Dual rotor electric machine
By setting a stator core support in a dual-rotor motor to form an axial cooling oil channel, the problems of poor cooling effect and electromagnetic interference are solved, achieving more efficient cooling and magnetic field decoupling.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SCHAEFFLER TECHNOLOGIES AG & CO KG
- Filing Date
- 2025-04-28
- Publication Date
- 2026-05-29
AI Technical Summary
The stator cooling effect of existing dual-rotor motors is not good, and the problem of mutual interference between stator electromagnetic fields has not been effectively solved.
A stator core support is installed between the inner stator core and the outer stator core to form cooling oil channels extending along the axial direction. The stator core support forms dense cooling oil channels on the outer circumferential surface of the inner stator core and the inner circumferential surface of the outer stator core. The cooling effect is improved by using oil collecting rings and oil spray holes, and magnetic field interference is avoided by using a stator core support made of non-magnetic material.
It achieves better cooling effect and magnetic field decoupling, increases the contact area between the oil and the stator core, improves cooling efficiency, and avoids mutual interference of stator electromagnetic fields.
Smart Images
Figure CN224305546U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle power unit technology, and in particular to a dual-rotor motor. Background Technology
[0002] For dual-rotor motors, through holes are usually provided in the stator core. These through holes are used for oil to pass through the stator core axially to cool the stator core, and also for connecting and fixing the stator core to the motor housing.
[0003] However, due to size limitations, the diameter of these through holes cannot be made very large. This results in a small contact area between the oil and the stator core, leading to mediocre cooling. Furthermore, these through holes cannot resolve the problem of mutual interference between the electromagnetic fields of the two stators in a dual-motor system.
[0004] CN220797948U discloses an electric motor, an electric power assembly, and a vehicle, wherein an axial oil passage is disposed between the stator and the housing.
[0005] CN109698574A discloses an electric motor in which an axial oil passage is located between the winding and the winding laminations. Utility Model Content
[0006] In order to overcome or mitigate the problems existing in the prior art, this application aims to propose a dual-rotor motor that provides better stator cooling.
[0007] This application discloses a dual-rotor motor, including a stator core and windings. The stator core includes an inner stator core, an outer stator core, and a stator core support. The outer stator core is disposed radially outside the inner stator core.
[0008] In the radial direction of the dual-rotor motor, the stator core support is disposed between the inner stator core and the outer stator core, and both the inner stator core and the outer stator core are connected to the stator core support.
[0009] A cooling oil passage extending axially along the dual-rotor motor is formed between the outer peripheral surface of the inner stator core and the inner peripheral surface of the stator core support, and / or, a cooling oil passage extending axially along the dual-rotor motor is formed between the inner peripheral surface of the outer stator core and the outer peripheral surface of the stator core support.
[0010] The cooling oil passage runs through the stator core.
[0011] In at least one possible implementation, the inner stator core is fixedly connected to the stator core support by a convex-concave fit on the inner circumferential surface, and a first cooling oil channel is formed between the outer circumferential protrusion of the inner stator core and the inner circumferential recess of the stator core support.
[0012] The outer stator core is fixedly connected to the outer peripheral surface of the stator core support by a convex-concave fit, and a second cooling oil channel is formed between the inner peripheral convex part of the outer stator core and the outer peripheral concave part of the stator core support.
[0013] In at least one possible implementation, the inner circumferential surface of the stator core support and / or the outer circumferential surface of the stator core support form a toothed structure with concave and convex shapes, wherein the teeth of the toothed structure are strips extending axially along the dual-rotor motor.
[0014] In at least one possible implementation, the toothed structure of the stator core support includes an inner circumferential recess, an inner circumferential protrusion, an outer circumferential recess, and an outer circumferential protrusion.
[0015] The inner circumferential recess of the stator core support is recessed radially outward on the inner circumferential surface of the stator core support, and the inner circumferential convex part of the stator core support protrudes radially inward on the inner circumferential surface of the stator core support. The outer circumferential recess of the stator core support is recessed radially inward on the outer circumferential surface of the stator core support, and the outer circumferential convex part of the stator core support protrudes radially outward on the outer circumferential surface of the stator core support.
[0016] In at least one possible implementation, the stator core support includes an axial extension extending circumferentially and axially along the dual-rotor motor and a radial extension extending circumferentially and radially along the dual-rotor motor, the radial extension being disposed at one axial end of the axial extension.
