Variable eccentricity radius brushless motor and method for adjusting eccentricity distance

Abstract

This invention provides a variable eccentricity radius brushless motor and an eccentricity distance adjustment method that enable adjustment of the eccentricity radius, resulting in wider applicability and improved motor operation stability. [Solution] The variable eccentricity radius brushless motor includes a rotor set, a stator set, an eccentricity assembly 30, and an adjustment mechanism. The adjustment mechanism has an adjustment shaft that is clearance-fitted within the rotational center axis so as to be movable along the axial direction of the rotational center axis, and the eccentricity assembly is rotatably mounted on the motor housing 11, and the adjustment shaft moves in the axial direction of the rotational center axis, driving the eccentric end of the eccentricity assembly to move closer to or further away from the rotational center axis, thereby achieving adjustment of the eccentricity radius by employing the eccentricity assembly and the adjustment mechanism.

Description

Technical Field

[0001] The present invention relates to the field of brushless outer rotor motor technology, and particularly refers to a variable eccentric radius brushless motor and an eccentric distance adjustment method.

Background Art

[0002] Commercially available fascia gun motors do not all have an eccentric wheel (crank) structure, and it is necessary to separately assemble an eccentric wheel (crank) component and a radius adjustment moving component. Moreover, most eccentric wheels cannot adjust the eccentric radius, and relatively large space is required for mutual fixation and assembly of the components. Moreover, the cumulative tolerance in the assembly process has a profound impact on the movement stability and noise of the fascia gun. Some products with adjustable eccentric wheel radius of fascia guns all belong to after-installation, that is, after fixing the motor to the housing of the fascia gun, the eccentric wheel and the eccentric radius adjustment part are assembled. When an abnormality appears in the assembly process, it is necessary to disassemble and repair the whole machine, which is disadvantageous for the production of the fascia gun. From the perspective of the end-user's use, a fascia gun that cannot change the eccentric radius can only maintain the same stroke movement. The muscle distribution and the depth of the fascia layer in different parts of the human body are different. For example, the muscle thickness of the thigh and the hand, and the hip are different, so the depth of the fascia layer is also different. Therefore, it is necessary to change the impact stroke for different fascia layers. Commercially available motors do not have an eccentric wheel (crank) or an adjustable eccentric radius structure.

[0003] Most eccentric transmission motors are of the split type. That is, an eccentric wheel is added to a brushless motor to generate eccentric force, and the eccentric wheel is used to connect piston components to form a massage tool or power tool. The drawbacks of this method are: increased cost of the eccentric wheel; increased instability and precision after assembly; and the eccentricity radius is fixed and cannot be varied. Thus, the convenience of assembly and the operability and demand of the user are reduced. Conventional motors used in fascia guns do not employ eccentric components and adjustment mechanisms to achieve adjustment of the eccentricity radius, limiting their range of application. The motor housing is not integrally connected to the rotational axis, making it difficult to guarantee concentricity and perpendicularity between the motor housing and the rotational axis, resulting in low stability of motor operation. Therefore, in response to this situation, there is an urgent need to develop a variable eccentricity radius brushless motor and an eccentricity distance adjustment method to meet the actual demands of users. [Overview of the project] [Problems that the invention aims to solve]

[0004] In view of this, the present invention aims to provide a variable eccentricity radius brushless motor and an eccentricity distance adjustment method to address the shortcomings of the prior art. It achieves adjustment of the eccentricity radius by employing an eccentric assembly and adjustment mechanism, resulting in broader applicability. The motor housing has a rotational center axis that is integrally connected. The process eliminates the need for double connection between the outer rotor housing and the motor rotational center axis, improving the concentricity and perpendicularity between the motor housing and the rotational center axis, reducing the risk of double connection, and improving the stability of motor operation. [Means for solving the problem]

[0005] To achieve the above objective, the present invention employs the following technical solutions.

[0006] A variable eccentricity brushless motor comprising a rotor set, a stator set, an eccentricity assembly, and an adjustment mechanism, wherein the rotor set is rotatably fitted to the stator set, the rotor set has a motor housing with a rotating central axis to which it is integrally connected, the adjustment mechanism has an adjustment shaft that is clearance-fitted within the rotating central axis so as to be movable along the axial direction of the rotating central axis, and the eccentricity assembly is rotatably mounted to the motor housing together with the motor housing, and the adjustment shaft drives the eccentric end of the eccentricity assembly to move closer to or further away from the rotating central axis by moving in the axial direction of the rotating central axis.

