CN107888009B - Outer rotor motor stator assembly - Google Patents

Abstract

An external rotor motor stator assembly is used to solve the problems caused by the existing external rotor motor having a bearing in the shaft tube. The stator assembly of the outer rotor motor of the present invention includes a lower bearing seat with a shaft tube, a first chamber and a joint shoulder. The first chamber is connected to the internal space of the shaft tube, and the joint shoulder is provided on the shaft tube. The outer circumferential surface of the shaft tube; an iron core with a combination channel, the iron core is combined with the lower bearing seat and abuts the joint shoulder; and an upper bearing seat with a fixed part, a second containing chamber and A bearing part, the second chamber is connected to the internal space of the fixed part, the bearing part is in contact with the iron core; the shaft tube and the fixed part respectively extend into the combining channel from both ends of the combining channel, And the maximum radial width of the joint shoulder part and the bearing part is greater than the maximum radial width of the joint channel.

Description

Outer rotor motor stator assembly

technical field

The present invention relates to an outer rotor motor stator assembly, in particular to an outer rotor motor stator assembly that can quickly and stably install two bearings.

Background technique

Referring to FIG. 1 , an existing outer rotor motor 9 is disclosed. The outer rotor motor 9 includes a base 91 , two bearings 92 , a stator 93 and a rotating member 94 . The base 91 has a shaft tube 911 for accommodating the two bearings 92; the stator 93 is combined with the outer peripheral surface of the shaft tube 911, so that the bearing 92 and the stator 93 are aligned with each other in the radial direction of the shaft tube 911; the The rotating member 94 has a rotating shaft 941 extending into the shaft tube 911 and rotatably combined with the bearing 92 .

However, since the two bearings 92 must be fixed in default positions relative to the shaft tube 911 and the rotating member 94 at the same time, the assembly process of the conventional outer rotor motor 9 is complicated and may cause problems in operation or assembly stability. Specifically, during the assembly process of the rotating shaft 941 and the two bearings 92 , the rotating shaft 941 must be passed through the two bearings 92 first, and a C-shaped ring buckle must be assembled on the rotating shaft 941 through the bottom end opening of the shaft tube 911 . However, if the rotating shaft 941 is pressed down too much so that the C-ring can not be in contact with the bearing 92 close to the bottom end opening of the shaft tube 911, it may cause the rotating member 94 to generate axial vibration during operation; Furthermore, if the rotating member 94 is pulled upward until the C-ring is abutted against the bearing 92 , it cannot be confirmed whether the bearing 92 close to the top opening of the shaft tube 911 is disengaged. In addition, the above-mentioned outer rotor motor 9 cannot be used for assembling two bearings of different sizes, so there is still a need for improvement.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides an outer rotor motor stator assembly, which not only facilitates the design and assembly of the bearing, but also provides sufficient structural strength for the stator assembly.

The outer rotor motor stator assembly of the present invention includes a lower bearing seat, has a shaft tube, a first chamber and an engaging shoulder, the first chamber communicates with the inner space of the shaft tube, and the engaging shoulder is disposed on the The outer peripheral surface of the axle tube; an iron core with a joint channel, the iron core is combined with the lower bearing seat and abuts the joint shoulder; and an upper bearing seat with a fixing part and a second accommodating chamber and a bearing part, the second accommodating chamber communicates with the inner space of the fixing part, the bearing part abuts the iron core; wherein the shaft tube and the fixing part respectively protrude into the combination channel from both ends of the combination channel inside, and the maximum radial width of the engaging shoulder and the bearing portion are both greater than the maximum radial width of the combining channel. Accordingly, the outer rotor motor stator assembly of the present invention can be more convenient to assemble the bearing, and can have sufficient structural strength.

Wherein, the maximum radial width of the first chamber and the second chamber are both larger than the maximum radial width of the inner space of the fixing portion; the structure further increases the radial width of the excitation portion to increase the maximum radial width of the motor Torque, etc.

