Stator assembly, motor and cooling system for motor

Abstract

The utility model relates to a stator assembly, a motor comprising the stator assembly and a cooling system for the motor. The stator assembly comprises a stator core, a stator winding, a plurality of insulating members and a plurality of slot wedges, the stator core is provided with a plurality of tooth grooves which are arranged on the radial inner side at intervals in the circumferential direction of the stator core, the stator winding is composed of a plurality of conductor elements, a part of each conductor element is arranged in the corresponding tooth groove, each insulating member is arranged in the corresponding tooth groove, and the plurality of slot wedges are arranged in the insulating members. Each insulating component completely surrounds the multiple layers of conductor elements located in the same tooth groove; at least one side of each conductor element is provided with a groove so as to partially define a coolant channel extending along the axial direction of the stator core; each slot wedge engages into a radial opening of a respective tooth socket and abuts against the insulating member. According to the stator assembly provided by the utility model, the conductor element and the insulating member are matched to form the coolant channel, so that the whole winding conductor can be directly cooled by the coolant, the cooling efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a stator component, a motor comprising the stator component and a cooling system for the motor. Background Art

[0002] The motor generally includes a stator with a stator winding and a rotor that can rotate inside the stator. The rotor is driven to rotate by generating an electric current in the stator winding. When an electric current is generated in the stator winding, the stator winding generates heat. A cooling method for the stator winding is known in the prior art, which is to open a cooling channel in the stator core and set an oil guide ring at the end, so that the cooling oil will take away the heat of the stator core when flowing through the cooling channel, and spray to the end of the stator winding through the end of the oil guide ring to achieve cooling of the stator winding. In addition, it is also possible to choose to open a cooling groove in the yoke of the stator lamination, so that a cooling channel for cooling oil to pass through is formed in the stator core formed by stacking a plurality of stator laminations, thereby taking away the heat. However, both of the above cooling methods require that the heat is transferred to the cooling oil in the cooling channel by heat conduction through the stator core and the heat is taken away by the cooling oil, and the cooling efficiency is relatively low. In particular, in this scheme of slotting the yoke, the magnetic field distribution of the motor is also adversely affected, affecting the motor efficiency.

[0003] In addition, there is also a known method of direct cooling in the stator slot in the prior art, that is, by leaving gaps between adjacent copper wires arranged in the tooth slots to form a cooling channel, so that the cooling oil directly flows into the tooth slots, so that the winding or copper wire is immersed in the cooling oil, and the heat is directly taken away without being conducted to the stator core. However, this solution reduces the slot fill rate of the motor because gaps need to be set between adjacent copper wires, resulting in a larger stator volume at the same power.

[0004] Therefore, it is necessary to provide an improved cooling structure for a motor so as to achieve effective cooling of the motor with higher cooling efficiency and without affecting the motor performance. Utility Model Content

[0005] The present invention is proposed based on such background, and its purpose is to solve at least one of the above problems and / or other problems existing in the prior art.

[0006] To achieve the above-mentioned purpose, according to one aspect of the utility model, a stator assembly is provided, the stator assembly comprising a stator core and a stator winding, the stator core having a plurality of tooth slots arranged radially inwardly at intervals along its circumferential direction, the stator winding being composed of a plurality of conductor elements, at least a portion of each conductor element being arranged in a corresponding tooth slot, so that multiple layers of conductor elements are arranged radially in sequence in the same tooth slot, the stator assembly further comprising a plurality of insulating members, each insulating member being arranged in a corresponding tooth slot and, when viewed along the axial direction of the stator core, each insulating member completely surrounds the multiple layers of conductor elements located in the same tooth slot; wherein at least one side of each conductor element is provided with a groove, the groove partially defining a coolant channel extending along the axial direction of the stator core; wherein the stator assembly further comprises a plurality of slot wedges, each of the slot wedges being engaged in a radial opening of a corresponding tooth slot and being held in the tooth slot against the insulating member.

[0007] According to an embodiment of the utility model, the tooth groove is provided with two opposite clamping grooves on two opposite side walls defining the radial opening thereof, and the groove wedge is provided with a clamping portion engaged with the corresponding clamping grooves.

