Electric toothbrush motor assembly, brush handle assembly and electric toothbrush

Abstract

To provide a motor assembly for an electric toothbrush which improves mounting stability of a position feedback member.SOLUTION: A motor assembly for an electric toothbrush includes: a motor main body in which an output shaft is provided; a mounting seat 20 in which a mounting groove is provided at a circumferential side of a connection hole 21, the connection hole being opened at the mounting seat, the mounting seat being sleeved while being fixed to the output shaft via the connection hole so as to be rotated together with the output shaft, and the mounting groove being provided at the mounting seat; a position feedback member 30 which is mounted in the mounting groove so as to be rotated together with the output shaft; and a position sensor 40 for detecting a motion position of the position feedback member, the position sensor being installed with a space from the mounting seat and positioned at a side toward which a notch of the mounting groove is directed.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present application relates to the field of electric toothbrush technology, and more particularly to a motor assembly for an electric toothbrush, a brush handle assembly for an electric toothbrush, and an electric toothbrush. [Background technology]

[0002] The electric toothbrush includes a brush handle assembly and a brush head assembly, the brush handle assembly including a brush handle case, a motor assembly, and a battery, the battery charges the motor assembly, and the output shaft of the motor assembly can drive the brush head assembly to vibrate or oscillate back and forth. In the related art, the motor assembly controls the rotation amplitude of the output shaft via a control panel and a position sensor to control the oscillation amplitude of the brush head assembly, and the position sensor requires an appropriate position feedback member to improve detection accuracy, but the installation of the position feedback member is not stable enough, ultimately resulting in a relatively poor control effect on the brush head assembly.

[0003] The above content is only intended to aid in understanding the technical solution of the present invention, and is not intended to acknowledge that the above content is prior art. Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the above problems, the present invention provides a motor assembly for an electric toothbrush to solve the technical problem that the mounting of the position feedback member is not stable enough, which ultimately results in a relatively poor control effect on the brush head assembly. [Means for solving the problem]

[0005] In order to achieve the above object, the motor assembly of the electric toothbrush according to the present invention comprises: a motor body provided with an output shaft; a mounting seat having a connection hole formed therein, the mounting seat being fixed to the output shaft via the connection hole so as to rotate together with the output shaft, and the mounting seat having a mounting groove formed on a circumferential side of the connection hole; a position feedback member mounted in the mounting groove so as to rotate together with the output shaft; The position sensor is disposed at a distance from the mounting seat, is positioned on the side of the mounting groove facing the notch, and detects the movement position of the position feedback member.

[0006] In one embodiment, the mounting groove extends annularly around the outer periphery of the connecting hole, and the position feedback member is disposed annularly so as to be compatible with mounting within the mounting groove.

[0007] In one embodiment, the mounting seat includes an inner peripheral wall, an outer peripheral wall, and a bottom wall connecting the inner peripheral wall and the outer peripheral wall, the inner peripheral wall, the outer peripheral wall and the bottom wall jointly surrounding each other to form the mounting groove, and the inner peripheral wall surrounding each other to form the connecting hole.

[0008] In one embodiment, the end of the inner peripheral wall adjacent to the position sensor protrudes from the end of the position feedback member remote from the bottom wall.

[0009] In one embodiment, the end of the position feedback member remote from the bottom wall protrudes beyond the end of the outer circumferential wall adjacent to the position sensor.

[0010] In one embodiment, the output shaft has an output end and a feedback end, the output end is used for connecting to a brush handle assembly of an electric toothbrush, and the mounting seat is fitted to the feedback end.

[0011] In one embodiment, the notch of the mounting groove is spaced apart from the output end.

[0012] In one embodiment, the motor assembly further includes a circuit board, the circuit board being attached to one side of the feedback end in the longitudinal direction of the output shaft, and the position sensor being attached to the circuit board.

[0013] In one embodiment, the motor body includes a motor housing, the output shaft is rotatably attached to the motor housing, and the output end and the feedback end extend from opposite ends of the motor housing, respectively; The motor assembly further includes a connecting shell connected to a side of the motor housing closer to the feedback end and surrounded by the feedback end, and the circuit board is capped at the end of the connecting shell away from the motor housing.

[0014] In one embodiment, the motor body further includes a bearing, the bearing is attached to an end of the motor housing close to the feedback end, the output shaft is fixedly fitted to an inner ring of the bearing, and a stopper portion is protruded on the side of the mounting seat facing away from the mounting groove, the stopper portion being arranged along the circumferential direction of the connecting hole and abutting against the inner ring of the bearing.

[0015] In one embodiment, the motor body further includes a bottom cover, the bottom cover is interposed between the connecting shell and the inner cavity of the motor housing, the feedback end passes through the bottom cover, a support groove is provided on the side of the bottom cover away from the mounting seat, and the bearing is mounted in the support groove; A positioning protrusion is provided on the peripheral wall of the bottom cover, a positioning groove is provided on the end wall of the motor housing, and the positioning protrusion is positioned and fitted into the positioning groove, and / or a wiring notch is provided on the peripheral wall of the bottom cover to allow conductors to pass between the circuit board and the motor body.

