Stator fixing structure, motor and electric tool
By adopting the limit structure and multiple limiting rib design in the power tool, the stator core is directly fixed, which simplifies the installation steps and improves stability, and solves the problem of unfixed stator in the prior art, and realizes the More efficient assembly and use.
Patent Information
- Application Number
- CN202420919843.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-04-29
AI Technical Summary
The stability of the stator fixing structure in existing power tools is not high and the assembly is complicated, which makes the stator and rotor easy to rub against each other, and multiple parts are required. The assembly steps are cumbersome, especially in the case of large vibration and high heat generation, which is not firmly fixed.
Using a structural design including a shell, a stator core, a first winding frame and a cover body, the stator core is directly installed into the shell through a limit structure and a plurality of limiting convex ribs. The first and second winding frames prevent rotation and movement of the stator core, reduce dependence on independent pressure plates or bolts, and simplify installation steps.
The stability and simplified assembly of the stator fixed structure are achieved, the installation steps and time of the stator core are saved, and the overall reliability of the power tool is improved.
Smart Images
Figure CN222356057U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of electric tools, and in particular relates to a stator fixing structure, a motor and an electric tool. Background Art
[0002] Power tools are generally equipped with brushless motors that provide power sources. Brushless motors generate a rotating magnetic field by changing the current input to the stator coil and act on the rotor to form a rotating torque, thereby driving the rotor assembly to rotate. At present, the stator is generally installed in the motor housing. When fixing the stator, it is mainly fixed by directly locking the stator with a separate pressure plate or screws. This fixing method requires a large number of parts and is complicated to assemble. In addition, for power tools with large vibrations and high heat generation, the stability of the pressure plate and screws is not high, which can easily lead to failure of the stator fixing structure and cause the stator and rotor to rub against each other. Utility Model Content
[0003] The utility model aims to provide a stator fixing structure, a motor and an electric tool, which have reliable structural fixing and simple assembly steps, and can save the installation steps and installation time of the stator core.
[0004] In order to achieve the above-mentioned purpose, a specific embodiment of the utility model provides a stator fixing structure, including a shell, a stator core, a first winding frame and a cover body. The shell includes a shell body, a limiting structure and a plurality of second limiting convex ribs, one end of the shell body is provided with an opening, and the limiting structure and the plurality of second limiting convex ribs are arranged on the circumferential inner wall of the shell body and are located inside the shell body. The stator core is arranged in the shell body. The first winding frame is sleeved on one end of the stator core, and the first winding frame includes a first winding frame body and a first protruding structure, the first protruding structure cooperates with the limiting structure and is arranged on the first winding frame body and protrudes axially and / or radially from the first winding frame body. The second winding frame is sleeved on the other end of the stator core. The cover body is installed at the opening of the shell body. Among them, the first winding frame abuts against the shell body in the axial direction of the stator core, the inner side of the cover body abuts against the second winding frame in the axial direction of the stator core, and the plurality of second limiting convex ribs abut against the stator core in the circumferential direction of the stator core and are interference fit with it.
[0005] In one or more embodiments of the present invention, the shell further comprises a third limiting rib disposed on the inner wall of the shell body, and the third limiting rib abuts against the first winding frame in the axial direction of the stator core.
[0006] In one or more embodiments of the utility model, the limiting structure includes two first limiting ribs arranged at intervals, the two first limiting ribs are respectively clamped on both sides of the first protruding structure in the circumferential direction of the stator core, and the third limiting rib is arranged between the two first limiting ribs, and the third limiting rib abuts against the first protruding structure in the axial direction of the stator core.
[0007] In one or more embodiments of the present invention, the first protruding structure and the third limiting rib are in surface contact.
[0008] In one or more embodiments of the present invention, the cover includes a cover body and a fourth limiting rib, the fourth limiting rib is arranged on the inner wall of the cover body, and the fourth limiting rib abuts against the second winding frame in the axial direction of the stator core.
