EP3884567A1 - Machine électrique, en particulier pour véhicule - Google Patents

Machine électrique, en particulier pour véhicule

Info

Publication number
EP3884567A1
EP3884567A1 EP19805268.0A EP19805268A EP3884567A1 EP 3884567 A1 EP3884567 A1 EP 3884567A1 EP 19805268 A EP19805268 A EP 19805268A EP 3884567 A1 EP3884567 A1 EP 3884567A1
Authority
EP
European Patent Office
Prior art keywords
stator
plastic
electrical machine
machine according
plastic material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19805268.0A
Other languages
German (de)
English (en)
Inventor
Roberto Almeida e Silva
Bernd Blankenbach
Terry Cox
Philip GRABHERR
Niklas Kull
Tim Male
Peter Pisek
Peter Sever
Josef Sonntag
Martin Williams
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.)
Mahle International GmbH
Original Assignee
Mahle International 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 Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP3884567A1 publication Critical patent/EP3884567A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
    • 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
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
    • H02K9/227—Heat sinks

Definitions

  • the invention relates to an electrical machine, in particular for a vehicle, and a vehicle with such a machine.
  • Such an electrical machine can generally be an electric motor or a generator.
  • the electrical machine can be designed as an external rotor or as an internal rotor.
  • a generic machine for example from US 5,214,325 be. It comprises a housing which surrounds an interior and which has a circumferential circumferential direction of the housing, radially bordering the interior, axially on the one hand an axially delimiting rear wall and axially on the other hand an axially delimiting front wall.
  • a machine stator is firmly connected to the jacket.
  • a rotor of the machine is arranged in the stator, a rotor shaft of the rotor being rotatably mounted on a front shaft bearing on the front wall.
  • the stator of a conventional electrical machine comprises stator windings which are supplied with electrical current during operation of the machine. This creates heat, which must be dissipated to avoid overheating and associated damage or even destruction of the stator.
  • Flierzu it is known from conventional electrical machines to equip them with a cooling device for cooling the stator - in particular said stator windings.
  • a cooling device comprises one or more cooling channels through which a coolant flows and in the vicinity of the Stator windings are arranged in the stator. Heat can be dissipated from the stator by heat transfer from the stator windings to the coolant.
  • an object of the present invention to provide an improved embodiment for an electrical machine in which this disadvantage is largely or completely eliminated.
  • an improved embodiment for an electrical machine is to be created, which is characterized by improved cooling of the stator windings of the stator.
  • the basic idea of the invention is accordingly to embed the stator windings of an electrical machine together with a coolant through which a coolant can flow for cooling the stator windings in a plastic which typically combines electrically insulating and heat-conducting properties.
  • the plastic as a heat transfer medium for the transfer of heat from the stator windings to the coolant flowing through the cooling channel on the one hand and as an electrical insulator for the stator windings on the other hand, we act.
  • a particularly good heat transfer between the stator windings and the coolant guided through the cooling channel is produced. This is especially true if a plastic is used that has a high thermal conductivity.
  • the plastic With electrically insulating properties it is additionally ensured that the stator windings to be cooled are not undesirably electrically short-circuited with the plastic guided through the cooling channel by the electrical plastic. It also ensures that the - typically electrically conductive coolant - when it flows through the cooling channel, is electrically isolated from that of the stator windings. In addition, the plastic can also be used to electrically isolate the stator teeth as part of the stator from the stator windings.
  • the direct thermal coupling of the cooling channel with the coolant to the stator windings to be cooled with the aid of the plastic essential to the invention leads to a particularly effective cooling of the stator windings compared to conventional cooling devices. In this way, even when there is a high level of waste heat development in the stator, such as occurs, for example, during high-load operation of the electrical machine, it can be ensured that the waste heat generated can be dissipated from the stator. Damage or even destruction of the electrical machine due to overheating of the stator can thus be avoided.
  • An electrical machine in particular for a vehicle, comprises a rotor which can be rotated about an axis of rotation by which an axial direction of the electrical machine is defined. Furthermore, the machine comprises a stator which has electrically conductive stator windings and at least one cooling channel through which a coolant can flow for cooling the stator windings.
  • the stator has stator teeth which extend along the axial direction and are spaced apart from one another along a circumferential direction of the rotor and which carry the stator windings.
  • At least one cooling duct and at least one stator winding are arranged in at least one intermediate space that is formed between two stator teeth that are adjacent in the circumferential direction. According to the invention is in the space Plastic is arranged to transfer heat from the stator winding to the cooling channel.
  • the plastic is therefore preferably designed to conduct heat.
  • the plastic can also expediently be designed to be electrically insulating, ie it can consist of an electrically insulating plastic material.
  • the plastic is at least partially arranged on the surface sections of the two adjacent stator teeth delimiting the intermediate space.
  • the cooling duct and the stator winding are preferably electrically opposite each other by means of the plastic
  • Stator teeth insulated and connected to each other in a heat-conducting manner.
  • the stator comprises a stator body, from which the stator teeth protrude radially inwards.
  • the plastic is arranged on a surface section of the stator body which borders the space radially outside.
  • the plastic is particularly preferably arranged on all the spaces delimiting the surface sections of the two stator teeth, that is to say both on the circumferential and radial delimitation of the space in question. In this way it can be excluded that an undesired electrical connection can arise between the electrically conductive material of the stator windings and the likewise electrically conductive stator teeth.
