CN212784934U - Brushless motor external rotor assembly - Google Patents
Brushless motor external rotor assembly Download PDFInfo
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- CN212784934U CN212784934U CN202021746394.2U CN202021746394U CN212784934U CN 212784934 U CN212784934 U CN 212784934U CN 202021746394 U CN202021746394 U CN 202021746394U CN 212784934 U CN212784934 U CN 212784934U
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Abstract
The utility model discloses a brushless motor external rotor assembly, including casing magnetic conductive ring, pivot, magnet steel locating rack and a plurality of magnet steel, the magnetic conductive ring nestification is fixed and is surveyed outside the magnet steel locating rack, and the magnet steel locating rack is the injection molding, and the magnet steel locating rack is a tubular structure, and the magnet steel interval sets up on the inner peripheral surface of magnet steel locating rack, and the bottom of magnet steel locating rack is equipped with the end plate, is equipped with the turbofan blade that is radial distribution's involute form on the interior terminal surface of end plate, and the end plate is equipped with the louvre all around, the pivot with end plate fixed connection, the pivot with the central coaxial setting of magnet steel locating rack. The brushless motor outer rotor assembly has a good heat dissipation effect; the problem of the end face and radial runout of the rotor can be solved, the dynamic balance problem can be solved by adopting a weighting mode, and the production efficiency can be effectively improved; the magnetic steel positioning frame of the brushless motor outer rotor assembly adopts injection molding parts, only a few metal parts are used, and the whole rotor structure is light in weight, so that the advantage of light weight of a product is enhanced; and the magnetic steel does not need glue for bonding, so the magnetic steel has the characteristics of environmental protection and safety.
Description
Technical Field
The utility model relates to the technical field of electric machines, in particular to brushless motor external rotor assembly.
Background
The existing motor outer rotor component mainly comprises a motor shell, a rotating shaft and magnetic steel arranged in the motor shell, wherein the magnetic steel is generally directly adhered to the inner circumferential surface of the motor shell through glue, a shaft hole is formed in the bottom of the motor shell, and the rotating shaft is in interference fit with the shaft hole in the motor shell of the motor shell. The existing motor outer rotor component has the following defects: 1) the connecting surface of the joint of the motor shell and the rotating shaft adopts a stretching process, so that the contact area is small, the dynamic balance, the end surface and the radial run-out of the product are poor, and the reject ratio of the product is high; 2) in order to improve the dynamic balance of a patent rotor, the conventional outer rotor of the motor usually adopts a weight removing method, and the weight removing dynamic balance processing is carried out in a mode of cutting a motor shell, so that a magnetic circuit of the motor can be damaged, the magnetic circuit of the motor is deformed, and the noise and the performance of the motor are influenced; 3) the glue is adopted to fix the magnetic steel, the production cost is high, the production period is long, and the glue has volatile smell, so that the production environment is influenced, and even the body health of workers is influenced; 4) the existing motor outer rotor assembly usually adopts heat dissipation holes at the bottom of a motor shell to dissipate heat, so that the heat dissipation effect is poor, and the failure rate of a motor is increased. Aiming at the defects of the existing motor outer rotor component, the existing motor outer rotor component needs to be further improved.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the utility model aims to provide a brushless motor external rotor assembly with a novel structure.
In order to achieve the above objects and other related objects, the present invention provides a technical solution: the utility model provides a brushless motor external rotor assembly, includes magnetic conductive ring, pivot, magnet steel locating rack and a plurality of magnet steel, the magnet steel locating rack nestification is in the magnetic conductive ring, the magnet steel locating rack is the injection molding, the magnet steel locating rack is a tubular structure, the magnet steel interval is installed in corresponding caulking groove on the magnet steel locating rack, the bottom of magnet steel locating rack is equipped with the end plate, be equipped with the turbofan blade that is radial distribution on the inner terminal surface of end plate, the end plate is equipped with the louvre all around, the pivot with end plate fixed connection, the pivot with the central coaxial setting of magnet steel locating rack.
