Bearing connection structure, stator assembly and brushless motor

Abstract

The utility model relates to the technical field of motors, and discloses a bearing connection structure, a stator assembly and a brushless motor, and the bearing connection structure comprises a stator skeleton and a bearing. A mounting cavity for mounting the rotor assembly is formed in the stator framework, and a bearing seat extends from the bottom of the stator framework; the bearing is integrally formed in the center of the bearing seat and used for being arranged on the rotor assembly in a sleeving mode. The bearing connection structure solves the problems that the overall structure is complex, so that the brushless motor is time-consuming to assemble, and the production cost is high; due to the fact that the number of components is large, the overall stability of the brushless motor is poor, and loosening is prone to occurring.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a bearing connection structure, a stator assembly and a brushless motor. Background Art

[0002] The brushless motor consists of an electric motor body and a driver. It is a typical mechatronic product. The brushless motor senses the position of the permanent magnet poles through electronic devices (such as Hall elements), switches the direction of the current in the coil at the right time, and ensures that the magnetic force in the correct direction is generated to drive the motor. It has the advantages of high reliability, no commutation sparks, and low mechanical noise. Brushless DC motors are widely used in automobiles, home appliances, industrial equipment and other fields due to their high efficiency and low maintenance.

[0003] In the related art, the brushless motor includes a rotor assembly, a stator assembly, an outer housing, a top cover, a bottom cover, a front bearing and a rear bearing. The stator assembly is sleeved on the rotor assembly, the outer housing is sleeved on the stator assembly, the top cover and the bottom cover are installed at the two ends of the outer housing away from the stator assembly, the top cover and the bottom cover are respectively provided with mounting holes for the front bearing and the rear bearing to be installed, and the front bearing and the rear bearing are used to be sleeved on the two ends of the rotor assembly to allow the rotor assembly to rotate more smoothly. Due to the relatively complex overall structure, the brushless motor is more time-consuming to assemble and has a higher production cost. At the same time, due to the large number of components, the overall stability of the brushless motor is relatively insufficient and it is more likely to become loose. Utility Model Content

[0004] In order to solve the deficiencies of the prior art, the utility model provides a bearing connection structure, a stator assembly and a brushless motor, which solve the problems that the brushless motor is time-consuming to assemble and has high production costs due to its relatively complex overall structure; and the brushless motor has insufficient overall stability and is more prone to loosening due to the large number of components.

[0005] The technical effects to be achieved by the utility model are achieved through the following aspects:

[0006] In a first aspect, the utility model provides a bearing connection structure, comprising:

[0007] A stator frame, wherein a mounting cavity for mounting a rotor assembly is formed inside the stator frame, and a bearing seat extends from the bottom of the stator frame; and

[0008] A bearing is integrally formed at the center of the bearing seat, and the bearing is used for being sleeved on the rotor assembly.

[0009] In some implementations, the bearing is mounted on a side of the bearing seat away from the mounting cavity.

[0010] In some implementations, a boss for abutting against the rotor assembly extends from a side of the bearing close to the bearing seat.

[0011] In this implementation, the rotor assembly is provided with a groove, and the boss abuts against the groove to prevent the rotor assembly from being offset during rotation, and the boss has a limiting effect on the rotor assembly.

[0012] In some implementations, the bearing includes an outer ring, an inner ring, and a retaining frame, wherein the outer ring, inner ring, and retaining frame are respectively connected to a side of the bearing seat away from the mounting cavity, and the inner ring is installed at the center of the outer ring and connected to the outer ring through the retaining frame.

[0013] In the second aspect, the utility model provides a stator assembly, including a center plate assembly and a first bearing connection structure and a second bearing connection structure respectively arranged on the two end surfaces of the center plate assembly, the first bearing connection structure and / or the second bearing connection structure are the above-mentioned bearing connection structures, and an avoidance hole is opened at the center of the center plate assembly, and together with the first bearing connection structure and the second bearing connection structure, an installation cavity for installing the rotor assembly is formed.

