CN213425868U - Small-size and high-speed brushless motor of convenient assembly - Google Patents

Abstract

The utility model discloses a small and high-speed brushless motor who conveniently assembles, it includes casing (1) and detachably installs stator module (2) on casing (1), casing (1) includes inner tube (11), inner tube (11) top is provided with a plurality of axial braces that are used for stator module (2) support column (111), it is used for fixing to offer on support column (111) fixed orifices (112) of stator module (2), support column (111) outside is provided with reference column (113) protruding upwards and be used for stator module (2) location. The utility model discloses a brushless motor, stator module and casing easy dismounting, installation are accurate and intensity is high, and characteristics such as concrete small, the noise is low, the performance is excellent, rotational speed height, and the rotational speed can be up to 120000 r/min.

Description

Small-size and high-speed brushless motor of convenient assembly

Technical Field

The utility model relates to a motor device field, in particular to small and convenient high-speed brushless motor who assembles.

Background

In daily life of people, the scalp metabolism causes the head to generate dandruff continuously, and hair washing also becomes a part of the daily life of people. After washing the hair, people need to wash the hair and sleep or go out, a large amount of time is needed to be spent when the hair is naturally dried, the hair dryer facilitates the life of the people, the time for drying the hair of the people is shortened, and the life of the people is facilitated. With the improvement of the quality of life, people pay more and more attention to the care and maintenance of hair, so that on the basis of the existing hair dryer, people develop various care functional appliances, upgrade and upgrade the common hair dryer, so that the common hair dryer can be used for drying hair of family pets and the like, has wide application, and becomes a hair care appliance which is popular with people at present.

Except the motor of the hair care appliance, such as an electric hair drier and a hair curling rod, in some high-speed brushless dust collector motors, the stator assembly and the machine shell are assembled, the stator assembly is pressed in the machine shell in an interference mode, and the problems of inconvenient installation and disassembly, inaccurate installation and positioning, low installation strength and the like exist.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the above-mentioned defect among the prior art, provide a small and convenient high-speed brushless motor who assembles, can realize the accurate installation of stator module and casing.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:

the utility model provides a small and high-speed brushless motor of convenient assembly, it includes that casing and detachably install stator module on the casing, the casing includes the inner tube, the inner tube top is provided with a plurality ofly and is used for the axial to support stator module's support column, offer on the support column and be used for fixing stator module's fixed orifices, the support column outside is provided with the protruding reference column that just is used for the stator module location that makes progress.

Furthermore, the utility model discloses still include following subsidiary technical scheme:

the stator assembly includes a stator core including a yoke portion and a plurality of teeth portions spliced in the yoke portion.

The end face of the yoke part is provided with a plurality of through holes matched with the fixing holes, and the fixing holes are connected with the through holes through screws.

The outer side of the yoke part and the position corresponding to the through hole are provided with positioning blocks, and the outer walls of the positioning blocks are matched with the inner walls of the positioning columns.

The inner side of the yoke part is provided with a plurality of dovetail grooves for mounting the tooth part, and the tooth part comprises a dovetail part matched with the dovetail grooves, a winding part connected with the dovetail part and a pole shoe part connected with the winding part.

The stator core further comprises a plurality of frameworks detachably mounted on the winding portion, a plurality of windings wound on the frameworks, and a plurality of insulating paper inserted between the adjacent frameworks.

The casing also comprises an outer barrel sleeved outside the inner barrel, and a plurality of air guide blades are arranged between the inner barrel and the outer barrel.

The brushless motor further comprises a rotor assembly, the rotor assembly comprises a rotor magnetic ring, a bearing assembly and a fan, the bearing assembly is connected with the rotor magnetic ring, the fan is connected with the bearing assembly, the rotor magnetic ring is arranged in the stator assembly, and the bearing assembly is arranged in the inner barrel.

The bearing assembly comprises a rotating shaft, a plurality of bearings sleeved on the rotating shaft and a steel sleeve sleeved outside the bearings, wherein a rubber ring is arranged between each bearing and the corresponding steel sleeve.

The fan comprises a hub and a plurality of blades connected to the hub, the width of each blade is gradually increased outwards by taking the hub as the center, the horizontal angle of the section of each blade is gradually reduced outwards, and the thickness of each blade is gradually increased outwards.

