Stator assembly and disc motor

Abstract

The utility model discloses a kind of stator assembly and disc motor, stator assembly includes intermediate outer shell and annular sealing plate;Intermediate outer shell is annularly arranged on the outer circumferential side of iron core structure;Annular sealing plate is annularly arranged on the outer circumferential side of intermediate outer shell, and liquid cooling flow channel is formed between annular sealing plate and intermediate outer shell, inlet of liquid cooling flow channel is provided on annular sealing plate, and the inner wall of intermediate outer shell is provided with liquid outlet hole along its radial direction, and liquid outlet hole is used to communicate with liquid cooling flow path in iron core structure;Wherein, on the axial direction of intermediate outer shell, liquid outlet hole is set to be dislocated with liquid cooling flow channel, and the inner wall of liquid cooling flow channel is provided with communication hole at the local position corresponding to intermediate outer shell, communication hole extends along the axial direction of intermediate outer shell, and liquid cooling flow channel and liquid outlet hole are communicated.

Description

Technical Field

[0001] This utility model relates to the field of motor equipment technology, and in particular to a stator assembly and a disc motor. Background Technology

[0002] Disc motors have high torque density and broad application prospects. Taking a single-stator dual-rotor motor as an example, the motor includes a stator assembly and two rotors located on either side of the stator assembly. Currently, the stator assembly of a single-stator dual-rotor motor typically features a yokeless segmented iron core. However, for such a yokeless stator, centralized heat dissipation through indirect cooling is not possible; therefore, current methods for cooling yokeless stators typically involve directly spraying cooling oil onto the stator. The stator assembly housing usually consists of two nested housings with an oil ring between them. Oil passages connecting to the oil ring are located in the slot wedges between the segmented iron cores, and oil is sprayed onto the iron cores through oil spray holes on the slot wedges. However, during the assembly and fixing of the two housings, it is very easy to block the oil holes connecting to the slot wedges on the housings, resulting in oil passage blockage. Utility Model Content

[0003] The main objective of this invention is to provide a stator assembly and a disc motor that can ensure unobstructed cooling flow after the stator assembly is assembled and fixed.

[0004] To achieve the above objectives, the present invention provides a stator assembly comprising:

[0005] The intermediate outer shell is arranged around the outer periphery of the iron core structure; and,

[0006] An annular sealing plate is arranged around the outer periphery of the intermediate outer shell. A liquid cooling channel is formed between the annular sealing plate and the intermediate outer shell. The annular sealing plate is provided with an inlet that communicates with the liquid cooling channel. The inner wall of the intermediate outer shell is provided with an outlet hole along its radial direction. The outlet hole is used to communicate with the liquid cooling channel in the iron core structure.

[0007] In the intermediate outer shell, the liquid outlet is offset from the liquid cooling channel along the axial direction, and the inner wall of the liquid cooling channel is provided with a connecting hole at a local position corresponding to the intermediate outer shell. The connecting hole extends along the axial direction of the intermediate outer shell and connects the liquid cooling channel and the liquid outlet.

[0008] Preferably, an annular groove is formed on the side surface of the intermediate outer shell facing the annular sealing plate along its circumference, and the annular sealing plate covers the opening of the annular groove to jointly enclose and form the liquid cooling channel;

[0009] The liquid outlet is located on the inner wall of the intermediate outer shell and is offset from the annular groove in the axial direction of the intermediate outer shell;

[0010] The connecting hole is located on the wall of the annular groove and connects the annular groove with the liquid outlet hole.

[0011] Preferably, the connecting hole is located on the side wall of the annular groove;

[0012] Along the radial direction of the intermediate outer shell and on the side near the annular sealing plate, the wall of the communicating hole penetrates the intermediate outer shell;

[0013] Along the radial direction of the intermediate outer shell and on the side away from the annular sealing plate, the wall of the connecting hole is flush with the bottom of the annular groove.