[0008] According to an embodiment of the present invention, the conductor element is provided with a groove on both sides adjacent to the insulating component, so that the coolant channel is defined by the groove and the insulating component.

[0009] According to an embodiment of the present invention, the insulating member is provided with a plurality of protrusions spaced apart from each other on one side thereof surrounding the multi-layer conductor element in the tooth slot, and the protrusions abut against the conductor element in the tooth slot.

[0010] According to one embodiment of the utility model, the stator assembly further includes a first end cover and a second end cover, wherein the first end cover abuts against the stator core at a first axial end side of the stator core and jointly defines an entry end storage cavity connected to an entry end of each coolant channel; the second end cover abuts against the stator core at a second axial end side of the stator core and jointly defines an outlet end storage cavity connected to an outlet end of each coolant channel.

[0011] According to one embodiment of the utility model, the first end cover has a first end wall defining the entry end storage cavity, and a first outer wall and a first inner wall respectively connected to the first end wall and arranged concentrically, wherein an inlet hole communicating with the entry end storage cavity is provided on the first outer wall.

[0012] According to an embodiment of the present utility model, a plurality of leakage holes are arranged on the first end wall, which are distributed at intervals along the circumference thereof and communicate with the fluid of the inlet end storage cavity.

[0013] According to one embodiment of the utility model, the second end cover has a second end wall defining the outlet end storage cavity, and a second outer side wall and a second inner side wall respectively connected to the second end wall and arranged concentrically, wherein a plurality of outflow holes connected to the outlet end storage cavity are circumferentially arranged on the second outer side wall.

[0014] According to an embodiment of the present utility model, an overflow hole is further provided at the highest position of the second outer side wall, and the overflow hole has a larger opening cross-sectional area than the outflow hole.

[0015] According to one embodiment of the present invention, the first end cover and / or the second end cover is made of plastic material.

[0016] According to another aspect of the utility model, a motor is provided, which includes a housing and a stator assembly as described above, wherein the housing is provided with an inlet channel and a return channel, wherein the inlet channel is connected to an inlet end storage chamber via an inlet hole on a first end cover of the stator assembly, and the return channel is connected to an outlet end storage chamber via a plurality of outflow holes and overflow holes on a second end cover of the stator assembly.

[0017] According to another aspect of the utility model, a cooling system for a motor is provided, which includes a pump, the motor as described above, and a storage tank storing coolant, wherein the storage tank is fluidically connected to a return channel of the motor and is fluidically connected to an inlet channel of the motor through the pump, so that a coolant circulation loop is formed in the cooling system.

[0018] Compared with the prior art, the stator assembly or motor according to the utility model can achieve at least one of the following technical effects: by arranging a groove on at least one side of the conductor element to form a plurality of coolant channels in the tooth slot through the cooperation of the conductor element and the insulating component, the stator winding can be directly cooled by the coolant, thereby greatly improving the cooling efficiency and reducing the production cost; because the conductor element is fixed in the tooth slot by the protrusion on the inner side of the insulating component, the fixing paint and the like required to be filled for fixing the conductor element in the traditional fixing method are omitted, thereby increasing the channel space available for the coolant; a separate slot wedge is arranged for each tooth slot in a one-to-one correspondence, so that most of the coolant flowing through the tooth slot can be blocked in a roughly sealed manner to better ensure the pressure in the coolant circulation loop; and by using the end cover storage cavity made of plastic material, a higher overall structural rigidity is achieved and noise, vibration and other problems are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The features and advantages of the present invention will be clearly understood through the detailed description provided below with reference to the accompanying drawings. It should be understood that the following drawings are merely schematic and not necessarily drawn to scale, and thus cannot be regarded as limiting the present invention, wherein:

[0020] Figure 1 A perspective view of a stator assembly according to an exemplary embodiment of the present invention is shown.

[0021] Figure 2 Show Figure 1 The stator assembly shown is a cross-sectional view taken along the axial middle position of the stator core.

[0022] Figure 3 Show Figure 2 An enlarged view of section A of the stator assembly is shown.

[0023] Figure 4 Show Figure 2 A partial perspective view of a conductor element of a stator assembly is shown.

[0024] Figure 5 Show Figure 2 A partial perspective view of an insulating component of a stator assembly is shown.

