Double-rotor motor and vehicle power system

Abstract

The utility model provides a dual-rotor motor and a vehicle power system, and the dual-rotor motor comprises a first motor unit which comprises a first stator and an inner rotor; the second motor unit is arranged on the radial outer side of the first motor unit, the second motor unit comprises a second stator and an outer rotor, and the outer rotor is provided with an outer rotor cooling channel penetrating through the outer rotor in the axial direction of the double-rotor motor; the oil guide plate is arranged on one axial side of the second stator, the oil guide plate is connected to the outer rotor, the oil guide plate comprises an oil guide plate base part and a plurality of oil guide parts, the oil guide plate base part is in a circular ring shape, the oil guide parts are connected to the periphery of the oil guide plate base part, the oil guide parts extend from the oil guide plate base part to the other axial side, and the oil guide parts are connected to the oil guide plate base part. The plurality of oil guide parts are arranged in the circumferential direction of the oil guide plate at intervals, a notch is formed between every two adjacent oil guide parts, oil liquid passing through the oil guide parts can be guided to the second stator, and the oil liquid passing through the notches can flow to the outer rotor cooling channel.

Description

Technical Field

[0001] This application belongs to the field of electric drive vehicles, and specifically relates to a dual rotor motor and a vehicle power system. Background Technology

[0002] Pure electric vehicles and hybrid electric vehicles typically use permanent magnet synchronous motors (PMSMs). Cooling the rotor of a PMSM is crucial, as efficient cooling can prevent demagnetization and make the PMSM more reliable under high-speed and high-load conditions.

[0003] Rotor cooling methods include oil jet cooling, air cooling, and shaft cooling. Oil jet cooling involves directly spraying oil onto the rotor as the cooling medium to cool the rotor's heat-generating areas (such as permanent magnets and the rotor shaft). Air cooling involves dissipating heat from the rotor through air circulation as it rotates. Shaft cooling involves coolant flowing through the hollow channels of the rotor shaft, thereby carrying away the rotor's heat.

[0004] like Figure 1 As shown, a possible dual-rotor motor includes a first motor unit 1 and a second motor unit 2, with the second motor unit 2 disposed radially outside the first motor unit 1. The first motor unit 1 includes a first stator 11, an inner rotor shaft 12, and an inner rotor 13. The second motor unit 2 includes a second stator 21, an outer rotor shaft 22, an outer rotor 23, and an outer rotor support 24. Figure 1 The one-way arrow in the diagram indicates the direction of oil flow.

[0005] The oil can flow through a guide to the windings of the second stator 21, and then to the end face of the outer rotor 23 to provide cooling for the second motor unit 2. However, the oil cannot pass through the interior of the outer rotor 23, resulting in low cooling efficiency. This affects the continuous high-power output of the motor and may even lead to demagnetization, reducing motor performance and lifespan. Utility Model Content

[0006] This application aims to provide a dual-rotor motor that improves cooling performance and enhances motor performance.

[0007] This application provides a dual-rotor motor, comprising:

[0008] A first motor unit, comprising a first stator and an inner rotor, wherein the inner rotor is disposed radially inside the first stator;

[0009] a second motor unit disposed radially outward of the first motor unit, the second motor unit including a second stator and an outer rotor disposed radially outward of the second stator, the outer rotor having an outer rotor cooling passage extending through the outer rotor in an axial direction of the dual rotor motor; and

[0010] an oil guide plate disposed on an axial one side of the second stator, the oil guide plate connected to the outer rotor,

[0011] the oil guide plate including an oil guide plate base portion in a circular ring shape and a plurality of oil guide portions connected to an outer periphery of the oil guide plate base portion, the oil guide portions extending from the oil guide plate base portion toward an axial other side, the plurality of oil guide portions arranged at intervals in a circumferential direction of the oil guide plate, a gap being formed between two adjacent oil guide portions,

[0012] oil guided through the oil guide portions being able to be guided to the second stator, and oil guided through the gap being able to flow to the outer rotor cooling passage.

[0013] In at least one possible implementation, the oil guide portions are inclined with respect to the axial direction, the further the oil guide portions are from the oil guide plate base portion, the more the oil guide portions extend radially outward.