[0014] Preferably, the liquid outlet extends through the intermediate outer shell along the radial direction of the intermediate outer shell and on the side near the annular sealing plate.

[0015] Preferably, the connecting hole is located at the bottom of the annular groove, and one end of the connecting hole extends toward the side wall of the annular groove adjacent to it and penetrates part of the intermediate outer shell.

[0016] Preferably, on one side corresponding to the connecting hole, a groove is formed on the end face of the intermediate outer shell. The groove extends radially along the intermediate outer shell, such that the groove wall on the side closest to the inner wall of the intermediate outer shell penetrates the intermediate outer shell, and its bottom covers the connecting hole. The bottom of the groove forms a through hole at the position corresponding to the connecting hole, and the through hole communicates with the connecting hole.

[0017] The stator assembly also includes an outer ring cover plate, which is disposed on the end face and covers the groove to seal the groove opening of the groove in the axial direction of the intermediate outer shell and to form the liquid outlet hole on the inner wall of the intermediate outer shell.

[0018] Preferably, the two end faces of the intermediate outer shell in its axial direction are flush with the two end faces of the annular sealing plate to form a flat mounting surface.

[0019] Preferably, the stator assembly further includes a guide structure, which includes a guide portion and a mating portion that are inserted into each other. One of the guide portion and the mating portion is located in the intermediate outer shell, and the other is correspondingly located in the annular sealing plate.

[0020] Preferably, the guide structure further includes a plug and a socket that fit together, wherein one of the plug and the socket is located in the intermediate outer shell and the other is located in the annular sealing plate;

[0021] In this configuration, one of the pin and the socket is configured as the guide portion, and the other is configured as the mating portion.

[0022] This utility model also proposes a disc motor, which includes the stator assembly described above.

[0023] The technical solution provided by this utility model has at least the following advantages:

[0024] The stator assembly provided by this utility model includes a nested intermediate outer shell and an annular sealing plate. The intermediate outer shell is arranged around the outer periphery of the core structure, and a liquid cooling flow path for cooling the winding structure is formed within the core structure. A liquid cooling flow channel is formed between the annular sealing plate and the intermediate outer shell, and the annular sealing plate has an inlet port communicating with the liquid cooling flow channel. The inner wall of the intermediate outer shell has an outlet hole communicating with the liquid cooling flow channel. By providing a connecting hole in the inner wall of the liquid cooling flow channel, the liquid cooling flow channel and the outlet hole are connected. The liquid cooling medium in the liquid cooling flow channel first flows along the axial direction of the intermediate outer shell to the connecting hole, and then flows through the outlet hole to the liquid cooling flow path within the core structure. Thus, during the assembly of the intermediate outer shell and the annular sealing plate, the connection between the connecting hole and the outlet hole will not be affected, thereby ensuring the connection between the liquid cooling flow channel and the liquid cooling flow path. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 A schematic diagram of a stator assembly according to an embodiment of the present invention;

[0027] Figure 2 for Figure 1 An exploded view of the structure of the first embodiment of the stator assembly;

[0028] Figure 3 for Figure 1 A cross-sectional view along AA of the first embodiment of the stator assembly;

[0029] Figure 4 for Figure 3 An enlarged schematic diagram of part B of the stator assembly;

[0030] Figure 5 for Figure 1 A schematic diagram of the stator assembly with respect to the intermediate outer shell and the annular sealing plate (first embodiment);

[0031] Figure 6 for Figure 5 An exploded view of the stator assembly with respect to the intermediate outer shell and the annular sealing plate;

[0032] Figure 7 for Figure 5 A cross-sectional view of the stator assembly along CC;

[0033] Figure 8 for Figure 1 A schematic diagram of the stator assembly with respect to the intermediate outer shell and the annular sealing plate (second embodiment);

[0034] Figure 9 for Figure 8 A cross-sectional view of the stator assembly along DD;

[0035] Figure 10 for Figure 9 An exploded view of the stator assembly;

[0036] Figure 11 This is a schematic diagram of one embodiment of a disc motor provided by the present invention.