Compared with the prior art, the utility model discloses beneficial effect lies in:

the utility model discloses a set up a plurality of support columns that are used for axial support stator module on the inner tube top to set up the fixed orifices that is used for fixed stator module on the support column, made things convenient for the dismantlement and the installation of stator module and casing, improved the installation intensity between stator module and the casing simultaneously, the support column outside is provided with the reference column that makes progress the arch and be used for the accurate location of stator module, has improved the installation accuracy between stator module and the casing.

In the preferred scheme of the utility model, the stator core adopts the splicing of yoke part and a plurality of tooth parts, the structure is novel, the traditional motor structure is abandoned, the irregular stator magnetic circuit is formed, the motor has compact space, small volume, convenient assembly and excellent performance, the magnetic circuit of the magneto is complete and reliable, and the process is simple in the processing process; the end face of the yoke part is provided with a plurality of through holes matched with the fixing holes, and the fixing holes are connected with the through holes through screws, so that the assembly and disassembly operability of the stator assembly and the shell is improved; the positioning block arranged on the outer side of the yoke part is matched with the positioning column at high precision, so that the mounting precision between the stator assembly and the shell is further improved; the winding part is provided with the detachable framework, and the winding is installed on the framework, so that the winding process is simplified.

In the preferred scheme of the utility model, the bearing assembly adopts a rubber cantilever type, which ensures that the bearing is not directly contacted with the steel bushing, thereby achieving the effects of shock absorption and noise reduction; the fan blade is characterized in that the hub is used as the center, the width of each fan blade is gradually increased outwards, the horizontal angle of the section of each fan blade is gradually reduced outwards, the thickness of each fan blade is gradually increased outwards, the air inlet volume of each fan blade is increased, and the noise generated by the resonance of the fan blades when the motor rotates at a high speed can be overcome.

Drawings

Fig. 1 is a schematic structural diagram of a brushless motor according to the present invention.

Fig. 2 is a sectional view a-a in fig. 1.

Fig. 3 is a schematic structural diagram of the middle housing of the present invention.

Fig. 4 is an enlarged schematic view of a portion B in fig. 3.

Fig. 5 is a top view of the middle housing of the present invention.

Fig. 6 is a schematic structural diagram of the stator assembly of the present invention.

Fig. 7 is a cross-sectional view C-C of fig. 6.

Fig. 8 is a schematic structural diagram of the stator core in the present invention.

Fig. 9 is a schematic structural view of a yoke according to the present invention.

Fig. 10 is a schematic structural view of a tooth portion in the present invention.

Fig. 11 is a schematic structural diagram of the middle frame of the present invention.

Fig. 12 is a schematic structural view of the insulation paper of the present invention.

Fig. 13 is a plan view of the insulating paper of the present invention.

Fig. 14 is a schematic structural view of a rotor assembly according to the present invention.

Fig. 15 is a sectional view taken along line G-G in fig. 14.

Fig. 16 is a schematic structural diagram of the fan according to the present invention.

Fig. 17 is a schematic view of the structure of the present invention in which a hub and a blade are connected.

Fig. 17a is a cross-sectional view of a blade according to the invention at a distance of 8mm from the hub centre.

Fig. 17b is a cross-sectional view of a blade according to the present invention at a distance of 10mm from the hub center.

Fig. 17c is a cross-sectional view of a blade of the present invention at 12mm from the hub center.

Fig. 18 is a simulation effect diagram of the stator and rotor magnetic paths according to an embodiment of the present invention.

Fig. 19 is a waveform diagram of an output torque according to an embodiment of the present invention.

Fig. 20 is a diagram of a back emf waveform of an embodiment of the invention.

Fig. 21 is a waveform diagram of the air gap flux density according to an embodiment of the present invention.

Fig. 22 is a waveform diagram of the magnetic density of a yoke portion of a stator core according to an embodiment of the present invention.

Fig. 23 is a waveform diagram of magnetic flux density of a tooth portion according to an embodiment of the present invention.

Fig. 24 is a waveform diagram of magnetic flux density of a tooth portion according to an embodiment of the present invention.

