Brushless motor with variable eccentric radius and eccentric distance adjusting method

Abstract

The invention discloses a variable-eccentric-radius brushless motor and an eccentric distance adjusting method, and relates to the technical field of brushless outer rotor motors, the variable-eccentric-radius brushless motor comprises a rotor set, a stator set, an eccentric assembly and an adjusting mechanism, the rotor set is provided with a motor shell, and the motor shell is provided with a rotating center shaft which is integrally connected; the adjusting mechanism is provided with an adjusting shaft, and the adjusting shaft can be movably arranged in the rotating center shaft in a clearance fit mode in the axial direction of the rotating center shaft; the eccentric assembly can be rotatably mounted on the motor shell along with the motor shell; the adjusting shaft moves in the axial direction of the rotating center shaft to drive the eccentric end of the eccentric assembly to be close to or away from the rotating center shaft. The eccentric radius is adjusted by adopting the eccentric assembly and the adjusting mechanism, so that the applicability is wider; the motor shell is provided with the rotating center shaft which is integrally connected, so that the concentricity and the perpendicularity of the motor shell and the rotating center shaft are improved; by adopting the eccentric assembly, the motor has eccentric force and eccentric torque.

Description

Technical Field

[0001] The invention relates to the field of brushless outer rotor motor technology, in particular to a brushless motor with a variable eccentric radius and an eccentricity adjustment method. Background Art

[0002] The fascia gun motors on the market do not have their own eccentric wheel (crank) structure, and all need to be assembled with eccentric wheel (crank) parts and radius adjustment moving parts; and most eccentric wheels cannot adjust the eccentric radius, and the parts need a large space to fix and assemble each other, and the accumulated tolerance of the assembly process seriously affects the movement stability and noise of the fascia gun; some fascia guns with adjustable eccentric wheel radius are post-installed, that is, the motor is fixed to the fascia gun housing before the eccentric wheel and eccentric radius adjustment part are assembled. When an abnormality occurs in the assembly process, the whole machine needs to be disassembled and repaired, which is not conducive to the production of fascia guns; from the perspective of end users, fascia guns with unchangeable eccentric radius can only maintain the same stroke movement, and the muscle distribution and fascia layer depth of different parts of the human body are different, such as the thighs, hands, and buttocks. The muscle thickness is different, so the fascia layer depth is also different; therefore, the striking stroke needs to be changed for different levels of fascia layers; and the motors on the market do not have eccentric wheels (cranks) and adjustable eccentric radius structures.

[0003] Transmission eccentric motors are mostly split type: that is, an eccentric wheel is added to the brushless motor to generate eccentric force, and the eccentric wheel is used to connect the piston component to form a massage tool or electric tool; the disadvantages of this method: increased cost of the eccentric wheel; increased instability and consistency after assembly; the eccentric radius is fixed and cannot be changed; this reduces the convenience of assembly and the user's controllability and needs; the motor used for fascia guns in the prior art does not use eccentric components and adjustment mechanisms to achieve eccentric radius adjustment, and the scope of application is limited; the motor housing is not integrally connected to the rotating center axis, which is not convenient for ensuring the concentricity and verticality of the motor housing and the rotating center axis, and the stability of the motor operation is poor; therefore, in view of this situation, there is an urgent need to develop a brushless motor with a variable eccentric radius and an eccentricity adjustment method to meet the needs of actual use. Summary of the invention

[0004] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a brushless motor with a variable eccentric radius and an eccentricity adjustment method, which achieves the adjustment of the eccentric radius by adopting an eccentric component and an adjustment mechanism, and has a wider applicability; the motor housing has an integrally connected rotating center axis, and the secondary connection between the outer rotor housing and the rotating center axis of the motor is eliminated in the process, thereby improving the concentricity and verticality of the motor housing and the rotating center axis, reducing the risk of secondary connection, and improving the stability of the motor operation.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A brushless motor with a variable eccentric radius comprises a rotor group, a stator group, an eccentric assembly and an adjusting mechanism, wherein the rotor group is rotatably matched with the stator group; the rotor group has a motor housing, and the motor housing has an integrally connected rotating center axis; the adjusting mechanism has an adjusting shaft, and the adjusting shaft can be axially movable along the rotating center axis and loosely fitted in the rotating center axis; the eccentric assembly can be rotatably installed on the motor housing along with the motor housing; the adjusting shaft moves along the axial direction of the rotating center axis to drive the eccentric end of the eccentric assembly to approach or move away from the rotating center axis.

