WO2021074776A1 - Cooling component for electric motor - Google Patents

Cooling component for electric motor Download PDF

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Publication number
WO2021074776A1
WO2021074776A1 PCT/IB2020/059585 IB2020059585W WO2021074776A1 WO 2021074776 A1 WO2021074776 A1 WO 2021074776A1 IB 2020059585 W IB2020059585 W IB 2020059585W WO 2021074776 A1 WO2021074776 A1 WO 2021074776A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
ring
segments
dissipating elements
outer ring
Prior art date
Application number
PCT/IB2020/059585
Other languages
French (fr)
Inventor
Bruno Vianello
Original Assignee
Texa Dynamics S.R.L.
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 Texa Dynamics S.R.L. filed Critical Texa Dynamics S.R.L.
Publication of WO2021074776A1 publication Critical patent/WO2021074776A1/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
    • H02K3/04—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
    • H02K9/00—Arrangements for cooling or ventilating

Definitions

  • the invention refers - in general - to a cooling component for an electric motor, in particular a stator, e.g. mounted on electric vehicles.
  • the component can advantageously be applied especially to high-power electric motors for vehicles, here taken as an example.
  • High-power vehicles have electric motors with rated powers of hundreds of KW, hence the primary need to cool them.
  • the Applicant has made a stator of an electric motor capable of cooling the windings mounted in it, comprising an outer ring, an inner ring concentric to the outer ring, segments that extend radially from the inner ring to the outer ring, wherein the rings and segments are hollow inside and join to form a continuous channel inside them capable of carrying a cooling fluid along a path that passes from one ring to the other.
  • the rings and segments are arranged to form or delimit pass-through openings capable of accommodating and surrounding the windings.
  • stator For optimum performance the stator must be able to be cooled very accurately.
  • the main object of the invention is to improve this state of the art.
  • a component for an electric motor is proposed, in particular a stator, configured to cool windings mounted in it, wherein e.g. the motor is mounted on an electric vehicle, the component or stator comprising: an outer ring, an inner ring concentric to the outer ring, segments extending radially from the inner ring to the outer ring, wherein the rings and segments are internally hollow (they have an internal cavity) and join to form a continuous channel inside them capable of carrying a cooling fluid along a path that passes from one ring to the other, the rings and segments being arranged to form or delimit pass-through openings capable of accommodating and surrounding the windings, wherein the internal cavity of one or each ring is delimited by two opposite (e.g. curved) surfaces radially separated by an empty space, on one or each of such two surfaces there being heat dissipating elements that extend cantilevered into the cavity from the surface to the opposite surface.
  • the internal cavity of one or each ring is delimited by two opposite (e.g. curved) surfaces
  • the component or stator is better able to dissipate the heat taken from the windings towards the cooling liquid circulating in the ring cavities.
  • the above mentioned dissipating elements being a structure equivalent to a finning, allow increasing the area lapped by the fluid circulating around the windings and inside the cavities of the rings, thus increasing the heat removal.
  • the stator is preferably hermetically housed inside a containment box.
  • the containment box has - substantially - a cylindrical-shell shape, for fitting with the stator, and even more particularly the containment box is equipped with an inlet and an outlet for said cooling fluid.
  • Said dissipating elements may be present on the inner ring and/or on the outer ring. If present in a ring, said dissipating elements may be present on one or both of their opposite surfaces. In practice, however, it is yet more important that the dissipating elements are integrated in the outer ring, because this ring is in contact with or near the containment box, from which the heat is dissipated towards the external environment and/or through the removal/circulation of the heated fluid.