[0007] In a preferred embodiment, the eccentric assembly includes an eccentric movable block and an eccentric bracket, the eccentric bracket being rotatably fitted onto the upper end of the adjustment shaft, the eccentric movable block being wedge-shapedly fitted into the eccentric bracket, the eccentric movable block being movable toward or away from the rotational axis, the eccentric end of the eccentric assembly being the eccentric movable block, the rotational axis being a hollow structure, and the adjustment shaft being clearance-fitted within the hollow structure of the rotational axis.

[0008] In a preferred embodiment, the eccentric assembly further includes a slide rail for guiding an eccentric movable block, the slide rail being mounted on the upper side of the motor housing, the eccentric movable block sliding with the slide rail, a first groove being formed through the eccentric movable block, a second groove being formed through the upper side of the motor housing, the slide rail passing through the first groove and the second groove, a positioning hole being formed on the upper side of the motor housing for positioning the slide rail, the eccentric movable block having an oblique rod, and the eccentric bracket having an oblique groove being formed to match the oblique rod.

[0009] In a preferred embodiment, the adjustment mechanism further includes an adjustment block that can rotate forward or backward, the adjustment block being loosely fitted onto the lower end of the adjustment shaft, and the adjustment block rotationally drives the adjustment shaft to move in the axial direction of the rotational axis.

[0010] In a preferred configuration, the adjustment block is loosely fitted to the lower end of the adjustment shaft by a screw or a rotating slide groove.

[0011] In a preferred configuration, a stopper is installed above the adjustment block to prevent the adjustment shaft from rotating, the stopper is fitted to the outside of the adjustment shaft, and the stopper abuts against the lower end of the rotational center axis.

[0012] In a preferred configuration, the side wall of the adjustment shaft is set to a flat position, a D-shape, or a groove shape, and the stopper is provided with a shaped hole that matches the flat position, D-shape, or groove shape.

[0013] In a preferred configuration, a stopper plate is installed on the underside of the adjustment block to ensure that the adjustment block cannot move axially along the rotational axis and can only rotate radially along the rotational axis, the stopper plate is fitted to the underside of the adjustment block, and the adjustment block is provided with a stopper step that contacts the stopper plate, with the upper surface of the stopper plate contacting the stopper step.

[0014] In a preferred embodiment, the stator set includes a wound stator, a first bearing, a drive PCB board, a stator mounting bracket, and a second bearing, wherein both the wound stator and the drive PCB board are mounted on the stator mounting bracket, the outer ring of the first bearing and the outer ring of the second bearing are fixed to the stator mounting bracket, the inner ring of the first bearing and the inner ring of the second bearing are fixed to the rotational axis of the motor housing, and indicator lamps for displaying GND, NTC, PWM, and FG are installed on the drive PCB board.

[0015] The method for adjusting the eccentricity distance of the variable eccentricity radius brushless motor is as follows: Firstly, the adjustment block rotates in the forward or reverse direction, and by rotating the adjustment block, the adjustment shaft is moved (up / down) in the axial direction of the rotation center axis. Secondly, the adjustment shaft moves in the axial direction of the rotational center axis, thereby driving the eccentric bracket to move in the axial direction of the rotational center axis. Thirdly, the method includes the step of changing the eccentric radius or eccentric distance by moving the eccentric bracket to slide the eccentric movable block on the slide rail, thereby moving the eccentric movable block closer to or further away from the rotational axis. [Effects of the Invention]

[0016] The present invention has clear advantages and beneficial effects compared to the prior art, and specifically, as can be seen from the above technical proposal,

[0017] Firstly, by employing an eccentric assembly and adjustment mechanism, the eccentricity radius can be adjusted, resulting in a wider range of applications.

[0018] Secondly, the motor housing has a rotational axis that is integrally connected. The process eliminates secondary connections between the outer rotor housing and the motor rotational axis, such as welding and crimping, and replaces them with integral molding of the motor housing and the rotational axis. This improves the concentricity and perpendicularity between the motor housing and the rotational axis, reduces motor vibration and wear, reduces the risk of secondary connections, and improves the stability of motor operation.

[0019] Thirdly, by employing an eccentric assembly, the motor is given eccentric force and eccentric moment, and since the eccentric assembly is installed in the same direction on the motor housing, it is possible to ensure that the eccentric assembly and the motor housing start up in sync when the motor rotates, thereby reducing the force distance loss caused by the aftermarket eccentric wheel not starting up in sync with the motor.

