Motor assembly

Abstract

The motor assembly comprises a shell, a stator assembly and a rotor, the rotor is sleeved with the stator assembly, the shell is arranged on the periphery of the stator assembly, and a cooling cavity is formed between the shell and the stator assembly; the stator assembly comprises a stator, windings and an insulation structure, the stator is provided with a plurality of first mounting grooves distributed in the circumferential direction, the insulation structure is provided with a plurality of insulation plates distributed at intervals in the circumferential direction, the insulation plates are connected into the first mounting grooves in a one-to-one correspondence mode, each insulation plate is provided with a second mounting groove, and the windings comprise multiple layers. The multiple layers of windings are distributed in each second installation groove in the radial direction, a first cooling flow channel is formed between every two adjacent windings in the radial direction, cooling liquid enters the cooling cavity from one end of the shell and flows to the other end of the stator assembly in the axial direction from one end of the stator assembly in the axial direction through each first cooling flow channel, and uniform cooling of the multiple layers of windings is achieved. The problem that windings of different levels are heated unevenly is solved.

Description

Technical Field

[0001] This invention relates to the field of motor cooling technology, and more particularly to a motor assembly. Background Technology

[0002] Immersion-cooled motors, by immersing the stator in coolant, rely on the efficient heat transfer characteristics of the coolant to absorb and remove the heat generated during motor operation, which is an important technical approach to improve the thermal management efficiency of motors. In some existing technologies, although oil channels are opened in the stator core to achieve core cooling and oil channels are set at the bottom or opening of the stator slots to specifically cool the windings, the coolant is difficult to penetrate to all layers of the windings, resulting in uneven heating of different layers of windings, which leaves room for improvement. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a motor assembly in which the insulation structure of the motor assembly is provided with a plurality of second mounting slots, each second mounting slot is provided with multiple layers of radially distributed windings, and a first cooling channel is formed between adjacent windings, which allows coolant to flow from one end of the stator assembly in the axial direction to the multiple first cooling channels and then to the other end in the axial direction, thereby achieving uniform cooling of the multiple layers of windings and solving the problem of uneven heating of different layers of windings.

[0004] According to an embodiment of the present invention, a motor assembly includes: a housing, a stator assembly, and a rotor. The stator assembly is sleeved on the rotor. The housing is disposed on the outer periphery of the stator assembly and forms a cooling cavity between the housing and the stator assembly. The stator assembly includes a stator, windings, and an insulation structure. The stator has a plurality of circumferentially distributed first mounting slots. The insulation structure has a plurality of circumferentially spaced insulation plates. The plurality of insulation plates are connected one-to-one in the plurality of first mounting slots. Each insulation plate has a second mounting slot. The windings include multiple layers. The multiple layers of windings are radially distributed in each of the second mounting slots. A first cooling channel is formed between radially adjacent windings. Coolant enters the cooling cavity from one end of the housing and flows from one axial end of the stator assembly through each of the first cooling channels to the other axial end.

[0005] According to an embodiment of the present invention, the motor assembly has a plurality of circumferentially distributed second mounting slots in the insulation structure between the stator and the windings. Each second mounting slot has multiple layers of radially distributed windings, and a first cooling channel is formed between adjacent windings in the radial direction. This allows the coolant to flow from one end of the stator assembly in the axial direction to the multiple first cooling channels and then to the other end in the axial direction, thereby achieving uniform cooling of the multiple layers of windings and solving the problem of uneven heating of different winding levels.

[0006] According to an embodiment of the present invention, each of the insulating plates is provided with a plurality of support plates distributed radially at intervals, and a cooling sub-cavity is formed between adjacent support plates. Each support plate is provided with a central through hole communicating with the adjacent cooling sub-cavities. A first cooling channel extending axially is formed between the windings of adjacent layers in the radial direction at the central through hole. The second mounting groove is provided with a first protrusion and a second protrusion at both ends in the radial direction of the stator, respectively, protruding away from each other. The first protrusion and the second protrusion form end cooling channels between the windings of the corresponding layers. The coolant flows from one end of the stator assembly in the axial direction through the first cooling channel and the end cooling channel to the other end in the axial direction.

