Iron core structure

Abstract

This utility model discloses an iron core structure, which is disposed between nested outer shell and inner shell. The iron core structure includes a plurality of teeth spaced apart along the circumference of the outer shell. In the axial direction of the outer shell, at least one tooth surface of the teeth has an auxiliary groove. In the radial direction of the outer shell, the two side walls of the auxiliary groove penetrate the teeth. The iron core structure also includes a plurality of separately arranged positioning structures, each positioning structure corresponding to one tooth. The positioning structure includes a radial limiting part and at least one axial limiting post. The radial limiting part is located at least between the teeth and the outer shell to limit the teeth in the radial direction of the outer shell. The axial limiting post is correspondingly inserted through the auxiliary groove. The two ends of the axial limiting post are respectively connected to the outer shell and the inner shell. The axial limiting post is arranged with a uniform cross section in the radial direction of the outer shell.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to an iron core structure. 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 posts, a stator core, and concentrated windings mounted on the stator core. The positioning posts are located in auxiliary slots on the tooth surface of the stator core to fix the stator core in the upper limit axially and radially. Positioning posts are usually I-shaped, meaning that the complete positioning post needs to be cut. Because the positioning posts are made of interwoven fiberglass, cutting them is quite difficult. Furthermore, after the positioning post undergoes a pre-forming and then cutting process, the interwoven fiberglass in the narrower central section is cut off, thus affecting the strength of the positioning post. Utility Model Content

[0003] The main purpose of this invention is to propose a core structure that, while achieving fixation of the teeth, not only simplifies the manufacturing process of the axial limiting post but also improves its strength and stability.

[0004] To achieve the above objectives, this utility model proposes a core structure disposed between nested outer and inner shells. The core structure includes a plurality of teeth spaced apart along the circumference of the outer shell. In the axial direction of the outer shell, at least one tooth surface of the teeth has an auxiliary groove. In the radial direction of the outer shell, the two side walls of the auxiliary groove penetrate the teeth.

[0005] The core structure further includes multiple separately arranged positioning structures, each positioning structure corresponding to one of the core teeth, and the positioning structure includes:

[0006] A radial limiting portion, at least located between the teeth and the outer casing, to radially limit the teeth within the outer casing; and

[0007] At least one axial limiting post is provided, which is correspondingly inserted through the auxiliary groove. The two ends of the axial limiting post are respectively connected to the outer shell and the inner shell. The axial limiting post is arranged with a uniform cross section in the radial direction of the outer shell.

[0008] Optionally, the angle between the inner wall of the auxiliary groove and its bottom wall in the circumferential direction of the outer casing is not less than 90°.

[0009] Optionally, in the axial direction of the outer casing, the radial limiting portion is disposed on the same side as the axial limiting post. The radial limiting portion includes an outer ring limiting portion, which is located at least on one side of the axial limiting post in the circumferential direction of the outer casing and is spaced apart from the axial limiting post. The outer ring limiting portion abuts against the toothed portion and the outer casing.

[0010] Optionally, the outer ring limiting part includes two limiting blocks, which are respectively disposed on both sides of the corresponding axial limiting post in the circumferential direction of the outer shell. The two limiting blocks are spaced apart from the axial limiting post, and each limiting block abuts against the tooth and the outer shell.

[0011] Optionally, the limiting block is arranged with a uniform cross-section in the radial direction of the outer shell, and the cross-section of the limiting block is the same as the cross-section of the axial limiting post.

[0012] Optionally, the radial limiting portion further includes an inner ring limiting portion, which is disposed on the inner housing and abuts against the toothed portion;

[0013] The two ends of the axial limiting post are respectively connected to the outer shell and the inner ring limiting part.

[0014] Optionally, the inner ring limiting part includes an inner ring end plate, which is disposed on one side of the inner housing in its axial direction. The side wall of the inner ring end plate has a plurality of protrusions protruding in its circumferential direction, and each of the protrusions abuts against one of the teeth.

[0015] One end of the axial limiting post abuts against the outer shell, and the other end is connected to the protrusion.

