CN114421661A - Stator core, stator assembly, motor, power assembly and vehicle - Google Patents

Abstract

The embodiment of the application provides a stator core, a stator assembly, a motor, a power assembly and a vehicle. The stator core is provided with an oil inlet flow passage, a first cooling oil passage and an oil outlet flow passage which are sequentially communicated, the oil inlet flow passage is arranged at the first axial end part of the stator core, the oil outlet flow passage is arranged at the second axial end part of the stator core, and the first cooling oil passage is arranged at the lateral part of the stator core. In this scheme, two axial tip and the lateral part of stator core can all carry out contact heat-conduction with the coolant oil, and the heat of production can in time be taken away by the coolant oil that flows, has increased stator core's heat radiating area by a wide margin to guarantee that stator core can have higher radiating efficiency.

Description

Stator core, stator assembly, motor, power assembly and vehicle

Technical Field

This document relates to but not limited to the field of vehicles, in particular to a stator core, a stator assembly, a motor, a powertrain and a vehicle.

Background

With the increasing demand for power performance of electric vehicles, the torque density and power density of the powertrain have increased as one of the core components of the power output of the electric vehicle, so as to achieve the light weight and miniaturization of the motor. The motor serving as a core part of the power assembly is the key of power output of the power assembly, so that the power output of the power assembly and the power performance of the whole vehicle are directly determined, the torque density and the power density of the motor are increased, and the heat dissipation of the motor becomes a main problem.

The heat dissipation capacity of the motor is improved, so that the torque density and the power density of the motor are improved. Therefore, how to further improve the heat dissipation capability of the motor is a direction and research hotspot for those skilled in the art.

Disclosure of Invention

The embodiment of the application provides a stator core, stator assembly, motor, power assembly and vehicle, is favorable to improving the radiating efficiency of motor, and the torque density and the power density of power assembly also increase thereupon to realize the lightweight and the miniaturization of motor, and then be favorable to the lightweight and the miniaturization of vehicle.

The embodiment of the application provides a stator core, stator core is equipped with the oil feed runner, first cooling oil duct and the runner of producing oil that communicate in proper order, the oil feed runner is established stator core's axial first end portion, the runner of producing oil is established stator core's axial second end portion, first cooling oil duct is established stator core's lateral part.

According to the stator core provided by the embodiment of the application, the cooling oil entering the cooling cavity through the oil inlet can enter the oil inlet flow channel to cool the first axial end part of the stator core; then the oil enters a first cooling oil duct through an oil inlet flow passage to cool the side part of the stator core; then the oil enters an oil outlet flow passage through a first cooling oil passage to cool the axial second end part of the stator core; and finally flows out through the oil outlet. So, two axial tip and the lateral part of stator core can all carry out contact heat-conduction with the coolant oil, the heat of production can in time be taken away by the coolant oil that flows, stator core's heat radiating area has been increased by a wide margin, thereby guarantee that stator core can have higher heat dissipation efficiency, and then improve the thermal diffusivity of the motor that utilizes this scheme stator core, power assembly's torque density and power density also increase thereupon, in order to realize the lightweight and the miniaturization of motor, and then be favorable to the lightweight and the miniaturization of vehicle.

In an exemplary embodiment, the oil inlet flow passage extends in a radial direction of the stator core, and a radially outer end of the oil inlet flow passage communicates with the first cooling oil passage; and/or the oil outlet flow channel extends along the radial direction of the stator core, and the radial outer end of the oil outlet flow channel is communicated with the first cooling oil channel.

In an exemplary embodiment, the arrangement form of the first cooling oil passage includes any one or a combination of any more of the following: the first cooling oil duct rotationally extends along the circumferential direction and the axial direction of the stator core and is spiral; or the first cooling oil duct extends along the axial direction of the stator core and is linear; or the first cooling oil passage comprises a plurality of annular oil passages extending along the circumferential direction of the stator core and a gap oil passage which is positioned between two adjacent annular oil passages and is communicated with the two adjacent annular oil passages; alternatively, the first cooling gallery is in the shape of a mesh.

In an exemplary embodiment, the oil inlet flow passage is located inside the stator core, a first oil inlet hole is formed in an axial first end of the stator core, an inlet of the first oil inlet hole penetrates through an end face of the axial first end of the stator core, and an outlet of the first oil inlet hole is communicated with the oil inlet flow passage; and/or, the runner that produces oil is located inside the stator core, the axial second tip of stator core is equipped with first oil outlet, the entry intercommunication of first oil outlet the passageway that produces oil, the export of first oil outlet runs through the terminal surface of the axial second tip of stator core.

In an exemplary embodiment, a second oil inlet hole is formed at a first axial end of the stator core, the second oil inlet hole is arranged corresponding to a radial middle part of the stator teeth of the stator core, and the second oil inlet hole is communicated with the oil inlet flow passage; and/or, the axial second end of stator core is equipped with the second oil outlet, the second oil outlet with the radial middle part of stator core's stator tooth corresponds the setting, just the second oil outlet intercommunication the runner that produces oil.

In an exemplary embodiment, the stator core includes: an iron core main body; a first stator end plate connected to an axial first end of the core body, the first stator end plate forming an axial first end of the stator core; the second stator end plate is connected with the axial second end of the iron core main body and forms an axial second end part of the stator iron core; and the stator sleeve is sleeved on the outer side of the iron core main body and is provided with the first cooling oil duct.

In an exemplary embodiment, the inner side wall of the stator sleeve and/or the outer side wall of the stator sleeve is provided with the first cooling oil passage.

In an exemplary embodiment, the stator sleeve is a roll-formed one-piece structure or a die-cast one-piece structure.

In an exemplary embodiment, the stator core is provided with stator slots, and the radial inner ends of the stator slots are open; the stator core further includes: and the stator slot wedge is fixed at the radial inner end of the stator tooth space, is a heat conducting piece and is provided with a second cooling oil channel extending along the axial direction of the stator core.

In an exemplary embodiment, a first notch and a second notch which are communicated with the second cooling oil passage are respectively arranged at two ends of the radial outer side wall of the stator slot wedge, the first notch is arranged to be communicated with the cooling cavity at the oil inlet side, and the second notch is arranged to be communicated with the cooling cavity at the oil outlet side; or the radial outer side wall of the stator slot wedge is provided with a third notch which is communicated with the two ends of the stator slot wedge, and the third notch is arranged to communicate the cooling cavity on the oil inlet side and the cooling cavity on the oil outlet side.

In an exemplary embodiment, the stator slot wedge is a flexible material to seal a radially inner end of the stator slot.

An embodiment of the present application further provides a stator assembly, including: a stator core as in any one of the above embodiments; and a stator coil fixed to the stator core.

The embodiment of the application also provides a motor which comprises the stator assembly of the embodiment.

The embodiment of the application also provides a power assembly, which comprises the motor, an oil pump and an oil cooler, wherein the oil pump is arranged to provide circulating power for cooling oil flowing through the stator assembly; and cooling oil passing through the stator assembly enters the oil cooler and is cooled by the oil cooler.

The embodiment of the application also provides a vehicle, which comprises the power assembly in the embodiment.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.

Drawings

The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.