[0025] Figure 6 Show Figure 2 A partial perspective view of a slot wedge of a stator assembly is shown.

[0026] Figure 7 Show Figure 1 A perspective view of a first end cap of a stator assembly is shown.

[0027] Figure 8 Show Figure 1 A perspective view of the second end cover of the stator assembly is shown.

[0028] Fig. 9 A schematic diagram of a cooling system according to an exemplary embodiment of the present invention is shown.

[0029] Description of reference numerals:

[0030] 1. stator core; 11. tooth slot; 111. snap-fit ​​slot; 2. stator winding; 21. conductor element; 211. at least a portion of the conductor element; 212. groove; 3. insulating member; 31. protrusion; 4. slot wedge; 41. snap-fit ​​portion; 5. first end cover; 51. first end wall; 511. leakage hole; 52. first outer wall; 521. inlet hole; 53. first inner wall; 6. entrance end storage chamber; 7. second end cover; 71. second end wall; 72. second outer wall; 721. outlet hole; 722. overflow hole; 73. second inner wall; 8. outlet end storage chamber; 9. shell; 91. inlet channel; 92. outlet channel; 10. pump; 20. storage tank. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, many specific details are set forth so that those skilled in the art can more fully understand and implement the present invention. However, it is obvious to those skilled in the art that the implementation of the present invention may not have some of these specific details. In addition, it should be understood that the present invention is not limited to the specific embodiments described. On the contrary, any combination of the features and elements described below may be considered to implement the present invention, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments and advantages are for illustrative purposes only and should not be regarded as elements or limitations of the claims unless clearly stated in the claims.

[0032] In the following, terms such as "first", "second", etc. are used to describe the elements of the present application. These terms are only used to distinguish the various elements, and are not used to limit the nature, order or number of these elements. The terms "including" and "having" are used to express an open-ended inclusive meaning, and mean that there may be additional elements / components in addition to the listed elements / components.

[0033] Figure 1 FIG. 2 shows a stator assembly according to an embodiment of the present utility model. Figure 1 As shown, the stator assembly according to this embodiment includes a stator core 1, a stator winding 2, a plurality of insulating members 3 (such as insulating paper) and a plurality of slot wedges 4 ( Figure 3 ). Figure 2 The stator core 1 has a plurality of slots 11 arranged radially inwardly at intervals along its circumferential direction. The stator winding 2 is composed of a plurality of conductor elements 21 (e.g., flat copper wires with a rectangular cross section). At least a portion 211 of each conductor element 21 is arranged in a corresponding slot 11, so that multiple layers of conductor elements 21 are arranged in sequence in the radial direction in the same slot 11, such as Figure 2 It should be noted that although Figures 1 to 3FIG. 1 shows that six layers of conductor elements are contained in the tooth slot 11 , but those skilled in the art may also select other suitable number of layers of conductor elements according to actual design and winding method.

[0034] As an example, each conductor element 21 may be in the form of a hairpin coil (not specifically shown in the figure), which may include two opposite main body parts and a connecting part connected between the two main body parts, and may also include two end parts extending from the two main body parts respectively. After the conductor element 21 is inserted into the tooth slot 11, the end parts of multiple conductor elements 21 are welded together according to the circuit connection requirements of the stator winding, thereby forming a complete stator winding. Multiple conductor elements 21 are arranged in a certain arrangement so that the two main body parts of the conductor elements are arranged in different tooth slots 11, so that multiple layers of conductor elements 21 are arranged in sequence along the radial direction of the stator core 1 in the same tooth slot 11.

[0035] Continue to see Figure 3 When viewed along the axial direction of the stator core 1, an insulating member 3 (for example, in the form of insulating paper) is arranged in each tooth slot 11. Corresponding parts 211 of multiple conductor elements 21 are stacked in the tooth slot 11. The insulating member 3 completely surrounds the outer periphery of the whole body composed of the multi-layer conductor elements 21, which is conducive to improving the insulation performance of the multi-layer conductor elements 21. Advantageously, at least one side of each conductor element 21 is provided with a groove 212, which partially defines or provides a coolant channel extending along the axial direction of the stator core 1.