[0014] In some implementations, the first bearing connection structure and the second bearing connection structure are respectively provided with fixing blocks, and the intermediate plate assembly is also provided with fixing through holes, and the fixing blocks are respectively inserted into the fixing through holes to fix the first bearing connection structure and the second bearing connection structure.

[0015] In this implementation, the fixing blocks are respectively inserted into the fixing through holes to fix the first bearing connection structure and the second bearing connection structure, so that the first bearing connection structure and the second bearing connection structure are fixedly connected together through the intermediate plate assembly, thereby making the structure more stable. At the same time, when the rotor assembly fails, only the first bearing connection structure or the second bearing connection structure needs to be disassembled to repair or replace the rotor assembly, thereby improving the maintenance efficiency of the motor.

[0016] In some implementations, the intermediate plate assembly includes a first intermediate plate and a second intermediate plate, the first intermediate plate and the second intermediate plate are arranged in close contact with each other, and fixing members are respectively extended at one end of the first intermediate plate and the second intermediate plate facing away from each other, and the fixing members are respectively inserted into the installation cavity and respectively in contact with the inner circumferential wall of the first bearing connection structure and the second bearing connection structure.

[0017] In some implementations, a coil assembly is further included, and the middle sections of the first bearing connection structure and the second bearing connection structure are respectively formed with installation areas for installing the coil assembly, and the coil assembly is respectively wound in the installation areas.

[0018] In a third aspect, the utility model provides a brushless motor, comprising a housing assembly, a rotor assembly, and a stator assembly as described in any one of claims 1 to 4;

[0019] A device cavity for installing the stator assembly is formed inside the housing assembly, a device window is opened at the bottom of the housing assembly, the device window is connected to the device cavity, and the bearing seat and / or the bearing of the bearing connection structure protrudes and is fixed to the device window;

[0020] The rotor assembly is rotatably disposed in the stator assembly.

[0021] In some implementations, the shell assembly includes a first shell and a second shell, wherein one end of the second shell away from the device window is connected to the first shell, and a device cavity for installing the stator assembly is formed inside the first shell and the second shell.

[0022] In this implementation, it is easy to install or disassemble the stator assembly. When the stator assembly fails, it is only necessary to disassemble the first shell or the second shell to take out the stator assembly for repair or replacement, thereby improving the maintenance efficiency of the brushless motor.

[0023] Furthermore, the bearing seat is provided with a limiting through hole, and a limiting piece is formed at the periphery of the device window, and the limiting piece is inserted into the limiting through hole to fix the stator assembly.

[0024] In summary, the utility model has at least the following benefits:

[0025] The bearing connection structure provided by the utility model has a bearing seat extending from the bottom of the stator frame, and the bearing and the bearing seat are integrally formed, so that the brushless motor reduces the process during production and assembly, thereby reducing the production cost. At the same time, the integrally formed setting makes the motor more stable as a whole and not easy to loosen. The problem that the brushless motor is more time-consuming to assemble and has a higher production cost due to the complex overall structure and the brushless motor is less stable as a whole and is more prone to loosening due to the large number of components is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the bearing connection structure of some embodiments;

[0027] Figure 2 for Figure 1 A cross-sectional view of the bearing connection structure shown;

[0028] Figure 3 is a schematic structural diagram of a stator assembly of some embodiments;

[0029] Figure 4 for Figure 3 Another perspective structural schematic diagram of the stator assembly shown;

[0030] Figure 5 Schematic diagram of the structural relationship between the middle plate assembly and the first bearing connection structure and the second bearing connection structure in some embodiments;

[0031] Figure 6 Schematic diagram of the structural relationship between the coil assembly and the first bearing connection structure and the second bearing connection structure in some embodiments;

[0032] Figure 7 It is a schematic diagram of the structure of the brushless motor of some embodiments;

[0033] Figure 8 for Figure 7 A cross-sectional view of a brushless motor is shown.

