Electric motor assembly with tray

Abstract

An electric motor assembly includes a rotor and a stator disposed radially outward of the rotor. The stator includes a stator core and a plurality of windings. The stator core extends axially in a first direction from a first axial end to a second axial end opposite the first axial end. A plurality of windings extend along the stator core. Each of the plurality of windings respectively includes a terminal end positioned axially outside a second axial end of the stator core in a first axial direction. At least one winding of the plurality of windings is fixed to the bus bar proximate to a terminal end of the at least one winding. The tray is coupled to the bus bar and supports the bus bar. The tray defines at least one receiving portion through which the at least one winding extends.

Description

[0001] Cross-reference to related applications This application claims priority to U.S. Provisional Application No. 63 / 537,939, filed September 12, 2023, and U.S. Non-Provisional Application No. 18 / 654,244, filed May 3, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure generally relates to electric motor assemblies. More specifically, this disclosure relates to an electric motor assembly comprising a tray for supporting a busbar; and a plurality of holes for receiving corresponding plurality of windings passing through the holes. Background Technology

[0003] Electric motors typically consist of windings fixed to a busbar. During operation of these electric motors, forces can be applied to the windings, causing stress at the connection points between the windings and the busbar. Summary of the Invention

[0004] According to a first aspect of this disclosure, an electric motor assembly includes a rotor and a stator radially disposed outside the rotor. The stator includes a stator core and a plurality of windings. The stator core extends axially from a first axial end in a first direction to a second axial end opposite to the first axial end. The plurality of windings extend along the stator core. Each of the plurality of windings includes a terminal end that is axially positioned outside the second axial end of the stator core in the first axial direction. At least one of the plurality of windings is fixed to a busbar proximate to the terminal end of the at least one winding. A tray is coupled to and supports the busbar. The tray defines at least one receiving portion through which at least one winding extends.

[0005] Embodiments of the first aspect of this disclosure may include any one or a combination of the following features: - At least one receiving part is axially positioned between the busbar and the stator core; - At least one receiving portion extends from a first opening to a second opening that is axially offset from the first opening, and the portion of the tray defining at least one receiving portion tapers inward as the portion extends axially in the first axial direction, such that the first opening is larger than the second opening. - The tray is configured to remain in contact with at least one winding at a second opening in at least one receiving portion; - At least one receiving part includes at least one hole; - At least one winding extending through at least one receiving portion defined by the tray is fixed to at least one of the radially outward-facing surface of the busbar and the radially inward-facing surface of the busbar; - At least one winding extending through at least one receiving portion defined by the tray is fixed to the radially outward-facing surface of the busbar; - At least one winding extending through at least one receiving portion defined by the tray is fixed to the radially inward-facing surface of the busbar; - At least one receiving portion includes at least one inner receiving portion defined by a tray and at least one outer receiving portion defined by the tray and radially positioned outside the at least one inner receiving portion; - At least one winding includes at least one inner winding and at least one outer winding, the at least one inner winding extending through at least one inner receiving portion defined by the tray and fixed to a radially inward-facing surface of the busbar, and at least one outer winding extending through at least one outer receiving portion defined by the tray and fixed to a radially outward-facing surface of the busbar. - At least one inner receiving portion includes a plurality of inner receiving portions, at least one outer receiving portion includes a plurality of outer receiving portions, at least one inner winding includes a plurality of inner windings that extend through the corresponding plurality of inner receiving portions, and at least one outer winding includes a plurality of outer windings that extend through the corresponding plurality of outer receiving portions. - The tray includes: a body that supports a busbar; an inner guide member that extends radially inward from the body and defines a plurality of inner receiving portions; and an outer guide member that extends radially outward from the body and defines a plurality of outer receiving portions. - At a given circumferential position occupied by the inner guide member, the innermost radial portion of the inner guide member is the innermost radial portion of the tray at the given circumferential position occupied by the inner guide member; and - At a given circumferential position occupied by the outer guide member, the outermost radial portion of the outer guide member is the outermost radial portion of the tray at the given circumferential position occupied by the outer guide member.

[0006] According to a second aspect of this disclosure, a tray for an electric motor assembly includes a support structure configured to support at least one busbar of the electric motor assembly and defining a plurality of holes configured to receive corresponding plurality of windings passing through the plurality of holes, the plurality of windings being configured to be fixed to at least one busbar.

