Iron core structure

Abstract

This utility model discloses an iron core structure disposed between nested outer and inner shells. The iron core structure includes multiple teeth spaced apart along the circumference of the outer shell, with a coil sleeved around the teeth. In the axial direction of the outer shell, at least one tooth surface of the teeth has an auxiliary groove, and in the radial direction of the outer shell, the two side walls of the auxiliary groove penetrate the teeth. Multiple positioning structures are separately arranged, 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 includes a limiting block that abuts against the teeth and the outer shell. The limiting block has a slot on one side surface facing the coil to hold and fix the coil. The axial limiting post is correspondingly inserted through the auxiliary groove, and the two ends of the axial limiting post are respectively connected to the outer shell and the inner 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. Axial positioning of the core is achieved using auxiliary slots and axial limiting posts, while radial positioning is achieved using slot wedges and radial positioning posts. Notches and cover plates are typically added to the outer casing to further improve the positioning stability of the axial and radial positioning posts. Since the notches on the outer casing are machined, the manufacturing process is difficult and costly. Utility Model Content

[0003] The main objective of this invention is to propose a core structure that, while achieving the fixation of a yokeless core, reduces processing difficulty and lowers processing costs.

[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. A coil is sleeved around the teeth. An auxiliary groove is formed on at least one tooth surface of the teeth in the axial direction of the outer shell. The two side walls of the auxiliary groove penetrate the teeth in the radial direction of the outer shell.

[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] The radial limiting portion includes a limiting block that abuts against the teeth and the outer casing, the limiting block having a slot on one side surface facing the coil to hold and fix the coil; and,

[0007] At least one axial limiting post is provided, which is correspondingly inserted through the auxiliary groove, and the two ends of the axial limiting post are respectively connected to the outer shell and the inner shell.

[0008] Preferably, the axial limiting post is configured as a fiberglass rod, the fiberglass rod being made of continuous fiberglass and arranged in a single layer; and / or,

[0009] The limiting block is made of short glass fiber.

[0010] Preferably, in the axial direction of the outer casing, the radial limiting portion and the axial limiting post are disposed on the same side;

[0011] The limiting block is located at least on one side of the corresponding axial limiting post in the circumferential direction of the outer shell, and the limiting block has the slot on the side surface facing the coil.

[0012] Preferably, the radial 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.

[0013] Preferably, in the radial direction of the outer casing, the surface of the limiting block abutting the tooth is adapted to the shape of the tooth; and / or,

[0014] In the radial direction of the outer casing, the limiting block abuts against the surface of the outer casing and is adapted to the shape of the inner ring surface of the outer casing.

[0015] Preferably, the groove wall of the card slot is flared outward near its opening.

[0016] Preferably, the slot and the coil are in a gap fit, and the gap between the slot and the coil is filled with a first adhesive portion.

[0017] Preferably, the radial limiting part further 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 is provided with a plurality of protrusions along its circumference, and each of the protrusions abuts against one of the teeth.

[0018] The two ends of the axial limiting post abut against the outer shell and the protrusion, respectively.

[0019] Preferably, the auxiliary groove is formed on both opposite tooth surfaces of the tooth portion;

[0020] Correspondingly, the positioning structure includes two axial limiting posts, each of which is inserted into one of the auxiliary grooves;

[0021] Correspondingly, two radial limiting parts are provided, and each radial limiting part corresponds to one axial limiting post.

[0022] Preferably, 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.

[0023] The core structure also includes an outer ring cover plate, which is disposed on the end face and covers multiple of the first notches.

[0024] The technical solution provided by this utility model has at least the following advantages:

[0025] The core structure provided by this utility model includes multiple teeth arranged radially along the circumference of the outer shell. At least one tooth surface of each tooth has an auxiliary groove, which penetrates both sides of the outer shell in the radial direction. This auxiliary groove reduces harmonic components in the magnetic field and adjusts the air gap magnetic field distribution to be more uniform. An axial limiting post passes through the auxiliary groove, with its two ends connected to the outer shell and inner shell respectively. This limits the teeth axially within the outer shell, and the limiting block further limits and fixes the teeth radially within the outer shell, thus achieving the positioning of the yokeless core. The limiting block abuts against the teeth and the outer shell. No notches are needed on the outer shell to accommodate the limiting block; that is, only notches to accommodate the axial limiting post need to be machined on the outer shell. This reduces the number of notches required for machining, simplifies the process, and lowers the cost. Furthermore, the coil is secured by a slot on the limiting block, further improving the stability of the core structure. Attached Figure Description

[0026] 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.

