Electric machine and vehicle

Abstract

The application provides an electric machine and a vehicle, and belongs to the technical field of electric machines.The electric machine comprises an electric machine shell, an inner rotor assembly, a stator assembly and an outer rotor assembly; the electric machine shell has an accommodating cavity inside; the electric machine shell is provided with an oil inlet passage; the stator assembly is fixed to the electric machine shell; the stator assembly comprises a stator core, and a winding set is wound on the stator core, and the axial ends of the winding set extend out of the stator core; the stator assembly is provided with a stator oil passage; the rotor assembly is in an inner-outer sleeving structure with the stator assembly; the rotor assembly is provided with a rotor oil passage; the oil inlet ends of the rotor oil passage and the stator oil passage are respectively communicated with the oil inlet passage; the oil outlet end of the stator oil passage is directed to the extending end of the winding set, and the cooling oil is guided to the extending end of the winding set; and the oil outlet end of the rotor oil passage is directed to the extending end of the winding set, so that the cooling oil is thrown to the extending end of the winding set. The electric machine and the vehicle provided by the application can improve the overall cooling effect of the electric machine and ensure the reliability and stability of the electric machine.

Description

Technical Field

[0001] This application belongs to the field of electric motor technology, and more specifically, relates to an electric motor and a vehicle. Background Technology

[0002] Some motors adopt a dual-rotor output design. A dual-rotor motor usually includes an inner rotor and an outer rotor, and a stator module is set between the inner rotor module and the outer rotor module. During the operation of the motor, a lot of heat is generated. If it cannot be cooled in time, it will affect the service life of the motor.

[0003] In the existing technology, the inner rotor module inside the motor is equipped with an inner rotor oil circuit, the outer rotor module is equipped with an outer rotor oil circuit, and the stator module is equipped with a stator cooling oil circuit. The three circuits cool the three corresponding modules in parallel. However, the actual cooling effect is not good, especially the windings of the stator module, which are often difficult to cool in time, which is not conducive to the reliability and stability of motor operation. Summary of the Invention

[0004] The purpose of this application is to provide an electric motor and vehicle that solves the technical problem of insufficient internal cooling in conventional electric motors, which affects the reliability and stability of motor operation.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, a motor is provided, comprising: The motor housing has an internal cavity; the motor housing is provided with an oil inlet passage. A stator assembly is placed within the receiving cavity and fixed to the motor housing; the stator assembly includes a stator core, on which a winding assembly is wound, with both axial ends of the winding assembly extending out of the stator core; the stator assembly is provided with stator oil passages. The rotor assembly is placed inside the receiving cavity and has an inner-outer sleeve structure with the stator assembly; the rotor assembly is provided with rotor oil passages. The oil inlet end of the rotor oil circuit and the oil inlet end of the stator oil circuit are respectively connected to the oil inlet passage; the oil outlet end of the stator oil circuit faces the extension end of the winding assembly, guiding the cooling oil to the extension end of the winding assembly; the oil outlet end of the rotor oil circuit faces the extension end of the winding assembly, so as to throw the cooling oil to the extension end of the winding assembly.

[0006] The solution shown in this application embodiment, compared with the prior art, achieves main body cooling of the stator assembly and rotor assembly inside the motor housing by cooling the stator assembly through the stator oil circuit and the rotor assembly through the rotor oil circuit. Furthermore, in this application, the cooling oil in the stator oil circuit is guided to the extended end of the winding assembly to achieve main cooling of the extended end of the winding assembly. At the same time, the cooling oil in the rotor oil circuit is thrown to the extended end of the winding assembly to achieve auxiliary cooling of the extended end of the winding assembly. This forms a dual cooling system at the extended end of the winding assembly, doubling the cooling effect and reducing the temperature of the extended end of the winding assembly in a timely manner. This ensures the cooling effect of the winding assembly and improves the reliability and stability of the motor operation.

[0007] In conjunction with the first aspect, in one possible implementation, the rotor assembly includes: The inner rotor assembly is located inside the stator assembly and is rotatably connected to the motor housing; the inner rotor assembly is provided with an inner rotor oil passage. An outer rotor assembly is sleeved outside the stator assembly and rotatably connected to the motor housing; the outer rotor assembly is provided with an outer rotor oil passage. The rotor oil circuit includes an inner rotor oil circuit and an outer rotor oil circuit; the oil outlet of the inner rotor oil circuit faces the inner peripheral wall of the extended end of the winding assembly, and the oil outlet of the outer rotor oil circuit faces the outer peripheral wall of the extended end of the winding assembly, so as to correspondingly throw the cooling oil onto the inner and outer peripheral walls of the extended end of the winding assembly.

[0008] In this embodiment, the cooling oil in the inner rotor oil circuit is spun to the inner peripheral wall of the winding assembly protrusion end to achieve auxiliary cooling of the inner peripheral wall of the winding assembly protrusion end, and the cooling oil in the outer rotor oil circuit is spun to the outer peripheral wall of the winding assembly protrusion end to achieve auxiliary cooling of the outer peripheral wall of the winding assembly protrusion end. This forms a dual auxiliary cooling of the inner and outer peripheral walls, thereby further reducing the temperature of the winding assembly protrusion end and improving the reliability and stability of motor operation.

[0009] In some embodiments, the inner rotor assembly includes an inner core assembly placed inside the stator core, and the inner rotor assembly has two oil outlets, which are respectively located at the two axial ends of the inner core assembly. In the stator core, the two axially extending ends of the winding group are respectively located on both sides of the inner core assembly, and the oil outlets of the two inner rotor assemblies are correspondingly thrown to the inner peripheral walls of the two winding group extension ends.

[0010] In this embodiment, the inner rotor assembly has two oil outlets. By setting the two oil outlets of the inner rotor assembly at the two axial ends of the inner core assembly, each oil outlet of the inner rotor assembly corresponds to one of the extended ends of the winding group, thereby achieving corresponding cooling of the two extended ends of the winding group.

[0011] In some embodiments, the inner rotor assembly further includes an inner rotor shaft rotatably connected to the motor housing; the inner core assembly is circumferentially arranged and fixed on the inner rotor shaft; The inner rotor shaft is provided with a first oil passage, the oil inlet end of the first oil passage is connected to the oil inlet passage, and the inner core assembly is provided with two sets of second oil passages, the oil outlet end of the first oil passage and the oil inlet ends of the two sets of second oil passages are respectively connected to form the inner rotor oil passage.

[0012] In this embodiment, a first oil passage is provided on the inner rotor shaft to guide the cooling oil from the oil inlet passage of the motor housing into the inner rotor shaft. Two sets of second oil passages are provided at the inner core assembly to split the cooling oil and throw it to the two winding groups' protruding ends respectively.

[0013] In some embodiments, both sets of the second oil passages are Z-shaped oil passages; the oil inlet ends of the two sets of the second oil passages are spaced apart along the axial direction of the inner rotor shaft, and the oil outlet ends are respectively located at both ends of the axial direction of the inner core assembly, so that the Z-shaped openings of the two Z-shaped oil passages are opposite.

[0014] Compared to traditional linear oil circuits, this embodiment sets the second oil circuit in a Z-shape, which enables reciprocating flow of the cooling oil and improves the cooling effect of the second oil circuit.

[0015] For example, the inner core assembly includes: The inner rotor core has four axially connected core oil passages. The four core oil passages are arranged in pairs, with two core oil passages in each pair being axially spaced apart. The two sets of core oil passages are circumferentially spaced apart along the inner rotor core. Each set of core oil passages is used to cool the magnets in a corresponding set of magnet slots. A first end plate is disposed at one end of the inner rotor core; the first end plate is provided with a first connecting oil passage extending circumferentially thereon and a first oil-throwing passage extending radially thereon; the first oil-throwing passage extends radially through the first end plate to the outer peripheral wall of the first end plate, so that the through end of the first oil-throwing passage forms an oil outlet end of the inner rotor assembly. The second end plate is located at the other end of the inner rotor core. The second end plate is provided with a second connecting oil passage extending circumferentially thereon and a second oil throwing passage extending radially thereon. The second oil throwing passage extends radially through the second end plate to the outer peripheral wall of the second end plate, so that the through end of the second oil throwing passage forms the oil outlet end of another inner rotor assembly. The first connecting oil circuit is connected to two iron core oil circuits in one group respectively, and one of the two iron core oil circuits in the same group connected by the first connecting oil circuit is connected to the first oil circuit and the other is connected to the second sling oil circuit to form a second oil circuit. The second connecting oil circuit is connected to two iron core oil circuits in another group respectively, and one of the two iron core oil circuits in the same group connected by the second connecting oil circuit is connected to the first oil circuit, and the other is connected to the first sling oil circuit to form another second oil circuit.

[0016] In this embodiment, two sets of core oil passages are provided on the inner rotor core to cool the magnets in the two sets of magnet slots. The first connecting oil passage, the second slinger oil passage, and a set of core oil passages form a U-shaped second oil passage. The cooling oil first enters one core oil passage from the first oil passage, then enters another core oil passage in the same group through the first connecting oil passage, and is slinged out through the second slinger oil passage to the extended end of the winding group. The second connecting oil passage, the first slinger oil passage, and another set of core oil passages form another U-shaped second oil passage, and the U-shaped openings of the two second oil passages are in opposite directions.

[0017] In some embodiments, the magnetic steel grooves in the same group are specifically a first magnetic steel groove and a second magnetic steel groove, both of which have a V-shaped structure; The two core oil circuits in the same group are specifically the first core oil circuit and the second core oil circuit. The first core oil circuit includes branch oil circuits distributed in a V-shape, and the second core oil circuit also has a V-shaped structure. In the radial direction of the inner rotor core, the branch oil passage, the first magnet slot, the second core oil passage, and the second magnet slot are adjacent to each other and spaced apart from the inside out.

[0018] In this embodiment, by setting the shapes of the first and second magnet slots to a V-shape, the magnets can be installed at an angle along the radial direction on the inner rotor core. This reduces the radial dimension of the inner rotor core while meeting the magnet installation requirements, which is beneficial for improving the integration and power density of the inner rotor assembly. Simultaneously, by also setting the branch oil passages and the second core oil passages to a V-shape, targeted cooling of the first and second magnet slots in the same group is achieved, which helps improve the cooling effect of the internal magnets.

[0019] For example, the first core oil circuit further includes: An oil storage chamber is provided to extend through the inner rotor core along its axial direction and is connected to the branch oil passage. The oil storage cavity is connected to the first oil passage via a radially extending connecting oil passage at one axial end.

[0020] In this embodiment of the application, a connecting oil circuit is provided to guide the cooling oil to the oil storage chamber, and then the corresponding first magnet groove is cooled through a branch oil circuit connected to the oil storage chamber.

