An outer rotor forming magnetic steel fixing tool

Abstract

The utility model discloses a kind of magnetic steel fixing tool for outer rotor forming, including the upper tooling unit and lower tooling unit being respectively located on the upper and lower end of outer rotor shell injection mold and being connected with its fixed connection, wherein, the lower end of upper tooling unit is equipped with several first positioning convex teeth in interval distribution, each first positioning convex tooth is contacted with the upper end face of permanent magnet magnetic steel located in outer rotor shell injection mold corresponding;The upper end of lower tooling unit is equipped with several second positioning convex teeth in interval distribution, each second positioning convex tooth is contacted with the lower end face of permanent magnet magnetic steel corresponding;Permanent magnet magnetic steel located in outer rotor shell injection mold is formed reliable axial positioning effect by first positioning convex tooth and second positioning convex tooth;The utility model can provide reliable axial support positioning effect for the permanent magnet magnetic steel of outer rotor shell and injection mold, guarantee the injection quality of permanent magnet magnetic steel on outer rotor shell.

Description

Technical Field

[0001] This utility model belongs to the field of motor structure, specifically relating to a magnet fixing fixture for forming an external rotor. Background Technology

[0002] With the widespread application of external rotor direct drive motors, the processing and manufacturing performance of external rotor motors is receiving increasing attention. Specifically, external rotor motors typically require multiple permanent magnets to be installed on the yoke of their external rotor housing. Current technology usually involves manually pasting the permanent magnets onto the rotor housing yoke, which is inefficient and time-consuming.

[0003] Some technologies directly injection mold the outer rotor housing, rotor housing yoke, and permanent magnets as a single unit, with the rotor housing yoke and permanent magnets integrally embedded in the injection-molded outer rotor housing. However, in actual injection molding operations, due to the small size and large number of permanent magnets, there is a lack of reliable axial support and positioning between the permanent magnets, rotor housing yoke, and injection mold before injection begins. This can easily lead to uncontrollable axial displacement of the permanent magnets, which in turn affects the injection molding effect of the permanent magnets on the outer rotor housing, potentially impacting the working performance of the outer rotor motor.

[0004] Therefore, the applicant seeks technical solutions to improve the aforementioned technical problems. Summary of the Invention

[0005] In view of this, the purpose of this utility model is to propose a magnet fixing fixture for forming an outer rotor, which can provide reliable axial support and positioning for the permanent magnet of the outer rotor housing and the injection mold, and ensure the injection molding quality of the permanent magnet on the outer rotor housing.

[0006] Therefore, the technical solution adopted by this utility model is as follows:

[0007] A magnet fixing fixture for forming an outer rotor, the outer rotor comprising an injection-molded outer rotor housing, an outer rotor yoke and a plurality of permanent magnets being injection-molded and embedded in the outer rotor housing, comprising an upper fixture unit and a lower fixture unit respectively located at the upper and lower ends of the injection mold of the outer rotor housing and fixedly connected thereto, wherein...

[0008] The lower end of the upper tooling unit is provided with a plurality of first positioning protrusions that are spaced apart, and each first positioning protrusion is in contact with the upper end face of the permanent magnet located in the injection mold of the outer rotor housing.

[0009] The upper end of the lower tooling unit is provided with a plurality of second positioning protrusions that are spaced apart, and each second positioning protrusion is in contact with the lower end face of the permanent magnet.

[0010] The first and second positioning teeth form a reliable axial positioning effect for the permanent magnet located in the injection mold of the outer rotor housing.

[0011] Preferably, the upper end face of each permanent magnet corresponds to two first positioning protrusions, and the lower end face corresponds to two second positioning protrusions.

[0012] Preferably, the number of permanent magnets is 24-60.

[0013] Preferably, the lower end of the upper tooling unit is provided with a plurality of third positioning protrusions distributed at intervals, and each third positioning protrusion is in contact with the upper end face of the outer rotor yoke located in the injection mold of the outer rotor housing.

[0014] Preferably, the third positioning tooth is located on the outer periphery of the first positioning tooth, and the length of the third positioning tooth is greater than the length of the first positioning tooth.

[0015] Preferably, at least two first positioning protrusions are distributed between adjacent third positioning protrusions.

[0016] Preferably, the upper end of the lower tooling unit is provided with a plurality of fourth positioning protrusions distributed at intervals, and each fourth positioning protrusion corresponds to and contacts the lower end face of the outer rotor yoke located in the injection mold of the outer rotor housing; the third positioning protrusion and the fourth positioning protrusion form a reliable axial positioning effect on the outer rotor yoke located in the injection mold of the outer rotor housing.

[0017] Preferably, the fourth positioning tooth is located on the outer periphery of the second positioning tooth, and the length of the fourth positioning tooth is greater than the length of the second positioning tooth.

[0018] Preferably, at least two second positioning protrusions are distributed between adjacent fourth positioning protrusions.

[0019] Preferably, the outer rotor housing is provided with a plurality of circumferentially spaced magnet intervals; the permanent magnet is located in its corresponding magnet interval.