[0007] According to an embodiment of the present invention, each of the cooling sub-cavities is provided with side sub-slots on two inner sidewalls along the stator circumference, and each side sub-slot forms a side cooling flow channel between itself and the winding of the corresponding layer.

[0008] According to an embodiment of the present invention, the stator further includes a plurality of circumferentially distributed second cooling channels, the second cooling channels being located on the side of the first cooling channel radially away from the center of the stator.

[0009] According to an embodiment of the present invention, the motor assembly further includes an end plate portion, the end plate portion being constructed as a ring structure, a plurality of circumferentially distributed insulating plates being connected to the end plate portion, the plurality of insulating plates being inserted into a plurality of first mounting slots of the stator and causing the stator to contact the end plate portion axially, the end plate portion being provided with a plurality of circumferentially spaced liquid collecting cavities, each of the liquid collecting cavities being provided with a spray hole, the coolant in each of the second cooling channels flowing to the corresponding liquid collecting cavity and being sprayed out through the spray hole.

[0010] According to an embodiment of the present invention, in the motor assembly, each of the liquid collection chambers is located between two adjacent first mounting slots.

[0011] According to an embodiment of the present invention, each second cooling channel includes a plurality of interconnected second sub-channels, the plurality of second sub-channels being distributed axially and partially offset circumferentially.

[0012] According to an embodiment of the present invention, in the motor assembly, at least a portion of the plurality of second sub-channels of each second cooling channel are also partially offset radially from the stator.

[0013] According to an embodiment of the present invention, the motor assembly includes a housing body, an end cap, and an immersion cover. One end of the housing body is connected to the end cap. The end cap has a snap-fit ​​groove on its side facing inward of the housing body. The immersion cover is snapped into the snap-fit ​​groove. The immersion cover has a coolant reservoir. The snap-fit ​​groove has a housing inlet. The coolant reservoir has a cover inlet. The housing inlet and the cover inlet are opposite to and communicate with each other. The end of the housing body away from the end cap has a housing outlet.

[0014] According to an embodiment of the present invention, the inner circumference of the housing body is provided with a limiting stop, and the insulating structure is installed on the inner circumference of the housing body and is axially limited by the limiting stop.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the motor assembly according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the burst structure of the motor assembly according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the stator structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the first mounting groove on the inner circumference of the stator according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the insulation structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the insulating plate according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the multilayer winding of the present invention, which forms multiple first cooling channels and two end cooling channels within the insulating plate. Figure 8 This is a schematic diagram of the structure of multiple second cooling channels distributed circumferentially within the stator according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of each second cooling channel in an embodiment of the present invention, which includes multiple second sub-channels; Figure 10 This is a schematic diagram of the end plate portion of the insulation structure facing the insulation plate in an embodiment of the present invention; Figure 11 This is a schematic diagram of the connection relationship between the stator and windings in an embodiment of the present invention; Figure 12 This is a cross-sectional structural schematic diagram of the motor assembly according to an embodiment of the present invention; Figure 13 This is a schematic diagram of the structure where the end cap and the immersion cover of the housing burst open in an embodiment of the present invention; Figure 14 This is a schematic diagram of the structure of the shell body of the present invention having a limiting stop on the inner periphery.

[0017] Reference numerals: Motor assembly 100, Housing 1, Cooling chamber 10, Housing body 11, Housing outlet 111, Limiting stop 112, Through hole 113, End cover 12, Housing inlet 121, Snap-fit ​​groove 122, Inner peripheral wall 123, Stop ring 124, Mounting hole 125, Immersion cover 13, Cover inlet 131, Coolant reservoir 132, Winding 2, Insulation structure 3, Insulation plate 31, Support plate 311, Through hole 312, Side Sub-slot 313, first protrusion 314, second protrusion 315, second mounting slot 316, cooling sub-cavity 3161, end plate 32, liquid collection cavity 322, liquid spray hole 3221, second mounting slot facing cavity 323, stator 4, first mounting slot 41, third protrusion 411, fourth protrusion 412, second cooling channel 42, second sub-channel 421, rotor 5, reducer shaft 6, first cooling channel 7, end cooling channel 8, side cooling channel 9. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not 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 the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] The following is for reference. Figures 1-14 According to an embodiment of the present invention, a motor assembly 100 is provided in which an insulating structure 3 between the stator 4 and the winding 2 is provided with a plurality of second mounting slots 316. Each second mounting slot 316 is provided with multiple layers of radially distributed windings 2, and a first cooling channel 7 is formed between adjacent layers of windings 2. Coolant can flow from one end of the stator assembly in the axial direction to the plurality of first cooling channels 7 and then to the other end, so as to achieve uniform cooling of the multiple layers of windings 2 and solve the problem of uneven heating of different layers of windings 2.