Fig. 1 is an exploded schematic view of a motor according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of the motor shown in FIG. 1;

FIG. 3 is a schematic illustration of a cooling schematic for a stator assembly of the electric machine (with a rotor assembly removed) of FIG. 2;

FIG. 4 is an assembled perspective view of the motor shown in FIG. 1;

fig. 5 is an exploded schematic view of a motor according to another embodiment of the present disclosure;

FIG. 6 is a cross-sectional view of the motor shown in FIG. 5;

FIG. 7 is a schematic perspective view of an end cap according to an embodiment of the present application;

FIG. 8 is a cross-sectional structural view of the end cap of FIG. 7;

FIG. 9 is a schematic perspective view of a sleeve according to an embodiment of the present application;

FIG. 10 is a partial cross-sectional structural schematic view of the sleeve of FIG. 9;

FIG. 11 is an enlarged view of portion A of FIG. 10;

FIG. 12 is a schematic perspective view of a seal provided in accordance with an embodiment of the present application;

FIG. 13 is a cross-sectional structural view of the seal of FIG. 12;

FIG. 14 is a schematic structural view of a labyrinth seal formed by a seal and a sleeve;

FIG. 15 is a schematic view of the labyrinth seal formed by the sleeve and the second stator end plate;

FIG. 16 is a cross-sectional structural view of a stator assembly according to an embodiment of the present application;

fig. 17 is a schematic partial cross-sectional view of a stator core according to an embodiment of the present application;

FIG. 18 is a front view of a first stator end plate according to one embodiment of the present application;

FIG. 19 is an enlarged view of portion B of FIG. 18;

FIG. 20 is a cross-sectional structural view of the first stator end plate of FIG. 18;

FIG. 21 is an enlarged view of portion C of FIG. 20;

FIG. 22 is a schematic view of a portion of a stator assembly shown in an oil inlet side according to an exemplary embodiment of the present disclosure;

FIG. 23 is a schematic partial structural view of the oil outlet side of the stator assembly shown in FIG. 22;

fig. 24 is a partial schematic structural view of a stator core provided in accordance with an embodiment of the present application;

fig. 25 is a schematic front view of a stator core according to an embodiment of the present application;

FIG. 26 is an enlarged view of portion D of FIG. 25;

fig. 27 is a schematic structural view of a stator slot wedge provided in an embodiment of the present application;

FIG. 28 is a cross-sectional structural view of the stator slot wedge of FIG. 27;

FIG. 29 is a side view of the stator slot wedge of FIG. 27;

FIG. 30 is an assembly view of a stator core having stator slot wedges according to one embodiment of the present application;

FIG. 31 is an enlarged view of section E of FIG. 30;

FIG. 32 is a schematic structural view of a stator slot wedge provided in accordance with an embodiment of the present application;

FIG. 33 is a side view of the stator slot wedge of FIG. 32;

fig. 34 is an assembly view of a stator core having stator slot wedges according to another embodiment of the present application;

FIG. 35 is an enlarged view of portion F of FIG. 34;

FIG. 36 is a schematic perspective view of a stator sleeve according to an embodiment of the present application;

FIG. 37 is a cross-sectional structural view of the stator sleeve of FIG. 36;

FIG. 38 is a schematic perspective view of a stator sleeve according to another embodiment of the present application;

FIG. 39 is a cross-sectional structural view of the stator sleeve of FIG. 38;

FIG. 40 is a schematic perspective view of a stator sleeve according to yet another embodiment of the present application;

FIG. 41 is a cross-sectional structural view of the stator sleeve of FIG. 40;

FIG. 42 is a schematic perspective view of a stator sleeve according to yet another embodiment of the present application;

FIG. 43 is a cross-sectional structural view of the stator sleeve shown in FIG. 42;

FIG. 44 is a schematic perspective view of a stator sleeve according to another embodiment of the present application;

FIG. 45 is a cross-sectional structural view of the stator sleeve of FIG. 44;

FIG. 46 is a schematic cooling oil flow diagram of a stator assembly provided in accordance with an embodiment of the present application;

FIG. 47 is a schematic illustration of a cooling schematic of a powertrain according to an embodiment of the present application;

FIG. 48 is a schematic illustration of a cooling schematic for a powertrain according to another embodiment of the present disclosure;

FIG. 49 is a schematic view of a vehicle provided in an embodiment of the present application.

Wherein the reference numerals in fig. 1 to 49 are as follows:

1, a shell assembly, 11 shells, 111 casings, 1111 oil inlets, 1112 water cooling channels, 1113 water inlets, 1114 water outlets, 112 end covers, 1121 oil outlets, 113 first mounting grooves, 12 partitions, 120 sleeves, 121 first sleeves, 122 second sleeves, 123 first sealing rings, 124 first sealing grooves, 125 third sealing rings, 126 third sealing grooves, 13 cooling cavities, 14 sealing elements, 141 sealing bodies, 142 second sealing rings, 143 second sealing grooves and 15 sealing glue;

2, a stator assembly, 21, a stator core, 211, a first stator end plate, 2111, a first oil inlet, 2112, a second oil inlet, 2113, a first transition flow channel, 2114, 212, a second stator end plate, 2121, a first oil outlet, 2122, a second oil outlet, 2123, a core body 213, 214, a stator sleeve, 2141, a first cooling oil channel, 215, a stator tooth slot, 2151, 216, a second mounting groove, 22, a stator coil 221 end winding, 23, a stator slot wedge, 231, a first notch, 232, a second notch, 233, a third notch, 234, a second cooling oil channel;

3 rotor assembly, 31 third cooling gallery; 4, a motor controller; 5, an oil pump; 6, an oil cooler; 7, a water pump; 8, a water cooler; 100 vehicles.

Detailed Description

With the increasing demand for power performance of electric vehicles, the torque density and power density of the powertrain have increased as one of the core components of the power output of the electric vehicle, so as to achieve the light weight and miniaturization of the motor. The motor serving as a core part of the power assembly is the key of power output of the power assembly, and directly determines the power output of the power assembly and the power performance of the whole vehicle.

The heat dissipation capacity of the motor is improved, so that the torque density and the power density of the motor are improved. Therefore, how to further improve the heat dissipation capability of the motor is a direction and research hotspot for those skilled in the art.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

In one exemplary embodiment, as shown in fig. 1, an electric machine includes: a housing assembly 1, a stator assembly 2 and a rotor assembly 3.

Therein, a cooling cavity 13 for flowing cooling oil is provided in the housing assembly 1, as shown in fig. 2 and 3. The housing assembly 1 is provided with an oil inlet 1111 and an oil outlet 1121 communicating with the cooling chamber 13.

The stator assembly 2 is at least partially disposed within the cooling cavity 13 such that the stator assembly 2 is at least partially immersed in the cooling oil.

The rotor assembly 3 is rotatably sleeved on the inner side of the stator assembly 2.

In this embodiment, a cooling cavity 13 is provided in the housing assembly 1, and cooling oil can enter the cooling cavity 13 through the oil inlet 1111 of the housing assembly 1 and flow out of the oil outlet 1121 of the housing assembly 1. Since at least a part of the stator assembly 2 is located in the cooling cavity 13, at least a part of the stator assembly 2 can be immersed in the cooling oil in the cooling cavity 13 and directly contact with the cooling oil, so as to realize contact oil cooling. Like this, the cooling oil can fully contact with stator assembly 2 as far as possible under hydraulic action for stator assembly 2 can have relatively great area of contact with the cooling oil, improves stator assembly 2's heat radiating area, and the heat of stator assembly 2 can in time be taken away to the cooling oil that flows, therefore compare in drenching the radiating efficiency that oily formula cooling scheme can improve the motor by a wide margin.

In an exemplary embodiment, the stator assembly 2 includes: the stator core 21 and the stator coil 22 are shown in fig. 16.