[0007] As a preferred solution: the eccentric assembly includes an eccentric movable block and an eccentric support, the eccentric support is rotatably mounted on the upper end of the adjusting shaft, the eccentric movable block is wedge-fitted with the eccentric support, and the eccentric movable block can be moved closer to or away from the rotating center axis; the eccentric end of the eccentric assembly is the eccentric movable block; the rotating center axis is a hollow structure, and the adjusting shaft is gap-fitted in the hollow structure of the rotating center axis.

[0008] As a preferred solution: the eccentric assembly also includes a slide rail for guiding the eccentric movable block, the slide rail is arranged on the upper side of the motor housing, the eccentric movable block slides with the slide rail, a first slot is penetrated on the eccentric movable block, a second slot is penetrated on the upper side of the motor housing, and the slide rail penetrates the first slot and the second slot; a positioning hole for positioning the slide rail is provided on the upper side of the motor housing; the eccentric movable block has an inclined rod, and the eccentric support has an inclined groove matching the inclined rod.

[0009] As a preferred solution: the adjustment mechanism also includes an adjustment block that can rotate forward or reverse, the adjustment block is rotationally matched with the lower end of the adjustment shaft, and the adjustment block rotates to drive the adjustment shaft to move axially along the rotation center axis.

[0010] As a preferred solution: the adjusting block is rotationally matched with the lower end of the adjusting shaft via a thread or a rotating slot.

[0011] As a preferred solution: a limit block for preventing the adjustment shaft from rotating is arranged above the adjustment block, and the limit block is sleeved on the outside of the adjustment shaft; the limit block abuts against the lower end of the rotating central shaft.

[0012] As a preferred solution: the side wall of the adjusting shaft is set to be flat, D-shaped or grooved, and the limit block is provided with a special-shaped hole matching the flat, D-shaped or grooved.

[0013] As a preferred solution: a limit plate is provided on the lower side of the adjusting block to ensure that the adjusting block cannot move axially along the rotation center axis, and the adjusting block can only make radial rotational movement along the rotation center axis, and the limit plate is sleeved on the lower side of the adjusting block; a limit step is provided on the adjusting block for abutting against the limit plate, and the upper surface of the limit plate abuts against the limit step.

[0014] As a preferred solution: the stator group includes a winding stator, a first bearing, a driving PCB board, a stator fixing frame and a second bearing, the winding stator and the driving PCB board are both arranged on the stator fixing frame, the outer ring of the first bearing and the outer ring of the second bearing are both fixed on the stator fixing frame, and the inner ring of the first bearing and the inner ring of the second bearing are both fixed on the rotating center axis of the motor housing; the driving PCB board is provided with indicator lights for displaying GND, NTC, PWM and FG.

[0015] The eccentricity adjustment method of the brushless motor with variable eccentric radius comprises the following steps:

[0016] First, the adjusting block rotates forward or reversely, and the adjusting shaft moves axially (upward / downward) along the rotation center axis by rotating the adjusting block;

[0017] Second, the axial movement of the adjusting shaft along the rotating center axis drives the eccentric support to move along the axial direction of the rotating center axis;

[0018] Third, the eccentric support moves and pushes the eccentric movable block to slide on the slide rail, so that the eccentric movable block approaches or moves away from the rotation center axis, thereby changing the eccentric radius or eccentric distance.

[0019] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that:

[0020] First, the eccentric radius can be adjusted by using an eccentric component and an adjusting mechanism, which has a wider applicability.

[0021] Second, the motor housing has an integrally connected rotating center axis, which eliminates the secondary connection between the outer rotor housing and the motor rotating center axis, such as welding and riveting, and replaces it with an integral molding of the motor housing and the rotating center axis, thereby improving the concentricity and verticality of the motor housing and the rotating center axis, reducing the vibration and wear of the motor, reducing the risk of secondary connection, and improving the stability of the motor operation.

[0022] Third, by adopting the eccentric component, the motor has its own eccentric force and eccentric torque, and because the eccentric component is arranged in the same direction of the motor housing, it can ensure that the eccentric component and the motor housing start synchronously when the motor rotates, reducing the torque loss caused by the asynchronous eccentric wheel when the motor starts.