[0007] Embodiments of the second aspect of this disclosure may include any one or a combination of the following features: - At least one of the plurality of holes extends from a first opening to a second opening, wherein the first opening is larger than the second opening; - The plurality of holes includes a plurality of inner holes and a plurality of outer holes, the plurality of outer holes being radially positioned outside the plurality of inner holes, and wherein the support structure includes: a body configured to support at least one busbar; an inner guide member extending radially inward from the body and defining the plurality of inner holes; and an outer guide member extending radially outward from the body and defining the plurality of outer holes; - At a given circumferential position occupied by the inner guide member, the innermost radial portion of the inner guide member is the innermost radial portion of the tray at the given circumferential position occupied by the inner guide member; and - At a given circumferential position occupied by the outer guide member, the outermost radial portion of the outer guide member is the outermost radial portion of the tray at the given circumferential position occupied by the outer guide member.

[0008] According to a third aspect of this disclosure, an electric motor assembly includes: a stator including a stator core and a plurality of windings extending along the stator core; a busbar to which the plurality of windings are fixed; and a tray coupled to and supporting the busbar and defining a plurality of holes through which the plurality of windings extend respectively.

[0009] Those skilled in the art will further understand and recognize these features, advantages, and objectives of this disclosure, as well as other features, advantages, and objectives, by referring to the appended specification, claims, and accompanying drawings. Attached Figure Description

[0010] In the attached diagram: Figure 1 This is a cross-sectional view of an electric drive unit, which includes an electric motor assembly having a stator and a rotor. Figure 2 This is a perspective view of a portion of an electric motor assembly according to one embodiment, illustrating: a stator including a stator core and a plurality of windings; a plurality of busbars to which the plurality of windings are fixed; and a tray supporting the plurality of busbars and defining a plurality of holes through which the plurality of windings extend. Figure 3 According to one implementation method Figure 2 A magnified view of the area containing the electric motor assembly; Figure 4 This is a partial side view of an electric motor assembly according to one embodiment, illustrating a busbar and a plurality of windings fixed to a radially inward-facing surface and a radially outward-facing surface of the busbar. Figure 5 This is a perspective view of a portion of an electric motor assembly according to one embodiment, illustrating multiple busbars and multiple windings fixed to the busbars. Figure 6 This is a perspective view of the tray of an electric motor assembly according to one embodiment; Figure 7 This is a side view of the tray of an electric motor assembly according to one embodiment; and Figure 8 yes Figure 6 A cross-sectional view of a portion of the tray taken at line VIII-VIII, illustrating a receiving portion defined by the tray, the receiving portion including a first opening larger than a second opening.

[0011] The components in the accompanying drawings are not necessarily drawn to scale; rather, the focus is on illustrating the principles described in this article. Detailed Implementation

[0012] Additional features and advantages of this disclosure will be set forth in the following detailed description and will become apparent to those skilled in the art from the description, or will be recognized by practice of this disclosure as described in the following description, the claims, and the accompanying drawings.

[0013] As used herein, the term “and / or” when used in a list of two or more items means that any one of the listed items may be used alone or any combination of two or more of the listed items may be used. For example, if a composition is described as containing components A, B, and / or C, the composition may contain: A alone; B alone; C alone; a combination of A and B; a combination of A and C; a combination of B and C; or a combination of A, B, and C.

[0014] In this document, relational terms such as “first” and “second”, “top” and “bottom” are used only to distinguish one entity or action from another, and do not necessarily require or imply any actual such relationship or order between these entities or actions.

[0015] For the purposes of this disclosure, the term "connection" (in all its forms: connected, linked, coupled, etc.) generally means a direct or indirect link between two components (electrical or mechanical). Such a connection may be inherently static or inherently movable. Such a connection may be achieved using two components (electrical or mechanical) and / or any additional intermediate member. Such a connection may include integrating the components into a single unit (i.e., integrally connected) or may refer to the connection of two components. Unless otherwise stated, such a connection may be inherently permanent, or inherently removable or detachable.

[0016] As used herein, the terms “substantial,” “substantially,” and their variations are intended to indicate that the described feature is equal to or approximately equal to a certain value or description. For example, a “substantially planar” surface is intended to indicate a planar or approximately planar surface. Furthermore, “substantially” is intended to indicate that two values ​​are equal or approximately equal. In some embodiments, “substantially” may indicate that the values ​​differ from each other by about 10%, such as about 5%, or about 2%.

