Reciprocating rotating brushless motor device

Abstract

A brushless motor device capable of rotating in a reciprocating mode comprises a shell, an output shaft, a rotor assembly and a stator assembly, and is characterized in that a limiting piece and a first magnet are arranged on the output shaft, a limiting groove is formed in the shell, a control panel is fixedly arranged on the shell and electrically connected with a coil, a Hall device is arranged on the control panel, and the Hall device is electrically connected with the first magnet. The Hall device is spaced from the first magnet; when the output shaft rotates, the limiting piece is matched with the limiting groove to restrain the rotation amplitude of the output shaft, and the control panel can control a power source connected to the coil according to the position change of the first magnet relative to the Hall device so as to control the output shaft to rotate in a reciprocating mode within the amplitude range restrained by the limiting piece and the limiting groove. According to the utility model, through cooperation of the limiting piece, the limiting groove, the first magnet and the Hall device, the rotor assembly and the output shaft can be forced to rotate in a reciprocating manner in a predetermined angle range, angle constraint is provided through the limiting piece and the limiting groove, and more reliable rotation constraint can be realized without failure.

Description

Technical Field

[0001] The utility model relates to a brushless motor, in particular to a brushless motor device with reciprocating rotation. Background Art

[0002] As is well known, in a traditional vibration motor, a set of adjustable eccentric blocks are installed at both ends of the rotor core shaft, and the exciting force is obtained by the centrifugal force generated by the high-speed rotation of the shaft and the eccentric blocks. The vibration frequency range of the vibration motor is large, and only when the exciting power and the power are properly matched can the mechanical noise be reduced. Due to its use of an eccentric structure, its amplitude is uneven, the vibration frequency is not stable enough, and it is not easy to be miniaturized. Therefore, in order to meet different usage requirements, a vibration device that generates a magnetic field through an alternating current to make the rotor rotate slightly at a high frequency has been developed, such as the patented technical solution - a motor applied by the applicant before, with an application number of 2015100566771. For a motor with this structure, it can generate high-frequency small-amplitude vibrations, and its vibration frequency is high, and its application range is very wide. In order to restrict the rotation amplitude of the output shaft to facilitate the output shaft to return to the correct position, an elastic structure, such as a metal shrapnel structure or an S-shaped spring structure, is usually provided between the end of the output shaft and the housing. The elastic structure is arranged axially, one end is connected to the output shaft, and one end is connected to the housing, and it provides an effect for the output shaft to return to the correct position through elastic torsion. It is found in practice that by using the elastic structure to provide a rotation amplitude constraint for the output shaft, the elastic structure is prone to failure, and therefore, the provided constraint is not very effective. Summary of the Utility Model

[0003] The utility model aims to solve the above problems and provides a brushless motor device that can provide effective limit constraints and force the output shaft to reciprocate within a predetermined amplitude.

[0004] To solve the above problems, the utility model provides a brushless motor device with reciprocating rotation, which includes:

[0005] A housing,

[0006] An output shaft, which is arranged in the housing and at least one end extends out of the housing to form an output end;

[0007] A rotor assembly, which is arranged in the housing and is connected to the output shaft to rotate synchronously;

[0008] A stator assembly, which is fixedly arranged in the housing and surrounds the rotor assembly, and the stator assembly includes a coil;

[0009] It is characterized in that

[0010] A limiting member and a first magnet are arranged on the output shaft, and the limiting member and the first magnet can rotate synchronously with the output shaft;

[0011] A limiting groove for restricting the rotation amplitude of the limiting member is provided inside the housing. A control board is fixedly provided on the housing. The control board is electrically connected to the coil. A Hall device is provided on the control board, and the Hall device is spaced apart from the first magnet;

[0012] During operation, the stator assembly and the rotor assembly interact to drive the output shaft to rotate; when the output shaft rotates, the limiting member cooperates with the limiting groove to restrict the rotation amplitude of the output shaft, and the control board can control the power supply to the coil according to the position change of the first magnet relative to the Hall device to control the output shaft to rotate reciprocally within the amplitude range restricted by the limiting member and the limiting groove.