[0016] Optionally, the axial limiting post is integrally formed with the protrusion; and / or,

[0017] In the axial direction of the outer casing, the height of the inner ring end plate does not exceed the height of the teeth.

[0018] Optionally, the auxiliary groove is formed on both of the opposing tooth surfaces;

[0019] Correspondingly, the positioning structure includes two axial limiting posts, each of which is inserted into one of the auxiliary grooves;

[0020] Correspondingly, two radial limiting parts are provided, and each radial limiting part corresponds to one axial limiting post.

[0021] Optionally, the outer shell is provided with a plurality of clearance portions on one end face corresponding to the axial limiting post. The plurality of clearance portions are arranged at intervals along the circumference of the outer shell and correspond to the plurality of teeth. The clearance portion includes a first notch, which corresponds to the auxiliary groove, so that when the axial limiting post passes through the auxiliary groove, one end of it can be accommodated in the first notch.

[0022] The core structure also includes an outer ring cover plate, which is disposed on the end face and covers multiple of the first notches.

[0023] Optionally, the radial limiting portion includes an outer ring limiting portion, which limits the tooth portion and the outer shell;

[0024] The clearance portion further includes a plurality of second notches, each second notch corresponding to one of the outer ring limiting portions, for one end of the outer ring limiting portion to be inserted;

[0025] The outer ring cover plate covers multiple second notches.

[0026] The technical solution provided by this utility model has at least the following advantages:

[0027] The core structure provided by this utility model includes multiple teeth spaced apart along the circumference of the outer shell, arranged radially. At least one tooth surface of each tooth has an auxiliary groove, which penetrates both sides of the outer shell in the radial direction. By providing the auxiliary groove, the waveform of the air gap magnetic field of the motor can be adjusted, reducing harmonic components in the magnetic field. Furthermore, the distribution of the air gap magnetic field is made more uniform, improving the electromagnetic performance of the motor and increasing the magnetic reluctance of the magnetic circuit, thereby regulating the magnetic flux of the motor. Simultaneously, an axial limiting post is provided, passing through the auxiliary groove. The two ends of the axial limiting post are respectively connected to the outer shell and the inner shell, thereby limiting the teeth in the axial direction of the outer shell. A radial limiting part further limits the teeth in the radial direction of the outer shell, thus achieving the positioning of the yokeless core. Moreover, by setting the axial limiting post with a uniform cross-section in the radial direction of the outer shell, cutting the axial limiting post is avoided, which not only simplifies the manufacturing process of the axial limiting post but also improves its strength, ensuring the stability of the positioning of the yokeless core. Attached Figure Description

[0028] 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.

[0029] Figure 1A schematic diagram of a stator assembly according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 An exploded view of the stator assembly;

[0031] Figure 3 for Figure 1 A schematic diagram of the stator assembly (without the outer ring cover);

[0032] Figure 4 for Figure 3 The stator assembly is shown in the diagram with respect to the teeth and axial limiting post.

[0033] Figure 5 for Figure 3 An enlarged schematic diagram of part A of the stator assembly;

[0034] Figure 6 for Figure 5 A schematic diagram of the stator assembly (excluding the axial limiting post and limiting block);

[0035] Figure 7 for Figure 1 A cross-sectional view of the stator assembly along BB.

[0036] Explanation of icon numbers:

[0037] 1000 Stator assembly; 100 Core structure; 1 Tooth section; 11 Tooth surface; 12 Auxiliary groove; 13 Slot; 2 Positioning structure; 21 Radial limiting part; 211 Outer ring limiting part; 2111 Limiting block; 212 Inner ring limiting part; 2121 Inner ring end plate; 2122 Protrusion; 22 Axial limiting post; 3 Outer ring cover plate; 200 Outer shell; 201 First notch; 202 Second notch; 300 Inner shell; 400 Slot wedge; F1 Axial; F2 Radial; F3 Circumferential.

[0038] 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

[0039] 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.

[0040] 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.

[0041] 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.