Wherein the stator core 21 is at least partly located in the cooling chamber 13, as shown in figure 2. The stator coil 22 is located in the cooling cavity 13 and fixed to the stator core 21.

The stator assembly 2 includes a stator core 21 and a stator coil 22. Since at least a part of the stator core 21 is located inside the cooling chamber 13, at least a part of the stator core 21 may be immersed in the cooling oil. Thus, the cooling oil can directly realize contact heat conduction with the stator core 21, and the heat of the stator core 21 is taken away in time. The stator coil 22 is also located in the cooling chamber 13, and thus the stator coil 22 can be immersed in the cooling oil. In this way, the cooling oil can directly realize contact heat conduction with the stator coil 22, and take away the heat of the stator coil 22 in time. Thus, the stator core 21 and the stator coil 22 can be in contact heat conduction with the cooling oil, and the generated heat can be taken away by the flowing cooling oil in time, so that the motor is ensured to have higher heat dissipation efficiency.

In an exemplary embodiment, the rotor assembly 3 is spaced from the cooling cavity 13 to limit cooling oil within the cooling cavity 13 from contacting the rotor assembly 3. In other words, the cooling chamber 13 is a sealed chamber, and the rotor assembly 3 is located outside the cooling chamber 13.

This prevents the cooling oil in the cooling chamber 13 for cooling the stator assembly 2 from contacting the rotor assembly 3, thereby fundamentally preventing the occurrence of oil churning loss.

In an exemplary embodiment, as shown in fig. 1, the housing assembly 1 includes: a housing 11 and a partition 12. The housing 11 is provided with an oil inlet 1111 and an oil outlet 1121. The partition 12 is fixed inside the casing 11 and encloses at least part of the cooling chamber 13 with the casing 11.

Wherein the partition 12 comprises at least one sleeve 120, the sleeve 120 being sealingly connected with the housing 11, as shown in fig. 14. The sleeve 120 sealingly connected to the end cap 112 is designated as a first sleeve 121, and the sleeve 120 sealingly connected to the casing 111 is designated as a second sleeve 122.

Because the housing assembly 1 includes the outer shell 11 and the partition 12, the partition 12 is fixed in the outer shell 11, and can enclose at least a part of the cooling cavity 13 with the outer shell 11, and in addition, because the partition 12 includes at least one sleeve 120, and the sleeve 120 is connected with the outer shell 11 in a sealing manner, the cooling oil in the cooling cavity 13 can be prevented from leaking to the outside of the cooling cavity 13 from a gap between the sleeve 120 and the outer shell 11, which is beneficial to preventing the cooling oil in the cooling cavity 13 from leaking to contact with the rotor assembly 3 to cause oil stirring loss.

Since the sleeve 120 is closely adjacent to the stator coil 22, the sleeve 120 must have good insulation and cut-off resistance, and low magnetic permeability. Therefore, the material of the sleeve 120 may be, but is not limited to: polymeric resin materials, carbon fibers, carbon fiber composite materials, glass fiber composite materials and the like.

In an exemplary embodiment, the sleeve 120 is sealingly coupled to the housing 11 via a seal 14.

The housing 11 is provided with a first mounting groove 113 as shown in fig. 8. The sealing member 14 is mounted in the first mounting groove 113 as shown in fig. 12 and 14.

As shown in fig. 9, 10 and 11, one end of the sleeve 120 connected to the housing 11 is provided with two first sealing rings 123 concentrically arranged, and a first sealing groove 124 is formed between the two first sealing rings 123.

As shown in fig. 12 and 13, the sealing member 14 includes a sealing body 141 and two second sealing rings 142 connected to the sealing body 141, the two second sealing rings 142 are concentrically disposed, and a second sealing groove 143 is formed between the two second sealing rings 142.

As shown in fig. 14, one of the first seal rings 123 is inserted into the second seal groove 143 and is sealingly engaged with a groove wall of the second seal groove 143, and one of the second seal rings 142 is inserted into the first seal groove 124 and is sealingly engaged with a groove wall of the first seal groove 124.

Thus, the sleeve 120 and the sealing member 14 form a structure embedded with each other, forming a multi-sealing surface, resulting in a serpentine shape of a leakage path of the cooling oil, thus increasing the length of a leakage mating surface, forming a labyrinth-fit sealing structure, and thus having a reliable sealing effect.

Alternatively, the sleeve 120 may not be provided with the two first sealing rings 123, and the end of the sleeve 120 is directly inserted into the second sealing groove 143 of the sealing member 14 to achieve sealing engagement, at this time, the permeation path is U-shaped, and has a longer length and a better sealing effect.

Of course, the sealing member 14 may be a conventional O-ring, or may be directly sealed by the sealant 15. However, the O-ring and the sealant 15 are required to have a sufficient sealing space, and the thickness of the O-ring and the thickness of the cured sealant 15 are superimposed on the axial dimension of the motor, which increases the requirement of the motor for the assembly space.

The labyrinth sealing scheme of the embodiment of the application makes full use of the inner space of the sealing element 14 and the inner space of the sleeve 120, so that sealing is conveniently realized in a small space, the increase of the axial size of the motor can be avoided, the miniaturization of the motor is facilitated, and the requirement of the motor on the assembly space is reduced.

In an exemplary embodiment, first seal groove 124 and/or second seal groove 143 may have sealant 15 disposed therein, as shown in fig. 14. This can further improve the sealing reliability.

In the assembling process, the sealant 15 has high fluidity, and the sleeve 120 and the sealing element 14 can be mutually extruded in the assembling process, so that the sealant 15 is extruded in the first sealing groove 124/the second sealing groove 143, and reliable sealing is formed after the sealant 15 is cured.

Thus, the sleeve 120 and the sealing member 14 realize double sealing effects through extrusion interference and glue injection, and the sealing is reliable.

In an exemplary embodiment, as shown in fig. 1 and 2, the housing 11, the partition 12 and the stator assembly 2 enclose the cooling cavity 13, the number of the sleeves 120 is two, one end of each sleeve 120 is hermetically connected with the housing 11, and the other end of each sleeve 120 is hermetically connected with an axial end of the stator core 21 of the stator assembly 2.

In this embodiment, the housing 11, the partition 12 and the stator assembly 2 surround the cooling cavity 13, and only the relatively short sleeves 120 are required to be respectively disposed at two axial sides of the stator core 21. Compared with the arrangement of a whole sleeve 120 connected to the two axial ends of the housing 11, the present scheme is favorable for shortening the total length of the sleeve 120, saving the material of the sleeve 120, further reducing the production cost, and also avoiding the sleeve 120 from penetrating through the whole air gap.

In this embodiment, the inner sidewall of the stator core 21 participates in the enclosing formation of the cooling cavity 13, so that the inner sidewall of the stator core 21 is located outside the cooling cavity 13, and the stator assembly 2 is partially located in the cooling cavity 13. But also has high heat dissipation efficiency because both axial end portions and the radially inner and outer portions of the stator core 21 are provided with the cooling oil passages.

On the other hand, the sleeve 120 is also hermetically connected with the axial end of the stator core 21, so that the cooling oil in the cooling cavity 13 can be effectively prevented from leaking to the rotor assembly 3 through the connecting part of the sleeve 120 and the stator core 21, and the oil stirring loss is favorably avoided.