[0027] Figure 1 A schematic diagram of a stator assembly according to an embodiment of the present invention;

[0028] Figure 2 for Figure 1 An exploded view of the stator assembly;

[0029] Figure 3 for Figure 1 A cross-sectional view of the stator assembly along AA;

[0030] Figure 4 for Figure 1 A schematic diagram of the stator assembly (without the outer ring cover);

[0031] Figure 5 for Figure 4 The stator assembly is shown in the diagram with respect to the teeth and axial limiting post.

[0032] Figure 6 for Figure 5 A schematic diagram of the stator assembly with respect to the limiting block;

[0033] Figure 7 for Figure 4 An enlarged schematic diagram of part B of the stator assembly;

[0034] Figure 8 for Figure 7 A schematic diagram of the stator assembly (excluding the axial limiting post and limiting block);

[0035] Figure 9 for Figure 1 A cross-sectional view of the stator assembly along CC.

[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 Limiting block; 2111 Slot; 212 Inner ring limiting part; 2121 Inner ring end plate; 2122 Protrusion; 22 Axial limiting post; 3 Outer ring cover plate; 4 Coil; 200 Outer shell; 201 First 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 a disc motor without a yoke stator, the stator assembly typically includes positioning posts, a stator core, and concentrated windings mounted on the stator core. Axial positioning of the core is achieved using auxiliary slots and axial limiting posts, while radial positioning is achieved using slot wedges and radial positioning posts. Notches and cover plates are usually provided on the outer casing to further improve the positioning stability of the axial and radial positioning posts. Since the notches are machined, the manufacturing process is difficult and costly.

[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 4 The 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] On the axial direction F1 of the outer casing 200, auxiliary grooves 12 are formed on the two opposing tooth surfaces 11 of the tooth 1. The auxiliary grooves 12 are arranged through the two side walls on the radial direction F2 of the outer casing 200. By setting the auxiliary grooves 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 regulating the magnetic flux of the motor.

[0046] Meanwhile, the core structure 100 also includes multiple sets of positioning structures 2 corresponding to multiple teeth 1. Each set of positioning structures 2 includes a radial limiting part 21 and at least one axial limiting post 22. The radial limiting part 21 includes a limiting block 211 that abuts against the teeth 1 and the outer shell 200. The axial limiting post 22 passes through the auxiliary groove 12, and the two ends of the axial limiting post 22 are respectively connected to the outer shell 200 and the inner shell 300.

[0047] In other words, by setting an axial limiting post 22 through an auxiliary groove 12, the two ends of the axial limiting post 22 are connected to the outer shell 200 and the inner shell 300 respectively, thereby limiting the tooth 1 in the axial direction F1 of the outer shell 200, and by cooperating with the groove wedge 400 through the limiting block 211, limiting and fixing the tooth 1 in the radial direction F2 of the outer shell 200, thus achieving the positioning of the yokeless iron core and improving the stability of the iron core.

[0048] Furthermore, since the limiting block 211 abuts against the toothed portion 1 and the outer shell 200, there is no need to provide a notch on the outer shell 200 to accommodate the limiting block 211. In other words, only a notch to accommodate the axial limiting post 22 needs to be machined on the outer shell 200. The number of notches that need to be machined on the outer shell 200 is small, making the machining simpler and the cost lower. Moreover, compared to machining notches on the outer shell 200, the machining process of opening a slot 2111 on the limiting block 211 is simpler. Furthermore, the coil 4 is fixed by the slot 2111 on the limiting block 211, thereby further improving the stability of the core structure 100.

[0049] Understandably, in related technologies, when assembling the stator assembly 1000, the tooth 1 and coil 4 are first positioned using tooling, and the slot wedge 400 and axial limiting post 22 are inserted. Then, they are fixed using a paint dripping process to form a semi-assembly. The inner housing 300 and outer housing 200 are fixed to the tooling respectively, and then the semi-assembly is placed between the inner housing 300 and the outer housing 200, with the semi-assembly abutting against the inner ring cover plate on the inner housing 300. A radial F2 positioning post is set on the outer housing 200, and the outer ring cover plate 3 is used to press down the axial limiting post 22 and the radial F2 positioning post on the outer housing 200. Thus, in order to ensure the smooth assembly of the stator assembly 1000, all components are set to clearance fit, and structural adhesive is filled in the gaps for fixation, making the assembly process complicated.

[0050] In this invention, the limiting block 211 and the axial limiting post 22 are first placed on one side of the tooth 1, and a slot wedge 400 is inserted between adjacent teeth 1. Then, glue is used to fix them, thereby forming a yoke-like structure on one side of the tooth 1. The coil 4 is then sleeved around the tooth 1, and the coil 4 is partially inserted into the slot 2111 of the limiting block 211. Semi-solid potting glue is placed on the radial F2 of the outer shell 200 between the coil 4 and the tooth 1. Expanding insulating paper is placed on the circumferential F3 of the outer shell 200 between the coil 4 and the tooth 1. The limiting block 211 and the axial limiting post 22 are placed on the other side of the tooth 1 and fixed with structural glue.

