Motor stator, water-cooled motor and vehicle power system

Abstract

This application discloses a motor stator, a water-cooled motor, and a vehicle power system. The motor stator includes: a stator core comprising multiple stacked stator laminations, the stator core having rivet holes penetrating the stator core along its axial direction; end rings disposed at both ends of the stator core along its axial direction, the surface of the end rings facing the stator core having grooves extending circumferentially along the stator core, the grooves forming circumferential cooling channels, the end rings having inlets and outlets; and rivets disposed in the rivet holes, the rivets riveting and pressing the multiple stator laminations together, the rivets being hollow, the hollow rivets forming axial cooling channels, the axial cooling channels and circumferential cooling channels communicating to form stator cooling channels, the coolant being able to circulate within the stator cooling channels, and the end rings not leaking or spraying the coolant to the outside of the motor stator or the windings.

Description

Technical Field

[0001] This application belongs to the field of vehicle power technology, and specifically relates to an electric motor stator, a water-cooled motor, and a vehicle power system. Background Technology

[0002] In a potential hybrid transmission, the two stators of a dual-rotor motor are integrated, generating significant heat. Therefore, the cooling effect of the stator plays a crucial role in the performance of the hybrid transmission. Existing stator cooling solutions typically involve spraying a cooling medium onto the ends of the windings or having the cooling medium flow through the stator core. Oil is commonly used as the cooling medium due to its lubricating properties. However, oil has a low thermal conductivity, resulting in generally poor stator cooling. Especially under high heat loads, the cooling effect will impact the sustained performance of the dual-rotor motor. Utility Model Content

[0003] This application aims to provide a motor stator with better cooling performance.

[0004] An embodiment of this application provides a motor stator, comprising:

[0005] The stator core includes multiple stacked stator laminations, and the stator core is provided with rivet holes that penetrate the stator core along the axial direction of the motor stator.

[0006] End rings, wherein the end rings are disposed at both axial ends of the stator core, and the surface of the end rings facing the stator core is provided with grooves extending circumferentially along the motor stator, the grooves forming circumferential cooling channels; the end rings are provided with liquid inlets and liquid outlets; and

[0007] A rivet is disposed in the rivet hole and the rivet rivets and presses together multiple stator laminations. The rivet is hollow and forms an axial cooling channel. The axial cooling channel and the circumferential cooling channel are connected to form a stator cooling channel, in which coolant can circulate.

[0008] In at least one possible implementation, both the liquid inlet and the liquid outlet are located on the end ring at one axial end of the motor stator.

[0009] In at least one possible implementation, the inlet and outlet are connected to a coolant circulation pump, and both ends of the stator cooling channel are connected to the coolant circulation pump to form a closed circulation channel, wherein the end ring does not leak or spray the coolant to the outside of the motor stator or the windings.

[0010] In at least one possible implementation, the end ring includes a first end ring and a second end ring, the first end ring and the second end ring being respectively disposed at both axial ends of the stator core.

[0011] The surface of the first end ring facing the stator core is provided with a first groove, and the surface of the second end ring facing the stator core is provided with a second groove. In the circumferential direction, the first groove and the second groove are connected end to end.

[0012] In at least one possible implementation, the stator core is provided with a stator core fixing hole, the stator core fixing hole penetrating the stator core along the axial direction.

[0013] The end ring is provided with an end ring fixing hole, which penetrates the end ring along the axial direction. The stator core fixing hole and the end ring fixing hole are aligned in the circumferential direction of the motor stator.

[0014] In at least one possible implementation, the stator laminations are not axially fixed using welding processes, snap-fit ​​structures, or fastening structures.

[0015] In at least one possible implementation, the stator laminations are axially clamped and fixed only by the rivets.

[0016] In at least one possible implementation, the motor stator is the stator of a dual-rotor motor.

[0017] The motor stator includes a first stator and a second stator, the second stator being disposed radially outside the first stator. The first stator and the second stator share a stator core. The windings of the first stator and the windings of the second stator are both disposed on the stator core. In the radial direction of the motor stator, the stator cooling channel is located between the windings of the first stator and the windings of the second stator.

[0018] The embodiments of this application also propose a water-cooled motor, including the motor stator described in any of the above technical solutions, wherein the coolant is water or an aqueous solution.

[0019] The embodiments of this application also propose a vehicle power system, including the motor stator described in any one of the above technical solutions, or the water-cooled motor described in the above technical solutions.

[0020] By adopting the above technical solution, a stator cooling channel is formed by hollow rivets and grooves on the end ring. The stator cooling channel can accommodate water-based cooling medium, resulting in a better cooling effect for the motor stator. Attached Figure Description

[0021] Figure 1A schematic diagram of the structure of the stator of a water-cooled motor according to an embodiment of this application is shown.