[0021] like Figure 1-14 As shown, a motor assembly 100 according to an embodiment of the present invention includes: a housing 1, a stator assembly and a rotor 5, the stator assembly being sleeved on the rotor 5, and the housing 1 being disposed on the outer periphery of the stator assembly and forming a cooling cavity 10 between the housing 1 and the stator assembly.

[0022] The stator assembly includes a stator 4, windings 2, and an insulation structure 3. The stator 4 is provided with multiple circumferentially distributed first mounting slots 41. The insulation structure 3 is provided with multiple circumferentially spaced insulation plates 31. The multiple insulation plates 31 are connected one-to-one in the multiple first mounting slots 41. Each insulation plate 31 is provided with a second mounting slot 316. The windings 2 include multiple layers. The multiple layers of windings 2 are radially distributed in each second mounting slot 316. A first cooling channel 7 is formed between adjacent windings 2 in the radial direction. Coolant enters the cooling chamber 10 from one end of the housing 1 and flows from one axial end of the stator assembly through each first cooling channel 7 to the other axial end.

[0023] In practice, the electromagnetic induction between the stator winding 2 and the rotor 5 generates a rotating magnetic field, thereby enabling the operation of the motor assembly 100. The winding 2 is generally made of conductive materials such as enameled wire and is the core of electromagnetic energy conversion. After three-phase alternating current is applied, it generates a rotating magnetic field, driving the rotor 5 to rotate. The insulation structure 3 is generally made of heat-resistant insulating materials such as plastic or epoxy resin, which isolates the winding 2 from the stator 4 to prevent short circuits or leakage.

[0024] When the motor assembly 100 is running, the winding 2 will generate a lot of heat due to the current heating effect, so the winding 2 needs to be cooled to ensure the safety of the winding 2; the housing 1 is located on the outer periphery of the stator assembly and forms a cooling cavity 10 between the housing 1 and the stator assembly, and cooling oil can be injected into the cooling cavity 10 to cool the winding 2.

[0025] Specifically, the stator 4 has multiple spaced first mounting slots 41 circumferentially distributed, extending radially. The insulation structure 3 includes multiple circumferentially distributed insulation plates 31, each corresponding to one of the first mounting slots 41. Each insulation plate 31 has a second mounting slot 316, within which a winding 2 is installed. The winding 2 includes multiple layers of winding 2, distributed radially along the stator 4 within each insulation plate 31. Adjacent layers of winding 2 form first cooling channels 7. Cooling oil can enter the multiple first cooling channels 7 from one axial end of the stator 4 and exit from the other axial end of the stator assembly, thereby cooling the multiple layers of winding 2 and ensuring uniform cooling of the winding 2. (Refer to...) Figure 11 As shown, the winding 2 extends from both ends of the stator 4 along the axial direction of the stator 4, and the first cooling channel 7 extends and passes through the stator 4 along the axial direction of the stator 4, thereby realizing that the coolant flows from one end of the stator 4 along the axial direction to the other end, so as to achieve better cooling of both ends of the winding 2 along the axial direction of the stator 4.

[0026] Therefore, the embodiments of the present invention can achieve cooling of each layer of winding 2 in the multilayer winding 2, and can effectively cool both ends of the winding 2, thereby achieving uniform cooling of the winding 2 and improving the cooling effect.