[0013] Further, the limiting member includes a sleeved portion and a limiting convex portion. The sleeved portion is sleeved on the output shaft and can rotate synchronously with the output shaft. The limiting convex portion protrudes from the sleeved portion and at least partially extends into the limiting groove, and the limiting convex portion can move in the limiting groove.

[0014] Further, the first magnet is annular and is sleeved on the output shaft.

[0015] Further, the housing includes a shell cylinder and an end cover which are connected in an opposing manner. The end cover is cylindrical, and the end away from the shell cylinder is open. The control board is connected in an opposing manner to the open end of the end cover to form a first accommodating cavity between the control board and the end cover.

[0016] The other end of the output shaft opposite to the output end passes through the shell cylinder and extends into the end cover;

[0017] The limiting member and the first magnet are arranged in the first accommodating cavity;

[0018] The rotor assembly and the stator assembly are arranged in the shell cylinder.

[0019] Further, a plurality of connecting convex portions protruding from the inner wall are provided on the inner wall of the end cover, and the connecting convex portions are spaced apart to form the limiting groove with the inner wall of the end cover.

[0020] Further, the control board is fixed on the end face of the connecting convex portion and is spaced apart from the end of the output shaft.

[0021] Further, a bearing seat is connected between the shell cylinder and the end cover. A first bearing is installed in the bearing seat, and the first bearing is sleeved on the non-end portion of the output shaft.

[0022] Further, the rotor assembly includes:

[0023] A rotor iron core, sleeved on the output shaft and capable of rotating synchronously with the output shaft;

[0024] The magnet group includes a plurality of second magnets, and the second magnets are evenly spaced on the circumferential wall of the rotor core.

[0025] Furthermore, the stator assembly includes a stator core, and the stator core includes a cylindrical main body portion and a plurality of magnetic shoe portions protruding from the inner wall of the main body portion. The magnetic shoe portions are evenly spaced and distributed on the outer side of the rotor assembly;

[0026] The coils are respectively sleeved on the magnetic shoe portions.

[0027] Furthermore, the stator assembly further includes a stator frame, and the stator frame is sleeved on the stator core to space the magnetic shoe portions and the coils;

[0028] A second bearing is provided at one end of the shell cylinder opposite to the end cover, and the second bearing is sleeved on the non-end portion of the output shaft.

[0029] The beneficial contribution of the present utility model lies in that it effectively solves the above problems. Through the cooperation of the limiting member, the limiting groove, the first magnet and the Hall device, the present utility model can force the rotor assembly and the output shaft to rotate reciprocally within a predetermined angle range. It provides angular constraints through the limiting member and the limiting groove, and can achieve more reliable rotational constraints without failure. The brushless motor device with reciprocating rotation of the present utility model has the characteristics of novel structure and practical function, and has strong practicability. Description of the Drawings

[0030] Figure 1 is a schematic exploded view of the structure of the present utility model.

[0031] Figure 2 is a schematic exploded view of the structure of the present utility model.

[0032] Figure 3 is Figure 2 another perspective schematic view of

[0033] Figure 4 is a longitudinal sectional view of the present utility model.

[0034] Figure 5 is a transverse sectional view of the present utility model.

[0035] Figure 6 is a transverse sectional view of the present utility model.

[0036] Figure 7 is a schematic exploded view of the partial structure of the present utility model.

[0037] Figure symbols: shell 10, limiting groove 11, shell cylinder 12, end cover 13, connecting protrusion 131, bearing seat 14, output shaft 20, output end 21, positioning portion 22, stator assembly 30, coil 31, stator core 32, main body 321, magnetic shoe portion 322, stator frame 33, rotor assembly 40, rotor core 41, magnet group 42, second magnet 421, limiting member 50, sleeve portion 51, limiting protrusion 52, through hole 53, first magnet 60, control board 70, first bearing 81, second bearing 82. DETAILED DESCRIPTION

[0038] The following embodiments are provided to further explain and supplement the present invention and do not constitute any limitation to the present invention.