  • the dissipating elements may be made on the surface of the outer ring closest to the center of the stator or on the surface of the outer ring furthest from the center of the stator, i.e. the one closest to - or in contact with - the containment box. In the first case the dissipating elements increase the dissipating surface for the heat taken from the windings, in the second case the dissipating elements increase the receiving surface for the heat taken from the liquid circulating towards the containment box.
  • the dissipating elements are cone-shaped elements, or truncated cone-shaped elements or cylinder-shaped elements or pyramid shaped elements or prism-shaped elements, which project from one of said surfaces.
  • Other embodiments may comprise: fins, walls, or perforated grids into which the fluid can enter and then exit.
  • the dissipating elements form a comb structure on said one or more opposite surfaces.
  • the dissipating elements are arranged in arrays, preferably aligned on one or more rows.
  • the dissipating elements are arranged in one or more rows that run circumferentially, around the center of the stator, on one of said surfaces. Even if the dissipating elements can be in a row that occupies only one arc of circumference on one or each ring, preferably said one or more rows occupy entirely a circumference on one of said opposite surfaces. In the case of several circumferences of dissipating elements, it is preferred that such circumferences are contained in planes parallel to each other, for reasons of symmetry.
  • the outer ring and inner ring describe a circumference.
  • the segments are linear segments.
  • the outer ring and the inner ring lie substantially on a plane and are substantially coplanar.
  • the outer ring, inner ring and segments are hollow shells.
  • the continuous channel forms a path that makes a complete turn around the center of the rings, so that heat is drawn extensively from the windings.
  • the segments preferably extend radially along an axis passing through the center of the rings, and in particular with polar symmetry with respect to such center.
  • the segments form for the rings a sort of hub-and-spoke structure which advantageously laps the sides of the windings from which it removes heat.
  • stator there is more than one continuous channel inside the stator, particularly two.
  • Multiple channels allow for faster heat dissipation and balanced dissipation, e.g. preventing the fluid at the end of a channel from being too hot to remove heat effectively.
  • stator thus combinable is a uniform solid, e.g. for ease of assembly.
  • a preferred structure for the hollow segments of each of said two or more superimposed and insulated parts is that the segments form a partition of an overall segment having a thickness equal to that of all the superimposed rings.
  • said pass-through openings have a contour complementary to the perimeter of the windings they surround.
  • the surface of the inner edge of the outer ring and the surface of the outer edge of the inner ring comprise cusps with the tips directed radially and facing the cusps of the opposite edge.
  • Another aspect of the invention concerns an electric motor equipped with the stator or component as defined above in one or each of the variants.
  • the invention is preferably directed to the making of a stator for an axial- flux electric motor, that is a motor having a stator with a circular series of windings, arranged around the rotation axis of a rotor, which generate a magnetic flux with polar axis parallel to the rotation axis of the rotor.
  • This type of motor has a more complex structure than radial flux motors but is lighter and smaller the power being the same.
