Driving plate is built in the outer rotor brushless motor of stator core inner hole place

Abstract

The utility model discloses the outer rotor brushless motor of drive board built -in in the hole of stator core, relates to motor design field, including bottom and rotating lid, the rotating lid is fixedly installed with permanent magnet ring in, the middle portion of bottom is shaped with round hole, and the fixedly installed with location support in round hole, and the middle portion of location support is shaped with rotating hole, and the middle portion fixed mounting of rotating lid in -side has the shaft, and the shaft rotation cooperation installs in rotating hole, the drive board is fixedly installed on location support, and the iron core is installed with the sleeve setting on location support, and the drive board sets up in the inboard of iron core, and the iron core clearance fit installs in permanent magnet ring, the utility model discloses the drive board built -in in the iron core of stator, can exclude the occupation height of drive board, and then make the whole brushless motor more short, can be convenient for installation and use, realize the miniaturization of brushless motor product, when soaking in water, can not directly soak to drive board, can therefore have better waterproof performance.

Description

Technical Field

[0001] This utility model relates to the field of motor design, and in particular to an external rotor brushless motor in which the drive board is built into the inner hole of the stator core. Background Technology

[0002] An external rotor brushless DC motor is a unique type of brushless motor with its stator located at the center of the motor and the rotor encased outside the stator. This design offers significant advantages over traditional internal rotor motors, including higher torque density and better heat dissipation, making it widely used in drones, electric bicycles, model airplanes, and fans.

[0003] A novel external rotor brushless DC motor is disclosed in the prior art (Announcement No.: CN222884464U, Announcement Date: 2025.05.16). This motor employs two bearings of identical dimensions and inserts an anti-vibration positioning component between the bearing and the inner wall of the bushing, achieving rapid bearing fixation through an interference fit. This design reduces bearing loosening, lowers vibration and noise, and simplifies the bearing disassembly, assembly, and replacement process.

[0004] However, in the above-mentioned solutions and existing brushless motors, the internal drive board (PCBA) is directly fixed to the top or bottom of the stator core. This mounting structure has the following drawbacks:

[0005] 1. The height of the brushless motor will inevitably increase, making it inconvenient for customers to install and use;

[0006] 2. When immersed in water, the drive board will be submerged, which is not conducive to the overall waterproofing of the brushless motor.

[0007] Therefore, it is necessary to design an external rotor brushless motor with the drive board built into the inner hole of the stator core. Utility Model Content

[0008] To overcome the shortcomings mentioned above, this utility model provides a technical solution that can solve the above problems.

[0009] The external rotor brushless motor with the drive plate built into the inner hole of the stator core includes a bottom cover and a rotating cover, and a permanent magnet ring is fixedly installed in the rotating cover;

[0010] A circular hole is formed in the center of the bottom cover, and a positioning bracket is fixedly installed in the circular hole. A rotating hole is formed in the center of the positioning bracket, and a rotating shaft is fixedly installed in the center of the inner side of the rotating cover. The rotating shaft is rotatably fitted in the rotating hole.

[0011] A drive plate is fixedly installed on the positioning bracket, and an iron core is sleeved on the positioning bracket. The drive plate is located inside the iron core, and the iron core is fitted into the permanent magnet ring with a clearance fit.

[0012] Furthermore: a copper wire winding is wound and installed on the iron core, and the drive plate and the copper wire winding are electrically connected to each other. Both the iron core and the copper wire winding are located inside the permanent magnet ring.

[0013] Furthermore: a sealing groove is formed inside the circular hole, and a sealing ring is installed in the sealing groove with a clearance fit. The sealing ring is pressed between the positioning bracket and the bottom cover for installation and fixation.

[0014] Furthermore, two rolling bearings are fitted inside the rotating hole with a clearance fit, and the rotating shaft is inserted and fitted into the inner ring of the two rolling bearings.

[0015] Furthermore, a limiting ring is formed in the middle of the rotating hole, and the limiting ring is located between the two rolling bearings.

[0016] Furthermore: both the positioning bracket and the drive plate are circular in structure, and a positioning hole is formed in the middle of the iron core. The positioning bracket and the drive plate are both installed in the positioning hole of the iron core with clearance fit.

[0017] Furthermore: both the positioning bracket and the drive plate have a limiting edge formed on their outer sides, and the positioning hole of the iron core has a limiting groove formed inside, with the limiting edge being inserted into the limiting groove with a clearance fit.

[0018] Furthermore, the drive board is fixedly mounted on the positioning bracket by screws.

[0019] Furthermore: the positioning bracket is formed with a plurality of first threaded holes, and the plurality of first screw holes are arranged in a circular array with each other; the drive plate is formed with a plurality of second threaded holes, and the second threaded holes are respectively positioned above the first threaded holes; a plurality of screws are provided for mounting the drive plate, and the screws are respectively locked through the second threaded holes and the first threaded holes.