The stator core 21 is provided with stator slots 215 as shown in fig. 30 and 34. The radially inner ends of the stator slots 215 are open. The stator core 21 further includes: the stator slot wedges 23 are fixed at the radial inner ends of the stator tooth grooves 215, the stator slot wedges 23 are heat-conducting pieces, the radial inner ends of the stator tooth grooves 215 are arranged in an open mode, the stator slot wedges 23 adopt a scheme of sealing pieces 14, and the stator slot wedges 23 also seal the inner side portions of the stator iron cores 21. In the case of the stator slot 215 having a radially inner end closed, the inner side wall of the stator core 21 is also sealed.

Therefore, the cooling cavity 13 forms a sealing cavity and is separated from the rotor assembly 3, so that the cooling oil in the cooling cavity 13 can be effectively prevented from leaking and contacting the rotor assembly 3, and the oil stirring loss can be fundamentally avoided.

In an exemplary embodiment, as shown in fig. 15, the axial end portion of the stator core 21 is provided with a second mounting groove 216. One end of the stator core 21 to which the sleeve 120 is connected is provided with two concentrically arranged third seal rings 125, and a third seal groove 126 is formed between the two third seal rings 125.

One of the third sealing rings 125 is inserted into the second mounting groove 216 and is in sealing engagement with the groove wall of the second mounting groove 216. The second mounting groove 216 and/or the third sealing groove 126 are provided with a sealing glue 15 therein.

In this way, the sleeve 120 and the stator core 21 also form a mutually nested labyrinth seal structure, and the seal reliability can be ensured by the seal gum 15, so that the leakage of the cooling oil to the rotor assembly 3 can be effectively prevented, and the oil stirring loss is avoided.

Thus, the sleeve 120 and the axial end of the stator core 21 can be sealed reliably by extruding interference and injecting glue.

Wherein the second stator end plate 212 forms the second axial end of the stator core 21, since the first stator end plate 211 forms the first axial end of the stator core 21. Therefore, the first stator end plate 211 and the second stator end plate 212 of the stator core 21 are each provided with the second mounting groove 216, as shown in fig. 20 and 21. The first stator end plate 211 and the second stator end plate 212 are respectively connected to the two sleeves 120 in a sealing manner by a labyrinth sealing scheme.

Or, the sleeve 120 may not be provided with the two third sealing rings 125, and the end of the sleeve 120 is directly inserted into the second mounting groove 216 to achieve sealing engagement, and at this time, the permeation path is U-shaped, and has a longer length and a better sealing effect.

In an exemplary embodiment, the housing 11 and the partition 12 enclose a cooling cavity 13, the number of the sleeves 120 is one, the sleeves 120 are sleeved on the inner side of the stator assembly 2, and both ends of the sleeves 120 are hermetically connected with the housing 11.

According to the scheme, the cooling cavity 13 is formed by enclosing the shell 11 and the partition 12, so that the stator assembly 2 and the rotor assembly 3 are completely separated by the partition 12, and oil stirring loss can be fundamentally avoided. And, the stator assembly 2 can be completely located in the cooling cavity 13, the stator assembly 2 can be completely immersed in the cooling oil, and thus has high heat dissipation efficiency.

In an exemplary embodiment, as shown in fig. 1, the housing 11 includes: a housing 111 and an end cap 112.

Wherein, one end of the housing 111 is opened. The end cover 112 covers the open end of the housing 111 and is fixedly connected to the housing 111. One of the housing 111 and the end cover 112 is provided with an oil inlet 1111, and the other is provided with an oil outlet 1121.

In one example, the rear end of the cabinet 111 is open, and the end cover 112 covers the rear end of the cabinet 111. The oil inlet 1111 is disposed at the front end of the housing 111, and the oil outlet 1121 is disposed on the end cover 112, as shown in fig. 7 and 8. The front end of the housing 111 is provided with a first mounting groove 113, and the cover 112 is also provided with a first mounting groove 113, as shown in fig. 2, 6 and 8.

The sleeve 120 sealingly connected to the end cap 112 is designated as a first sleeve 121, and the sleeve 120 sealingly connected to the casing 111 is designated as a second sleeve 122. In the assembling process, after the iron core 21 to be assembled with the stator coil 22 is completed, the iron core is assembled with the second sleeve 122 and the casing 111, and the assembly is sealed. And then is completely assembled and sealed with the first sleeve 121 and the end cap 112.

Before the first sleeve 121 and the second sleeve 122 are installed, the high-fluidity sealant 15 is coated in the first sealing groove 124 of the first sleeve 121 and the second sleeve 122, and then the sleeve 120 can extrude the sealant 15 into the second sealing groove 143 to form a seal when the sleeve 120 is installed. Therefore, the permeation path of the sealing structure forms a labyrinth path, and labyrinth sealing is realized.

Like this, end cover 112, first sleeve 121, casing 111, second sleeve 122 and stator core 21 enclose to close and form cooling chamber 13, are filled with cooling oil in cooling chamber 13, and the cooling chamber 13 can be immersed in to the overwhelming majority of stator assembly 2 (except stator core 21's inside wall), and cooling oil flows in cooling chamber 13, adopts contact oil cooling, in time takes away the heat of stator assembly 2, compares in drenching the radiating efficiency that oily formula scheme has improved the motor by a wide margin.

Of course, the casing may also have two ends open, and the housing includes a casing and two end covers, and the two end covers are respectively connected to two ends of the casing. At the moment, one end cover is provided with an oil inlet, and the other end cover is provided with an oil outlet. Alternatively, the housing may be open at the front end and the end cap may be a front end cap.

In an exemplary embodiment, as shown in fig. 1 to 4, the number of the oil inlets 1111 is multiple, and the multiple oil inlets 1111 are arranged at intervals along the circumferential direction of the motor. The number of the oil outlets 1121 is plural, and the plural oil outlets 1121 are arranged at intervals along the circumferential direction of the motor. This is favorable to improving the cooling oil flow in the cooling cavity 13, thereby being favorable to improving the heat dissipation efficiency of the motor and also being favorable to improving the heat dissipation uniformity.

In one example, the number of the oil inlets 1111 is two, and as shown in fig. 1 and 4, the two oil inlets 1111 are symmetrically arranged. The number of the oil outlets 1121 is two, and the two oil outlets 1121 are symmetrically arranged.

In an exemplary embodiment, as shown in fig. 2, the rotor assembly 3 is hollow inside, and the inner cavity of the rotor assembly 3 forms a third cooling oil passage 31 for cooling the rotor assembly 3, so that the cooling oil can enter the rotor assembly 3 to cool the rotor assembly 3. So, stator assembly 2 and rotor assembly 3 realize high-efficient cooling through the cooling oil separately, have guaranteed the radiating efficiency of motor.

In an exemplary embodiment, as shown in fig. 2, 3 and 4, the housing 111 is further provided with a water cooling channel 1112 and a water inlet 1113 and a water outlet 1114 communicating with the water cooling channel 1112, and the water cooling channel 1112 is disposed around a side circumference of the housing 111.

The water cooling channel 1112 can take away the heat of the cooling oil in the cooling cavity 13 in time through the cooling water, so that a mixed cooling scheme of oil cooling and water cooling is realized, and the heat dissipation efficiency of the motor can be further improved.

In one example, as shown in fig. 1 and 4, the water inlet 1113 and the water outlet 1114 of the water cooling channel 1112 are both disposed on the side wall of the cabinet 111, and one is located at the front of the side wall of the cabinet 111 and the other is located at the rear of the side wall of the cabinet 111. Through letting in recirculated cooling water, form the water-cooling scheme, can further improve the radiating efficiency of motor.