[0036] It is understood that the groove 212 can be provided on any one side or multiple sides of each conductor element 21, for example, it can be provided on one side of the conductor element 21 facing the adjacent conductor element 21 or on one side or both sides of the conductor element 21 adjacent to the insulating member 3. Figure 3 and Figure 4 As shown, a groove 212 is provided on each of the two sides of each conductor element 21 adjacent to the insulating member 3, so that the conductor element has a substantially "H"-shaped cross section, so that when the insulating member 3 completely surrounds the multi-layer conductor element 21, the coolant channel is defined by the groove 212 and the insulating member 3 together. In this way, while minimizing the impact on the slot fill rate of the motor, a coolant channel for the coolant to flow through is provided to achieve direct cooling of the winding conductor in the tooth slot.

[0037] like Figure 3 and Figure 5As shown, the insulating member 3 is provided with a plurality of protrusions 31 spaced apart from each other on the side wall of the insulating member 3 surrounding the multi-layer conductor element 21 in the tooth slot 11, and these protrusions 31 abut against the corresponding conductor element 21 to fix the conductor element. Since the conductor element 21 is fixed in the tooth slot 11 by the protrusions 31 on the inner side of the insulating member 3, the fixing paint required to be filled in the traditional fixing method is omitted, thereby avoiding the channel space available for the coolant to be occupied due to the filling of the fixing paint.

[0038] Back to Figure 3 Advantageously, a plurality of slot wedges 4 are provided corresponding to the plurality of tooth slots 11. Each slot wedge 4 can be engaged in the radial opening of the corresponding tooth slot 11. The slot wedge 4 abuts against the insulating member 3 and can be held at the radial opening of the tooth slot 11. In this embodiment, the slot wedge 4 is held in engagement at the opening of the tooth slot 11 by, for example, a form-locking method. Figure 3 and Figure 6 The tooth groove 11 is provided with two opposite snap-fit ​​grooves 111 on two opposite side walls defining its radial opening. Correspondingly, the slot wedge 44 is provided with two snap-fitting portions 41 snap-fitting with the two snap-fitting grooves 111. Each snap-fitting portion 41 is embedded in the snap-fitting groove 111 corresponding thereto, so that the slot wedge 4 is retained in the tooth groove 11 by the engagement of the snap-fitting portion 41 with the snap-fitting groove 111. It should be understood that the slot wedge 4 is used to block most of the coolant flowing through the tooth groove 11 in a substantially sealed manner, thereby preventing a large amount of coolant from flowing out of the radial opening of the tooth groove 11.

[0039] According to a further embodiment of the stator assembly, reference is made to Figure 1 and Figure 7 As shown, the stator assembly may further include a first end cover 5. The first end cover 5 is formed with a cavity with an opening, and abuts against the stator core 1 at the first axial end side of the stator core 1. The opening of the cavity is closed by the first axial end side of the stator core 1, so that the cavity can constitute an entry end storage cavity 6 for temporarily storing coolant, and the coolant can enter the entry end of the coolant channel partially defined by the groove 212 of the conductor element 21 through the entry end storage cavity 6. Figure 1 It is also shown that when the first end cover 5 abuts against the first axial end side of the stator core 1 , the connection parts (or end parts) of the plurality of conductor elements 21 can extend into the first end cover 5 and be immersed in the coolant entering the end storage cavity 6 .

[0040] Specifically, continue to refer to Figure 1 and Figure 7The first end cover 5 may include a first end wall 51 and a first outer side wall 52 and a first inner side wall 53 arranged concentrically. The first end wall 51 is generally annular, the first outer side wall 52 extends axially to one side from the outer periphery of the first end wall 51, and the first inner side wall 53 extends axially from the inner periphery of the first end wall 51 in the same direction as the first outer side wall 52, thereby forming a generally annular cavity. An inlet hole 521 communicating with the inlet end storage chamber 6 is provided on the first outer side wall 52, so that the coolant can enter the inlet end storage chamber 6 from the outside of the stator assembly.