[0037] Explanation of icon numbers:

[0038] 1000 Disc Motor; 100 Stator Assembly; 1 Intermediate Outer Housing; 11 Liquid Outlet; 12 Connecting Hole; 13 End Face; 14 Tank; 15 Through Hole; 2 Annular Sealing Plate; 21 Liquid Inlet; 3 Liquid Cooling Channel; 31 Annular Groove; 4 Mounting Surface; 5 Outer Ring Cover Plate; 6 Core Structure; 61 Liquid Cooling Flow Path; 62 Tooth Section; 63 Slot Wedge; 631 Inlet; 632 Spray Hole; 7 Winding Structure; F1 Radial; F2 Axial; F3 Circumferential; 200 End Cover.

[0039] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0042] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0043] Currently, the stator assembly of a single-stator dual-rotor motor typically features a yokeless segmented iron core. For this type of yokeless stator, centralized heat dissipation via indirect cooling is not feasible. Therefore, current methods for cooling yokeless stators typically involve directly spraying cooling oil onto the stator. The stator assembly housing usually consists of two nested housings with an oil ring between them. Oil passages connecting to the oil ring are located within the slot wedges between the segmented iron cores, and oil is sprayed onto the iron cores through oil spray holes on the slot wedges. However, during the assembly and fixing of the two housings, it is very easy to block the oil holes connecting to the slot wedges, resulting in blocked oil passages.

[0044] In order to solve the above problems, this application improves the stator assembly 100 of the disc motor 1000. The stator assembly 100 will be described in detail below with reference to the accompanying drawings.

[0045] Please see Figures 1 to 4 The stator assembly 100 includes an intermediate outer shell 1 and an annular sealing plate 2. The intermediate outer shell 1 is arranged around the outer periphery of the core structure 6. The annular sealing plate 2 is arranged around the outer periphery of the intermediate outer shell 1. A liquid cooling channel 3 is formed between the annular sealing plate 2 and the intermediate outer shell 1. The annular sealing plate 2 is provided with a liquid inlet 21 that communicates with the liquid cooling channel 3. The inner wall of the intermediate outer shell 1 is provided with a liquid outlet 11 along its radial direction F1. The liquid outlet 11 is used to communicate with the liquid cooling channel 61 in the core structure 6.

[0046] In the intermediate outer shell 1, the liquid outlet 11 and the liquid cooling channel 3 are offset along the axial direction F2. The inner wall of the liquid cooling channel 3 is provided with a connecting hole 12 at a local position corresponding to the intermediate outer shell 1. The connecting hole 12 extends along the axial direction F2 of the intermediate outer shell 1 to connect the liquid cooling channel 3 and the liquid outlet 11.

[0047] The stator assembly 100 provided by this utility model includes a nested intermediate outer shell 1 and an annular sealing plate 2. The intermediate outer shell 1 is arranged around the outer periphery of the iron core structure 6, and a liquid cooling flow path 61 for cooling the winding structure 7 is formed inside the iron core structure 6. A liquid cooling channel 3 is formed between the annular sealing plate 2 and the intermediate outer shell 1, and the annular sealing plate 2 is provided with an inlet 21 communicating with the liquid cooling flow path 3. The inner wall of the intermediate outer shell 1 is provided with an outlet hole 11 communicating with the liquid cooling flow path 61.

[0048] By providing a connecting hole 12 on the inner wall of the liquid cooling channel 3, the liquid cooling channel 3 and the liquid outlet hole 11 are connected by the connecting hole 12. The liquid cooling medium in the liquid cooling channel 3 first flows along the axial direction F2 of the intermediate outer shell 1 to the connecting hole 12, and then flows through the liquid outlet hole 11 to the liquid cooling flow path 61 in the iron core structure 6. In this way, during the assembly of the intermediate outer shell 1 and the annular sealing plate 2, the connection between the connecting hole 12 and the liquid outlet hole 11 will not be affected, thereby ensuring the connection between the liquid cooling channel 3 and the liquid cooling flow path 61.