[0042] In disc motors without a yoke stator, the fixation of the iron core has a significant impact on the stability of motor performance. Some technologies utilize a fixing disc to install and support the iron core; however, the thickness of the fixing disc increases the air gap, negatively affecting not only the permanent magnet but also the accuracy of the air gap dimensions. Other technologies use I-shaped positioning posts based on auxiliary slots on the iron core teeth to fix the core. While this solves the air gap issue and ensures motor performance, the positioning posts are made of interwoven fiberglass, increasing manufacturing difficulty and potentially damaging the internal fiber structure, thus affecting the post's strength.

[0043] To address the aforementioned issues, this application improves the core structure of the stator assembly 1000. The core structure 100 will be described below in conjunction with the accompanying drawings.

[0044] Please see Figures 1 to 4The stator assembly 1000 includes a nested outer shell 200 and an inner shell 300, and a core structure 100 disposed between the two. The core structure 100 includes a plurality of teeth 1 spaced apart along the circumferential direction F3 of the outer shell 200. The plurality of teeth 1 are arranged radially. On the circumferential direction F3 of the outer shell 200, slots 13 are provided on two opposite sides of the teeth 1. The slots 13 extend along the radial direction F2 of the outer shell 200. The stator assembly 1000 also includes a plurality of slot wedges 400. Each slot wedge 400 is disposed between two teeth 1 and inserted into two opposite slots 13. The slot wedges 400 can easily fix the plurality of teeth 1.

[0045] Meanwhile, on the axial direction F1 of the outer shell 200, at least one tooth surface 11 of the tooth 1 is provided with an auxiliary groove 12, and the auxiliary groove 12 is provided through both sides of the outer shell 200 on the radial direction F2; the core structure 100 also includes a plurality of separately arranged positioning structures 2, each positioning structure 2 corresponding to one tooth 1. The positioning structure 2 includes a radial limiting part 21 and two axial limiting posts 22. The radial limiting part 21 is located at least between the tooth 1 and the outer shell 200 to limit the tooth 1 on the radial direction F2 of the outer shell 200; the axial limiting posts 22 are respectively provided through the auxiliary groove 12, and the two ends of the axial limiting posts 22 are respectively connected to the outer shell 200 and the inner shell 300. The axial limiting posts 22 are provided with a uniform cross section on the radial direction F2 of the outer shell 200 and are adapted to the shape of the auxiliary groove 12.

[0046] The core structure 100 provided by this utility model includes a plurality of teeth 1 arranged at intervals along the circumferential direction F3 of the outer shell 200, and the plurality of teeth 1 are arranged radially. At least one tooth surface 11 of the tooth 1 has an auxiliary groove 12, which is provided through both side walls in the radial direction F2 of the outer shell 200. By providing the auxiliary groove 12, not only can the waveform of the air gap magnetic field of the motor be adjusted and the harmonic components in the magnetic field be reduced, but the distribution of the air gap magnetic field can also be made more uniform, improving the electromagnetic performance of the motor, and increasing the magnetic reluctance of the magnetic circuit, thereby adjusting the magnetic flux of the motor.

[0047] Simultaneously, an axial limiting post 22 is provided, passing through an auxiliary groove 12. The two ends of the axial limiting post 22 are respectively connected to the outer shell 200 and the inner shell 300, thereby limiting the tooth 1 in the axial direction F1 of the outer shell 200. The tooth 1 is also limited and fixed in the radial direction F2 of the outer shell 200 by the radial limiting part 21, thus achieving the positioning of the yokeless iron core. Furthermore, by setting the axial limiting post 22 with a uniform cross-section in the radial direction F2 of the outer shell 200, cutting the axial limiting post 22 is avoided. This not only simplifies the manufacturing process of the axial limiting post 22 but also improves its strength, ensuring the stability of the positioning of the yokeless iron core.