[0016] In one embodiment, the mounting seat is implemented as a copper member, and / or the position feedback member is implemented as a magnetic member and the position sensor is implemented as a Hall sensor.

[0017] In one embodiment, the magnetic member has at least two opposite magnetic poles, the number of the position sensors is two, the two position sensors are spaced apart along the circumferential direction of the output shaft, and the two position sensors are used to induce the two opposite magnetic poles of the magnetic member, respectively.

[0018] The present invention further provides a brush handle assembly for an electric toothbrush, the brush handle assembly for an electric toothbrush including a brush handle case, a battery, and the electric toothbrush motor assembly described above, wherein the battery is electrically connected to the motor assembly, the battery and the motor assembly are both mounted within the brush handle case, and the output shaft of the motor assembly extends from the brush handle case.

[0019] The present invention further provides an electric toothbrush, the electric toothbrush including a brush head assembly and a brush handle assembly of the electric toothbrush described above, wherein the brush head assembly is removably connected to the output shaft of the motor assembly. [Effects of the Invention]

[0020] In the technical solution of the electric toothbrush motor assembly according to the present invention, the position feedback member is attached to the output shaft via a mounting seat, thereby improving the mounting stability of the position feedback member and reducing the pressing force on the position feedback member during mounting, thereby preventing damage to the position feedback member or instability in its movement process. The improved mounting stability and structural stability of the position feedback member improve the reliability of the position detection result of the position sensor for the position feedback member, thereby improving the control effect on the oscillation process of the brush head assembly. [Brief explanation of the drawings]

[0021] In order to more clearly explain the technical solutions in the embodiments of the present application, the drawings necessary for describing the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without exerting any creative efforts. [Figure 1] 1 shows a structural schematic diagram of an embodiment of a motor assembly of the present invention. [Figure 2] 1 is a cross-sectional schematic view of one embodiment of a motor assembly of the present invention. [Figure 3] FIG. 3 is an enlarged view of a portion A in FIG. 2. [Figure 4] FIG. 2 is an exploded structural view of an embodiment of a motor assembly of the present invention. [Figure 5] 1 is an exploded cross-sectional view of the structure of an embodiment of a motor assembly of the present invention. [Figure 6] FIG. 6 is an enlarged view of a portion B in FIG. 5. [Figure 7] 3 is a structural schematic diagram of a position feedback member and a mounting seat according to the present invention; FIG. [Figure 8] 1 is a structural schematic diagram of an embodiment of a brush handle assembly of an electric toothbrush according to the present invention; [Figure 9] 1 is a structural schematic diagram of an embodiment of an electric toothbrush.

[0022] The realization of the object, the function features and advantages of the present invention will be further explained with reference to the drawings in conjunction with the embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, the technical solutions in the embodiments of the present application will be clearly and completely explained with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained based on the embodiments of the present application without the need for creative efforts by those skilled in the art are within the scope of protection of the present application. Furthermore, the technical solutions in each embodiment may be combined with each other, but this must be realized by those skilled in the art. If the combination of technical solutions is contradictory or cannot be realized, such combination of technical solutions does not exist and should not be considered to be within the scope of protection claimed by the present invention.

[0024] It should be noted that in the embodiments of the present invention, when there are directional instructions (e.g., up, down, left, right, front, back, etc.), the directional instructions are merely for interpreting the relative positional relationships and movement conditions of each component in a particular posture, and when the particular posture changes, the directional instructions also change accordingly.

[0025] Furthermore, when descriptions such as "first" and "second" appear in the embodiments of the present invention, the descriptions such as "first" and "second" are for explanatory purposes only and should not be understood as expressing or suggesting the relative importance of or implicitly indicating the number of technical features to be shown. Therefore, a feature defined by "first" or "second" may explicitly or implicitly include one or more of the feature. Furthermore, "and / or" in this specification means including three parallel solutions, and for example, "A and / or B" includes solution A, solution B, or a solution in which both A and B are satisfied.

[0026] The present invention provides a motor assembly for an electric toothbrush 400 .

[0027] In an embodiment of the present invention, as shown in FIGS. 1 to 6 , the motor assembly includes a motor body 10, a mounting seat 20, a position feedback member 30, and a position sensor 40. The motor body 10 is provided with an output shaft 11. The mounting seat 20 has a connecting hole 21. The mounting seat 20 is fixed to the output shaft 11 through the connecting hole 21 so as to rotate together with the output shaft 11. The mounting seat 20 has a mounting groove 22 formed around the connecting hole 21. The position feedback member 30 is mounted in the mounting groove 22 so as to rotate together with the output shaft 11. The position sensor 40 is installed at a distance from the mounting seat 20 and is located on the side of the mounting groove 22 facing the notch. The position sensor 40 is used to detect the movement position of the position feedback member 30.