  • the plastic arranged on the surface sections forms an electrically insulating insulation layer, which the surface sections of the two adjacent stator teeth delimiting the intermediate space are covered.
  • an insulating layer made of plastic is particularly simple to produce, for example by means of an injection molding process.
  • the cooling duct is expediently arranged in the region of a radially inner end section of the intermediate space. In this way, a particularly large amount of installation space is available for the arrangement of the stator winding (s) in the intermediate space. As an alternative or in addition, the arrangement of a cooling duct in the region of a radially outer end section of the intermediate space is conceivable.
  • the plastic forms at least one phase insulation which is arranged in the intermediate space and divides the intermediate space into a radially inner and into a radially outer partial space.
  • mutually electrically isolated Lei teretti of the stator winding can be arranged in the two subspaces.
  • This in turn enables the two conductor elements, which are electrically insulated from one another, to be assigned two different electrical phases, which must be electrically separated from one another. It is conceivable that in a further development of the invention several such phase isolations are also provided in an intermediate space.
  • a diameter of the phase insulation made of the plastic, measured in the radial direction, is expediently between 1 mm and 3 mm.
  • the phase insulation can expediently extend along the circumferential direction and thus connect the two insulating layers of the plastic arranged on the adjacent stator teeth.
  • the two subspaces formed are completely delimited by the, preferably electrically insulating, plastic.
  • the at least one stator winding arranged in the inter mediate space comprises at least one first conductor element and at least one second conductor element.
  • these two conductor elements are arranged at a distance from one another in the intermediate space, and preferably along the radial direction.
  • the first conductor element can be part of a first electrical phase
  • the second conductor element can be part of a second electrical phase of the stator.
  • the first conductor elements are expediently arranged in the radially inner partial space and are electrically connected to one another for connection to a common first phase of an electrical current source.
  • the second conductor elements are arranged in the radially outer subspace and are electrically connected to one another for connection to a common second phase of the electrical power source.
  • a second conductor element of the invention-essential, electrically insulating and heat-conducting plastic vice ben is preferably added to all the first and, alternatively or additionally, to all the second conductor elements.
  • the first and, alternatively or additionally, the second conductor elements can be formed as winding bars made of an electrically conductive material.
  • At least one winding bar in the cross section perpendicular to the axial direction, can have the geometry of a rectangle with two narrow sides and with two broad sides. This preferably applies to all winding bars of the stator winding.
  • the at least one first conductor element is electrically insulated from the at least one second conductor element by means of the plastic.
  • the first conductor elements are particularly preferably electrically insulated from the second conductor elements by means of the phase insulation, which separates the radially inner subspace from the radially outer subspace.
  • the plastic in the cross section perpendicular to the axial direction forms a protective coating arranged in the intermediate space, which at least partially, before or completely, delimits or envelops the cooling channel.
  • “Limitation” means in particular that the cooling duct does not require any further limitation, for example in the form of a tubular body.
  • Protective coating means in particular that an additional limitation, for example in the form of the said tubular body, can be provided for the cooling duct.
  • the protective coating can prevent the coolant, which is typically electrically conductive, that passes through the cooling channel from coming into contact with the stator winding or the electrically conductive stator teeth, which is also arranged in the intermediate space, so that an electrical short circuit occurs.
  • the protective coating in the cross section perpendicular to the axial direction limits the cooling channel radially on the inside and, alternatively or additionally, radially on the outside. In this way, an electrical insulation of the cooling duct or the coolant guided through the cooling duct is placed against the stator windings arranged radially outside or radially inside the cooling duct in the intermediate space.
  • the protective coating in FIG the cross section perpendicular to the axial direction of the cooling channel in the circumferential direction. In this way, the electrical insulation of the cooling duct or of the coolant guided through the cooling duct with respect to the electrically conductive stator teeth is ensured.
  • a further cooling duct can be arranged particularly expediently, in particular in the region of a radially outer end section of the intermediate space. In this way, the cooling of the stator windings (s) can be significantly improved.
  • the plastic forms a further protective coating arranged in the intermediate space, which at least partially, preferably completely, delimits or envelops the further cooling channel.
  • the further protective coating limits the cross section perpendicular to the axial direction of the further cooling channel radially on the inside and, alternatively or additionally, radially on the outside.
  • the further protective coating limits the further cooling channel in the circumferential direction in the cross section perpendicular to the axial direction.
  • the cooling channel arranged in the region of the radially inner end section is expediently arranged in the radially inner partial space formed by means of the phase insulation made of plastic.
  • the cooling duct arranged in the region of the ra dial outer end section is arranged in the radially outer partial space formed by means of the phase insulation made of plastic.
  • a gap is formed at least in sections between at least two conductor elements and, alternatively or additionally, between at least one conductor element and the electrical insulation layer arranged on the surface sections of the stator teeth or the stator body.