Preferably, the outer end face of the end plate is provided with a positioning boss, the rotating shaft penetrates through the positioning boss, and the rotating shaft is in interference fit with the positioning boss.
Preferably, the magnetic steel positioning frame is provided with a weighting balance clamping position for sticking balance mud.
Preferably, a magnetic steel positioning groove is formed in the inner peripheral surface of the magnetic steel positioning frame, and the magnetic steel is mounted in the magnetic steel positioning groove through a fixing mechanism.
Preferably, the fixing mechanism comprises an upper limiting block, a lower limiting block and elastic fasteners at two sides, which are arranged on the periphery of the positioning groove, and the magnetic steel is limited between the upper limiting block, the lower limiting block and the elastic fasteners.
Preferably, the end plate is connected with the magnetic steel positioning frame through the turbofan blade, and the heat dissipation holes are formed between the end plate and the magnetic steel positioning frame.
Preferably, the magnetic conductive ring is in interference fit with the magnetic steel positioning frame.
Preferably, the shape of the turbofan blade is an involute shape.
The technical scheme has the following beneficial effects: 1) the end plate of the magnetic steel positioning frame of the brushless motor outer rotor assembly is provided with the radially distributed turbofan blades, and when the rotor assembly rotates, the turbofan blades can generate strong airflow to remove heat outwards, so that the brushless motor outer rotor assembly has a better heat dissipation effect compared with a common brushless motor outer rotor; 2) the brushless motor outer rotor assembly is provided with a weighting balance clamping position on the magnetic steel positioning frame and used for pasting balance mud, the dynamic balance problem is solved by adopting a weighting method, a motor shell does not need to be cut to remove weight, and the performance of a motor is not influenced; 3) the magnetic steel positioning frame of the brushless motor outer rotor assembly is an injection molding piece, the outer end face of the end plate is provided with a positioning boss, and the positioning boss can be provided with an overlong height, so that the contact area between the positioning boss and the rotating shaft can be increased, the integral jumping after the positioning boss and the rotating shaft are pressed and mounted is ensured, and the product percent of pass is greatly improved; 4) the magnetic steel is fixed on the magnetic steel positioning frame by the fixing mechanism, and the bonding by glue is not needed, so that the production efficiency can be greatly improved, and meanwhile, the environmental pollution is prevented; 5) this brushless motor external rotor assembly magnet steel locating rack adopts the injection molding, only uses less metalwork, and whole rotor structure light in weight for product lightweight advantage reinforcing.
Drawings
Fig. 1 is a schematic perspective view of an embodiment of the present invention.
Fig. 2 is a front view of the embodiment of the present invention.
Fig. 3 is a schematic structural diagram (with the opening facing upward) of the magnetic steel positioning frame in the embodiment of the present invention.
Fig. 4 is a schematic structural diagram (with the opening facing downward) of the magnetic steel positioning frame in the embodiment of the present invention.
Element number description: 1. a magnetic conductive ring; 2. a magnetic steel positioning frame; 21. a turbofan blade; 22. an end plate; 23. positioning the boss; 24. heat dissipation holes; 25. a magnetic steel positioning groove; 26. an upper limit block; 27. a lower limiting block; 28. an elastic fastener; 29. a shaft hole; 3. a rotating shaft; 4. and (5) magnetic steel.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present invention.
