Brushless motor with variable eccentric radius
By introducing eccentric components and adjustment mechanisms into the fascia gun motor, the eccentric radius can be adjusted, which solves the problem of limited application range and poor stability of the fascia gun motor, improves the stability and assembly accuracy of the motor, and reduces costs.
Patent Information
- Application Number
- CN202422301776.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-20
AI Technical Summary
The existing fascia gun motor lacks an adjustable eccentric radius structure, resulting in limited application scope, inconvenient assembly and poor stability, which cannot meet the massage needs of different muscle layers.
The eccentric assembly and adjustment mechanism are adopted to drive the eccentric end of the eccentric assembly close to or away from the rotation center axis by adjusting the shaft to achieve adjustable eccentric radius. The motor housing is integrated with the rotation center axis, canceling the secondary connection, and improving concentricity and perpendicularity.
It expands the suitability of the motor, improves the stability and accuracy of motor operation, reduces assembly and maintenance costs, ensures that the eccentric assembly starts simultaneously with the motor housing, and reduces vibration and wear.
Smart Images
Figure CN223124721U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technology of brushless outer-rotor motors, in particular to a brushless motor with variable eccentric radius. Background Art
[0002] The motors of percussion massagers on the market do not come with an eccentric wheel (crank) structure, and an eccentric wheel (crank) part and a component for adjusting the radius of movement need to be assembled additionally; moreover, most of the eccentric wheels cannot adjust the eccentric radius, and the mutual fixation and assembly of parts require a large space, and the cumulative tolerance in the assembly process seriously affects the movement stability and noise of the percussion massager; for some percussion massagers with adjustable eccentric wheel radius, they are all after-installed, that is, the motor is fixed to the percussion massager housing and then the eccentric wheel and the eccentric radius adjusting part are assembled. When an abnormality occurs during the assembly process, the whole machine needs to be disassembled for repair, which is not conducive to the production of percussion massagers; from the perspective of end-user use, a percussion massager with an unchangeable eccentric radius can only maintain the same stroke movement, while the muscle distribution and the depth of the fascia layer in different parts of the human body are different, such as the thighs and hands, and the thickness of the gluteal muscles is different, so the depth of the fascia layer is also different; therefore, when targeting fascia layers of different depths, the striking stroke needs to be changed; however, the motors on the market do not have an eccentric wheel (crank) and a structure with adjustable eccentric radius.
[0003] Most of the transmission eccentric motors are split-type: that is, an eccentric wheel is added to a brushless motor to generate an eccentric force, and the eccentric wheel is used to connect the piston component to form a massage tool or a power tool; the disadvantages of this method are: it increases the cost of the eccentric wheel; it increases the instability and consistency after assembly; the eccentric radius is fixed and cannot be changed; thus, it reduces the assembly convenience, the user's controllability and requirements; in the prior art, the motors used for percussion massagers do not adopt an eccentric component and an adjusting mechanism to realize the adjustment of the eccentric radius, and the scope of application is limited; the motor housing is not integrally connected to the rotation center shaft, which is not conducive to ensuring the concentricity and perpendicularity of the motor housing and the rotation center shaft, 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 variable eccentric radius to meet the actual use requirements. Summary of the Utility Model
[0004] In view of this, in view of the deficiencies of the prior art, the main purpose of the present utility model is to provide a brushless motor with variable eccentric radius, which realizes the adjustment of the eccentric radius by adopting an eccentric component and an adjusting mechanism, and has a wider applicability; the motor housing has a rotation center shaft with an integral connection, and the secondary connection between the outer-rotor housing and the motor rotation center shaft is eliminated in the process, which improves the concentricity and perpendicularity of the motor housing and the rotation center shaft, reduces the risk of secondary connection, and improves the stability of the motor operation.
[0005] To achieve the above purpose, the present utility model adopts the following technical solutions:
[0006] A variable eccentric radius brushless motor includes a rotor group, a stator group, an eccentric component, and an adjustment mechanism. The rotor group is rotatably and cooperatively engaged with the stator group. The rotor group has a motor housing, and the motor housing has a rotation center shaft integrally connected. The adjustment mechanism has an adjustment shaft, and the adjustment shaft is movably and clearance-fitted axially along the rotation center shaft within the rotation center shaft. The eccentric component is rotatably mounted on the motor housing along with the motor housing. The adjustment shaft drives the eccentric end of the eccentric component to approach or move away from the rotation center shaft axially along the rotation center shaft.