[0041] Figure 1 and Figure 7 It is also shown that a plurality of leakage holes 511 are arranged on the first end wall 51 and are spaced apart along the circumference thereof. The leakage holes 511 penetrate the first end wall 51, so as to be connected with the inlet end storage chamber 6. The aperture of the leakage holes 511 is usually small, which is conducive to ensuring the pressure so that more coolant can smoothly enter the coolant channel of the stator winding 2 through the inlet end storage chamber 6. In addition, the arrangement of these leakage holes 511 can also avoid the formation of a dead zone due to the inability of the coolant to flow near the first end wall 51, thereby reducing the phenomenon of excessively high local temperature in the first end cover 5.

[0042] Furthermore, refer to Figure 1 and Figure 8 As shown, the stator assembly may further include a second end cover 7. Similarly, the second end cover 7 is formed with a cavity with an opening, and abuts against the stator core 1 at the second axial end side of the stator core 1. The opening of the cavity is closed by the second axial end side of the stator core 1, so that the cavity can constitute an outlet end storage cavity 8 for temporarily storing coolant, and the coolant can flow out to the outlet end storage cavity 8 through the outlet end of the coolant channel partially defined by the groove 212 of the conductor element 21. Figure 1 It is also shown that when the second end cover 7 abuts against the second axial end side of the stator core 1 , the end portions (or connecting portions) of the plurality of conductor elements 21 can extend into the second end cover 7 and be immersed in the coolant in the outlet end storage cavity 8 .

[0043] Specifically, continue to refer to Figure 1 and Figure 8 The second end cover 7 may include a second end wall 71 and a second outer side wall 72 and a second inner side wall 73 arranged concentrically. The second end wall 71 is generally annular, and the second outer side wall 72 extends axially to one side from the outer periphery of the second end wall 71, and the first inner side wall 53 extends axially from the inner periphery of the second end wall 71 in the same direction as the second outer side wall 72, thereby forming a generally annular cavity. A plurality of outflow holes 721 communicating with the outlet end storage chamber 8 are circumferentially arranged on the second outer side wall 72, so that the coolant can flow out of the stator assembly from the outlet end storage chamber 8.

[0044] Figure 1 and Figure 8 It is also shown that an overflow hole 722 is provided at the highest position of the second outer side wall 72. The overflow hole 722 has a larger opening cross-sectional area than the outflow hole 721. It can be understood that, for example, when the motor is placed in a horizontal direction so that the axial direction of the stator assembly is in a substantially horizontal direction, the liquid level of the coolant in the outlet end storage chamber 8 gradually increases with the increase of the storage amount. When the coolant fills the entire outlet end storage chamber 8 and cannot flow out of the second end cover 7 from the outflow hole 721 in time, the excess coolant can be smoothly discharged from the second end cover 7 through the overflow hole 722.

[0045] Figure 8 , a plurality of outflow holes 721 are arranged at equal intervals along a portion of the circumference of the second outer side wall 72, and the overflow holes 722 are arranged on the topmost portion of the second outer side wall 72. However, it should be known that those skilled in the art may conceive of arranging the outflow holes 721 and the overflow holes 722 in other arrangements.

[0046] In the above embodiment, at least one of the first end cover 5 and the second end cover 7 can be made of plastic material. This is advantageous, especially when the end cover is mounted in conjunction with the housing of the motor, it can ensure good overall structural rigidity. In addition, since the damping of plastic material is relatively large, when it is used to manufacture the first end cover 5 and / or the second end cover 7, it is not easy to cause noise and vibration problems.

[0047] The utility model also relates to a motor including the above-mentioned stator assembly. Fig. 9 As shown, the motor may include a housing 9 and a stator assembly. An inlet channel 91 is provided on the upper left side of the housing 9, and the inlet channel 91 can be connected to the inlet end storage chamber 6 via the inlet hole 521 on the first end cover 5. A return channel 92 is provided on the lower side of the housing 9, and the return channel 92 can be connected to the outlet end storage chamber 8 via multiple outlet holes 721 and overflow holes 722 on the second end cover 7. In this way, after the coolant enters the inlet end storage chamber 6 via the inlet channel 91 and the inlet hole 521, it can first fill the inlet end storage chamber 6, and then most of the coolant can flow through the coolant channel to directly cool the stator core 1 and the stator winding 2, and enter the outlet end storage chamber 8 after taking away the heat of the stator core 1 and the stator winding 2; a small amount of coolant can flow out of the inlet end storage chamber 6 via the multiple leakage holes 511 on the first end cover 5. The coolant entering the outlet end storage chamber 8 then flows out of the outlet end storage chamber 8 via the multiple outlet holes 721. When the coolant is not discharged in time from the multiple outflow holes 721 and reaches the overflow hole 722, the coolant can also be discharged to the outlet storage chamber 8 through the overflow hole 722. Those skilled in the art should know that Fig. 9 The positions of the inlet channel 91 and the return channel 92 shown include but are not limited to the positions shown in the figure, and can be set as needed.