[0022] Figure 2 A schematic diagram of the stator of a water-cooled motor according to an embodiment of this application is shown from another angle.

[0023] Figure 3 A cross-sectional view of the stator of a water-cooled motor according to an embodiment of this application is shown.

[0024] Figure 4 It shows Figure 3 A magnified view of a portion of the image.

[0025] Figure 5 A schematic diagram of the end ring and rivets of the stator of a water-cooled motor according to an embodiment of this application is shown.

[0026] Figure 6 A structural schematic diagram of the end ring and rivet of the motor stator of a water-cooled motor according to an embodiment of this application is shown at another angle.

[0027] Figure 7 A schematic diagram of the structure of the first end ring of the stator of a water-cooled motor according to an embodiment of this application is shown.

[0028] Figure 8 A schematic diagram showing another angle of the first end ring of the stator of a water-cooled motor according to an embodiment of this application is shown.

[0029] Figure 9 A schematic diagram of the structure of the second end ring of the stator of a water-cooled motor according to an embodiment of this application is shown.

[0030] Figure 10 A schematic diagram showing another angle of the second end ring of the stator of a water-cooled motor according to an embodiment of this application is shown.

[0031] Figure 11 A front view of the motor stator (end ring not shown) of a water-cooled motor according to an embodiment of this application is shown.

[0032] Explanation of reference numerals in the attached figures

[0033] 100 First stator winding 200 Second stator winding

[0034] 1. Stator core 11. Stator core fixing holes

[0035] 2. End ring 21, first end ring 211, first groove 22, second end ring 221, second groove

[0036] 23 Inlet 24 Outlet 25 End ring fixing hole

[0037] 3 rivets

[0038] A-axis and C-circumferential direction Detailed Implementation

[0039] To more clearly illustrate the above-mentioned objectives, features, and advantages of this application, specific embodiments of this application are described in detail in conjunction with the accompanying drawings in this section. Besides the embodiments described in this section, this application can also be implemented in other different ways. Those skilled in the art can make corresponding improvements, modifications, and substitutions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application should be determined by the claims.

[0040] This application provides a vehicle powertrain system, which can be a hybrid powertrain system for a hybrid vehicle. The hybrid powertrain system includes a hybrid transmission (DHT), an internal combustion engine, and a coolant circulation pump. The hybrid transmission (DHT) can be connected to the internal combustion engine. The coolant circulation pump is used to circulate the coolant supplied to the hybrid transmission (DHT).

[0041] The hybrid transmission (DHT) includes an electric motor, which can be a dual-rotor motor.

[0042] A dual-rotor motor may include a first motor unit and a second motor unit. The second motor unit may be located radially outside the first motor unit, and the first motor unit and the second motor unit may be arranged coaxially.

[0043] The first motor unit includes a first stator and an inner rotor, the inner rotor being disposed radially inside the first stator. The second motor unit includes a second stator and an outer rotor, the outer rotor being disposed radially outside the second stator, and the second stator being disposed radially outside the first stator. The inner and outer rotors are coaxially arranged. This motor uses water or an aqueous solution as a cooling medium, and is a water-cooled motor.

[0044] The first stator and the second stator can share a stator core 1, and the windings 100 of the first stator and the windings 200 of the second stator can both be located on the stator core 1.

[0045] like Figures 1 to 11 As shown, the motor stator includes a stator core 1, end rings 2, and rivets 3. The stator core 1 includes multiple stacked stator laminations, which are fixedly connected together by rivets 3. The end rings 2 can be disposed at both ends of the stator core 1 along its axial direction.

[0046] The stator core 1 may be provided with rivet holes, which penetrate the stator core 1 along the axial direction A of the motor stator. Multiple rivet holes may be provided along the circumferential direction C of the motor stator; for example, 12 rivet holes may be provided.

[0047] Rivet 3 can be set in rivet hole. Multiple stator laminations can be pressed together at both ends of rivet 3. During the riveting process, rivet 3 can use its own deformation or interference fit to rivet and press the multiple stator laminations together. Rivet 3 is hollow, thus forming an axial cooling channel in the center of rivet 3, which allows coolant to pass through.

[0048] The stator laminations can be axially clamped and fixed by riveting with rivets 3, without using welding processes, snap-fit ​​structures, or interlocking structures (also known as self-locking points) for axial fixation.

[0049] It is understandable that self-locking points, which rely on the structural snap-fit ​​or fastening of the stator laminations, have relatively low fixing strength. This can easily cause the stator core to loosen during the assembly of the insulating paper and windings, thus affecting the assembly progress. This application uses rivets 3 to fix multiple stator laminations, ensuring that the laminations are completely and securely fitted together axially, preventing loosening. The firmly fixed stator laminations improve the motor's NVH performance. While self-locking points increase losses in the stator core's magnetic circuit, thus reducing motor efficiency, this application uses rivets 3 to lock the stator laminations, resulting in lower magnetic circuit losses in the stator core and contributing to improved motor efficiency.