[0017] As used herein, the terms “the,” “a,” or “an” mean “at least one” and should not be limited to “only one” unless the contrary is explicitly stated. Thus, for example, reference to “a component” includes embodiments having two or more such components, unless the context clearly indicates otherwise.

[0018] As used herein, the term "axial" and its derivatives, such as "axially," should be understood as referring to the direction along the axis of the shaft configured to rotate during the operation of the device described herein. Furthermore, the term "radial" and its derivatives, such as "radially," should be understood with respect to the axis of the aforementioned shaft. For example, "radially outer" means further away from the axis, while "radially inner" means closer to the axis. The term "circumferential" and its derivatives, such as "circumferentially," should be understood with respect to the axis of the aforementioned shaft.

[0019] Now refer to Figures 1 to 8 The electric motor assembly 10 includes a rotor 12 and a stator 14, the stator being radially disposed outside the rotor 12. The stator 14 includes a stator core 16 and a plurality of windings 18. The stator core 16 extends axially from a first axial end 20 in a first direction to a second axial end 22 opposite to the first axial end 20. The plurality of windings 18 extend along the stator core 16. Each of the plurality of windings 18 includes a terminal end 24, which is axially positioned in the first axial direction outside the second axial end 22 of the stator core 16. At least one of the plurality of windings 18 is secured to a busbar 26 adjacent to the terminal end 24 of the at least one winding 18. A tray 28 is coupled to and supports the busbar 26. The tray 28 defines at least one receiving portion 30 through which at least one winding 18 extends.

[0020] Now refer to Figure 1 The electric motor assembly 10 can be part of the electric drive unit 32 for a vehicle, such as... Figure 1 As illustrated in the diagram. The electric motor assembly 10 includes a rotor 12 and a stator 14, with the stator radially disposed outside the rotor 12. Figure 1As illustrated, the rotor shaft 34 can be radially positioned inside the rotor 12 and can be configured to rotate about axis 36 during operation of the electric motor assembly 10. The electric drive unit 32 may include various other components, including a housing 38 that houses the motor, a gear set 40 operably coupled to the rotor shaft 34, and / or a differential 42 operably coupled to the gear set 40.

[0021] Now refer to Figures 1 to 5 The stator 14 of the electric motor assembly 10 includes a stator core 16. For example... Figures 1 to 3 As illustrated, the stator core 16 extends axially from a first axial end 20 along a first axial direction to a second axial end 22 opposite to the first axial end 20. Figure 3 As illustrated, the stator core 16 may include a plurality of teeth 44 circumferentially spaced to define a plurality of gaps 46 between adjacent teeth 44. The stator 14 also includes a plurality of windings 18. The plurality of windings 18 extend along the stator core 16. In various implementations, the windings 18 extend within the gaps 46 defined between adjacent teeth 44 of the stator core 16, such as... Figure 3 As illustrated herein, each winding of winding 18 includes a terminal end 24, which is axially positioned in a first axial direction outside a second axial end 22 of stator core 16. As further described herein, winding 18 may be secured to a busbar 26 adjacent to the terminal end 24 of winding 18.

[0022] Still refer to Figures 1 to 5 The electric motor assembly 10 includes busbars 26. In various implementations, the electric motor assembly 10 includes multiple busbars 26. For example, as... Figure 5 As illustrated, the electric motor assembly 10 includes a first busbar 48, a second busbar 50, a third busbar 52, and a fourth busbar 54. Figure 3 In the exemplary embodiment illustrated, the first busbar 48 is neutral, the second busbar 50 is the U-phase, the third busbar 52 is the V-phase, and the fourth busbar 54 is the W-phase. It is conceivable that in some embodiments, the electric motor assembly 10 may include various numbers of busbars 26, and the busbars 26 may be associated with various phases. The busbars 26 of the electric motor assembly 10 may include one or more radially outward-facing surfaces 56 and one or more radially inward-facing surfaces 58.

[0023] Still refer to Figures 1 to 5Multiple windings 18 are fixed to one or more busbars 26. In various implementations, the multiple windings 18 are fixed to one or more busbars 26 adjacent to the terminal ends 24 of the windings 18. In some implementations, the multiple windings 18 include at least one inner winding 60 and at least one outer winding 62. Figure 4 As illustrated, at least one inner winding 60 is coupled to a radially inward-facing surface 58 of busbar 26, and at least one outer winding 62 is fixed to a radially outward-facing surface 56 of busbar 26. The winding 18 can be fixed to one or more busbars 26 in various ways. For example, in some implementations, the winding 18 can be soldered to one or more busbars 26. In some implementations, the winding 18 can be fixed to one or more busbars 26 via conductive adhesive.