[0049] The stator assembly 100 also includes a core structure 6 and a winding structure 7. The winding structure 7 is mounted on the core structure 6, and a liquid cooling flow path 61 is formed inside the core structure 6 for liquid cooling of the winding structure 7. The intermediate outer shell 1 and the annular sealing plate 2 are arranged around the periphery of the core structure 6, and the liquid outlet 11 of the intermediate outer shell 1 is connected to the liquid cooling flow path 61.

[0050] In other words, a liquid cooling channel 3 is formed between the annular sealing plate 2 and the intermediate outer shell 1, and the annular sealing plate 2 is provided with an inlet 21 that connects to the liquid cooling channel 3. The inner wall of the intermediate outer shell 1 is provided with an outlet hole 11 that connects to the liquid cooling path 61. By providing a connecting hole 12 on the inner wall of the liquid cooling channel 3, the liquid cooling channel 3 and the outlet hole 11 are connected. The liquid cooling medium in the liquid cooling channel 3 first flows along the axial direction F2 of the intermediate outer shell 1 to the connecting hole 12, and then flows through the outlet hole 11 to the liquid cooling path 61 in the core structure 6. In this way, during the assembly of the intermediate outer shell 1 and the annular sealing plate 2, the connection between the connecting hole 12 and the outlet hole 11 will not be affected, thereby ensuring the connection between the liquid cooling channel 3 and the liquid cooling path 61.

[0051] Furthermore, the core structure 6 includes multiple teeth 62 spaced F3 apart along the circumference of the intermediate outer shell 1. A slotted wedge 63 is inserted between adjacent teeth 62, with one end of the slotted wedge 63 abutting against the intermediate outer shell 1. Each slotted wedge 63 forms a liquid cooling flow path 61, and the end of the slotted wedge 63 abutting against the intermediate outer shell 1 has an inlet 631 connecting to the liquid cooling flow path 61. The slotted wedge 63 corresponds to the liquid outlet hole 11, so that when the slotted wedge 63 abuts against the inner wall of the intermediate outer shell 1, the inlet 631 communicates with the liquid outlet hole 11. The diameter of the liquid outlet hole 11 is larger than the diameter of the inlet 631.

[0052] In one embodiment, please refer to Figures 5 to 7 An annular groove 31 is formed on the side surface of the intermediate outer shell 1 facing the annular sealing plate 2 along its circumferential direction F3. The annular sealing plate 2 covers the opening of the annular groove 31 to jointly enclose and form a liquid cooling channel 3. The liquid outlet 11 is provided on the inner wall of the intermediate outer shell 1 and is offset from the annular groove 31 in the axial direction F2 of the intermediate outer shell 1. The connecting hole 12 is provided on the groove wall of the annular groove 31 and connects the annular groove 31 and the liquid outlet 11.

[0053] In this embodiment, an annular groove 31 is provided on the intermediate outer shell 1, and an annular sealing plate 2 covers the opening of the annular groove 31 to jointly enclose and form the liquid cooling channel 3. A liquid outlet hole 11 is opened on the inner wall of the intermediate outer shell 1, and a connecting hole 12 is opened on the groove wall of the annular groove 31 near its bottom. During the assembly of the intermediate outer shell 1 and the annular sealing plate 2, the connection position of the intermediate outer shell 1 and the annular sealing plate 2 is set close to the opening of the annular groove 31. By setting the connecting hole 12 on the groove wall of the annular groove 31, the assembly of the intermediate outer shell 1 and the annular sealing plate 2 will not affect the connection between the connecting hole 12 and the liquid outlet hole 11, thereby ensuring the connection between the liquid cooling channel 3 and the liquid cooling flow path 61.