As shown in fig. 1 and 2, the patent discloses a brushless motor outer rotor assembly, which includes a magnetic conductive ring 1, a magnetic steel positioning frame 2, a rotating shaft 3 and a plurality of magnetic steels 4, wherein the magnetic conductive ring 1 is a metal cylindrical structure, the magnetic steel positioning frame 2 is an injection molding part, the magnetic steel positioning frame 2 is also a cylindrical structure, the magnetic steel positioning frame 2 is nested in the magnetic conductive ring 1, the magnetic steel positioning frame 2 is fixedly connected with the magnetic conductive ring 1, the magnetic steel positioning frame 2 can be connected with the magnetic conductive ring 1 in an interference fit manner or in a glue bonding manner, and the magnetic conductive ring 1 is used as a magnetic conductive ring for a metal part. The inner peripheral surface of the magnetic steel positioning frame 2 is provided with caulking grooves arranged at intervals, the magnetic steels 4 are arranged in the caulking grooves on the inner peripheral surface of the magnetic steel positioning frame 2 at intervals, and the magnetic steels 4 can be arranged into magnetic steels with different polarities as required. The rotating shaft 3 is fixedly connected with the magnetic steel positioning frame 2, and the rotating shaft 3 is coaxially arranged with the magnetic conductive ring 1 and the magnetic steel positioning frame 2.
As shown in fig. 3 and 4, the bottom of the magnetic steel positioning frame 2 is provided with an end plate 22, and the inner end surface of the end plate 22 is provided with radially distributed turbofan blades 21, which are involute-shaped with a certain radian of the turbofan blades 21. The periphery of the end plate 22 is provided with heat dissipation holes, the end plate 22 is provided with a shaft hole 29, and the rotating shaft 3 penetrates through the shaft hole 29 and is fixedly connected with the end plate 22. Be equipped with location boss 23 on the outer terminal surface of end plate 22, because the magnet steel locating rack is the injection molding, therefore the higher than that the height that fixes a position boss 23 can set up, shaft hole 29 sets up on this location boss 23, and location boss 23 is passed to pivot 3, pivot 3 and the shaft hole 29 interference fit on the boss 23 of fixing a position.
As a preferred embodiment, the end plate 22 of the magnetic steel positioning frame 2 and the magnetic steel positioning frame 2 can be directly connected through the turbofan blade 21, so that the heat dissipation hole 24 can be formed between the magnetic steel positioning frame 2 and the end plate. With this structure, when the entire rotor structure rotates, the end plate 22 also drives the turbofan blade 21 to rotate together, which is equivalent to a turbofan, and can generate a large air flow, thereby achieving a better heat dissipation effect.
As a specific implementation mode, a plurality of magnetic steel positioning grooves 25 are arranged on the inner circumferential surface of the magnetic steel positioning frame 2, and the magnetic steel 4 is installed in the magnetic steel positioning grooves 25 through a fixing mechanism. As a preferred embodiment, the fixing mechanism includes an upper limit block 26, a lower limit block 27 and elastic fasteners 28 disposed at two sides around the magnetic steel positioning slot 25, and the magnetic steel 4 is limited between the upper limit block 26, the lower limit block 27 and the elastic fasteners 28. For the convenience of installation, the two elastic fasteners 28 can be arranged obliquely outwards, so that the magnetic steel 4 can be directly inserted.
In order to solve the dynamic balance of the rotor, a weighting balance clamp position can be arranged on the magnetic steel positioning frame 2 and used for pasting balance mud, so that the dynamic balance of the rotor can be solved by adopting a weighting mode.
