Iron core structure, stator assembly and disc motor
By using an integrally molded fixing frame of insulating material in a disc motor without a yoke stator, the problems of difficult splicing of segmented teeth and difficulty in unwinding coils are solved, achieving stable connection and efficient assembly of the core structure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG PANGOOD POWER TECH CO LTD
- Filing Date
- 2025-06-17
- Publication Date
- 2026-06-26
AI Technical Summary
In disc motors without a yoke stator, it is difficult to assemble the segmented teeth into blocks, and it is difficult to lay the coil windings. The assembly process is complex and inefficient.
An insulating material is used to integrally form a fixing frame on multiple iron cores. The fixing frame includes a base plate and a sleeve, which realizes the splicing and forming of segmented teeth. The coil is then placed on the sleeve to simplify the coil winding process.
It achieves the splicing and forming of segmented teeth, reducing the difficulty of coil assembly and improving assembly efficiency.
Smart Images
Figure CN224418514U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor equipment technology, and in particular to a core structure, stator assembly and disc motor. Background Technology
[0002] Disc motors have high torque density and broad application prospects. In disc motors without a yoke stator, the stator assembly generally includes positioning columns, a stator core, and concentrated windings mounted on the stator core. Currently, the yokeless core is designed in sections, making it difficult to assemble the segmented teeth into complete units. Furthermore, in disc motors, the coil windings are typically made of flat copper wire, making it difficult to unwind the coils when mounting them onto the segmented teeth. Therefore, the segmented yokeless core suffers from complex assembly processes and low assembly efficiency. Utility Model Content
[0003] The main purpose of this utility model is to propose a core structure, stator assembly and disc motor, which can not only realize the splicing and forming of segmented teeth, but also facilitate the assembly of coil windings.
[0004] To achieve the above objectives, this utility model proposes a core structure for use in the stator assembly of a disc motor, comprising two core units arranged axially opposite to each other in the disc motor, wherein each core unit includes:
[0005] Multiple iron cores are arranged at circumferential intervals along the disc motor. Each iron core includes pole shoes and teeth for fixing coils, the teeth protruding from one side of the pole shoes; and...
[0006] A fixing frame is integrally formed on multiple iron cores. The fixing frame includes a base plate and multiple sleeves protruding from one side of the base plate. The base plate covers multiple pole shoes, and the sleeves cover the outer periphery of the teeth. The fixing frame is made of insulating material.
[0007] In this configuration, the teeth of two core units are in contact with each other.
[0008] Preferably, the core unit further includes an insulating film, which covers the outer wall of the core;
[0009] The mounting bracket covers the periphery of the insulating film.
[0010] Preferably, the base plate covers the peripheral side surface of the pole shoe and the surface connecting the teeth, and on the side away from the teeth, the surface of the base plate is flush with the surface of the pole shoe.
[0011] Preferably, a first groove is provided on the side surface of the pole shoe opposite to the teeth, and in the radial direction of the disc motor, the two opposing inner walls of the first groove penetrate the pole shoe;
[0012] The bottom plate has a first rib formed at the position corresponding to the first groove, and the first rib is held in place within the first groove.
[0013] Preferably, the width of the first groove body narrows from its bottom to its opening.
[0014] The first rib is adapted to the shape of the first groove.
[0015] Preferably, the tooth is provided with a second groove away from the tooth surface of the pole shoe, and when the teeth of the two core units are in contact with each other, the two second groove openings on the two teeth are opposite each other to form a slot together;
[0016] The core unit also includes a pin, which is inserted into the slot and is adapted to the shape of the slot.
[0017] Preferably, in the radial direction of the disc motor, the two opposing inner walls of the second groove penetrate the teeth, and the groove width of the second groove is narrowed from its bottom to its opening.
[0018] Preferably, the end face of the sleeve is flush with the tooth surface of the toothed part, or the end face of the sleeve is lower than the tooth surface of the toothed part.
[0019] Preferably, a limiting portion is formed on the sleeve, and the limiting portion is disposed near the tooth surface of the tooth;
[0020] The core unit also includes multiple annular retaining plates, each annular retaining plate being sleeved around one of the teeth and being limited in place with the limiting part. A coil groove for accommodating the coil is formed between the annular retaining plate and the base plate.