[0054] Meanwhile, the slot wedge 63 is also provided with a spray hole 632 that connects to the liquid cooling flow path 61. The spray hole 632 is set towards the winding structure 7 of the stator assembly 100. The liquid cooling medium in the liquid cooling flow path 3 first flows along the axial direction F2 of the intermediate outer shell 1 to the connecting hole 12, and then flows through the liquid outlet hole 11 and the inlet 631 to the liquid cooling flow path 61 in the core structure 6 in sequence, and is sprayed out from the spray hole 632 to liquid cool the winding structure 7.

[0055] This application does not impose specific restrictions on the location of the connecting hole 12 and the liquid outlet hole 11.

[0056] Please see Figures 5 to 7 In the first embodiment of this utility model, the connecting hole 12 is provided on the side wall of the annular groove 31. Along the radial direction F1 of the intermediate outer shell 1, and on the side near the annular sealing plate 2, the hole wall of the connecting hole 12 penetrates the intermediate outer shell 1. Along the radial direction F1 of the intermediate outer shell 1, and on the side away from the annular sealing plate 2, the hole wall of the connecting hole 12 is flush with the bottom of the annular groove 31.

[0057] It is understandable that the connecting hole 12 is located on the wall of the annular groove 31 and connects to the liquid outlet hole 11. In order to facilitate the processing of the connecting hole 12, the connecting hole 12 is set to penetrate the intermediate outer shell 1. In this way, during processing, a hole can be punched from one end face of the intermediate outer shell 1 toward the annular sealing plate 2, which is convenient for processing and forming.

[0058] Meanwhile, the wall of the connecting hole 12 is flush with the bottom of the annular groove 31, which makes it easier for the liquid cooling medium in the annular groove 31 to flow to the connecting hole 12.

[0059] In this embodiment, the liquid outlet 11 extends through the intermediate outer shell 1 radially F1 and on the side near the annular sealing plate 2. To facilitate the processing of the liquid outlet 11, the liquid outlet 11 is usually opened at the position corresponding to the periphery of the annular groove 31 on the intermediate outer shell 1.

[0060] Please see Figures 8 to 10 In the second embodiment of this utility model, the connecting hole 12 is provided at the bottom of the annular groove 31, and one end of the connecting hole 12 extends toward the side wall of the adjacent annular groove 31 and penetrates the intermediate outer shell 1 in part.

[0061] Meanwhile, on one side of the corresponding connecting hole 12, a groove 14 is formed on the end face 13 of the intermediate outer shell 1. The groove 14 extends radially F1 along the intermediate outer shell 1 so that the groove wall on the side closest to the inner wall of the intermediate outer shell 1 penetrates the intermediate outer shell 1, and its bottom covers the connecting hole 12. A through hole 15 is formed at the bottom of the groove 14 at the position corresponding to the connecting hole 12, and the through hole 15 is connected to the connecting hole 12.

[0062] The stator assembly 100 also includes an outer ring cover plate 5, which is disposed on the end face 13 and covers the groove 14 to seal the groove opening of the groove 14 in the axial direction F2 of the intermediate outer shell 1 and to form a liquid outlet hole 11 on the inner wall of the intermediate outer shell 1.

[0063] The difference from the first embodiment is that, in the second embodiment, the connecting hole 12 is disposed at the bottom of the annular groove 31, and the connecting hole 12 penetrates a portion of the intermediate outer shell 1. One end of the liquid outlet hole 11 extends radially F1 along the intermediate outer shell 1 and terminates at the connecting hole 12. The liquid outlet hole 11 and the connecting hole 12 form a "□" shaped channel.