[0017] The inner circumferential recess, the inner circumferential convex portion, the outer circumferential recess, and the outer circumferential convex portion of the stator core support are located in the axial extension portion.
[0018] The radial extension extends radially inward from the axial extension and is provided with mounting holes. The stator core support is connected to the housing of the dual-rotor motor through the mounting holes.
[0019] In at least one possible implementation, the outer peripheral surface of the inner stator core and / or the inner peripheral surface of the outer stator core are provided with a stator yoke tooth structure with concave and convex shapes, wherein the teeth of the stator yoke tooth structure are strip-shaped extending along the axial direction of the dual-rotor motor.
[0020] On the outer circumferential surface of the inner stator core, the stator yoke tooth structure includes an inner stator protrusion and an inner stator recess, which are arranged alternately along the circumference of the dual-rotor motor.
[0021] On the inner circumferential surface of the outer stator core, the stator yoke tooth structure includes an outer stator protrusion and an outer stator recess, which are arranged alternately along the circumference of the dual-rotor motor.
[0022] In at least one possible implementation, the cooling oil passage includes a first cooling oil passage and a second cooling oil passage, the first cooling oil passage being located between the outer peripheral surface of the inner stator core and the inner peripheral surface of the stator core support, and the second cooling oil passage being located between the inner peripheral surface of the outer stator core and the outer peripheral surface of the stator core support.
[0023] In at least one possible implementation, there is a gap between the top of the teeth of the inner stator protrusion and the bottom of the groove of the inner peripheral recess of the stator core support, which forms the first cooling oil channel; and there is a gap between the top of the teeth of the outer stator protrusion and the bottom of the groove of the outer peripheral recess of the stator core support, which forms the second cooling oil channel.
[0024] In at least one possible embodiment, the dual-rotor motor further includes: a first oil collecting ring disposed at one axial end of the inner stator core and the outer stator core; and a second oil collecting ring disposed at the other axial end of the inner stator core and the outer stator core.
[0025] The first oil collecting ring forms a first annular oil cavity communicating with the cooling oil channel between the outer stator core and the axial extension portion, and the second oil collecting ring forms a second annular oil cavity communicating with the cooling oil channel between the inner stator core and the outer stator core.
[0026] In at least one possible implementation, the first oil collecting ring is provided with a plurality of oil injection holes for spraying oil onto the winding at the axial end of the outer stator core, and the portion of the axial extension defining the first annular oil cavity is provided with a plurality of oil injection holes for spraying oil onto the winding at the axial end of the inner stator core.
[0027] In at least one possible implementation, the second oil collecting ring is provided with a plurality of oil spray holes for spraying oil onto the winding at the axial end of the inner stator core, and a plurality of oil spray holes for spraying oil onto the winding at the axial end of the outer stator core.
[0028] By adopting the above technical solution, cooling oil channels are formed on the outer circumferential surface of the inner stator core and / or the inner circumferential surface of the outer stator core through the stator core support. The cooling channels can be arranged densely, so the cooling effect is better. Attached Figure Description
[0029] Figure 1 A schematic diagram of the stator structure of a dual-rotor motor according to an embodiment of this application is shown.
[0030] Figure 2 A structural schematic diagram of the stator of a dual-rotor motor according to an embodiment of this application is shown from another angle.
[0031] Figure 3 A cross-sectional perspective view of the stator of a dual-rotor motor according to an embodiment of this application is shown.
[0032] Figure 4 A schematic diagram of the structure of the inner stator core, outer stator core, and stator core support in the stator of a dual-rotor motor according to an embodiment of this application is shown.
[0033] Figure 5 It shows Figure 4 A magnified view of a portion of the image.
[0034] Figure 6 A schematic diagram of the stator structure of a dual-rotor motor according to an embodiment of this application is shown.
[0035] Figure 7 A schematic diagram of the stator core support of a dual-rotor motor according to an embodiment of this application is shown.
[0036] Figure 8 A structural schematic diagram of the stator core support of a dual-rotor motor according to an embodiment of this application is shown from another angle.
[0037] Explanation of reference numerals in the attached figures
[0038] 1 Inner stator core 11 Inner stator convex part 12 Inner stator concave part
[0039] 2. Outer stator core; 21. Outer stator protrusion; 22. Outer stator recess.