[0020] Furthermore, the positioning bracket is formed with multiple weight-reducing holes, which are arranged in a circular array on the outside of the rotating hole.

[0021] Compared with the prior art, the beneficial effects of this utility model are: by embedding the drive board inside the stator core, the height occupied by the drive board can be eliminated, thereby making the entire brushless motor shorter, which facilitates installation and use, realizes the miniaturization of brushless motor products, and at the same time, the drive board will not be directly immersed in water when submerged, thus having better waterproof performance.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] 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 these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 yes Figure 1 A structural diagram from another perspective;

[0026] Figure 3 This is an exploded structural diagram of the present invention;

[0027] Figure 4 yes Figure 3 A structural diagram from another perspective.

[0028] The figure shows: 1. Bottom cover; 2. Rotating cover; 3. Permanent magnet ring; 4. Round hole; 5. Positioning bracket; 6. Rotating hole; 7. Rotating shaft; 8. Drive plate; 9. Iron core; 10. Sealing groove; 11. Sealing ring; 12. Rolling bearing; 13. Limiting ring; 14. Positioning hole; 15. Limiting edge; 16. Limiting groove; 17. First threaded hole; 18. Second threaded hole; 19. Weight reduction hole. Detailed Implementation

[0029] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0030] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0031] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] like Figure 1-4 As shown, this utility model discloses an external rotor brushless motor with the drive plate built into the inner hole of the stator core, including a bottom cover 1 and a rotating cover 2, wherein a permanent magnet ring 3 is fixedly installed inside the rotating cover 2;

[0035] A circular hole 4 is formed in the center of the bottom cover 1. A positioning bracket 5 is fixedly installed in the circular hole 4. A rotating hole 6 is formed in the center of the positioning bracket 5. A rotating shaft 7 is fixedly installed in the center of the inner side of the rotating cover 2. The rotating shaft 7 is rotatably fitted in the rotating hole 6.

[0036] A drive plate 8 is fixedly installed on the positioning bracket 5, and an iron core 9 is sleeved on the positioning bracket 5. The drive plate 8 is located inside the iron core 9, and the iron core 9 is installed in the permanent magnet ring 3 with clearance fit.

[0037] The principle is as follows: increasing the diameter of the inner circle of the iron core 9 allows the drive board 8 to be directly installed into the iron core 9 without any height overlap, while also improving the sealing of the drive board 8 and effectively enhancing its waterproof performance; the drive board 8 is directly fixed to the positioning bracket 5, and the positioning bracket 5 and the drive board 8 are both built into the iron core 9, thus effectively utilizing the space of the brushless motor, thereby making the brushless motor shorter and achieving a miniaturized design.

[0038] Furthermore: a copper wire winding (not shown) is wound and installed on the iron core 9. The drive plate 8 and the copper wire winding are electrically connected to each other. Both the iron core 9 and the copper wire winding are located inside the permanent magnet ring 3. When the copper wire winding is energized, the electric current will form a magnetic field around the iron core 9. The drive plate 8 is then used to commutate the magnetic field. The magnetic force of the permanent magnet ring 3 drives the entire rotating cover 2 to rotate at high speed, which is the same as the driving principle of existing brushless motors. This utility model integrates the drive plate 8 into the iron core 9, thereby reducing the height of the brushless motor and realizing a miniaturized motor design.

[0039] Furthermore: a sealing groove 10 is formed inside the circular hole 4, and a sealing ring 11 is installed in the sealing groove 10 with clearance fit. The sealing ring 11 is pressed between the positioning bracket 5 and the bottom cover 1 for installation and fixation. The sealing ring 11 can be used to ensure the sealing between the positioning bracket 5 and the bottom cover 1, thereby enhancing the waterproof performance of the brushless motor.

[0040] Furthermore, two rolling bearings 12 are fitted inside the rotating hole 6 with a clearance fit, and the rotating shaft 7 is inserted and fitted into the inner ring of the two rolling bearings 12; this makes the rotation of the rotating shaft 7 more stable and smooth, and its rotational resistance is smaller.

[0041] Furthermore, a limiting ring 13 is formed in the middle of the rotating hole 6, and the limiting ring 13 is located between the two rolling bearings 12; the two rolling bearings 12 can be separated to achieve stable assembly of the rolling bearings 12, and the two rolling bearings 12 do not interfere with each other.

[0042] Furthermore, both the positioning bracket 5 and the drive plate 8 are circular structures, and a positioning hole 14 is formed in the middle of the iron core 9. The positioning bracket 5 and the drive plate 8 are both installed in the positioning hole 14 of the iron core 9 with clearance fit. This can ensure a stable fit between the iron core 9 and the positioning bracket 5, and at the same time ensure that the drive plate 8 can be stably built into the positioning hole 14 of the iron core 9, realizing the technical solution of the built-in drive plate 8 and reducing the overall design height of the brushless motor.

