Motor and vehicle power system

Abstract

The embodiment of the utility model provides a motor and a vehicle power system, the motor comprises a stator assembly and a rotor assembly, the stator assembly comprises a stator core (1), and the stator core (1) is provided with a winding slot (11); the winding (2) is installed in the winding groove (11), winding ends (21) at the two axial ends of the winding (2) are exposed out of the end of the stator core (1), the stator assembly further comprises an outlet end oil cover (4), the outlet end oil cover (4) is arranged at one axial end of the stator core (1), an outlet end oil cavity is defined by the outlet end oil cover (4), the stator core (1) and the winding ends (21), the outlet end oil cavity can contain oil liquid, and the outlet end oil cavity can contain oil liquid. The winding end portion (21) is at least partially immersed in the oil, the outlet end oil cavity is provided with an oil outlet (44), the oil outlet (44) is located at the top of the outlet end oil cavity, the outlet end oil cavity is open, and the oil outlet (44) is not connected with a pipeline or a connector.

Description

Technical Field

[0001] The present application relates to an electric motor and a vehicle power system. Background Art

[0002] With the development of new energy vehicles, drive motors are gradually developing towards small size and high power density, which places high demands on the heat dissipation performance of drive motors. There are various cooling methods for existing motors, among which oil cooling has the best effect.

[0003] like Fig. 9 As shown, in a possible technical solution, the motor includes a stator assembly, the stator assembly includes a stator core 1, a winding 2 and an outlet oil cover 4, the outlet oil cover 4 and the stator core 1, the winding 2 form an outlet oil chamber, the outlet oil chamber contains oil, the end of the winding 2 can be immersed in the oil for cooling, and the oil outlet 44 needs to form a closed oil circuit by connecting the oil pipe.

[0004] Patent application CN116455105A proposes a motor stator cooling structure and a motor, wherein a second sealing oil cover is provided with a plurality of oil outlet holes, and the plurality of oil outlet holes are arranged along the circumference of the second sealing oil cover.

[0005] However, in the above two technical solutions, the oil outlet hole is relatively small, resulting in a higher oil pressure on the outlet side, which places higher requirements on the sealing of the oil outlet side. Utility Model Content

[0006] The present application aims to propose a motor to solve or alleviate the problem that the pressure of cooling oil in the motor is high and the sealing requirement of the motor is high.

[0007] The embodiment of the present application provides a motor, including a stator assembly and a rotor assembly, wherein the stator assembly includes:

[0008] a stator core provided with winding slots; and

[0009] A winding, wherein the winding is installed in the winding slot, and winding ends at both axial ends of the winding are exposed from ends of the stator core,

[0010] The stator assembly further includes an outlet oil cover, which is disposed at one axial end of the stator core. The outlet oil cover and the stator core form an outlet oil chamber, which is capable of containing oil. In the outlet oil chamber, the winding end is at least partially immersed in the oil.

[0011] The outlet end oil chamber is provided with an oil outlet, the oil outlet is located at the top of the outlet end oil chamber, the outlet end oil chamber is open, and the oil outlet is not connected to a pipeline or a joint.

[0012] In at least one possible embodiment, the outlet oil cover includes:

[0013] An outer peripheral wall, wherein the outer peripheral wall is in an incomplete cylindrical shape with a notch, and the oil outlet is located at the notch of the outer peripheral wall;

[0014] an inner peripheral wall, the inner peripheral wall being cylindrical and located radially inward of the outer peripheral wall; and

[0015] The end wall is connected to the inner peripheral wall and the outer peripheral wall.

[0016] In at least one possible embodiment, an extension section is provided at the upper end of the outer peripheral wall, and the extension section makes the height of the top of the outlet oil cover equal to or greater than the height of the top of the winding end, so that the oil in the outlet oil chamber can immerse the winding end.

[0017] In at least one possible implementation manner, the oil outlet is an upward opening and is rectangular.