[0023] Fourth, by adopting the limit block, it is ensured that the adjustment shaft will not rotate synchronously or along the rotation center axis; by adopting the limit plate, it is ensured that the adjustment block cannot move axially along the rotation center axis, and the adjustment block can only make radial rotational motion along the rotation center axis, thereby ensuring accuracy.

[0024] In order to more clearly illustrate the structural features and effects of the present invention, it is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the variable eccentric radius brushless motor of the present invention from a first perspective;

[0026] Figure 2 A schematic diagram of the three-dimensional structure of the variable eccentric radius brushless motor of the present invention from a second viewing angle;

[0027] Figure 3 This is an exploded view of the variable eccentric radius brushless motor of the present invention;

[0028] Figure 4 A cross-sectional view of a brushless motor with a variable eccentric radius according to the present invention;

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the eccentric component of the present invention;

[0030] Figure 6 It is a schematic diagram of the three-dimensional structure of the eccentric assembly and the adjusting shaft of the present invention;

[0031] Figure 7 It is a schematic diagram of the three-dimensional structure of the eccentric assembly and the adjustment mechanism of the present invention;

[0032] Figure 8 It is an exploded view of the eccentric assembly and the motor housing of the present invention;

[0033] Fig. 9 This is an exploded view of the eccentric support and the adjustment shaft of the present invention;

[0034] Fig.10 It is an exploded view of the rotor assembly and the stator assembly of the present invention;

[0035] Fig.11 It is a schematic diagram of the three-dimensional structure of the motor housing of the present invention;

[0036] Fig.12 It is a schematic diagram of the three-dimensional structure of the adjustment block, the limit block and the limit plate of the present invention;

[0037] Fig.13 It is a schematic diagram of the three-dimensional structure of the limiting block of the present invention.

[0038] Description of the accompanying drawings:

[0039] In the figure: 10, rotor assembly; 11, motor housing; 111, second slot; 112, hollow structure; 113, positioning hole; 12, rotating center axis; 20, stator assembly; 21, winding stator; 22, first bearing; 23, drive PCB board; 231, indicator light; 24, stator fixing frame; 25, second bearing; 30, eccentric assembly; 31, eccentric movable block; 311, inclined rod; 312, first slot; 32, eccentric support; 321, inclined slot; 33, slide rail; 40, adjustment mechanism; 41, adjustment shaft; 411, bearing; 42, adjustment block; 421, limit step; 43, limit block; 431, special-shaped hole; 44, limit plate. DETAILED DESCRIPTION

[0040] The present invention Figures 1 to 13 As shown, a brushless motor with a variable eccentric radius and an eccentricity adjustment method, the brushless motor with a variable eccentric radius comprises a rotor assembly 10, a stator assembly 20, an eccentric assembly 30 and an adjustment mechanism 40, wherein:

[0041] The rotor group 10 is rotatably matched with the stator group 20; the rotor group 10 has a motor housing 11, and the motor housing 11 has an integrally connected rotating center axis 12; the adjustment mechanism 40 has an adjustment shaft 41, and the adjustment shaft 41 can be axially movable and clearance-fitted in the rotating center axis 12 along the axial direction of the rotating center axis; the eccentric component 30 can be rotatably installed on the motor housing 11 along with the motor housing 11; the adjustment shaft 41 moves along the axial direction of the rotating center axis to drive the eccentric end of the eccentric component 30 to approach or move away from the rotating center axis 12.

[0042] The eccentric assembly 30 includes an eccentric movable block 31 and an eccentric support 32. The eccentric support 32 is rotatably mounted on the upper end of the adjusting shaft 41. The eccentric movable block 31 is wedge-fitted with the eccentric support 32. The eccentric movable block 31 is movable toward or away from the rotating center shaft 12. The eccentric end of the eccentric assembly 30 is the eccentric movable block 31. The rotating center shaft 12 is a hollow structure 112. The adjusting shaft 41 is clearance-fitted in the hollow structure 112 of the rotating center shaft 12.

[0043] A bearing 411 is provided between the eccentric support 32 and the adjusting shaft 41. The eccentric support 32 is rotatably sleeved on the upper end of the adjusting shaft 41 through the bearing 411; the bearing 411 is pressed into the eccentric support 32, and then installed into the step position at the front end of the adjusting shaft 41, and is fixed by screwing it into the hole at the front end of the adjusting shaft 41.

