
  • the mounting aid is arranged in at least one fiber-containing layer, wherein a layer thickness of the fiber-containing layer is always greater than an extension of the mounting aid along the layer thickness.
  • this ensures that the insulating device does not tear in the area of the assembly aid.
  • the mounting aid is spaced from at least one fibrous layer.
  • the invention relates to a method for producing a mounting aid of an insulating device as described above.
  • the side edges of the insulating device are additionally produced by means of the laser irradiation.
  • both the shape of the insulating device can be cut to size by means of the laser irradiation, and the assembly aid can also be produced.
  • the same laser is used for cutting the insulating device and for producing the mounting aid.
  • the intensity of the laser irradiation on the insulating device during cutting is greater than in the production of the assembly aid.
  • the insulating device is cut by means of a laser irradiation of a first laser and the mounting aids are produced by means of a laser irradiation of a second laser.
  • the invention relates to an electric motor, in particular a BLDC or AC motor, with an insulating device, as described above, wherein the insulating device is placed around at least one stator coil.
  • FIG. 1 shows a longitudinal section of an electric motor.
  • Fig. 2a an insulating device according to the invention
  • FIG. 2b shows a section through the insulating device according to the invention in front of a
  • Fig. 2c is a section through the insulating device according to the invention according to the
  • 3a shows a perspective view of a stator with inserted insulating device
  • 3b is a perspective view of a mounted stator
  • FIG. 4a shows a further embodiment of the insulating device according to the invention.
  • FIG. 4a before a laser irradiation
  • Fig. 4c is a section through the insulating device according to the invention according to
  • Fig. 5a shows another embodiment of the stator
  • FIG. 5b shows a coil with the insulating device according to FIG. 4a;
  • FIG. 5c shows a stator half of the stator according to FIG. 5a with the insulating device according to FIG. 4a in the assembled state.
  • FIG. 1 designed as an electric motor 12 electrical machine 10 is shown in a longitudinal section.
  • the electric motor 12 is exemplified as a brushless direct current motor. Since such electric motors are well known in the art, reference is made to this for a detailed description of the structure and operation of the electric motor.
  • the electric motor 12 is designed as an internal rotor, wherein it is also conceivable for the electric motor 12 to be designed as an external rotor.
  • the electric motor 12 has a cylindrical rotor 14, which is non-rotatably connected to a drive shaft 16, on.
  • the electric motor 12 is rotatably mounted in a housing, not shown, via two bearing assemblies 18, which are designed as ball bearings.
  • the rotor 14 is coaxially disposed within a substantially hollow cylindrical stator 20.
  • the stator 20 is formed of a laminated core.
  • the stator 20 is designed as a magnetically conductive, laminated or sintered laminated core.
  • the stator 20 has winding grooves 22, which extend along a longitudinal extent 24 of the electric motor 12.
  • the longitudinal extension 24 corresponds to the axis of rotation of the drive shaft 16.
  • In the winding grooves 22 at least one coil 26 is arranged in each case.
  • the coil 26 is formed of an electrical conductor 28, which is wound during the assembly of the electric motor 12 to a coil 26.
  • the electrical conductor 28 is formed from a copper wire, which is coated with an insulating lacquer layer.
  • different types and methods of coil winding technology are conceivable.
  • this may be a wild winding, an orthocyclic winding, a helical winding, or the like.
  • the coils 26 can be connected via a connection, not shown, to a power supply. In the energized state can be induced by the coils 26, a magnetic field to a magnetization of the stator 20 and thus to drive the electric motor 12.
  • the electric motor 12 is designed in particular as a high voltage motor.
  • an insulating device 30 is arranged between the stator 20 and the coil 26. The insulating device 30 is arranged in particular radially to the longitudinal extent 24 of the electric motor 12 between the stator 20 and the coil 26.
  • an end plate 32 is arranged, which is formed of an insulating material.
  • the end plate 32 may be formed, for example, of a ceramic material or a hard plastic. Via the end plate 32, the coil 26 is in particular electrically insulated axially from the stator 20.
  • the insulating device 30 is shown in a plan view.
  • the insulating device 30 is formed as an insulating paper.
  • the insulating device 30 has an outer contour which has been produced by cutting by means of a laser irradiation.
  • the insulating device 30 has a plurality of mounting aids 34, which are each formed as a groove 36.
  • the mounting aids 34 in this embodiment were also made by means of laser irradiation, whereby the intensity of a laser was reduced compared to the cutting.
  • the mounting aids 34 extend straight from one end of the insulating device 30 to the opposite end.