[0018] In at least one possible embodiment, the stator assembly further includes a support ring, which includes an annular plate portion and a circular ring portion, wherein the annular plate portion is abutted against the axial end surface of the stator core, and the circular ring portion is located radially inward of the winding end portion and extends from the annular plate portion toward the axial outer side of the stator core.

[0019] In at least one possible embodiment, the end wall is located at one axial end of the outlet oil cover, and the other axial end of the outlet oil cover is clamped with one axial end of the annular portion of the support ring through a convex-concave structure, or overlapped through a step structure.

[0020] The outlet oil cover, the stator core and the support ring form an outlet oil chamber.

[0021] In at least one possible embodiment, the stator assembly includes a sealing strip inserted into the winding slot of the stator core, the other axial end of the annular portion abuts against the sealing strip and the stator core, and the axial end of the sealing strip has a step structure, which is overlapped with the annular portion of the support ring, so that the sealing strip supports the annular portion of the support ring in the axial and radial directions of the stator assembly.

[0022] In at least one possible embodiment, the stator assembly further includes an inlet oil cover, which is disposed at the other axial end of the stator core, and the inlet oil cover and the stator core form an inlet oil chamber, and the inlet oil chamber is connected to the outlet oil chamber.

[0023] In at least one possible implementation manner, the two support rings are respectively disposed at two axial ends of the stator core, and the support rings are provided with a plurality of through holes, through which the windings pass.

[0024] An embodiment of the present application further proposes a vehicle power system, comprising a motor as described in any one of the above technical solutions.

[0025] By adopting the above technical solution, an open structure oil outlet is used without using pipelines or joints, so that the oil pressure in the oil chamber at the outlet end can be lowered and the requirements for sealing performance are lowered. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A partial structural schematic diagram of a stator assembly of an electric machine of a vehicle power system according to an embodiment of the present application is shown.

[0027] Figure 2 A partial cross-sectional view of a stator assembly of a motor of a vehicle power system according to an embodiment of the present application is shown.

[0028] Figure 3 A schematic structural diagram of a stator core of a stator assembly of an electric motor of a vehicle power system according to an embodiment of the present application is shown.

[0029] Figure 4 A schematic structural diagram of the winding of the stator assembly of the motor of the vehicle power system according to an embodiment of the present application is shown.

[0030] Figure 5 A schematic structural diagram of an oil cover at an outlet end of a stator assembly of an electric motor of a vehicle power system according to an embodiment of the present application is shown.

[0031] Figure 6 A schematic structural diagram of a support ring of a stator assembly of an electric motor of a vehicle power system according to an embodiment of the present application is shown.

[0032] Figure 7 A schematic structural diagram of a sealing strip of a stator assembly of an electric motor of a vehicle power system according to an embodiment of the present application is shown.

[0033] Figure 8 A schematic structural diagram of the insulating paper of the stator assembly of the motor of the vehicle power system according to an embodiment of the present application is shown.

[0034] Fig. 9 A cross-sectional view of a stator assembly of an electric machine is shown according to a possible technical solution.

[0035] Description of Reference Numerals

[0036] 1 stator core 11 winding slots

[0037] 2 Winding 21 Winding end

[0038] 3 support ring 31 through hole 32 ring plate portion 33 circular ring portion

[0039] 4 Outlet oil cover

[0040] 41 Inner wall

[0041] 42 Outer wall

[0042] 43 end wall

[0043] 44 Oil outlet

[0044] 45 Extension

[0045] 5 Sealing strip

[0046] 6 Insulation Paper DETAILED DESCRIPTION

[0047] The following will describe in detail various exemplary embodiments, features and aspects of the present invention with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0048] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0049] In addition, in order to better illustrate the present invention, numerous specific details are provided in the following specific embodiments. It should be understood by those skilled in the art that the present invention can be implemented without certain specific details. In other examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present invention.

[0050] like Figures 1 to 8 As shown, the embodiment of the present application provides a vehicle power system, which can be particularly applied to pure electric vehicles or hybrid electric vehicles. The vehicle power system includes a motor.