[0044] The eccentric movable block 31 can rotate with the motor housing 11. When the center of the eccentric movable block 31 is far away from the rotation center axis 12, the eccentric rotation radius becomes larger; the eccentric movable block 31 can rotate with the motor housing 11. When the center of the eccentric movable block 31 is close to the rotation center axis 12, the eccentric rotation radius becomes smaller.

[0045] The eccentric assembly 30 also includes a slide rail 33 for guiding the eccentric movable block 31. The slide rail 33 is arranged on the upper side of the motor housing 11, and the eccentric movable block 31 slides with the slide rail 33; a first slot 312 is penetrated through the eccentric movable block 31, a second slot 111 is penetrated through the upper side of the motor housing 11, and the slide rail 33 penetrates the first slot 312 and the second slot 111; a positioning hole 113 for positioning the slide rail 33 is provided on the upper side of the motor housing 11; the eccentric movable block 31 has an inclined rod 311, and the eccentric support 32 has an inclined slot 321 matching the inclined rod 311.

[0046] The movement relationship between the adjusting shaft 41 and the eccentric movable block 31 is described as follows: the movement directions of the adjusting shaft 41 are A and B; the movement directions of the eccentric movable block 31 are A1 and B1; when the adjusting shaft 41 moves in the A direction, the eccentric movable block 31 moves along the slide rail 33 to approach the rotation center axis 12, that is, the eccentric movable block 31 moves in the A direction; when the adjusting shaft 41 moves in the B direction, the eccentric movable block 31 moves along the slide rail 33 away from the rotation center axis 12, that is, the eccentric movable block 31 moves in the B direction.

[0047] The adjusting mechanism 40 also includes an adjusting block 42 which can rotate forward or reverse. The adjusting block 42 is rotationally matched with the lower end of the adjusting shaft 41. The adjusting block 42 rotates to drive the adjusting shaft 41 to move axially along the rotation center axis. The adjusting block 42 is rotationally matched with the lower end of the adjusting shaft 41 through a thread or a rotating groove. The rotating groove can be a threaded rotating groove to ensure the rotation of the adjusting block.

[0048] A limit block 43 is provided above the adjusting block 42 to prevent the adjusting shaft 41 from rotating. The limit block 43 is sleeved on the outer side of the adjusting shaft 41. The limit block 43 abuts against the lower end of the rotating center shaft 12. The limit block 43 is used to prevent the adjusting shaft 41 from rotating synchronously or along the rotating center shaft 12. The side wall of the adjusting shaft 41 is set to a flat position, a D-type or a groove type, and the limit block 43 is provided with a special-shaped hole 431 matching the flat position, the D-type or the groove type. The lower side of the adjusting block 42 is provided with a hole for ensuring that the adjusting block 42 A limit plate 44 cannot move axially along the rotating center axis 12, and the adjusting block 42 can only make radial rotational movement along the rotating center axis 12. The limit plate 44 is sleeved on the lower side of the adjusting block 42; a limit step 421 for abutting against the limit plate 44 is provided on the adjusting block 42, and the upper surface of the limit plate 44 abuts against the limit step 421; by rotating the adjusting block 42 forward / reverse, under the action of the thread (or rotating groove), the adjusting shaft 41 is moved in the A direction or the B direction along the axial direction of the rotating center axis.

[0049] The stator assembly 20 includes a winding stator 21, a first bearing 22, a driving PCB board 23, a stator fixing frame 24 and a second bearing 25. The winding stator 21 and the driving PCB board 23 are both arranged on the stator fixing frame 24. The outer ring of the first bearing 22 and the outer ring of the second bearing 25 are both fixed on the stator fixing frame 24. The inner ring of the first bearing 22 and the inner ring of the second bearing 25 are both fixed on the rotating central axis 12 of the motor housing 11. An indicator light 231 for displaying GND, NTC, PWM and FG is provided on the driving PCB board 23. When the motor housing 11 rotates, the inner ring of the first bearing 22 and the inner ring of the second bearing 25 rotate together.

[0050] This patent integrates the motor, eccentric wheel, and the motion and transmission components with adjustable eccentric radius into a whole, which effectively saves the internal space size of the fascia gun and improves the assembly accuracy and motion stability of the fascia gun during assembly; the motor of this patent can be regarded as a motor module when used on the fascia gun, which is directly assembled on the fascia gun housing. Compared with the after-installed eccentric wheel and eccentric radius adjustment structure, it reduces the assembly and maintenance costs of the fascia gun; for the majority of fascia gun manufacturers, this patent solution can provide a motor with an adjustable fascia gun hammering (piston movement stroke) stroke, without the need to design and assemble adjustable transmission components separately, and solves a series of problems such as the space size, assembly maintenance, and cost increase of the after-installed design.