[0051] This assembly scheme eliminates the need for tooling to fix the tooth 1 and coil 4 into a semi-assembled body. Instead, it directly uses the limiting block 211 and axial limiting post 22 to form a yoke structure on one side of the tooth 1. This requires fewer tooling and fewer assembly steps, thus simplifying the assembly process. Furthermore, compared to the dripping process for fixing the coil 4 and tooth 1, the process of placing a semi-solid potting compound between the coil 4 and tooth 1 and then curing it is simpler and more convenient to operate.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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. From a manufacturing process perspective, it is preferable that the cross-sections of the auxiliary groove 12 and the axial limiting post 22 are square. Furthermore, the cross-sectional shapes of the axial limiting post 22 and the auxiliary groove 12 are compatible.

[0057] 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 a second adhesive portion.

[0058] 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.

[0059] The limiting block 211 is made of short glass fiber. The limiting block 211 is usually formed by injection molding, where the short glass fiber is mixed with resin and then injected into a mold. The limiting block 211 is then cut to form the slot 2111; thus, the forming process of the slot 2111 is simpler.

[0060] It should be noted that the materials of the axial limiting post 22 and the limiting block 211 can be chosen as one or both. Specifically, in one embodiment, both technical features are provided simultaneously.

[0061] This application does not specifically limit the location of the radial limiting part 21. Preferably, in one embodiment, please refer to... Figures 4 to 6 The radial limiting part 21 is provided corresponding to one of the axial limiting posts 22 and is located on the side of the coil 4 on the axial direction F1 of the outer shell 200; the limiting block 211 is located at least on the side of the corresponding axial limiting post 22 on the circumferential direction F3 of the outer shell 200, and the limiting block 211 has a slot 2111 on the side surface facing the coil 4.

[0062] In other words, in this embodiment, a groove wedge 400 is provided between two adjacent teeth 1. When the limiting block 211 abuts against the tooth 1 and the outer shell 200, the groove wedge 400 and the limiting block 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.

[0063] Following the previous statement "the limiting block 211 abuts against the toothed part 1 and the outer shell 200", in order to avoid the setting of the limiting block 211 affecting the air gap of the disc motor, in one embodiment, the height of the limiting block 211 on the axial F1 of the outer shell 200 does not exceed the height of the corresponding axial limiting post 22.

[0064] Specifically, please refer to Figure 4 and Figure 5 The limiting block 211 includes two limiting blocks 211, which are respectively disposed on both sides of the corresponding axial limiting post 22 on the outer shell 200 circumferential F3; wherein, the slot 2111 is disposed on the side surface of the limiting block 211 facing the coil 4.

[0065] In this application, on the radial direction F2 of the outer shell 200, the surface of the limiting block 211 abutting the tooth 1 is adapted to the shape of the tooth 1; thus, the limiting block 211 and the tooth 1 can be assembled in place.

[0066] In this application, on the radial direction F2 of the outer shell 200, the limiting block 211 abuts against the surface of the outer shell 200 and is adapted to the shape of the inner ring surface of the outer shell 200; thus, the limiting block 211 and the outer shell 200 can be assembled in place.

[0067] It should be noted that the above two technical features can be set individually or simultaneously; specifically, in one embodiment, the above two technical features are set simultaneously.

[0068] Following on "using the limiting block 211 as the positioning reference", in one embodiment, please refer to Figure 5 On the circumferential F3 of the outer shell 200, the limiting block 211 is connected to the axial limiting post 22; by setting the limiting block 211 to be connected to the axial limiting post 22, the strength of the limiting block 211 can be improved.

[0069] This application does not impose specific restrictions on the connection method between the limiting block 211 and the axial limiting post 22. Specifically, the limiting block 211 and the axial limiting post 22 are bonded and fixed together.

[0070] During the assembly process, to facilitate the assembly of the limiting block 211, in one embodiment, please refer to... Figure 6 and Figure 6 The groove wall of the card slot 2111 is set outward near its opening.

[0071] It is understandable that during the assembly process, since the outer periphery of the coil 4 is uneven during the winding process, in order to ensure that the slot 2111 of the limiting block 211 can hold the coil 4, in one embodiment, the slot 2111 and the coil 4 are in a gap fit.