[0009] In one or more embodiments of the present invention, the second winding frame includes a second winding frame body and a second protruding structure, the second protruding structure is arranged on the second winding frame body and protrudes axially or radially from the second winding frame body, a plurality of fourth limiting ribs are provided, and at least part of the fourth limiting ribs abut against the second protruding structure in the axial direction of the stator core.
[0010] In one or more embodiments of the utility model, the shell body is provided with a threaded sleeve, the inner wall of the threaded sleeve is provided with internal threads, the cover body is axially provided with a threaded hole, and screws are connected in the threaded hole and the threaded sleeve.
[0011] In one or more embodiments of the present invention, the threaded sleeve is embedded in the housing body by injection molding, and the outer wall of the threaded sleeve is provided with an external thread.
[0012] Another specific implementation manner of the present utility model further provides a motor, comprising the stator fixing structure as described above.
[0013] Another specific implementation manner of the utility model further provides an electric tool, comprising the above-mentioned motor.
[0014] Compared with the prior art, the stator fixing structure, motor and electric tool of the utility model set the limiting structure and the second limiting rib for limiting the movement and rotation of the stator core on the inner wall of the shell body. When installing the stator core, the stator core can be directly installed into the shell body without using an independent pressure plate or bolts to connect the stator core to the shell body, saving the installation steps and installation time of the stator core. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings described below are only some implementations recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0016] Figure 1 This is an exploded structural diagram of a stator fixing structure in one embodiment of the utility model;
[0017] Figure 2This is a structural diagram of a housing in one embodiment of the utility model;
[0018] Figure 3 This is a structural diagram of a first winding frame in one embodiment of the utility model;
[0019] Figure 4 This is a structural diagram of the second winding frame in one embodiment of the utility model;
[0020] Figure 5 This is a planar structural diagram of a stator fixing structure in one embodiment of the utility model;
[0021] Figure 6 This is a three-dimensional structural diagram of a cover body in one embodiment of the utility model;
[0022] Figure 7 This is an exploded structural diagram of the shell and the cover in one embodiment of the utility model;
[0023] Figure 8 It is a cross-sectional view of a stator fixing structure in one embodiment of the present invention.
[0024] Explanation of main figure marks: 1. Shell, 11. Shell body, 12. Limiting structure, 121. First limiting rib, 13. Second limiting rib, 14. Third limiting rib, 15. Threaded sleeve, 2. Stator core, 3. First winding frame, 31. First winding frame body, 32. First protruding structure, 4. Second winding frame, 41. Second winding frame body, 42. Second protruding structure, 5. Cover body, 51. Cover body, 52. Fourth limiting rib, 53. Threaded hole, 6. Screw, 7. Winding part. DETAILED DESCRIPTION
[0025] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the implementation of the present invention will be clearly and completely described below in conjunction with the drawings in the implementation of the present invention. Obviously, the described implementation is only a part of the implementation of the present invention, not all of the implementations. Based on the implementation of the present invention, all other implementations obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.
[0026] In the description of the present invention, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0027] like Figures 1 to 8 As shown, the stator fixing structure in one embodiment of the utility model comprises a housing 1, a stator core 2, a first winding frame 3, a second winding frame 4 and a cover 5. The housing 1 comprises a housing body 11, a limiting structure 12 and a plurality of second limiting convex ribs 13. The housing body 11 is hollow cylindrical and has an opening at one end for accommodating the stator core 2, the first winding frame 3 and the second winding frame 4. The limiting structure 12 and the plurality of second limiting convex ribs 13 are arranged on the circumferential inner wall of the housing body 11 and are located inside the housing body 11. The stator core 2 is arranged inside the housing body 11. The first winding frame 3 is sleeved on one end of the stator core 2. The first winding frame 3 includes a first winding frame body 31 and a first protruding structure 32. The first protruding structure 32 cooperates with the limiting structure 12 to prevent the stator core 2 from rotating. The first protruding structure 32 is arranged on the first winding frame body 31 and protrudes axially and / or radially from the first winding frame body 31. The first protruding structure 32 can be configured as a plate or a block. The second winding frame 4 is sleeved on the other end of the stator core 2. The cover body 5 is installed at the opening of the shell body 11. Among them, the first winding frame 3 abuts against the inside of the shell 1 in the axial direction of the stator core 2, and the inner side of the cover body 5 abuts against the second winding frame 4 in the axial direction of the stator core 2, thereby preventing the stator core 2 from moving axially. The second limiting rib 13 abuts against the stator core 2 and has an interference fit with the stator core 2, thereby preventing the stator core 2 from moving radially.