[0024] Now refer to Figures 2 to 8 The electric motor assembly 10 includes a tray 28. The tray 28 is coupled to and supports the busbar 26. Figure 3 , Figure 4 and Figure 6 As illustrated, tray 28 defines both: a recess 64 for receiving a first busbar 48; and a plurality of hollow portions 66 for receiving a second busbar 50, a third busbar 52, and a fourth busbar 54, respectively. Busbar 26 is supported by tray 28 and disposed within the recess 64 and / or hollow portions 66 defined by tray 28. In various implementations, tray 28 defines at least one receiving portion 30 axially positioned between the busbar 26 and the stator core 16 of the electric motor assembly 10. Figure 3 , Figure 4 , Figure 6 and Figure 7 As illustrated, tray 28 defines a plurality of receiving portions 30. Each receiving portion 30 is configured to receive a corresponding winding 18 passing through it, such as... Figure 3 and Figure 4 As shown in the diagram. Figure 4 and Figure 7 As illustrated, in various implementations, the plurality of receiving portions 30 may include at least one inner receiving portion 68 defined by the tray 28 and at least one outer receiving portion 70 defined by the tray 28 and radially positioned outside the at least one inner receiving portion 68. Figure 7 As illustrated, tray 28 defines a plurality of inner receiving portions 68 and a plurality of outer receiving portions 70 radially positioned outside the plurality of inner receiving portions 68.

[0025] Now refer to Figures 6 to 8 In some implementations, at least one receiving portion 30 defined by the tray 28 includes at least one hole 72. For example, as... Figure 6and Figure 7 As illustrated, tray 28 defines a plurality of receiving portions 30 in the form of holes 72. It is conceivable that various other types of receiving portions 30 may be defined by tray 28 and configured to receive corresponding windings 18 passing through the receiving portions. For example, the receiving portion 30 defined by tray 28 may be a slot, which, although not technically a hole 72, still restricts the removal of the winding 18 in a direction perpendicular to the longitudinal direction of the portion of the winding 18 extending through the receiving portion 30. In various implementations, at least one receiving portion 30 defined by tray 28 extends from a first opening 74 to a second opening 76 axially offset from the first opening 74. Figure 8 As illustrated, the portion of tray 28 defining at least one receiving portion 30 can taper inward as this portion extends axially in a first axial direction, such that the first opening 74 of at least one receiving portion 30 is larger than the second opening 76 of at least one receiving portion 30, as shown in the figure. Figure 8 As illustrated in the diagram. Figure 8 In the embodiment illustrated, tray 28 defines a plurality of holes 72 extending from a first opening 74 along a first axial direction to a second opening 76. As illustrated, the first opening 74 is larger than the second opening 76 because the portion of tray 28 defining the holes 72 tapers inward. This inward taper of the portion of tray 28 defining the holes 72 can result in a frictional engagement with the winding 18 extending through the holes, causing the winding 18 to move in a direction parallel to the longitudinal direction of the portion of the winding 18 extending through the holes 72. It is conceivable that, in various embodiments, the embodiment of tray 28—defining a receiving portion 30 that is not a hole 72—can restrict movement of the winding 18 in a direction parallel to the longitudinal direction of the portion of the winding 18 extending through the receiving portion 30.

[0026] Now refer to Figure 3 , Figure 4 , Figure 6 and Figure 7 In various implementations, tray 28 includes a support structure 78. The support structure 78 is configured to support at least one busbar 26 of the electric motor assembly 10. Furthermore, the support structure 78 defines a plurality of holes 72 configured to receive corresponding plurality of windings 18 passing through the holes. The support structure 78 includes a body 79 configured to support at least one busbar 26. For example, in Figure 3 and Figure 6 In the embodiment illustrated, the body 79 of the support structure 78 defines a recess 64 in which a first busbar 48 is received. The support structure 78 may include a guide member coupled to the body 79 and defining a plurality of receiving portions 30. Figure 3 , Figure 4 , Figure 6 and Figure 7In the embodiment illustrated, the support structure 78 of the tray 28 includes an inner guide member 80 and an outer guide member 82. The inner guide member 80 extends radially inward from the body 79 and defines a plurality of inner holes 68, such as... Figure 7 As illustrated in the diagram, the outer guide member 82 extends radially outward from the body 79 and defines a plurality of outer holes 70. Figure 7 As illustrated, the inner guide member 80 and the outer guide member 82 are generally arcuate, and the plurality of inner receiving portions 68 and the plurality of outer receiving portions 70 defined by the inner guide member 80 and the outer guide member 82, respectively, are circumferentially spaced apart from each other along the arcuate range of the inner guide member 80 and the outer guide member 82. Figure 7 As illustrated, at a given circumferential position occupied by the inner guide member 80, the innermost radial portion of the inner guide member 80 is the innermost radial portion of the tray 28 at the same circumferential position. Similarly, at a given circumferential position occupied by the outer guide member 82, the outermost radial portion of the outer guide member 82 is the outermost radial portion of the tray 28 at the same circumferential position. In various implementations, the tray 28 is formed of plastic or another material with low electrical conductivity.