[0014] In at least one possible implementation, as viewed in a radial direction of the dual rotor motor, the oil guide portions overlap with a winding portion of the second stator, the oil guide portions being located radially inward of the winding of the second stator.

[0015] In at least one possible implementation, the outer rotor includes a rotor core and permanent magnets, the rotor core being provided with magnet mounting holes extending through the rotor core in the axial direction, the permanent magnets being mounted to the magnet mounting holes, at least one gap being present between the permanent magnets and inner walls of the magnet mounting holes, the gap forming the outer rotor cooling passage.

[0016] In at least one possible implementation, the magnet mounting holes are V-shaped as a whole, an opening of the V-shape facing radially inward, both ends and a middle of the V-shape each forming the outer rotor cooling passage.

[0017] In at least one possible implementation, the second motor unit further includes an outer rotor support, the outer rotor support including a disc-shaped portion and a cylindrical portion, the disc-shaped portion extending in a radial direction and a circumferential direction of the dual rotor motor, the cylindrical portion extending in an axial direction and a circumferential direction of the dual rotor motor, the disc-shaped portion connected to the cylindrical portion, the outer rotor connected to an inner peripheral surface of the cylindrical portion, the disc-shaped portion being located on an axial one side of the second stator, oil guided through the gap being able to be guided to the outer rotor cooling passage via the outer rotor support.

[0018] In at least one possible implementation, the outer rotor support further comprises an oil guide portion, which is arranged between the disc portion and the cylindrical portion, and which comprises a guide surface that is inclined with respect to the disc portion and inclined with respect to the cylindrical portion.

[0019] In at least one possible implementation, the dual-rotor motor further comprises a clutch, and the inner rotor and the outer rotor are connected through the clutch, and the inner rotor and the outer rotor are able to rotate together or separately by transmitting torque between each other through combination or separation of the clutch.

[0020] In at least one possible implementation, the first motor unit further comprises an inner rotor shaft, and the inner rotor is connected to the inner rotor shaft, and the inner rotor shaft is a hollow shaft, and the inner rotor shaft is provided with an oil hole that penetrates a peripheral wall of the inner rotor shaft, and the inner rotor shaft is provided with the oil hole at least at a position radially inside the clutch in an axial direction of the inner rotor shaft.

[0021] The embodiments of the present application also propose a vehicle power system comprising the dual-rotor motor according to any one of the above technical solutions.

[0022] By using the above technical solution, a part of the oil flows to the windings of the second motor along the oil guide portion of the oil guide plate, and another part of the oil flows to the outer rotor cooling channel from the gap, and passes through the outer rotor, and the cooling effect of the motor is better. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A partial structural schematic diagram of a possible dual-rotor motor is shown.

[0024] Figure 2 A partial structural schematic diagram of a vehicle power system according to an embodiment of the present application is shown.

[0025] Figure 3 A partial structural schematic diagram of a dual-rotor motor of a vehicle power system according to an embodiment of the present application is shown.

[0026] Figure 4 A structural schematic diagram of an oil guide plate of a dual-rotor motor according to an embodiment of the present application is shown.

[0027] Figure 5 Another angle of a structural schematic diagram of an oil guide plate of a dual-rotor motor according to an embodiment of the present application is shown.

[0028] Figure 6 A cross-sectional schematic diagram of an outer rotor of a dual-rotor motor according to an embodiment of the present application is shown.

[0029] Reference Signs List

[0030] 1 first motor unit 11 first stator 12 inner rotor shaft 13 inner rotor

[0031] 2 second motor unit 21 second stator 22 outer rotor shaft

[0032] 23 outer rotor 231 rotor core 232 permanent magnet 233 outer rotor cooling passage

[0033] 24 outer rotor support 241 disc-shaped portion 242 cylindrical portion 243 oil guide surface

[0034] 3 oil guide plate 31 oil guide plate base 32 oil guide portion 33 notch

[0035] 4 clutch

[0036] 5 motor housing

[0037] A axial C circumferential R radial. DETAILED DESCRIPTION

[0038] In order to more clearly illustrate the above and other features and advantages of the present application, a more particular description of the application will be rendered by reference to specific embodiments thereof, which are illustrated in the appended drawings. The various embodiments presented are not necessarily the only ones in which the application can be practiced. The general principles defined herein can be applied to other embodiments, implementations, and applications without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the particular embodiments described by this part, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0039] As shown in Figures 2 to 6 the embodiments of the present application propose a vehicle power system, which can include a dual-rotor motor.