[0007] As a preferred solution: The eccentric component includes an eccentric movable block and an eccentric support. The eccentric support is rotatably sleeved on the upper end of the adjustment shaft. The eccentric movable block is wedge-fitted with the eccentric support, and the eccentric movable block can move closer to or away from the rotation center shaft. The eccentric end of the eccentric component is the eccentric movable block. The rotation center shaft is a hollow structure, and the adjustment shaft is clearance-fitted within the hollow structure of the rotation center shaft.
[0008] As a preferred solution: The eccentric component further 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 is slidably engaged with the slide rail. A first slot is formed through the eccentric movable block, and a second slot is formed through the upper side of the motor housing. The slide rail passes through the first slot and the second slot. A positioning hole for positioning the slide rail is formed on the upper side of the motor housing. The eccentric movable block has an inclined rod, and an inclined slot matching the inclined rod is formed in the eccentric support.
[0009] As a preferred solution: The adjustment mechanism further includes an adjustment block that can rotate forward or backward. The adjustment block is rotatably engaged 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 shaft.
[0010] As a preferred solution: The adjustment block and the lower end of the adjustment shaft are rotatably engaged through a thread or a rotating chute.
[0011] As a preferred solution: A limiting block for preventing the adjustment shaft from rotating is arranged above the adjustment block. The limiting block is sleeved on the outside of the adjustment shaft. The limiting block abuts against the lower end of the rotation center shaft.
[0012] As a preferred solution: The side wall of the adjustment shaft is set to be flat, D-shaped, or grooved, and a special-shaped hole matching the flat, D-shaped, or grooved shape is formed in the limiting block.
[0013] As a preferred solution: A limiting plate for ensuring that the adjustment block cannot move axially along the rotation center shaft and can only rotate radially along the rotation center shaft is arranged on the lower side of the adjustment block. The limiting plate is sleeved on the lower side of the adjustment block. A limiting step for abutting against the limiting plate is arranged on the adjustment block, and the upper surface of the limiting plate abuts against the limiting step.
[0014] As a preferred solution: The stator group includes a wound stator, a first bearing, a driving PCB board, a stator fixing bracket, and a second bearing. The wound stator and the driving PCB board are both arranged on the stator fixing bracket. The outer rings of the first bearing and the second bearing are both fixed on the stator fixing bracket, and the inner rings of the first bearing and the second bearing are both fixed on the rotation center axis of the motor housing. An indicator lamp for displaying GND, NTC, PWM, and FG is arranged on the driving PCB board.
[0015] The eccentric distance adjustment method of the variable eccentric radius brushless motor includes the following steps:
[0016] First, the adjustment block rotates forward or backward. By rotating the adjustment block, the adjustment shaft moves axially (up / down) along the rotation center axis.
[0017] Second, the axial movement of the adjustment shaft along the rotation center axis drives the eccentric support to move axially along the rotation center axis together.
[0018] Third, the movement of the eccentric support further 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 the eccentric distance.
[0019] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solutions,
[0020] First, the adjustment of the eccentric radius is realized by adopting an eccentric component and an adjustment mechanism, and the applicability is wider.
[0021] Second, the motor housing has an integrally connected rotation center axis. In terms of technology, the secondary connection between the outer rotor housing and the motor rotation center axis, such as welding and riveting, is cancelled, and the motor housing and the rotation center axis are integrally formed, improving the concentricity and perpendicularity between the motor housing and the rotation 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 an eccentric component, the motor has a self - contained eccentric force and eccentric moment, and since 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 start of the post - installed eccentric wheel.
[0023] Fourth, by adopting a limit block, it is ensured that the adjustment shaft does not rotate synchronously or along the rotation center axis; by adopting a limit plate, it is ensured that the adjustment block cannot move axially along the rotation center axis, and the adjustment block can only rotate radially along the rotation center axis, ensuring the accuracy.