[0021] Preferably, the end face of the sleeve is flush with the tooth surface of the toothed part;
[0022] The limiting part includes two slots provided on the sleeve. The two slots are respectively provided on the two side walls of the sleeve in the radial direction of the disc motor and are located close to the tooth surface of the tooth.
[0023] The annular retaining plate is sleeved around the sleeve and held in the two retaining slots.
[0024] Preferably, the end face of the sleeve is lower than the tooth surface of the tooth portion;
[0025] The annular retaining plate is sleeved on the outer periphery of the tooth and abuts against the end face of the sleeve;
[0026] The limiting part includes a stepped surface formed between the end face of the sleeve and the side wall of the tooth.
[0027] Preferably, the core unit further includes a lead wire connector, which is disposed on the base plate and is used to connect to the lead wire end of the coil.
[0028] This utility model also provides a stator assembly, including:
[0029] Inner shell;
[0030] The outer shell is fitted around the outer periphery of the inner shell;
[0031] The aforementioned core structure is disposed between the inner shell and the outer shell; and,
[0032] The coil is sleeved on the outer periphery of multiple sleeves of the iron core structure.
[0033] This utility model also provides a disc motor, including the stator assembly described above.
[0034] The technical solution provided by this utility model has at least the following advantages:
[0035] The core structure provided by this utility model includes two core units arranged opposite each other. Each core unit includes multiple cores and a fixing frame. The multiple cores are arranged at intervals along the circumference of the disc motor, and the teeth of the cores of the two core units are in contact with each other. The fixing frame is integrally formed on the multiple cores. The base plate of the fixing frame covers multiple pole shoes, and the sleeve of the fixing frame covers the outer periphery of the teeth. That is, the fixing frame is integrally formed on the multiple cores using insulating material. The fixing frame forms a structure similar to the yoke of the core, which is used to fix and connect the multiple segmented cores, thereby realizing the splicing and forming of the segmented teeth. At the same time, after the fixing frame fixes and connects the multiple cores, the coil can be placed on the sleeve, which facilitates the winding and reduces the assembly difficulty of the coil, thereby improving the assembly efficiency. Attached Figure Description
[0036] 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.
[0037] Figure 1A schematic diagram of an embodiment of an iron core structure (injection molded part) provided by this utility model;
[0038] Figure 2 for Figure 1 The schematic diagram of the core structure with respect to the core arrangement is shown below.
[0039] Figure 3 for Figure 1 Top view of the core structure;
[0040] Figure 4 for Figure 3 The core structure is shown in the first sectional view along AA.
[0041] Figure 5 for Figure 3 The core structure is viewed along the second cross-sectional view of AA;
[0042] Figure 6 for Figure 1 A schematic diagram of the core structure with respect to the teeth;
[0043] Figure 7 for Figure 6 A cross-sectional view of the teeth along BB;
[0044] Figure 8 for Figure 1 A plan view of the toothed joint of the iron core structure;
[0045] Figure 9 A schematic diagram of a stator assembly according to an embodiment of the present invention;
[0046] Figure 10 for Figure 9 A cross-sectional view of the stator assembly along CC.
[0047] Explanation of icon numbers:
[0048] 1000 Stator assembly; 100 Core structure; 1 Core unit; 11 Core; 111 Pole shoe; 112 Tooth; 113 First slot; 114 Second slot; 12 Fixing frame; 121 Base plate; 122 Sleeve; 123 First rib; 13 Insulating film; 14 Pin; 15 Limiting part; 151 Slot; 152 Stepped surface; 16 Annular retaining plate; 17 Pressure plate; 18 Outlet connector; 200 Coil; 300 Inner shell; 400 Outer shell; F1 Circumferential; F2 Radial; F3 Axial.
[0049] 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
[0050] 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.
[0051] 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.
[0052] 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.
[0053] In disc motors without a yoke stator, the stator assembly typically includes positioning columns, a stator core, and concentrated windings mounted on the stator core. Current yokeless cores are designed in sections, making it difficult to assemble the segmented teeth into complete units. Furthermore, in disc motors, the coil windings are usually made of flat copper wire, making it difficult to unwind the coils when mounting them onto the segmented teeth. Therefore, the segmented yokeless core design suffers from complex assembly processes and low assembly efficiency.