[0020] Fourthly, by employing a stopper, it is ensured that the adjustment shafts do not synchronize or rotate along the rotational axis, and by employing a stopper plate, it is ensured that the adjustment block cannot move axially along the rotational axis, and can only rotate radially along the rotational axis, thereby ensuring accuracy.

[0021] To more clearly explain the structural features and effects of the present invention, the following will provide a detailed description with reference to the drawings and specific embodiments.

Brief Description of the Drawings

[0022] [Figure 1] It is a three-dimensional structural schematic diagram of the variable eccentric radius brushless motor of the present invention from a first viewing angle. [Figure 2] It is a three-dimensional structural schematic diagram of the variable eccentric radius brushless motor of the present invention from a second viewing angle. [Figure 3] It is an exploded view of the variable eccentric radius brushless motor of the present invention. [Figure 4] It is a cross-sectional view of the variable eccentric radius brushless motor of the present invention. [Figure 5] It is a three-dimensional structural schematic diagram of the eccentric assembly of the present invention. [Figure 6] It is a three-dimensional structural schematic diagram of the eccentric assembly and the adjustment shaft of the present invention. [Figure 7] It is a three-dimensional structural schematic diagram of the eccentric assembly and the adjustment mechanism of the present invention. [Figure 8] It is an exploded view of the eccentric assembly and the motor housing of the present invention. [Figure 9] It is an exploded view of the eccentric bracket and the adjustment shaft of the present invention. [Figure 10] It is an exploded view of the rotor set and the stator set of the present invention. [Figure 11] It is a three-dimensional structural schematic diagram of the motor housing of the present invention. [Figure 12] It is a three-dimensional structural schematic diagram of the adjustment block, stopper and stopper plate of the present invention. [Figure 13] It is a three-dimensional structural schematic diagram of the stopper of the present invention.

Modes for Carrying Out the Invention

[0023] As shown in Figures 1 to 13 of the present invention, the present invention relates to a variable eccentricity radius brushless motor and an eccentricity distance adjustment method, wherein the variable eccentricity radius brushless motor includes a rotor set 10, a stator set 20, an eccentricity assembly 30, and an adjustment mechanism 40, where, The rotor set 10 is rotatably fitted to the stator set 20, and the rotor set 10 has a motor housing 11 with a rotating central shaft 12 to which it is integrally connected, and the adjustment mechanism 40 has an adjustment shaft 41 that is clearance-fitted into the rotating central shaft 12 so as to be movable along the axial direction of the rotating central shaft, and the eccentric assembly 30 is rotatably mounted to the motor housing 11 together with the motor housing 11, and the adjustment shaft 41 moves in the axial direction of the rotating central shaft to drive the eccentric end of the eccentric assembly 30 closer to or further away from the rotating central shaft 12.

[0024] The eccentric assembly 30 includes an eccentric movable block 31 and an eccentric bracket 32, the eccentric bracket 32 ​​being rotatably fitted onto the upper end of the adjustment shaft 41, the eccentric movable block 31 being wedge-shaped fitted into the eccentric bracket 32, the eccentric movable block 31 being movable toward or away from the rotational axis 12, the eccentric end of the eccentric assembly 30 being the eccentric movable block 31, the rotational axis 12 being a hollow structure 112, and the adjustment shaft 41 being clearance-fitted within the hollow structure 112 of the rotational axis 12.

[0025] A bearing 411 is installed between the eccentric bracket 32 ​​and the adjustment shaft 41. The eccentric bracket 32 ​​is rotatably fitted onto the upper end of the adjustment shaft 41 by the bearing 411. The bearing 411 is press-fitted into the eccentric bracket 32 ​​and mounted at the stepped position at the tip of the adjustment shaft 41. It is then fixed in place by screw locking within the hole at the tip of the adjustment shaft 41.

[0026] The eccentric movable block 31 is rotatable in conjunction with the rotation of the motor housing 11. When the center of the eccentric movable block 31 moves away from the rotation axis 12, the eccentric rotation radius increases, and when the center of the eccentric movable block 31 is close to the rotation axis 12, the eccentric rotation radius decreases.

[0027] The eccentric assembly 30 further includes a slide rail 33 for guiding an eccentric movable block 31, the slide rail 33 being mounted on the upper side of the motor housing 11, the eccentric movable block 31 sliding with the slide rail 33, a first groove 312 being formed through the eccentric movable block 31, a second groove 111 being formed through the upper side of the motor housing 11, the slide rail 33 passing through the first groove 312 and the second groove 111, a positioning hole 113 being formed on the upper side of the motor housing 11 for positioning the slide rail 33, the eccentric movable block 31 having an oblique rod 311, and the eccentric bracket 32 ​​having an oblique groove 321 matching the oblique rod 311.