  • the mounting aids 34 are arranged parallel to each other.
  • the mounting aids 34 extend in the mounted state along the longitudinal extension 24 of the electric motor 12.
  • the outer contour of the insulating device 30 is adapted in this embodiment to the shape of the winding grooves 22 of the stator 20.
  • the axial length of the insulating device 30 is greater than in the areas in which the insulating device 30 encloses no coil 26.
  • FIG. 2b shows a section through the insulating device 30 before the laser irradiation.
  • the insulating device 30 has, for example, four layers 38, 40, 42, 44. The insulating device 30 is irradiated in particular on the side on which the first layer 38 is located.
  • the first layer 38 is formed as a bonding layer.
  • the first layer 38 consists for example of a baked enamel.
  • the baked enamel consists of a resin coating.
  • the second layer 40 consists of a polymer film, in particular a polyester film, for example of polyethylene terephthalate.
  • the third layer 42 is formed as a fibrous layer.
  • the third layer 42 is formed from a roll pressboard, for example from a sulfate pulp.
  • the fourth layer 44 essentially corresponds in its thickness and its material to the second layer 40.
  • the insulating device 30 has a durbolt voltage of at least 10 kV, preferably at least 15 kV. In FIG. 2c shows a section through the insulating device 30 after the laser irradiation.
  • the material of the first layer 38 and the second layer 40 is completely local and the material of the third layer 42 is partially removed.
  • the folding or bending of the insulating device 30 is facilitated. Since the fibrous layer 40 is locally removed only partially by the laser treatment, it can be ensured that the tensile strength and tear strength of the insulating device 30 are not excessively affected by the mounting aid 34.
  • the polymer layer 44 is advantageously arranged at any point at a distance from the mounting aid, so that the electrical insulation effect of this layer is not influenced by the laser treatment.
  • the stator 20 is shown with insulator 30 inserted.
  • the stator 20 is formed as a closed stator 20 of a single laminated core.
  • the stator 20 has two winding grooves 22.
  • the insulating device 30 is located only in one of the two winding grooves 22.
  • the contour of the winding groove 22 has a plurality of flat and curved portions 46, 48 which are connected by sharp or soft edges 50, 52 with each other.
  • a planar portion 46 merges into an adjacent planar portion 46.
  • a bent portion 48 merges into an adjacent bent or flat portion 46, 48.
  • the distance between the edges 50, 52 of each other substantially corresponds to the distance of the mounting aids 34 of the insulating device 30 from each other.
  • the insulating device 30 is first inserted into the winding groove 22 before the stator 20 is wound directly.
  • the insulating device 30 projects partially out of the stator 20, in particular out of the winding groove 22, out.
  • the axial length of the insulating device 30 extends beyond a length of the stator 20 in the areas in which the winding groove 22 is provided for receiving the coil 26.
  • the stator 20 is shown wound in the coil 26 state. The two coils 26 are each received by two winding grooves 22 of the stator 20.
  • FIG. 4a shows an alternative embodiment of the insulating device 30a.
  • the insulating device 30a has a substantially rectangular outer contour.
  • the insulating device 30a has four mounting aids 34a, which are formed analogously to the previously described embodiment of a rectilinearly extending groove 36a.
  • FIG. 4b shows a section through the insulating device 30a before the laser irradiation.
  • the insulating device 30a is composed of three layers 38a, 40a, 42a, wherein the first layer 38a is formed of a press chip, the second layer 40a of a polymer film, and the third layer 42a of a press jig.
  • FIG. 4c shows a section through the insulating device after the laser irradiation.
  • the mounting aid 34a is preferably spaced from the second 40a and spaced from the third layer 42a.
  • FIG. 5a shows a cross section of the stator 20a.
  • the stator 20a is formed as a split stator 20a.
  • the stator 20a has two stator halves 54a, which are positively connected to one another.
  • Each stator half 54a has two winding grooves 56a.
  • two winding grooves 56a of the stator halves 54a together form a winding groove 22a of the stator 20a.
  • the coil 26a is formed as an air-core coil.
  • the insulating device 30a is thus initially folded at the positions of the mounting aids 34a during assembly so that the insulating device 30a surrounds the coil 26a in regions.
  • the insulating device 30a is bent or folded on the four mounting aids 34a such that the insulating device has a substantially rectangular cross-section. So that the insulating device 30a does not come loose, the shape of the insulating device 30a is fixed around the coil 26a by means of a fixing element 58a formed as an adhesive tape. For assembly, the coil 26a, which is partially enclosed by two insulating device 30a, inserted into two winding grooves 56a of a stator half 54a (see Figure 5c).