[0054] To address the aforementioned issues, this application improves the structure of the iron core 11. The iron core structure 100 will be described below in conjunction with the accompanying drawings.
[0055] Please see Figure 1 , Figure 2 and Figure 7The core structure 100 is applied to the stator assembly 1000 of the disc motor. The core structure 100 includes two core units 1 arranged opposite each other in the axial direction F3 of the disc motor. The core unit 1 includes multiple cores 11 and a fixing frame 12. The multiple cores 11 are arranged at intervals along the circumferential direction F1 of the disc motor. The core 11 includes pole shoes 111 and teeth 112 for fixing coils 200. The teeth 112 protrude from one side of the pole shoes 111. The fixing frame 12 is integrally formed on the multiple cores 11. The fixing frame 12 includes a base plate 121 and multiple sleeves 122 protruding from one side of the base plate 121. The base plate 121 covers the multiple pole shoes 111. The sleeves 122 cover the outer periphery of the teeth 112. The fixing frame 12 is made of insulating material. The teeth 112 of the two core units 1 are in contact with each other.
[0056] The iron core structure 100 provided by this utility model includes two iron core units 1 arranged opposite to each other. Each iron core unit 1 includes multiple iron cores 11 and a fixing frame 12. The multiple iron cores 11 are arranged at intervals along the circumferential direction F1 of the disc motor. The teeth 112 of the iron cores 11 of the two iron core units 1 are connected to each other. The fixing frame 12 is integrally formed on the multiple iron cores 11. The base plate 121 of the fixing frame 12 covers multiple pole shoes 111. The sleeve 122 of the fixing frame 12 covers the outer periphery of the teeth 112. That is, the fixing frame 12 is integrally formed on the multiple iron cores 11 using insulating material. The fixing frame 12 forms a structure similar to the yoke of the iron core 11, which is used to fix and connect the multiple segmented iron cores 11, thereby realizing the splicing and forming of the segmented teeth 112. At the same time, after the fixing frame 12 fixes and connects the multiple iron cores 11, the coil 200 can be sleeved on the sleeve 122, which facilitates the winding and reduces the assembly difficulty of the coil 200, thereby improving the assembly efficiency.
[0057] This application does not impose specific restrictions on the material of the fixing frame 12, as long as it is an insulating material with a certain strength. Preferably, the fixing frame 12 is made of plastic; that is, the iron core unit 1 includes multiple iron cores 11 arranged in blocks, and the multiple iron cores 11 are wrapped with injection molding and other processes, thereby injection molding the fixing frame 12 on the multiple iron cores 11, thus forming the plastic-coated iron core unit 1.
[0058] It is understandable that although the fixing frame 12 is made of insulating material, the insulation performance of the insulating material will change during the molding process. In order to further enhance the insulation between the iron core 11 and the coil 200, in one embodiment, the iron core unit 1 further includes an insulating film 13, which covers the outer wall of the tooth portion 112; the sleeve 122 covers the periphery of the insulating film 13.
[0059] In related technologies, insulating paper is typically placed between the iron core 11 and the coil 200 to insulate the iron core 11 from the coil 200. In this embodiment, an insulating film 13 is first wrapped around the outer wall of the iron core 11, and then multiple iron cores 11 are wrapped using processes such as injection molding and potting. That is, insulating material is wrapped around the insulating film 13 to form a fixing frame 12. In this way, not only can the insulation between the iron core 11 and the coil 200 be achieved, but the insulating paper in related technologies can also be eliminated.
[0060] In a single-stator, dual-rotor disc motor, the stator assembly 1000 has two rotors on each side along its axial direction F3, and an air gap is formed between the stator assembly 1000 and the rotors on the corresponding sides. In this application, the stator assembly 1000 includes two iron core units 1 arranged opposite each other along the axial direction F3 of the disc motor, and the teeth 112 of the two iron core units 1 are in contact with each other; that is, the pole shoes 111 of the iron core units 1 are opposite to the rotors, and an air gap is formed between them.
[0061] The base plate 121 covers multiple pole shoes 111. To avoid the base plate 121 occupying the air gap space, in one embodiment, please refer to... Figure 3 and Figure 4 The base plate 121 covers the peripheral side of the pole shoe 111 and the surface of the connecting tooth 112, and on the side away from the tooth 112, the surface of the base plate 121 is flush with the surface of the pole shoe 111.