Wherein: 1. a housing; 11. an inner barrel; 111. a support pillar; 112. a fixing hole; 113. a positioning column; 12. an outer cylinder; 13. a wind guide blade; 2. a stator assembly; 21. a stator core; 211 a yoke portion; 2111. a through hole; 2112. positioning blocks; 2113. a dovetail groove; 212. a tooth portion; 2121. a swallowtail; 2122. a winding part; 2123. a pole shoe portion; 216. a motor air gap; 22. a framework; 221. a wiring board; 222. a support frame; 223. mounting a through hole; 23. a winding; 24. insulating paper; 3. a rotor assembly; 31. a rotor magnetic ring; 32. a bearing assembly; 321. a rotating shaft; 322. a bearing; 323. steel jacket; 324. a rubber ring; 325. a silica gel pad; 33. a fan; 331. a hub; 332. a blade.

Detailed Description

The following non-limiting detailed description of the present invention is provided in connection with the preferred embodiments and accompanying drawings.

As shown in fig. 1 and fig. 2, the high-speed brushless motor according to a preferred embodiment of the present invention includes a casing 1, a stator assembly 2 detachably mounted on the casing 1, and a rotor assembly 3 inserted into the casing 1 and the stator assembly 2.

As shown in fig. 3 to 5, the casing 1 includes an inner cylinder 11 and an outer cylinder 12, the inner cylinder 11 and the outer cylinder 12 are concentric circles to form a straight air passage for air circulation, and a plurality of air guide blades 13 are disposed between the inner cylinder 11 and the outer cylinder 12 to divide the straight air passage into a plurality of uniform air passages. The diameter of the outer cylinder 12 is preferably 26-28mm, which ensures the size of the motor volume. The diameter of the inner cylinder 11 is preferably 13mm, a plurality of support columns 111 for axially supporting the stator assembly 2 are uniformly arranged at the top end of the inner cylinder 11, fixing holes 112 for fixing the stator assembly 2 are formed in the support columns 111, positioning columns 113 which are convex upwards and used for accurately positioning the stator assembly 2 are arranged on the outer sides of the support columns 111, in this embodiment, preferably 3 support columns 111 are uniformly arranged at the top end of the inner cylinder 11, and the height of each support column 111 is 4-5 mm; the fixing hole 112 is an M2 screw hole, and the effective depth is 3-3.5 mm; the height of the positioning columns 113 is 1.5-2.5mm, 3 positioning columns 113 enclose a positioning circle with the diameter of 16-18mm, and the stator assembly 2 is installed in the positioning circle. Of course, 4 or more support columns 111 and positioning columns 113 can be disposed at the top end of the inner cylinder 11, as long as the axial supporting, fixing and positioning effects can be achieved.

As shown in fig. 6 and 7, the stator assembly 2 includes a stator core 21, a plurality of bobbins 22 detachably mounted in the stator core 21, a plurality of windings 23 wound around the bobbins 22, and a plurality of insulating papers 24 inserted between the adjacent bobbins 22.

As shown in fig. 8 to 9, the stator core 21 includes a yoke portion 211 and a plurality of tooth portions 212 spliced in the yoke portion 211. Wherein, the yoke part 211 is preferably irregular and connected with the magnetic circuit, the maximum outer diameter is 16-18mm, and the wall thickness is 1.18-2.2 mm. A plurality of dovetail grooves 2113 for mounting the tooth portions 212 are formed inside the yoke portion 211, and the preferred dimensions of the dovetail grooves 2113 are: the bevel angle D1 is 20-30 degrees, the shortest bevel distance E1 is 1.5-1.7mm, and the depth F1 is 1.3-1.5 mm; the end face of the yoke part 211 is provided with a plurality of through holes 2111 matched with the fixing holes 112, the fixing holes 112 are connected with the through holes 2111 through screws, so that the stator assembly 2 is reliably fixed on the casing 1, and the diameter of the through holes 2111 is preferably 2.05-2.2 mm; the positioning blocks 2112 are arranged at the positions, corresponding to the through holes 2111, of the outer side of the yoke portion 211, the diameter of a circle formed by the plurality of positioning blocks 2112 is preferably 16.5-17.5mm, when the stator assembly 2 is installed on the machine shell 1, the outer wall of each positioning block 2112 is matched with the inner wall of the corresponding positioning column 113 in a high-precision mode, and the coaxiality of the stator assembly and the rotor assembly is guaranteed. The dovetail grooves 2113 and the through holes 2111 are uniformly distributed on the yoke portion 211 and are arranged in a staggered mode, and the yoke portion 211 connected between the dovetail grooves 2113 and the through holes 2111 is of an arc-shaped structure. In this embodiment, 3 positioning blocks 2112 are disposed outside the yoke 211 and correspond to the positioning posts 113, and 3 through holes 2111 are disposed at the end of the yoke 211 and correspond to the fixing holes 112. Of course, the number of the supporting columns 111 and the positioning columns 113 provided at the top end of the inner cylinder 11 can be adjusted adaptively.