[0040] The dual-rotor motor includes a first motor unit 1, a second motor unit 2, an oil guide plate 3, a clutch 4, and a motor housing 5. The first motor unit 1, the second motor unit 2, the oil guide plate 3, and the clutch 4 are all arranged inside the motor housing 5, and the second motor unit 2 can be arranged radially outward of the first motor unit 1.

[0041] The first motor unit 1 includes a first stator 11, an inner rotor shaft 12, and an inner rotor 13. The first stator 11 can be fixedly connected to the motor housing 5, and the first stator 11 is installed with first motor windings 111 that protrude from both axial ends of the first stator 11. The inner rotor shaft 12 is rotatably installed in the motor housing 5, and the inner rotor 13 is connected to the inner rotor shaft 12. The inner rotor 13 can be arranged radially inward of the first stator 11, and the inner rotor 13 can rotate relative to the first stator 11.

[0042] The second motor unit 2 comprises a second stator 21, an outer rotor shaft 22, an outer rotor 23 and an outer rotor support 24. The second stator 21 can be fixedly connected to the motor housing 5, and the second stator 21 is installed with second motor windings 211 protruding from both axial ends of the second stator 21. The outer rotor shaft 22 is rotatably installed on the motor housing 5, and the outer rotor 23 is connected to the outer rotor shaft 22. The outer rotor 23 can be arranged radially outward of the second stator 21, and the outer rotor 23 can rotate relative to the second stator 21.

[0043] As shown in Figure 6 , the outer rotor 23 comprises a rotor core 231 and permanent magnets 232. The rotor core 231 can be provided with magnet mounting holes penetrating the rotor core 231 along the axial direction A of the outer rotor 23, and the permanent magnets 232 can be mounted in the magnet mounting holes. There is at least one gap between the permanent magnets 232 and the inner wall of the magnet mounting hole, which forms an outer rotor cooling channel 233 penetrating the outer rotor 23 along the axial direction A. A plurality of groups of permanent magnets 232 and outer rotor cooling channels 233 can be arranged along the circumferential direction C of the outer rotor 23.

[0044] Further, the magnet mounting hole as a whole can be V-shaped, and the opening of the V-shaped can face the radially inner side of the motor. Both ends and the middle of the V-shaped can form outer rotor cooling channels 233.

[0045] Further, the outer rotor shaft 22 can be located on one axial side of the outer rotor 23 (right side in Figure 2 ), and the outer rotor 23 can be connected to the outer rotor shaft 22 through the outer rotor support 24. The outer rotor shaft 22 can be arranged radially outward of the inner rotor shaft 12.

[0046] The inner rotor shaft 12 (or inner rotor) and the outer rotor shaft 22 (or outer rotor) can be connected through the clutch 4. The clutch 4 can be combined or separated to make the inner rotor shaft 12 (or inner rotor) and the outer rotor shaft 22 (or outer rotor) rotate together or separately.

[0047] The inner rotor shaft 12 can be a hollow shaft, and the peripheral wall of the inner rotor shaft 12 can be provided with oil holes penetrating the peripheral wall of the inner rotor shaft 12. In the axial direction A of the inner rotor shaft 12, at least at a radially inner side position of the clutch 4, the inner rotor shaft 12 can be provided with oil holes. The oil flowing through the inside of the inner rotor shaft 12 can flow to the clutch 4 through the oil holes to cool the clutch 4.

[0048] As shown in Figures 2 to 5 , the oil guide plate 3 can be fixedly connected to the outer rotor shaft 22, and the oil guide plate 3 can be arranged on one axial side of the first stator 11 and / or the second stator 21 (right side in Figure 2 ).