[0043] Furthermore, the positioning bracket 5 and the drive plate 8 are both formed with limiting edges 15 on their outer sides, and the positioning hole 14 of the iron core 9 is formed with a limiting groove 16, and the limiting edge 15 is inserted into the limiting groove 16 with a clearance fit; so that the iron core 9 will not rotate after installation, the installation stability is higher, and the brushless motor is less likely to be damaged.

[0044] Furthermore, the drive board 8 is fixedly mounted on the positioning bracket 5 with screws, making the installation of the drive board 8 more stable and less prone to loosening, thus improving the service life of the entire brushless motor.

[0045] Furthermore: the positioning bracket 5 has multiple first threaded holes 17 formed on it, and the multiple first screw holes are arranged in a circular array. The drive plate 8 has multiple second threaded holes 18 formed on it, and the second threaded holes 18 are arranged one-to-one above the first threaded holes 17. Multiple screws are provided for installing the drive plate 8, and the screws pass through the second threaded holes 18 and the first threaded holes 17 respectively to lock them. The screws are screwed through the threaded holes to lock them, and the multiple threaded holes are arranged in a circular array, so the stability of the drive plate 8 installation can be further enhanced, and the situation of one side warping will not occur.

[0046] Furthermore, the positioning bracket 5 is formed with multiple weight-reducing holes 19, which are arranged in a circular array on the outside of the rotating hole 6. This can effectively reduce the overall weight of the brushless motor. At the same time, the electronic components on the drive board 8 can be fitted into the weight-reducing holes 19 to achieve effective coverage and shielding. This can effectively utilize the space of the brushless motor and also ensure the service life of the brushless motor.

[0047] This embodiment does not impose any limitation on the shape, material, structure, etc. of this utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. An external rotor brushless motor with the drive plate built into the inner hole of the stator core, including a bottom cover and a rotating cover, wherein a permanent magnet ring is fixedly installed inside the rotating cover; Its features are: A circular hole is formed in the center of the bottom cover, and a positioning bracket is fixedly installed in the circular hole. A rotating hole is formed in the center of the positioning bracket, and a rotating shaft is fixedly installed in the center of the inner side of the rotating cover. The rotating shaft is rotatably fitted in the rotating hole. A drive plate is fixedly installed on the positioning bracket, and an iron core is sleeved on the positioning bracket. The drive plate is located inside the iron core, and the iron core is fitted into the permanent magnet ring with a clearance fit.

2. The external rotor brushless motor with the drive board built into the inner hole of the stator core according to claim 1, characterized in that: A copper wire winding is wound around the iron core, and the drive plate and the copper wire winding are electrically connected to each other. Both the iron core and the copper wire winding are located inside the permanent magnet ring.

3. The external rotor brushless motor with the drive board built into the inner hole of the stator core according to any one of claims 1 or 2, characterized in that: A sealing groove is formed inside the circular hole, and a sealing ring is installed in the sealing groove with a clearance fit. The sealing ring is pressed between the positioning bracket and the bottom cover for installation and fixation.

4. The external rotor brushless motor with the drive board built into the inner hole of the stator core according to claim 1, characterized in that: Two rolling bearings are installed in the rotating hole with clearance fit, and the rotating shaft is installed in the inner ring of the two rolling bearings with insertion fit.

5. The external rotor brushless motor with the drive board built into the inner hole of the stator core according to claim 4, characterized in that: A limiting ring is formed in the middle of the rotating hole, and the limiting ring is located between two rolling bearings.

6. The external rotor brushless motor with the drive board built into the inner hole of the stator core according to claim 1, characterized in that: Both the positioning bracket and the drive plate are circular in shape, and a positioning hole is formed in the middle of the iron core. The positioning bracket and the drive plate are both installed in the positioning hole of the iron core with clearance fit.

7. The external rotor brushless motor with the drive board built into the inner hole of the stator core according to claim 6, characterized in that: The positioning bracket and the drive plate are both formed with limiting edges on their outer sides, and the positioning holes of the iron core are formed with limiting grooves, with the limiting edges being inserted into the limiting grooves with clearance fit.

8. The external rotor brushless motor with the drive board built into the inner hole of the stator core according to claim 1, characterized in that: The drive board is fixedly mounted on the positioning bracket with screws.

9. The external rotor brushless motor with the drive board built into the inner hole of the stator core according to claim 8, characterized in that: The positioning bracket has multiple first threaded holes formed on it, and the multiple first screw holes are arranged in a circular array with each other. The drive plate has multiple second threaded holes formed on it, and the second threaded holes are arranged one-to-one above the first threaded holes. Multiple screws are provided for mounting the drive plate, and the screws pass through the second threaded holes and the first threaded holes to lock them in place.

10. The external rotor brushless motor with the drive board built into the inner hole of the stator core according to claim 1, characterized in that: The positioning bracket has multiple weight-reducing holes formed on it, and the multiple weight-reducing holes are arranged in a circular array on the outside of the rotating hole.

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