As shown in fig. 10, the tooth portion 212 includes a dovetail portion 2121 fitted with the dovetail groove 2113, a winding portion 2122 connected to the dovetail portion 2121, and a pole piece portion 2123 connected to the winding portion 2122. In which the dovetail 2121 mates with the dovetail slot 2113, the tooth portion 212 is likely to be radially dislodged if the dimensions and angles are too large and the tooling is not workable on a die and is too small. Thus, the preferred dimensions of the dovetail 2121 are: the angle D2 of the bevel edge is 20-30 degrees, the shortest distance E2 of the bevel edge is 1.5-1.7mm, the depth F2 is 1.3-1.5mm, and the yoke part 211 can be clamped well; the winding portion 2122 provides a magnetic flux to the tooth portion 212, and has a width I of preferably 2.3-2.5 mm; the thickness of the pole shoe part 2123 is gradually reduced from the middle to two sides, the thickness is preferably 0.8-1.2mm, if the central angle corresponding to the pole shoe part 2123 is too small, the magnetic flux passing through the pole shoe part 2123 is reduced, a part of air gap flux density is weak, a magnetic circuit is affected, a back electromotive force waveform of the motor is abnormal, the performance of the motor is affected, if the angle is too large, a space is occupied, the winding part 2122 is reduced, and a situation that the winding 23 cannot be installed may occur, so in the embodiment, the central angle H corresponding to the pole shoe part 2123 is preferably 93-105 degrees, and the magnetic density of the magnetic circuit is ensured; wherein, the pole shoe portions 2123 of the plurality of teeth portions 212 define a motor air gap 216, the inner diameter of the motor air gap 216 is preferably 7.1-7.4mm, and the rotor magnetic ring 31 of the rotor assembly 3 is installed in the motor air gap 216. In this embodiment, the stator assembly 2 is formed by splicing 3 identical tooth parts 212 and yoke parts 211, the stator assembly 2 is irregular to form an irregular stator magnetic circuit, a traditional motor structure is abandoned, and a high-speed brushless motor with compact space, small volume, convenient assembly and excellent performance is designed and developed.

As shown in fig. 11, the bobbin 22 includes a support bracket 222 provided on the circumferential side of the terminal block 221, the support bracket 222 is provided with a mounting through hole 223, and a winding portion 2122 and a dovetail portion 2121 are inserted into the mounting through hole 223, so that the support bracket 222 is provided on the winding portion 2122 of the tooth portion 212 as a support for the winding 23. In the present embodiment, 3 support frames 222 are provided on the circumferential side of the wiring board 221 corresponding to the number of the teeth 212.

As shown in fig. 12 and 13, the insulating paper 24 is inserted between the adjacent frameworks 22, and is in a zigzag shape formed by three circular arcs, and the radius size of the three circular arcs is preferably 1.2-2.0 mm. When the insulating paper 24 is installed, the end part of the insulating paper 24 is inserted between the framework 22 and the yoke part 211 and extends into the groove of the yoke part 211, and one surface of the insulating paper 24 is attached to the yoke part 211 between the adjacent frameworks 22.

As shown in fig. 14 and 15, the rotor assembly 3 includes a rotor magnetic ring 31, a bearing assembly 32 connected to the rotor magnetic ring 31, and a fan 33 connected to the bearing assembly 32. The rotor magnetic ring 31 is arranged in the motor air gap 216 and is made of a sintered magnetic ring N35SH, preferably, the outer diameter is 5.4-6.2mm, the inner diameter is 3mm, and the height is 12 mm; the bearing assembly 32 comprises a rotating shaft 321 and a plurality of bearings 322 sleeved on the rotating shaft 321, a silica gel pad 325 used for supporting is arranged between the adjacent bearings 322, a silica gel material can play a role in shock absorption and noise reduction, a steel sleeve 323 is sleeved outside the bearing 322, a plurality of grooves matched with the bearings 322 are formed in the inner side of the steel sleeve 323, the bearings 322 are installed in the grooves, a rubber ring 324 used for supporting the bearings 322 is arranged between each groove and the corresponding bearing 322, the shock absorption and noise reduction can be achieved, the rotor magnetic ring 31 is sleeved on the rotating shaft, and a shaft sleeve 326 is arranged between each rotor magnetic ring 31 and the corresponding bearing 322. In this embodiment, the rotating shaft 321 is made as an optical axis, and has a diameter of 3mm and a length of 41 mm; the bearing 322 belongs to a high-speed bearing, and the applicable maximum rotating speed is 120000 r/min; the steel sleeve 323 is made of GCr15 material, the outer diameter is 10mm, the inner diameter is 8mm, the height is 11mm, the diameter of the groove at the inner side is 8.95-9.05mm, and the height is 1.9-2.1 mm; the sleeve 326 is made of POM material, and has an outer diameter of 4mm, an inner diameter of 3mm and a height of 4.5 mm.