Wherein, the maximum radial width of the second chamber is greater than or equal to the maximum radial width of the first chamber.

Wherein, the lower bearing seat also has a third chamber, the third chamber communicates with the first chamber and the inner space of the shaft tube, and the maximum radial width of the third chamber is smaller than the width of the first chamber. The maximum radial width, and the maximum radial width of the third chamber is greater than the maximum radial width of the inner space of the fixing portion; the structure has the effect of making the lower bearing seat suitable for bearings of different sizes.

Among them, it further includes a first bearing and a second bearing, the first bearing is arranged in the first chamber, the second bearing is arranged in the second chamber, and the outer diameter of the first bearing is not larger than the first bearing. The outer diameter of the two bearings; the structure has the effect of carrying the rotor coupled to the stator assembly with the most appropriately sized bearing depending on the requirements.

Among them, it further includes a first bearing and a second bearing, the first bearing is arranged in the third chamber, the second bearing is arranged in the second chamber, and the outer diameter of the first bearing is smaller than the second bearing The outer diameter of the bearing; the structure has the effect of carrying the rotor coupled to the stator assembly with the most appropriately sized bearing depending on the requirements.

Wherein, the bearing portion has a ring bottom plate and a side wall, the ring bottom plate and the side wall form the second chamber, and the second bearing protrudes from the side wall.

Wherein, the bearing portion has a ring bottom plate and a side wall, the ring bottom plate and the side wall form the second chamber, and the second bearing is flush with the side wall.

Wherein, the bearing portion has a ring bottom plate, the iron core has an insulating sleeve, the insulating sleeve forms a side wall portion on the surface facing the upper bearing seat, the ring bottom plate and the side wall portion together accommodate the second bearing .

Wherein, the first accommodating chamber is partially located in the combining channel; or, the first containing chamber is completely located outside the combining channel.

Wherein, the lower bearing seat has a first open end, the first open end is formed at one end of the axle tube, and the first open end is located in the combining channel.

Wherein, the upper bearing seat has a second open end, the second open end is formed at one end of the fixing portion, and the second open end is located in the combining channel.

Wherein, the fixing portion and the shaft tube are arranged at intervals in the axial direction of the shaft tube; the structure has the effect of enabling the upper bearing seat to be firmly abutted on the iron core and the like.

Wherein, the upper bearing seat has a second open end, the second open end is formed at one end of the fixing portion, and the second open end is located in the combining channel, the first open end is perpendicular to the shaft tube A radial direction of the axial direction forms an inner top surface and an outer top surface, the second open end forms an inner annular surface and an outer annular surface along the radial direction, wherein the inner annular surface faces the inner top surface, the The outer ring surface faces the outer top surface; the structure has the functions of combining the lower bearing seat, the iron core and the upper bearing seat more stably.

Wherein, the upper bearing seat has a second open end, the second open end is formed at one end of the fixing portion, and the second open end is located in the combining channel, and the first open end is along the outer circumference of the shaft tube The direction forms at least one first top surface and at least one second top surface alternately arranged, and the second open end forms at least one tooth top surface and at least one tooth bottom surface alternately arranged along the peripheral direction, wherein the tooth top surface faces the The first top surface, the tooth bottom surface faces the second top surface; the structure has the effect of more firmly combining the lower bearing seat, the iron core and the upper bearing seat.

Wherein, the second open end has an outward guiding inclined surface; the structure has the effect that the upper bearing seat can be introduced into the combining channel more easily.

Wherein, the iron core forms an inner peripheral wall of the coupling channel, and the inner peripheral wall of the coupling channel is tightly fitted and combined with the outer peripheral wall of the shaft tube and the outer peripheral wall of the fixing portion.

Wherein, the iron core forms the inner peripheral wall of the combining channel, and there is an adhesive layer between the inner peripheral wall of the combining channel and the outer peripheral wall of the shaft tube.