[0039] like Figures 1 to 7 As shown, the reciprocating brushless motor device of the present invention includes a housing 10, an output shaft 20, a stator assembly 30, a rotor assembly 40, a stopper 50, a first magnet 60, a control board 70, and a Hall device.

[0040] The housing 10 is used to provide a cavity for installing the stator assembly 30, the rotor assembly 40, the stopper 50 and other components. The output shaft 20 is arranged in the housing 10, and at least one end extends out of the housing 10 to form an output end 21, which is used to output high-frequency vibration to the outside. The output end 21 is used to connect the object to be driven, such as a toothbrush head and other devices. The rotor assembly 40 is arranged in the housing 10 and connected to the output shaft 20. The rotor assembly 40 can rotate synchronously with the output shaft 20. The stator assembly 30 is fixedly arranged in the housing 10 and surrounded by the rotor assembly 40. The stator assembly 30 includes a coil 31, which is used to generate virtual magnetic poles on the stator assembly 30 by passing a working power supply, thereby interacting with the rotor assembly 40 to drive the rotor assembly 40 and the output shaft 20 to rotate at high frequency.

[0041] The main points of the utility model are that a limiter 50 and a first magnet 60 are provided on the output shaft 20, a limiter slot 11 and a control board 70 are provided on the housing 10, and a Hall device is provided on the control board 70. Through the cooperation of the limiter 50 and the limiter slot 11, the output shaft 20 can be limited to rotate within a certain range, thereby constraining the rotation amplitude of the output shaft 20; through the Hall device and the first magnet 60, the rotation of the output shaft 20 can be determined, so that the power supplied to the coil 31 is controlled through the control board 70 to control the reciprocating rotation of the output shaft 20. Through the limiter 50, the limiter slot 11, the first magnet 60 and the Hall device, the rotor assembly 40 and the output shaft 20 can be forced to perform commutation rotation, thereby limiting the output shaft 20 and the rotor assembly 40 to reciprocate within the amplitude range constrained by the limiter 50 and the limiter slot 11.

[0042] The limiting member 50 is provided on the output shaft 20 and can rotate synchronously with the output shaft 20. To restrict the rotation amplitude of the limiting member 50, a limiting groove 11 is provided in the housing 10. At least a part of the limiting member 50 is located in the limiting groove 11 and can move within the limiting groove 11. Through the limiting groove 11, the limiting member 50 can be restricted to rotate within a certain range, so that the output shaft 20 and the rotor assembly 40 can only rotate within a predetermined angular range and cannot rotate 360°, which is beneficial to the reverse rotation of the output shaft 20.

[0043] The first magnet 60 is provided on the output shaft 20 and can rotate synchronously with the output shaft 20. The control board 70 is fixedly provided on the housing 10 and is electrically connected to the coil 31. A Hall device is fixedly provided on the control board 70 and is electrically connected to the control board 70. The Hall device can sense the position change of the first magnet 60, so as to detect the rotation condition of the output shaft 20. In this way, the control board 70 can control the power supply applied to the coil 31 according to the situation to make the output shaft 20 rotate reversely. In this way, the output shaft 20 can rotate reciprocally within the amplitude range restricted by the limiting member 50 and the limiting groove 11.

[0044] Further, the limiting member 50 includes a sleeving portion 51 and a limiting convex portion 52. The sleeving portion 51 and the limiting convex portion 52 are integrally formed or fixedly connected. The material of the limiting member 50 is not limited. In this embodiment, it can be made of plastic material. The sleeving portion 51 is sleeved on the output shaft 20 and can rotate synchronously with the output shaft 20. The limiting convex portion 52 protrudes from the sleeving portion 51 and at least partially extends into the limiting groove 11. When the output shaft 20 rotates, the limiting convex portion 52 can move in the limiting groove 11. Through the cooperation of the limiting groove 11 and the limiting convex portion 52, the rotation amplitude of the output shaft 20 can be restricted.