[0051] Compared with the traditional motor, the motor rotating shaft is eliminated (because its rotating center shaft 12 and the motor housing 11 are integrated), and the space in the center of the motor is effectively used for adjusting the eccentric component 30, and the adjusting shaft 41 cannot rotate (radial and circumferential movement), but can only move axially along the rotating center shaft; it forms a dynamic and static structure with the motor rotor group 10, which do not affect or interfere with each other; (the adjustment method of the adjusting shaft 41 in the center of the motor can be manual or electric).

[0052] The present application has the following advantages: the motor housing 11 has its own eccentric counterweight; there is no need to install an eccentric wheel afterwards; the eccentric radius is adjustable, and the applicability is wider. When operating, the user can adjust the movement length of the piston according to different massage requirements, thereby changing the depth of the massage blow; or when drilling, the eccentric radius can be adjusted according to different thickness and depth requirements to improve the striking efficiency; it is suitable for fascia guns or electric hammers.

[0053] The eccentricity adjustment method of the brushless motor with variable eccentric radius comprises the following steps:

[0054] First, the adjusting block rotates forward or reversely, and the adjusting shaft moves axially (upward / downward) along the rotation center axis by rotating the adjusting block;

[0055] Second, the axial movement of the adjusting shaft along the rotating center axis drives the eccentric support to move along the axial direction of the rotating center axis;

[0056] Third, the eccentric support moves and pushes the eccentric movable block to slide on the slide rail, so that the eccentric movable block approaches or moves away from the rotation center axis, thereby changing the eccentric radius or eccentric distance.

[0057] The usage and principle of the variable eccentric radius brushless motor are as follows:

[0058] The driving PCB board 23 is connected to the external power supply (VCC and GND) and energized; the winding stator 21 (enameled wire or insulated copper wire is wound on the silicon steel sheet group) forms multiple pairs of electrode windings; the annular permanent magnet or magnet group is fixed in the motor housing 11; the motor housing 11 and the stator fixing frame 24 are connected and assembled through the first bearing 22 and the second bearing 25; when the external power supply is connected, the driving PCB board 23 is used to alternately energize the electrode windings in the winding stator 21 so that it generates opposite magnetic attraction with the magnet or magnetic ring on the rotor group 10, During the alternating power-on adsorption process, the rotor group 10 is pulled and driven to rotate; the rotor group 10 rotates relative to the stator group 20, and the motor housing 11 and the rotating center axis 12 rotate; the first bearing 22 and the second bearing 25 both have the movable characteristic that the inner ring and the outer ring can rotate freely, so that the eccentric support 32, the eccentric movable block 31, and the slide rail 33 can rotate asynchronously with the motor housing 11 due to the limit of the limit block 43 to keep the adjusting shaft 41 from rotating; the rotor group 10 can rotate along the rotating center axis 12, while the adjusting shaft 41 cannot rotate.

[0059] The design emphasis of the present invention is:

[0060] First, the eccentric radius can be adjusted by using an eccentric component and an adjusting mechanism, which has a wider applicability.

[0061] Second, the motor housing has an integrally connected rotating center axis, which eliminates the secondary connection between the outer rotor housing and the motor rotating center axis, such as welding and riveting, and replaces it with an integral molding of the motor housing and the rotating center axis, thereby improving the concentricity and verticality of the motor housing and the rotating center axis, reducing the vibration and wear of the motor, reducing the risk of secondary connection, and improving the stability of the motor operation.

[0062] Third, by adopting the eccentric component, the motor has its own eccentric force and eccentric torque, and because the eccentric component is arranged in the same direction of the motor housing, it can ensure that the eccentric component and the motor housing start synchronously when the motor rotates, reducing the torque loss caused by the asynchronous eccentric wheel when the motor starts.

[0063] Fourth, by adopting the limit block, it is ensured that the adjustment shaft will not rotate synchronously or along the rotation center axis; by adopting the limit plate, it is ensured that the adjustment block cannot move axially along the rotation center axis, and the adjustment block can only make radial rotational motion along the rotation center axis, thereby ensuring accuracy.