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

Abstract

L'invention concerne un dispositif d'isolation pour isoler électriquement une bobine d'une machine électrique, ce dispositif d'isolation comprenant au moins un moyen d'aide au montage au niveau duquel il est plié lors du montage. Selon l'invention, le ou les moyens d'aide au montage sont produits par irradiation par laser.
PCT/EP2018/073220 2017-08-31 2018-08-29 Dispositif d'isolation WO2019043053A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017215248.6 2017-08-31
DE102017215248.6A DE102017215248A1 (de) 2017-08-31 2017-08-31 Isoliervorrichtung

Publications (1)

Publication Number Publication Date
WO2019043053A1 true WO2019043053A1 (fr) 2019-03-07

Family

ID=63517856

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/073220 WO2019043053A1 (fr) 2017-08-31 2018-08-29 Dispositif d'isolation

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DE (1) DE102017215248A1 (fr)
WO (1) WO2019043053A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019205101A1 (de) * 2019-04-10 2020-10-15 Audi Ag Verfahren zum Herstellen eines elektromechanischen Bauteils

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2723583A1 (de) * 1977-05-04 1978-11-09 Bbc Brown Boveri & Cie Verbundmaterial
JPH06275924A (ja) * 1993-03-22 1994-09-30 Ngk Spark Plug Co Ltd セラミック基板
JP2001136700A (ja) * 1999-11-02 2001-05-18 Mitsubishi Electric Corp 固定子および固定子の製造方法
JP2013192363A (ja) * 2012-03-14 2013-09-26 Aichi Elec Co 絶縁シート製造方法および絶縁シート製造装置
DE112013004576T5 (de) * 2012-10-11 2015-06-25 Hitachi, Ltd. Isolationsaufbau für eine rotierende elektrische Maschine und Verfahren zu dessen Herstellung
WO2015158992A1 (fr) * 2014-04-17 2015-10-22 Valeo Equipements Electriques Moteur Stator de machine électrique muni d'isolants d'encoche individuels et procédé de réalisation du stator correspondant
JP2016054634A (ja) * 2014-08-28 2016-04-14 ゼネラル・エレクトリック・カンパニイ ロータのスロットライナ
WO2017190943A1 (fr) * 2016-05-02 2017-11-09 Robert Bosch Gmbh Procédé et dispositif de fabrication d'un élément d'isolation
JP2018093593A (ja) * 2016-11-30 2018-06-14 アイチエレック株式会社 回転機

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2723583A1 (de) * 1977-05-04 1978-11-09 Bbc Brown Boveri & Cie Verbundmaterial
JPH06275924A (ja) * 1993-03-22 1994-09-30 Ngk Spark Plug Co Ltd セラミック基板
JP2001136700A (ja) * 1999-11-02 2001-05-18 Mitsubishi Electric Corp 固定子および固定子の製造方法
JP2013192363A (ja) * 2012-03-14 2013-09-26 Aichi Elec Co 絶縁シート製造方法および絶縁シート製造装置
DE112013004576T5 (de) * 2012-10-11 2015-06-25 Hitachi, Ltd. Isolationsaufbau für eine rotierende elektrische Maschine und Verfahren zu dessen Herstellung
WO2015158992A1 (fr) * 2014-04-17 2015-10-22 Valeo Equipements Electriques Moteur Stator de machine électrique muni d'isolants d'encoche individuels et procédé de réalisation du stator correspondant
JP2016054634A (ja) * 2014-08-28 2016-04-14 ゼネラル・エレクトリック・カンパニイ ロータのスロットライナ
WO2017190943A1 (fr) * 2016-05-02 2017-11-09 Robert Bosch Gmbh Procédé et dispositif de fabrication d'un élément d'isolation
JP2018093593A (ja) * 2016-11-30 2018-06-14 アイチエレック株式会社 回転機

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