[0020] This utility model proposes a magnet fixing fixture structure for outer rotor molding, consisting of an upper tooling unit and a lower tooling unit located at the upper and lower ends of the outer rotor housing injection mold and fixedly connected thereto. A plurality of spaced-apart first positioning protrusions are provided at the lower end of the upper tooling unit, each first positioning protrusion corresponding to and contacting the upper end face of the permanent magnet located within the outer rotor housing injection mold. Simultaneously, a plurality of spaced-apart second positioning protrusions are provided at the upper end of the lower tooling unit, each second positioning protrusion corresponding to and contacting the lower end face of the permanent magnet. Through the first and second positioning protrusions, a reliable axial positioning effect is achieved for the permanent magnet located within the outer rotor housing injection mold. Before injection molding begins, this application can provide reliable axial support and positioning for the permanent magnet and the injection mold, ensuring the injection molding quality of the permanent magnet on the outer rotor housing. Attached Figure Description

[0021] Figure 1 This is an exploded structural diagram of the magnet fixing tool for forming the outer rotor, the yoke of the outer rotor, and the permanent magnet in a specific embodiment of this application.

[0022] Figure 2 yes Figure 1 Schematic diagram of the structure of the upper and middle tooling unit 4;

[0023] Figure 3 yes Figure 1 Schematic diagram of the structure of the lower tooling unit 5;

[0024] Figure 4 This is a schematic diagram of the state structure of the magnet fixing tool for the outer rotor molding after injection molding is completed, according to a specific embodiment of this application. Detailed Implementation

[0025] This utility model discloses a magnet fixing fixture for forming an outer rotor. The outer rotor includes an injection-molded outer rotor housing. An outer rotor yoke and several permanent magnets are embedded in the outer rotor housing by injection molding. The fixture includes an upper fixture unit and a lower fixture unit located at the upper and lower ends of the injection mold of the outer rotor housing and fixedly connected thereto. The lower end of the upper fixture unit is provided with several spaced-apart first positioning protrusions, each of which corresponds to and contacts the upper end face of the permanent magnet located in the injection mold of the outer rotor housing. The upper end of the lower fixture unit is provided with several spaced-apart second positioning protrusions, each of which corresponds to and contacts the lower end face of the permanent magnet. The first and second positioning protrusions form a reliable axial positioning effect for the permanent magnet located in the injection mold of the outer rotor housing.

[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 recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a magnet fixing fixture for forming an outer rotor includes an injection-molded outer rotor housing 1. An outer rotor yoke 2 and several permanent magnets 3 are injection-molded and embedded on the outer rotor housing 1. The fixture includes an upper fixture unit 4 and a lower fixture unit 5, respectively located at the upper and lower ends of the outer rotor housing injection mold (not shown in the figure, designed to correspond to the shape of the outer rotor housing 1) and fixedly connected thereto. The lower end of the upper fixture unit 4 is provided with several spaced-apart first positioning protrusions 41. Each first positioning protrusion 41 is positioned at the upper and lower ends of the outer rotor housing injection mold. The upper end face 3a of the permanent magnet in the mold is in contact with the mold; the upper end of the lower tooling unit 5 is provided with a plurality of second positioning protrusions 51 distributed at intervals, and each second positioning protrusion 51 is in contact with the lower end face 3b of the permanent magnet; the first positioning protrusion 41 and the second positioning protrusion 51 form a reliable axial positioning effect on the permanent magnet 3 located in the injection mold of the outer rotor housing; preferably, in this embodiment, the number of permanent magnets 3 is 24-60, and more preferably, in this embodiment, the number of permanent magnets 3 is 48.

[0028] Preferably, in order to further facilitate a reliable axial positioning effect, in this embodiment, the upper end face 3a of each permanent magnet 3 corresponds to two first positioning protrusions 41, and its lower end face 3b corresponds to two second positioning protrusions 51.

[0029] To further ensure the injection molding quality of the permanent magnet 3, this embodiment also proposes to provide an axial positioning effect for the outer rotor yoke 2 that contacts the permanent magnet 3. Preferably, in this embodiment, the lower end of the upper tooling unit 4 is provided with a plurality of spaced third positioning protrusions 42, each of which is in corresponding contact with the upper end face 2a of the outer rotor yoke located in the injection mold of the outer rotor housing. More preferably, in this embodiment, the upper end of the lower tooling unit 5 is provided with a plurality of spaced fourth positioning protrusions 52, each of which is in corresponding contact with the lower end face 2b of the outer rotor yoke located in the injection mold of the outer rotor housing. The third positioning protrusions 42 and the fourth positioning protrusions 52 form a reliable axial positioning effect for the outer rotor yoke 2 located in the injection mold of the outer rotor housing.