[0062] In other words, on the side away from the toothed part 112, the pole shoe 111 is exposed, and the surface of the base plate 121 is flush with the surface of the pole shoe 111. In this way, while fixing multiple iron cores 11, the base plate 121 will not occupy the air gap space and will not affect the air gap of the motor, thus ensuring the performance of the motor.
[0063] Meanwhile, in order to improve the stability of the multiple iron cores 11, in one embodiment, please refer to further details. Figure 4 The pole shoe 111 has a first groove 113 on the side surface away from the tooth 112. On the radial direction F2 of the disc motor, the two inner walls of the first groove 113 penetrate the pole shoe 111. The bottom plate 121 has a first rib 123 at the position corresponding to the first groove 113. The first rib 123 is held in the first groove 113.
[0064] Furthermore, taking a dual-rotor single-stator motor as an example, during the motor assembly process, the installation on one side is usually completed first. At this time, the single-side rotor generates a strong magnetic pull on the iron core 11. This magnetic pull will pull the iron core 11, so that it may be at risk of being detached from the fixing frame 12.
[0065] In one embodiment, please refer to Figures 3 to 6The first groove 113 has a narrowing width from its bottom to its opening; the first rib 123 is adapted to the shape of the first groove 113. By setting the first groove 113 to have a narrowing width from its bottom to its opening, and the first rib 123 to be adapted to the shape of the first groove 113, when the tooth 112 is subjected to magnetic pull, the inner wall of the narrowing position of the first groove 113 abuts against the first rib 123, and the magnetic pull is transmitted to the entire fixing frame 12 through the first rib 123, thereby dispersing the magnetic pull; at the same time, the inner wall of the narrowing position of the first groove 113 will exert a certain pressure on the first rib 123, thereby offsetting part of the magnetic pull acting on the iron core 11, and thus preventing the iron core 11 from peeling off from the fixing frame 12.
[0066] Following the previous statement that "the stator assembly 1000 is composed of two core units 1 joined together," during the installation of a single-sided rotor, the single-sided rotor generates a strong magnetic pull on the core 11. To prevent the magnetic pull from causing the two joined core units 1 to separate, in one embodiment, please refer to... Figures 3 to 6 The tooth 112 is provided with a second groove 114 away from the tooth surface of the pole shoe 111. When the teeth 112 of the two iron core units 1 are in contact, the two second grooves 114 on the two teeth 112 are in contact with each other to form a slot. The iron core unit 1 also includes a pin 14, which is inserted into the slot and is adapted to the shape of the slot.
[0067] Preferably, please refer to Figure 7 On the radial direction F2 of the disc motor, the two inner walls of the second groove 114 penetrate the tooth 112, and the groove width of the second groove 114 narrows from its bottom to its opening. That is to say, after the two iron core units 1 are spliced, the openings of the two second grooves 114 on the mating teeth 112 are opposite each other to form a slot; and the groove width of the second groove 114 narrows from its bottom to its opening, that is, the cross section of the slot on the radial direction F2 of the disc motor is hourglass-shaped, and correspondingly, the cross section of the pin 14 on the radial direction F2 of the disc motor is hourglass-shaped.
[0068] When the pin 14 is inserted into the slot, the middle part of the pin 14 is narrower and the two ends are wider. The slot is narrow at the joint position and wider at the bottom of the slot on both sides. In this way, the pin 14 can limit the two teeth 112 on the upper limit of the axial F3 of the disc motor, thereby avoiding the magnetic pull of the rotor on the stator assembly 1000 from separating the two iron core units 1 when the single-sided rotor is installed, thus improving the stability of the iron core structure 100.
[0069] This application does not impose a specific limitation on the height of the sleeve 122, which can be adjusted according to the positioning method during injection molding. In some embodiments, please refer to... Figure 4During injection molding, a separate positioning fixture is used, and the end face of the sleeve 122 is flush with the tooth surface of the tooth 112, that is, the sleeve 122 can be molded onto the tooth surface of the tooth 112; in another embodiment, please refer to Figure 5 During injection molding, the positioning is based on the local position of the tooth 112. The end face of the sleeve 122 is lower than the tooth surface of the tooth 112. That is, the sleeve 122 needs to avoid the position of the tooth 112 that is close to its tooth surface.