[0050] Optionally, the rivet 3 can be made of copper. Copper has good thermal conductivity, which is conducive to heat exchange between the coolant in the center of the rivet 3 and the stator core 1.

[0051] The surface of the end ring 2 facing the stator core 1 can be provided with a groove. The groove can extend along the circumferential direction C of the motor stator to form a circumferential cooling channel. The circumferential cooling channel and the axial cooling channel are connected to form a stator cooling channel. Figure 5 and Figure 6 The unidirectional arrows in the diagram indicate the flow direction of the coolant in the stator cooling channel.

[0052] The circumferential cooling channel and the axial cooling channel are connected to form an independent "U"-shaped channel or multiple consecutive "U"-shaped channels (i.e., a serpentine channel). The axial cooling channel can form the straight part of the "U" shape, and the circumferential cooling channel can form the bottom of the "U" shape. The coolant can flow along the circumferential cooling channel at one end of the axial direction along the end ring 2, and then flow along the axial cooling channel to the other end of the axial direction along the circumferential cooling channel, thereby cooling the stator core 1. In the radial direction of the motor stator, the stator cooling channel is located between the winding 100 of the first stator and the winding 200 of the second stator.

[0053] The end ring 2 may be provided with an inlet 23 and an outlet 24, which can be aligned with the position of the rivet 3 on the circumferential C of the motor stator. The inlet 23 and outlet 24 are used to connect to the coolant circulation pump. Both ends of the stator cooling channel formed by the connection of the circumferential cooling channel and the axial cooling channel are connected to the coolant circulation pump, thereby forming a closed circulation channel. The coolant circulates between the stator cooling channel and the coolant circulation pump. The end ring 2 has no oil injection hole, and the end ring 2 does not leak or spray the coolant to the outside of the motor stator or the windings.

[0054] The inlet 23 and outlet 24 can both be located on the end ring 2 at one axial end of the motor stator, for example, the inlet 23 and outlet 24 can both be located on the first end ring 21. This facilitates the connection of the inlet 23 and outlet 24 to the coolant circulation pump.

[0055] Multiple inlets 23 and outlets 24 can be provided, for example, three inlets 23 and three outlets 24 can be provided. Multiple independent circulation channels (stator cooling channels) can be formed through multiple inlets 23 and outlets 24, so that the coolant in each circulation channel is used to cool a part of the motor stator, resulting in a better cooling effect.

[0056] like Figures 5 to 10 As shown, the end ring 2 may include a first end ring 21 and a second end ring 22. The first end ring 21 and the second end ring 22 are respectively disposed at both ends of the stator core 1 along the axial direction.

[0057] A first groove 211 can be provided on the surface of the first end ring 21 facing the stator core 1. Multiple first grooves 211 (e.g., 3) can be provided along the circumferential direction C of the first end ring 21. A second groove 221 can be provided on the surface of the second end ring 22 facing the stator core 1. Multiple second grooves 221 (e.g., 6) can be provided along the circumferential direction C of the second end ring 22. The first groove 211 and the second groove 221 can be arc-shaped, and the first groove 211 and the second groove 221 are connected by rivets 3.

[0058] On the circumferential direction C, the first groove 211 and the second groove 221 can be connected end to end. It can be understood that the first groove 211 and the second groove 221 are connected end to end in the circumferential direction. The first groove 211 and the second groove 221 are located at the first end ring 1 and the second end ring 2 respectively, so they are not directly connected.

[0059] Figures 3 to 6 The one-way arrow in the diagram indicates the direction of coolant flow.

[0060] The coolant pumped by the coolant circulation pump can flow through the inlet 23 and the hollow rivet 3 to one side of the second groove 221, then through the hollow rivet 3 on the other side of the second groove 221 to one side of the first groove 211, then through the hollow rivet 3 on the other side of the first groove 211 to one side of another second groove 221, and finally through the hollow rivet 3 on the other side of the other second groove 221 to the outlet 24, which then flows to the coolant circulation pump. This coolant circulation effectively removes heat from the motor stator, resulting in better cooling of the motor stator.

[0061] It is understood that the circulating coolant does not directly contact the motor stator, and the coolant can be water or an aqueous solution. Compared to oil, water or aqueous solutions have a higher specific heat capacity and better heat transfer capability. Therefore, the water-cooled motor using water or an aqueous solution as the coolant in this application exhibits better performance output continuity compared to an oil-cooled motor. Thus, with the same output performance, the water-cooled motor can be smaller and less expensive. Furthermore, the water pump has lower sealing requirements, and compared to an oil pump, the water pump is smaller and less expensive. Examples of aqueous solutions here include solutions of water and ethylene glycol.