The brushless motor outer rotor component has the following advantages: 1) the end plate of the magnetic steel positioning frame of the brushless motor outer rotor assembly is provided with the radially distributed turbofan blades, and when the rotor assembly rotates, the turbofan blades can generate strong airflow to remove heat outwards, so that the brushless motor outer rotor assembly has a better heat dissipation effect compared with a common brushless motor outer rotor; 2) the brushless motor outer rotor assembly is provided with a weighting balance clamping position on the magnetic steel positioning frame and used for pasting balance mud, the dynamic balance problem is solved by adopting a weighting method, a motor shell does not need to be cut to remove weight, and the performance of a motor is not influenced; 3) the magnetic steel positioning frame of the brushless motor outer rotor assembly is an injection molding piece, the outer end face of the end plate is provided with a positioning boss, and the positioning boss can be provided with an overlong height, so that the contact area between the positioning boss and the rotating shaft can be increased, the integral jumping after the positioning boss and the rotating shaft are pressed and mounted is ensured, and the product percent of pass is greatly improved; 4) the magnetic steel is fixed on the magnetic steel positioning frame by the fixing mechanism, and the bonding by glue is not needed, so that the production efficiency can be greatly improved, and meanwhile, the environmental pollution is prevented; 5) this brushless motor external rotor assembly magnet steel locating rack adopts the injection molding, only uses less metalwork, and whole rotor structure light in weight for product lightweight advantage reinforcing.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. The utility model provides a brushless motor external rotor subassembly, includes magnetic conduction circle, pivot, magnet steel locating rack and a plurality of magnet steel, magnetic conduction circle nested fix the magnet steel locating rack outward survey, its characterized in that: the magnetic steel positioning frame is an injection molding piece and is of a birdcage-shaped structure, the magnetic steels are installed in corresponding embedded grooves in the magnetic steel positioning frame at intervals, an end plate is arranged at the bottom of the magnetic steel positioning frame, turbofan blades distributed radially are arranged on the inner end face of the end plate, heat dissipation holes are formed in the periphery of the end plate, the rotating shaft is fixedly connected with a fixing column of the end plate, and the center of the rotating shaft is coaxially arranged with the magnetic steel positioning frame.
2. The external rotor assembly of brushless electric machine of claim 1, wherein: the inner end face and the outer end face of the end plate are provided with positioning column holes, the rotating shaft penetrates through the positioning column holes, and the rotating shaft is in interference fit with the positioning column holes.
3. The external rotor assembly of brushless electric machine of claim 1, wherein: and a weighting balance clamping position for sticking balance mud is arranged on the magnetic steel positioning frame.
4. The external rotor assembly of brushless electric machine of claim 1, wherein: the inner peripheral surface of the magnetic steel positioning frame is provided with a magnetic steel positioning groove, and the magnetic steel is arranged in the magnetic steel positioning groove through a fixing mechanism.
5. The brushless electric machine outer rotor assembly of claim 4, wherein: the fixing mechanism comprises an upper limiting block, a lower limiting block and elastic fasteners arranged on two sides of the periphery of the positioning groove, and the magnetic steel is limited between the upper limiting block, the lower limiting block and the elastic fasteners.
6. The external rotor assembly of brushless electric machine of claim 1, wherein: the end plate is connected with the magnetic steel positioning frame through the turbofan blades, and the heat dissipation holes are formed between the end plate and the magnetic steel positioning frame.
7. The external rotor assembly of brushless electric machine of claim 1, wherein: the magnetic conductive ring is in interference fit with the magnetic steel positioning frame.
8. The external rotor assembly of brushless electric machine of claim 1, wherein: the shape of the turbofan blade is involute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021746394.2U CN212784934U (en) | 2020-08-20 | 2020-08-20 | Brushless motor external rotor assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021746394.2U CN212784934U (en) | 2020-08-20 | 2020-08-20 | Brushless motor external rotor assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212784934U true CN212784934U (en) | 2021-03-23 |
Family
ID=75053578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021746394.2U Active CN212784934U (en) | 2020-08-20 | 2020-08-20 | Brushless motor external rotor assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212784934U (en) |
-
2020
- 2020-08-20 CN CN202021746394.2U patent/CN212784934U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 215000 No.88 shidaolu, Xukou Town, Wuzhong District, Suzhou City, Jiangsu Province Patentee after: SUZHOU RUIDONG ELECTRIC TECHNOLOGY CO.,LTD. Address before: 215000 F1-F2, Jinmao Industrial Park, 8 Dongshan Avenue, Xukou Town, Wuzhong District, Suzhou City, Jiangsu Province Patentee before: SUZHOU RUIDONG ELECTRIC TECHNOLOGY CO.,LTD. |
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| CP02 | Change in the address of a patent holder |