[0028] Explanation of the movement relationship between the adjustment shaft 41 and the eccentric movable block 31: The movement directions of the adjustment shaft 41 are A and B, and the movement directions of the eccentric movable block 31 are A1 and B1. When the adjustment shaft 41 moves in direction A, the eccentric movable block 31 moves along the slide rail 33 so as to approach the rotational axis 12, i.e., the eccentric movable block 31 moves in direction A1. When the adjustment shaft 41 moves in direction B, the eccentric movable block 31 moves along the slide rail 33 so as to move away from the rotational axis 12, i.e., the eccentric movable block 31 moves in direction B1.

[0029] The adjustment mechanism 40 further includes an adjustment block 42 that can rotate forward or backward, the adjustment block 42 being loosely fitted to the lower end of the adjustment shaft 41, the adjustment block 42 rotationally driving the adjustment shaft 41 to move in the axial direction of the rotational center axis, the adjustment block 42 being loosely fitted to the lower end of the adjustment shaft 41 by a screw or a rotating slide groove, the rotating slide groove may be a screw-shaped rotating slide groove that ensures the rotation of the adjustment block.

[0030] A stopper 43 is installed above the adjustment block 42 to prevent the adjustment shaft 41 from rotating, and the stopper 43 is fitted to the outside of the adjustment shaft 41. The stopper 43 abuts against the lower end of the rotational axis 12. The stopper 43 ensures that the adjustment shaft 41 does not synchronize or rotate along the rotational axis 12. The side wall of the adjustment shaft 41 is set to a flat position, D-shape, or groove shape, and the stopper 43 has a shaped hole 431 that matches the flat position, D-shape, or groove shape. A stopper plate 44 is installed below the adjustment block 42 to ensure that the adjustment block 42 cannot move axially along the rotational axis 12, and that the adjustment block 42 can only rotate radially along the rotational axis 12, and the stopper plate 44 is fitted to the underside of the adjustment block 42. The adjustment block 42 is equipped with a stopper step 421 for contacting the stopper plate 44, and the upper surface of the stopper plate 44 contacts the stopper step 421. By reversing the adjustment block 42, the adjustment shaft 41 is moved in direction A or B along the axial direction of the rotational center axis by the action of a screw (or rotating slide groove).

[0031] The stator set 20 includes a wound stator 21, a first bearing 22, a drive PCB board 23, a stator mounting bracket 24, and a second bearing 25. Both the wound stator 21 and the drive PCB board 23 are mounted on the stator mounting bracket 24, the outer ring of the first bearing 22 and the outer ring of the second bearing 25 are fixed to the stator mounting bracket 24, the inner ring of the first bearing 22 and the inner ring of the second bearing 25 are fixed to the rotational axis 12 of the motor housing 11, and indicator lamps 231 for displaying GND, NTC, PWM, and FG are installed on the drive PCB board 23. When the motor housing 11 rotates, both the inner ring of the first bearing 22 and the inner ring of the second bearing 25 rotate together.

[0032] This patent integrates a motor, eccentric wheel, and adjustable eccentricity radius moving and transmission components into a single unit, effectively saving internal space dimensions in the fascia gun and improving assembly accuracy and motion stability during assembly. The motor in this patent can be used in the fascia gun and considered as a motor module, and is assembled directly into the fascia gun housing, reducing assembly and maintenance costs compared to add-on eccentric wheels and eccentricity radius adjustment structures. For a wide range of fascia gun manufacturers, this patent provides a motor that can adjust the striking (piston motion stroke) of the fascia gun, eliminating the need to separately design and assemble adjustable transmission components, and solving a series of problems associated with add-on designs, such as space dimensions, assembly and maintenance, and increased costs.

[0033] Compared to conventional motors, the motor rotation shaft is eliminated (because the rotational center shaft 12 and the motor housing 11 are integrated), allowing the space at the center of the motor to be effectively used for adjusting the eccentric assembly 30. The adjustment shaft 41 cannot rotate (radially or circumferentially) and can only move in the axial direction of the rotational center shaft. It forms a one-movement, one-static structure with the motor rotor set 10, and they do not affect or interfere with each other. (The adjustment method for the adjustment shaft 41 in the center of the motor may be manual or electric).