[0028] Those skilled in the art can understand that the first winding frame 3 and the second winding frame 4 both have a winding portion 7, the first winding frame 3 and the second winding frame 4 are sleeved on both sides of the stator core 2, the winding portion 7 is combined with the stator core 2, and after winding, the stator core 2, the first winding frame 3 and the second winding frame 4 can form an integral structure. Therefore, the limiting structure 12 prevents the first winding frame 3 from rotating after combining with the first protruding structure 32, which can be regarded as preventing the stator core 2 from rotating. Similarly, the shell 1 and the cover 5 prevent the first winding frame 3 and the second winding frame 4 from axial movement, which can be regarded as preventing the stator core 2 from axial movement.
[0029] In the above embodiment, the second limiting rib 13 is in interference fit with the stator core 2, which is equivalent to the second limiting rib 13 clamping the stator core 2 from the outside of the stator core 2 to prevent the stator core 2 from moving radially. The inner side of the housing 1 and the inner side of the cover 5 are respectively in contact with the first winding frame 3 and the second winding frame 4, which is equivalent to the housing 1 and the cover 5 abutting the stator core 2 from both sides of the stator core 2 to prevent the stator core 2 from moving axially. The first protruding structure 32 and the limiting structure 12 can be matched in a manner such as snap-fit, plug-in, abutment, and interference fit. When the snap-fit matching method is adopted, the limiting structure 12 needs to be clamped in the rotation direction of the first protruding structure 32 to prevent the stator core 2 from rotating. When the plug-in matching method is adopted, the limiting structure 12 can be inserted into the first protruding structure 32 in the axial direction of the stator core 2 to prevent the stator core 2 from rotating.
[0030] It can be seen from the above embodiment that the limiting structure 12 and the second limiting rib 13 for limiting the movement and rotation of the stator core 2 are both fixed on the inner wall of the shell body 11. When assembling the stator core 2, it can be directly installed into the shell body 11 without using an independent pressure plate or bolts to connect the stator core 2 to the shell body 11, thereby saving the installation steps and installation time of the stator core 2.
[0031] In addition, it should be noted that the contact part between the first winding frame 3 and the housing 1 can be the inner wall of the housing 1, or can also be other structures such as convex ribs on the inner wall of the housing 1. Similarly, the contact part between the inner side of the cover 5 and the second winding frame 4 can be the inner wall of the cover 5, or can also be other structures such as convex ribs on the inner wall of the cover 5.
[0032] In one embodiment, in order to facilitate the abutment between the shell 1 and the first winding frame 3, the shell 1 also includes a third limiting rib 14 provided on the inner wall of the shell body 11. In the axial direction of the stator core 2, the shell 1 abuts against the first winding frame 3 through the third limiting rib 14.
[0033] Further, such as Figure 2 and Figure 5 As shown, in order to facilitate positioning and installation when installing the stator core 2, the limiting structure 12 includes two first limiting ribs 121 arranged at intervals, and the two first limiting ribs 121 are respectively clamped on both sides of the first protruding structure 32 in the circumferential direction of the stator core 2, and the third limiting rib 14 is arranged between the two first limiting ribs 121 of the limiting structure 12, and the third limiting rib 14 is in contact with the first protruding structure 32 in the axial direction of the stator core 2.