  • an axial-flow electric motor comprising: a rotor rotatable about a rotation axis and equipped with a circular series of magnetic elements (e.g. permanent magnets), a stator comprising a circular series of seats to house a circular series of windings, each capable of creating a magnetic field with the polar axis parallel to the rotation axis, wherein each winding is configured to create a magnetic field through which to rotate the rotor thanks to the magnetic interaction between the generated magnetic fields and the circular series of magnetic elements of the rotor, wherein the stator is made as one or each variant defined here.
  • a rotor rotatable about a rotation axis and equipped with a circular series of magnetic elements (e.g. permanent magnets)
  • a stator comprising a circular series of seats to house a circular series of windings, each capable of creating a magnetic field with the polar axis parallel to the rotation axis, wherein each winding is configured to create a magnetic field through which to rotate the
  • Another aspect of the invention concerns an electric vehicle equipped with the motor as defined above in one or each of the variants.
  • Fig. 1 shows a side view of a stator
  • Fig. 2 shows a side view in vertical cross-section of the stator
  • Fig. 3 shows a cross-sectional view of the stator according to plane Ill-Ill.
  • Fig. 1 shows a stator 10 of an electric motor, consisting of an outer circular ring 30, an inner circular ring 40 concentric to the outer ring 30, and straight segments or spokes 50 radially joining the two rings 30, 40.
  • the outer ring 30 and the inner ring 40 have center on the rotation axis X of a rotor (not shown).
  • the number of segments or spokes 50 may vary, thus varying the number of windings.
  • the rings 30, 40 and the segments 50 are preferably hollow shells and together they form a continuous channel to carry a cooling fluid, which enters the stator 10 through an inlet and exits from an outlet.
  • the fluid circulation inside the stator 10 occurs along a path that involves at least once the two rings 30, 40 and at least two segments 50.
  • the fluid circulates inside the stator 20 passing from the ring 30 to the ring 40 through a segment 50 and then passing from the ring 40 to the ring 30 through a different segment 50.
  • the fluid laps the windings and subtracts heat from them.
  • the number of channels for the cooling fluid inside the component may vary, in particular the number of independent channels. Two or more separate channels can better remove heat from the windings, providing a more uniform operating temperature to the motor.
  • the stator 10 is contained inside an external casing 90, useful e.g. for fixing the motor to a vehicle and/or for defining a common inlet and outlet for the common cooling fluid.
  • each ring 30, 40 is delimited - respectively - by two opposite curved surfaces 30a, 30b and 40a, 40b radially separated by an empty space or cavities 30c, 40c, see fig. 2 and 3.
  • dissipating elements 70 extending cantilevered into the cavity 30c from the surface 30a, 30b towards the opposite surface 30b, 30a, respectively.
  • the illustrated example shows only dissipating elements 70 inside the outer ring 30, but also or only the other ring 40 may be equipped with them.
  • the dissipating elements 70 serve to increase the heat exchange surface between the ring 30 and the fluid circulating inside the cavity 30c.
  • the heat is dissipated through the removal/circulation of heated fluid, but also towards the outside environment through the case 90.
  • the elements 70 placed on the outermost surface 30b also increase it but also towards the external environment through heat exchange with the case 90.
  • the dissipating elements 70 may be made on the surface 30a or 30b, or both. Preferably, for simplicity of construction, the dissipating elements 70 are shaped as a cone or cylinder or pyramid or prism (fig. 3).
  • the dissipating elements 70 are arranged in arrays, aligned on one or more rows, in the example three.
  • the dissipating elements 70 are arranged in rows on various circumferences that run inside the cavity 30c on each of said opposite surfaces 30a, 30b, see magnification of fig. 3.
  • dissipating elements 70 form a labyrinth inside the 30c cavity for the circulating cooling fluid.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