As shown in fig. 16, the fan 33 is disposed on the rotating shaft 321, and the fan 33 includes a hub 331 and a plurality of blades 332 connected to the hub 331. The width of the blade 332 is gradually increased outwards with the hub 331 as a center, the horizontal angle of the cross section of the blade 332 is gradually decreased outwards, and the thickness of the blade 332 is gradually increased outwards. In this embodiment, preferably 11 blades are used, and the fan 33 has an outer diameter of

The effective ventilation area can reach 250-350mm²。

The specific shape of one blade 332 will be described as an example. Fig. 17 is a schematic view showing a structure in which a hub 331 and a blade 332 are coupled, respectively sectioned at positions g, h, and i from the center of the hub 331. Fig. 17a is a cross-sectional view of the blade 332 at g-8 mm, the blade 332 having a horizontal angle a in the cross-section ranging from 30 ° to 40 °, the blade 332 having a width b ranging from 7mm to 8mm, the blade 332 having a thickness gradually increasing from thin to thick; fig. 17b is a cross-sectional view of the blade 332 at h-10 mm, the horizontal angle c of the cross-section of the blade 332 is in the range of 20-35 °, the width d of the blade 332 is in the range of 8-9 mm, and the thickness of the blade 332 gradually increases from thin to thick, but the increase decreases; fig. 17c is a cross-sectional view of the blade 332 at i-12 mm, the blade 332 having a cross-sectional horizontal angle e in the range of 20-30, the blade 332 having a width f in the range of 9-10 mm, and the blade 332 having a relatively uniform thickness; the thickness of the entire blade 332 is between 0.2 and 1 mm. The adjustable space of blade angle so designed is big, realizes big intake, and can overcome the noise problem that the blade resonance produced when the motor rotates at a high speed.

The utility model discloses a high-speed brushless motor sets up a plurality of support columns at the inner tube top to set up the fixed orifices on the support column, made things convenient for the dismantlement and the installation of stator module and casing, improved the installation intensity between stator module and the casing simultaneously, the support column outside is provided with the reference column of upwards protruding, has improved the installation accuracy between stator module and the casing; the stator core is spliced by the yoke part and the plurality of tooth parts, the yoke part is in an irregular shape, the structure is novel, the magnetic circuit is complete, the size is smaller, and the process is simple in the machining process; the dovetail part and the dovetail groove are designed to be appropriate in size and can be well clamped together; the thickness of the pole shoe part is reasonably designed, so that the magnetic density of a magnetic circuit is ensured; the winding part is provided with a detachable framework, and the winding is arranged on the framework, so that the winding process is simplified; the end face of the yoke part is provided with a plurality of through holes matched with the fixing holes, and the fixing holes are connected with the through holes through screws, so that the assembly and disassembly operability of the stator assembly and the shell is improved; the positioning block arranged on the outer side of the yoke part is matched with the positioning column at high precision, so that the mounting precision between the stator assembly and the shell is further improved; the bearing assembly is of a rubber cantilever type, so that the bearing is not directly contacted with the steel sleeve, and the effects of shock absorption and noise reduction are achieved; the rotating speed of the motor is high and can reach 120000r/min to the maximum; the adjustable space of blade angle is big, has increased the intake of blade, and can overcome the noise that the blade resonance produced when the motor is high-speed rotatory, and this motor except can be applied to hair care appliances such as hair drier, curler, also can be applied to in the high-speed dust catcher.