[0021] For example, the inner rotor shaft has an inner axial oil passage communicating with the oil inlet passage, and two sets of inner radial oil passages, each communicating with the inner axial oil passage; wherein, the two sets of inner radial oil passages are distributed at intervals along the axial direction of the inner rotor shaft, and are correspondingly connected to the two sets of second oil passages; the first oil passage includes the inner axial oil passage and the two sets of inner radial oil passages.

[0022] In this embodiment, an inner axial oil passage is provided to introduce cooling oil from the oil inlet passage into the inner rotor shaft and cool the inner rotor shaft; two inner radial oil passages are provided to guide the cooling oil from the oil inlet passage to the second oil passage.

[0023] In conjunction with the first aspect, in one possible implementation, the outer rotor assembly has a rotor cavity that partially covers the stator assembly and the inner rotor assembly; The cooling oil at the outlet end of the stator oil circuit is guided to the extended end of the winding assembly, and then part of it enters the rotor cavity. The cooling oil at the outlet end of the inner rotor oil circuit is thrown to the extended end of the winding assembly, and then part of it enters the rotor cavity. The oil inlet end of the outer rotor oil circuit is connected to the rotor cavity. The cooling oil provided by the oil inlet passage enters the rotor cavity through the stator oil circuit and / or the inner rotor oil circuit, and then enters the outer rotor oil circuit under the action of the centrifugal force of the outer rotor assembly.

[0024] In this embodiment, the cooling oil that flows to the extended end of the winding assembly enters the rotor cavity and can also enter the outer rotor assembly under the centrifugal force of the outer rotor assembly, thus achieving passive cooling of the outer rotor assembly. This facilitates the full utilization of the cooling oil, allowing the heat inside the motor to be fully absorbed before being discharged outside the motor, thereby improving the utilization rate of the cooling oil.

[0025] In some embodiments, the outer rotor assembly includes: An outer rotor core is arranged around the stator assembly; the outer rotor core has an outer core oil passage that runs through it along its axial direction. An outer rotor support is sleeved and fixed outside the outer rotor core; the outer rotor support has an oil guide portion opposite to one through end of the oil passage of the outer core; An oil baffle ring is disposed between the outer rotor support and the stator assembly, and is opposite to another through end of the outer core oil passage; The cooling oil in the rotor cavity is used to enter the outer core oil circuit from the oil guide section, and is then thrown through the oil baffle ring to the corresponding extended end of the winding assembly.

[0026] In this embodiment, an outer core oil passage is provided inside the outer rotor core to achieve cooling of the outer rotor core; an outer rotor support is provided, and an oil guide is provided on the outer rotor support so that the oil thrown to the oil guide under centrifugal force is introduced into the outer core oil passage, thereby cooling the outer rotor core; an oil baffle ring is provided and is located at another through end of the outer core oil passage to receive the cooling oil in the outer core oil passage and then throw it to the extension end of the winding assembly to achieve auxiliary cooling of the outer peripheral wall of the extension end of the winding assembly.

[0027] For example, the oil guide section includes a plurality of oil guide grooves inclined toward the oil passage of the outer iron core, and the plurality of oil guide grooves are distributed at intervals along the circumference of the outer rotor support.

[0028] In this embodiment, by setting an oil guide groove that is inclined towards the outer iron core oil passage, the cooling oil in the rotor cavity is guided to the outer iron core oil passage through the baffle wall, and then enters the outer iron core oil passage to cool the outer rotor iron core; by distributing multiple oil guide grooves at intervals along the circumference of the outer rotor support, the uniformity of the cooling oil distribution in its circumference can be improved.

[0029] In some embodiments, a first oil storage cavity is provided between the oil baffle ring, the end wall of the outer rotor core, and the outer rotor support. The first oil storage cavity is connected to the oil outlet end of the oil passage of the outer core, and the cooling oil in the first oil storage cavity is used to cool the end of the outer rotor core. A second oil storage chamber is provided between the oil baffle ring and the outer peripheral wall of the extended end of the winding assembly. The second oil storage chamber is connected to the first oil storage chamber. The cooling oil in the second oil storage chamber is used to cool the outer peripheral wall of the extended end of the winding assembly. The external rotor oil circuit includes the external iron core oil circuit, the first oil storage chamber, and the second oil storage chamber.

[0030] In this embodiment, a first oil storage chamber is provided so that the cooling oil in the first oil storage chamber covers the end of the outer rotor core, thereby cooling the end of the outer rotor core; a second oil storage chamber is provided so that the cooling oil covers the outer peripheral wall of the extended end of the winding assembly, thereby cooling the extended end of the winding assembly.

[0031] In conjunction with the first aspect, in one possible implementation, the inner rotor assembly has a first output end extending axially from the motor housing; the outer rotor assembly has a second output end extending from the motor housing; the second output end extends from the motor housing in the same direction as the first output end, and the second output end is rotatably connected to the outside of the first output end.

[0032] In this embodiment, a first output terminal is provided to realize the power output of the inner rotor assembly, and a second output terminal is provided to realize the power output of the outer rotor assembly. By making the first output terminal and the second output terminal extend out of the motor housing in the same direction, the space occupied by the motor in the axial direction is saved, which is beneficial to improving the integration and power density of the motor.

[0033] In some embodiments, the stator core includes an inner stator core and an outer stator core that are disposed and fixed together, and the winding assembly includes an inner layer winding wound on the inner stator core and an outer layer winding wound on the outer stator core. The stator oil circuit has an oil outlet end including a first oil injection hole and a second oil injection hole. The first oil injection hole is disposed facing the inner peripheral wall of the outer winding, and the second oil injection hole is disposed facing the outer peripheral wall of the inner winding.

[0034] In this embodiment, an inner stator core and an outer stator core are provided to correspondingly wind the inner layer winding and the outer layer winding, thereby making the inner stator core and the inner layer winding correspond to the inner rotor assembly, and the outer stator core and the outer layer winding correspond to the outer rotor assembly. Furthermore, the oil outlet end of the stator oil circuit is provided with a first oil injection hole and a second oil injection hole facing the peripheral wall of the corresponding winding group extension end, which can realize corresponding cooling of the outer peripheral wall of the inner layer winding and the inner peripheral wall of the outer layer winding, thereby improving the cooling effect of the winding group.

[0035] Secondly, embodiments of this application also provide a vehicle that includes the aforementioned motor.

[0036] The vehicle provided in this application, having included the aforementioned motor, possesses all the beneficial effects of the aforementioned motor, optimizing the internal cooling structure of the motor, improving the motor cooling effect, and maintaining the stability and reliability of the motor operation. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A cross-sectional structural diagram of the motor provided in an embodiment of this application; Figure 2 For the appendix Figure 1 Enlarged structural diagram at point I; Figure 3 A cross-sectional structural schematic diagram of the inner rotor assembly provided in an embodiment of this application; Figure 4This is a schematic diagram of the first end plate structure provided in an embodiment of this application; Figure 5 This is a schematic diagram of the second end plate structure provided in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of the inner rotor core provided in the embodiments of this application; Figure 7 For the appendix Figure 6 Schematic diagram of the structure at point AA; Figure 8 For the appendix Figure 6 Schematic diagram of the structure at point BB; Figure 9 For the appendix Figure 6 Schematic diagram of the structure at point C; Figure 10 A schematic diagram of the structure of the four core oil circuits (two sets of core oil circuits) provided in the embodiments of this application; Figure 11 This is a schematic diagram of the structure of the external rotor assembly provided in the embodiments of this application; Figure 12 This is a cross-sectional structural schematic diagram of the external rotor assembly provided in an embodiment of this application; Figure 13 For the appendix Figure 12 Enlarged structural diagram at point D; Figure 14 This is a schematic diagram of the structure of the stator assembly provided in an embodiment of this application; Figure 15 For the appendix Figure 14 A schematic cross-sectional view of the middle stator assembly at the EE. Figure 16 This is a schematic diagram of the connection structure of the connector and the oil guide ring provided in the embodiments of this application.

[0039] In the diagram: 1. Motor housing; 11. Oil inlet passage; 12. Receiving cavity; 2. Inner rotor assembly; 21. Inner core assembly; 211. Inner rotor core; 2111. First core oil passage; 21111. Oil storage chamber; 21112. Branch oil passage; 2112. Second core oil passage; 2113. First magnet slot; 2114. Second magnet slot; 2115. Connecting oil passage; 212. First end plate; 2121. First connecting oil passage; 2122. First oil slingering passage; 213. Second end plate; 2131. Second connecting oil passage; 2132. Second oil slingering passage; 22. Inner rotor shaft; 221. Inner axial oil passage; 222. Radial oil passage; 223. First output end; 3. Stator assembly; 31. Stator core; 311. Inner stator core; 312. Outer stator core; 32. Winding assembly; 321. Inner winding; 322. Outer winding; 33. Connector; 34. Oil guide ring; 35. Stator oil passage; 351. First oil injection hole; 352. Second oil injection hole; 4. Outer rotor assembly; 41. Outer rotor core; 411. Outer core oil passage; 42. Outer rotor support; 421. Oil guide; 422. Second output end; 43. Oil retaining ring; 44. First oil reservoir; 45. Second oil reservoir; 5. First bearing; 6. Second bearing; 7. First seal; 8. Second seal. Detailed Implementation

[0040] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0041] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on that other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0043] It should be noted that the orientation or positional relationship indicated by "inner" and "outer" in this embodiment is based on the axis of the motor output shaft. For example, in the inner rotor assembly, the axis direction closer to the motor output shaft is inner, and the axis direction farther away from the motor output shaft is outer.

[0044] In traditional technology, when cooling the inside of a motor, cooling oil is often introduced into the outer rotor module, inner rotor module, and stator module separately through three channels for individual cooling, and cooling is mainly achieved through internal flow channels.

[0045] Furthermore, the cooling of the stator assembly is mainly achieved through the internal oil channels. However, in practical applications, it has been found that when the motor operates at high power density, the heat generated by the windings of the stator assembly increases dramatically. Relying solely on the internal oil channels to cool the windings is insufficient, and the windings inside the stator assembly remain at a high temperature for an extended period, which can affect the operational reliability and stability of the stator assembly and even the entire motor.

[0046] Please refer to the following: Figures 1 to 16 The motor and vehicle provided in this application will now be described. The motor includes a motor housing 1, an inner rotor assembly 2, a stator assembly 3, and an outer rotor assembly 4. The motor housing 1 has an internal cavity 12. The motor housing 1 is provided with an oil inlet passage 11. The stator assembly 3 is placed in the cavity 12 and fixed to the motor housing 1. The stator assembly 3 includes a stator core 31, on which a winding assembly 32 is wound, with both ends of the winding assembly 32 extending out of the stator core 31. The stator assembly 3 is provided with a stator oil passage 35. The rotor assembly is placed in the cavity 12 and has an inner-outer sleeve structure with the stator assembly 3. The rotor assembly is provided with a rotor oil passage. The oil inlet end of the rotor oil passage and the oil inlet end of the stator oil passage 35 are respectively connected to the oil inlet passage 11. The oil outlet end of the stator oil passage 35 faces the extended end of the winding assembly 32, guiding the cooling oil to the extended end of the winding assembly 32. The oil outlet end of the rotor oil passage faces the extended end of the winding assembly 32, so as to throw the cooling oil to the extended end of the winding assembly 32.