A component of electric motor is described configured to cool windings mounted therein. The component is formed by an outer ring (30), an inner ring (40) concentric to the outer ring, and segments (50) extending radially from the inner ring to the outer ring. An internal cavity (30c, 40c) of one or each ring is delimited by two opposite surfaces (30a, 30b; 40a, 40b) radially separated by an empty space, and on one or each of said surfaces there are heat dissipating elements (70) which extend cantilevered inside the cavity from the surface to the opposite surface.

Description

Cooling component for electric motor
The invention refers - in general - to a cooling component for an electric motor, in particular a stator, e.g. mounted on electric vehicles. The component can advantageously be applied especially to high-power electric motors for vehicles, here taken as an example.
High-power vehicles have electric motors with rated powers of hundreds of KW, hence the primary need to cool them.
The Applicant has made a stator of an electric motor capable of cooling the windings mounted in it, comprising an outer ring, an inner ring concentric to the outer ring, segments that extend radially from the inner ring to the outer ring, wherein the rings and segments are hollow inside and join to form a continuous channel inside them capable of carrying a cooling fluid along a path that passes from one ring to the other. The rings and segments are arranged to form or delimit pass-through openings capable of accommodating and surrounding the windings.
For optimum performance the stator must be able to be cooled very accurately.
The main object of the invention is to improve this state of the art.
This object is achieved with a stator and/or component as defined hereinafter or in the attached claims, wherein the dependent ones define advantageous variants.
A component for an electric motor is proposed, in particular a stator, configured to cool windings mounted in it, wherein e.g. the motor is mounted on an electric vehicle, the component or stator comprising: an outer ring, an inner ring concentric to the outer ring, segments extending radially from the inner ring to the outer ring, wherein the rings and segments are internally hollow (they have an internal cavity) and join to form a continuous channel inside them capable of carrying a cooling fluid along a path that passes from one ring to the other, the rings and segments being arranged to form or delimit pass-through openings capable of accommodating and surrounding the windings, wherein the internal cavity of one or each ring is delimited by two opposite (e.g. curved) surfaces radially separated by an empty space, on one or each of such two surfaces there being heat dissipating elements that extend cantilevered into the cavity from the surface to the opposite surface.
With this structure the component or stator is better able to dissipate the heat taken from the windings towards the cooling liquid circulating in the ring cavities. In other words, the above mentioned dissipating elements, being a structure equivalent to a finning, allow increasing the area lapped by the fluid circulating around the windings and inside the cavities of the rings, thus increasing the heat removal. The stator is preferably hermetically housed inside a containment box. In particular, the containment box has - substantially - a cylindrical-shell shape, for fitting with the stator, and even more particularly the containment box is equipped with an inlet and an outlet for said cooling fluid.
Said dissipating elements may be present on the inner ring and/or on the outer ring. If present in a ring, said dissipating elements may be present on one or both of their opposite surfaces. In practice, however, it is yet more important that the dissipating elements are integrated in the outer ring, because this ring is in contact with or near the containment box, from which the heat is dissipated towards the external environment and/or through the removal/circulation of the heated fluid. The dissipating elements may be made on the surface of the outer ring closest to the center of the stator or on the surface of the outer ring furthest from the center of the stator, i.e. the one closest to - or in contact with - the containment box. In the first case the dissipating elements increase the dissipating surface for the heat taken from the windings, in the second case the dissipating elements increase the receiving surface for the heat taken from the liquid circulating towards the containment box.
Preferably, for simplicity of construction, the dissipating elements are cone-shaped elements, or truncated cone-shaped elements or cylinder-shaped elements or pyramid shaped elements or prism-shaped elements, which project from one of said surfaces. Other embodiments may comprise: fins, walls, or perforated grids into which the fluid can enter and then exit. Preferably, for simplicity of construction, the dissipating elements form a comb structure on said one or more opposite surfaces.
Preferably, for simplicity of construction, the dissipating elements are arranged in arrays, preferably aligned on one or more rows. In particular, the dissipating elements are arranged in one or more rows that run circumferentially, around the center of the stator, on one of said surfaces. Even if the dissipating elements can be in a row that occupies only one arc of circumference on one or each ring, preferably said one or more rows occupy entirely a circumference on one of said opposite surfaces. In the case of several circumferences of dissipating elements, it is preferred that such circumferences are contained in planes parallel to each other, for reasons of symmetry. Preferably, for simplicity of construction, the outer ring and inner ring describe a circumference.
Preferably, for simplicity of construction, the segments are linear segments.
Preferably, for simplicity of construction, the outer ring and the inner ring lie substantially on a plane and are substantially coplanar.
The outer ring, inner ring and segments are hollow shells.
Preferably the continuous channel forms a path that makes a complete turn around the center of the rings, so that heat is drawn extensively from the windings.