[0034] Markings in the figure:

[0035] 10. Bearing connection structure; 11. First bearing connection structure; 12. Second bearing connection structure;

[0036] 100, stator frame; 101, installation cavity; 110, bearing seat; 111, limiting through hole;

[0037] 200, bearing; 210, boss; 220, outer ring; 230, inner ring; 240, cage;

[0038] 300, fixed block;

[0039] 400, installation area;

[0040] 20. Stator assembly;

[0041] 500, middle plate assembly; 501, avoidance hole; 502, fixing through hole; 510, first middle plate; 520, second middle plate; 521, fixing piece;

[0042] 600, coil assembly;

[0043] 30. Brushless motor;

[0044] 700, housing assembly; 701, device cavity; 702, device window; 7021, stopper; 710, first housing; 720, second housing;

[0045] 800. Rotor assembly; 801. Groove. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. The described implementation is a part of the implementation of the utility model, not all of the implementations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0048] Embodiment 1:

[0049] Please refer to the attached Figure 1~2 The bearing connection structure 10 of the utility model includes a stator frame 100 and a bearing 200 .

[0050] Please combine Figure 1 and Figure 2 , Figure 1 The structure relationship among the stator frame 100, the bearing seat 110 and the bearing 200 in the embodiment of the utility model is shown. Figure 2 The schematic diagram shows the structural relationship between the stator frame 100 and the rotor assembly 800 in the embodiment of the utility model. Specifically, a mounting cavity 101 for mounting the rotor assembly 800 is formed inside the stator frame 100, and a bearing seat 110 extends from the bottom of the stator frame 100; the bearing 200 is integrally formed at the center of the bearing seat 110, and the bearing 200 is used to be sleeved on the rotor assembly 800.

[0051] Specifically, the stator frame 100 is usually made of iron core material, and its function is to support the stator coils so that they can be fixed in the appropriate position and ensure that the position of the stator coils is accurate. At the same time, the stator frame 100 can also transmit torque and provide positioning of the rotor assembly 800. In this embodiment, the rotor assembly 800 is installed in the installation cavity 101 of the stator frame 100 and is penetrated by the bearing 200. Because the bearing 200 and the bearing seat 110 are integrally formed at the bottom of the stator frame 100, the brushless motor 30 only needs to install the rotor assembly 800 in the installation cavity 101 and penetrate the bearing 200 during assembly, and the motor stator assembly 20, the rotor assembly 800 and the bearing 200 can be assembled, which reduces the installation process of the motor top cover, bottom cover and front and rear bearings 200, thereby reducing the manufacturing process of the brushless motor 30 during production and reducing production costs.

[0052] The above-mentioned bearing connection structure 10, since the bearing seat 110 extends from the bottom of the stator frame 100, and the bearing 200 and the bearing seat 110 are integrally formed, reduces the number of steps in the production and assembly of the brushless motor 30, thereby reducing the production cost. At the same time, the integrally formed setting makes the motor more stable as a whole and less likely to loosen. This solves the problem that the assembly of the brushless motor 30 is time-consuming and the production cost is high due to the complex overall structure; and the overall stability of the brushless motor 30 is insufficient and it is more likely to loosen due to the large number of components.

[0053] In some preferred embodiments, the bearing 200 is installed on the side of the bearing seat 110 away from the installation cavity 101. This makes it possible for the rotor assembly 800 to not generate friction with the cross section of the bearing 200 when rotating, thereby reducing the resistance encountered by the rotor assembly 800 when rotating, and also improving the service life of the bearing 200. Furthermore, the structure of the rotor assembly 800 and the stator frame 100 is made more compact, reducing the space occupied by the overall structure.

[0054] In some preferred embodiments, see Figure 2 , Figure 2 The diagram shows the structural relationship between the boss 210 and the groove 801 in the embodiment of the utility model. Specifically, the boss 210 for abutting the rotor assembly 800 extends from one side of the bearing 200 close to the bearing seat 110. The rotor assembly 800 is provided with a groove 801, and the boss 210 abuts against the groove 801 to prevent the rotor assembly 800 from deflecting during the rotation process. The boss 210 has a limiting effect on the rotor assembly 800.

[0055] In some more preferred embodiments, see Figure 1 , Figure 1 The specific structure of the bearing 200 in the embodiment of the utility model is illustrated. Specifically, the bearing 200 includes an outer ring 220, an inner ring 230 and a retaining frame 240, the outer ring 220, the inner ring 230 and the retaining frame 240 are respectively connected to the side of the bearing seat 110 away from the installation cavity 101, the inner ring 230 is installed at the center of the outer ring 220, and is connected to the outer ring 220 through the retaining frame 240.