[0027] Now refer to Figures 1 to 8 In an exemplary embodiment of the electric motor assembly 10, a first busbar 48, a second busbar 50, a third busbar 52, and a fourth busbar 54 are coupled to and supported by the body 79 of the tray 28. The tray 28 includes an inner guide member 80 coupled to the body 79 and an outer guide member 82 coupled to the body 79. The inner guide member 80 defines a plurality of inner holes 68, and the outer guide member 82 defines a plurality of outer holes 70. Each of the inner holes 68 and outer holes 70 extends from a first opening 74 in a first axial direction to a second opening 76. The first opening 74 is larger than the second opening 76. The larger first opening 74 allows the terminal ends 24 of the plurality of inner windings 60 and outer windings 62 to be relatively easily inserted along the first axial direction through the corresponding inner holes 68 and outer holes 70, respectively, when the tray 28 is moved to an assembled state in a second axial direction opposite to the first axial direction. Figure 3 As illustrated in the diagram, a second opening 76, smaller than the first opening 74, in each of the plurality of inner holes 68 and the plurality of outer holes 70 ensures that contact is maintained between the tray 28 and the winding 18 received through the hole 72, such that forces applied to the winding 18 are transmitted to the tray 28. Figure 4As illustrated, one or more of the plurality of inner windings 60 are fixed to the radially inward-facing surface 58 of each of the first busbar 48, the second busbar 50, the third busbar 52, and the fourth busbar 54. Furthermore, one or more of the plurality of outer windings 62 are fixed to the radially outward-facing surface 56 of each of the first busbar 48, the second busbar 50, the third busbar 52, and the fourth busbar 54.

[0028] In the operation of the exemplary embodiment, the tray 28 supports the busbar 26 and restricts the movement of the winding 18, which is fixed to the busbar 26, relative to the busbar 26. Therefore, the connection point between the winding 18 and the busbar 26 is shielded from stresses that could otherwise cause a disconnection.

[0029] It will be understood that variations and modifications may be made to the foregoing structure without departing from the concepts of this disclosure, and it will also be understood that these concepts are intended to be covered by the appended claims unless those claims expressly state otherwise in their language.

[0030] List of reference numerals 10 Electric Motor Components 12 rotors 14 stators 16 stator core 18 windings 20 First axial end 22 Second axial end 24 terminal end 26 busbars 28 trays 30 Reception Department 32 electric drive units 34 rotor shafts 36 axis 38 housing 40 gear set 42 differential 44 teeth 46 gaps 48 First Convergence Line 50 Second Confluence 52 Third Confluence 54 Fourth Confluence 56 Radial outward-facing surfaces 58 Radial facing inwards surface 60 inner winding 62 outer windings 64 recesses 66 Hollow Section 68 Inner receiving part / inner hole 70 External receiving part / external hole 72 holes 74 First Opening 76 Second Opening 78 Support Structure 79 body 80 Internal Guiding Components 82 external guidance components

Claims

1. An electric motor assembly, comprising: Rotor; A stator, radially disposed outside the rotor, and comprising: Stator core, the stator core extending axially from a first axial end in a first axial direction to a second axial end opposite to the first axial end; and A plurality of windings extending along the stator core, each of the plurality of windings including a terminal end, the terminal end being axially positioned outside the second axial end of the stator core in the first axial direction; A busbar, wherein at least one of the plurality of windings is fixed to the busbar adjacent to the terminal end of the at least one winding; and A tray, which is coupled to and supports the busbar and defines at least one receiving portion through which at least one winding extends.