Wherein, the iron core forms the inner peripheral wall of the combining channel, and there is an adhesive layer between the inner peripheral wall of the combining channel and the outer peripheral wall of the fixing portion.

Description of drawings

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Figure 1: A schematic side sectional view of the structure of a conventional external rotor motor;

Figure 2: An exploded perspective view of the outer rotor motor stator assembly according to the first embodiment of the present invention;

Figure 3: A combined cross-sectional view of the outer rotor motor stator assembly according to the first embodiment of the present invention;

Figure 4: A partial combined cross-sectional view of the stator assembly of the outer rotor motor according to the first embodiment of the present invention;

Figure 5: A combined cross-sectional view of the outer rotor motor stator assembly with a smaller size first bearing according to the first embodiment of the present invention;

Figure 6: A combined cross-sectional view of the lower bearing seat of the outer rotor motor stator assembly having only a single bearing chamber according to the first embodiment of the present invention;

FIG. 7 is a combined cross-sectional view of another embodiment in which the lower bearing seat of the outer rotor motor stator assembly only has a single bearing chamber according to the first embodiment of the present invention;

8: An exploded perspective view of the lower bearing seat and the upper bearing seat of the outer rotor motor stator assembly according to the second embodiment of the present invention;

9: An exploded perspective view of the lower bearing seat and the upper bearing seat of the outer rotor motor stator assembly according to the third embodiment of the present invention;

10: An exploded perspective view of the lower bearing seat and the upper bearing seat of the outer rotor motor stator assembly according to the fourth embodiment of the present invention;

Figure 11: A combined cross-sectional view of the outer rotor motor stator assembly of the fifth embodiment of the present invention.

Description of reference numerals

1 Lower bearing housing 11 Axle tube

12 The first chamber 13 The first open end

131 Inner top surface 132 Outer top surface

133 First top surface 134 Second top surface

14 Engagement shoulder 15 Third compartment

2 iron cores 21 combined channels

211 First end 212 Second end

22 Excitation part 221 Pole

222 Winding 23 Insulation Sleeve

231 Side wall

3 Upper bearing seat 31 Fixed part

32 Second chamber 33 Second open end

331 Inner ring 332 Outer ring

333 Tooth top surface 334 Tooth bottom surface

335 Outer guide slope 34 Bearing part

341 Ring base plate 342 Side wall

4 First bearing

5 Second bearing

W1 Maximum radial width of engagement shoulder W2 Maximum radial width of first chamber

W3 Maximum radial width of the combined channel W4 Maximum radial width of the bearing part

W5 The maximum radial width of the second chamber W6 The maximum radial width of the inner space of the fixing part

W7 Maximum radial width of the third chamber

D1 First bearing outer diameter D2 Second bearing outer diameter

﹝current technology﹞

9 Outer rotor motor 91 Base

911 Axle tube 92 Bearing

93 Stator 94 Rotor

941 reels.

Detailed ways

In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious and easy to understand, the preferred embodiments of the present invention are exemplified below, and are described in detail as follows in conjunction with the accompanying drawings:

Please refer to FIG. 2 to FIG. 4 , which are the first embodiment of the stator assembly of the outer rotor motor of the present invention. The stator assembly includes a lower bearing seat 1, an iron core 2, an upper bearing seat 3, a first bearing 4 and a second bearing 5, wherein the lower bearing seat 1 and the upper bearing seat 3 are combined with the iron core 2 , the first bearing 4 is combined with the lower bearing seat 1 , and the second bearing 5 is combined with the upper bearing seat 3 . Wherein, "up" and "down" in the lower bearing seat 1 and the upper bearing seat 3 only correspond to the orientations in the drawings, and do not limit the actual installation state of the outer rotor motor stator assembly of the present invention.