[0040] 3. Stator core support 31. Toothed structure of the support 32. Inner circumferential recess of the stator core support 321. Opening 33. Inner circumferential protrusion of the stator core support 34. Outer circumferential recess of the stator core support 35. Outer circumferential protrusion of the stator core support protruding radially outward 36. Axial extension 37. Radial extension 371. Mounting hole
[0041] 4. First oil ring 41 Oil inlet
[0042] 5. Second oil ring; 51. Injection hole
[0043] 6. Inner stator winding
[0044] 7. External stator winding
[0045] L1 is the first cooling oil passage, and L2 is the second cooling oil passage.
[0046] A-axis and C-circumferential direction Detailed Implementation
[0047] 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.
[0048] like Figures 1 to 7 As shown, an embodiment of this application proposes a dual-rotor motor, which includes a stator and a rotor, the rotor being rotatable relative to the stator. The dual-rotor motor includes a first motor unit and a second motor unit. The first motor unit includes an inner stator and an inner rotor. The inner stator may include an inner stator core 1 and an inner stator winding 6. The second motor unit includes an outer stator and an outer rotor. The outer stator may include an outer stator core 2 and an outer stator winding 7.
[0049] The inner stator winding 6 can be installed on the inner stator core 1, and the outer stator winding 7 can be installed on the outer stator core 2. The two axial ends of the inner stator winding 6 can protrude from the inner stator core 1, and the two axial ends of the outer stator winding 7 can protrude from the outer stator core 2. The portions of the inner stator winding 6 that protrude from the inner stator core 1 and the portions of the outer stator winding 7 that protrude from the outer stator core 2 can be referred to as end windings.
[0050] The stator may include a stator core and windings. The stator core may include an inner stator core 1, an outer stator core 2, and a stator core support 3. The outer stator core 2 may be located radially outside the inner stator core 1. The rotor may include an inner rotor and an outer rotor. The inner rotor may be located radially inside the inner stator core 1, and the outer rotor may be located radially outside the outer stator core 2.
[0051] like Figure 4 and Figure 5 As shown, in the radial direction of the dual-rotor motor, the stator core support 3 can be disposed between the inner stator core 1 and the outer stator core 2, and both the inner stator core 1 and the outer stator core 2 are connected to the stator core support 3. The inner stator core 1 can be connected to the stator core support 3 by interference fit, and the outer stator core 2 can be connected to the stator core support 3 by interference fit.
[0052] A cooling oil channel L extending along the axial direction A of the dual-rotor motor is formed between the outer peripheral surface of the inner stator core 1 and the inner peripheral surface of the stator core support 3, and / or, a cooling oil channel L extending along the axial direction A of the dual-rotor motor is formed between the inner peripheral surface of the outer stator core 2 and the outer peripheral surface of the stator core support 3. The cooling oil channel L penetrates the stator core. The cross-section of the cooling oil channel L can be rectangular.
[0053] The cooling oil passage L may include a first cooling oil passage L1 and a second cooling oil passage L2. The first cooling oil passage L1 may be located between the outer peripheral surface of the inner stator core 1 and the inner peripheral surface of the stator core support 3. The second cooling oil passage L2 may be located between the inner peripheral surface of the outer stator core 2 and the outer peripheral surface of the stator core support 3.
[0054] like Figure 3 , Figure 5 and Figure 7 As shown, the stator core support 3 may include an axial extension 36 and a radial extension 37. The axial extension 36 may extend along the circumferential direction C and the axial direction A of the dual-rotor motor, and the radial extension 37 may extend along the circumferential direction C and the radial direction of the dual-rotor motor. The radial extension 37 may be disposed at one axial end of the axial extension 36, and the radial extension 37 may extend radially inward from the axial extension 36.
[0055] The radial extension 37 may be provided with mounting holes 371, and the stator core bracket 3 may be connected to the housing of the dual rotor motor through the mounting holes 371 and bolts or rivets.
[0056] The inner circumferential surface and / or the outer circumferential surface of the stator core support 3 can form a concave-convex support tooth structure 31, and the teeth of the support tooth structure 31 can be strips extending along the axial direction A of the dual rotor motor. Multiple teeth of the support tooth structure 31 can be arranged along the circumferential direction C of the dual rotor motor.