[0034] This invention has the advantage that the motor housing 11 has an eccentric weight, eliminating the need for an aftermarket eccentric wheel, allowing for an adjustable eccentricity radius, broader applicability, the ability for the user to adjust the piston's movement length according to different massage needs during operation, the ability to change the massage impact depth, and the ability to adjust its eccentricity radius according to different thickness and depth needs during drilling to improve impact efficiency, making it suitable for fascia guns and hammers.

[0035] The method for adjusting the eccentricity distance of the variable eccentricity radius brushless motor is as follows: Firstly, the adjustment block rotates in the forward or reverse direction, and by rotating the adjustment block, the adjustment shaft is moved (up / down) in the axial direction of the rotation center axis. Secondly, the adjustment shaft moves in the axial direction of the rotational center axis, thereby driving the eccentric bracket to move in the axial direction of the rotational center axis. Thirdly, the method includes the step of changing the eccentric radius or eccentric distance by moving the eccentric bracket to slide the eccentric movable block on the slide rail, thereby moving the eccentric movable block closer to or further away from the rotational axis.

[0036] The method of use and principle of the variable eccentricity radius brushless motor are as follows.

[0037] The drive PCB board 23 turns on the power supply (VCC and GND) to the external power supply. The wound stator 21 forms multiple pairs of electrode windings (by winding enameled wire or insulated copper wire around a group of silicon steel sheets). An annular permanent magnet or group of magnets is fixed inside the motor housing 11. The motor housing 11 and the stator fixing bracket 24 are assembled by connecting them via the first bearing 22 and the second bearing 25. When connected to the external power supply, the drive PCB board 23 alternately energizes the electrode windings in the wound stator 21, generating opposite-direction magnetic attraction with the magnet or magnetic ring on the rotor set 10, and the rotor set 10 is driven to rotate during the alternating energization attraction process. The rotor set 10 rotates relative to the stator set 20, and the motor housing 11 and the rotation center axis 12 rotate. Both the first bearing 22 and the second bearing 25 have movable characteristics that allow the inner and outer rings to rotate freely, enabling asynchronous rotation of the adjustment shaft 41 to hold the stopper 43 in place when the eccentric bracket 32, eccentric movable block 31, and slide rail 33 rotate together with the motor housing 11. The rotor set 10 rotates along the rotation center axis 12, while the adjustment shaft 41 does not rotate.

[0038] The design focus of this invention is as follows:

[0039] Firstly, by employing an eccentric assembly and adjustment mechanism, the eccentricity radius can be adjusted, resulting in a wider range of applications.

[0040] Secondly, the motor housing has a rotational axis that is integrally connected. The process eliminates secondary connections between the outer rotor housing and the motor rotational axis, such as welding and crimping, and replaces them with integral molding of the motor housing and the rotational axis. This improves the concentricity and perpendicularity between the motor housing and the rotational axis, reduces motor vibration and wear, reduces the risk of secondary connections, and improves the stability of motor operation.

[0041] Thirdly, by employing an eccentric assembly, the motor is given eccentric force and eccentric moment, and since the eccentric assembly is installed in the same direction on the motor housing, it is possible to ensure that the eccentric assembly and the motor housing start up in sync when the motor rotates, thereby reducing the force distance loss caused by the aftermarket eccentric wheel not starting up in sync with the motor.

[0042] Fourthly, by employing a stopper, it is ensured that the adjustment shafts do not synchronize or rotate along the rotational axis, and by employing a stopper plate, it is ensured that the adjustment block cannot move axially along the rotational axis, and can only rotate radially along the rotational axis, thereby ensuring accuracy.

[0043] The above descriptions are merely preferred embodiments of the present invention and do not impose any limitations on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and modifications made to the above embodiments based on the gist of the present invention all fall within the scope of the technical proposal of the present invention. [Explanation of symbols]

[0044] 10. Rotor set, 11. Motor housing, 111. Second groove, 112. Hollow structure, 113. Positioning hole, 12. Rotation center shaft, 20. Stator set, 21. Winding stator, 22. First bearing, 23. Drive PCB board, 231. Indicator lamp, 24. Stator mounting bracket, 25. Second bearing, 30. Eccentric assembly, 31. Eccentric movable block, 311. Diagonal rod, 312. First groove, 32. Eccentric bracket, 321. Diagonal groove, 33. Slide rail, 40. Adjustment mechanism, 41. Adjustment shaft, 411. Bearing, 42. Adjustment block, 421. Stopper step, 43. Stopper, 431. Irregularly shaped hole, 44. Stopper plate