[0047] Specifically, the receiving cavity 12 inside the motor housing 1 provides precise installation and operating space for each internal component, ensuring the compactness of the structure; the oil inlet passage 11 on the motor housing 1 is connected to the external cooling oil, which facilitates connection with the vehicle or external cooling system, enabling centralized supply and external management of cooling oil.

[0048] The rotor oil circuit is the main cooling structure for rotor assembly cooling. This rotor oil circuit extends deep into the rotor assembly and can directly remove the heat generated by the rotor assembly itself.

[0049] Optionally, the stator assembly 3 is threadedly connected to the motor housing 1 via a bolt group; the stator assembly 3 and the rotor assemblies on both sides form an electromagnetic interaction surface, which enables the rotation of the rotor assembly inside the motor housing 1.

[0050] The stator assembly 3 is the main heat source of the motor. The winding group 32 of the stator assembly 3 is the area where the heat is most concentrated. The stator oil circuit 35 is set inside the stator assembly 3, which can directly cool the stator core 31 and the winding group 32. The heat conduction path is short and the efficiency is high. The stator oil circuit 35 is the main cooling structure of the stator assembly 3.

[0051] The oil outlet of the stator oil passage 35 faces the protruding end of the winding assembly 32. For example, when the stator oil passage 35 passes through the stator assembly 3, the oil outlet of the stator oil passage 35 can directly guide the cooling oil into the winding assembly 32. For example, the oil outlet of the stator oil passage 35 can also directly guide the cooling oil to the inner peripheral wall, outer peripheral wall, or even the end wall of the winding assembly 32 as needed. The specific configuration of the stator oil passage 35 can be selectively configured according to actual needs.

[0052] It should be noted that the rotor assembly and stator assembly 3 have an inner and outer sleeve structure. Specifically, the stator assembly 3 is sleeved outside the rotor assembly, or the stator assembly 3 is built inside the rotor assembly. Optionally, when the stator assembly 3 is sleeved outside the rotor assembly, the oil outlet of the rotor oil passage faces the inner peripheral wall of the extended end of the winding assembly 32. Optionally, when the stator assembly 3 is built inside the rotor assembly, the oil outlet of the rotor oil passage faces the outer peripheral wall of the extended end of the winding assembly 32. This achieves cooling of the extended end of the winding assembly 32 by the rotor oil passage.

[0053] Furthermore, when the cooling oil is spun onto the extended end of the winding assembly 32, the centrifugal force of the rotor assembly is utilized, eliminating the need for an additional oil pump to deliver power. During the rotation of the rotor assembly, the cooling oil can evenly cover the inner or outer side of the extended end of the winding assembly 32, which is conducive to achieving efficient and energy-saving cooling, reducing system costs and energy consumption, and improving overall machine efficiency.

[0054] It should be understood that in this embodiment, after the cooling oil is guided to the rotor oil circuit through the oil inlet passage 11, it exchanges heat with the rotor assembly, thereby absorbing part of the heat of the rotor assembly and cooling the rotor assembly. The cooling oil discharged from the oil outlet of the rotor oil circuit carries a certain amount of heat, but its temperature is still relatively low compared to the extended end of the winding assembly 32. That is, the temperature of the cooling oil discharged from the oil outlet of the rotor oil circuit is lower than the temperature of the extended end of the winding assembly 32. Therefore, when this part of the cooling oil is thrown to the extended end of the winding assembly 32, the cooling oil can exchange heat with the extended end of the winding assembly 32, thereby providing auxiliary cooling for the winding assembly 32.

[0055] During the cooling process described above, the cooling oil absorbs heat from the rotor assembly and also absorbs some of the heat from the winding assembly 32. This helps to fully utilize the cooling oil, allowing it to absorb heat from various parts of the motor and improve its utilization rate.

[0056] Overall, the dual cooling method for the winding group 32 of the stator assembly 3 effectively controls the operating temperature of the winding group 32, avoiding problems such as winding damage and unstable output caused by overheating, thereby improving the long-term operational reliability and lifespan of the motor.

[0057] The solution shown in this application embodiment, compared with the prior art, achieves the main cooling of the stator assembly 3 and the rotor assembly inside the motor housing 1 by cooling the stator assembly 3 through the stator oil circuit 35 and cooling the rotor assembly through the rotor oil circuit. Furthermore, in this application, the cooling oil in the stator oil circuit 35 is guided to the extended end of the winding assembly 32 to achieve main cooling of the extended end of the winding assembly 32. At the same time, the cooling oil in the rotor oil circuit is thrown to the extended end of the winding assembly 32 to achieve auxiliary cooling of the extended end of the winding assembly 32. Thus, dual cooling is formed at the extended end of the winding assembly 32, achieving double cooling of the extended end of the winding assembly 32, so as to reduce the temperature of the extended end of the winding assembly 32 in a timely manner, focusing on ensuring the cooling effect of the winding assembly 32, and improving the reliability and stability of motor operation.

[0058] For example, the motor housing 1 includes a first housing and a second housing connected to each other. The opposite ends of the first housing and the second housing are the two ends through which the inner rotor assembly 2 passes axially. One of the through ends is provided with a cover plate, and the other through end is used to facilitate the output end of the rotor assembly to extend out of the motor housing 1.

[0059] It should be noted that the oil inlet passage 11 in this application can be one or multiple. The oil inlet passage 11 is used to guide the external cooling oil to the internal structural components of the motor housing 1, that is, the cooling oil is guided to the oil inlet end of the rotor oil circuit and the oil inlet end of the stator oil circuit 35 through the oil inlet passage 11 respectively.

[0060] For example, the motor housing 1 has two sets of oil inlet passages 11, meaning oil enters through two different inlets. One set of oil inlet passages 11 guides the flow to the oil inlet end of the rotor oil circuit, and the other set guides the flow to the oil inlet end of the stator oil circuit 35. Specifically, the oil inlet passage connected to the oil inlet end of the rotor oil circuit is located on the first housing, and the other oil inlet passage 11 is located on the cover plate. For example, the oil entering through the two sets of oil inlet passages 11 can be delivered to the cooling oil through the same power system; preferably, as needed, the oil entering through the two sets of oil inlet passages 11 can be delivered to the cooling oil through a separate power system to ensure a one-to-one correspondence, thereby ensuring a balanced flow rate into the rotor oil circuit and the stator oil circuit 35; specifically, this power system can be a structure such as an oil pump.

[0061] Please see Figure 1In one possible implementation, the rotor assembly includes an inner rotor assembly 2 and an outer rotor assembly 4; the inner rotor assembly 2 is placed inside the stator assembly 3 and is rotatably connected to the motor housing 1; the inner rotor assembly 2 is provided with an inner rotor oil passage; the outer rotor assembly 4 is sleeved on the outside of the stator assembly 3 and is rotatably connected to the motor housing 1; the outer rotor assembly 4 is provided with an outer rotor oil passage; wherein, the rotor oil passage includes an inner rotor oil passage and an outer rotor oil passage; the oil outlet end of the inner rotor oil passage faces the inner peripheral wall of the extended end of the winding assembly 32, and the oil outlet end of the outer rotor oil passage faces the outer peripheral wall of the extended end of the winding assembly 32, so as to correspondingly throw the cooling oil onto the inner and outer peripheral walls of the extended end of the winding assembly 32.

[0062] It is important to understand that the inner rotor oil circuit is the core cooling structure for cooling the inner rotor assembly 2. This inner rotor oil circuit extends deep into the interior of the inner rotor assembly 2 and can directly remove the heat generated by the inner rotor assembly 2 itself. Similarly, the outer rotor oil circuit is the core cooling structure for cooling the outer rotor assembly 4 and can remove most of the heat from the outer rotor assembly 4.

[0063] Specifically, the stator assembly 3 is sandwiched between the inner rotor assembly 2 and the outer rotor assembly 4, so that the stator assembly 3 and the inner rotor assembly 2 and the outer rotor assembly 4 respectively form an inner and outer sleeve structure.

[0064] The outer peripheral wall of the extended end of the winding assembly 32 of the stator assembly 3 faces the outer rotor assembly 4, and the inner peripheral wall faces the inner rotor assembly 2, so that the oil outlet of the inner rotor oil passage faces the inner peripheral wall of the extended end of the winding assembly 32, and the oil outlet of the outer rotor oil passage faces the outer peripheral wall of the extended end of the winding assembly 32. This allows the cooling oil discharged from the inner rotor oil passage and the outer rotor oil passage to be thrown to the inner or outer peripheral wall of the extended end of the winding assembly 32 to cool the corresponding inner or outer peripheral wall of the extended end of the winding assembly 32.

[0065] Specifically, in this embodiment, the cooling oil is guided into the inner rotor oil passage through the oil inlet passage 11 and exchanges heat with the inner rotor assembly 2, thereby absorbing some of the heat of the inner rotor assembly 2 and cooling down the inner rotor assembly 2. The cooling oil discharged from the oil outlet of the inner rotor oil passage carries a certain amount of heat, but its temperature is still relatively low compared to the winding assembly 32. That is, the temperature of the cooling oil discharged from the oil outlet of the inner rotor oil passage is lower than the temperature of the winding assembly 32. Therefore, when this part of the cooling oil is thrown to the inner peripheral wall of the extended end of the winding assembly 32, the cooling oil can continue to exchange heat with the inner peripheral wall of the extended end of the winding assembly 32 to reduce the temperature of the winding assembly 32.

[0066] Similarly, in this embodiment, after the cooling oil is guided to the outer rotor oil passage through the oil inlet passage 11, it exchanges heat with the outer rotor assembly 4, thereby absorbing part of the heat of the outer rotor assembly 4 and cooling down the outer rotor assembly 4. The cooling oil discharged from the oil outlet of the outer rotor oil passage also carries a certain amount of heat, but its temperature is lower than that of the winding assembly 32. Therefore, when this part of the cooling oil is thrown to the outer peripheral wall of the extended end of the winding assembly 32, the cooling oil can exchange heat with the outer peripheral wall of the extended end of the winding assembly 32 to reduce the temperature of the winding assembly 32.

[0067] Optionally, the cooling oil can be directly guided to the outer rotor oil circuit through the oil inlet passage 11, or it can be indirectly guided to the outer rotor oil circuit through other internal oil circuits from the oil inlet passage 11.