[0024] To more clearly illustrate the structural features and functions of the present utility model, the following will provide a detailed description thereof in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings
[0025] Figure 1 Schematic diagram of the three-dimensional structure of the variable eccentric radius brushless motor of the present utility model from the first perspective;
[0026] Figure 2 Schematic diagram of the three-dimensional structure of the variable eccentric radius brushless motor of the present utility model from the second perspective;
[0027] Figure 3 Exploded view of the variable eccentric radius brushless motor of the present utility model;
[0028] Figure 4 Cross-sectional view of the variable eccentric radius brushless motor of the present utility model;
[0029] Figure 5 Schematic diagram of the three-dimensional structure of the eccentric component of the present utility model;
[0030] Figure 6 Schematic diagram of the three-dimensional structure of the eccentric component and the adjustment shaft of the present utility model;
[0031] Figure 7 Schematic diagram of the three-dimensional structure of the eccentric component and the adjustment mechanism of the present utility model;
[0032] Figure 8 Exploded view of the eccentric component and the motor housing of the present utility model;
[0033] Figure 9 Exploded view of the eccentric support and the adjustment shaft of the present utility model;
[0034] Figure 10 Exploded view of the rotor group and the stator group of the present utility model;
[0035] Figure 11 Schematic diagram of the three-dimensional structure of the motor housing of the present utility model;
[0036] Figure 12 Schematic diagram of the three-dimensional structure of the adjustment block, the limit block and the limit plate of the present utility model;
[0037] Figure 13 Schematic diagram of the three-dimensional structure of the limit block of the present utility model.
[0038] Description of the reference numerals in the drawings:
[0039] In the figure: 10, rotor group; 11, motor housing; 111, second slot; 112, hollow structure; 113, positioning hole; 12, rotating central axis; 20, stator group; 21, wound stator; 22, first bearing; 23, driving PCB board; 231, indicator light; 24, stator fixing bracket; 25, second bearing; 30, eccentric component; 31, eccentric movable block; 311, inclined rod; 312, first slot; 32, eccentric support; 321, inclined slot; 33, slide rail; 40, adjusting mechanism; 41, adjusting shaft; 411, bearing; 42, adjusting block; 421, limiting step; 43, limiting block; 431, special-shaped hole; 44, limiting plate. Detailed implementation manner
[0040] As shown in the present utility model Figures 1 to 13 A variable eccentricity radius brushless motor includes a rotor group 10, a stator group 20, an eccentric component 30, and an adjusting mechanism 40, wherein:
[0041] The rotor group 10 is rotatably and cooperatively engaged with the stator group 20; the rotor group 10 has a motor housing 11, and the motor housing 11 has an integrally connected rotating central axis 12; the adjusting mechanism 40 has an adjusting shaft 41, and the adjusting shaft 41 is axially movably and clearance-fitted within the rotating central axis 12 along the axial direction of the rotating central axis; the eccentric component 30 is rotatably mounted on the motor housing 11 along with the motor housing 11; the axial movement of the adjusting shaft 41 along the rotating central axis drives the eccentric end of the eccentric component 30 to approach or move away from the rotating central axis 12.
[0042] The eccentric component 30 includes an eccentric movable block 31 and an eccentric support 32. The eccentric support 32 is rotatably sleeved 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 can move closer to or away from the rotating central axis 12. The eccentric end of the eccentric component 30 is the eccentric movable block 31; the rotating central axis 12 is a hollow structure 112, and the adjusting shaft 41 is clearance-fitted within the hollow structure 112 of the rotating central axis 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 at the stepped position at the front end of the adjusting shaft 41, and fixed by screwing into the hole at the front end of the adjusting shaft 41.
[0044] The eccentric movable block 31 can rotate along with the rotation of the motor housing 11. When the center of the eccentric movable block 31 moves away from the rotating central axis 12, the eccentric rotation radius becomes larger; the eccentric movable block 31 can rotate along with the rotation of the motor housing 11. When the center of the eccentric movable block 31 moves closer to the rotating central axis 12, the eccentric rotation radius becomes smaller.