[0072] Meanwhile, in order to ensure that the slot 2111 can hold and fix the coil 4, in one embodiment, the core structure 100 further includes a first adhesive portion, which is filled between the slot 2111 and the coil 4; that is, during the assembly process, after the slot 2111 of the limiting block 211 holds the coil 4, structural adhesive is filled between the slot 2111 and the coil 4, thereby forming a first adhesive portion between the slot 2111 and the coil 4, so that the coil 4 is held and fixed in the slot 2111.

[0073] Although the limiting block 211 and the slot wedge 400 can jointly limit the tooth 1 in the radial direction F2 of the outer casing 200, the stability is poor. In one embodiment, please refer to... Figure 4 The radial limiting part 21 also includes an inner ring limiting part 212, which is provided on the inner shell 300. When the limiting block 211 abuts against the tooth 1 and the outer shell 200, the tooth 1 abuts against the inner ring limiting part 212. The two ends of the axial limiting post 22 are respectively connected to the outer shell 200 and the inner ring limiting part 212.

[0074] In this embodiment, in addition to limiting the tooth 1 together by the limiting block 211 and the groove wedge 400, an inner ring limiting part 212 is also provided on the inner shell 300 to directly abut against the tooth 1, thereby further limiting the tooth 1 and improving the stability of the tooth 1 limiting.

[0075] 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.

[0076] In another embodiment, please refer to Figure 2 and Figure 4 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.

[0077] It is known that a coil 4 is to be sleeved around the tooth 1, so the tooth 1 is spaced apart from the inner shell 300 and the outer shell 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.

[0078] 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.

[0079] 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 abuts against the protrusion 2122; in another embodiment, the axial limiting post 22 and the protrusion 2122 are integrally formed.

[0080] 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.

[0081] In one embodiment, the positioning structure 2 includes two sets of 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 teeth 1 can be subjected to uniform force and have better stability.

[0082] Meanwhile, to facilitate the installation of the axial limiting post 22, in one embodiment, please refer to... Figure 1 , Figure 8 and Figure 9 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.

[0083] 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.

[0084] 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.

[0085] It is understandable that the first notch 201 on the outer shell 200 is formed by machining. Since the limiting block 211 abuts against the tooth 1 and the outer shell 200, there is no need to set other notches on the outer shell 200 to accommodate the limiting block 211. In other words, the outer shell 200 only needs to be machined to accommodate the first notch 201 of the axial limiting post 22. Thus, the number of notches that need to be machined on the outer shell 200 is small, the machining is simple, and the cost is low.

[0086] The aforementioned core structure 100 is applied to a 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.

[0087] 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 tooth 1 to be positioned in the axial direction F1 of the outer shell 200. The tooth 1 is also positioned and fixed in the radial direction F2 of the outer shell 200 by the limiting block 211 cooperating with the slot wedge 400. This achieves the positioning of the yokeless iron core. The limiting block 211 abuts against the tooth 1 and the outer shell 200. There is no need to provide a notch on the outer shell 200 to accommodate the limiting block 211. In other words, only a notch to accommodate the axial limiting posts 22 needs to be machined on the outer shell 200. The number of notches that need to be machined on the outer shell 200 is small, the processing is simple, and the cost is low.

[0088] 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.

[0089] 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, the tooth portions having coils fitted therearound, 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: The radial limiting portion includes a limiting block that abuts against the teeth and the outer casing, the limiting block having a slot on one side surface facing the coil to hold and fix the coil; and, At least one axial limiting post is provided, which is correspondingly inserted through the auxiliary groove, and the two ends of the axial limiting post are respectively connected to the outer shell and the inner shell.

2. The core structure of claim 1, wherein The axial limiting post is configured as a fiberglass rod, the fiberglass rod being made of continuous fiberglass and arranged in a single layer; and / or, The limiting block is made of short glass fiber.

3. The core structure according to claim 1, characterized in that, Along the axial direction of the outer casing, the radial limiting portion is disposed on the same side as the axial limiting post; The limiting block is located at least on one side of the corresponding axial limiting post in the circumferential direction of the outer shell, and the limiting block has the slot on the side surface facing the coil.

4. The core structure of claim 3, wherein The radial 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.

5. The core structure of claim 3, wherein In the radial direction of the outer casing, the surface of the limiting block abutting the tooth is adapted to the shape of the tooth; and / or, In the radial direction of the outer casing, the limiting block abuts against the surface of the outer casing and is adapted to the shape of the inner ring surface of the outer casing.

6. The core structure of claim 1, wherein The groove wall of the card slot is set outward near its opening.

7. The core structure of claim 1, wherein The slot and the coil are in a gap fit, and the gap between the slot and the coil is filled with a first adhesive portion.

8. The core structure of claim 1, wherein The radial limiting part also 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. The two ends of the axial limiting post abut against the outer shell and the protrusion, respectively.

9. 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.

10. 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.

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