[0045] Further, the limiting convex portion 52 protrudes from the sleeving portion 51 in a radially extending manner. In other embodiments, the limiting convex portion 52 can also protrude from the sleeving portion 51 in an axially extending manner. Correspondingly, the position of the limiting groove 11 can be changed adaptively.

[0046] The connection between the limiting convex portion 52 and the output shaft 20 only needs to prevent relative rotation between the two. In this embodiment, a positioning portion 22 is provided at a corresponding position of the output shaft 20. The positioning portion 22 is recessed with respect to the circumferential surface of the output shaft 20 to be planar, so that the output shaft 20 is non-circular at this position, and thus has an anti-rotation function. Correspondingly, a through hole 53 is provided on the sleeving portion 51. The shape of the through hole 53 matches the shape of the output shaft 20. In this embodiment, the through hole 53 is D-shaped and is in interference fit with the output shaft 20, so that the sleeving portion 51 and the output shaft 20 are connected together and can rotate synchronously.

[0047] The shape of the sleeving portion 51 is not limited. In this embodiment, it is in a circular block shape.

[0048] The shape of the limiting convex portion 52 is not limited. In this embodiment, it is in a rectangular block shape.

[0049] The limiting member 50 can be sleeved on the end of the output shaft 20 or on a non-end portion. In this embodiment, the limiting member 50 is sleeved on the proximal end of the output shaft 20 and is away from the output end 21 of the output shaft 20.

[0050] The limiting groove 11 is provided on the housing 10. In this embodiment, the housing 10 includes a shell cylinder 12 and an end cover 13 which are connected in an abutting manner.

[0051] The shell cylinder 12 is in a cylindrical shape, and a second accommodation cavity is formed inside it for installing the rotor assembly 40 and the stator assembly 30.

[0052] The end cover 13 is connected in an abutting manner to one end of the shell cylinder 12 away from the output end 21. The end cover 13 is in a cylindrical shape, and a first accommodation cavity is formed inside it. One end of the end cover 13 away from the shell cylinder 12 is in an open shape, and it can be fixedly connected to the control board 70, and at least a part of the open end of the end cover 13 can be closed through the control board 70.

[0053] The output shaft 20 is provided inside the shell cylinder 12 and the end cover 13. The output end 21 of the output shaft 20 passes through the shell cylinder 12 and extends out of the shell cylinder 12. The other end of the output shaft 20 passes through the shell cylinder 12 and extends into the end cover 13. The limiting member 50 and the first magnet 60 are sleeved on one end of the output shaft 20 away from the output shaft 20 and are located in the first accommodation cavity.

[0054] To form the limiting groove 11 and for the convenience of fixing the control board 70, a plurality of connecting convex portions 131 are provided on the inner wall of the end cover 13. The connecting convex portions 131 protrude from the inner wall of the end cover 13, and the connecting convex portions 131 are spaced apart from each other, thus forming a vacant position, and this vacant position and the inner wall of the end cover 13 form the limiting groove 11. The distance between the spaced connecting convex portions 131 can be set as required. The shape of the connecting convex portions 131 is not limited.

[0055] For the convenience of fixing the control board 70, screw holes or mounting holes are provided on the connecting convex portions 131. The control board 70 is fixed to the end face of the connecting convex portions 131 through fasteners such as screws and bolts, and is spaced apart from the end of the output shaft 20, so as not to interfere with the rotation of the output shaft 20.

[0056] The material for making the end cover 13 is not limited. In this embodiment, it is made of plastic, and the connecting convex portions 131 and the end cover 13 are integrally formed.