[0068] In this embodiment, the cooling oil in the inner rotor oil circuit is spun to the inner peripheral wall of the extended end of the winding assembly 32 to achieve auxiliary cooling of the inner peripheral wall of the extended end of the winding assembly 32, and the cooling oil in the outer rotor oil circuit is spun to the outer peripheral wall of the extended end of the winding assembly 32 to achieve auxiliary cooling of the outer peripheral wall of the extended end of the winding assembly 32. This forms a dual auxiliary cooling of the inner and outer peripheral walls, thereby further reducing the temperature of the extended end of the winding assembly 32 and improving the reliability and stability of the motor operation.

[0069] Please see Figure 1 In some possible embodiments, the inner rotor assembly 2 includes an inner core assembly 21 placed inside the stator core 31. The inner rotor assembly 2 has two oil outlets, which are respectively located at the two axial ends of the inner core assembly 21. In the axial direction of the stator core 31, the two axially extending ends of the winding group 32 are respectively located on the two axial sides of the inner core assembly 21. The oil outlets of the two inner rotor assemblies 2 are correspondingly thrown to the inner peripheral wall of the extending ends of the winding group 32.

[0070] In this embodiment, the inner rotor assembly 2 has two oil outlets. The two oil outlets of the inner rotor assembly 2 are respectively located at the two axial ends of the inner core assembly 21, so that the two oil outlets of the inner rotor assembly 2 correspond to one of the extended ends of the winding group 32, thereby achieving corresponding cooling of the two extended ends of the winding group 32.

[0071] Specifically, in this embodiment, the winding group 32 is not concentrated in the middle of the stator core 31, but extends out of both ends of the stator core 31 along the axial direction of the stator core 31 to form the extended ends of the two winding groups 32.

[0072] Furthermore, in this embodiment, the inner rotor assembly 2 has two oil outlets. When the inner rotor assembly 2 rotates, the two oil outlets of the inner rotor assembly 2 throw oil to the left and right winding groups 32 extension ends respectively, realizing independent oil throwing cooling on the left and right sides. This ensures that the two winding groups 32 extension ends obtain uniform cooling flow and avoids the problem of inconsistent cooling at both ends.

[0073] In addition, on the axial direction of the stator core 31, the two winding groups 32 protruding ends are respectively located on both sides of the axial direction of the inner core assembly 21, so that the two winding groups 32 protruding ends and the inner core assembly 21 are misaligned on the shaft, so that the two oil outlets located at both ends of the inner core assembly 21 can throw oil to the corresponding winding group 32 protruding ends, thereby cooling the protruding ends of the corresponding winding groups 32.

[0074] Please see Figure 1 and Figure 3 In some embodiments, the inner rotor assembly 2 further includes an inner rotor shaft 22 rotatably connected to the motor housing 1; the inner core assembly 21 is arranged around and fixed on the inner rotor shaft 22; wherein, the inner rotor shaft 22 is provided with a first oil passage, the oil inlet end of the first oil passage is connected to the oil inlet passage 11, and the inner core assembly 21 is provided with two sets of second oil passages, the oil outlet end of the first oil passage and the oil inlet ends of the two sets of second oil passages are respectively connected to form an inner rotor oil passage.

[0075] In this embodiment, a first oil passage is provided on the inner rotor shaft 22 to guide the cooling oil from the oil inlet passage 11 of the motor housing 1 into the inner rotor shaft 22. Two sets of second oil passages are provided at the inner core assembly 21 to split the cooling oil and throw it to the protruding ends of the two winding groups 32 respectively.

[0076] The inner rotor shaft 22 passes through the motor housing 1 and is rotatably connected to the motor housing 1. The inner rotor shaft 22 is used as a rotational support for the inner rotor assembly 2. Optionally, the inner rotor shaft 22 and the motor housing 1 are rotatably connected through a rotating bearing, which can ensure rotational stability and support rigidity.

[0077] The first oil passage extends axially, and the oil outlet of the first oil passage is split into two sets of second oil passages. The two sets of second oil passages are independent of each other and are correspondingly thrown to the extended ends of the two winding groups 32.

[0078] For example, the outlet of the second oil passage is configured as an oil slinger or oil slinger hole, which is used to sling oil to the protruding end of the adjacent winding assembly 32 to cool the winding assembly 32.

[0079] The inner iron core assembly 21 is fixed on the inner rotor shaft 22 and is located inside the stator iron core 31. By fixing the inner iron core assembly 21 to the inner rotor shaft 22, the inner rotor shaft 22 rotates with the inner iron core assembly 21. Optionally, the inner iron core assembly 21 and the inner rotor shaft 22 can be fixed by interference fit, key connection, etc. to ensure reliable torque transmission and no relative sliding.

[0080] Please refer to Figure 3 , in some embodiments, both groups of second oil passages are in the shape of a "Ji" character oil passage; the oil inlet ends of the two groups of second oil passages are arranged at intervals along the axial direction of the inner rotor shaft 22, and the oil outlet ends are respectively arranged at both axial ends of the inner iron core assembly 21, so that the opening directions of the "Ji" characters of the two "Ji" character oil passages are opposite.

[0081] Compared with the traditional straight oil passage, in this embodiment, by setting the second oil passage as a "Ji" character oil passage, the reciprocating flow of the cooling oil can be realized, which is beneficial to improving the cooling effect of the second oil passage.

[0082] The "Ji" character oil passage is in the shape of a "Ji" character, that is, it first extends radially outward, then axially, then radially outward, then axially extends in the opposite direction, and finally radially throws the flow to the outside of the inner iron core assembly 21 to cool the extended end of the winding group 32. The setting of this "Ji" character second oil passage can guide the cooling oil from the oil inlet at the inner edge of the inner iron core assembly 21 to the oil outlet at the end face of the inner iron core assembly 21 within the limited axial and radial spaces of the inner iron core assembly 21, avoiding interference between the second oil passage and other structures, such as magnetic steel slots, weight reduction holes, rivet holes, etc.

[0083] Moreover, the "Ji" character oil passage can make the cooling oil have enough residence time inside the inner iron core assembly 21 to absorb the heat of the inner iron core assembly 21 by setting the flow direction and path length of the cooling oil, realizing the cooling function of the inner iron core assembly 21 itself.

[0084] In addition, compared with the straight long hole, the "Ji" character oil passage can avoid the high stress areas of the iron core, such as the tooth root, yoke, etc., reducing the weakening of the mechanical strength of the inner iron core assembly 21.

[0085] The oil inlet ends of the two groups of second oil passages are arranged at intervals axially, which is convenient for the axial positions of the two groups of second oil passages to correspond to the two groups of inner radial oil passages 222 on the inner rotor shaft 22 below one by one, realizing the shortest path docking and reducing the leakage risk of the cooling oil at the interface.

[0086] The oil outlet ends of the two groups of second oil passages are respectively arranged at both axial ends of the inner iron core assembly 21, which can correspond to the positions of the extended ends of the two winding groups 32, ensuring that the ejected cooling oil can directly spray onto the extended ends of the winding group 32.

[0087] The two sets of second oil passages have opposite opening directions, so that after starting from the oil inlet end of the inner core assembly 21, the two sets of second oil passages extend in opposite directions to the left and right ends of the inner core assembly 21 respectively, and will not cross or overlap with each other inside the inner core assembly 21, thus avoiding interference and crosstalk between the oil passages.

[0088] It should be noted that each group of second oil circuits can be configured as multiple lines, and multiple second oil circuits can be arranged circumferentially along the inner core assembly 21. Furthermore, the oil outlet end of each second oil circuit forms the oil outlet end of an inner rotor assembly 2, and the oil outlet ends of multiple second oil circuits in the same group form multiple oil outlet ends of the same group of inner rotor assembly 2. For example, each group of second oil circuits can also be configured as one line.

[0089] Please see Figures 3 to 10 For example, the inner core assembly 21 includes an inner rotor core 211, a first end plate 212, and a second end plate 213. The inner rotor core 211 has four axially penetrating core oil passages, which are arranged in pairs. The two core oil passages in each pair are spaced apart axially, and the two pairs of core oil passages are spaced apart circumferentially along the inner rotor core 211. Each pair of core oil passages is used to cool the magnets in a corresponding pair of magnet slots. The first end plate 212 is located at one end of the inner rotor core 211. The first end plate 212 has a first connecting oil passage 2121 extending circumferentially and a first oil-throwing passage 2122 extending radially. The first oil-throwing passage 2122 extends radially through the first end plate 212 to the outer peripheral wall of the first end plate 212, so that the penetrating end of the first oil-throwing passage 2122 forms an oil outlet end of the inner rotor assembly 2. The second end plate 213 is located at the other end of the inner rotor core 211. The second end plate 213 is provided with a second connecting oil passage 2131 extending circumferentially therein and a second oil-throwing passage 2132 extending radially therein; the second oil-throwing passage 2132 extends radially through the second end plate 213 to the outer peripheral wall of the second end plate 213, so that the through end of the second oil-throwing passage 2132 forms the oil outlet end of another inner rotor assembly 2; wherein, the first connecting oil passage 2121 is connected to two iron core oil passages of one group respectively, and of the two iron core oil passages in the same group connected by the first connecting oil passage 2121, one is connected to the first oil passage and the other is connected to the second oil-throwing passage 2132 to form a second oil passage; the second connecting oil passage 2131 is connected to two iron core oil passages of another group respectively, and of the two iron core oil passages in the same group connected by the second connecting oil passage 2131, one is connected to the first oil passage and the other is connected to the first oil-throwing passage 2122 to form another second oil passage.

[0090] In this embodiment, two sets of core oil passages are provided on the inner rotor core 211 to cool the magnets in the two sets of magnet slots. The first connecting oil passage 2121, the second oil throwing passage 2132 and a set of core oil passages form a Z-shaped second oil passage. The cooling oil first enters one core oil passage from the first oil passage, and then enters another core oil passage in the same group through the first connecting oil passage 2121, and is thrown out through the second oil throwing passage 2132 to the extended end of the winding group 32. The second connecting oil passage 2131, the first oil throwing passage 2122 and another set of core oil passages form another Z-shaped second oil passage, and the Z-shaped openings of the two second oil passages are opposite in direction.

[0091] In this embodiment, the core oil circuit is axially connected, which is beneficial to achieve axial cooling of the cooling oil. The four core oil circuits are grouped in pairs. By distributing the two core oil circuits in the same group in a directional manner and distributing the core oil circuits in the two groups in a circumferential manner, different parts of the inner rotor core 211 are cooled in the radial and circumferential directions, which is beneficial to achieve uniform cooling.

[0092] It is understood that in the embodiments of this application, the magnet slots and the core oil circuits are in one-to-one correspondence. The primary task of the core oil circuit is to cool the magnets in the magnet slots. Each set of core oil circuits is used to cool the magnets in one set of magnet slots, so as to achieve corresponding cooling of the core oil circuits and magnet slots. This is beneficial for targeted cooling of the magnets in the inner rotor core 211 and can achieve precise cooling of the object being cooled.