[0062] like Figures 4 to 11 As shown, the stator core 1 may be provided with a stator core fixing hole 11, which can penetrate the stator core 1 along the axial direction A. The end ring 2 may be provided with an end ring fixing hole 25, which can penetrate the end ring 2 along the axial direction A. In the circumferential direction C, the end ring fixing hole 25 may be located at a position without the first groove 211 and the second groove 221. The stator core fixing hole 11 and the end ring fixing hole 25 are aligned in the circumferential direction C of the motor stator. Fasteners can pass through the stator core fixing hole 11 and the end ring fixing hole 25 to connect the end ring 2 to the stator core 1, and / or to fix the motor stator to the motor housing.

[0063] This application is not limited to the above embodiments. Those skilled in the art can make various modifications to the above embodiments of this application under the guidance of this application, without departing from the scope of this application. In addition, the following description is provided.

[0064] (1) In the above embodiment, the liquid inlet 23 and the liquid outlet 24 can be aligned with the position of the rivet 3, but this application is not limited to this. The liquid inlet and the liquid outlet can be located at the position of the first groove and the second groove, especially at the circumferential end position of the first groove and the second groove.

[0065] (2) In the above embodiments, each independent circulation channel (stator cooling channel) includes 4 axial cooling channels and 3 circumferential cooling channels, but this application is not limited to this, and the number of axial cooling channels and circumferential cooling channels can be selected as needed.

[0066] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0067] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0068] In this application, unless otherwise expressly stated or limited, terms such as "installation," "assembly," "connection," "linking," "joining," "linking," "abutment," "communication," "connection," "conduction," "fixing," and "fastening" should be interpreted broadly, for example, they can be direct or indirect. For instance, regarding connection, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly stated or limited. For instance, regarding communication / conduction, it can be direct communication / conduction or indirect communication / conduction through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0069] In this application, unless otherwise expressly stated or limited, a component being disposed / installed / located / enclosed / placed within, inside, or incorporated in another component can be either of the following two situations: a portion or a majority of the one component is located within the other component; or the one component is completely enclosed within the other component.

[0070] Although the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein. The present application can be modified and implemented as alternative embodiments without departing from the spirit and scope of the present application as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning for the present application.

Claims

1. A motor stator, characterized in that, include: The stator core includes multiple stacked stator laminations, and the stator core is provided with rivet holes that penetrate the stator core along the axial direction of the motor stator. An end ring is provided at both axial ends of the stator core. The surface of the end ring facing the stator core is provided with a groove extending circumferentially along the motor stator. The groove forms a circumferential cooling channel. The end ring is provided with a liquid inlet and a liquid outlet. as well as A rivet is disposed in the rivet hole and the rivet rivets and presses together multiple stator laminations. The rivet is hollow and forms an axial cooling channel. The axial cooling channel and the circumferential cooling channel are connected to form a stator cooling channel, in which coolant can circulate.

2. The motor stator according to claim 1, characterized in that, Both the liquid inlet and the liquid outlet are located on the end ring at one axial end of the motor stator.

3. The motor stator according to claim 1, characterized in that, The inlet and outlet are connected to the coolant circulation pump. Both ends of the stator cooling channel are connected to the coolant circulation pump, thereby forming a closed circulation channel. The end ring does not leak or spray the coolant to the outside of the motor stator or the windings.

4. The motor stator according to claim 1, characterized in that, The end ring includes a first end ring and a second end ring, which are respectively disposed at both ends of the stator core. The surface of the first end ring facing the stator core is provided with a first groove, and the surface of the second end ring facing the stator core is provided with a second groove. In the circumferential direction, the first groove and the second groove are connected end to end.

5. The motor stator according to claim 1, characterized in that, The stator core is provided with a stator core fixing hole, which penetrates the stator core along the axial direction. The end ring is provided with an end ring fixing hole, which penetrates the end ring along the axial direction. The stator core fixing hole and the end ring fixing hole are aligned in the circumferential direction of the motor stator.

6. The motor stator according to claim 1, characterized in that, The stator laminations are not axially fixed using welding, snap-fit, or fastening structures.

7. The motor stator according to claim 1, characterized in that, The stator laminations are axially pressed and fixed only by the rivets.

8. The motor stator according to claim 1, characterized in that, The motor stator is the stator of a dual-rotor motor. The motor stator includes a first stator and a second stator, the second stator being disposed radially outside the first stator. The first stator and the second stator share a stator core. The windings of the first stator and the windings of the second stator are both disposed on the stator core. In the radial direction of the motor stator, the stator cooling channel is located between the windings of the first stator and the windings of the second stator.

9. A water-cooled motor, characterized in that, The motor stator includes any one of claims 1 to 8, wherein the coolant is water or an aqueous solution.

10. A vehicle powertrain system, characterized in that, Includes the motor stator according to any one of claims 1 to 8, or the water-cooled motor according to claim 9.

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