[0051] The motor includes a stator assembly and a rotor assembly, and the stator assembly can be arranged radially outside the rotor assembly.

[0052] The stator assembly includes a stator core 1 , a winding 2 , a support ring 3 , an oil cover, a sealing strip 5 and an insulating paper 6 .

[0053] like Figures 1 to 3As shown, the stator core 1 may be annular or cylindrical, and the stator core 1 may be formed by stacking a plurality of stator punching sheets together. The stator core 1 is provided with a plurality of winding slots 11, and the plurality of winding slots 11 are evenly arranged along the circumferential direction C of the stator core 1. The winding slots 11 may form openings on the inner circumferential wall of the stator core 1. The winding slots 11 penetrate the stator core 1 along the axial direction A of the stator core 1, and the winding slots 11 are used to accommodate the winding 2, and the winding ends 21 at the axial ends of the winding 2 may be exposed from the ends of the stator core 1.

[0054] like Figure 2 and Figure 7 As shown, the sealing strip 5 is in a strip shape and can be disposed at the opening of the winding slot 11 formed on the inner peripheral wall of the stator core 1 to seal the radial inner opening of the winding slot 11 .

[0055] It is understood that other methods can be used to seal the radial inner opening of the winding slot 11. For example, transfer molding (injection molding of thermosetting resin) can be used. In another example, a stator core with closed slots can be used (that is, the stator core itself does not have a radial inner opening).

[0056] like Figure 2 and Figure 8 As shown, the insulating paper 6 as an insulating member can be arranged between the winding 2 and the wall of the winding slot 11, and the insulating paper 6 can wrap the winding 2 in the winding slot 11. Of course, the present application is not limited to this, and in another example, the insulating member can be formed by transfer molding to replace the insulating paper.

[0057] like Figure 1 , Figure 2 and Figure 6 As shown, the support ring 3 may be annular, and the support ring 3 may be arranged at both axial ends of the stator core 1. Optionally, the support ring 3 may be fixedly connected to the stator core 1 by adhesive or bolts. It is understood that the support ring 3 may also be connected to the stator core 1 by other methods such as injection molding. The support ring 3 is provided with a plurality of through holes 31, and the through holes 31 may be bar-shaped, and the winding 2 may pass through the through holes 31.

[0058] The support ring 3 may include an annular plate portion 32 and an annular portion 33 . The annular plate portion 32 may be attached to the axial end surface of the stator core 1 . The annular portion 33 may be located radially inside the winding end 21 and extend from the annular plate portion 32 toward the axial outside of the stator core 1 .

[0059] like Figure 1 , Figure 2 and Figure 5As shown, the oil cover includes an inlet end oil cover and an outlet end oil cover 4, which are respectively arranged at the axial ends of the stator core 1. The inlet end oil cover, the stator core 1, and the support ring 3 form an inlet end oil chamber, and the outlet end oil cover 4, the stator core 1, and the support ring 3 form an outlet end oil chamber. The inlet end oil chamber and the outlet end oil chamber can be connected through the axial oil passage of the stator core 1.

[0060] The oil may enter the inlet oil chamber from the inlet oil cover, and then flow to the outlet oil chamber through the stator core 1 along the axial direction A. In the inlet oil chamber and the outlet oil chamber, the winding end 21 may be at least partially immersed in the oil.

[0061] The outlet oil cavity is provided with an oil outlet 44 , which may be located at the top of the outlet oil cavity. The oil outlet 44 is an upward opening and may be rectangular.

[0062] The outlet end oil cover 4 includes an inner peripheral wall 41, an outer peripheral wall 42 and an end wall 43. The inner peripheral wall 41 may be cylindrical, and the inner peripheral wall 41 may extend along the axial direction A and the circumferential direction C of the motor. The outer peripheral wall 42 may be an incomplete cylindrical shape, and the outer peripheral wall 42 may extend along the axial direction A and the circumferential direction C of the motor. The upper part of the outer peripheral wall 42 has a notch, and the outer peripheral wall 42 does not form a closed shape. The oil outlet 44 may be located at the notch position of the outer peripheral wall 42. The end wall 43 may be a flat plate extending in the radial and circumferential directions of the motor, and the inner peripheral wall 41 and the outer peripheral wall 42 are both connected to the end wall 43, and the inner peripheral wall 41 may be located radially inside the outer peripheral wall 42.