[0048] The utility model also relates to a cooling system for a motor. Fig. 9 As shown, the cooling system may include a pump 10, the motor as described above, and a storage tank 20 (e.g., a reducer oil tank) storing coolant. The storage tank 20 is in fluid communication with the return channel 92 of the motor, and is in fluid communication with the inlet channel 91 of the motor through the pump. The storage tank 20 is also in fluid communication with a plurality of leakage holes 511 on the first end cover 5 (e.g., through the leakage channel on the housing 9), thereby forming a cooling system as shown in FIG. Fig. 9 The coolant circulation loop is shown by the arrow in the middle. Due to the design of the leakage hole 511 on the first end cover 5 and the outflow hole 721 and the overflow hole 722 on the second end cover 7, after the coolant flows out of the inlet storage chamber 6 and the outlet storage chamber 8, a part of the coolant is allowed to return to the storage tank 20 through the leakage channel on the shell 9, and the other part is allowed to return to the storage tank 20 through the return channel 92. It should be known that the cooling system of the utility model can be applied to oil-cooled transformers, industrial motors, wind and water generators, etc.

[0049] As described above, in the stator assembly according to the utility model, a groove 212 is provided on at least one side of the conductor element 21, and a plurality of conductor elements 21 arranged radially in the same tooth slot 11 are fixed via corresponding insulating members 3 (such as insulating paper), and a slot wedge 4 sealingly engaged with the radial opening of the tooth slot is also provided in each tooth slot 11, so that a plurality of coolant channels in the tooth slot are formed by the cooperation of the conductor element 21 and the insulating member 3. In addition, by providing a first end cover 5 and a second end cover 7 at both ends of the stator core 1, an inlet end storage cavity 6 and an outlet end storage cavity 8 are formed at both ends of the stator core. In the entire system combined with a pumping device, for example, under the action of the oil pressure provided by the pump 10, all the conductor elements 21 of the stator winding can be immersed in the coolant, and the part of the conductor element exposed or inserted into the tooth slot of the stator core 1 can be directly cooled by the coolant, thereby greatly improving the cooling efficiency. In addition, since the conductor element 21 is fixed in the tooth slot 11 through the protrusion 31 on the inner side of the insulating member 3, the fixing paint required in the traditional fixing method is omitted, thereby avoiding the channel space available for the coolant to be occupied due to the filling of the fixing paint. In other words, this method of directly fixing the conductor element in the tooth slot by using the insulating member increases the available coolant channel space in the tooth slot 11. Furthermore, a separate slot wedge 4 is set for each tooth slot one by one, so that most of the coolant flowing through the tooth slot 11 can be blocked in a substantially sealed manner to better ensure the pressure in the coolant circulation loop. In addition, since the first end cover 5 and the second end cover 7 are made of plastic, the overall structural rigidity of the first end cover 5 and the second end cover 7 installed with the housing 9 is good, the damping is large, and it is not easy to cause noise and vibration problems. In addition, in the embodiment of the utility model, since only the groove 212 is formed on the side of the conductor element 21, it is only necessary to adjust the molding mold, which is easy to implement and reduces the production cost.

[0050] For those skilled in the art, various modifications and variations may be made to the embodiments disclosed above without departing from the scope or spirit of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from the practice of the utility model disclosed in this specification. This specification and the examples disclosed therein should be considered to be illustrative only, and the true scope of the utility model is specified by the appended claims and their equivalents.