[0045] The eccentric assembly 30 further includes a slide rail 33 for guiding the eccentric movable block 31. The slide rail 33 is disposed on the upper side of the motor housing 11, and the eccentric movable block 31 is slidably engaged with the slide rail 33. A first slot 312 is formed through the eccentric movable block 31, a second slot 111 is formed through the upper side of the motor housing 11, and the slide rail 33 passes through the first slot 312 and the second slot 111. A positioning hole 113 for positioning the slide rail 33 is formed on the upper side of the motor housing 11. The eccentric movable block 31 has an inclined rod 311, and the eccentric support 32 is provided with an inclined slot 321 matching the inclined rod 311.
[0046] Description of the motion relationship between the adjusting shaft 41 and the eccentric movable block 31: The motion directions of the adjusting shaft 41 are A and B; the motion 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 close to the rotation center axis 12, that is, the eccentric movable block 31 moves in the A1 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 B1 direction.
[0047] The adjusting mechanism 40 further includes an adjusting block 42 that can rotate forward or backward. The adjusting block 42 is rotatably engaged with the lower end of the adjusting shaft 41, and the adjusting block 42 rotates to drive the adjusting shaft 41 to move axially along the rotation center axis. The adjusting block 42 and the lower end of the adjusting shaft 41 are rotatably engaged through a thread or a rotating chute. The rotating chute can be a thread-shaped rotating chute for ensuring the rotation of the adjusting block.
[0048] Above the adjusting block 42, a limiting block 43 for preventing the adjusting shaft 41 from rotating is provided. The limiting block 43 is sleeved outside the adjusting shaft 41. The limiting block 43 abuts against the lower end of the rotation center axis 12. The adjusting shaft 41 is prevented from rotating synchronously or along the rotation center axis 12 through the limiting block 43. The side wall of the adjusting shaft 41 is set as a flat position, a D shape or a groove shape, and the limiting block 43 is provided with a special-shaped hole 431 matching the flat position, the D shape or the groove shape. Below the adjusting block 42, a limiting plate 44 for ensuring that the adjusting block 42 cannot move axially along the rotation center axis 12 and the adjusting block 42 can only rotate radially along the rotation center axis 12 is provided. The limiting plate 44 is sleeved below the adjusting block 42. The adjusting block 42 is provided with a limiting step 421 for abutting against the limiting plate 44, and the upper surface of the limiting plate 44 abuts against the limiting step 421. By rotating the adjusting block 42 forward / backward, under the action of the thread (or the rotating chute), the adjusting shaft 41 moves axially in the A direction or the B direction along the rotation 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 rotation center axis drives the eccentric support to move axially along the rotation center axis together;
[0056] Third, the movement of the eccentric support further 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 the eccentricity.
[0057] The usage method and principle of this variable eccentric radius brushless motor are as follows:
[0058] Drive the PCB board 23 to connect to an external power supply (VCC and GND) to get powered on; the wound stator 21 (wind enameled wire or insulated copper wire on the silicon steel sheet group) forms multiple pairs of electrode windings; a ring-shaped permanent magnet or magnet group is fixed inside the motor housing 11; connect and assemble the motor housing 11 and the stator fixing frame 24 through the first bearing 22 and the second bearing 25; when an external power supply is connected, alternately power on the electrode windings in the wound stator 21 through the drive PCB board 23 to make them attract with the magnets or magnetic rings on the rotor group 10 due to opposite magnetic directions, and traction and drive the rotor group 10 to rotate during the alternate power-on adsorption process; the rotor group 10 rotates relative to the stator group 20, and the motor housing 11 and the rotation center axis 12 rotate; both the first bearing 22 and the second bearing 25 have the movable characteristics that the inner ring and the outer ring can rotate freely, so that when the eccentric support 32, the eccentric movable block 31, and the slide rail 33 rotate with the motor housing 11, the adjusting shaft 41 does not rotate synchronously due to the limitation of the limiting block 43; the rotor group 10 rotates along the rotation center axis 12, while the adjusting shaft 41 cannot rotate.
[0059] The design focus of the present utility model lies in:
[0060] First, the adjustment of the eccentric radius is realized by adopting an eccentric component and an adjustment mechanism, and the applicability is wider.
[0061] Second, the motor housing has a rotation center axis with an integral connection. In terms of technology, the secondary connection of the outer rotor housing and the motor rotation center axis, such as welding and riveting, is cancelled, and the motor housing and the rotation center axis are integrally formed, which improves the concentricity and perpendicularity of the motor housing and the rotation center axis, reduces the vibration and wear of the motor, reduces the risk of secondary connection, and improves the stability of the motor operation.