[0056] Specifically, the bearing 200 reduces the friction between the rotor assembly 800 and the stator frame 100, thereby making the rotor assembly 800 rotate more smoothly and reducing energy consumption. In this embodiment, the retaining frame 240 reduces the friction and heat generated when the rotor assembly 800 rotates, thereby increasing the service life of the bearing 200. Furthermore, the problem of the rotor assembly 800 rotating out of position due to overload is also avoided.

[0057] Embodiment 2:

[0058] This embodiment provides a stator assembly 20 based on the above embodiment. Figures 3 to 6 .

[0059] See also Figure 3 , Figure 3 The specific structure of the stator assembly 20 in the embodiment of the utility model is illustrated. Specifically, a stator assembly 20 includes a center plate assembly 500 and a first bearing connection structure 11 and a second bearing connection structure 12 respectively arranged on both end surfaces of the center plate assembly 500, and the first bearing connection structure 11 and / or the second bearing connection structure 12 are the bearing connection structure 10 of embodiment 1.

[0060] A avoidance hole 501 is provided at the center of the intermediate plate assembly 500 , and together with the first bearing connection structure 11 and the second bearing connection structure 12 , forms an installation cavity 101 for installing the rotor assembly 800 .

[0061] In this embodiment, the middle plate assembly 500 and the first bearing connection structure 11 and the second bearing connection structure 12 form a mounting cavity 101, and the rotor assembly 800 is installed in the mounting cavity 101, which avoids the rotor assembly 800 from scratching with external equipment when rotating, thereby causing wear or failure. At the same time, the structure of the stator assembly 20 and the rotor assembly 800 is compact. Furthermore, the middle plate assembly 500 is arranged between the first bearing connection structure 11 and the second bearing connection structure 12, and plays a role in magnetic conduction.

[0062] In some preferred embodiments, please combine Figure 3 and Figure 4 , Figure 3 and Figure 4 The structural relationship between the fixing block 300 and the fixing through hole 502 in the embodiment of the utility model is illustrated. Specifically, the first bearing connection structure 11 and the second bearing connection structure 12 are respectively provided with fixing blocks 300, and the intermediate plate assembly 500 is also provided with fixing through holes 502, and the fixing blocks 300 are respectively inserted into the fixing through holes 502 to fix the first bearing connection structure 11 and the second bearing connection structure 12. The first bearing connection structure 11 and the second bearing connection structure 12 are fixedly connected together through the intermediate plate assembly 500, thereby making the structure more stable. At the same time, when the rotor assembly 800 fails, the rotor assembly 800 can be repaired or replaced by simply disassembling the first bearing connection structure 11 or the second bearing connection structure 12, thereby improving the maintenance efficiency of the motor.

[0063] In some preferred embodiments, please refer to Figure 5 , Figure 5The diagram shows the structural relationship between the intermediate plate assembly 500 and the first bearing connection structure 11 and the second bearing connection structure 12 in the embodiment of the utility model. Specifically, the intermediate plate assembly 500 includes a first intermediate plate 510 and a second intermediate plate 520, which are arranged in close contact with each other. The first intermediate plate 510 and the second intermediate plate 520 have fixing members 521 extending from one end of each other, and the fixing members 521 are respectively inserted into the installation cavity 101 and are respectively in close contact with the inner circumferential wall of the first bearing connection structure 11 and the second bearing connection structure 12. While not interfering with the normal rotation of the rotor assembly 800, the connection between the first intermediate plate 510 and the first bearing connection structure 11 and between the second intermediate plate 520 and the second bearing connection structure 12 is made more stable, so as to avoid the motor from loosening when rotating, thereby affecting the normal operation of the motor.

[0064] It can be understood that the first intermediate plate 510 and the first bearing connection structure 11 , and the second intermediate plate 520 and the second bearing connection structure are not limited to being plugged together, but may also be integrally formed.