[0070] After the coil 200 is installed on the sleeve 122, please refer to [link / reference needed] for positioning the coil 200. Figure 10 In one embodiment, a limiting part 15 is formed on the sleeve 122, and the limiting part 15 is disposed near the tooth surface of the tooth 112; the core unit 1 also includes a plurality of annular clamping plates 16, each annular clamping plate 16 being sleeved around a tooth 112 and being limited and engaged with the limiting part 15, and a coil groove for accommodating the coil 200 is formed between the annular clamping plate 16 and the base plate 121.
[0071] In this embodiment, when the coil 200 is sleeved outside the sleeve 122, the annular retaining plate 16 is sleeved around the toothed portion 112. A coil groove for accommodating the coil 200 is formed between the annular retaining plate 16 and the base plate 121, thereby limiting the coil 200. At the same time, in order to prevent the annular retaining plate 16 from excessively pressing the coil 200, the sleeve 122 is provided with a limiting part 15 near the toothed surface of the toothed portion 112. When the annular retaining plate 16 is sleeved around the toothed portion 112, it will cooperate with the limiting part 15 on the sleeve 122 to limit the position of the annular retaining plate 16 on the axial direction F3 of the disc motor.
[0072] This application does not impose specific restrictions on the structure of the limiting part 15.
[0073] In one embodiment, please refer to Figure 4 The end face of the sleeve 122 is flush with the tooth surface of the toothed part 112; the limiting part 15 includes two slots 151 on the sleeve 122, the two slots 151 are respectively located on the two side walls of the sleeve 122 on the radial direction F2 of the disc motor, and are located close to the tooth surface of the toothed part 112; the annular retaining plate 16 is sleeved on the periphery of the sleeve 122 and is held in the two slots 151.
[0074] In one embodiment, please refer to Figure 5 The end face of the sleeve 122 is lower than the tooth surface of the tooth 112; the annular retaining plate 16 is sleeved on the outer periphery of the tooth 112 and abuts against the end face of the sleeve 122; wherein, the limiting part 15 includes a stepped surface 152 formed between the end face of the sleeve 122 and the side wall of the tooth 112.
[0075] Furthermore, in one embodiment, please refer to Figure 10The core unit 1 also includes a pressure plate 17, which has multiple clearance holes. The pressure plate 17 is located on the side of the annular clamping plate 16 away from the coil 200, and each tooth 112 is accommodated in the clearance hole; wherein the tooth surface of the tooth 112 is flush with the surface of the pressure plate 17.
[0076] In one embodiment, please refer to Figure 1 The core unit 1 also includes a lead wire connector 18, which is located on the base plate 121 and is used to connect to the lead wire end of the coil 200.
[0077] This utility model also provides a stator assembly 1000, please refer to Figures 9 and 1000. Figure 10 The stator assembly 1000 includes a nested outer shell 400 and an inner shell 300, a core structure 100 disposed between the two, and a coil 200.
[0078] It should be noted that the core structure 100 is configured as described above, which includes all the technical features of the core structure 100. Therefore, the stator assembly 1000 also includes all the technical features of the core structure 100, and thus has the technical effects brought about by all the technical features described above.
[0079] The core structure 100 includes two core units 1 arranged opposite to each other. Each core unit 1 includes multiple cores 11 and a fixing frame 12. The multiple cores 11 are arranged at intervals along the circumferential direction F1 of the disc motor. The teeth 112 of the cores 11 of the two core units 1 are connected to each other. The fixing frame 12 is integrally formed on the multiple cores 11. The base plate 121 of the fixing frame 12 covers multiple pole shoes 111. The sleeve 122 of the fixing frame 12 covers the outer periphery of the teeth 112. That is, the fixing frame 12 is integrally formed on the multiple cores 11 using insulating material. The fixing frame 12 forms a structure similar to the yoke of the core 11, which is used to fix and connect the multiple segmented cores 11, thereby realizing the splicing and forming of the segmented teeth 112. At the same time, after the fixing frame 12 fixes and connects the multiple cores 11, the coil 200 can be sleeved on the sleeve 122, which facilitates the winding and reduces the assembly difficulty of the coil 200, thereby improving the assembly efficiency.