[0093] The first connecting oil passage 2121 and the second connecting oil passage 2131 are used to cool the two core oil passages in the same group. The first oil-throwing passage 2122 and the second oil-throwing passage 2132 are used to throw oil from both ends of the inner core assembly 21 axially. The first oil-throwing passage 2122 extends radially to the outer peripheral wall, and this end is the oil outlet. When the first end plate 212 rotates with the inner rotor core 211, the cooling oil is thrown out from this end under the action of centrifugal force and flows directly to the inner peripheral wall of the protruding end of the adjacent winding group 32. Similarly, the second oil-throwing passage 2132 can be thrown to the inner peripheral wall of the protruding end of the other winding group 32 under the action of centrifugal force.

[0094] Optionally, two sets of magnet slots, two sets of iron core oil circuits, a first connecting oil circuit 2121, a first oil throwing circuit 2122, a second connecting oil circuit 2131 and a second oil throwing circuit 2132 are defined as a module unit. One such module unit can be provided on the inner iron core assembly 21. Each module unit has two second oil circuits, and the oil outlet ends of the two second oil circuits are respectively arranged at the two axial ends of the inner iron core assembly 21 to form two oil outlet ends of the inner iron core assembly 21, or it can be understood as two oil outlet ends of the inner rotor assembly 2, or the oil outlet ends of the two second oil circuits; alternatively, multiple module units can be provided, and the multiple module units can be distributed at intervals along the circumferential direction of the inner iron core assembly 21. At this time, the multiple module units correspondingly form multiple second oil circuits, but at least two of the oil outlet ends of the multiple inner iron core assemblies 21 formed are in one-to-one correspondence with the extending ends of the two winding groups 32.

[0095] During the flow of one second oil circuit, it cools a set of magnets and an extending end of a winding group 32 in sequence, achieving cross-region series cooling of the magnets and the winding group 32, and all high-heat-generating components are effectively cooled.

[0096] Specifically, the two iron core oil circuits in the same group are specifically defined as the first iron core oil circuit 2111 and the second iron core oil circuit 2112. In a second oil circuit in a shape of a "ji" character, the flow path of the cooling oil fluid is as follows: the first oil circuit on the inner rotor shaft 22, the first iron core oil circuit 2111, the first connecting oil circuit 2121, the second iron core oil circuit 2112, the second oil throwing circuit 2132, an oil outlet end on the outer periphery of the second end plate 213, and an extending end of a winding group 32.

[0097] In another second oil circuit in a shape of a "ji" character, the flow path of the cooling oil fluid is as follows: the first oil circuit on the inner rotor shaft 22, the first iron core oil circuit 2x11, the second connecting oil circuit 2131, the second iron core oil circuit 2112, the first oil throwing circuit 2122, an oil outlet end on the outer periphery of the second end plate 213, and another extending end of a winding group 32.

[0098] It should be understood that in the two sets of iron core oil circuits, the first iron core oil circuit 2111 is connected to the first oil circuit, that is, the two second oil circuits are connected to the first oil circuit. Since the two second oil circuits are "ji"-shaped oil circuits with opposite flow directions, actually, the connection points of the two first iron core oil circuits 2111 and the first oil circuit are arranged at intervals along the axial direction of the inner rotor shaft 22, and after entering the two first iron core oil circuits 2111 in different groups, the cooling oil fluid flows in the opposite direction.

[0099] Please refer to Figures 7 to 9In some embodiments, the magnet slots in the same group are specifically the first magnet slot 2113 and the second magnet slot 2114, both of which have a V-shaped structure. According to the above definition, the two iron core oil circuits in the same group are specifically the first iron core oil circuit 2111 and the second iron core oil circuit 2112. In this embodiment, the first iron core oil circuit 2111 includes a branch oil circuit 21112 that is distributed in a V-shape, and the second iron core oil circuit 2112 also has a V-shaped structure. In the radial direction of the inner rotor iron core 211, the branch oil circuit 21112, the first magnet slot 2113, the second iron core oil circuit 2112 and the second magnet slot 2114 are adjacent to each other and spaced apart from the inside out.

[0100] In this embodiment, by setting the shapes of the first magnet slot 2113 and the second magnet slot 2114 to a V-shape, the magnets can be installed at an angle along the radial direction on the inner rotor core 211. This reduces the radial dimension of the inner rotor core 211 while meeting the magnet installation requirements, which is beneficial for improving the integration and power density of the inner rotor assembly 2. Simultaneously, by also setting the branch oil passage and the second core oil passage 2112 to a V-shape, targeted cooling of the first magnet slot 2113 and the second magnet slot 2114 in the same group is achieved, which is beneficial for improving the cooling effect of the internal magnets.

[0101] The topological structure of the V-shaped magnet groove allows the magnetic fields of two magnets to be superimposed on the same side, which is beneficial to improving the air gap magnetic flux density and torque density. In addition, the V-shaped groove structure is stable, making it easy to insert and fix rectangular permanent magnets, and the manufacturing process is mature.

[0102] The branch oil passage 21112 and the second iron core oil passage 2112 also have a V-shaped structure, so that the shape of the oil passage follows the V-shaped direction of the magnet groove, and the cooling oil can flow in the direction of the magnet surface, which is conducive to achieving efficient heat exchange.

[0103] The first iron core oil circuit 2111 includes V-shaped branch oil circuits 21112. These branch oil circuits 21112 can be two small oil circuits, which correspond to the two arms of the V-shaped first magnet groove 2113 respectively, and can simultaneously cool the two arms of the V-shaped magnet with a smaller temperature difference.

[0104] The branch oil passages 21112, the first magnet slot 2113, the second core oil passage 2112, and the second magnet slot 2114 are radially spaced from the inside out, allowing for a radially alternating arrangement of the oil passages and magnets. This ensures that the magnets are adjacent to the radially inner cooling oil passages, which is beneficial for improving the cooling effect of the magnets. Furthermore, without increasing the rotor's outer diameter, the compact arrangement of double-layer magnets and double-layer oil passages improves torque density and power density.

[0105] For example, the size of the first magnet groove 2113 is larger than the size of the second magnet groove 2114 to form a large magnet groove and a small magnet groove. The first magnet groove 2113 is equipped with a larger magnet. The radial sides of the larger magnet correspond to the branch oil passage 21112 and the second iron core oil passage 2112, respectively, so that the cooling oil passages on both sides can be fully utilized to cool the large magnet groove.

[0106] In this application, the magnets are arranged adjacently rather than in direct contact. A thin iron core wall separates the oil passage from the magnet slot to ensure the connection stability of the magnets in the corresponding magnet slots and to ensure the cooling effect of the magnets.

[0107] Please see Figures 7 to 9 For example, the first core oil passage 2111 further includes an oil storage chamber 21111 and a connecting oil passage 2115; the oil storage chamber 21111 is arranged through the axial direction of the inner rotor core 211 and is connected to the branch oil passage 21112; wherein, one axial end of the oil storage chamber 21111 is connected to the first oil passage through the radially extending connecting oil passage 2115.

[0108] Specifically, the connecting oil passage 2115 is arranged to extend radially along the inner rotor core 211. One end of the connecting oil passage 2115 is connected to the first oil passage, and the other end is connected to the oil storage chamber 21111, which is used to guide the cooling oil from the first oil passage to the oil storage chamber 21111.

[0109] In this embodiment of the application, a connecting oil passage 2115 is provided to guide the cooling oil to the oil storage chamber 21111, and then the corresponding first magnet groove 2113 is cooled by the branch oil passage 21112 connected to the oil storage chamber 21111.

[0110] The oil storage chamber 21111 can store and buffer the cooling oil, and the connecting oil passage 2115 is used to form an oil supply channel from the first oil passage to the second oil passage, so that the oil passage 2111 of the first iron core is specifically adjusted from a single flow channel to a system with oil storage and distribution functions.

[0111] The oil storage chamber 21111 is axially connected, forming a long strip-shaped oil storage space that can store a certain amount of cooling oil, playing a buffering and pressure stabilizing role and preventing cooling interruption due to oil supply fluctuations. In addition, the oil storage chamber 21111 itself is also a channel through which the oil flows. Its inner wall is in direct contact with the inner rotor core 211, increasing the heat exchange area between the cooling oil and the inner rotor core 211, and can carry away additional heat from the inner rotor core 211.

[0112] The connecting oil passage 2115 serves as a bridge, connecting the first oil passage in the inner rotor shaft 22 with the oil storage chamber 21111 in the inner rotor core 211, forming a complete oil supply chain consisting of the first oil passage, the connecting oil passage 2115, the oil storage chamber 21111, and the branch oil passage 21112.

[0113] Specifically, the inner rotor core 211 includes a plurality of core laminations stacked axially along the inner rotor shaft 22, and the plurality of core laminations are used to form the first core oil passage 2111 and the second core oil passage 2112.

[0114] Each core lamination has two sets of axially connected magnet holes. Each set of magnet holes includes a large magnet hole and a small magnet hole. The large magnet holes on adjacent core laminations are axially connected to form a first magnet groove 2113, and the small magnet holes on adjacent core laminations are axially connected to form a second magnet groove 2114.

[0115] Optionally, two sets of magnet holes are defined as a magnet unit, and multiple magnet units can be distributed along the circumference of the iron core lamination.

[0116] For example, each core lamination is provided with two sets of first core holes and two sets of second core holes that are axially connected. The first core holes on multiple core laminations are axially connected to form a first core oil passage 2111; the second core holes on multiple core laminations are axially connected to form a second core oil passage 2112; further, the two sets of first core holes and the two sets of second core holes are defined as a sub-module. Optionally, multiple sub-modules can be provided on the core lamination along its axial direction.

[0117] Furthermore, each group of first iron core holes includes a central hole and a branch hole, the branch hole is connected to the central hole, and the branch hole extends along the length direction of the corresponding magnet hole; wherein, the central holes on multiple iron core laminations are axially connected to form an oil storage cavity 21111, and the branch holes on multiple iron core laminations are axially connected to form a branch oil passage 21112.

[0118] Specifically, radially extending connecting grooves are provided on the two iron core laminations located at both ends of the axial direction. One end of the connecting groove is connected to the middle hole, and the other end is connected to the first oil passage. A connecting oil passage is formed at the connecting groove so that the connecting oil passage connects the first oil passage and the first iron core oil passage 2111. It should be noted that in each of two adjacent sets of first iron core holes, only one set of first iron core holes is provided with a connecting groove. On the iron core laminations at both ends, when a connecting groove is provided on one end of the iron core lamination, no connecting groove is provided on the other end of the iron core lamination, so as to form two sets of oil inlet ends of the second oil passages with opposite directions in a zigzag shape.