[0065] In some more preferred embodiments, please refer to Figure 6 , Figure 6 The schematic diagram shows the structural relationship between the coil assembly 600 and the first bearing connection structure 11 and the second bearing connection structure 12 in the embodiment of the utility model. Specifically, the coil assembly 600 is also included, and the middle sections of the first bearing connection structure 11 and the second bearing connection structure 12 are respectively formed with installation areas 400 for installing the coil assembly 600, and the coil assembly 600 is respectively wound in the installation area 400. The coil assembly 600 is made flush with both ends of the first bearing connection structure 11 and the second bearing connection structure 12, respectively, to avoid the problem that the coil assembly 600 protrudes from the first bearing connection structure 11 and / or the second bearing connection structure 12 and rubs against external equipment, thereby causing wear and tear, thereby protecting the coil assembly 600. Furthermore, the structure of the stator assembly 20 is made more compact, reducing the occupied space.

[0066] Embodiment 3:

[0067] This embodiment provides a brushless motor 30 based on the above embodiment. Figure 7-8 , Figure 7 and Figure 8 The specific structure of the brushless motor in the embodiment of the utility model is illustrated.

[0068] Specifically, a brushless motor 30 includes a housing assembly 700 , a rotor assembly 800 and a stator assembly 20 .

[0069] Among them, a device cavity 701 for installing the stator assembly 20 is formed inside the shell assembly 700, and a device window 702 is opened at the bottom of the shell assembly 700. The device window 702 is connected to the device cavity 701, and the bearing seat 110 and / or the bearing 200 of the bearing connection structure 10 protrude and are fixed to the device window 702; the rotor assembly 800 is rotatably arranged in the stator assembly 20.

[0070] In this embodiment, the stator assembly 20 is installed in the device cavity 701, and the housing assembly 700 protects the stator assembly 20, thereby preventing the stator assembly 20 from being scratched and worn by external equipment. Furthermore, the structure of the brushless motor 30 is made more compact. The bearing seat 110 and / or the bearing 200 protrude and are fixed to the device window 702 at the bottom of the housing assembly 700, so that the housing assembly 700 fits the stator assembly 20 more closely, plays a better protective role, and compresses the space occupied by the brushless motor 30, thereby making the brushless motor 30 more suitable for equipment with a smaller installation space.

[0071] In some preferred embodiments, the housing assembly 700 includes a first housing 710 and a second housing 720, one end of the second housing 720 away from the device window 702 is connected to the first housing 710, and the first housing 710 and the second housing 720 together form a device cavity 701 for installing the stator assembly 20. It is convenient to install or remove the stator assembly 20. When the stator assembly 20 fails, only the first housing 710 or the second housing 720 needs to be removed to remove the stator assembly 20 for repair or replacement, thereby improving the maintenance efficiency of the brushless motor 30. It can be understood that in some other embodiments, the first housing 710 and the second housing 720 are an integrally formed structure.

[0072] In some more preferred embodiments, the bearing seat 110 is provided with a limiting through hole 111, and a limiting member 7021 is formed at the periphery of the device window 702, and the limiting member 7021 is inserted into the limiting through hole 111 to fix the stator assembly 20. This makes the connection between the housing assembly 700 and the stator assembly 20 more fixed, avoids the stator assembly 20 from deflecting when the motor rotates, and further ensures the normal operation of the motor.

[0073] The brushless motor 30 of the utility model has a bearing seat 110 extending from the bottom of the stator frame 100, and the bearing 200 and the bearing seat 110 are integrally formed, so that the brushless motor 30 reduces the number of processes during production and assembly, thereby reducing the production cost. At the same time, the integrally formed setting makes the motor more stable as a whole and less likely to loosen. This solves the problem that the assembly of the brushless motor 30 is time-consuming and the production cost is high due to the complex overall structure; and the overall stability of the brushless motor 30 is insufficient and it is more likely to loosen due to the large number of components.

[0074] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0076] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0077] In the present utility model, unless otherwise clearly specified and limited, a feature being above or below a second feature may include being in direct contact with the second feature, or may include being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a feature being above, above, and above the second feature includes being directly above and obliquely above the second feature, or simply means that the feature is higher in level than the second feature. A feature being below, below, and below the second feature includes being directly below and obliquely below the second feature, or simply means that the feature is lower in level than the second feature.