[0049] AsFigure 4 and Figure 5 As shown in FIGS. 1 1 and 12, the oil guide plate 3 includes an oil guide plate base 31 and an oil guide portion 32. The oil guide plate base 31 can be circular ring-shaped, and oil can flow circumferentially C and radially R on the surface of the oil guide plate base 31. The oil guide portion 32 can be provided in plurality, and the plurality of oil guide portions 32 can be connected to the outer circumferential portion of the oil guide plate base 31, and the oil guide portion 32 extends from the oil guide plate base 31 to the second stator 21. The oil guide portion 32 can be located radially outward of the clutch 4, and the oil passing through the clutch 4 can be guided to the second motor winding 211 by the oil guide portion 32. The oil guide plate base 31 can be provided with a plurality of mounting holes, and the oil guide plate 3 can be connected to the outer rotor shaft 22 by fasteners passing through the mounting holes.

[0050] The oil guide portion 32 can be located radially inward of the second motor winding 211 of the second stator 21. The oil guide portion 32 can be inclined with respect to the axial direction A, and the farther the oil guide portion 32 is from the oil guide plate base 31, the farther the oil guide portion 32 extends radially outward. The plurality of oil guide portions 32 can be arranged at intervals along the circumferential direction C of the oil guide plate base 31, and a gap 33 can be formed between two adjacent oil guide portions 32. In this way, a portion of the oil can flow along the oil guide portion 32 to the second motor winding 211, and another portion of the oil can flow from the gap 33 to the outer rotor support 24.

[0051] As viewed in the radial direction R of the dual rotor motor, the oil guide portion 32 partially overlaps the winding (second motor winding 211) of the second stator 21, and the oil guide portion 32 and the winding (second motor winding 211) of the second stator 21 can occupy the same axial position. The oil guide portion 32 is located radially inward of the winding (second motor winding 211) of the second stator 21.

[0052] The oil guide plate base 31 and the oil guide portion 32 can be integrally formed, for example, by stamping to form the oil guide plate 3.

[0053] As shown in FIGS. 13 and 14, the outer rotor support 24 can include a disc-shaped portion 241 and a cylindrical portion 242. The disc-shaped portion 241 can extend in the radial direction R and the circumferential direction C of the motor, and the cylindrical portion 242 can extend in the axial direction A and the circumferential direction C of the motor. The disc-shaped portion 241 can be connected to the cylindrical portion 242, the outer rotor 23 can be connected to the inner circumferential surface of the cylindrical portion 242, and the disc-shaped portion 241 can be located on the axial side (right side in FIGS. 13 and 14) of the second stator 21. Figure 2 Figure 3 The outer rotor support 24 further includes an oil guide portion 243, which can be provided between the disc-shaped portion 241 and the cylindrical portion 242. The oil guide portion 243 can include a guide surface that is inclined with respect to the disc-shaped portion 241 and inclined with respect to the cylindrical portion 242. Figure 2 Figure 3 The disc-shaped portion 241 can be connected to the cylindrical portion 242, the outer rotor 23 can be connected to the inner circumferential surface of the cylindrical portion 242, and the disc-shaped portion 241 can be located on the axial side (right side in FIGS. 13 and 14) of the second stator 21.

[0054] The outer rotor support 24 further includes an oil guide portion 243, which can be provided between the disc-shaped portion 241 and the cylindrical portion 242. The oil guide portion 243 can include a guide surface that is inclined with respect to the disc-shaped portion 241 and inclined with respect to the cylindrical portion 242.

[0055] ​​The oil can be guided along the disc-shaped part 241 and the oil guide part 243 to the outer rotor cooling channel 233, so that the oil passes through the outer rotor 23 and directly cools the outer rotor 23, thus achieving a better cooling effect.

[0056] Figure 2 and Figure 3 The one-way arrow in the diagram indicates the direction of oil flow. (Refer to...) Figure 2 and Figure 3 The oil flow circulation path is described. The oil is pumped into the inner rotor shaft 12, then flows out of the inner rotor shaft 12 through the oil hole, flows through the clutch 4, and is guided by the oil guide plate 3 to the axial side of the second motor winding 211. Figure 2 (right side of the image) and outer rotor support 24. The outer rotor support 24 guides the oil to the outer rotor cooling channel 233, through which it flows to the other axial side of the second motor winding 211 (…). Figure 2 (On the left side of the middle), the oil can directly contact the stator and rotor of the second motor unit 2 and form a circulation through the second stator 21, which has a better cooling effect on the second motor unit 2.