[0048] It is known that the positioning posts in the relevant technologies use multi-layered interlaced fiberglass rods. These multi-layered interlaced fiberglass rods are made of multiple layers of glass fiber cloth or fiber bundles laid in an interlaced manner at a certain angle and sequence. Although this can give the positioning posts good mechanical properties and strength, it makes the manufacturing process of the positioning posts complicated. Furthermore, the multi-layered interlaced fiberglass rods do not have prominent anisotropy and are brittle, resulting in low overall stability.

[0049] In one embodiment of this application, the axial limiting post 22 is configured as a fiberglass rod, which is made of continuous fiberglass and laid in a single layer. That is, the fiberglass rod uses continuous fiber bundles or fiber cloth, neatly arranged in a single direction to form a single-layer structure. This not only simplifies the manufacture of the axial limiting post 22, but also ensures good fiber continuity in the single-layer fiberglass rod, resulting in higher tensile strength and modulus of the axial limiting post 22 in the fiber laying direction. Furthermore, the fiber laying direction can be adjusted according to the stress on the axial limiting post 22, thereby maximizing its strength.

[0050] For example, in this embodiment, the fiber bundles of the glass fiber rod can be arranged along the radial direction F2 of the outer shell 200. At this time, the modulus and strength of the glass fiber rod reach the maximum, thereby enabling the axial limiting post 22 to have better stability to limit the tooth 1.

[0051] In one embodiment, auxiliary grooves 12 are provided on the two opposing tooth surfaces 11 of the tooth 1. Correspondingly, two axial limiting posts 22 are provided, and each axial limiting post 22 is inserted into one auxiliary groove 12.

[0052] To facilitate the assembly of the axial limiting post 22 and the auxiliary groove 12, in one embodiment, the angle between the inner wall of the auxiliary groove 12 on the circumferential F3 of the outer shell 200 and its bottom wall is not less than 90°; that is, the auxiliary groove 12 is flared, which facilitates the assembly of the axial limiting post 22.

[0053] This application does not impose specific limitations on the cross-sectional shape of the axial limiting post 22; it can be square, trapezoidal, or hemispherical. For manufacturing process considerations, please refer to [link / reference needed]. Figure 4 Preferably, the cross-sections of the auxiliary groove 12 and the axial limiting post 22 are square. Furthermore, the cross-sectional shape of the axial limiting post 22 is adapted to the cross-sectional shape of the auxiliary groove 12.

[0054] In order to prevent the tooth 1 from being displaced along the axial direction F1 of the outer shell 200, and to simultaneously allow the axial limiting post 22 to be inserted into the auxiliary groove 12; in one embodiment, the axial limiting post 22 and the auxiliary groove 12 are in clearance fit, and the gap between the axial limiting post 22 and the auxiliary groove 12 is filled with adhesive.

[0055] Meanwhile, in order to avoid the axial limiting post 22 provided on the tooth 1 from affecting the air gap of the disc motor, in one embodiment, the end face of the axial limiting post 22 is set lower than the slot opening of the auxiliary groove 12 on the axial F1 of the outer casing 200.

[0056] This application does not specifically limit the location of the radial limiting part 21. Preferably, in one embodiment, please refer to... Figure 4 and Figure 5 The radial limiting part 21 is provided corresponding to one of the axial limiting posts 22. The radial limiting part 21 includes an outer ring limiting part 211. The outer ring limiting part 211 is located at least on one side of the corresponding axial limiting post 22 on the circumferential F3 of the outer shell 200, and is spaced apart from the axial limiting post 22. The outer ring limiting part 211 abuts against the toothed part 1 and the outer shell 200.

[0057] In other words, in this embodiment, a groove wedge 400 is provided between two adjacent teeth 1. When the outer ring limiting part 211 abuts against the tooth 1 and the outer shell 200, the groove wedge 400 and the outer ring limiting part 211 generate a relative radial force F2 on the tooth 1, thereby limiting the tooth 1 in the radial direction F2 of the outer shell 200.

[0058] Specifically, please refer to Figure 5 The outer ring limiting part 211 includes two limiting blocks 2111. The two limiting blocks 2111 are respectively disposed on both sides of the corresponding axial limiting post 22 on the circumferential F3 of the outer shell 200. The two limiting blocks 2111 are spaced apart from the axial limiting post 22. Each limiting block 2111 abuts against the tooth part 1 and the outer shell 200.