[0064] Simultaneously, on one side corresponding to the connecting hole 12, a groove 14 is milled into the end face 13 of the intermediate outer shell 1. The side wall of the groove 14 near the inner wall of the intermediate outer shell 1 penetrates the intermediate outer shell 1, thus forming a notch on the inner wall of the intermediate outer shell 1. A through hole 15 is opened at the bottom of the groove 14 at the position corresponding to the connecting hole 12 to connect with the connecting hole 12 in the annular groove 31, thereby forming a connected channel. In this way, the groove can be milled and the hole opened from the end face 13 of the intermediate outer shell 1, which facilitates processing and shaping.

[0065] Furthermore, an outer ring cover plate 5 is provided on the end face 13 to seal the groove of the groove 14 in the axial direction F2 of the intermediate outer shell 1, which not only prevents oil leakage in the axial direction F2 of the intermediate outer shell 1, but also makes the notch on the inner wall of the intermediate outer shell 1 form a liquid outlet hole 11.

[0066] Continuing from the previous statement, "One end of the groove wedge 63 abuts against the intermediate outer shell 1, and when the groove wedge 63 abuts against the inner wall of the intermediate outer shell 1, its inlet 631 communicates with the liquid outlet 11." The inner wall of the outer ring cover plate 5 is set beyond the inner wall of the intermediate outer shell 1 along the radial direction F1, so that the outer ring cover plate 5 presses against the groove wedge 63 locally, thereby limiting the groove wedge 63 in the axial direction F2 of the intermediate outer shell 1.

[0067] This application does not impose specific limitations on the processing method of the intermediate outer shell 1 and the annular sealing plate 2. The intermediate outer shell 1 and the annular sealing plate 2 are usually fixed by welding. Preferably, the intermediate outer shell 1 and the annular sealing plate 2 are fixed by friction stir welding, that is, the connection between the intermediate outer shell 1 and the annular sealing plate 2 is achieved after the material reaches a plastic state by frictional heat and mechanical stirring.

[0068] In one embodiment, please refer to Figure 11 In addition to the stator assembly 100, the disc motor also includes two rotor assemblies (not shown in the figure) and two end covers 200. The two rotor assemblies are respectively located on both sides of the stator assembly 100 along its axial direction F2, and the two end covers 200 are respectively located on both sides of the stator assembly 100 along its axial direction F2 and are respectively connected to the stator assembly 100.

[0069] To ensure reliable installation of the two end caps 200 and the stator assembly 100, in one embodiment, please refer to... Figure 4 The two end faces of the intermediate outer shell 1 along its axial direction F2 are flush with the two end faces of the annular sealing plate 2 to form a flat mounting surface 4; in this way, it can be ensured that the end face of the end cover 200 and the stator assembly 100 are tightly fitted, thereby improving the installation reliability.

[0070] Furthermore, in order to facilitate the installation and fixing of the intermediate outer shell 1 and the annular sealing plate 2, in one embodiment, the stator assembly 100 further includes a guide structure (not shown in the figure). The guide structure includes a guide part and a mating part that are inserted and engaged. One of the guide part and the mating part is provided in the intermediate outer shell 1, and the other is correspondingly provided in the annular sealing plate 2.

[0071] Specifically, the guide structure also includes a plug and a socket that fit together, one of which is located in the intermediate outer shell 1 and the other in the annular sealing plate 2; wherein, one of the plug and the socket is set as a guide part and the other is set as a mating part.

[0072] In this embodiment, by setting pins and holes, not only can they play a guiding role in the assembly process of the intermediate outer shell 1 and the annular sealing plate 2, but they can also limit the intermediate outer shell 1 and the annular sealing plate 2 during the welding process, thus ensuring the reliability of the assembly connection.

[0073] This utility model also provides a disc motor 1000, please refer to [link / reference]. Figure 11 The disc motor 1000 includes a stator assembly 100, two rotor assemblies, and two end covers 200. The two rotor assemblies are respectively located on both sides of the stator assembly 100 along its axial direction F2, and the two end covers 200 are respectively located on both sides of the stator assembly 100 along its axial direction F2 and respectively dock with the stator assembly 100.