In an exemplary embodiment, the water cooling channel 1112 spirals around the housing 111 as shown in fig. 2 and 3. Alternatively, the cross section of the water cooling channel 1112 is circular, and the side wall of the casing 111 is a hollow structure or a structure nested inside and outside.

So that the cooling water and the cooling oil in the circumferential direction of the stator assembly 2 can fully exchange heat, and the heat dissipation efficiency of the motor is further improved.

In one example, the water for the cooling channels is from the cooling water of the motor controller 4. In other words, the cooling water cooled by the motor controller 4 enters the water cooling channel 1112 of the motor casing 111 to take away the heat of the cooling oil in the motor.

Of course, the water cooling channel 1112 may be omitted, as shown in fig. 5 and 6.

As shown in fig. 2, 3, 6, 16, and 17, an embodiment of the present application provides a stator core 21, and the stator core 21 is provided with an oil inlet flow passage 2113, a first cooling oil passage 2141, and an oil outlet flow passage 2123 which are sequentially communicated. The oil inlet flow passage 2113 is provided at a first axial end portion of the stator core 21, the oil outlet flow passage 2123 is provided at a second axial end portion of the stator core 21, and the first cooling oil passage 2141 is provided at a side portion of the stator core 21.

The oil inlet flow passage 2113 is communicated with an oil inlet 1111 of the motor, and the oil outlet flow passage 2123 is communicated with an oil outlet 1121 of the motor.

In the stator core 21 provided in the embodiment of the present application, the cooling oil entering the cooling cavity 13 through the oil inlet 1111 may enter the oil inlet flow passage 2113 to cool the axial first end portion of the stator core 21; then enters the first cooling oil passage 2141 through the oil inlet flow passage 2113 to cool the side portion of the stator core 21; then enters the oil outlet flow passage 2123 through the first cooling oil passage 2141 to cool the second axial end of the stator core 21; and finally flows out through an oil outlet 1121. So, two axial tip and the lateral part of stator core 21 can all carry out contact heat-conduction with the cooling oil, and the heat of production can in time be taken away by the cooling oil that flows, has increased stator core 21's heat radiating area by a wide margin to guarantee that stator core 21 can have higher radiating efficiency.

In an exemplary embodiment, as shown in fig. 17, an oil inlet flow passage 2113 extends in the radial direction of the stator core 21, and the radially outer end of the oil inlet flow passage 2113 communicates with the first cooling oil passage 2141. The oil outlet passage 2123 extends in the radial direction of the stator core 21, and the radially outer end of the oil outlet passage 2123 communicates with the first cooling oil passage 2141.

The oil inlet flow passage 2113 and the oil outlet flow passage 2123 extend along the radial direction of the stator core 21, the structure is regular, and the processing and forming are facilitated. The radially outer end of the oil inlet flow passage 2113 and the radially outer end of the oil outlet flow passage 2123 are communicated with the first cooling oil passage 2141, and the first cooling oil passage 2141 is approximately located at a radially outer position (a radially outer side portion) of the stator core 21, so that the periphery of the stator core 21 is cooled, and the increase of the heat dissipation area of the stator core 21 is facilitated.

As for the specific shape of the first cooling oil passage 2141, there is no limitation.

In one example, as shown in fig. 17, 36, and 37, the first cooling oil passage 2141 extends in a spiral shape rotationally in the circumferential direction and the axial direction of the stator core 21.

In fig. 17, 36, and 37, the first cooling oil passage 2141 rotates by a rotational angle of less than 360 °, such as approximately 30 °, 60 °, 90 °, 120 °, 150 °, 180 °, 270 °, 300 °, and so forth. In other words, the first cooling oil passage 2141 is a spiral oil passage, but extends only slightly in the circumferential direction of the stator core 21, and does not rotate to form a full-turn structure. Therefore, the cooling oil in the first cooling oil passage 2141 also flows substantially in the axial direction of the stator core 21, i.e., the first cooling oil passage 2141 is still an axial flow passage.

Of course, the rotation angle of the first cooling oil passage 2141 may also be equal to 360 °, or greater than 360 °. At this time, the first cooling oil passage 2141 is a spiral oil passage, and the rotation amplitude is large, forming a full-turn structure, such as a spiral oil passage forming three or four turns.

In one example, as shown in fig. 38 and 39, the first cooling oil passage 2141 extends linearly in the axial direction of the stator core 21, and is an axial flow passage.

In the above two examples, the first cooling oil passage 2141 flows substantially in the axial direction of the electric machine, and the flow path is substantially equal to the axial length of the electric machine. Because the axial length of motor is less relatively, consequently adopt the axial runner of this scheme, can shorten oil return period.

Most of the traditional oil spraying type cooling schemes are radial oil paths, cooling oil is sprayed out from a spray pipe, flows to the lowest point of the excircle of the stator core 21 along the highest point of the excircle of the stator core 21 at one position, and returns to an oil storage tank from the lowest point; the other route stator coil 22 outer circle crawls to the stator coil 22 lowest point and returns to the oil storage groove. Both paths are radial flow channels, and the inner side of the stator core 21 is not provided with a cooling flow channel. The flow path of the cooling oil is more than or equal to half of the circumferential size of the motor, the length is larger, and the crawling path of the cooling oil is longer than the axial flow passage, so that the oil return period is longer.

In other examples, as shown in fig. 40 and 41, the first cooling oil passage 2141 includes a plurality of ring oil passages and a plurality of clearance oil passages. The annular oil passage extends in the circumferential direction of the stator core 21 and is annular. The plurality of annular oil passages are provided at intervals in the axial direction of the stator core 21. A gap oil passage is arranged between the two adjacent annular oil passages, and the gap oil passage can axially extend along the stator core 21 to communicate the two adjacent annular oil passages. In this way, the cooling oil on the side of the stator core 21 may also flow from the first end to the second end of the stator core 21 in the axial direction. Alternatively, the first cooling oil passage 2141 is mesh-shaped, as shown in fig. 42 and 43.

Of course, the shape of the first cooling oil passage 2141 may also take any combination of the above-described examples, and other shapes such as a wavy shape, a zigzag shape, and the like may also be used.

In an exemplary embodiment, the first cooling oil passage 2141 is located inside the stator core 21, so as to effectively dissipate heat inside the stator core 21 and to conduct away heat inside the stator core 21 in time.

In an exemplary embodiment, the oil inlet flow passage 2113 is located inside the stator core 21. The first axial end portion of the stator core 21 is provided with a first oil inlet hole 2111, as shown in fig. 18, 19, and 24. An inlet of the first oil inlet hole 2111 penetrates an end surface of the axial first end portion of the stator core 21 so that the first oil inlet hole 2111 can communicate with the oil inlet 1111. An outlet of the first oil inlet hole 2111 communicates with the oil inlet flow passage 2113.

Oil outlet passage 2123 is located inside stator core 21. The axial second end portion of the stator core 21 is provided with a first oil outlet hole 2121 (shown in fig. 15). The inlet of the first oil outlet hole 2121 communicates with the oil outlet passage. An outlet of the first oil outlet hole 2121 penetrates an end surface of the axial second end portion of the stator core 21 so that the first oil outlet hole 2121 can communicate with the oil outlet 1121.

In this embodiment, a first oil inlet 2111 is disposed at a first axial end of the stator core 21, so that the cooling oil entering the cooling cavity 13 through the oil inlet 1111 can enter the oil inlet flow passage 2113 of the stator core 21 through the first oil inlet 2111 and further enter the first cooling oil passage 2141.