The segments preferably extend radially along an axis passing through the center of the rings, and in particular with polar symmetry with respect to such center. As a result, the segments form for the rings a sort of hub-and-spoke structure which advantageously laps the sides of the windings from which it removes heat.
Preferably there is more than one continuous channel inside the stator, particularly two. Multiple channels allow for faster heat dissipation and balanced dissipation, e.g. preventing the fluid at the end of a channel from being too hot to remove heat effectively.
It is convenient that the stator thus combinable is a uniform solid, e.g. for ease of assembly.
A preferred structure for the hollow segments of each of said two or more superimposed and insulated parts is that the segments form a partition of an overall segment having a thickness equal to that of all the superimposed rings.
Preferably, in order to maximize heat dissipation, said pass-through openings have a contour complementary to the perimeter of the windings they surround. In particular, the surface of the inner edge of the outer ring and the surface of the outer edge of the inner ring comprise cusps with the tips directed radially and facing the cusps of the opposite edge. Another aspect of the invention concerns an electric motor equipped with the stator or component as defined above in one or each of the variants.
In particular, the invention is preferably directed to the making of a stator for an axial- flux electric motor, that is a motor having a stator with a circular series of windings, arranged around the rotation axis of a rotor, which generate a magnetic flux with polar axis parallel to the rotation axis of the rotor. This type of motor has a more complex structure than radial flux motors but is lighter and smaller the power being the same.
It is proposed then in particular an axial-flow electric motor comprising: a rotor rotatable about a rotation axis and equipped with a circular series of magnetic elements (e.g. permanent magnets), a stator comprising a circular series of seats to house a circular series of windings, each capable of creating a magnetic field with the polar axis parallel to the rotation axis, wherein each winding is configured to create a magnetic field through which to rotate the rotor thanks to the magnetic interaction between the generated magnetic fields and the circular series of magnetic elements of the rotor, wherein the stator is made as one or each variant defined here.
Another aspect of the invention concerns an electric vehicle equipped with the motor as defined above in one or each of the variants.
The advantages of the invention will be clearer from the following description of a preferred embodiment of stator, referring to the attached drawing in which
• Fig. 1 shows a side view of a stator,
• Fig. 2 shows a side view in vertical cross-section of the stator,
• Fig. 3 shows a cross-sectional view of the stator according to plane Ill-Ill.
In order not to crowd the drawings, not all equal and repeated parts are indicated by numbers.
Fig. 1 shows a stator 10 of an electric motor, consisting of an outer circular ring 30, an inner circular ring 40 concentric to the outer ring 30, and straight segments or spokes 50 radially joining the two rings 30, 40. The outer ring 30 and the inner ring 40 have center on the rotation axis X of a rotor (not shown). Two adjacent segments 50 and the arcs of ring 30, 40 included by them delimit pass through cavities 36 having perimeter complementary to windings mounted in the stator 10.
The number of segments or spokes 50 may vary, thus varying the number of windings.
The rings 30, 40 and the segments 50 are preferably hollow shells and together they form a continuous channel to carry a cooling fluid, which enters the stator 10 through an inlet and exits from an outlet.
The fluid circulation inside the stator 10 occurs along a path that involves at least once the two rings 30, 40 and at least two segments 50. In other words, the fluid circulates inside the stator 20 passing from the ring 30 to the ring 40 through a segment 50 and then passing from the ring 40 to the ring 30 through a different segment 50. During the flow, the fluid laps the windings and subtracts heat from them.
The number of channels for the cooling fluid inside the component may vary, in particular the number of independent channels. Two or more separate channels can better remove heat from the windings, providing a more uniform operating temperature to the motor.
The stator 10 is contained inside an external casing 90, useful e.g. for fixing the motor to a vehicle and/or for defining a common inlet and outlet for the common cooling fluid.
The inner cavity 30c, 40c of each ring 30, 40 is delimited - respectively - by two opposite curved surfaces 30a, 30b and 40a, 40b radially separated by an empty space or cavities 30c, 40c, see fig. 2 and 3. On the surfaces 30a, 30b there are dissipating elements 70 extending cantilevered into the cavity 30c from the surface 30a, 30b towards the opposite surface 30b, 30a, respectively.
The illustrated example shows only dissipating elements 70 inside the outer ring 30, but also or only the other ring 40 may be equipped with them.
The dissipating elements 70 serve to increase the heat exchange surface between the ring 30 and the fluid circulating inside the cavity 30c. The heat is dissipated through the removal/circulation of heated fluid, but also towards the outside environment through the case 90. The elements 70 placed on the outermost surface 30b also increase it but also towards the external environment through heat exchange with the case 90.
The dissipating elements 70 may be made on the surface 30a or 30b, or both. Preferably, for simplicity of construction, the dissipating elements 70 are shaped as a cone or cylinder or pyramid or prism (fig. 3).
As it can be seen from the example, the dissipating elements 70 are arranged in arrays, aligned on one or more rows, in the example three. In particular, the dissipating elements 70 are arranged in rows on various circumferences that run inside the cavity 30c on each of said opposite surfaces 30a, 30b, see magnification of fig. 3.
Notice how the dissipating elements 70 form a labyrinth inside the 30c cavity for the circulating cooling fluid.