[0063] Reference Figure 2 , one axial end of the annular portion 33 of the support ring 3 ( Figure 2 The right end in FIG. 1 is far away from the annular plate portion 32, and the annular plate portion 32 is located at the other axial end ( Figure 2 The other axial end of the annular portion 33 of the support ring 3 ( Figure 2 The left end of the sealing strip 5 can abut against the sealing strip 5 and the stator core 1. In an advantageous manner, the axial (axial direction of the motor or stator assembly) cross section of one axial end of the sealing strip 5 can have a step structure, and the step structure overlaps the annular portion 33 of the support ring 3, so that the sealing strip 5 can support the annular portion 33 of the support ring 3 in the axial direction A and in the radial direction. The positioning of the support ring 3 is easier, more accurate and more stable.

[0064] The end wall 43 is located at one axial end of the outlet oil cover 4, and the other axial end of the outlet oil cover 4 (the axial inner end, the opposite end of the end wall 43) is aligned with one axial end of the annular portion 33 of the support ring 3 ( Figure 2In an advantageous manner, the other axial end of the outlet oil cover 4 and the axial end of the annular portion 33 of the support ring 3 can be clamped by a convex-concave structure, or overlapped by a step structure, so that the positioning of the outlet oil cover 4 is easier, more accurate and more stable.

[0065] Through the above structure, the sealing state of the oil chamber at the inlet end and the oil chamber at the outlet end can be improved with fewer and simpler components, thereby reducing unexpected leakage of oil and improving the cooling effect.

[0066] It can be understood that at the other axial end of the stator core 1 ( Figure 2 The support ring 3, the stator core 1, the sealing strip 5 and the inlet end oil cover can be installed together in the same or similar manner.

[0067] In one example, the support ring 3 and the oil cover may be made of plastic or include plastic, which is beneficial to the sealing of the inlet end oil cavity and the outlet end oil cavity while reducing the weight of the stator assembly.

[0068] The upper end of the peripheral wall 42 is provided with an extension section 45, for example, extending straightly. The extension section 45 can make the height of the top of the outlet oil cover 4 equal to or greater than the height of the top of the winding end 21, so that the oil in the outlet oil chamber can immerse the winding end 21. The outlet oil chamber (or the oil outlet 44) is open, and the oil outlet 44 is not connected to a pipeline or a joint. The oil pressure of the outlet oil chamber can be relatively small, close to atmospheric pressure. When the oil in the outlet oil chamber accumulates and reaches the top of the outlet oil cover 4, the oil can flow to the outside of the stator assembly through the oil outlet 44. Since the oil pressure of the outlet oil chamber is relatively small, the requirements for sealing performance and dimensional accuracy are relatively low, and the assembly is simple, so that the cost of the motor is relatively low.

[0069] The motor and vehicle drive system of the present application can achieve the following beneficial effects.

[0070] (1) The open structure of the oil outlet can make the oil pressure in the oil chamber at the outlet lower, without the need for pipes or joints.

[0071] (2) The oil pressure in the outlet oil chamber is lower, and the requirements for sealing performance are lower.

[0072] It should be understood that at least some aspects or features of the above-mentioned implementation modes, embodiments or examples may be appropriately combined.

[0073] It is understood that in the present application, when the number of parts or components is not particularly limited, the number may be one or more, and the multiple here means two or more. For the case where the number of parts or components shown in the drawings and / or described in the specification is a specific number such as two, three, four, etc., the specific number is usually exemplary and not restrictive, and it can be understood as multiple, that is, two or more, but this does not mean that the present application excludes the case of one.