The first oil outlet hole 2121 is disposed at the second axial end of the stator core 21, so that the cooling oil output from the first cooling oil passage 2141 can enter the first oil outlet hole 2121 through the oil outlet flow passage 2123, further flow out of the stator core 21, and finally is discharged through the oil outlet 1121.

In an exemplary embodiment, the first axial end portion of the stator core 21 is provided with a second oil inlet hole 2112, as shown in fig. 19 and 22. The second oil inlet 2112 corresponds to the radial middle of the stator teeth of the stator core 21, and the second oil inlet 2112 communicates with the oil inlet flow passage 2113.

As shown in fig. 23, the axial second end portion of the stator core 21 is provided with a first oil outlet hole 2122, the first oil outlet hole 2122 is disposed corresponding to the radial middle portion of the stator teeth of the stator core 21, and the first oil outlet hole 2122 communicates with the oil outlet flow passage 2123.

Thus, the second oil inlet hole 2112 faces the middle position of the end winding 221 of the side stator coil 22, as shown in fig. 22. The side end winding 221 is immersed in the cooling oil, and the cooling oil flows through the middle position of the side end winding 221 and enters the second oil inlet 2112 to cool the inside of the side end winding 221, so that the inside and the outside of the side end winding 221 can be uniformly cooled, uneven heat dissipation caused by that the oil-spraying type cooling can only cool the outside of the side end winding 221 of the stator coil 22 is avoided, and a heat dissipation dead zone is avoided. The cooling oil that has uniformly cooled the side end winding 221 can flow into the first cooling flow passage through the oil inlet flow passage 2113, and the fluidity of the cooling oil is ensured.

The first oil outlet holes 2122 face the middle position of the end winding 221 of the stator coil 22 on the side, as shown in fig. 23. The side end winding 221 is immersed in the cooling oil, and the cooling oil flowing out from the second cooling oil passage 234 can flow to the first oil outlet hole 2122 through the oil outlet flow passage 2123 to cool the inside of the side end winding 221, so that the inside and the outside of the side end winding 221 can be uniformly cooled, uneven heat dissipation caused by that the oil-spraying type cooling can only cool the outside of the side end winding 221 of the stator coil 22 is avoided, and a heat dissipation dead zone is avoided.

In an exemplary embodiment, as shown in fig. 18 and 19, the number of the oil inlet flow passages 2113 is plural, and the plural oil inlet flow passages 2113 are provided at intervals, such as uniformly, in the circumferential direction of the stator core 21.

The oil outlet passage 2123 is provided in plural numbers, and the plural oil outlet passages 2123 are provided at intervals, for example, uniformly, in the circumferential direction of the stator core 21.

The number of the first cooling oil passages 2141 is plural, and the plural first cooling oil passages 2141 are provided at intervals, such as uniformly, in the circumferential direction of the stator core 21, as shown in fig. 36 and 37.

The number of the first oil inlet holes 2111 is plural, and the plural first oil inlet holes 2111 are provided at intervals, for example, uniformly provided, in the circumferential direction of the stator core 21, as shown in fig. 18 and 19.

The number of the second oil inlet holes 2112 is plural, and the plural second oil inlet holes 2112 are provided at intervals, for example, uniformly provided, in the circumferential direction of the stator core 21, as shown in fig. 18 and 19.

The number of the first oil outlet holes 2121 is plural, and the plural first oil outlet holes 2121 are arranged at intervals, for example, uniformly arranged, in the circumferential direction of the stator core 21.

The number of the second oil outlet holes 2122 is plural, and the plural second oil outlet holes 2122 are arranged at intervals, for example, uniformly arranged, in the circumferential direction of the stator core 21.

In one example, the plurality of first oil inlet holes 2111 may be provided in one-to-one correspondence with the plurality of oil inlet flow passages 2113 (although not necessarily, may be provided in one-to-one correspondence), as shown in fig. 18 and 19. The first oil outlet holes 2121 may be provided in one-to-one correspondence with the oil outlet passages 2123 (of course, they may not be provided in one-to-one correspondence). The plurality of oil inlet flow passages 2113, the plurality of first cooling oil passages 2141, and the plurality of oil outlet flow passages 2123 are provided in a one-to-one correspondence (certainly, may not be provided in a one-to-one correspondence).

In one example, the plurality of first oil inlet holes 2111 and the plurality of second oil inlet holes 2112 are arranged offset in the circumferential direction of the stator core 21, as shown in fig. 18 and 19.

In one example, the number of second oil inlet holes 2112 is equal to the number of stator teeth and is arranged in a one-to-one correspondence.

In other examples, the number of the second oil inlet holes 2112 is not equal to the number of the stator teeth, such as half of the number of the stator teeth or an integral multiple of the number of the stator teeth, and of course, there may be no corresponding relationship in number. The plurality of second oil inlet holes 2112 may be uniformly arranged in the circumferential direction of the stator core 21.

The scheme is favorable for uniform distribution of the flow of the cooling oil, so that the heat dissipation uniformity of the stator assembly 2 is improved, and heat dissipation dead zones are avoided.

In an exemplary embodiment, the first axial end of the stator core 21 is further provided with a first transition flow passage 2114 extending circumferentially along the stator core 21 and having a ring shape, as shown in fig. 19. The first transition flow passage 2114 is provided to communicate the oil intake flow passage 2113, the first oil inlet hole 2111, and the second oil inlet hole 2112.

The second axial end of the stator core 21 is further provided with a second transition flow passage extending along the circumferential direction of the stator core 21 and having an annular shape, and the second transition flow passage is configured to communicate the oil outlet flow passage 2123, the first oil outlet hole 2121, and the first oil outlet hole 2122.

Thus, the first and second axial end portions of the stator core 21 have a larger heat dissipation area and thus have higher heat dissipation efficiency.

In an exemplary embodiment, as shown in fig. 17, the stator core 21 includes: a core body 213, a first stator end plate 211, a second stator end plate 212, and a stator sleeve 214.

Wherein the first stator end plate 211 is connected to an axial first end of the core body 213, the first stator end plate 211 forming an axial first end of the stator core 21.

The second stator end plate 212 is connected to an axial second end of the core main body 213, and the second stator end plate 212 forms an axial second end of the stator core 21.

The stator sleeve 214 is disposed outside the core main body 213, and the stator sleeve 214 is provided with a first cooling oil passage 2141.

In this embodiment, the stator core 21 includes a core main body 213, a first stator end plate 211, a second stator end plate 212, and a stator sleeve 214. The core main body 213 may be formed by laminating stator laminations. The first stator end plate 211 and the second stator end plate 212 are fixed at two axial ends of the core main body 213 to form a first axial end and a second axial end of the stator core 21, respectively, and the first stator end plate 211 is provided with an oil inlet flow passage 2113, a first oil inlet 2111, a second oil inlet 2112, a first transition flow passage 2114 and other structures, as shown in fig. 18 and 19; the second stator end plate 212 has an oil outlet passage 2123, a first oil outlet hole 2121, a first oil outlet hole 2122, a second transition passage, and the like. The stator sleeve 214 is fitted around the outside of the core body 213 to form the outside of the stator core 21. Stator sleeve 214 is provided with a first cooling flow channel, as shown in fig. 36 to 45, so that the first cooling flow channel is located at the outer side of stator core 21, which is beneficial to increase the heat dissipation area of the side of stator core 21, and is convenient for conducting away the heat generated by stator core 21 in time.