[0027] In some embodiments, refer to Figure 6 and Figure 7 As shown, each insulating plate 31 is provided with multiple support plates 311 distributed radially at intervals. A cooling sub-cavity 3161 is formed between adjacent support plates 311. Each support plate 311 is provided with a central through hole 312 connecting adjacent cooling sub-cavities 3161. A first cooling channel 7 extending axially is formed between the windings 2 of adjacent layers in the radial direction at the central through hole 312. The second mounting groove 316 is provided with a first protrusion 314 and a second protrusion 315 protruding away from each other at both ends of the stator 4 in the radial direction. The first protrusion 314 and the second protrusion 315 form an end cooling channel 8 between the windings 2 of the corresponding layers. The coolant flows from one end of the stator assembly in the axial direction through the first cooling channel 7 and the end cooling channel 8 to the other end in the axial direction.

[0028] In other words, each insulating plate 31 is provided with multiple cooling sub-cavities 3161 distributed radially, and each layer of winding 2 is connected to a cooling sub-cavity 3161 so that the multiple layers of winding 2 are distributed at equal distances along the radial direction of the stator 4. The support plate 311 is used to support each layer of winding 2 and to separate two adjacent layers of winding 2. The support plate 311 is provided with a central through hole 312 in the middle, so that the multiple layers of winding 2 in each insulating plate 31 are correspondingly arranged behind multiple cooling sub-cavities 3161. A first cooling channel 7 is formed between two adjacent layers of winding 2. Thus, when the cooling oil in the cooling cavity 10 in the housing 1 and the stator assembly flows from one end of the stator assembly to the other end, it can circulate through multiple axially extending first cooling channels 7. That is, the coolant can cool each layer of winding 2, thereby improving the uniformity of cooling of the winding 2.

[0029] Furthermore, the second mounting groove 316 has a first protrusion 314 and a second protrusion 315 protruding away from each other at both ends radially along the insulating structure 3, so refer to Figure 7 As shown, an end cooling channel 8 is formed between the inner wall of the first protrusion 314 and the winding 2 on the corresponding side, and another end cooling channel 8 is formed between the inner wall of the second protrusion 315 and the winding 2 on the corresponding side. Thus, when the coolant flows from one end of the stator assembly to the other end in the axial direction, part of the coolant also flows from one end of the end cooling channel 8 to the other end in the axial direction. The two end cooling channels 8 in each insulating plate 31 can cool the inner surface of the inner layer winding 2 and the outer surface of the outer layer winding 2, respectively. The inner layer winding 2 can be the end close to the center of the stator 4, and the outer layer winding 2 can be the end away from the center of the stator 4. Combined with the arrangement of multiple first cooling channels 7, cooling can be achieved on both sides of each layer winding 2 in the radial direction, thereby improving the uniformity of cooling of the multi-layer winding 2.

[0030] Furthermore, it should be noted that each insulating plate 31 has a first protrusion 314 at one end and a second protrusion 315 at the other end in the radial direction. Simultaneously, the first mounting groove 41 of the stator 4 has a third protrusion 411 at one end and a fourth protrusion 412 at the other end in the radial direction. When the insulating plate 31 is inserted into the first mounting groove 41, the first protrusion 314 and the third protrusion 411 cooperate, and the second protrusion 315 and the fourth protrusion 412 cooperate, achieving a reliable connection between the insulating plate 31 and the first mounting groove 41 of the stator 4. At the same time, the arrangement of the first protrusion 314 and the second protrusion 315 on the insulating plate 31, and the third protrusion 411 and the fourth protrusion 412 on the stator 4, can form an end cooling channel 8, thereby facilitating the cooling of the outer side of the outer layer winding 2 and the inner side of the inner layer winding 2 in the radial direction. This allows each winding 2 to be cooled on both radially sides, improving the cooling efficiency and uniformity of the winding 2.

[0031] In other words, the cooling oil flowing through each insulating plate 31 can be guided to the output end of the winding 2 through the end cooling channel 8, the side cooling channel 9 and multiple first cooling channels 7, naturally forming a spraying effect on each layer and surface of the end winding 2, and simultaneously achieving heat dissipation of the end winding 2.

[0032] In some embodiments, each cooling sub-cavity 3161 is provided with two inner sidewalls along the circumference of the stator 4, and each side sub-cavity 313 forms a side cooling channel 9 between itself and the winding 2 of the corresponding layer.