[0059] Following the above description of "the axial limiting post 22 being configured as a fiberglass rod, with the fiber bundles of the fiberglass rod arranged in a single layer," in order to improve the strength of the limiting block 2111, in one embodiment, the limiting block 2111 is configured as a fiberglass rod, with the fiber bundles of the fiberglass rod arranged in a single layer. Furthermore, to further simplify the manufacturing process, in one embodiment, the limiting block 2111 has a uniform cross-section on the radial direction F2 of the outer shell 200, and the cross-section of the limiting block 2111 is the same as the cross-section of the axial limiting post 22; thus, the shape of the limiting block 2111 is consistent with that of the axial limiting post 22, only differing in length, so the limiting block 2111 and the axial limiting post 22 can be manufactured simultaneously.

[0060] Although the outer ring limiting portion 211 and the groove wedge 400 can jointly limit the tooth portion 1 in the radial direction F2 of the outer casing 200, the stability is poor. In one embodiment, please refer to... Figure 3 The radial limiting part 21 also includes an inner ring limiting part 212, which is disposed on the inner shell 300 and abuts against the tooth part 1; wherein, the two ends of the axial limiting post 22 are respectively connected to the outer shell 200 and the inner ring limiting part 212.

[0061] In this embodiment, in addition to the outer ring limiting part 211 and the groove wedge 400 jointly limiting the tooth part 1, an inner ring limiting part 212 is also provided on the inner shell 300 to directly abut against the tooth part 1, thereby further limiting the tooth part 1 and improving the stability of the tooth part 1 limiting.

[0062] This application does not impose specific limitations on the location and structure of the inner ring limiting part 212. In one embodiment, the inner ring limiting part 212 protrudes from the outer wall of the inner shell 300.

[0063] In another embodiment, please refer to Figure 3 The inner ring limiting part 212 includes an inner ring end plate 2121, which is located on one side of the inner housing 300 along its axial direction F1. The side wall of the inner ring end plate 2121 has a plurality of protrusions 2122 protruding along its circumferential direction F3, and each protrusion 2122 abuts against a tooth 1. One end of the axial limiting post 22 abuts against the outer housing 200, and the other end is connected to the protrusion 2122.

[0064] It is known that a coil is to be sleeved around the tooth 1, so the tooth 1 is spaced apart from the inner and outer shells 200; an inner ring end plate 2121 is provided on one side of the inner shell 300, and a protrusion 2122 is provided on the side wall of the inner ring end plate 2121. By using the protrusion 2122 to abut against the tooth 1, the tooth 1 is limited and fixed; at the same time, the protrusion 2122 is provided corresponding to the auxiliary groove 12 so that when the axial limiting post 22 passes through the auxiliary groove 12, its other end can be connected to the protrusion 2122.

[0065] Furthermore, the inner ring end plate 2121 is arranged in a ring shape, and the outer diameter of the inner ring end plate 2121 is larger than the outer diameter of the inner shell 300; the inner ring end plate 2121 can be detachably installed on the inner shell 300 by means of a bolt fastening structure.

[0066] This application does not impose specific restrictions on the connection method between the axial limiting post 22 and the protrusion 2122. In one embodiment, the other end of the axial limiting post 22 is limited by the protrusion 2122; in another embodiment, the axial limiting post 22 and the protrusion 2122 are integrally formed.

[0067] Following the statement that "the inner ring end plate 2121 is disposed on one side of the inner housing 300 in its axial direction F1", in order to avoid the setting of the inner ring end plate 2121 affecting the air gap of the disc motor, in one embodiment, the height of the inner ring end plate 2121 in the axial direction F1 of the outer housing 200 does not exceed the height of the tooth 1.

[0068] It should be noted that the above two technical features can be set individually or simultaneously. Specifically, in one embodiment, both technical features are set simultaneously.