Of course, if the center of stator sleeve 214 is provided with a flow passage hole extending along the circumferential direction of stator sleeve 214, the radial flow passage cooling scheme may be changed, and the changeability is high. If the first stator end plate 211 and the second stator end plate 212 are removed, the stator sleeve 214 is matched with the length of the stator core 21, and the oil spraying scheme can be converted.

In an exemplary embodiment, the first cooling oil passage 2141 penetrates the inner sidewall of the stator sleeve 214 in the radial direction of the stator core 21, as shown in fig. 36 to 43. In other words, the inner sidewall of the stator sleeve 214 is provided with the first cooling oil passage 2141.

In this way, the cooling oil in the first cooling oil passage 2141 may directly contact with the core main body 213, and the heat of the core main body 213 is conducted away in time, thereby further improving the heat dissipation efficiency of the stator core 21. In addition, the processing difficulty of the stator sleeve 214 can be reduced, the stator sleeve 214 can be conveniently processed and molded, and the production cost is further reduced.

In an exemplary embodiment, the first cooling oil passage 2141 penetrates the outer side wall of the stator sleeve 214 in the radial direction of the stator core 21, as shown in fig. 44 and 45. In other words, the outer sidewall of the stator sleeve 214 is provided with the first cooling gallery 2141.

In this way, the cooling oil in the first cooling oil passage 2141 may directly contact with the inner side wall of the housing assembly 1, and the heat of the stator core 21 is timely conducted to the housing assembly 1, thereby further improving the heat dissipation efficiency of the stator core 21. In addition, the processing difficulty of the stator sleeve 214 can be reduced, the stator sleeve 214 can be conveniently processed and molded, and the production cost is further reduced.

In an exemplary embodiment, both the inner and outer sidewalls of stator sleeve 214 are provided with first cooling gallery 2141.

The first cooling gallery 2141 located on the inner sidewall and the outer sidewall of the stator sleeve 214 may be communicated with each other and integrated into one, so as to form a cooling gallery penetrating the inner sidewall and the outer sidewall of the stator sleeve 214.

The first cooling gallery 2141 located on the inner and outer side walls of the stator sleeve 214 may also be independent of each other. For example, first cooling gallery 2141 located on the inner sidewall of stator sleeve 214 may be offset from first cooling gallery 2141 located on the outer sidewall of stator sleeve 214. This facilitates both uniform heat dissipation and reduced wall thickness of stator sleeve 214.

In an exemplary embodiment, the stator sleeve 214 is a roll formed unitary structure (which may be machined using fixed shape gear hobbing) or a die cast unitary structure.

In an exemplary embodiment, an end surface of the first stator end plate 211 facing away from the core main body 213 is provided with a second mounting groove 216, and an end surface of the second stator end plate 212 facing away from the core main body 213 is also provided with a second mounting groove 216, and the second mounting groove 216 is used for being hermetically connected with the sleeve 120 of the motor. As for the specific sealing connection, it will be explained in detail in the embodiment of the motor part.

In an exemplary embodiment, the stator core 21 is provided with stator slots 215, as shown in fig. 30 and 34. The radially inner ends of the stator slots 215 are open. The stator core 21 further includes: the stator slot wedges 23.

The stator slot wedges 23 are fixed at the radial inner ends of the stator tooth grooves 215, and the stator slot wedges 23 are heat-conducting members. The stator slot wedges 23 are provided with second cooling oil passages 234 extending in the axial direction of the stator core 21 (i.e., extending in the length direction of the stator slot wedges 23), as shown in fig. 29, 33, and 35. The second cooling flow channel is communicated with the oil inlet 1111 and the oil outlet 1121.

Further, the stator slot wedges 23 are of a flexible material to seal the radially inner ends of the stator slots 215.

The stator slot of the scheme has a sealing effect, and can prevent cooling oil in the cooling cavity 13 from entering the assembly space of the rotor assembly 3 through the stator tooth slot 215 and contacting the rotor assembly 3, so that the cooling oil can be prevented from being thrown out when the rotor assembly 3 rotates to cause cooling oil loss, the problem of oil stirring loss can be solved fundamentally, and the utilization rate of the cooling oil is improved.

On the other hand, the stator slot wedge 23 is further provided with a second cooling oil passage 234, and the cooling oil entering the cooling cavity 13 through the oil inlet 1111 can enter the second cooling oil passage 234, flow to the other end of the stator core 21 along the axial direction of the stator core 21 as shown in fig. 3 and 46, and then flow out through the oil outlet 1121. Since the stator wedges 23 are heat conductive members, the cooling oil in the second cooling oil passage 234 cools the inner portion of the stator core 21 and the portion of the stator coil 22 located in the stator slot 215, thereby further improving the heat dissipation efficiency of the motor.

Because the position where the temperature of the stator assembly 2 is the highest is generally at the position of the stator tooth slot 215, the existing cooling scheme cannot directly cool the position, and the existing cooling scheme cools the outside of the stator assembly 2 to indirectly take away part of the heat at the position of the stator tooth slot 215. In the scheme, the second cooling oil channel 234 can directly introduce the cooling oil into the position of the stator tooth slot 215, so that the inner side part of the stator core 21 and the part of the stator coil 22 in the stator tooth slot 215 at the position can be cooled, and the cooling efficiency of the motor can be obviously improved.

As such, the two axial end portions, the outer side portion, and the inner side portion of the stator core 21 can simultaneously dissipate heat, and as shown in fig. 3 and 46, the heat dissipation capability of the stator core 21 is greatly improved. In addition, the heat exchange between the outside and inside of the end winding 221 of the stator coil 22 and the portion of the stator coil 22 located in the stator slot 215 can be achieved, and the heat dissipation capability of the stator coil 22 is greatly improved. Therefore, the heat dissipation efficiency of the motor is greatly improved, the heating requirement can be met, and the heat dissipation of the stator assembly 2 is not required to be assisted by the rotor assembly 3 in an oil throwing mode, so that the oil stirring loss is avoided.

In an exemplary embodiment, as shown in fig. 27, 28, 29 and 31, both ends of the radially outer side wall of the stator slot wedge 23 are respectively provided with a first notch 231 and a second notch 232 communicating with the second cooling oil passage 234, the first notch 231 is provided to communicate with the cooling chamber 13 on the oil inlet 1111 side, the second notch 232 is provided to communicate with the cooling chamber 13 on the oil outlet 1121 side, and since the two stator end plates (the first stator end plate 211 and the second stator end plate 212) are in contact with the core main body 213, the notches are provided so that the cooling oil in the cooling chamber 13 can enter the second cooling oil passage 234.

Alternatively, as shown in fig. 32, 33 and 35, a third notch 233 penetrating through both ends of the stator slot wedge 23 is provided on the radial outer side wall of the stator slot wedge 23, and the third notch 233 is provided to communicate the cooling cavity 13 on the oil inlet 1111 side and the cooling cavity 13 on the oil outlet 1121 side, and further communicate the oil inlet 1111 and the oil outlet 1121 of the motor.

The first gap 231 is provided at the position of the stator wedge 23 corresponding to the first end of the stator core 21 in the axial direction, and it is ensured that the cooling oil flowing through the side end winding 221 can enter the second cooling oil passage 234 through the first gap 231. The second notch 232 is disposed at a position of the stator slot wedge 23 corresponding to the axial second end of the stator core 21, so that the cooling oil in the second cooling oil channel 234 can flow out through the side end winding 221, and further flow out through the oil outlet 1121.

Alternatively, the stator slot wedge 23 may be configured to be completely penetrated, and the third notch 233 may be formed by communicating the first notch 231 with the second notch 232 in the above-described embodiment, so that the cooling oil in the second cooling oil passage 234 may be ensured to enter and exit.