  • the plastic according to the invention forms a gap filling with which the gap is at least partially, preferably completely, filled.
  • the plastic can comprise an electrically insulating plastic compound, in which the stator winding is embedded.
  • the space in the cross section perpendicular to the axial direction can expediently have the geometry of a trapezoid, preferably a rectangle.
  • the geometry of a trapezoid or rectangle allows both at least one cooling channel and a large number of conductor elements or stator windings to be placed in the respective space.
  • the plastic provided on the surface sections of the stator teeth is replaced by an electrically insulating first tes plastic material is formed.
  • the plastic which forms the at least one phase insulation is formed by a second plastic material.
  • the first and, alternatively or additionally, the plastic forming the further protective coating can be formed by the second plastic material or, alternatively, by a third plastic material.
  • the first and, alternatively or additionally, the second and, alternatively or additionally, the third plastic material are identical materials.
  • the first and, alternatively or additionally, the second and, alternatively or additionally, the third plastic material can be different materials.
  • the first and, alternatively or additionally, the second and, alternatively or additionally, the third plastic material can expediently consist of a thermoplastic or comprise such a thermoplastic.
  • the first and, alternatively or additionally, the second and, alternatively or additionally, the third plastic material can consist of a thermoset or comprise a thermoset.
  • the first and, alternatively or additionally, the second and, alternatively or additionally, the third plastic material expediently have identical thermal conductivity.
  • the first and, alternatively or additionally, the second and, alternatively or additionally, the third plastic material can have different thermal conductivities.
  • the first and, alternatively or additionally, the second and, alternatively or additionally, the third plastic material can expediently be identical materials. Likewise, the first and, alternatively or additionally, the second and alternate tiv or additionally, the third plastic material can also be different materials.
  • the at least one stator winding is part of a distributed winding.
  • the thermal conductivity of the plastic in particular the first and, alternatively or additionally, the second and, alternatively or additionally, the third plastic material is at least 0.5 W / mK, preferably at least 1 W / m K.
  • the intermediate space is formed essentially without a gap by means of the plastic.
  • only a single cooling channel is provided in the intermediate space, that is to say no second cooling channel.
  • the machine comprises a coolant distributor space and a coolant collector space arranged axially at a distance from this.
  • the coolant distribution space communicates fluidly with the coolant collection space by means of the at least one coolant through which a coolant can flow.
  • a plurality of such cooling channels are preferably provided between the coolant distributor space and the coolant collector space.
  • the coolant distribution chamber and, alternatively or additionally, the coolant collector chamber for thermal coupling to the stator windings are at least partially arranged in the plastic essential to the invention, which in this case consists of an electrically insulating plastic material.
  • the plastic essential to the invention which in this case consists of an electrically insulating plastic material.
  • the electrically insulating plastic particularly preferably at least partially limits the coolant distribution space and, alternatively or additionally, the coolant collection space for thermal coupling to the stator windings.
  • the invention further relates to a vehicle, in particular a motor vehicle with egg ner previously presented electrical machine.
  • a vehicle in particular a motor vehicle with egg ner previously presented electrical machine.
  • the above-explained parts of the electrical machine are therefore also transferred to the vehicle according to the invention.
  • FIG. 1 shows an example of an electrical machine according to the invention in a longitudinal section along the axis of rotation of the rotor
  • FIG. 2 shows the stator of the electrical machine according to FIG. 1 in a cross section perpendicular to the axis of rotation of the rotor
  • FIG. 3 shows a detailed illustration of the stator of FIG. 2 in the region of an intermediate space between two stator teeth adjacent in the circumferential direction
  • FIG. 4 shows a further development of the example according to FIG. 3 with an additional, second cooling channel
  • FIG. 5 shows a variant of the example according to FIG. 3, in which the stator windings are formed not by winding bars but by winding wires formed in a plastic compound.
  • Figure 1 illustrates an example of an electrical machine 1 according to the invention in a sectional view.
  • the electrical machine 1 is dimensioned such that it can be used in a vehicle, preferably in a road vehicle.
  • the electrical machine 1 comprises a rotor 3 and a stator 2, which is only shown in a rough schematic in FIG. 1.
  • the stator 2 in FIG. 2 is shown in a cross section perpendicular to the axis of rotation D along the section II - II of FIG. 1 in a separate representation shown.
  • the rotor 3 has a rotor shaft 31 and can have a plurality, not shown in FIG. have shown magnets, the magnetic polarizations alternate along the circumferential direction U.
  • the rotor 3 is rotatable about an axis of rotation D, the position of which is determined by the central longitudinal axis M of the rotor shaft 31.
  • the axis of rotation D defines an axial direction A, which extends parallel to the axis of rotation D.
  • a radial direction R is perpendicular to the axial direction A.
  • a circumferential direction U rotates about the axis of rotation D.
  • the rotor 3 is arranged in the stator 2.
  • the electrical machine 1 shown here is a so-called inner runner.
  • a realization as a so-called external rotor is also conceivable, in which the rotor 3 is arranged outside the stator 2.
  • the rotor shaft 31 is mounted on the stator 2 in a first shaft bearing 32a and, axially spaced apart therefrom, in a second shaft bearing 32b about the axis of rotation D.
  • the stator 2 also includes, in a known manner, a plurality of stator windings 6 which can be electrically energized to generate a magnetic field.
  • the magnetic field generated by the magnetic interaction of the magnet 3 of the rotor 3 with the magnetic field generated by the electrically conductive stator windings 6 is the magnetic field Rotor 3 set in rotation.
  • stator 2 can have an annular stator body 7, for example made of iron.