[0057] On the inner circumferential surface of the stator core support 3, the recessed portion of the support tooth structure 31 can form a first cooling oil channel L1 with the outer circumferential surface of the inner stator core 1. On the outer circumferential surface of the stator core support 3, the recessed portion of the support tooth structure 31 can form a second cooling oil channel L2 with the inner circumferential surface of the outer stator core 2. When the oil flows through the first cooling oil channel L1 and the second cooling oil channel L2, the oil can carry away the heat from the inner stator core 1 and the outer stator core 2.
[0058] Reference Figure 7 In one possible implementation, both the inner and outer peripheral surfaces of the stator core support 3 are formed with concave-convex support tooth structures 31. The inner peripheral surface of the stator core support 3 may form a radially outward recessed inner peripheral portion 32 and a radially inward protruding inner peripheral portion 33. The outer peripheral surface of the stator core support 3 may form a radially inward recessed outer peripheral portion 34 and a radially outward protruding outer peripheral portion 35. The inner peripheral recess 32 and the outer peripheral protrusion 35 may be located on the same radially inner and outer sides of the stator core support 3. The inner peripheral protrusion 33 and the outer peripheral recess 34 may also be located on the same radially inner and outer sides of the stator core support 3.
[0059] Optionally, the stator core support 3 can be manufactured using a stamping process. The support tooth structure 31 on the inner and outer circumferential surfaces of the stator core support 3 is formed by stamping, resulting in lower production costs.
[0060] Reference Figures 4 to 6 Optionally, the outer peripheral surface of the inner stator core 1 and / or the inner peripheral surface of the outer stator core 2 may be provided with a stator yoke tooth structure with concave and convex shapes. The teeth of the stator yoke tooth structure may be strips extending along the axial direction A of the dual-rotor motor. On the outer peripheral surface of the inner stator core 1, the stator yoke tooth structure may include an inner stator protrusion 11 and an inner stator recess 12, which may be alternately arranged along the circumferential direction C. On the inner peripheral surface of the outer stator core 2, the stator yoke tooth structure may include an outer stator protrusion 21 and an outer stator recess 22, which may be alternately arranged along the circumferential direction C.
[0061] The inner stator protrusion 11 and the outer stator recess 22 can be arranged opposite to each other, and the inner stator recess 12 and the outer stator protrusion 21 can be arranged opposite to each other.
[0062] The inner circumferential protrusion 33 of the stator core support can be inserted into the inner stator recess 12, thereby fixing the inner stator core 1 and the stator core support 3 in the circumferential direction C. The outer circumferential protrusion 35 of the stator core support can be inserted into the outer stator recess 22, thereby fixing the outer stator core 2 and the stator core support 3 in the circumferential direction C.
[0063] In one possible implementation, a gap exists between the top of the teeth of the inner stator protrusion 11 and the bottom of the groove of the inner circumferential recess 32 of the stator core support, forming a first cooling oil channel L1. Oil flowing through the first cooling oil channel can directly contact the inner stator core 1, thereby cooling the inner stator. A gap exists between the top of the teeth of the outer stator protrusion 21 and the bottom of the groove of the outer circumferential recess 34 of the stator core support, forming a second cooling oil channel L2. Oil flowing through the second cooling oil channel L2 can directly contact the outer stator core 2, thereby cooling the outer stator. The top of the teeth of the outer circumferential protrusion 35 of the stator core support can contact the bottom of the groove of the outer stator recess 22. The top of the teeth of the inner circumferential protrusion 33 of the stator core support can contact the bottom of the groove of the inner stator recess 12.
[0064] The stator core support 3 can be made of a non-magnetic material, such as steel or stainless steel. The stator core support 3 can decouple the magnetic fields of the first motor unit and the second motor unit, avoiding mutual interference.
[0065] The first cooling oil channel L1 and the second cooling oil channel L2 can be arranged relatively close together without affecting the strength of the stator core and the magnetic field of the two motor units. As a result, the contact area between the oil and the stator core is large, and the cooling effect is better.
[0066] In another possible implementation, the top of the teeth of the inner circumferential protrusion 33 of the stator core support and the bottom of the groove of the inner stator recess 12 may have a gap, which forms a first cooling oil passage L1. The top of the teeth of the outer circumferential protrusion 35 of the stator core support and the bottom of the groove of the outer stator recess 22 may have a gap, which forms a second cooling oil passage L2. The top of the teeth of the inner stator protrusion 11 and the bottom of the groove of the inner circumferential recess 32 of the stator core support may contact each other, and the top of the teeth of the outer stator protrusion 21 and the bottom of the groove of the outer circumferential recess 34 of the stator core support may contact each other.