[0074] It should be noted that the stator assembly 100 is configured as described above, which includes all the technical features of the stator assembly 100. Therefore, the disc motor 1000 also includes all the technical features of the stator assembly 100, and thus has the technical effects brought about by all the technical features described above.

[0075] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A stator assembly, characterized in that, include: The middle outer shell is arranged around the outer periphery of the iron core structure; as well as, An annular sealing plate is arranged around the outer periphery of the intermediate outer shell. A liquid cooling channel is formed between the annular sealing plate and the intermediate outer shell. The annular sealing plate is provided with an inlet that communicates with the liquid cooling channel. The inner wall of the intermediate outer shell is provided with an outlet hole along its radial direction. The outlet hole is used to communicate with the liquid cooling channel in the iron core structure. In the intermediate outer shell, the liquid outlet is offset from the liquid cooling channel along the axial direction, and the inner wall of the liquid cooling channel is provided with a connecting hole at a local position corresponding to the intermediate outer shell. The connecting hole extends along the axial direction of the intermediate outer shell and connects the liquid cooling channel and the liquid outlet.

2. The stator assembly according to claim 1, characterized in that, The intermediate outer shell has an annular groove on one side of its surface facing the annular sealing plate. The annular sealing plate covers the opening of the annular groove to jointly enclose and form the liquid cooling channel. The liquid outlet is located on the inner wall of the intermediate outer shell and is offset from the annular groove in the axial direction of the intermediate outer shell; The connecting hole is located on the wall of the annular groove and connects the annular groove with the liquid outlet hole.

3. The stator assembly according to claim 2, characterized in that, The connecting hole is located on the side wall of the annular groove; Along the radial direction of the intermediate outer shell and on the side near the annular sealing plate, the wall of the communicating hole penetrates the intermediate outer shell; Along the radial direction of the intermediate outer shell and on the side away from the annular sealing plate, the wall of the connecting hole is flush with the bottom of the annular groove.

4. The stator assembly according to claim 3, characterized in that, The liquid outlet extends through the intermediate outer shell along the radial direction of the intermediate outer shell and on the side near the annular sealing plate.

5. The stator assembly according to claim 2, characterized in that, The connecting hole is located at the bottom of the annular groove, and one end of the connecting hole extends toward the side wall of the annular groove adjacent to it and penetrates part of the intermediate outer shell.

6. The stator assembly according to claim 5, characterized in that, On one side corresponding to the connecting hole, a groove is formed on the end face of the intermediate outer shell. The groove extends radially along the intermediate outer shell so that the groove wall on the side closest to the inner wall of the intermediate outer shell penetrates the intermediate outer shell, and its bottom covers the connecting hole. The bottom of the groove forms a through hole at the position corresponding to the connecting hole, and the through hole communicates with the connecting hole. The stator assembly also includes an outer ring cover plate, which is disposed on the end face and covers the groove to seal the groove opening of the groove in the axial direction of the intermediate outer shell and to form the liquid outlet hole on the inner wall of the intermediate outer shell.

7. The stator assembly according to claim 1, characterized in that, The two end faces of the intermediate outer shell along its axial direction are flush with the two end faces of the annular sealing plate to form a flat mounting surface.

8. The stator assembly according to claim 1, characterized in that, The stator assembly further includes a guide structure, which includes a guide portion and a mating portion that are inserted into each other. One of the guide portion and the mating portion is located in the intermediate outer shell, and the other is located in the annular sealing plate.

9. The stator assembly according to claim 8, characterized in that, The guide structure also includes a plug-in pin and a socket, one of which is located in the intermediate outer shell and the other is located in the annular sealing plate; In this configuration, one of the pin and the socket is configured as the guide portion, and the other is configured as the mating portion.

10. A disc motor, characterized in that, Includes the stator assembly as described in any one of claims 1-9.

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