[0057] The free end of the limiting convex portion 52 extends into the limiting groove 11. When the output shaft 20 rotates, the limiting convex portion 52 can abut against the connecting convex portion 131, thereby restricting the rotation range of the limiting convex portion 52, and further restricting the rotation amplitude of the output shaft 20.

[0058] The first magnet 60 is sleeved on the output shaft 20 and is spaced opposite to the control board 70. In this embodiment, the first magnet 60 is annular, sleeved on the end of the output shaft 20, and abuts against the limiting member 50.

[0059] Furthermore, a bearing seat 14 is also connected between the shell cylinder 12 and the end cover 13. A first bearing 81 is installed on the bearing seat 14. The first bearing 81 is sleeved on the output shaft 20 and is used to support the rotation of the output shaft 20.

[0060] The bearing seat 14 not only facilitates the rotation of the output shaft 20, but also can play an isolation role, separating the first accommodation cavity and the second accommodation cavity, and avoiding the magnetic interaction between the stator assembly 30 and the rotor assembly 40 and the magnetic interaction between the Hall device and the first magnet 60 from interfering with each other, thereby being beneficial to improving the control accuracy.

[0061] The shape of the bearing seat 14 is not limited. In this embodiment, it is disc-shaped, and a cavity recessed toward the end cover 13 is provided in the middle thereof, and the first bearing 81 is installed in the cavity.

[0062] For the convenience of installation, the bearing seat 14 is lapped between the end cover 13 and the shell cylinder 12. When the end cover 13 and the shell cylinder 12 are aligned, the bearing seat 14 is at least partially clamped between the end cover 13 and the shell cylinder 12. Between the end cover 13 and the bearing seat 14, they can also be fixed by fasteners.

[0063] Further, the rotor assembly 40 includes a rotor core 41 and a magnet group 42.

[0064] The rotor core 41 is sleeved on the output shaft 20, and both ends of the output shaft 20 extend out of both ends of the rotor core 41. The rotor core 41 is formed by laminating a plurality of silicon steel sheets or silicon steel laminations. The rotor core 41 is integrally cylindrical and has a symmetric structure.

[0065] To install the magnet group 42, a plurality of installation grooves are provided on the circumferential outer wall of the rotor core 41. The installation grooves are long strip-shaped grooves, which are arranged along the axial direction of the rotor core 41 and extend from one end of the rotor core 41 to the other end. In this embodiment, the installation grooves are evenly spaced. The number of the installation grooves can be set as required. In this embodiment, 4 installation grooves are provided on the circumferential outer wall of the rotor core 41.

[0066] The magnet group 42 includes a plurality of second magnets 421. The number of the second magnets 421 is the same as the number of the installation grooves, and it includes 4 long strip-shaped second magnets 421. The second magnets 421 are fixedly embedded in the installation grooves and can rotate synchronously with the rotor core 41.

[0067] The pole arrangement of the second magnets 421 can refer to known techniques.

[0068] The stator assembly 30 includes a stator core 32 and a coil 31. Further, it may also include a stator frame 33.

[0069] The stator core 32 is fixedly arranged in the housing 10. Specifically, it is fixedly arranged in the shell cylinder 12.

[0070] The stator core 32 includes a cylindrical main body portion 321 and a plurality of magnetic shoe portions 322 protruding from the inner wall of the main body portion 321. The magnetic shoe portions 322 are used for winding the coil 31 and generating magnetic poles.

[0071] The circumferential outer wall of the main body portion 321 is arranged in fit with the circumferential inner wall of the shell cylinder 12. To fix the stator core 32, an interference fit may be adopted between the main body portion 321 and the shell cylinder 12. Further, an adhesive may also be arranged between the main body portion 321 and the shell cylinder 12, so that the main body portion 321 and the shell cylinder 12 are bonded together and are not easily separated.