Claims

1. A stator assembly, comprising a stator core (1) and a stator winding (2), wherein the stator core (1) has a plurality of tooth slots (11) arranged radially inwardly at intervals along its circumferential direction, and the stator winding (2) is composed of a plurality of conductor elements (21), at least a portion (211) of each conductor element is arranged in a corresponding tooth slot (11), so that multiple layers of conductor elements (21) are arranged in sequence in the radial direction in the same tooth slot (11), characterized in that: The stator assembly further comprises a plurality of insulating components (3), each insulating component (3) being arranged in a corresponding tooth slot (11); when viewed along the axial direction of the stator core (1), each insulating component (3) completely surrounds the multi-layer conductor element (21) located in the same tooth slot (11); Wherein, at least one side of each conductor element (21) is provided with a groove (212), and the groove (212) partially defines a coolant channel extending along the axial direction of the stator core (1); The stator assembly further comprises a plurality of slot wedges (4), each of the slot wedges (4) being engaged in a radial opening of a corresponding tooth slot (11) and being held in the tooth slot (11) by abutting against the insulating member (3).

2. The stator assembly according to claim 1, characterized in that: The tooth groove (11) is provided with two opposite clamping grooves (111) on two opposite side walls defining its radial opening, and the slot wedge (4) is provided with a clamping portion (41) engaged with the corresponding clamping grooves (111).

3. The stator assembly according to claim 2, characterized in that: The conductor element (21) is provided with a groove (212) on both sides adjacent to the insulating component (3), so that the coolant channel is defined by the groove (212) and the insulating component (3).

4. The stator assembly according to claim 3, characterized in that: The insulating member (3) is provided with a plurality of protrusions (31) spaced apart from each other on one side of the insulating member (3) surrounding the multilayer conductor element (21) in the tooth slot (11); the protrusions (31) abut against the conductor element (21) in the tooth slot (11).

5. The stator assembly according to any one of claims 1 to 4, characterized in that: The stator assembly further comprises a first end cover (5) and a second end cover (7), wherein the first end cover (5) abuts against the stator core (1) at a first axial end side of the stator core (1) and together define an inlet end storage chamber (6) communicating with an inlet end of each coolant channel; and the second end cover (7) abuts against the stator core (1) at a second axial end side of the stator core (1) and together define an outlet end storage chamber (8) communicating with an outlet end of each coolant channel.

6. The stator assembly according to claim 5, characterized in that The first end cover (5) has a first end wall (51) defining the inlet end storage chamber (6), and a first outer wall (52) and a first inner wall (53) respectively connected to the first end wall and arranged concentrically; wherein an inlet hole (521) communicating with the inlet end storage chamber (6) is provided on the first outer wall (52).

7. The stator assembly according to claim 6, characterized in that A plurality of leakage holes (511) are arranged on the first end wall (51) and are distributed at intervals along its circumference and are in fluid communication with the inlet end storage chamber (6).

8. The stator assembly according to claim 5, characterized in that The second end cover (7) has a second end wall (71) defining the outlet end storage chamber (8), and a second outer wall (72) and a second inner wall (73) respectively connected to the second end wall and arranged concentrically, wherein a plurality of outflow holes (721) communicating with the outlet end storage chamber (8) are circumferentially arranged on the second outer wall (72).

9. The stator assembly according to claim 8, characterized in that An overflow hole (722) is also provided at the highest position of the second outer side wall (72); the overflow hole (722) has a larger opening cross-sectional area than the outflow hole (721).

10. The stator assembly according to claim 5, characterized in that The first end cover (5) and / or the second end cover (7) are made of plastic material.

11. A motor, characterized in that: The motor comprises a housing (9) and a stator assembly according to any one of claims 1 to 10, the housing (9) being provided with an inlet channel (91) and a return channel (92), the inlet channel (91) being connected to an inlet end storage chamber (6) via an inlet hole (521) on a first end cover (5) of the stator assembly, and the return channel (92) being connected to an outlet end storage chamber (8) via a plurality of outflow holes (721) and overflow holes (722) on a second end cover (7) of the stator assembly.

12. A cooling system for a motor, characterized in that: The cooling system comprises a pump (10), the motor according to claim 11 and a storage tank (20) storing a coolant, wherein the storage tank (20) is fluidically connected to a return channel (92) of the motor and is fluidically connected to an inlet channel (91) of the motor through the pump (10), so that a coolant circulation loop is formed in the cooling system.

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