  • stator body 7 can be formed from a plurality of stator body plates (not shown) stacked on top of one another in the axial direction A and bonded to one another.
  • a plurality of stator teeth 8 are formed radially on the inside, which extend along the axial direction A, protrude radially inward from the stator body 7 and are arranged at a distance from one another along the circumferential direction U.
  • Each stator tooth 8 carries a stator winding 6.
  • the individual stator windings 6 together form a winding arrangement.
  • the individual stator windings 6 of the entire winding arrangement can be electrically wired to one another in a suitable manner.
  • stator windings 6 When the machine 1 is in operation, the electrically energized stator windings 6 generate waste heat which has to be dissipated from the machine 1 in order to prevent overheating and associated damage or even destruction of the machine 1. Therefore, the stator windings 6 are cooled by means of a coolant K which is guided through the stator 2 and which absorbs the waste heat generated by the stator windings 6 by heat transfer.
  • the machine 1 comprises a coolant distribution space 4, in which a coolant K can be introduced via a coolant inlet 33.
  • a coolant collector chamber 5 is arranged along the axial direction A at a distance from the coolant distributor chamber 4.
  • the coolant distribution space 4 communicates fluidly with the coolant collection space 5 by means of a plurality of cooling channels 10, only one of which can be seen in the illustration in FIG. 1.
  • the coolant distribution space 4 and the coolant collection space can 5 each have an annular geometry.
  • a plurality of cooling channels 10 are arranged at a distance from one another, each of which extends along the axial direction A from the annular coolant distribution space 4 to the annular coolant collection space 5.
  • the coolant K introduced into the coolant distribution space 4 via the coolant inlet 33 can thus be distributed to the individual cooling channels 10.
  • the coolant K After flowing through the cooling channels 10 and absorbing heat from the stator windings 6, the coolant K is collected in the coolant collector space 5 and is discharged again from the machine 1 via a coolant outlet 34 provided on the stator 2.
  • the stator windings 6 and the cooling channels 10 are arranged in spaces 9, which are formed between two adjacent stator teeth 8 in the circumferential direction U. Said intermediate spaces 9 are also known to the person skilled in the art as so-called “stator slots” or “stator slots” which, like the stator teeth 8, extend along the axial direction A.
  • FIG. 3 shows an intermediate space 9 formed between two stator teeth 8 adjacent in the circumferential direction U - hereinafter also referred to as stator teeth 8a, 8b - in a detailed illustration.
  • the intermediate space 9 has an opening 52 radially on the inside, that is to say is designed to be open radially on the inside.
  • the intermediate space 9 can have the geometry of a trapezoid, in particular a rectangle, in the cross section perpendicular to the axial direction A.
  • the cooling duct 10 is arranged in the region of a radially inner end section 56a of the intermediate space 9 or the stator groove 54, that is to say in the region of the opening 52.
  • a heat-conducting plastic 11 is additionally arranged in FIG. 3 in the spaces 9 next to a cooling channel 10 and a stator winding 6. Before this plastic 11 is injected into the space 9 is introduced.
  • the plastic 11 is arranged on surface sections 50b, 50c of two stator teeth 8 which are adjacent in the circumferential direction U and which limit the space 9. Furthermore, the plastic 11 is arranged on a surface portion 50a of the stator body 7 which delimits the space 9 ra dial outside.
  • the plastic 11 arranged on the surface sections 50a, 50b, 50c is expediently an electrically insulating plastic. This ensures that both the cooling duct 10 arranged in the intermediate space 9 and the stator winding 6 arranged in the same intermediate space 9 are each electrically insulated from the stator teeth 8 by means of the plastic 11.
  • the stator winding 6 is connected via the plastic 11 in a heat-conducting manner to the cooling duct 10, so that waste heat generated in or by the stator winding 6 is transferred via the plastic 11 to the coolant K flowing through the cooling duct 10 and thus dissipated by the stator winding 6 can be.
  • the plastic 11 arranged on the three surface sections 50a, 50b, 50c forms an electrically insulating and heat-conducting insulation layer 51, which covers the surface sections 50a, 50b, 50c.
  • a layer thickness d of the insulation layer 51 can be between 0.2 mm and 0.5 mm.
  • the plastic 11 can not only form the insulation layer 51, but - alternatively or additionally - also a phase insulation 58 arranged in the intermediate space 9 or in the stator groove 54.
  • the phase insulation 58 divides the intermediate space 9 into a radially inner and an inner one a radially outer partial space 59a, 59b.
  • first conductor elements 60a of the stator winding 6, which form a first phase winding 70a can be arranged in the radially inner subspace 59a.
  • second conductor elements 60b of the stator winding 6 can be arranged in the radially outer subspace 59b, one Form second phase winding 70b, which is electrically insulated from the first phase winding 70a.
  • the phase insulation 58 expediently extends along the circumferential direction U.
  • the phase insulation 58 preferably connects the two insulation layers 51 made of the plastic 11 arranged on the adjacent stator teeth 8a, 8b.
  • the plastic 11 not only forms the electrical insulation layer 51, but also a first protective coating 75 arranged in the intermediate space 9, which delimits or surrounds the cooling duct 10.
  • a tubular body or the like for the fluid-tight limitation of the cooling channel 10 such that no coolant K can escape from it is therefore superfluous.
  • the first protective coating 75 closes the opening 52 of the open space 9 or the stator groove 54.
  • stator winding 6 is also not only electrically insulated from the cooling channel 10 via the plastic 11 forming the first protective coating 75, but also connected to it in a heat-conducting manner, so that waste heat generated in or by the stator winding 6 is also can be transferred via the first protective coating 75 to the coolant K flowing through the cooling channel 10.
  • the first conductor elements 60a are arranged in the radially inner subspace 59a and the two th conductor elements 60b in the radially outer subspace 59b.
  • the cooling duct 10 arranged in the region of the radially inner end section 54a is arranged in the radial sub-space 59a formed by means of the phase insulation 58 made of plastic 11.