Specifically, the lower bearing seat 1 of the stator assembly has a shaft tube 11 extending in an axial direction, and a first chamber 12 and a first open end 13 are respectively formed in the shaft tube 11 at the position of the shaft tube 11 . The two ends in the axial direction, wherein the first chamber 12 communicates with the inner space of the shaft tube 11 . The lower bearing seat 1 also has an engaging shoulder 14, and the engaging shoulder 14 is disposed on the outer peripheral surface of the axle tube 11, wherein the lower bearing seat 1 is preferably composed of a metal material. Wherein, the engaging shoulder 14 has a maximum radial width W1 in the radial direction perpendicular to the axial direction; and the first chamber 12 has a maximum radial width W2.

The iron core 2 of the stator assembly includes a coupling channel 21 and a plurality of excitation parts 22. The coupling channel 21 forms a first end 211 and a second end 212 in the axial direction for the shaft tube 11 to pass through the first end 211. One end 211 extends into the coupling channel 21 and the first open end 13 is located in the coupling channel 21 , and the iron core 2 preferably abuts the coupling shoulder 14 on the side where the first end 211 is formed. So that the iron core 2 can be stably arranged on the lower bearing seat 1 . The plurality of excitation parts 22 are disposed around the coupling channel 21 , and each excitation part 22 has a pole 221 and a winding 222 , wherein the pole 221 extends along a radial direction perpendicular to the axial direction, and the winding The wire 222 is fixed around the outer peripheral surface of the pole 221 . The coupling channel 21 also has a maximum radial width W3 in the radial direction, and the maximum radial width W1 of the engaging shoulder 14 is greater than the maximum radial width W3 of the coupling channel 21 .

The upper bearing seat 3 of the stator assembly includes a fixing portion 31 and a second accommodating chamber 32, the fixing portion 31 and the second accommodating chamber 32 are respectively located on both sides of the upper bearing seat 3 in the axial direction, And the second chamber 32 communicates with the inner space of the fixing portion 31 . A second open end 33 is formed at the end of the fixing portion 31 facing away from the second chamber 32 , and the upper bearing seat 3 forms the second chamber 32 with a bearing portion 34 . The fixing portion 31 extends into the combining channel 21 from the second end 212 of the combining channel 21 , so that the second open end 33 is located in the combining channel 21 , and the second chamber 32 and the bearing portion 34 are located in the combining channel 21 . Outside the coupling channel 21, the bearing portion 34 abuts against the side of the iron core 2 where the second end 212 is formed, wherein the upper bearing seat 3 is preferably made of metal material. The bearing portion 34 may include a ring bottom plate 341 and a side wall 342 , the ring bottom plate 341 preferably extends in a radial direction perpendicular to the axial direction, and the side wall 342 is connected to the diameter of the ring bottom plate 341 . To the outer edge, the second chamber 32 is jointly formed by the ring bottom plate 341 and the side walls 342 . In addition, the bearing portion 34 has a maximum radial width W4 in the radial direction perpendicular to the axial direction; the second chamber 32 has a maximum radial width W5; and the inner space of the fixing portion 31 also has a Maximum radial width W6. Wherein, the maximum radial width W4 of the bearing portion 34 is greater than the maximum radial width W3 of the combining channel 21 , and the maximum radial width W2 of the first chamber 12 and the maximum radial width W5 of the second chamber 32 Both are larger than the maximum radial width W6 of the inner space of the fixing portion 31 . Since the maximum radial widths W1 and W4 of the engaging shoulder portion 14 and the bearing portion 34 are both larger than the maximum radial width W3 of the combining channel 21 , the lower bearing seat 1 and the upper bearing seat 3 can be stably connected to the iron core 2 . combined into one. In addition, the maximum radial widths W2 and W5 of the first chamber 12 and the second chamber 32 are set larger than the maximum radial width W6 of the inner space of the fixing portion 31 , so that the excitation portion 22 can be further increased. The radial width of the motor increases the maximum torque of the motor. In addition, the maximum radial width W2 of the first chamber 12 is preferably not greater than the maximum radial width W5 of the second chamber 32 .