[0067] In another possible embodiment, the top of the teeth of the inner peripheral protrusion 33 of the stator core support and the bottom of the groove of the inner stator recess 12 may have a gap, and the top of the teeth of the inner stator protrusion 11 and the bottom of the groove of the inner peripheral recess 32 of the stator core support may have a gap, which constitutes a first cooling oil passage L1. The top of the teeth of the outer peripheral protrusion 35 of the stator core support and the bottom of the groove of the outer stator recess 22 may have a gap, and the top of the teeth of the outer stator protrusion 21 and the bottom of the groove of the outer peripheral recess 34 of the stator core support may have a gap, which constitutes a second cooling oil passage L2.
[0068] The first oil collecting ring 4 and the second oil collecting ring 5 can be respectively disposed at both ends of the inner stator core 1 and the outer stator core 2, and form annular oil cavities at both ends of the cooling oil channel L, the annular oil cavities being connected to the cooling oil channel L. The first oil collecting ring 4 forms a first annular oil cavity connected to the cooling oil channel L between the outer stator core 2 and the axial extension 36, and the second oil collecting ring 5 forms a second annular oil cavity connected to the cooling oil channel L between the inner stator core 1 and the outer stator core 2.
[0069] Reference Figure 3 and Figure 8 It can be understood that the axial end of the inner circumferential recess 32 of the stator core support and the main body of the axial extension 36 are separated, or an opening 321 is formed at the axial end of the inner circumferential recess 32 of the stator core support, so that the first cooling oil passage L1 and the first annular oil cavity are connected.
[0070] The first oil collecting ring 4 may be provided with an oil inlet hole 41, and the first oil collecting ring 4 and / or the second oil collecting ring 5 may be provided with multiple oil spray holes 51. The oil spray holes 51 may include oil spray holes facing radially outward and oil spray holes facing radially inward. Oil can enter the first annular oil cavity at one end of the axial direction through the oil inlet hole 41, and then flow along the first cooling oil channel L1 and the second cooling oil channel L2 to the second annular oil cavity at the other end of the axial direction. Oil can be sprayed onto the end windings of the inner stator winding 6 and the outer stator winding 7 through the oil spray holes 51, thereby cooling the windings.
[0071] The axial section of the first oil collecting ring 4 can be L-shaped. The first oil collecting ring 4 can be set on the radial outer side of the axial extension 36 of the stator core support 3. The first oil collecting ring 4 can be press-fitted with the axial extension 36 to form a seal, or the first oil collecting ring 4 can be bonded to the end of the axial extension 36 and the outer stator core 2 to form a seal.
[0072] Optionally, the first oil collecting ring 4 is provided with a plurality of oil spray holes for spraying oil onto the end winding of the outer stator core 2, and the portion of the axial extension 36 that defines the first annular oil cavity is provided with a plurality of oil spray holes for spraying oil onto the end winding of the inner stator core 1.
[0073] The axial section of the second oil collecting ring 5 can be U-shaped. The second oil collecting ring 5 can be installed at the ends of the inner stator core 1 and the outer stator core 2 by means of a connecting structure such as a pin, or the second oil collecting ring 5 can be bonded to the ends of the inner stator core 1 and the outer stator core 2.
[0074] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.
[0075] 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.
[0076] 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.
[0077] 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.
[0078] 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 dual-rotor motor, comprising a stator core and windings, characterized in that, The stator core includes an inner stator core, an outer stator core, and a stator core support, wherein the outer stator core is disposed radially outside the inner stator core. In the radial direction of the dual-rotor motor, the stator core support is disposed between the inner stator core and the outer stator core, and both the inner stator core and the outer stator core are connected to the stator core support. A cooling oil passage extending axially along the dual-rotor motor is formed between the outer peripheral surface of the inner stator core and the inner peripheral surface of the stator core support, and / or, a cooling oil passage extending axially along the dual-rotor motor is formed between the inner peripheral surface of the outer stator core and the outer peripheral surface of the stator core support. The cooling oil passage runs through the stator core.