  • the stator winding 6 arranged in the intermediate space 9 comprises first conductor elements 60a and second conductor elements 60b which are arranged next to one another and at a distance from one another in the intermediate space 9 along the radial direction R. Between each two adjacent conductor elements 60a, 60b along the radial direction R, a gap 61 is formed, which can preferably extend along the circumferential direction U.
  • the plastic 11 forms a gap filling 62, with which the gap 61 is completely filled.
  • a gap 61 can be formed between the first and second conductor elements 60a, 60b and the electrical insulation arranged on the surface sections 50b, 50c of the stator teeth 8a, 8b.
  • the plastic 11 forms a gap filling 62, by means of which the gap 61 is filled.
  • said gap 61 filled with the plastic 11 can also extend only in sections or can be in the form of a so-called air trap. It is also conceivable that there are several gaps 61 or air inclusions which are filled with the gap filling 62 made of plastic 11.
  • all first and second conductor elements 60a, 60b are surrounded by the electrically insulating and heat-conducting plastic 11 perpendicular to the axial direction A.
  • the first and second conductor elements 60a, 60b are each formed as first and second winding bars 65a, 65b from an electrically conductive and mechanically rigid material.
  • the first and second winding bars 65a, 65b each have the geometry of a rectangle 66 with two narrow sides 67 and two broad sides 68.
  • the first conductor elements 60a are arranged in the radially inner subspace 59a and are electrically connected to one another for connection to a common first phase of an electrical current source.
  • the two th conductor elements 60b are arranged in the radially outer partial space 59b and are electrically connected to one another for connection to a common second phase of the electrical current source.
  • first conductor elements 60a are electrically insulated from second conductor elements 60b by means of phase insulation 58.
  • FIG. 4 shows a further development of the example in FIG. 3.
  • the example in FIG. 4 differs from that in FIG. 3 in that in the region of a radially outer end section 56b of the intermediate space 9 or the stator groove 54, which corresponds to the radially inner end section 56a with respect to the radial direction, an additional cooling channel 10 is arranged.
  • the plastic 11 forms - in an analogous manner to the first protective coating 75 of the cooling duct 10 - a second protective coating 75 arranged in the intermediate space 9, which delimits and thus envelops the additional cooling duct 10.
  • the additional cooling duct 10 arranged in the radially outer end section 56b is arranged in the radially outer partial space 59b of the intermediate space 9 or the stator groove 54 formed by means of the phase insulation 58 formed by the plastic 11.
  • the second protective coating 75 can also limit the second cooling channel 10 ra dial inside and radially outside in the cross section perpendicular to the axial direction A.
  • FIG. 5 shows a variant of the example in FIG. 3.
  • the plastic forms a plastic mass in which the stator winding 6 is embedded.
  • the conductor elements 65 of the stator winding 6 are formed by winding wires 72, which are part of a distributed winding.
  • the plastic 11 provided on the surface sections 50a, 50b, 50c of the stator teeth 8a, 8b can be formed by a, preferably electrically insulating, first plastic material K1.
  • the plastic 11 forming the phase insulation 58 can be formed by a second plastic material K2.
  • the plastic 11 forming the first and second protective coating 75 can be formed by the second plastic material K2 or by a different third plastic material K3.
  • the second plastic material K2 is expediently designed to be electrically insulating or electrically conductive.
  • the third plastic material K3 can also be either electrically insulating or electrically conductive.
  • the first plastic material K1 can be a thermoplastic or a thermoset. The same applies to the second and third plastic material K2, K3.
  • Two or even all three plastic materials K1, K2, K3 can have identical thermal conductivities.
  • the first and, alternatively or additionally, the second and, alternatively or additionally, the third plastic material K1, K2, K3 have different thermal conductivities.
  • the first and, alternatively or additionally, the second and, alternatively or additionally, the third plastic material K1, K2, K3 can be identical materials.
  • the first and, alternatively or additionally, the second and, alternatively or additionally, the third plastic material K1, K2, K3 can be different materials.
  • the thermal conductivity of the plastic 11 in particular special of the first and, alternatively or additionally, the second and, alternatively or additionally, the third plastic material K1, K2, K3, at least 0.5 W / mK, preferably at least 1 W / m K.
  • stator 2 with the stator body 7 and the stator teeth 8 is arranged axially between a first and a second end shield 25a, 25b.
  • part of the coolant distribution space 4 is arranged in the first bearing plate 25a and part of the coolant collecting space 5 in the second bearing plate 25b.
  • the coolant distribution space 4 and the coolant collecting space 5 are thus each partially formed by a provided in the plastic 11 cavity 41 a, 41 b.
  • the first cavity 41a is supplemented by a cavity 42a formed in the first end shield 25a for the coolant distributor space 4.
  • the second cavity 41b is supplemented by a cavity 42b formed in the second end shield 25b for the coolant collector space 5.
  • the plastic 11 thus delimits the coolant distribution space 4 and the coolant collection space 5 at least partially.
  • a coolant supply 35 can also be formed, which fluidically connects the coolant distributor space 4 with an outside, in particular as shown in FIG. 1, circumferentially on the first bearing plate 25a provided coolant inlet 33.
  • a coolant outlet 36 can be formed in the second end plate 25b, which fluidically connects the coolant collecting chamber 5 to an outside, in particular, as shown in FIG. 1, around the start side of the coolant outlet 34 provided on the end plate 25b.
  • the plastic 11 can also be arranged on an outer peripheral side 30 of the stator body 7 and thus form a plastic coating 11.1 on the outer peripheral side 30.
  • the stator body 7 of the stator 2 which is typically formed from electrically conductive stator plates, can thus be electrically insulated from the surroundings. The provision of a separate housing for receiving the stator body 7 can thus be omitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Windings For Motors And Generators (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Abstract