The first bearing 4 of the stator assembly is arranged on the lower bearing seat 1 and accommodated in the first chamber 12; the second bearing 5 is arranged on the upper bearing seat 3 and accommodated in the first chamber 12 in the second chamber 32 . The first bearing 4 and the second bearing 5 each have an outer diameter D1 and D2 in the radial direction perpendicular to the axial direction, and the outer diameter D1 of the first bearing 4 is not larger than the outer diameter of the second bearing 5 D2. Thereby, the rotor coupled to the stator assembly can be supported by a bearing having the most appropriate size as required. In addition, the second bearing 5 accommodated in the second chamber 32 may protrude from the top end of the side wall 342 of the bearing portion 33 in the axial direction; alternatively, the second bearing 5 may also be connected to the side wall The top of the 342 is flush.

The stator assembly also has the following technical features: the iron core 2 forms an inner peripheral wall of the coupling channel 21, and the inner peripheral wall of the coupling channel 21 is tightly fitted to the outer peripheral wall of the shaft tube 11 and the outer peripheral wall of the fixing portion 31, To fix the relative positions of the iron core 2 , the lower bearing seat 1 and the upper bearing seat 3 . Alternatively, an adhesive layer can also be formed between the inner peripheral wall of the iron core 2 and the outer peripheral wall of the shaft tube 11 and/or between the outer peripheral wall of the fixing portion 31 to elevate the iron core 2 and the lower The joint stability of the bearing seat 1 and the upper bearing seat 3 . The shaft tube 11 of the lower bearing seat 1 and the fixing portion 31 of the upper bearing seat 3 are preferably arranged at intervals in the axial direction, so that the bearing portion 34 can surely abut on the iron core 2 to form the second end 212 side. At the same time, the engaging shoulder 14 is formed by the lower bearing seat 1 , the bearing portion 34 is formed by the upper bearing seat 3 , the first end 211 and the second end 212 are respectively formed on both sides of the iron core 2 , the iron core Two sides of 2 can be seated on the joint shoulder 14 and the bearing portion 34 respectively, so that the lower bearing seat 1 , the iron core 2 and the upper bearing seat 3 are tightly integrated into one. The way of combining the three into one is as described above, which can be tight fitting, adhesive bonding, or both.

Referring to FIGS. 4 and 5 , the lower bearing seat 1 of the stator assembly may further have a third chamber 15 , and the third chamber 15 is formed in the first chamber 12 and the first chamber 15 in the axial direction. Between the inner spaces of the shaft tube 11 , and the third chamber 15 communicates with the first chamber 12 and the inner space of the shaft tube 11 . The third chamber 13 has a maximum radial width W7 , and the maximum radial width W7 is smaller than the maximum radial width W2 of the first chamber 12 . Thereby, the lower bearing seat 1 can be used for bearings 4 of different sizes, that is, if the size of the bearing 4 is larger, it can be assembled in the first chamber 12; It is smaller in size and can be assembled in the third chamber 15 .

Referring to FIG. 6 and FIG. 7 , the lower bearing seat 1 of the stator assembly may only have the first chamber 12 . As shown in FIG. 6 , the maximum radial width W2 of the first chamber 12 may be greater than the maximum radial width W3 of the combining channel 21, and the first chamber 12 is completely located outside the combining channel 21; or, as shown in FIG. As shown in FIG. 7 , the maximum radial width W2 of the first chamber 12 can also be set to be smaller than the maximum radial width W3 of the combining channel 21 , so that the first chamber 12 is partially located in the combining channel 21 .