[0034] Those skilled in the art can understand that a plurality of accommodating cavities are generally provided inside the housing 1, and one of the accommodating cavities is used to install the stator core 2 and the rotor and other components. In order to make full use of the space of the accommodating cavity, when installing the stator core 2, the first winding frame 3 and the second winding frame 4 will be as close to the end of the accommodating cavity as possible. Therefore, in order to facilitate positioning, the first limiting rib 121 and the third limiting rib 14 are generally provided at the end of the accommodating cavity. In this case, if the third limiting rib 14 is provided between the two first limiting ribs 121, in order to leave space between the two first limiting ribs 121 to accommodate the first protruding structure 32, the thickness of the third limiting rib 14 in the axial direction of the housing 1 is generally less than the thickness of the first limiting rib 121. When the positions of the first limiting rib 121 and the third limiting rib 14 can be set arbitrarily, the thickness of the first limiting rib 121 and the third limiting rib 14 is not subject to the above-mentioned restrictions.
[0035] In one embodiment, in order to ensure the abutment strength between the first protruding structure 32 and the third limiting rib 14 and balance the force on the abutment surface between the first protruding structure 32 and the third limiting rib 14, surface contact is adopted between the first protruding structure 32 and the third limiting rib 14, and the contact surface can be a plane or a curved surface, or multiple contact surfaces can be set.
[0036] In order to improve the fixing strength of the stator core 2, the limiting structure 12, the third limiting rib 14 and the first protruding structure 32 are provided in plurality, and specifically two can be provided respectively. When the limiting structure 12, the third limiting rib 14 and the first protruding structure 32 are symmetrically arranged respectively, a relatively stable fixing effect can be achieved on the stator core 2.
[0037] Since the shape of the cover 5 is generally concave, it is difficult for the inner wall of its end to directly abut against the second winding frame 4. Considering this situation, in one embodiment, as shown in FIG. Figure 6 and Figure 8 As shown, the cover 5 includes a cover body 51 and a fourth limiting rib 52, the fourth limiting rib 52 is arranged on the inner wall of the cover body 51, and the fourth limiting rib 52 abuts against the second winding frame 4 in the axial direction of the stator core 2. The fourth limiting rib 52 can be directly formed on the inner wall of the cover 5 by injection molding, or fixed to the inner wall of the cover 5 by bonding, bolting, etc.
[0038] Furthermore, the second winding frame 4 includes a second winding frame body 41 and a second protruding structure 42, the second protruding structure 42 is provided on the second winding frame body 41 and protrudes axially or radially from the second winding frame body 41, the second protruding structure 42 can be configured as a plate or a block, and a plurality of fourth limiting ribs 52 are provided, and at least part of the fourth limiting ribs 52 abuts against the second protruding structure 42 in the axial direction of the stator core 2. Since the second winding frame body 41 and the second protruding structure 42 are different in size and shape, in order to enable each fourth limiting rib 52 to abut against the second winding frame body 41 or the second protruding structure 42, the length of each fourth limiting rib 52 in the axial direction of the cover body 5 generally differs.
[0039] It should be noted that in actual use, due to manufacturing and installation processes and other factors such as heat dissipation, after the motor is assembled, a certain gap may be left between the fourth limiting rib 52 and the second winding frame body 41 and the second protruding structure 42, and the gap is controlled to be less than 0.3 mm.
[0040] In one embodiment, the cover body 5 can be fixed to the shell 1 by screws 6. Specifically, a threaded sleeve 15 is provided on the shell body 11, and the inner wall of the threaded sleeve 15 is provided with an internal thread. A threaded hole 53 is axially provided on the cover body 51, and the screws 6 are threadedly connected in the threaded sleeve 15 and the threaded hole 53.