[0033] Reference Figure 6 As shown, each cooling sub-cavity 3161 of each insulating plate 31 has a side sub-groove 313 on both inner walls along the circumferential direction of the stator assembly, and the two side sub-grooves 313 in each cooling sub-cavity 3161 are circumferentially opposite each other, referring to... Figure 7 As shown, when multiple radially distributed multilayer windings 2 are installed in each insulating plate 31, each winding 2 faces the side sub-slots 313 on both sides of the stator 4 in the circumferential direction, and defines a side cooling channel 9 between the winding 2 and the side sub-slots 313. Each side cooling channel 9 extends along the axial direction of the stator 4. That is to say, when the coolant flows from one end to the other end along the axial direction of the stator assembly, it can flow not only from multiple first cooling channels 7 to the other end in the axial direction, but also from multiple end cooling channels 8 to the other end in the axial direction, and also from the side cooling channel 9 to the other end in the axial direction. This achieves cooling on all four sides of each winding 2, further improving the cooling effect and the uniformity of cooling.

[0034] In some embodiments, the stator 4 further includes a plurality of circumferentially distributed second cooling channels 42, the second cooling channels 42 being located on the side of the first cooling channel 7 that is radially away from the center of the stator 4.

[0035] Reference Figure 3 and Figure 8 As shown, multiple circumferentially spaced second cooling channels 42 of the stator 4 extend axially. Each second cooling channel 42 can penetrate from one end of the stator 4 to the other end in the axial direction. Thus, when the coolant flows from one end of the stator assembly to the other end in the axial direction, it can also flow from one end to the other end in the axial direction along the second cooling channel 42, thereby achieving heat dissipation of the stator 4. Furthermore, the coolant flowing out from the end of the stator 4 in the axial direction can also cool the end of the winding 2, which improves the cooling effect on the end of the winding 2 along the axial direction of the stator 4. In other words, the oil in this embodiment of the invention can not only uniformly cool the winding 2, but also cool the stator 4, achieving synergistic heat dissipation.

[0036] In some embodiments, the insulation structure 3 further includes an end plate portion 32, which is constructed as a ring structure. Multiple circumferentially distributed insulation plates 31 are connected to the end plate portion 32. The multiple insulation plates 31 are inserted into multiple first mounting slots 41 of the stator 4, and the stator 4 and the end plate portion 32 are in axial contact. The end plate portion 32 is provided with multiple circumferentially spaced liquid collection chambers 322. Each liquid collection chamber 322 is provided with a spray hole 3221. The coolant in each second cooling channel 42 flows to the corresponding liquid collection chamber 322 and is sprayed out through the spray hole 3221.

[0037] In practice, refer to Figure 10 As shown, the end plate 32 and multiple insulating plates 31 are integrally molded using injection molding. The insulating plates 31 can replace the insulating paper in the traditional stator 4, ensuring insulation performance while solving the problem of uneven cooling of the winding 2 through structural design. The cross-section of the end plate 32 facing the stator 4 is shown in the figure. Figure 10 As shown, the end plate portion 32 includes a plurality of circumferentially spaced liquid collecting chambers 322. Each liquid collecting chamber 322 gradually narrows radially from a position away from the center of the end plate portion 32 to a position close to the center of the end plate portion 32. This causes a pressure change in the liquid collecting chamber 322 after the oil flows into the second cooling channel 42. The pressure is higher at the radial position of the liquid collecting chamber 322 close to the center of the end plate portion 32, which allows the oil to be smoothly sprayed out from the spray hole 3221, thereby cooling the end of the winding 2.

[0038] Furthermore, each liquid collection chamber 322 is provided with at least two spray holes 3221. If the two spray holes 3221 are distributed radially and spaced apart along each liquid collection chamber 322, the coolant in each second cooling channel 42 can flow into each corresponding liquid collection chamber 322 and be sprayed out from the two spray holes 3221 of each liquid collection chamber 322, thereby improving the oil injection efficiency and achieving efficient cooling of the end of the winding 2.