[0057] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0058] 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.

[0059] 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.

[0060] In the present application, unless specifically stated or limited otherwise, a component is disposed in / installed in / located in / contained in / placed in another component, etc. can be either of the following two cases: a part or most of the component is located in the other component; and the component is completely contained in the other component.

[0061] Although the present application has been described in detail above with reference to the embodiments, it is apparent to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified in various ways without departing from the spirit and scope of the present application as defined by the claims, and can be implemented as modified embodiments. Therefore, the description in the present specification is intended for the purpose of illustration only, and does not have any restrictive meaning on the present application.

Claims

1. A dual rotor electric machine characterized by, The double rotor motor includes: a first motor unit including a first stator and an inner rotor provided radially inside the first stator; a second motor unit provided radially outside the first motor unit, the second motor unit including a second stator and an outer rotor provided radially outside the second stator, the outer rotor having an outer rotor cooling passage extending through the outer rotor in an axial direction of the double rotor motor; and an oil guide plate provided on one axial side of the second stator, the oil guide plate being connected to the outer rotor, the oil guide plate including an oil guide plate base portion in a circular ring shape and a plurality of oil guide portions connected to an outer periphery of the oil guide plate base portion, the oil guide portions extending from the oil guide plate base portion toward the other axial side, the plurality of oil guide portions being arranged at intervals in a circumferential direction of the oil guide plate, and a gap being formed between two adjacent oil guide portions, oil guided through the oil guide portions being able to be guided to the second stator, and oil passing through the gap being able to flow to the outer rotor cooling passage.

2. The dual-rotor electric machine of claim 1, wherein, The oil guide portions are inclined with respect to the axial direction, and the farther the oil guide portions are from the oil guide plate base portion, the farther the oil guide portions extend radially outward.

3. The dual-rotor electric machine of claim 1, wherein, Viewed in a radial direction of the double rotor motor, the oil guide portions overlap with a winding portion of the second stator, and the oil guide portions are located radially inside the winding of the second stator.

4. The dual-rotor electric machine of claim 1, wherein, The outer rotor includes a rotor core provided with a magnet mounting hole extending through the rotor core in the axial direction, and a permanent magnet mounted to the magnet mounting hole, and at least one gap exists between the permanent magnet and an inner wall of the magnet mounting hole, the gap forming the outer rotor cooling passage.

5. The dual rotor electric machine of claim 4, wherein, The magnet mounting hole is V-shaped as a whole, an opening of the V-shape faces radially inward, and the V-shape has both ends and a middle portion each forming the outer rotor cooling passage.

6. The dual-rotor electric machine of claim 1, wherein, The second motor unit further includes an outer rotor support including a disc-shaped portion extending in the radial direction and the circumferential direction of the double rotor motor and a cylindrical portion extending in the axial direction and the circumferential direction of the double rotor motor, the disc-shaped portion being connected to the cylindrical portion, the outer rotor being connected to an inner peripheral surface of the cylindrical portion, the disc-shaped portion being located on one axial side of the second stator, and oil passing through the gap being able to be guided to the outer rotor cooling passage via the outer rotor support.

7. The dual-rotor electric machine of claim 6, wherein, The outer rotor support further includes an oil guide portion provided between the disc-shaped portion and the cylindrical portion, the oil guide portion including a guide surface inclined with respect to the disc-shaped portion and inclined with respect to the cylindrical portion.

8. The dual-rotor electric machine of claim 1, wherein, The double rotor motor further includes a clutch connecting the inner rotor and the outer rotor, and the clutch being able to make the inner rotor and the outer rotor rotate together in transmission of torque or separately rotate by engagement or disengagement of the clutch.

9. The dual-rotor electric machine of claim 8, wherein, The first motor unit further comprises an inner rotor shaft, the inner rotor being connected to the inner rotor shaft, the inner rotor shaft being a hollow shaft, the inner rotor shaft being provided with an oil hole through a peripheral wall of the inner rotor shaft, the inner rotor shaft being provided with the oil hole at least at a radially inner side position of the clutch in an axial direction of the inner rotor shaft.

10. A vehicle powertrain system, characterized by, A dual rotor electric machine comprising the dual rotor electric machine of any one of claims 1 to 9.

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