Claims

1. A variable eccentricity brushless motor comprising a rotor set, a stator set, an eccentricity assembly, and an adjustment mechanism, wherein the rotor set is rotatably fitted to the stator set, the rotor set has a motor housing having a rotating central axis to which it is integrally connected, the adjustment mechanism has an adjustment shaft that is clearance-fitted within the rotating central axis so as to be movable along the axial direction of the rotating central axis, and the eccentricity assembly is rotatably mounted to the motor housing together with the motor housing, and the adjustment shaft drives the eccentric end of the eccentricity assembly to move closer to or further away from the rotating central axis by moving in the axial direction of the rotating central axis.

2. The variable eccentricity brushless motor according to claim 1, wherein the eccentric assembly includes an eccentric movable block and an eccentric bracket, the eccentric bracket being rotatably fitted onto the upper end of the adjustment shaft, the eccentric movable block being wedge-shaped fitted into the eccentric bracket, the eccentric movable block being movable toward or away from the rotational axis, the eccentric end of the eccentric assembly being the eccentric movable block, the rotational axis being a hollow structure, and the adjustment shaft being clearance-fitted within the hollow structure of the rotational axis.

3. The variable eccentricity brushless motor according to claim 2, further comprising a slide rail for guiding an eccentric movable block, the slide rail being mounted on the upper side of the motor housing, the eccentric movable block sliding with the slide rail, a first groove being formed through the eccentric movable block, a second groove being formed through the upper side of the motor housing, the slide rail passing through the first groove and the second groove, a positioning hole being formed on the upper side of the motor housing for positioning the slide rail, the eccentric movable block having an oblique rod, and an oblique groove being formed in the eccentric bracket to match the oblique rod.

4. The variable eccentricity brushless motor according to claim 1, further comprising an adjustment block that can rotate forward or backward, the adjustment block being loosely fitted to the lower end of the adjustment shaft, and the adjustment block rotationally driving the adjustment shaft to move in the axial direction of the rotation center axis.

5. The variable eccentricity radius brushless motor according to claim 4, characterized in that the adjustment block is loosely fitted to the lower end of the adjustment shaft by a screw or a rotating slide groove.

6. The variable eccentricity brushless motor according to claim 4, characterized in that a stopper for preventing rotation of the adjustment shaft is installed above the adjustment block, the stopper is fitted to the outside of the adjustment shaft, and the stopper abuts against the lower end of the rotation center axis.

7. The variable eccentricity brushless motor according to claim 6, characterized in that the side wall of the adjustment shaft is set to a flat position, a D shape, or a groove shape, and the stopper has a non-standard shaped hole that matches the flat position, D shape, or groove shape.

8. A stopper plate is installed on the lower side of the adjustment block to ensure that the adjustment block cannot move axially along the rotational axis and can only rotate radially along the rotational axis, the stopper plate is fitted to the lower side of the adjustment block, and a stopper step is installed on the adjustment block to contact the stopper plate, the upper surface of the stopper plate contacts the stopper step, the variable eccentricity radius brushless motor according to claim 6.

9. The stator set comprises a wound stator, a first bearing, a drive PCB board, a stator mounting bracket, and a second bearing, wherein both the wound stator and the drive PCB board are mounted on the stator mounting bracket, the outer ring of the first bearing and the outer ring of the second bearing are fixed to the stator mounting bracket, the inner ring of the first bearing and the inner ring of the second bearing are fixed to the rotational axis of the motor housing, and indicator lamps for displaying GND, NTC, PWM, and FG are installed on the drive PCB board, characterized in that the variable eccentricity radius brushless motor is as described in claim 1.

10. A method for adjusting the eccentricity distance of a variable eccentricity radius brushless motor according to any one of claims 1 to 9, Firstly, the adjustment block rotates in the forward or reverse direction, and the adjustment shaft is moved in the axial direction of the rotation center axis by rotating the adjustment block. Secondly, the adjustment shaft moves in the axial direction of the rotational center axis, thereby driving the eccentric bracket to move in the axial direction of the rotational center axis. Thirdly, an eccentricity distance adjustment method characterized by including the step of moving an eccentric bracket to slide an eccentric movable block on a slide rail, thereby changing the eccentricity radius or eccentricity distance by moving the eccentric movable block closer to or further away from the rotational axis.

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