[0119] Please see Figure 3 For example, the inner rotor shaft 22 has an inner axial oil passage 221 that communicates with the oil inlet passage 11, and two sets of inner radial oil passages 222 that are respectively communicated with the inner axial oil passage 221; wherein, the two sets of inner radial oil passages 222 are distributed at intervals along the axial direction of the inner rotor shaft 22, and are connected to the two sets of second oil passages in a one-to-one correspondence; the first oil passage includes the inner axial oil passage 221 and the two sets of inner radial oil passages 222.

[0120] In this embodiment, an inner axial oil passage 221 is provided to introduce cooling oil from the oil inlet passage 11 into the inner rotor shaft 22 and cool the inner rotor shaft 22; two inner radial oil passages 222 are provided to guide the cooling oil from the oil inlet passage 11 to the second oil passage.

[0121] The inner axial oil passage 221 can introduce oil from the shaft end and guide it into the inner rotor shaft 22. The inner radial oil passage 222 is connected to the inner axial oil passage 221, realizing the flexible direction of oil flow from axial to radial.

[0122] Specifically, the inner rotor shaft 22 is provided with an inner axial hole extending along its axial direction, and an inner axial oil passage 221 is formed in the inner axial hole; the inner rotor shaft 22 is also provided with two sets of inner radial holes, which are distributed at intervals along the axial direction of the inner rotor shaft 22 and correspond one-to-one with the protruding ends of the two winding groups 32; there are multiple inner radial holes in each set, which are distributed at intervals along the circumference of the inner rotor shaft 22, and one end of the inner radial hole is connected to the inner axial hole, and the other end is used to connect to the second oil passage, and an inner radial oil passage 222 is formed in each set of inner radial holes.

[0123] Two sets of inner radial oil passages 222 are distributed axially along the inner rotor shaft 22, which can realize the separate guidance of the two sets of second oil passages. Furthermore, the axially spaced distribution ensures that there is sufficient distance between the two sets of radial oil passages 222, preventing the cooling oil from affecting each other on the outer surface of the inner rotor shaft 22 and ensuring independent oil supply on the left and right sides.

[0124] The two sets of inner radial oil passages 222 are axially spaced and respectively connected to the second oil passage, which is conducive to achieving independent and parallel oil supply to the winding groups 32 at both ends of the motor axis and avoiding mutual interference.

[0125] Please see Figure 1 In some possible embodiments, the outer rotor assembly 4 has a rotor cavity that is partially covered by the stator assembly 3 and the inner rotor assembly 2; the cooling oil at the outlet end of the stator oil passage 35 is guided to the protruding end of the winding assembly 32 and then partially enters the rotor cavity; the cooling oil at the outlet end of the inner rotor oil passage is thrown to the protruding end of the winding assembly 32 and then partially enters the rotor cavity; the inlet end of the outer rotor oil passage is connected to the rotor cavity; the cooling oil provided by the oil inlet passage 11 enters the rotor cavity through the stator oil passage 35 and / or the inner rotor oil passage, and then enters the outer rotor oil passage under the action of the centrifugal force of the outer rotor assembly 4.

[0126] In this embodiment, the cooling oil that flows to the extended end of the winding assembly 32 will enter the rotor cavity and can also enter the outer rotor assembly 4 under the centrifugal force of the outer rotor assembly 4, thus achieving passive cooling of the outer rotor assembly 4. This is beneficial to fully utilize the cooling oil, so as to fully absorb the heat inside the motor and then export it outside the motor, thereby improving the utilization rate of the cooling oil.

[0127] Specifically, the outer rotor assembly 4 has a rotor cavity partially covered by the stator assembly 3 and the inner rotor assembly 2. The oil inlet end of the outer rotor oil passage is connected to the rotor cavity. After the cooling oil provided by the oil inlet passage 11 is spun out by the stator oil passage 35 and / or the inner rotor oil passage, some of the cooling oil will enter the rotor cavity and can enter the outer rotor oil passage under the action of the centrifugal force of the outer rotor assembly 4.

[0128] It should be noted that some of the cooling oil will not enter the rotor cavity during the slinging process, but will return to the receiving cavity 12; the motor housing 1 is provided with an oil return port that connects to the receiving cavity 12. The oil return port is used to export the cooling oil in the receiving cavity 12 to the outside of the motor housing 1, so as to avoid excessive retention of cooling oil in the receiving cavity 12.

[0129] After cooling the extended end of the winding assembly 32, some of the cooling oil in the stator oil circuit 35 and the inner rotor oil circuit enters the rotor cavity for convenient subsequent extraction, collection, and recycling. During the entry of the cooling oil into the rotor cavity, it sinks to the bottom of the cavity due to gravity, and then centrifugal force propels the used cooling oil into the cavity, requiring no additional power, making it energy-efficient and reliable. In other words, the cooling oil is introduced into the outer rotor assembly 4 without the need for pumping or pressurization; instead, it enters the outer rotor oil circuit under the centrifugal force of the outer rotor assembly 4.

[0130] This embodiment provides an oil inlet path for the external rotor oil circuit. Specifically, the cooling oil flow path is: oil inlet passage 11, stator oil circuit 35 / inner rotor oil circuit, rotor cavity, and oil inlet end of the external rotor oil circuit. This oil inlet path enables passive oil cooling of the external rotor oil circuit. That is, the external rotor oil circuit does not need to be directly supplied with high-pressure oil from the oil inlet passage 11. Instead, it uses the low-pressure oil in the rotor cavity and the centrifugal force of the external rotor assembly 4 to guide the cooling oil into the external rotor oil circuit, which reduces the total demand of the system on the oil pump pressure and flow rate, and helps to save energy and reduce consumption.

[0131] It is understandable that when the outer rotor assembly 4 rotates, the centrifugal force at its oil inlet end will have a suction effect on the cooling oil in the rotor cavity, drawing the cooling oil into the outer rotor oil circuit, so that the cooling oil enters the outer rotor oil circuit under the action of centrifugal force.

[0132] Specifically, the coolant with the lowest temperature is preferentially used to cool the winding group 32 in the stator assembly 3, and the coolant after heating is reused to cool the outer rotor assembly 4, which has relatively lower requirements. This maximizes the utilization of the heat capacity of the coolant and reduces the total amount of oil required.

[0133] It should be understood that the cooling oil collected in the rotor cavity in this embodiment, although heated, still has the ability to absorb heat and can be guided to the outer rotor oil circuit for cooling the outer rotor assembly 4.

[0134] Please see Figures 11 to 12 In some embodiments, the outer rotor assembly 4 includes an outer rotor core 41, an outer rotor support 42, and an oil baffle ring 43; the outer rotor core 41 is arranged around the stator assembly 3; the outer rotor core 41 has an outer core oil passage 411 that runs through it along its axial direction; the outer rotor support 42 is sleeved and fixed around the outer rotor core 41; the outer rotor support 42 has an oil guide portion 421 that is opposite to one through end of the outer core oil passage 411; the oil baffle ring 43 is arranged around the outer rotor support 42 and the stator assembly 3, and is opposite to the other through end of the outer core oil passage 411; wherein, the cooling oil in the rotor cavity is used to enter the outer core oil passage 411 from the oil guide portion 421, and is thrown to the corresponding extended end of the winding assembly 32 through the oil baffle ring 43.

[0135] In this embodiment, an outer core oil passage 411 is provided inside the outer rotor core 41 to cool the outer rotor core 41. An outer rotor support 42 is provided, and an oil guide 421 is provided on the outer rotor support 42 so that the oil that flows to the oil guide 421 under centrifugal force is introduced into the outer core oil passage 411, thereby cooling the outer rotor core 41. An oil baffle ring 43 is provided and is located at another through end of the outer core oil passage to receive the cooling oil in the outer core oil passage 411 and then throw it to the extension end of the winding assembly 32 to achieve auxiliary cooling of the outer peripheral wall of the extension end of the winding assembly 32.

[0136] Specifically, the outer rotor support 42 is fixedly connected to the outer rotor core 41 so that the outer rotor support 42 rotates with the outer rotor core 41. The outer rotor support 42 partially covers the stator assembly 3 and the inner rotor assembly 2 and has the aforementioned rotor cavity. Optionally, the outer rotor support 42 and the outer rotor core 41 can be fixed together by key connection, welding, interference fit, bolt connection, or other methods.

[0137] The outer core oil passage 411 is axially continuous, allowing cooling oil to flow directly from one end of the outer rotor core 41 to the other. This facilitates long-distance axial flow of the cooling oil, directly carrying away the iron loss heat of the outer rotor core 41 and reducing the temperature rise of the outer rotor. Furthermore, as an electromagnetic component, the outer rotor core 41 has limited mechanical strength; the outer rotor support 42, as a structural component, enhances the rigidity and centrifugal force resistance of the entire outer rotor assembly 4, enabling it to withstand high-speed rotation.

[0138] The oil guide section 421 is located on the outer rotor support 42 and is opposite to one of the through ends of the outer iron core oil passage 411. It is responsible for guiding the cooling oil from the rotor cavity into the outer iron core oil passage 411.

[0139] For example, the shape of the oil guide part 421 can be set as a slope, a guide groove or an opening, etc. The oil guide part 421 can be designed to generate negative pressure when the outer rotor assembly 4 rotates, actively drawing the oil in the rotor cavity into the oil passage to achieve self-priming oil supply.

[0140] The oil baffle ring 43 is located between the outer rotor support 42 and the stator assembly 3. It can prevent the cooling oil from splashing directly from the outlet of the outer core oil passage 411 to other non-target areas. Since the oil outlet end of the oil baffle ring 43 faces the extension end of the winding assembly 32, the cooling oil at the oil outlet end of the outer core oil passage 411 can be thrown through the oil baffle ring 43 to the outer peripheral wall of the extension end of the winding assembly 32 to achieve cooling of the extension end of the winding assembly 32.

[0141] It should be understood that the cooling oil flowing out from the outer rotor oil circuit still has heat absorption capacity, which is used to assist in cooling the outer peripheral wall of the extended end of the winding assembly 32 after cooling the outer rotor core 41, thus realizing the three-fold utilization of the cooling oil.

[0142] Specifically, the flow path of the cooling oil in the outer rotor assembly 4 is as follows: rotor cavity, oil guide part 421, outer iron core oil passage 411, oil baffle ring 43, centrifugal oil throwing to the outer peripheral wall of the extended end of the winding group 32, forming a closed loop from oil suction, oil transportation to oil throwing.

[0143] The method of throwing oil from the outer rotor oil circuit to the outer peripheral wall of the extended end of the winding assembly 32, together with the method of throwing oil from the inner rotor oil circuit to the inner peripheral wall of the extended end of the winding assembly 32, forms an internal and external sandwich cooling method, which makes the heat dissipation of the extended end of the winding assembly 32 without dead corners and can significantly improve the continuous power density of the motor.