[0080] This utility model also provides a disc motor, which includes a stator assembly 1000 and two rotors disposed on both sides of its axial direction F3.
[0081] It should be noted that the stator assembly 1000 is configured as described above, which includes all the technical features of the stator assembly 1000. Therefore, the disc motor also includes all the technical features of the stator assembly 1000 and thus has the technical effects brought about by all the technical features described above.
[0082] 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 core structure used in the stator assembly of a disc motor, characterized in that, The disc motor includes two core units arranged axially opposite each other, each core unit comprising: Multiple iron cores are arranged at circumferential intervals along the disc motor. Each iron core includes pole shoes and teeth for fixing coils, the teeth protruding from one side of the pole shoes; and... A fixing frame is integrally formed on multiple iron cores. The fixing frame includes a base plate and multiple sleeves protruding from one side of the base plate. The base plate covers multiple pole shoes, and the sleeves cover the outer periphery of the teeth. The fixing frame is made of insulating material. In this configuration, the teeth of two core units are in contact with each other.
2. The core structure according to claim 1, characterized in that, The core unit also includes an insulating film, which covers the outer wall of the core; The mounting bracket covers the periphery of the insulating film.
3. The core structure according to claim 1, characterized in that, The base plate covers the peripheral side surface of the pole shoe and the surface connecting the teeth, and on the side away from the teeth, the surface of the base plate is flush with the surface of the pole shoe.
4. The core structure according to claim 3, characterized in that, The pole shoe has a first groove on the side surface opposite to the teeth, and in the radial direction of the disc motor, the two opposing inner walls of the first groove penetrate the pole shoe. The bottom plate has a first rib formed at the position corresponding to the first groove, and the first rib is held in place within the first groove.
5. The core structure according to claim 4, characterized in that, The width of the first groove body narrows from its bottom to its opening. The first rib is adapted to the shape of the first groove.
6. The core structure according to claim 1, characterized in that, The toothed part is provided with a second groove on the toothed surface away from the pole shoe, and when the teeth of the two core units are in contact with each other, the two second groove openings on the two teeth are in contact with each other to form a slot together. The core unit also includes a pin, which is inserted into the slot and is adapted to the shape of the slot.
7. The core structure according to claim 6, characterized in that, In the radial direction of the disc motor, the two opposing inner walls of the second groove penetrate the teeth, and the groove width of the second groove is narrowed from its bottom to its opening.
8. The core structure according to claim 1, characterized in that, The end face of the sleeve is flush with the tooth surface of the tooth, or the end face of the sleeve is lower than the tooth surface of the tooth.
9. The core structure according to claim 1, characterized in that, A limiting portion is formed on the sleeve, and the limiting portion is disposed near the tooth surface of the tooth portion; The core unit also includes multiple annular retaining plates, each annular retaining plate being sleeved around one of the teeth and being limited in place with the limiting part. A coil groove for accommodating the coil is formed between the annular retaining plate and the base plate.
10. The core structure according to claim 9, characterized in that, The end face of the sleeve is flush with the tooth surface of the toothed part; The limiting part includes two slots provided on the sleeve. The two slots are respectively provided on the two side walls of the sleeve in the radial direction of the disc motor and are located close to the tooth surface of the tooth. The annular retaining plate is sleeved around the sleeve and held in the two retaining slots.
11. The core structure according to claim 9, characterized in that, The end face of the sleeve is lower than the tooth surface of the tooth; The annular retaining plate is sleeved on the outer periphery of the tooth and abuts against the end face of the sleeve; The limiting part includes a stepped surface formed between the end face of the sleeve and the side wall of the tooth.
12. The core structure according to claim 1, characterized in that, The core unit also includes a lead wire connector, which is located on the base plate and is used to connect to the lead wire end of the coil.
13. A stator assembly, characterized in that, include: Inner shell; The outer shell is fitted around the outer periphery of the inner shell; The core structure as described in claims 1-12, wherein the core structure is disposed between the inner shell and the outer shell; and, The coil is sleeved on the outer periphery of multiple sleeves of the iron core structure.
14. A disc motor, characterized in that, Includes the stator assembly as described in any one of claims 1-13.