[0072] The magnetic shoe parts 322 are evenly distributed in the main body part 321. The number of the magnetic shoe parts 322 can be set as required. In this embodiment, 6 magnetic shoe parts 322 are evenly provided. The ends of the magnetic shoe parts 322 are spaced from each other and generally enclose a cylindrical space, and the rotor assembly 40 is arranged in the cylindrical space. The magnetic shoe parts 322 are distributed outside the rotor assembly 40 and are spaced from the rotor assembly 40, and the rotor assembly 40 can rotate within the magnetic shoe parts 322.

[0073] The coils 31 are respectively sleeved on the magnetic shoe parts 322. In this embodiment, a total of 6 coils 31 are provided, and one coil 31 is respectively sleeved on each magnetic shoe part 322. The coils 31 are respectively connected to the control board 70. Through the control board 70, the current direction of the coils 31 can be controlled, so as to control the generation of the required virtual magnetic poles on the magnetic shoe parts 322.

[0074] The stator frame 33 is sleeved on the stator core 32, and it spaces the magnetic shoe parts 322 and the coils 31. The shape of the stator frame 33 matches that of the stator core 32. It fits on the circumferential inner wall of the main body part 321 and allows the magnetic shoe parts 322 to pass through. It surrounds the magnetic shoe parts 322 so that the coils 31 are sleeved on the upper part of the magnetic shoe parts 322 and are in direct contact with the magnetic shoe parts 322. In addition, convex column parts extending axially are respectively provided at the top and bottom of the stator frame 33, which are used to restrain the coils 31 to prevent the coils 31 from loosening.

[0075] To support the rotation of the output shaft 20, a second bearing 82 is provided at the other end of the shell cylinder 12 opposite to the end cover 13. The second bearing 82 is sleeved on the non-end part of the output shaft 20. The output shaft 20 is supported by the first bearing 81 and the second bearing 82 and can rotate more smoothly.

[0076] Thus, the brushless motor device with reciprocating rotation of the present utility model is formed. When the coil 31 is energized, virtual magnetic poles are generated on the magnetic shoe portion 322, and the virtual magnetic poles interact with the second magnet 421 in the magnet group 42, so as to drive the rotation of the rotor assembly 40, and then drive the rotation of the output shaft 20. Since the limiting member 50 is sleeved on the output shaft 20 and the limiting member 50 can only rotate within the range of the limiting groove 11, the output shaft 20 can only rotate within a limited range; when the limiting member 50 interferes with the connecting convex portion 131, the output shaft 20 cannot continue to rotate and can only rotate in the reverse direction. Since the first magnet 60 is provided on the output shaft 20 and the Hall device is provided on the control board 70, the rotation condition of the output shaft 20 can be detected. When reverse rotation is required, the power supply applied to the coil 31 can be controlled through the control board 70, so that the virtual magnetic poles generated on the magnetic shoe portion 322 change, thereby driving the rotor assembly 40 and the output shaft 20 to rotate in the reverse direction. Through the cooperation of the limiting member 50, the limiting groove 11, the first magnet 60 and the Hall device, the rotor assembly 40 and the output shaft 20 can be forced to rotate reciprocally within a predetermined angular range, so as to obtain the required high-frequency vibration.

[0077] Although the present utility model is disclosed through the above embodiments, the scope of the present utility model is not limited thereto. Without departing from the concept of the present utility model, the above components can be replaced by similar or equivalent elements known to those skilled in the art.