[0069] In one embodiment, the positioning structure 2 includes two radial limiting parts 21, which are spaced apart on the axial direction F1 of the outer shell 200 and correspond to two axial limiting posts 22 respectively; in this way, the tooth 1 can be subjected to uniform force and has better stability.

[0070] Continuing from the previous statement that "the two ends of the axial limiting post 22 are respectively connected to the outer shell 200 and the inner shell 300", that is, the two axial limiting posts 22 together limit and fix the tooth 1 in the axial direction F1 of the outer shell 200. In order to further improve the limiting stability of the axial limiting post 22, in one embodiment, two sets of avoidance structures are provided on the inner sidewall of the outer shell 200. The two sets of avoidance structures are arranged side by side in the axial direction F1 of the outer shell 200. The avoidance structure includes a plurality of first avoidance grooves. Each first avoidance groove corresponds to an auxiliary groove 12, so that when the axial limiting post 22 passes through the auxiliary groove 12, one end of it can be inserted into the corresponding first avoidance groove and abut against the bottom of the first avoidance groove.

[0071] Meanwhile, to facilitate the installation of the axial limiting post 22, in one embodiment, please refer to... Figure 1 , Figure 6 and Figure 7 From the bottom of the auxiliary groove 12 toward its opening, the wall of the first clearance groove penetrates the outer shell 200 to form an open first notch 201 on one side end face of the outer shell 200; the core structure 100 also includes two outer ring cover plates 3, which are respectively disposed on both sides of the outer shell 200 along its axial direction F1, and cover the corresponding first notches 201; by covering the corresponding first notches 201 on the outer ring cover plates 3, one end of the axial limiting post 22 is pressed down, thereby improving the limiting stability of the axial limiting post 22.

[0072] Thus, during installation, the end of the axial limiting post 22 can be positioned in the first clearance groove through the first notch 201; after the axial limiting post 22 is installed, the outer ring cover plate 3 is placed on one side of the outer shell 200, and covers the corresponding first notches 201. The outer ring cover plate 3 and the outer shell 200 are detachably installed via a bolt fastening structure.

[0073] To ensure installation strength, the distance L between the center line of the threaded hole of the outer casing 200 and the inner wall of the nearest side of the adjacent first notch 201 must be equal to 2 to 3 times the diameter of the threaded hole.

[0074] Furthermore, following the previous statement that "the radial limiting part 21 includes an outer ring limiting part 211, and the outer ring limiting part 211 limits the tooth part 1 and the outer shell 200", in order to further improve the stability of the outer ring limiting part 211, in one embodiment, the avoidance structure also includes a plurality of second avoidance grooves, each second avoidance groove corresponding to a radial limiting part 21, so that one end of the outer ring limiting part 211 can be inserted. From the bottom of the auxiliary groove 12 to its opening, the groove wall of the second avoidance groove penetrates the outer shell 200 to form an open second notch 202 on the outer shell 200; wherein, the outer ring cover plate 3 covers the plurality of second notches 202 on the corresponding side; by covering the plurality of second notches 202 on the corresponding side by the outer ring cover plate 3, one end of the outer ring limiting part 211 is pressed down, thereby improving the limiting stability of the outer ring limiting part 211.

[0075] The aforementioned core structure 100 is applied to the stator assembly 1000. Please refer to [link / reference]. Figure 1 The stator assembly 1000 includes a nested outer shell 200 and an inner shell 300, and a core structure 100 disposed between the two.

[0076] Two axial limiting posts 22 are respectively inserted through auxiliary slots 12. The two ends of the axial limiting posts 22 are connected to the outer shell 200 and the inner shell 300, respectively. This allows the toothed portion 1 to be positioned at the upper limit of the outer shell 200 in the axial direction F1, and the toothed portion 1 to be fixed at the upper limit of the outer shell 200 in the radial direction F2 through the engagement of the radial limiting portion 21 with the slot wedge 400. This achieves the positioning of the yokeless iron core. Furthermore, by setting the axial limiting posts 22 with a uniform cross-section in the radial direction F2 of the outer shell 200, cutting of the axial limiting posts 22 is avoided. This not only simplifies the manufacturing process of the axial limiting posts 22, but also improves the strength of the axial limiting posts 22, ensuring the stability of the positioning of the yokeless iron core.