[0030] Preferably, in this embodiment, the third positioning tooth 42 is located on the outer periphery of the first positioning tooth 41, and the length of the third positioning tooth 42 is greater than the length of the first positioning tooth 41; the fourth positioning tooth 52 is located on the outer periphery of the second positioning tooth 51, and the length of the fourth positioning tooth 52 is greater than the length of the second positioning tooth 51; more specifically, the length of the third positioning tooth 42 is equal to the length of the fourth positioning tooth 52, and the length of the second positioning tooth 51 is equal to the length of the first positioning tooth 41.

[0031] Preferably, in this embodiment, at least two first positioning teeth 41 are distributed between adjacent third positioning teeth 42; at least two second positioning teeth 51 are distributed between adjacent fourth positioning teeth 52; more specifically, in this embodiment, four first positioning teeth 41 are distributed between adjacent third positioning teeth 42; and four second positioning teeth 51 are distributed between adjacent fourth positioning teeth 52.

[0032] Preferably, in this embodiment, the outer rotor housing 1 is provided with a plurality of circumferentially spaced magnet spacers 1a; the permanent magnet 3 is located in its corresponding magnet spacer 1a, providing a reliable circumferential positioning effect for the permanent magnet 3.

[0033] This embodiment proposes a magnet fixing fixture structure for outer rotor molding, consisting of an upper tooling unit 4 and a lower tooling unit 5 located at the upper and lower ends of the outer rotor housing injection mold and fixedly connected thereto. Several spaced-apart first positioning protrusions 41 are provided at the lower end of the upper tooling unit 4, each first positioning protrusion 41 corresponding to the upper end face 3a of the permanent magnet located in the outer rotor housing injection mold. Simultaneously, several spaced-apart second positioning protrusions 51 are provided at the upper end of the lower tooling unit 5, each second positioning protrusion 51 corresponding to the lower end face 3b of the permanent magnet. The first positioning protrusions 41 and second positioning protrusions 51 provide a reliable axial positioning effect for the permanent magnet 3 located in the outer rotor housing injection mold. Before injection molding begins, this embodiment can provide reliable axial support and positioning for the permanent magnet 3 and the injection mold, ensuring the injection molding quality of the permanent magnet 3 on the outer rotor housing 1.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A magnet fixing fixture for forming an outer rotor, the outer rotor comprising an injection-molded outer rotor housing, wherein an outer rotor yoke and a plurality of permanent magnets are injection-molded and embedded in the outer rotor housing, characterized in that, This includes an upper tooling unit and a lower tooling unit located at the upper and lower ends of the injection mold for the outer rotor housing, respectively, and fixedly connected to it. The lower end of the upper tooling unit is provided with a plurality of first positioning protrusions that are spaced apart, and each first positioning protrusion is in contact with the upper end face of the permanent magnet located in the injection mold of the outer rotor housing. The upper end of the lower tooling unit is provided with a plurality of second positioning protrusions that are spaced apart, and each second positioning protrusion is in contact with the lower end face of the permanent magnet. The first and second positioning teeth form a reliable axial positioning effect for the permanent magnet located in the injection mold of the outer rotor housing.

2. The magnet fixing fixture for forming the outer rotor according to claim 1, characterized in that, Each permanent magnet has two first positioning teeth on its upper end face and two second positioning teeth on its lower end face.

3. The magnet fixing fixture for forming the outer rotor according to claim 1 or 2, characterized in that, The number of permanent magnets is 24-60.

4. The magnet fixing fixture for forming the outer rotor according to claim 1, characterized in that, The lower end of the upper tooling unit is provided with a number of third positioning protrusions that are spaced apart, and each third positioning protrusion is in contact with the upper end face of the outer rotor yoke located in the injection mold of the outer rotor housing.

5. The magnet fixing fixture for forming the outer rotor according to claim 4, characterized in that, The third positioning tooth is located on the outer periphery of the first positioning tooth, and the length of the third positioning tooth is greater than the length of the first positioning tooth.

6. The magnet fixing fixture for forming the outer rotor according to claim 5, characterized in that, At least two first positioning teeth are distributed between adjacent third positioning teeth.

7. The magnet fixing fixture for forming the outer rotor according to claim 4, characterized in that, The upper end of the lower tooling unit is provided with a number of fourth positioning protrusions that are spaced apart. Each fourth positioning protrusion is in contact with the lower end face of the outer rotor yoke located in the injection mold of the outer rotor housing. The third and fourth positioning protrusions form a reliable axial positioning effect on the outer rotor yoke located in the injection mold of the outer rotor housing.

8. The magnet fixing fixture for forming the outer rotor according to claim 7, characterized in that, The fourth positioning tooth is located on the outer periphery of the second positioning tooth, and the length of the fourth positioning tooth is greater than the length of the second positioning tooth.

9. The magnet fixing fixture for forming the outer rotor according to claim 8, characterized in that, There are at least two second positioning protrusions distributed between adjacent fourth positioning protrusions.

10. The magnet fixing fixture for forming the outer rotor according to claim 1, characterized in that, The outer rotor housing is provided with several circumferentially spaced magnet intervals; the permanent magnet is located in its corresponding magnet interval.

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