2. The dual-rotor motor according to claim 1, characterized in that, The inner stator core is fixedly connected to the stator core support by a convex-concave fit on the inner circumferential surface, and a first cooling oil channel is formed between the outer circumferential protrusion of the inner stator core and the inner circumferential concave portion of the stator core support. The outer stator core is fixedly connected to the outer peripheral surface of the stator core support by a convex-concave fit, and a second cooling oil channel is formed between the inner peripheral convex part of the outer stator core and the outer peripheral concave part of the stator core support.
3. The dual-rotor motor according to claim 1, characterized in that, The inner circumferential surface of the stator core support and / or the outer circumferential surface of the stator core support form a concave-convex support tooth structure, wherein the teeth of the support tooth structure are strips extending along the axial direction of the dual rotor motor.
4. The dual-rotor motor according to claim 3, characterized in that, The toothed structure of the stator core support includes an inner circumferential concave portion, an inner circumferential convex portion, an outer circumferential concave portion, and an outer circumferential convex portion. The inner circumferential recess of the stator core support is recessed radially outward on the inner circumferential surface of the stator core support, and the inner circumferential convex part of the stator core support protrudes radially inward on the inner circumferential surface of the stator core support. The outer circumferential recess of the stator core support is recessed radially inward on the outer circumferential surface of the stator core support, and the outer circumferential convex part of the stator core support protrudes radially outward on the outer circumferential surface of the stator core support.
5. The dual-rotor motor according to claim 4, characterized in that, The stator core support includes an axial extension portion extending circumferentially and axially along the dual-rotor motor, and a radial extension portion extending circumferentially and radially along the dual-rotor motor. The radial extension portion is disposed at one axial end of the axial extension portion. The inner circumferential recess, the inner circumferential convex portion, the outer circumferential recess, and the outer circumferential convex portion of the stator core support are located in the axial extension portion. The radial extension extends radially inward from the axial extension and is provided with mounting holes. The stator core support is connected to the housing of the dual-rotor motor through the mounting holes.
6. The dual-rotor motor according to claim 4, characterized in that, The outer circumferential surface of the inner stator core and / or the inner circumferential surface of the outer stator core are provided with a stator yoke tooth structure with concave and convex shapes. The teeth of the stator yoke tooth structure are strips extending along the axial direction of the dual-rotor motor. On the outer circumferential surface of the inner stator core, the stator yoke tooth structure includes an inner stator protrusion and an inner stator recess, which are arranged alternately along the circumference of the dual-rotor motor. On the inner circumferential surface of the outer stator core, the stator yoke tooth structure includes an outer stator protrusion and an outer stator recess, which are arranged alternately along the circumference of the dual-rotor motor.
7. The dual-rotor motor according to claim 6, characterized in that, The cooling oil passage includes a first cooling oil passage and a second cooling oil passage. The first cooling oil passage is located between the outer peripheral surface of the inner stator core and the inner peripheral surface of the stator core support, and the second cooling oil passage is located between the inner peripheral surface of the outer stator core and the outer peripheral surface of the stator core support.
8. The dual-rotor motor according to claim 7, characterized in that, There is a gap between the top of the teeth of the inner stator protrusion and the bottom of the groove of the inner circumferential recess of the stator core support, which forms the first cooling oil channel. There is also a gap between the top of the teeth of the outer stator protrusion and the bottom of the groove of the outer circumferential recess of the stator core support, which forms the second cooling oil channel.
9. The dual-rotor motor according to claim 5, characterized in that, The dual-rotor motor further includes: a first oil collecting ring disposed at one axial end of the inner stator core and the outer stator core; and a second oil collecting ring disposed at the other axial end of the inner stator core and the outer stator core. The first oil collecting ring forms a first annular oil cavity communicating with the cooling oil channel between the outer stator core and the axial extension portion, and the second oil collecting ring forms a second annular oil cavity communicating with the cooling oil channel between the inner stator core and the outer stator core.
10. The dual-rotor motor according to claim 9, characterized in that, The first oil collecting ring is provided with a plurality of oil spray holes for spraying oil onto the winding at the axial end of the outer stator core, and the portion of the axial extension that defines the first annular oil cavity is provided with a plurality of oil spray holes for spraying oil onto the winding at the axial end of the inner stator core.
11. The dual-rotor motor according to claim 9, characterized in that, The second oil collecting ring is provided with a plurality of oil spray holes for spraying oil onto the winding at the axial end of the inner stator core, and a plurality of oil spray holes for spraying oil onto the winding at the axial end of the outer stator core.