[0077] The stator assembly 1000 described above is used in a disc motor, which includes the stator assembly 1000 and two rotors located on both sides of its axial direction F1.

[0078] 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 provided between an outer housing and an inner housing which are nested, the core structure comprising a plurality of tooth portions which are arranged at intervals in a circumferential direction of the outer housing, characterized in that, In the axial direction of the outer casing, at least one tooth surface of the tooth is provided with an auxiliary groove, and in the radial direction of the outer casing, the two side walls of the auxiliary groove penetrate the tooth. The core structure further includes multiple separately arranged positioning structures, each positioning structure corresponding to one of the core teeth, and the positioning structure includes: A radial limiting portion, at least located between the teeth and the outer casing, to radially limit the teeth within the outer casing; and At least one axial limiting post is provided, which is correspondingly inserted through the auxiliary groove. The two ends of the axial limiting post are respectively connected to the outer shell and the inner shell. The axial limiting post is arranged with a uniform cross section in the radial direction of the outer shell.

2. The core structure of claim 1, wherein The angle between the inner wall and the bottom wall of the auxiliary groove in the circumferential direction of the outer shell is not less than 90°.

3. The core structure of claim 1, wherein In the axial direction of the outer shell, the radial limiting part is disposed on the same side as the axial limiting post. The radial limiting part includes an outer ring limiting part. The outer ring limiting part is located at least on one side of the axial limiting post in the circumferential direction of the outer shell and is spaced apart from the axial limiting post. The outer ring limiting part abuts against the tooth and the outer shell.

4. The core structure of claim 3, wherein The outer ring limiting part includes two limiting blocks, which are respectively disposed on both sides of the corresponding axial limiting post in the circumferential direction of the outer shell. The two limiting blocks are spaced apart from the axial limiting post, and each limiting block abuts against the tooth and the outer shell.

5. The core structure of claim 3, wherein The radial limiting part further includes an inner ring limiting part, which is disposed on the inner housing and abuts against the toothed part; The two ends of the axial limiting post are respectively connected to the outer shell and the inner ring limiting part.

6. The core structure according to claim 5, characterized in that, The inner ring limiting part includes an inner ring end plate, which is disposed on one side of the inner housing in its axial direction. The side wall of the inner ring end plate has a plurality of protrusions protruding in its circumferential direction, and each of the protrusions abuts against one of the teeth. One end of the axial limiting post abuts against the outer shell, and the other end is connected to the protrusion.

7. The core structure of claim 6, wherein The axial limiting post is integrally formed with the protrusion; and / or In the axial direction of the outer casing, the height of the inner ring end plate does not exceed the height of the teeth.

8. The core structure of claim 1, wherein The auxiliary groove is provided on both of the two opposing tooth surfaces of the tooth portion; Correspondingly, the positioning structure includes two axial limiting posts, each of which is inserted into one of the auxiliary grooves; Correspondingly, two radial limiting parts are provided, and each radial limiting part corresponds to one axial limiting post.

9. The core structure of claim 1, wherein The outer shell has a plurality of clearance portions on one end face corresponding to the axial limiting post. The plurality of clearance portions are arranged at intervals along the circumference of the outer shell and correspond to the plurality of teeth. The clearance portion includes a first notch, which corresponds to the auxiliary groove, so that when the axial limiting post passes through the auxiliary groove, one end of it can be accommodated in the first notch. The core structure also includes an outer ring cover plate, which is disposed on the end face and covers multiple of the first notches.

10. The core structure of claim 9, wherein The radial limiting portion includes an outer ring limiting portion, which limits the tooth portion and the outer shell; The avoiding part further comprises a plurality of second notches, each of which corresponds to one of the outer ring limiting parts for inserting one end of the outer ring limiting part; The outer ring cover plate covers the plurality of second notches.

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