L'invention concerne une machine électrique (1), en particulier destinée à un véhicule. Cette machine comprend un rotor (3) qui peut être mis en rotation autour d'un axe de rotation (D) qui définit une direction axiale (A) de la machine électrique (1), ainsi qu'un stator (2) qui présente des enroulements statoriques (6) électriquement conducteurs. La machine (1) comprend en outre au moins un canal de refroidissement (10), de préférence plusieurs canaux de refroidissement (10) à travers lesquels peut circuler un agent de refroidissement (K) pour refroidir les enroulements statoriques (6). Le stator (2) présente des dents statoriques (8) qui s'étendent le long de la direction axiale (A) et sont agencées à distance les unes des autres le long d'une direction circonférentielle (U) du rotor (3), ces dents portant les enroulements statoriques (6). Par ailleurs, au moins un canal de refroidissement (10) et au moins un enroulement statorique (6) sont agencés dans au moins un interstice (9) ménagé entre deux dents statoriques (8, 8a, 8b) voisines dans la direction circonférentielle (U). Selon l'invention, une matière plastique (11) est disposée dans l'interstice (9) pour assurer un transfert de chaleur de l'enroulement statorique (6) au canal de refroidissement (10).
EP19805268.0A 2018-11-19 2019-11-15 Machine électrique, en particulier pour véhicule Pending EP3884567A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018219816.0A DE102018219816A1 (de) 2018-11-19 2018-11-19 Elektrische Maschine, insbesondere für ein Fahrzeug
PCT/EP2019/081478 WO2020104322A1 (fr) 2018-11-19 2019-11-15 Machine électrique, en particulier pour véhicule