[0041] Furthermore, the threaded sleeve 15 can be embedded in the shell wall of the shell body 11 by injection molding, and the outer wall of the threaded sleeve 15 is provided with an external thread to enhance the connection strength between the threaded sleeve 15 and the shell body 11 and prevent the threaded sleeve 15 from sliding.
[0042] Another embodiment of the present invention further provides a motor, which includes the stator fixing structure in any of the above embodiments and other components such as a rotor.
[0043] Another embodiment of the present invention provides an electric tool, which includes the above-mentioned motor and other components.
[0044] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.
[0045] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A stator fixing structure, characterized in that: include: A shell (1) comprises a shell body (11), a limiting structure (12) and a plurality of second limiting convex ribs (13); one end of the shell body (11) is provided with an opening; the limiting structure (12) and the plurality of second limiting convex ribs (13) are arranged on the circumferential inner wall of the shell body (11) and are located inside the shell body (11); A stator core (2) is arranged in the housing body (11); A first winding frame (3) is sleeved on one end of the stator core (2), the first winding frame (3) comprising a first winding frame body (31) and a first protruding structure (32), the first protruding structure (32) cooperates with the limiting structure (12) and is arranged on the first winding frame body (31) and protrudes axially and / or radially from the first winding frame body (31); A second winding frame (4) is sleeved on the other end of the stator core (2); and A cover body (5) mounted on the opening of the housing body (11); The first winding frame (3) is abutted against the inside of the housing (1) in the axial direction of the stator core (2), the inner side of the cover body (5) is abutted against the second winding frame (4) in the axial direction of the stator core (2), and a plurality of the second limiting ribs (13) are abutted against the stator core (2) in the circumferential direction of the stator core (2) and are interference fit therewith.
2. The stator fixing structure according to claim 1, characterized in that: The housing (1) further comprises a third limiting rib (14) provided on the inner wall of the housing body (11), wherein the third limiting rib (14) abuts against the first winding frame (3) in the axial direction of the stator core (2).
3. The stator fixing structure according to claim 2, characterized in that: The limiting structure (12) comprises two first limiting ribs (121) arranged at intervals, the two first limiting ribs (121) being respectively clamped on both sides of the first protruding structure (32) in the circumferential direction of the stator core (2), the third limiting rib (14) being arranged between the two first limiting ribs (121), and the third limiting rib (14) being in abutment with the first protruding structure (32) in the axial direction of the stator core (2).
4. The stator fixing structure according to claim 3, characterized in that: The first protruding structure (32) and the third limiting rib (14) are in surface contact.
5. The stator fixing structure according to claim 1, characterized in that: The cover body (5) comprises a cover body main body (51) and a fourth limiting convex rib (52), wherein the fourth limiting convex rib (52) is arranged on the inner wall of the cover body main body (51), and the fourth limiting convex rib (52) abuts against the second winding frame (4) in the axial direction of the stator core (2).
6. The stator fixing structure according to claim 5, characterized in that: The second winding frame (4) comprises a second winding frame body (41) and a second protruding structure (42), wherein the second protruding structure (42) is arranged on the second winding frame body (41) and protrudes axially or radially from the second winding frame body (41), and a plurality of fourth limiting ribs (52) are provided, and at least part of the fourth limiting ribs (52) abut against the second protruding structure (42) in the axial direction of the stator core (2).
7. The stator fixing structure according to claim 5, characterized in that: The shell body (11) is provided with a threaded sleeve (15), the inner wall of the threaded sleeve (15) is provided with an internal thread, the cover body (51) is axially provided with a threaded hole (53), and a screw (6) is connected inside the threaded hole (53) and the threaded sleeve (15).
8. The stator fixing structure according to claim 7, characterized in that: The threaded sleeve (15) is embedded in the housing body (11) by injection molding, and the outer wall of the threaded sleeve (15) is provided with external threads.
9. A motor, characterized in that: It comprises the stator fixing structure according to any one of claims 1 to 8.
10. An electric tool, characterized in that: Comprising the motor as claimed in claim 9.