Finally, please refer to fig. 18-24, fig. 18-24 are simulation test effect diagrams of an embodiment of the above motor scheme of the present invention. As can be seen from the simulation result of the magnetic circuit diagram of the stator and rotor in fig. 18, the magnetic circuit of the magnetic motor of the present embodiment is complete and reliable, and as can be seen from the torque simulation result in fig. 19, the motor of the present invention can provide stable and sufficient torque, which indicates that the design of various parameters meets the requirements; referring to the back electromotive force simulation result shown in fig. 20, the back electromotive force waveform tends to be more sinusoidal, the harmonic wave is small, the efficiency is high, the harmonic vibration is small, and the electromagnetic noise of the motor is low; referring to the air gap flux density simulation result shown in fig. 21, the air gap flux density in the present embodiment meets the design requirements of the motor, and provides sufficient magnetic flux for the motor to operate; referring to the simulation result of the magnetic density of the yoke part of the stator core shown in fig. 22, the magnetic saturation phenomenon cannot occur within 1.5T of the magnetic flux of the yoke part of the stator, and the efficiency of the motor cannot be reduced; the simulation results of the magnetic densities of the teeth shown in fig. 23 and 24 show that the magnetic flux leakage phenomenon is not too large, the magnetic density parameter is about 1.5T, and the saturation phenomenon is not generated.

It should be noted that the above-mentioned preferred embodiments are only for illustrating the technical concepts and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention accordingly, and the protection scope of the present invention cannot be limited thereby. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (10)

1. The utility model provides a small and high-speed brushless motor of convenient assembly which characterized in that: it includes casing (1) and detachably installs stator module (2) on casing (1), casing (1) includes inner tube (11), inner tube (11) top is provided with a plurality of support columns (111) that are used for the axial to support stator module (2), offer on support column (111) and be used for fixing stator module's (2) fixed orifices (112), support column (111) outside is provided with upwards protruding and be used for stator module (2) location reference column (113).

2. The brushless electric machine according to claim 1, wherein: the stator assembly (2) comprises a stator core (21), wherein the stator core (21) comprises a yoke part (211) and a plurality of tooth parts (212) spliced in the yoke part (211).

3. The brushless electric machine of claim 2, wherein: the end face of the yoke part (211) is provided with a plurality of through holes (2111) matched with the fixing holes (112), and the fixing holes (112) are connected with the through holes (2111) through screws.

4. The brushless electric machine of claim 3, wherein: the outer side of the yoke portion (211) and the position corresponding to the through hole (2111) are provided with a positioning block (2112), and the outer wall of the positioning block (2112) is matched with the positioning column (113).

5. The brushless electric machine of claim 2, wherein: the inner side of the yoke part (211) is provided with a plurality of dovetail grooves (2113) for mounting the tooth part (212), and the tooth part (212) comprises a dovetail part (2121) matched with the dovetail grooves (2113), a winding part (2122) connected with the dovetail part (2121) and a pole shoe part (2123) connected with the winding part (2122).

6. The brushless electric machine of claim 5, wherein: the stator core (21) further comprises a plurality of frameworks (22) detachably mounted on the winding part (2122), a plurality of windings (23) wound on the frameworks (22), and a plurality of insulating paper (24) inserted between the adjacent frameworks (22).

7. The brushless motor according to any one of claims 1 to 6, wherein: the casing (1) further comprises an outer barrel (12) sleeved outside the inner barrel (11), and a plurality of air guide blades (13) are arranged between the inner barrel (11) and the outer barrel (12).

8. The brushless motor according to any one of claims 1 to 6, wherein: the brushless motor further comprises a rotor assembly (3), the rotor assembly (3) comprises a rotor magnetic ring (31), a bearing assembly (32) connected with the rotor magnetic ring (31) and a fan (33) connected with the bearing assembly (32), the rotor magnetic ring (31) is arranged in the stator assembly (2), and the bearing assembly (32) is arranged in the inner barrel (11).

9. The brushless electric machine of claim 8, wherein: the bearing assembly (32) comprises a rotating shaft (321), a plurality of bearings (322) sleeved on the rotating shaft (321) and a steel sleeve (323) sleeved outside the bearings (322), wherein a rubber ring (324) is arranged between the bearings (322) and the steel sleeve (323).

10. The brushless electric machine of claim 8, wherein: the fan (33) comprises a hub (331) and a plurality of blades (332) connected to the hub (331), wherein the width of each blade (332) is gradually increased outwards with the hub (331) as the center, the horizontal angle of the cross section of each blade (332) is gradually reduced outwards, and the thickness of each blade (332) is gradually increased outwards.

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