[0144] Please see Figure 12 For example, the oil guide section 421 includes a plurality of oil guide grooves inclined in the direction of the outward iron core oil passage 411, and the plurality of oil guide grooves are distributed at intervals along the circumference of the outer rotor support 42.

[0145] In this embodiment, an oil guide groove inclined towards the outer core oil passage 411 is provided so that the cooling oil in the rotor cavity is guided to the outer core oil passage 411 through the oil guide groove, and then enters the outer core oil passage 411 to cool the outer rotor core 41. By distributing multiple oil guide grooves at intervals along the circumference of the outer rotor support 42, the uniformity of the cooling oil distribution in its circumference can be improved.

[0146] Specifically, the oil guide groove has an inclination that extends outward in the direction of the iron core oil passage 411; specifically, the oil guide groove is connected to the end of the iron core oil passage, and the radial depth of the oil guide groove gradually increases away from the iron core oil passage, so as to guide the cooling oil into the iron core oil passage.

[0147] Furthermore, the outer rotor core 41 is provided with multiple axial oil holes that extend along its axis, and these axial oil holes are used to guide cooling oil. These multiple axial oil holes form the outer core oil passage 411. Multiple oil guide grooves correspond one-to-one with the multiple axial oil holes, and each oil guide groove is connected to its corresponding axial oil hole to achieve precise introduction of cooling oil.

[0148] For example, the oil guide section 421 includes a baffle that is inclined from the stator assembly 3 toward the outer core oil passage 411, and the baffle is in contact with the radial outer peripheral wall of the outer core oil passage 411.

[0149] In this embodiment, a baffle wall is set in the direction of the outer core oil passage 411 of the self-stator assembly 3 so that the cooling oil in the rotor cavity is guided to the outer core oil passage 411 through the baffle wall, and then enters the outer core oil passage 411 to cool the outer rotor core 41. By making the baffle wall in contact with the radial outer peripheral wall of the outer core oil passage 411, the cooling oil can be prevented from deviating to the shaft end wall of the outer rotor core 41, which would affect the flow.

[0150] Specifically, when the outer rotor assembly 4 rotates, the cooling oil in the rotor cavity is thrown outward under the action of centrifugal force. The inclined baffle can actively intercept and capture the flowing cooling oil and guide it to the inlet of the outer iron core oil passage 411, which significantly improves the oil intake efficiency.

[0151] Furthermore, the baffle wall is directly and tightly attached to or seamlessly connected to the radial outer peripheral wall of the outer iron core oil passage 411, forming a sealed oil passage inlet transition zone. This ensures that the oil captured by the baffle wall can enter the outer iron core oil passage 411 completely and without damage, thus preventing leakage or scattering of the cooling oil at the inlet.

[0152] Please see Figure 13In some embodiments, a first oil storage cavity 44 is provided between the oil baffle ring 43 and the end wall of the outer rotor core 41 and the outer rotor support 42. The first oil storage cavity 44 is connected to the oil outlet end of the outer core oil passage 411. The cooling oil in the first oil storage cavity 44 is used to cool the end of the outer rotor core 41. A second oil storage cavity 45 is provided between the oil baffle ring 43 and the outer peripheral wall of the winding assembly 32. The second oil storage cavity 45 is connected to the first oil storage cavity 44. The cooling oil in the second oil storage cavity 45 is used to cool the outer peripheral wall of the extended end of the winding assembly 32. The outer rotor oil passage includes the outer core oil passage 411, the first oil storage cavity 44 and the second oil storage cavity 45.

[0153] In this embodiment, a first oil storage chamber 44 is provided so that the cooling oil in the first oil storage chamber 44 covers the end of the outer rotor core 41, thereby cooling the end of the outer rotor core 41; a second oil storage chamber 45 is provided so that the cooling oil covers the outer peripheral wall of the extended end of the winding assembly 32, thereby cooling the extended end of the winding assembly 32.

[0154] The oil baffle ring 43, together with the end wall of the outer rotor core 41 and the outer rotor support 42, forms a relatively closed first oil reservoir 44. This allows the cooling oil flowing from the outer core oil passage 411 to accumulate here before being thrown out, forming a localized oil pool. The cooling oil accumulated in the first oil reservoir 44 directly contacts the end wall of the outer rotor core 41. When the outer rotor core 41 rotates at high speed, the heat generated at its end can be directly carried away by this portion of cooling oil through immersion or soaking, which helps to improve the cooling efficiency of the outer rotor core 41.

[0155] Furthermore, the oil baffle ring 43 is also provided with an oil-throwing port that connects the first oil storage chamber 44 and the second oil storage chamber 45. The oil-throwing ports are distributed at intervals along the circumference of the oil baffle ring 43 to allow the cooling oil to enter the second oil storage chamber 45 evenly from the first oil storage chamber 44, thereby realizing the connection between the first oil storage chamber 44 and the second oil storage chamber 45. The oil-throwing ports can make the cooling oil evenly distributed along the circumference under the action of centrifugal force. The setting of the second oil storage chamber 45 can avoid local hot spots.

[0156] Specifically, the flow path of the cooling oil at the oil baffle ring 43 is as follows: oil outlet of the outer iron core oil passage 411, first oil storage chamber 44, oil slinger, and second oil storage chamber 45.

[0157] Please see Figure 1 In some possible embodiments, the inner rotor assembly 2 has a first output end 223 extending axially out of the motor housing 1; the outer rotor assembly 4 has a second output end 422 extending out of the motor housing 1; the second output end 422 extends out of the motor housing 1 in the same direction as the first output end 223, and the second output end 422 is rotatably connected to the outside of the first output end 223.

[0158] In this embodiment, the power output of the inner rotor assembly 2 is realized by setting a first output terminal 223, and the power output of the outer rotor assembly 4 is realized by setting a second output terminal 422. By making the first output terminal 223 and the second output terminal 422 extend out of the motor housing 1 in the same direction, the space occupied by the motor in the axial direction is saved, which is beneficial to improving the integration and power density of the motor.

[0159] Specifically, the inner rotor shaft 22 of the inner rotor assembly 2 extends from one side of the motor housing 1, so that the extended end of the inner rotor shaft 22 forms the first output end 223 mentioned above; the outer rotor bracket 42 of the outer rotor assembly 4 is sleeved on the inner rotor shaft 22 and extends on the same side as the inner rotor shaft 22, so that the extended end of the outer rotor bracket 42 forms the second output end 422 mentioned above. The inner rotor shaft 22 and the outer rotor bracket 42 form a coaxial nested dual output structure, which is conducive to realizing the independent output or coaxial coupling of the inner and outer rotor power, and has the advantages of compact structure, simplified support and flexible operation mode.

[0160] Furthermore, a first bearing 5 is provided between the inner rotor shaft 22 and the outer rotor support 42, and a second bearing 6 is provided between the outer rotor support 42 and the motor housing 1. The first bearing 5 and the second bearing 6 are used to ensure the rotation of the inner rotor shaft 22 and the outer rotor support 42; a first seal 7 is provided between the inner rotor shaft 22 and the outer rotor support 42, and a second seal 8 is provided between the outer rotor support 42 and the motor housing 1. The first seal 7 and the second seal 8 are used to prevent the cooling oil from leaking out of the receiving cavity 12.

[0161] It should be noted that the bearing structure used in this application only includes the first bearing 5 and the second bearing 6, as well as the rotating bearing set between the inner rotor shaft 22 and the motor housing 1. That is to say, only three sets of bearing structures are set. Compared with the structure of multiple bearings and connecting housings in the traditional technology, the number of bearing structures and connecting housings can be reduced, which is conducive to achieving the lightweighting of the motor.

[0162] Please see Figure 2 In some embodiments, the stator core 31 includes an inner stator core 311 and an outer stator core 312 that are disposed and fixed together. The winding assembly 32 includes an inner layer winding 321 wound on the inner stator core 311 and an outer layer winding 322 wound on the outer stator core 312. The oil outlet of the stator oil passage 35 includes a first oil injection hole 351 and a second oil injection hole 352. The first oil injection hole 351 is disposed toward the inner peripheral wall of the outer layer winding 322, and the second oil injection hole 352 is disposed toward the outer peripheral wall of the inner layer winding 321.

[0163] In this embodiment, an inner stator core 311 and an outer stator core 312 are provided to correspondingly wind the inner layer winding 321 and the outer layer winding 322, thereby making the inner stator core 311 and the inner layer winding 321 correspond to the inner rotor assembly 2, and the outer stator core 312 and the outer layer winding 322 correspond to the outer rotor assembly 4. Furthermore, the oil outlet end of the stator oil passage 35 is provided with a first oil injection hole 351 and a second oil injection hole 352 facing the peripheral wall of the corresponding winding group 32 extension end, which can realize the corresponding cooling of the outer peripheral wall of the inner layer winding 321 and the inner peripheral wall of the outer layer winding 322, thereby improving the cooling effect of the winding group 32.

[0164] Please see Figures 14 to 15 For example, a connector 33 is provided inside the stator core 31 of the stator assembly 3. The two ends of the connector 33 extend out of the stator core 31 and are respectively connected to an oil guide ring 34. Each oil guide ring 34 has a first oil spray hole 351 on its radially outer side and a second oil spray hole 352 on its radially inner side. The protruding end of the inner winding 321 is placed inside the oil guide ring 34, and the protruding end of the outer winding 322 is placed outside the oil guide ring 34, so that the first oil spray hole 351 guides the cooling oil to the inner wall of the protruding end of the outer winding 322, and the second oil spray hole 352 guides the cooling oil to the outer wall of the protruding end of the inner winding 321.

[0165] For example, there are multiple first injection holes 351, which are spaced apart circumferentially along the oil guide ring 34; there are multiple second injection holes 352, which are spaced apart circumferentially along the oil guide ring 34.

[0166] Furthermore, the cooling oil flowing out of the inner rotor oil circuit flows directly onto the inner peripheral wall of the extended end of the inner winding 321, and the cooling oil flowing out of the outer rotor oil circuit flows directly onto the outer peripheral wall of the extended end of the outer winding 322.

[0167] It should be understood that the motor provided in this application can guide the cooling oil at the oil inlet passage 11 to the stator oil passage 35 and the inner rotor oil passage respectively. The cooling oil in the stator oil passage 35 can mainly cool the stator assembly 3, and the cooling oil in the inner rotor oil passage can cool the inner rotor assembly 2. The cooling oil at the oil outlet of the stator oil passage 35 and the oil outlet of the inner rotor oil passage can be thrown into the rotor cavity after being thrown. The cooling oil in the rotor cavity can be guided to the outer rotor oil passage to cool the outer rotor assembly 4. The cooling oil after cooling the outer rotor assembly 4 and the cooling oil after cooling the inner rotor assembly 2 can be thrown to the winding group 32 of the stator assembly 3 to provide auxiliary cooling for the winding group 32, so as to achieve the cooling of the outer rotor assembly 4, the stator assembly 3 and the inner rotor assembly 2 inside the motor housing 1, that is, to achieve targeted cooling of the internal heat-generating components, thereby achieving the purpose of fully cooling the motor.