Through the above structure, since the bearing portion 34 of the upper bearing seat 3 abuts against the side of the iron core 2 where the second end 212 is formed, the second bearing 5 can be stably supported and the second bearing 5 can be prevented from Movement relative to the iron core 2 occurs. In addition, since the lower bearing seat 1 and the upper bearing seat 3 are arranged separately, the timing of the rotor passing through the coupling channel 21 of the iron core 2 can be adjusted as required during the assembly process of the motor, so as to avoid the upper bearing seat 3 and the The departure of the second bearing 5 from the default position affects the structural stability of the stator assembly.

Please refer to FIG. 8 , which is a second embodiment of the stator assembly of the outer rotor motor of the present invention. Compared with the outer rotor motor stator assembly of the first embodiment, the first open end 13 of the lower bearing seat 1 of the present embodiment forms an inner top surface 131 and an outer top surface 132 along the radial direction of the shaft tube 11 . And the inner top surface 131 and the outer top surface 132 have a height difference in the axial direction of the shaft tube 11; in addition, the second open end 33 of the upper bearing seat 3 also forms an inner annular surface 331 and An outer annular surface 332, and the inner annular surface 331 and the outer annular surface 332 also have a height difference in the axial direction. The above-mentioned inner ring surface 331 faces the inner top surface 131, and the outer ring surface 332 faces the outer top surface 132; at the same time, the height difference between the inner top surface 131 and the outer top surface 132 is preferably in the radial direction It overlaps with the height difference between the inner annular surface 331 and the outer annular surface 332 . Specifically, in the axial direction, the outer annular surface 332 can protrude out of the inner annular surface 331 , and the inner top surface 131 can protrude out of the outer top surface 132 , so that the inner top surface 131 is located in the Between the inner annular surface 331 and the outer annular surface 332 , the fixing portion 31 is partially clamped between the shaft tube 11 and the iron core 2 . Alternatively, the inner annular surface 331 can also be set to protrude out of the outer annular surface 332 in the axial direction, and the outer top surface 132 can protrude out of the inner top surface 131, so that the outer top surface 132 is located at the Between the inner annular surface 331 and the outer annular surface 332 , the shaft tube 11 is partially clamped between the fixing portion 31 and the iron core 2 . In this way, the length of the upper bearing seat 3 extending into the combining channel 21 can be longer, so that the upper bearing seat 3 can be more firmly combined with the iron core 2 .

Please refer to FIG. 9 , which is a third embodiment of the stator assembly of the outer rotor motor of the present invention. Compared with the outer rotor motor stator assembly of the first embodiment, the first open end 13 of the lower bearing seat 1 of the present embodiment forms at least one first top surface 133 and at least one alternately disposed along the outer circumferential direction of the shaft tube 11 . A second top surface 134, and the first top surface 133 and the second top surface 134 have a height difference in the axial direction of the shaft tube 11; in addition, the second open ends 33 are also alternately arranged along the peripheral direction At least one tooth top surface 333 and at least one tooth bottom surface 334 , and the tooth top surface 333 and the tooth bottom surface 334 also have a height difference in the axial direction of the shaft tube 11 . The tooth top surface 333 faces the first top surface 133, and the tooth bottom surface 334 faces the second top surface 134; at the same time, the height difference between the first top surface 133 and the second top surface 134 is preferably The outer circumferential direction overlaps with the height difference between the tooth top surface 333 and the tooth bottom surface 334 . In this way, the length of the upper bearing seat 3 extending into the combining channel 21 can be longer, so that the upper bearing seat 3 can be more firmly combined with the iron core 2 .

Please refer to FIG. 10 , which is a fourth embodiment of the stator assembly of the outer rotor motor of the present invention. Compared with the outer rotor motor stator assembly of the first embodiment, the second open end 33 of the upper bearing seat 3 of the present embodiment has an outer guide slope 335 , and the outer guide slope 335 is in the radial direction of the shaft tube 11 . Set outward. Thereby, during the assembly process of the outer rotor motor stator assembly, the second open end 33 of the upper bearing seat 3 can be guided into the combining channel 21 more easily through the outer guide inclined surface 335 . In addition, the first open end 13 of the lower bearing seat 1 may also correspond to the shape of the outer guide inclined surface 335 of the second open end 33 , and be arranged to face inward in the radial direction, so as not to interact with the outer guide inclined surface 335 . The interference affects the effect of the upper bearing seat 3 abutting against the iron core 2 .