[0064] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A brushless motor with a variable eccentric radius, characterized in that: It includes a rotor group, a stator group, an eccentric component and an adjusting mechanism. The rotor group is rotatably matched with the stator group; the rotor group has a motor housing, and the motor housing has an integrally connected rotating center axis; the adjusting mechanism has an adjusting shaft, and the adjusting shaft can be axially movable along the rotating center axis and loosely fitted in the rotating center axis; the eccentric component can be rotatably installed on the motor housing along with the motor housing; the adjusting shaft moves along the axial direction of the rotating center axis to drive the eccentric end of the eccentric component to approach or move away from the rotating center axis.

2. The variable eccentric radius brushless motor according to claim 1, characterized in that: The eccentric assembly includes an eccentric movable block and an eccentric support. The eccentric support is rotatably mounted on the upper end of the adjusting shaft. The eccentric movable block is wedge-fitted with the eccentric support. The eccentric movable block can be moved closer to or away from the rotating center axis. The eccentric end of the eccentric assembly is the eccentric movable block. The rotating center axis is a hollow structure, and the adjusting shaft is gap-fitted in the hollow structure of the rotating center axis.

3. The variable eccentric radius brushless motor according to claim 2, characterized in that: The eccentric assembly also includes a slide rail for guiding the eccentric movable block, the slide rail is arranged on the upper side of the motor housing, the eccentric movable block slides with the slide rail, a first slot is penetrated on the eccentric movable block, a second slot is penetrated on the upper side of the motor housing, and the slide rail penetrates the first slot and the second slot; a positioning hole for positioning the slide rail is provided on the upper side of the motor housing; the eccentric movable block has an inclined rod, and the eccentric support has an inclined groove matching the inclined rod.

4. The variable eccentric radius brushless motor according to claim 1, characterized in that: The adjustment mechanism also includes an adjustment block that can rotate forward or reverse. The adjustment block is rotationally matched with the lower end of the adjustment shaft. The adjustment block rotates to drive the adjustment shaft to move axially along the rotation center axis.

5. The variable eccentric radius brushless motor according to claim 4, characterized in that: The adjusting block is rotationally matched with the lower end of the adjusting shaft through a thread or a rotating slot.

6. The variable eccentric radius brushless motor according to claim 4, characterized in that: A limit block for preventing the adjusting shaft from rotating is arranged above the adjusting block, and the limit block is sleeved on the outer side of the adjusting shaft; the limit block abuts against the lower end of the rotating central shaft.

7. The variable eccentric radius brushless motor according to claim 6, characterized in that: The side wall of the adjusting shaft is arranged to be flat, D-shaped or groove-shaped, and the limit block is provided with a special-shaped hole matching the flat, D-shaped or groove-shaped.

8. The variable eccentric radius brushless motor according to claim 6, characterized in that: A limit plate is provided on the lower side of the adjusting block to ensure that the adjusting block cannot move axially along the rotation center axis and can only make radial rotational movement along the rotation center axis. The limit plate is sleeved on the lower side of the adjusting block; a limit step is provided on the adjusting block to abut against the limit plate, and the upper surface of the limit plate abuts against the limit step.

9. The variable eccentric radius brushless motor according to claim 1, characterized in that: The stator group includes a winding stator, a first bearing, a driving PCB board, a stator fixing frame and a second bearing. The winding stator and the driving PCB board are both arranged on the stator fixing frame, the outer ring of the first bearing and the outer ring of the second bearing are both fixed on the stator fixing frame, and the inner ring of the first bearing and the inner ring of the second bearing are both fixed on the rotating center axis of the motor housing; the driving PCB board is provided with indicator lights for displaying GND, NTC, PWM and FG.

10. A method for adjusting the eccentricity of a brushless motor with a variable eccentric radius according to any one of claims 1 to 9, characterized in that: The steps include: First, the adjusting block rotates forward or reversely, and the adjusting shaft moves axially along the rotation center axis by rotating the adjusting block; Second, the axial movement of the adjusting shaft along the rotating center axis drives the eccentric support to move along the axial direction of the rotating center axis; Third, the eccentric support moves and pushes the eccentric movable block to slide on the slide rail, so that the eccentric movable block approaches or moves away from the rotation center axis, thereby changing the eccentric radius or eccentric distance.

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