[0168] Based on the same inventive concept, this application also provides a vehicle that includes the aforementioned motor.

[0169] The vehicle provided in this application, having included the aforementioned motor, possesses all the beneficial effects of the aforementioned motor, optimizing the internal cooling structure of the motor, improving the motor cooling effect, and maintaining the stability and reliability of the motor operation.

[0170] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electric motor, characterized in that, include: The motor housing (1) has an internal cavity (12); the motor housing (1) is provided with an oil inlet passage (11); The stator assembly (3) is placed in the receiving cavity (12) and fixed to the motor housing (1); the stator assembly (3) includes a stator core (31), on which a winding group (32) is wound, with both ends of the winding group (32) extending out of the stator core (31); the stator assembly (3) is provided with a stator oil passage (35); The rotor assembly is placed inside the receiving cavity (12) and has an inner and outer sleeve structure with the stator assembly (3); the rotor assembly is provided with a rotor oil passage; The oil inlet of the rotor oil circuit and the oil inlet of the stator oil circuit (35) are respectively connected to the oil inlet passage (11); the oil outlet of the stator oil circuit (35) faces the extension end of the winding assembly (32) to guide the cooling oil to the extension end of the winding assembly (32); the oil outlet of the rotor oil circuit faces the extension end of the winding assembly (32) to throw the cooling oil to the extension end of the winding assembly (32).

2. The motor as described in claim 1, characterized in that, The rotor assembly includes: The inner rotor assembly (2) is placed inside the stator assembly (3) and is rotatably connected to the motor housing (1); the inner rotor assembly (2) is provided with an inner rotor oil passage; The outer rotor assembly (4) is sleeved on the outside of the stator assembly (3) and rotatably connected to the motor housing (1); the outer rotor assembly (4) is provided with an outer rotor oil passage; The rotor oil circuit includes the inner rotor oil circuit and the outer rotor oil circuit; the oil outlet of the inner rotor oil circuit faces the inner peripheral wall of the extended end of the winding assembly (32), and the oil outlet of the outer rotor oil circuit faces the outer peripheral wall of the extended end of the winding assembly (32), so as to correspondingly throw the cooling oil onto the inner and outer peripheral walls of the extended end of the winding assembly (32).

3. The motor as described in claim 2, characterized in that, The inner rotor assembly (2) includes an inner core assembly (21) placed inside the stator core (31). The inner rotor assembly (2) has two oil outlets, which are respectively located at the two axial ends of the inner core assembly (21). In the stator core (31), the two axially extending ends of the winding group (32) are respectively located on both sides of the inner core assembly (21), and the oil outlets of the two inner rotor assemblies (2) are correspondingly thrown to the inner peripheral walls of the two winding group (32) extension ends.

4. The motor as described in claim 3, characterized in that, The inner rotor assembly (2) further includes an inner rotor shaft (22) rotatably connected to the motor housing (1); the inner core assembly (21) is arranged around and fixed on the inner rotor shaft (22); The inner rotor shaft (22) is provided with a first oil passage, the oil inlet end of the first oil passage is connected to the oil inlet passage (11), and the inner core assembly (21) is provided with two sets of second oil passages, the oil outlet end of the first oil passage and the oil inlet ends of the two sets of second oil passages are respectively connected to form the inner rotor oil passage.

5. The motor as described in claim 4, characterized in that, Both sets of the second oil circuits are Z-shaped oil circuits; the oil inlet ends of the two sets of the second oil circuits are spaced apart along the axial direction of the inner rotor shaft (22), and the oil outlet ends are respectively located at both ends of the axial direction of the inner core assembly (21), so that the Z-shaped opening directions of the two Z-shaped oil circuits are opposite.

6. The motor as described in claim 5, characterized in that, The inner core assembly (21) includes: The inner rotor core (211) has four axially connected core oil passages. The four core oil passages are arranged in pairs, with two core oil passages in each pair being axially spaced apart. The two sets of core oil passages are circumferentially spaced apart along the inner rotor core (211). Each set of core oil passages is used to cool the magnets in a corresponding set of magnet slots. A first end plate (212) is provided at one end of the inner rotor core (211); the first end plate (212) is provided with a first connecting oil passage (2121) extending circumferentially thereon and a first oil throwing passage (2122) extending radially thereon; the first oil throwing passage (2122) extends radially through the first end plate (212) to the outer peripheral wall of the first end plate (212), so that the through end of the first oil throwing passage (2122) forms an oil outlet end of the inner rotor assembly (2); A second end plate (213) is provided at the other end of the inner rotor core (211); the second end plate (213) is provided with a second connecting oil passage (2131) extending circumferentially thereon and a second oil throwing passage (2132) extending radially thereon; the second oil throwing passage (2132) extends radially through the second end plate (213) to the outer peripheral wall of the second end plate (213), so that the through end of the second oil throwing passage (2132) forms another oil outlet end of the inner rotor assembly (2); The first connecting oil passage (2121) is connected to two of the iron core oil passages in one group respectively, and one of the two iron core oil passages in the same group connected by the first connecting oil passage (2121) is connected to the first oil passage and the other is connected to the second sling oil passage (2132) to form a second oil passage. The second connecting oil passage (2131) is connected to two iron core oil passages in another group respectively, and one of the two iron core oil passages in the same group connected by the second connecting oil passage (2131) is connected to the first oil passage, and the other is connected to the first sling oil passage (2122) to form another second oil passage.

7. The motor as described in claim 6, characterized in that, The magnetic steel grooves in the same group are specifically a first magnetic steel groove (2113) and a second magnetic steel groove (2114), both of which have a V-shaped structure; The two core oil circuits in the same group are specifically the first core oil circuit (2111) and the second core oil circuit (2112). The first core oil circuit (2111) includes branch oil circuits (21112) that are distributed in a V-shape, and the second core oil circuit (2112) also has a V-shaped structure. In the radial direction of the inner rotor core (211), the branch oil passage (21112), the first magnet slot (2113), the second core oil passage (2112) and the second magnet slot (2114) are adjacent to each other and spaced apart from the inside out.

8. The motor as described in claim 7, characterized in that, The first iron core oil circuit (2111) also includes: The oil storage chamber (21111) is arranged to pass through the inner rotor core (211) along the axial direction and is connected to the branch oil passage (21112); The oil storage chamber (21111) is connected to the first oil passage via a radially extending connecting oil passage (2115) at one axial end.

9. The motor as described in claim 8, characterized in that, The inner rotor shaft (22) has an inner axial oil passage (221) that communicates with the oil inlet passage (11), and two sets of inner radial oil passages (222) that are respectively communicated with the inner axial oil passage (221); wherein, the two sets of inner radial oil passages (222) are distributed at intervals along the axial direction of the inner rotor shaft (22) and are connected to the two sets of second oil passages in a one-to-one correspondence; the first oil passage includes the inner axial oil passage (221) and the two sets of inner radial oil passages (222).

10. The motor as described in claim 2, characterized in that, The outer rotor assembly (4) has a rotor cavity that partially covers the stator assembly (3) and the inner rotor assembly (2); The cooling oil at the outlet end of the stator oil circuit (35) is guided to the protruding end of the winding assembly (32) and then partially enters the rotor cavity. The cooling oil at the outlet end of the inner rotor oil circuit is thrown to the protruding end of the winding assembly (32) and then partially enters the rotor cavity. The oil inlet end of the outer rotor oil passage is connected to the rotor cavity. The cooling oil provided by the oil inlet passage (11) enters the rotor cavity through the stator oil passage (35) and / or the inner rotor oil passage, and then enters the outer rotor oil passage under the action of the centrifugal force of the outer rotor assembly (4).

11. The motor as described in claim 10, characterized in that, The external rotor assembly (4) includes: An outer rotor core (41) is arranged around the stator assembly (3); the outer rotor core (41) has an outer core oil passage (411) that runs through it along its axial direction. An outer rotor support (42) is sleeved and fixed outside the outer rotor core (41); the outer rotor support (42) has an oil guide (421) opposite to one through end of the oil passage (411) of the outer core; An oil baffle ring (43) is disposed between the outer rotor support (42) and the stator assembly (3), and is opposite to the other through end of the outer core oil passage (411); The cooling oil in the rotor cavity is used to enter the outer core oil passage (411) from the oil guide (421) and flow through the oil baffle ring (43) to the corresponding extended end of the winding group (32).

12. The motor as described in claim 11, characterized in that, The oil guide section (421) includes a plurality of oil guide grooves inclined toward the outer iron core oil passage (411), and the plurality of oil guide grooves are distributed at intervals along the circumference of the outer rotor support (42).

13. The motor as described in claim 11, characterized in that, A first oil storage chamber (44) is provided between the oil baffle ring (43), the end wall of the outer rotor core (41), and the outer rotor support (42). The first oil storage chamber (44) is connected to the oil outlet end of the outer core oil passage (411). The cooling oil in the first oil storage chamber (44) is used to cool the end of the outer rotor core (41). A second oil storage chamber (45) is provided between the oil baffle ring (43) and the outer peripheral wall of the extended end of the winding assembly (32). The second oil storage chamber (45) is connected to the first oil storage chamber (44). The cooling oil in the second oil storage chamber (45) is used to cool the outer peripheral wall of the extended end of the winding assembly (32). The outer rotor oil circuit includes the outer iron core oil circuit (411), the first oil storage chamber (44), and the second oil storage chamber (45).

14. The motor as described in claim 2, characterized in that, The inner rotor assembly (2) has a first output end (223) extending axially from the motor housing (1); the outer rotor assembly (4) has a second output end (422) extending from the motor housing (1); the second output end (422) extends from the motor housing (1) in the same direction as the first output end (223), and the second output end (422) is rotatably connected to the outside of the first output end (223).

15. The motor as described in claim 1, characterized in that, The stator core (31) includes an inner stator core (311) and an outer stator core (312) that are disposed and fixed together. The winding assembly (32) includes an inner winding (321) wound on the inner stator core (311) and an outer winding (322) wound on the outer stator core (312). The stator oil passage (35) has an oil outlet end including a first oil injection hole (351) and a second oil injection hole (352). The first oil injection hole (351) is disposed toward the inner peripheral wall of the outer winding (322), and the second oil injection hole (352) is disposed toward the outer peripheral wall of the inner winding (321).

16. A vehicle, characterized in that, Including the motor as described in any one of claims 1-15.

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