Please refer to FIG. 11 again, which is a fifth embodiment of the stator assembly of the outer rotor motor of the present invention. Compared with the outer rotor motor stator assemblies of the foregoing embodiments, the bearing portion 34 of the upper bearing seat 3 only has a ring bottom plate 341 , and an insulating sleeve 23 of the iron core 2 is partially located on the poles 221 and 22 of each excitation portion 22 . Between the windings 222 , and the insulating sleeve 23 forms a side wall portion 231 on the surface facing the upper bearing seat 3 , so that the ring bottom plate 341 of the bearing portion 34 and the side wall portion 231 together constitute the second chamber 32. Wherein, the insulating sleeve 23 is preferably combined with each pole 221 in a way of being integrally covered by plastic injection molding, so that the winding 222 can be wound around the outer surface thereof. In addition, the outer peripheral surface of the second bearing 5 is preferably flush with the outer peripheral surface of the ring bottom plate 341 , or slightly protrudes from the outer peripheral surface of the ring bottom plate 341 in the radial direction, so that the outer peripheral surface of the second bearing 5 can be stabilized ground to abut against the side wall portion 231 . Through the above structure, the structure of the upper bearing seat 3 can be simplified without affecting the assembly strength.

To sum up, the outer rotor motor stator assembly of the present invention can provide a bearing assembly structure that is more convenient to assemble. This structure can not only be used by the assembler to adjust the timing of the rotor passing through the coupling channel 21 of the iron core 2 as required during the motor assembly process, so as to prevent the upper bearing seat 3 and the second bearing 5 from leaving the default positions, and The first end 211 and the second end 212 are respectively formed by two sides of the iron core 2 , and the two sides of the iron core 2 are seated on the joint shoulder 14 and the bearing part 34 respectively, so that the lower bearing seat 1 , The iron core 2 and the upper bearing seat 3 can be tightly integrated into one, so that sufficient structural strength can still be provided for the stator assembly.

Claims (19)

1. An outer rotor motor stator assembly comprising:

the lower bearing seat is provided with an axle tube, a first accommodating chamber and a joint shoulder part, the first accommodating chamber is communicated with the inner space of the axle tube, and the joint shoulder part is arranged on the peripheral surface of the axle tube;

an iron core having a combining channel, wherein the iron core is combined with the lower bearing seat and is abutted against the joint shoulder; and

the upper bearing seat is provided with a fixed connection part, a second accommodating chamber and a bearing part, the second accommodating chamber is communicated with the inner space of the fixed connection part, and the bearing part is abutted to the iron core;

the method is characterized in that: the shaft tube and the fixed connection part extend into the combination channel from two ends of the combination channel respectively, the maximum radial width of the combination shoulder and the bearing part is larger than the maximum radial width of the combination channel, the lower bearing seat is provided with a third accommodating chamber, the third accommodating chamber is communicated with the first accommodating chamber and the inner space of the shaft tube, the maximum radial width of the third accommodating chamber is smaller than the maximum radial width of the first accommodating chamber, and the maximum radial width of the third accommodating chamber is larger than the maximum radial width of the inner space of the fixed connection part.

2. The external rotor motor stator assembly of claim 1, wherein: the maximum radial width of the first accommodating chamber and the second accommodating chamber is larger than the maximum radial width of the inner space of the fixed connection part.

3. The external rotor motor stator assembly of claim 1, wherein: the maximum radial width of the second chamber is larger than or equal to the maximum radial width of the first chamber.