Of course, the stator core 21 may not include the stator slot wedges 23, and the radially inner ends of the stator slots 215 may be closed.

In an exemplary embodiment, the stator slots 215 are provided with a stop shoulder 2151 for stopping the stator slot wedges 23, as shown in fig. 25 and 26. The retaining shoulder 2151 can play a role in positioning and limiting the stator slot wedge 23, so that the stator slot wedge 23 can be rapidly and accurately mounted in place.

In an exemplary embodiment, the stator core 21 is processed by: after the stator punching is firstly completed, the iron core main body 213 is formed by laminating and welding. Then the stator slot wedges 23 are uniformly installed. Then, glue is applied to the side of the first stator end plate 211 where the oil inlet flow passage 2113 is provided and the side of the second stator end plate 212 where the oil outlet flow passage 2123 is provided, and then the side of the first stator end plate 211 where the glue is applied is pressed against the front end of the core main body 213, and the side of the second stator end plate 212 where the glue is applied is pressed against the rear end of the core main body 213. Finally stator sleeve 214 is assembled.

As shown in fig. 16, the present embodiment also provides a stator assembly 2, including: the stator core 21 and the stator coil 22 according to any one of the above embodiments. The stator coil 22 is fixed to the stator core 21.

The stator assembly 2 provided in the embodiment of the present application includes the stator core 21 according to any one of the above embodiments, so that all the advantages of any one of the above embodiments are provided, and details are not described herein again.

The embodiment of the present application further provides a power assembly, which includes the motor according to any one of the above embodiments, so that all the advantages of any one of the above embodiments are achieved, and details are not described herein again.

In an exemplary embodiment, the powertrain further includes an oil pump 5, an oil cooler 6, and the like, as shown in fig. 47.

The cooling oil is cooled by the oil pump 5 for the rotor assembly 3 and the stator assembly 2 of the motor, flows to the oil cooler 6 through the pipeline, is cooled by the oil cooler 6 and then returns to the oil pump 5 again, and oil circuit circulation is achieved.

In an exemplary embodiment, a water cooling channel 1112 is provided within the motor housing 111. The power assembly further comprises a motor controller 4, a water pump 7, a water cooler 8 and the like, as shown in fig. 48.

The water pump 7 injects low-temperature cooling water into the motor controller 4, the low-temperature cooling water enters the water cooling channel 1112 of the motor shell 111 to cool the stator assembly 2 after cooling the motor controller 4, the high-temperature cooling water flowing out of the motor shell 111 enters the water cooler 8 to be cooled, and the cooled low-temperature cooling water enters the water pump 7 again to realize water path circulation.

As shown in fig. 49, the embodiment of the present application further provides a vehicle 100, which includes wheels, a transmission device, and the motor in any one of the above embodiments, so that all the advantages of any one of the above embodiments are provided, and are not described herein again.

In one example, the motor may be, but is not limited to: a drive motor or a generator or an auxiliary drive motor.

In one example, the motor may drive the wheel to rotate via a transmission.

In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "mouth" structure ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the structures referred to have specific orientations, are configured and operated in specific orientations, and thus, are not to be construed as limiting the present invention.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, or may be connected through two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (15)

1. A stator core characterized in that,

stator core is equipped with the oil feed runner, first cooling oil duct and the runner of producing oil that communicate in proper order, the oil feed runner is established stator core's axial first end portion, the runner of producing oil is established stator core's axial second end portion, first cooling oil duct is established stator core's lateral part.

2. The stator core according to claim 1,

the oil inlet flow passage extends along the radial direction of the stator core, and the radial outer end of the oil inlet flow passage is communicated with the first cooling oil passage; and/or

The oil outlet flow channel extends along the radial direction of the stator core, and the radial outer end of the oil outlet flow channel is communicated with the first cooling oil channel.

3. The stator core according to claim 1, wherein the first cooling oil passage is provided in any one or a combination of any two or more of the following forms:

the first cooling oil duct rotationally extends along the circumferential direction and the axial direction of the stator core and is spiral; or

The first cooling oil duct extends along the axial direction of the stator core and is linear; or

The first cooling oil passage comprises a plurality of annular oil passages extending along the circumferential direction of the stator core and a gap oil passage which is positioned between two adjacent annular oil passages and is communicated with the two adjacent annular oil passages; or

The first cooling oil passage is net-shaped.

4. The stator core according to claim 1,

the oil inlet flow channel is positioned inside the stator core, a first oil inlet hole is formed in the first axial end of the stator core, the inlet of the first oil inlet hole penetrates through the end face of the first axial end of the stator core, and the outlet of the first oil inlet hole is communicated with the oil inlet flow channel; and/or

The oil outlet flow channel is located inside the stator core, a first oil outlet is formed in the axial second end portion of the stator core, an inlet of the first oil outlet is communicated with the oil outlet channel, and an outlet of the first oil outlet penetrates through the end face of the axial second end portion of the stator core.

5. The stator core according to claim 1,

a second oil inlet hole is formed in the first axial end portion of the stator core and corresponds to the radial middle of the stator teeth of the stator core, and the second oil inlet hole is communicated with the oil inlet flow channel; and/or

The axial second end of stator core is equipped with the second oil outlet, the second oil outlet with the radial middle part of stator core's stator tooth corresponds the setting, just the second oil outlet intercommunication the runner of producing oil.

6. The stator core according to any one of claims 1 to 5, comprising:

an iron core main body;

a first stator end plate connected to an axial first end of the core body, the first stator end plate forming an axial first end of the stator core;

the second stator end plate is connected with the axial second end of the iron core main body and forms an axial second end part of the stator iron core; and

and the stator sleeve is sleeved on the outer side of the iron core main body and is provided with the first cooling oil duct.

7. The stator core according to claim 6,

the inner side wall of the stator sleeve and/or the outer side wall of the stator sleeve are/is provided with the first cooling oil channel.

8. The stator core according to claim 7,

the stator sleeve is of an integrated structure formed by rolling or an integrated structure formed by die casting.

9. The stator core according to claim 6, wherein the stator core is provided with stator slots, radially inner ends of the stator slots being open; the stator core further includes:

and the stator slot wedge is fixed at the radial inner end of the stator tooth space, is a heat conducting piece and is provided with a second cooling oil channel extending along the axial direction of the stator core.

10. The stator core according to claim 9,

a first notch and a second notch which are communicated with the second cooling oil duct are respectively arranged at two ends of the radial outer side wall of the stator slot wedge, the first notch is communicated with the cooling cavity at the oil inlet side, and the second notch is communicated with the cooling cavity at the oil outlet side; or

The radial outer side wall of the stator slot wedge is provided with a third notch which is communicated with the two ends of the stator slot wedge, and the third notch is arranged to be communicated with the cooling cavity on the oil inlet side and the cooling cavity on the oil outlet side.

11. The stator core according to claim 9,

the stator slot wedge is made of flexible materials to seal the radial inner end of the stator tooth groove.

12. A stator assembly, comprising:

a stator core according to any one of claims 1 to 11; and

and a stator coil fixed to the stator core.

13. An electrical machine comprising a stator assembly according to claim 12.

14. A power assembly comprising the motor of claim 13, an oil pump and an oil cooler, the oil pump being configured to provide circulating power to cooling oil flowing through the stator assembly; and cooling oil passing through the stator assembly enters the oil cooler and is cooled by the oil cooler.

15. A vehicle comprising the powertrain of claim 14.

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