[0078] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A bearing connection structure, characterized in that: include: A stator frame (100) having an installation cavity (101) formed therein for installing a rotor assembly (800), and a bearing seat (110) extending from the bottom of the stator frame (100); and A bearing (200) is integrally formed at the center of the bearing seat (110), and the bearing (200) is used to be sleeved on the rotor assembly (800).

2. The bearing connection structure according to claim 1, characterized in that: The bearing (200) is installed on a side of the bearing seat (110) away from the installation cavity (101).

3. The bearing connection structure according to claim 2, characterized in that: A boss (210) for abutting against the rotor assembly (800) extends from one side of the bearing (200) close to the bearing seat (110).

4. The bearing connection structure according to claim 1, characterized in that: The bearing (200) comprises an outer ring (220), an inner ring (230) and a retaining frame (240); the outer ring (220), the inner ring (230) and the retaining frame (240) are respectively connected to a side of the bearing seat (110) away from the mounting cavity (101); the inner ring (230) is installed at the center of the outer ring (220) and is connected to the outer ring (220) via the retaining frame (240).

5. A stator assembly, characterized in that: The invention comprises a center plate assembly (500) and a first bearing connection structure (11) and a second bearing connection structure (12) respectively arranged on both end surfaces of the center plate assembly (500), wherein the first bearing connection structure (11) and / or the second bearing connection structure (12) is a bearing connection structure (10) according to any one of claims 1 to 4, and an avoidance hole (501) is provided at the center of the center plate assembly (500), and together with the first bearing connection structure (11) and the second bearing connection structure (12), forms an installation cavity (101) for installing the rotor assembly (800).

6. The stator assembly according to claim 5, characterized in that The first bearing connection structure (11) and the second bearing connection structure (12) are respectively provided with a fixing block (300), and the intermediate plate assembly (500) is further provided with a fixing through hole (502), and the fixing blocks (300) are respectively inserted into the fixing through holes (502) to fix the first bearing connection structure (11) and the second bearing connection structure (12).

7. The stator assembly according to claim 5 or 6, characterized in that: The intermediate plate assembly (500) comprises a first intermediate plate (510) and a second intermediate plate (520), the first intermediate plate (510) and the second intermediate plate (520) being arranged in close contact with each other, and fixing members (521) are respectively extended from one end of the first intermediate plate (510) and the other end of the second intermediate plate (520) which are away from each other, and the fixing members (521) are respectively inserted into the installation cavity (101) and respectively in close contact with the inner peripheral wall of the first bearing connection structure (11) and the second bearing connection structure (12).

8. The stator assembly according to claim 5, characterized in that It also comprises a coil assembly (600), wherein the middle sections of the first bearing connection structure (11) and the second bearing connection structure (12) are respectively formed with installation areas (400) for installing the coil assembly (600), and the coil assembly (600) is respectively wound in the installation areas (400).

9. A brushless motor, characterized in that: It comprises a housing assembly (700), a rotor assembly (800), and a stator assembly (20) according to any one of claims 5 to 8; An installation cavity (701) for installing the stator assembly (20) is formed inside the housing assembly (700), a installation window (702) is provided at the bottom of the housing assembly (700), the installation window (702) is connected to the installation cavity (701), and the bearing seat (110) and / or the bearing (200) of the bearing connection structure (10) protrude and are fixed to the installation window (702); The rotor assembly (800) is rotatably disposed in the stator assembly (20).

10. The brushless motor according to claim 9, characterized in that: The housing assembly (700) comprises a first housing (710) and a second housing (720); an end of the second housing (720) away from the device window (702) is connected to the first housing (710); and a device cavity (701) for mounting the stator assembly (20) is formed inside the first housing (710) and the second housing (720).

11. The brushless motor according to claim 9, characterized in that: The bearing seat (110) is provided with a limiting through hole (111), and a limiting piece (7021) is formed at the periphery of the device window (702), and the limiting piece (7021) is inserted into the limiting through hole (111) to fix the stator assembly (20).

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