[0039] In some embodiments, each collection chamber 322 is located between two adjacent second mounting slots 316. Continuing to refer to... Figure 10As shown, the end plate portion 32 is provided with multiple second mounting groove facing cavities 323 corresponding one-to-one with the second mounting grooves 316. The end of each liquid collecting cavity 322 facing radially upwards towards the center of the end plate portion 32 is located between two adjacent second mounting groove facing cavities 323. That is, the end of each liquid collecting cavity 322 facing radially upwards towards the center of the end plate portion 32 is located between two adjacent second mounting grooves 316. This allows the oil in the liquid collecting cavity 322 to cool the stator 4 while simultaneously focusing and precisely spraying the oil in the liquid collecting cavity 322 onto the ends of the windings 2 in the adjacent circumferential insulating plate 31, achieving multi-directional cooling of the windings 2 and thus improving the cooling effect on the windings 2. Furthermore, the spray holes 3221 are located between two adjacent second mounting grooves 316, which can enhance the cooling of the winding ends 2 by the oil in the area between the two second mounting grooves 316 and compensate for any missing coolant spraying in the second mounting grooves 316 within the insulating plate 31.

[0040] In other words, the end plate portion 32 is designed to allow oil to be sprayed out along the end plate portion 32 to cool the end of the winding 2, thereby enabling the oil to flow from one end of the stator assembly axially to the other end, achieving all-round cooling of the winding 2, improving the uniformity of cooling of the winding 2, and also improving the cooling effect of the winding 2. Figure 10 In the middle, multiple spray holes 3221 far from the center of the end plate 32 form a ring of spray holes 3221 arranged circumferentially, and multiple spray holes 3221 near the center of the end plate 32 form another ring of spray holes 3221 arranged circumferentially. The ring of spray holes 3221 near the center of the end plate 32 is the inner ring of spray holes 3221. This means that the distance between adjacent spray holes 3221 in the inner ring is shorter and the distribution is more dense, while the distance between adjacent spray holes 3221 in the outer ring is farther and the distribution is sparser. This distribution brings two advantages. First, it can distribute more cooling oil to the side near the center of the end plate 32 to achieve a spraying effect. Second, it can reduce the overall flow rate on the side far from the center of the end plate 32.

[0041] In some embodiments, each second cooling channel 42 includes a plurality of connected second sub-channels 421, which are distributed axially and partially offset circumferentially.

[0042] Reference Figure 8 As shown, each second cooling channel 42 extends from one end to the other along the axial direction of the stator assembly, and each second cooling channel 42 includes a plurality of second sub-channels 421 distributed along the axial direction. Figure 8Each rectangular block represents a second sub-channel 421. Two adjacent small blocks in the axial direction are connected, and the multiple small blocks in each second cooling channel 42 are slightly staggered in the circumferential direction. This can reduce the flow rate of the cooling oil in the second cooling channel 42, thereby increasing the level of oil entering the internal cooling chamber 10 from the axially upward end of the housing 1. This reduces the possibility of insufficient oil filling in the cooling chamber 10. Furthermore, the axially staggered design can disrupt the laminar flow state of the coolant, generating a turbulence effect, further enhancing the heat exchange effect and improving the heat dissipation effect.

[0043] In some embodiments, at least a portion of the plurality of second sub-channels 421 of each second cooling channel 42 are also partially offset radially from the stator 4.

[0044] Specifically, the multiple second sub-channels 421 in each second cooling channel 42 can be radially arranged in a stepped pattern, such as... Figure 9 As shown, the multiple second sub-channels 421 can gradually rise radially from one end of the stator 4 to the other, or gradually decrease radially from one end of the stator 4 to the other. Alternatively, the multiple second sub-channels 421 in each second cooling channel 42 can be arranged in a manner that first rises and then decreases from one end of the stator 4 to the other. Through this stepped structure, the contact area between the cooling oil and the stator 4 can be increased, the heat exchange can be improved, and the cooling effect on the stator 4 can be enhanced.

[0045] In some embodiments, the housing 1 includes a housing body 11, an end cap 12, and an immersion cover 13. One end of the housing body 11 is connected to the end cap 12. The end cap 12 has a snap-fit ​​groove 122 on the side facing the inside of the housing body 11. The immersion cover 13 is snapped into the snap-fit ​​groove 122. The immersion cover 13 has a coolant reservoir 132. The snap-fit ​​groove 122 has a housing inlet 121. The coolant reservoir 132 has a cover inlet 131. The housing inlet 121 and the cover inlet 131 are opposite to and communicate with each other. The end of the housing body 11 away from the end cap 12 has a housing outlet 111.