4. The external rotor motor stator assembly of claim 1, wherein: the bearing assembly further comprises a first bearing and a second bearing, wherein the first bearing is arranged in the first accommodating chamber, the second bearing is arranged in the second accommodating chamber, and the outer diameter of the first bearing is not larger than that of the second bearing.

5. The external rotor motor stator assembly of claim 1, wherein: the bearing assembly further comprises a first bearing and a second bearing, wherein the first bearing is arranged in the third accommodating chamber, the second bearing is arranged in the second accommodating chamber, and the outer diameter of the first bearing is smaller than that of the second bearing.

6. An external rotor motor stator assembly as claimed in claim 4 or 5, wherein: the bearing part is provided with a ring bottom plate and a side wall, the ring bottom plate and the side wall form the second accommodating chamber, and the second bearing protrudes out of the side wall.

7. An external rotor motor stator assembly as claimed in claim 4 or 5, wherein: the bearing part is provided with a ring bottom plate and a side wall, the ring bottom plate and the side wall form the second accommodating chamber, and the second bearing is flush with the side wall.

8. An external rotor motor stator assembly as claimed in claim 4 or 5, wherein: the bearing part is provided with a ring bottom plate, the iron core is provided with an insulating sleeve, the insulating sleeve forms a side wall part on the surface facing the upper bearing seat, and the ring bottom plate and the side wall part jointly contain the second bearing.

9. The external rotor motor stator assembly of claim 1, wherein: the first chamber portion is located in the combining channel.

10. The external rotor motor stator assembly of claim 1, wherein: the first chamber is completely located outside the combining channel.

11. The external rotor motor stator assembly of claim 1, wherein: the lower bearing seat is provided with a first opening end, the first opening end is formed at one end of the shaft tube, and the first opening end is positioned in the combining channel.

12. The external rotor motor stator assembly of claim 1, wherein: the upper bearing seat is provided with a second opening end, the second opening end is formed at one end of the fixed connection part, and the second opening end is positioned in the combination channel.

13. The external rotor motor stator assembly of claim 1, wherein: the fixed connection part and the shaft tube are arranged at intervals in the axial direction of the shaft tube.

14. The external rotor motor stator assembly of claim 11, wherein: the upper bearing seat is provided with a second opening end, the second opening end is formed at one end of the fixed connection part, the second opening end is positioned in the combination passage, the first opening end forms an inner top surface and an outer top surface along a radial direction perpendicular to the axial direction of the shaft tube, the second opening end forms an inner ring surface and an outer ring surface along the radial direction, the inner ring surface faces the inner top surface, and the outer ring surface faces the outer top surface.

15. The external rotor motor stator assembly of claim 11, wherein: the upper bearing seat is provided with a second opening end, the second opening end is formed at one end of the fixed connection part, the second opening end is positioned in the combination channel, the first opening end forms at least one first top surface and at least one second top surface which are alternately arranged along the peripheral direction of the shaft tube, the second opening end forms at least one tooth top surface and at least one tooth bottom surface which are alternately arranged along the peripheral direction, wherein the tooth top surface faces the first top surface, and the tooth bottom surface faces the second top surface.

16. The external rotor motor stator assembly of claim 12, wherein: the second open end has an outer lead bevel.

17. The external rotor motor stator assembly of claim 1, wherein: the iron core forms the inner peripheral wall of the combination channel, and the inner peripheral wall of the combination channel is tightly matched and combined with the outer peripheral wall of the shaft tube and the outer peripheral wall of the fixed connection part.

18. An external rotor motor stator assembly as claimed in claim 1 or 17, wherein: the iron core forms the inner peripheral wall of the combination channel, and an adhesive layer is arranged between the inner peripheral wall of the combination channel and the outer peripheral wall of the shaft tube.

19. An external rotor motor stator assembly as claimed in claim 1 or 17, wherein: the iron core forms the inner peripheral wall of the combination channel, and an adhesive layer is arranged between the inner peripheral wall of the combination channel and the outer peripheral wall of the fixed connection part.

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