2. The electric motor assembly according to claim 1, wherein, The at least one receiving portion is axially positioned between the busbar and the stator core.

3. The electric motor assembly according to claim 2, wherein, The at least one receiving portion extends from the first opening to a second opening that is axially offset from the first opening, and the portion of the tray defining the at least one receiving portion tapers inward as the portion extends axially in the first axial direction, such that the first opening is larger than the second opening.

4. The electric motor assembly according to claim 3, wherein, The tray is configured to remain in contact with the at least one winding at the second opening of the at least one receiving portion.

5. The electric motor assembly according to claim 1, wherein, The at least one receiving part includes at least one hole.

6. The electric motor assembly according to claim 1, wherein, The at least one winding extending through the at least one receiving portion defined by the tray is fixed to at least one of the radially outward-facing surface of the busbar and the radially inward-facing surface of the busbar.

7. The electric motor assembly according to claim 6, wherein, The at least one winding extending through the at least one receiving portion defined by the tray is fixed to the radially outward-facing surface of the busbar.

8. The electric motor assembly according to claim 6, wherein, The at least one winding extending through the at least one receiving portion defined by the tray is fixed to the radially inward-facing surface of the busbar.

9. The electric motor assembly according to claim 6, wherein, The at least one receiving part includes: At least one inner receiving portion, said at least one inner receiving portion being defined by the tray; and At least one outer receiving portion, the at least one outer receiving portion being defined by the tray and radially positioned outside the at least one inner receiving portion.

10. The electric motor assembly according to claim 9, wherein, The at least one winding includes: At least one inner winding, the at least one inner winding extending through the at least one inner receiving portion defined by the tray and secured to the radially inward-facing surface of the busbar; and At least one outer winding extends through the at least one outer receiving portion defined by the tray and is secured to the radially outward-facing surface of the busbar.

11. The electric motor assembly according to claim 10, wherein, The at least one inner receiving portion includes a plurality of inner receiving portions, the at least one outer receiving portion includes a plurality of outer receiving portions, the at least one inner winding includes a plurality of inner windings that extend through the corresponding plurality of inner receiving portions, and the at least one outer winding includes a plurality of outer windings that extend through the corresponding plurality of outer receiving portions.

12. The electric motor assembly according to claim 11, wherein, The tray includes: Body, which supports the busbar; An inner guide member extending radially inward from the body and defining the plurality of inner receiving portions; and An external guide member extends radially outward from the body and defines the plurality of external receiving portions.

13. The electric motor assembly according to claim 12, wherein, At a given circumferential position occupied by the inner guide member, the innermost radial portion of the inner guide member is the innermost radial portion of the tray at the given circumferential position occupied by the inner guide member.

14. The electric motor assembly according to claim 12, wherein, At a given circumferential position occupied by the outer guide member, the outermost radial portion of the outer guide member is the outermost radial portion of the tray at the given circumferential position occupied by the outer guide member.

15. A tray for an electric motor assembly, the tray comprising: A support structure configured to support at least one busbar of the electric motor assembly and defining a plurality of holes configured to receive corresponding plurality of windings passing through the plurality of holes, the plurality of windings being configured to be fixed to the at least one busbar.

16. The pallet according to claim 15, wherein, At least one of the plurality of holes extends from a first opening to a second opening, wherein the first opening is larger than the second opening.

17. The tray according to claim 15, wherein, The plurality of holes includes a plurality of inner holes and a plurality of outer holes, the plurality of outer holes being radially positioned outside the plurality of inner holes, and wherein the support structure includes: Body, the body being configured to support the at least one busbar; An inner guide member extending radially inward from the body and defining the plurality of inner holes; and An external guide member extends radially outward from the body and defines the plurality of external holes.

18. The tray according to claim 17, wherein, At a given circumferential position occupied by the inner guide member, the innermost radial portion of the inner guide member is the innermost radial portion of the tray at the given circumferential position occupied by the inner guide member.

19. The tray according to claim 18, wherein, At a given circumferential position occupied by the outer guide member, the outermost radial portion of the outer guide member is the outermost radial portion of the tray at the given circumferential position occupied by the outer guide member.

20. An electric motor assembly, comprising: Stator, the stator comprising: Stator core; and Multiple windings extending along the stator core; Busbar, the plurality of windings being fixed to the busbar; and A tray, which is connected to and supports the busbar and defines a plurality of holes through which the plurality of windings extend respectively.

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