[0062] Third, by adopting an eccentric component, the motor has its own eccentric force and eccentric moment, and since 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 asynchrony of the retrofitted eccentric wheel during the motor startup.
[0063] Fourthly, by adopting a limit block, it is ensured that the adjustment shaft will not rotate synchronously or along the rotation center axis; by adopting a limit plate, it is ensured that the adjustment block cannot move axially along the rotation center axis, and the adjustment block can only rotate radially along the rotation center axis, ensuring the accuracy.
[0064] The above are only the preferred embodiments of the present invention, and do not impose any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. A variable eccentric radius brushless motor, characterized in that: It includes a rotor group, a stator group, an eccentric component and an adjusting mechanism. The rotor group is rotatably and cooperatively matched with the stator group. The rotor group has a motor housing, and the motor housing has a rotation center shaft integrally connected. The adjusting mechanism has an adjusting shaft, and the adjusting shaft is movably and clearance-fitted in the rotation center shaft along the axial direction of the rotation center shaft. The eccentric component is rotatably mounted on the motor housing along with the motor housing. The axial movement of the adjusting shaft along the rotation center shaft drives the eccentric end of the eccentric component to approach or move away from the rotation center shaft.
2. The brushless motor with variable eccentric radius according to claim 1, wherein: The eccentric component includes an eccentric movable block and an eccentric support. The eccentric support is rotatably sleeved 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 move closer to or away from the rotation center shaft. The eccentric end of the eccentric component is the eccentric movable block. The rotation center shaft is a hollow structure, and the adjusting shaft is clearance-fitted in the hollow structure of the rotation center shaft.
3. The brushless motor with variable eccentric radius according to claim 2, characterized in that: The eccentric component further 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 is slidably matched with the slide rail. A first slot is penetratedly opened on the eccentric movable block, a second slot is penetratedly opened on the upper side of the motor housing, and the slide rail penetrates through the first slot and the second slot. A positioning hole for positioning the slide rail is opened on the upper side of the motor housing. The eccentric movable block has an inclined rod, and an inclined groove matching the inclined rod is opened on the eccentric support.
4. The brushless motor with variable eccentric radius according to claim 1, characterized in that: The adjusting mechanism further includes an adjusting block that can rotate forward or backward. The adjusting block is rotationally matched with the lower end of the adjusting shaft, and the rotation of the adjusting block drives the adjusting shaft to move axially along the rotation center shaft.
5. The brushless motor with variable eccentric radius according to claim 4, characterized in that: The adjusting block and the lower end of the adjusting shaft are rotationally matched through threads or a rotating chute.
6. The brushless motor with variable eccentric radius according to claim 4, wherein: A limiting block for preventing the adjusting shaft from rotating is arranged above the adjusting block. The limiting block is sleeved on the outer side of the adjusting shaft. The limiting block abuts against the lower end of the rotation center shaft.
7. The brushless motor with variable eccentric radius according to claim 6, characterized in that: The side wall of the adjusting shaft is set to be flat, D-shaped or grooved, and a special-shaped hole matching the flat, D-shaped or grooved shape is opened on the limiting block.
8. The brushless motor with variable eccentric radius according to claim 6, characterized in that: A limiting plate for ensuring that the adjusting block cannot move axially along the rotation center shaft and the adjusting block can only rotate radially along the rotation center shaft is arranged on the lower side of the adjusting block. The limiting plate is sleeved on the lower side of the adjusting block. A limiting step for abutting against the limiting plate is arranged on the adjusting block, and the upper surface of the limiting plate abuts against the limiting step.
9. The variable eccentric radius brushless motor according to claim 1, wherein: The stator group includes a wound stator, a first bearing, a driving PCB board, a stator fixing frame and a second bearing. The wound stator and the driving PCB board are both arranged on the stator fixing frame. The outer rings of the first bearing and the second bearing are both fixed on the stator fixing frame, and the inner rings of the first bearing and the second bearing are both fixed on the rotation center shaft of the motor housing. Indicating lamps for displaying GND, NTC, PWM and FG are arranged on the driving PCB board.