Publications (1)

Publication Number Publication Date
EP3884567A1 true EP3884567A1 (fr) 2021-09-29

Family

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Application Number Title Priority Date Filing Date
EP19805268.0A Pending EP3884567A1 (fr) 2018-11-19 2019-11-15 Machine électrique, en particulier pour véhicule

Country Status (6)

Country Link
US (1) US20220014062A1 (fr)
EP (1) EP3884567A1 (fr)
JP (1) JP2022507430A (fr)
CN (1) CN113039705A (fr)
DE (1) DE102018219816A1 (fr)
WO (1) WO2020104322A1 (fr)

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DE102021113691A1 (de) * 2021-05-27 2022-12-01 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Stator einer elektrischen Antriebsmaschine und Verfahren zum Herstellen desselben
DE102021115932A1 (de) * 2021-06-21 2022-12-22 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Stator einer elektrischen Maschine und elektrische Maschine
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WO2024046562A1 (fr) 2022-08-31 2024-03-07 Gkn Automotive Limited Stator de machine électrique avec canaux de refroidissement internes

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Also Published As

Publication number Publication date
WO2020104322A1 (fr) 2020-05-28
JP2022507430A (ja) 2022-01-18
US20220014062A1 (en) 2022-01-13
CN113039705A (zh) 2021-06-25
DE102018219816A1 (de) 2020-05-20

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