[0046] Reference Figure 13As shown, the shell body 11 is constructed as a cylindrical structure. One end of the cylindrical structure is provided with a through hole 113, which allows the rotor shaft of the rotor 5 to pass through. In addition, the other end of the shell body 11 is open and can be detachably connected to the end cover 12 by connecting bolts. The end cover 12 is provided with a mounting hole 125, which is used to pass through the reducer shaft 6, so that the reducer shaft 6 is connected to the rotor shaft. The end cap 12 has a circular inner peripheral wall 123 and a circular stop ring 124. A snap-fit ​​groove 122 is defined between the circular inner peripheral wall 123 and the circular stop ring 124. The immersion cover 13 is installed in the snap-fit ​​groove 122 and is radially contacted and limited between the inner peripheral wall 123 and the stop ring 124. The end cap 12 has a housing liquid inlet 121. The immersion cover 13 has an annular coolant reservoir 132. The coolant reservoir 132 has a cover liquid inlet 131. The cover liquid inlet 131 is directly opposite to and communicates with the housing liquid inlet 121.

[0047] That is, the oil flows from the housing inlet 121 to the cover inlet 131 and then into the coolant reservoir 132. The coolant reservoir 132 serves as an immersion chamber, and the coolant flows through the coolant reservoir 132 along one end of the stator assembly axial direction to the first cooling channel 7, the end cooling channel 8, the side cooling channel 9, and the second cooling channel 42, and then to the other end of the stator assembly axial direction. The main housing 1 is also provided with a housing outlet 111 at the end opposite to the end cover 12, so that the coolant can flow out from the housing outlet 111, thereby achieving uniform cooling of each layer of winding 2, uniform cooling of the ends of winding 2, and cooling of the stator 4.

[0048] In addition, after the immersion cover 13 and the end cover 12 are assembled, and after the end cover 12 and the housing body 11 are assembled, a relatively sealed coolant reservoir 132 is formed between the immersion cover 13 and the end cover 12, which effectively prevents coolant leakage. The housing inlet 121 is located at the bottom of the motor assembly 100. Gravity and fluid pressure difference are used to enhance the flow of coolant in the coolant reservoir 132, ensuring that the coolant can quickly fill the coolant reservoir 132 and the cooling chamber 10 and penetrate into each cooling channel. Furthermore, the aforementioned second sub-channel 421 has a stepped structure along the radial direction, which increases the contact area between the cooling oil and the stator 4. While improving the heat exchange, it can also reduce the flow rate of the cooling oil in the oil channel to increase the liquid level in the coolant reservoir 132 in the immersion cover 13, reducing the possibility of insufficient oil filling at the top of the coolant reservoir 132. Moreover, the liquid collection chamber 322 of the end plate portion 32 of the insulation structure 3 is narrower near the center of the end plate portion 32 and wider away from the center of the end plate portion 32, which can reduce the overall flow rate of the liquid collection chamber 322 near the center of the end plate portion 32, which helps to increase the oil level in the immersion cover 13.

[0049] In some embodiments, a limiting stop 112 is provided on the inner periphery of the shell body 11, and the insulating structure 3 is installed on the inner periphery of the shell body 11 and is axially limited by the limiting stop 112.

[0050] Reference Figure 14 As shown, the interior of the shell body 11 has a limiting stop 112 at one end away from the end cover 12. The limiting stop 112 is a shoulder that protrudes circumferentially from the inner wall of the shell body 11. When the end plate 32 of the insulation structure 3 comes into axial contact with the shoulder, the axial positioning of the insulation structure 3 can be achieved, and the leakage of the end plate 32 of the insulation structure 3 due to excessive oil pressure can be effectively prevented, thereby ensuring the spraying effect.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A motor assembly (100), characterized in that, include: The housing (1), stator assembly and rotor (5) are provided, the stator assembly is sleeved on the rotor (5), and the housing (1) is located on the outer periphery of the stator assembly and forms a cooling cavity (10) between the housing (1) and the stator assembly. The stator assembly includes a stator (4), windings (2) and an insulation structure (3). The stator (4) is provided with a plurality of circumferentially distributed first mounting slots (41). The insulation structure (3) is provided with a plurality of circumferentially spaced insulation plates (31). The plurality of insulation plates (31) are connected one-to-one in the plurality of first mounting slots (41). Each insulation plate (31) is provided with a second mounting slot (316). The windings (2) include multiple layers. The multiple windings (2) are radially distributed in each second mounting slot (316). A first cooling channel (7) is formed between adjacent windings (2) in the radial direction. Coolant enters the cooling chamber (10) from one end of the housing (1) and flows from one axial end of the stator assembly through each first cooling channel (7) to the other axial end.