[0074] In the present application, unless otherwise clearly stated or limited, the terms such as "install", "assemble", "assemble", "connect", "connect", "couple", "link", "abut", "connect", "interconnect", "intercommunication", "conduction", "fixation", "fastening" and the like should be understood in a broad sense, for example, they can be direct or indirect. For example, regarding connection, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly stated or limited. For example, regarding connectivity / conduction, it can be direct connectivity / conduction, or it can be indirect connectivity / conduction via an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0075] In the present application, unless otherwise clearly stated or limited, a component disposed on / installed on / located on / accommodated on / placed in, within, inside, etc. another component may be any of the following two situations: a part or most of the one component is located in the other component; and the one component is completely accommodated in the other component.

[0076] Although the present application is described in detail using the above-mentioned embodiments, it is obvious to those skilled in the art that the present application is not limited to the embodiments described in this specification. The present application can be modified and implemented as a modified embodiment without departing from the subject matter and scope of the present application as determined by the claims. Therefore, the description in this specification is for the purpose of illustration and does not have any restrictive meaning for the present application.

Claims

1. A motor, comprising a stator assembly and a rotor assembly, wherein the stator assembly comprises: A stator core, wherein the stator core is provided with winding slots; as well as A winding, wherein the winding is installed in the winding slot, and winding ends at both axial ends of the winding are exposed from ends of the stator core, The stator assembly is characterized in that the stator assembly further comprises an outlet oil cover, the outlet oil cover is arranged at one axial end of the stator core, the outlet oil cover and the stator core form an outlet oil chamber, the outlet oil chamber can contain oil, and the winding end is at least partially immersed in the oil in the outlet oil chamber. The outlet end oil chamber is provided with an oil outlet, the oil outlet is located at the top of the outlet end oil chamber, the outlet end oil chamber is open, and the oil outlet is not connected to a pipeline or a joint.

2. The motor according to claim 1, characterized in that The outlet oil cover comprises: An outer peripheral wall, wherein the outer peripheral wall is in an incomplete cylindrical shape with a notch, and the oil outlet is located at the notch of the outer peripheral wall; an inner peripheral wall, the inner peripheral wall being cylindrical and located radially inward of the outer peripheral wall; and The end wall is connected to the inner peripheral wall and the outer peripheral wall.

3. The motor according to claim 2, characterized in that An extension section is provided at the upper end of the outer peripheral wall, through which the height of the top of the outlet oil cover is equal to or greater than the height of the top of the winding end, so that the oil in the outlet oil cavity can immerse the winding end.

4. The motor according to claim 1, characterized in that The oil outlet is an upward opening and is rectangular.

5. The motor according to claim 2, characterized in that: The stator assembly also includes a support ring, which includes an annular plate portion and an annular portion. The annular plate portion is attached to the axial end surface of the stator core, and the annular portion is located radially inside the winding end and extends from the annular plate portion toward the axial outside of the stator core.

6. The motor according to claim 5, characterized in that The end wall is located at one axial end of the outlet oil cover, and the other axial end of the outlet oil cover is connected to one axial end of the annular portion of the support ring through a convex-concave structure, or overlapped through a step structure. The outlet oil cover, the stator core and the support ring form an outlet oil chamber.

7. The motor according to claim 5, characterized in that The stator assembly includes a sealing strip inserted into the winding slot of the stator core, the other axial end of the annular portion abuts against the sealing strip and the stator core, and the axial end of the sealing strip has a step structure, which is overlapped with the annular portion of the support ring, so that the sealing strip supports the annular portion of the support ring in the axial and radial directions of the stator assembly.

8. The motor according to claim 1, characterized in that The stator assembly further comprises an inlet oil cover, which is arranged at the other axial end of the stator core. The inlet oil cover and the stator core form an inlet oil chamber, and the inlet oil chamber is connected to the outlet oil chamber.

9. The motor according to claim 5, characterized in that The two support rings are respectively arranged at two axial ends of the stator core, and the support rings are provided with a plurality of through holes, through which the windings pass.

10. A vehicle power system, characterized in that: A motor comprising any one of claims 1 to 9.

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