Claims

1. A reciprocating brushless motor device, comprising: Housing (10), An output shaft (20) is disposed in the housing (10) and has at least one end extending out of the housing (10) to form an output end (21); A rotor assembly (40) is disposed in the housing (10) and is connected to the output shaft (20) so as to be able to rotate synchronously; A stator assembly (30) fixedly disposed in the housing (10) and surrounded by the rotor assembly (40), the stator assembly (30) comprising a coil (31); It is characterized in that A limit piece (50) and a first magnet (60) are provided on the output shaft (20), and the limit piece (50) and the first magnet (60) can rotate synchronously with the output shaft (20); A limiting groove (11) for restricting the rotation range of the limiting member (50) is provided in the housing (10); a control board (70) is fixedly provided on the housing (10); the control board (70) is electrically connected to the coil (31); a Hall device is provided on the control board (70); and the Hall device is spaced apart from the first magnet (60); During operation, the stator assembly (30) and the rotor assembly (40) interact with each other to drive the output shaft (20) to rotate; when the output shaft (20) rotates, the limiting member (50) cooperates with the limiting slot (11) to constrain the rotation amplitude of the output shaft (20), and the control board (70) can control the power supplied to the coil (31) according to the position change of the first magnet (60) relative to the Hall device to control the output shaft (20) to reciprocate within the amplitude range constrained by the limiting member (50) and the limiting slot (11).

2. The reciprocating brushless motor device according to claim 1, characterized in that: The limiting member (50) comprises a sleeve portion (51) and a limiting convex portion (52); the sleeve portion (51) is sleeved on the output shaft (20) and can rotate synchronously with the output shaft (20); the limiting convex portion (52) protrudes from the sleeve portion (51) and at least partially extends into the limiting groove (11); the limiting convex portion (52) can move in the limiting groove (11).

3. The reciprocating brushless motor device according to claim 2, characterized in that: The first magnet (60) is ring-shaped and sleeved on the output shaft (20).

4. The reciprocating brushless motor device according to claim 2, characterized in that: The housing (10) comprises a shell cylinder (12) and an end cover (13) which are connected in abutment with each other. The end cover (13) is cylindrical and one end away from the shell cylinder (12) is open. The control panel (70) is connected in abutment with the open end of the end cover (13) to form a first accommodation cavity between the control panel (70) and the end cover (13). The other end of the output shaft (20) opposite to the output end (21) passes through the shell cylinder (12) and extends into the end cover (13); The limiting member (50) and the first magnet (60) are arranged in the first accommodating cavity; The rotor assembly (40) and the stator assembly (30) are arranged in the shell (12).

5. The reciprocating brushless motor device according to claim 4, characterized in that: A plurality of connection protrusions (131) protruding from the inner wall of the end cover (13) are provided on the inner wall thereof, and the connection protrusions (131) are spaced apart to form the limiting grooves (11) with the inner wall of the end cover (13).

6. The reciprocating brushless motor device according to claim 5, characterized in that: The control plate (70) is fixed on the end surface of the connecting protrusion (131) and is spaced apart from the end of the output shaft (20).

7. The reciprocating brushless motor device according to claim 4, characterized in that: A bearing seat (14) is connected between the shell cylinder (12) and the end cover (13), a first bearing (81) is mounted in the bearing seat (14), and the first bearing (81) is sleeved on the non-end portion of the output shaft (20).

8. The reciprocating brushless motor device according to any one of claims 1 to 7, characterized in that: The rotor assembly (40) comprises: A rotor core (41) is sleeved on the output shaft (20) and can rotate synchronously with the output shaft (20); The magnet group (42) comprises a plurality of second magnets (421), wherein the second magnets (421) are arranged at even intervals on the circumferential wall of the rotor core (41).

9. The reciprocating brushless motor device according to any one of claims 4 to 7, characterized in that: The stator assembly (30) comprises a stator core (32), the stator core (32) comprising a cylindrical main body (321) and a plurality of magnetic shoe portions (322) protruding from the inner wall of the main body (321), the magnetic shoe portions (322) being evenly spaced and distributed on the outer side of the rotor assembly (40); The coils (31) are respectively sleeved on the magnetic shoe portions (322).

10. The reciprocating brushless motor device according to claim 9, characterized in that: The stator assembly (30) further comprises a stator frame (33), wherein the stator frame (33) is sleeved on the stator core (32) and separates the magnetic shoe portion (322) and the coil (31); A second bearing (82) is provided at one end of the shell cylinder (12) opposite to the end cover (13), and the second bearing (82) is sleeved on the non-end portion of the output shaft (20).

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