2. The motor assembly (100) according to claim 1, characterized in that, Each of the insulating plates (31) is provided with a plurality of support plates (311) distributed radially at intervals, and a cooling sub-cavity (3161) is formed between adjacent support plates (311). Each support plate (311) is provided with a central through hole (312) connecting the adjacent cooling sub-cavities (3161). The windings (2) of adjacent layers in the radial direction form the first cooling channel (7) extending axially at the central through hole (312). The second mounting groove (316) has a first protrusion (314) and a second protrusion (315) at both ends of the stator (4) in the radial direction, which protrude away from each other. The first protrusion (314) and the second protrusion (315) form end cooling channels (8) between the winding (2) of the corresponding layer, respectively. The coolant flows from one end of the stator assembly in the axial direction through the first cooling channel (7) and the end cooling channel (8) to the other end in the axial direction.

3. The motor assembly (100) according to claim 2, characterized in that, Each of the cooling sub-cavities (3161) has a side sub-slot (313) on both inner sidewalls along the circumference of the stator (4), and each of the side sub-slots (313) forms a side cooling channel (9) between the winding (2) of the corresponding layer.

4. The motor assembly (100) according to claim 2, characterized in that, The stator (4) further includes a plurality of circumferentially distributed second cooling channels (42), which are located on the side of the first cooling channel (7) that is radially away from the center of the stator (4).

5. The motor assembly (100) according to claim 4, characterized in that, The insulation structure (3) further includes an end plate portion (32), which is constructed as a ring structure. Multiple circumferentially distributed insulation plates (31) are connected to the end plate portion (32). Multiple insulation plates (31) are inserted into multiple first mounting slots (41) of the stator (4) and the stator (4) is in axial contact with the end plate portion (32). The end plate portion (32) is provided with multiple circumferentially spaced liquid collection chambers (322). Each liquid collection chamber (322) is provided with a spray hole (3221). The coolant in each second cooling channel (42) flows to the corresponding liquid collection chamber (322) and is sprayed out through the spray hole (3221).

6. The motor assembly (100) according to claim 5, characterized in that, Each of the liquid collection chambers (322) is located between two adjacent second mounting slots (316).

7. The motor assembly (100) according to claim 4, characterized in that, Each of the second cooling channels (42) includes a plurality of connected second sub-channels (421), which are distributed axially and partially offset circumferentially.

8. The motor assembly (100) according to claim 7, characterized in that, At least a portion of the plurality of second sub-channels (421) of each second cooling channel (42) are also partially offset radially from the stator (4).

9. The motor assembly (100) according to claim 1, characterized in that, The housing (1) includes a housing body (11), an end cap (12), and an immersion cover (13). One end of the housing body (11) is connected to the end cap (12). The end cap (12) has a snap-fit ​​groove (122) on the side facing the inside of the housing body (11). The immersion cover (13) is snapped into the snap-fit ​​groove (122). The immersion cover (13) has a coolant reservoir (132). The snap-fit ​​groove (122) has a housing inlet (121). The coolant reservoir (132) has a cover inlet (131). The housing inlet (121) and the cover inlet (131) are opposite to and connected to each other. The end of the housing body (11) away from the end cap (12) has a housing outlet (111).

10. The motor assembly (100) according to claim 9, characterized in that, The inner circumference of the shell body (11) is provided with a limiting stop (112), and the insulating structure (3) is installed on the inner circumference of the shell body (11) and is axially limited by the limiting stop (112).

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