Claims

1. Stator (10) of electric motor configured to cool windings mounted therein, the stator comprising: an outer ring (30), an inner ring (40) concentric to the outer ring, and segments (50) extending radially from the inner ring to the outer ring, wherein the rings and the segments are internally hollow and are joined to form a continuous channel (30c) inside them capable of transporting a cooling fluid along a path that passes from one ring to the other, the rings and the segments being arranged to form or delimit pass-through openings (36) able to accommodate and surround the windings, wherein the internal cavity (30c, 40c) of one or each ring is delimited by two opposite surfaces (30a, 30b; 40a, 40b) radially separated by an empty space, on one or each of said surfaces being present heat dissipating elements (70) which extend cantilevered inside the cavity from the surface to the opposite surface.
2. Stator (10) according to claim 1 , wherein the dissipating elements (70) have the shape of a cone, or truncated cone or cylinder or pyramid or truncated pyramid or prism, which project from one of said surfaces.
3. Stator (10) according to claim 1 or 2, wherein the dissipating elements (70) have the shape of a fin, a wall, or a perforated grid.
4. Stator (10) according to any previous claim, wherein the dissipating elements (70) are arranged in arrays, preferably aligned on one or more rows.
5. Stator (10) according to any previous claim, wherein the dissipating elements (70) are arranged in one or more rows which run circumferentially, around the center of the stator, on one of said surfaces.
6. Stator (10) according to the previous claim, wherein the dissipating elements (70) occupy an entire circumference on one of said opposite surfaces.
7. Stator (10) according to any previous claim, wherein the outer ring and the inner ring describe a circumference, and the segments are linear segments.
8. Stator (10) according to any previous claim, belonging to an axial-flow electric motor, the stator comprising a circular series of windings, arranged around the rotation axis of a rotor, to generate a magnetic flux with a polar axis parallel to the rotation axis (X) of the rotor, the rotor being equipped with permanent magnets to interact with the generated magnetic field.
PCT/IB2020/059585 2019-10-15 2020-10-13 Cooling component for electric motor WO2021074776A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102019000018776 2019-10-15
IT102019000018776A IT201900018776A1 (en) 2019-10-15 2019-10-15 "Cooling component for electric motor"

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WO2021074776A1 true WO2021074776A1 (en) 2021-04-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022119278A1 (en) 2022-07-05 2024-01-11 GM Global Technology Operations LLC Thermal connection system for a stator core of an axial flux electric motor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2498386A1 (en) * 2011-03-10 2012-09-12 Wilic S.Ar.L "Wind turbine rotary electric machine"
CN106602784A (en) * 2017-01-17 2017-04-26 佛山市南海区天洋电机制造有限公司 High-speed motor structure
GB2546255A (en) * 2016-01-07 2017-07-19 Mclaren Automotive Ltd Cooling electric machines
WO2019171318A1 (en) * 2018-03-08 2019-09-12 Texa Dynamics S.R.L. Cooling component for electric motor
WO2019180308A1 (en) * 2018-03-20 2019-09-26 Lappeenrannan-Lahden Teknillinen Yliopisto Lut A stator of an electric machine and an electric machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2498386A1 (en) * 2011-03-10 2012-09-12 Wilic S.Ar.L "Wind turbine rotary electric machine"
GB2546255A (en) * 2016-01-07 2017-07-19 Mclaren Automotive Ltd Cooling electric machines
CN106602784A (en) * 2017-01-17 2017-04-26 佛山市南海区天洋电机制造有限公司 High-speed motor structure
WO2019171318A1 (en) * 2018-03-08 2019-09-12 Texa Dynamics S.R.L. Cooling component for electric motor
WO2019180308A1 (en) * 2018-03-20 2019-09-26 Lappeenrannan-Lahden Teknillinen Yliopisto Lut A stator of an electric machine and an electric machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022119278A1 (en) 2022-07-05 2024-01-11 GM Global Technology Operations LLC Thermal connection system for a stator core of an axial flux electric motor

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