[0028] In this embodiment, the motor body 10 includes a motor stator and a motor rotor, and the output shaft 11 is connected to the motor rotor. The output shaft 11 is used to connect the brush head assembly 300 of the electric toothbrush so that the motor body 10 can drive the rotation of the brush head assembly 300. The specific shape of the mounting base 20 is not limited, as long as it has a connecting hole 21 and a mounting groove 22. The connecting hole 21 may be located in the center of the mounting base 20, and the opening direction of the mounting groove 22 may be parallel to the longitudinal direction of the output shaft 11 or perpendicular to the longitudinal direction of the output shaft 11. If the opening direction of the mounting groove 22 is parallel to the longitudinal direction of the output shaft 11, the position sensor 40 is located on the side of the mounting base 20 that is parallel to the longitudinal direction of the output shaft 11. If the opening direction of the mounting groove 22 is perpendicular to the longitudinal direction of the output shaft 11, i.e., if the mounting groove 22 is opened on the peripheral wall of the mounting base 20, the position sensor 40 is located on the peripheral side of the mounting base 20.

[0029] The mounting seat 20 may be a plastic member or a metal member, and specifically, may be a copper member in order to improve the structural strength of the mounting seat 20 and the connection stability between the mounting seat 20 and the output shaft 11.

[0030] The method of fixing the mounting seat 20 to the output shaft 11 may be by fixedly fitting via the connecting hole 21, or by bonding the hole wall of the connecting hole 21 to the output shaft 11, and is not limited thereto as long as the mounting seat 20 can rotate synchronously with the output shaft 11. The shape of the position feedback member 30 is not limited thereto and may be block-like, spherical, annular, etc., and the shape of the mounting groove 22 corresponds to the shape of the position feedback member 30, and the position feedback member 30 is fixedly fitted into the mounting groove 22 so that the position feedback member 30 can rotate synchronously with the output shaft 11.

[0031] The position sensor 40 may be a laser sensor or a Hall sensor, and is not limited thereto, as long as it can detect the movement position of the position feedback member 30, and the movement position of the position feedback member 30 can reflect the movement position of the brush head assembly 300. The motor assembly further includes a circuit board 50, which is electrically connected to the position sensor 40 and the motor body 10, and the circuit board 50 can control the reversal of the output shaft 11 when the position feedback member 30 reaches a predetermined position, thereby controlling the brush head assembly 300 to oscillate back and forth.

[0032] By mounting the position feedback member 30 on the output shaft 11 via the mounting seat 20, the mounting stability of the position feedback member 30 is improved, the pressing force on the position feedback member 30 during mounting is reduced, and damage to the position feedback member 30 or instability in its movement process can be avoided. The improved mounting stability and structural stability of the position feedback member 30 improve the reliability of the position detection result of the position feedback member 30 by the position sensor 40, thereby improving the control effect on the oscillation process of the brush head assembly 300.

[0033] 4 and 7, the mounting groove 22 extends annularly around the outer periphery of the connecting hole 21, and the position feedback member 30 is disposed annularly so as to be suitable for mounting in the mounting groove 22. In this way, the fitting area between the position feedback member 30 and the mounting groove 22 can be increased, and the fitting stability between the position feedback member 30 and the mounting groove 22 can be further improved.

[0034] 4 and 7, the mounting seat 20 includes an inner peripheral wall 23, an outer peripheral wall 24, and a bottom wall 25 connecting the inner peripheral wall 23 and the outer peripheral wall 24, and the inner peripheral wall 23, the outer peripheral wall 24, and the bottom wall 25 together form the mounting groove 22, where the bottom wall 25 forms the groove bottom of the mounting groove 22, and the inner peripheral wall 23 forms the connecting hole 21. In this way, the structure of the mounting seat 20 can be simplified, the center of gravity of the mounting seat 20 can be more uniformly distributed, and the rotational stability of the mounting seat 20 can be improved.

[0035] In actual application, as shown in FIG. 3 , the end of the inner peripheral wall 23 adjacent to the position sensor 40 protrudes from the end of the position feedback member 30 away from the bottom wall 25. In this way, the axial size of the connecting hole 21 is increased, and the fitting area between the connecting hole 21 and the output shaft 11 is enlarged, thereby further improving the fitting stability between the connecting hole 21 and the output shaft 11.

[0036] 3, the end of the position feedback member 30 away from the bottom wall 25 protrudes from the end of the outer peripheral wall 24 adjacent to the position sensor 40. In this way, the machining process (e.g., cutting) of the mounting seat 20 can be simplified, and machining efficiency can be improved.

[0037] The mounting seat 20 may be fitted in the middle of the output shaft 11 or in the end of the output shaft 11. Exemplarily, as shown in Figures 3 to 6, the output shaft 11 has an output end 111 and a feedback end 112. The output end 111 is used to connect to the brush handle assembly 200 of the electric toothbrush 400, and the mounting seat 20 is fitted in the feedback end 112. The middle portion of the output shaft 11 is fitted to the motor rotor, the output end 111 is used to connect to the brush handle assembly 200, and the feedback end 112 is used to connect to the position feedback member 30, thereby making efficient use of the overall length of the output shaft 11 and reducing interference between the mounting seat 20, the position feedback member 30, and other components of the motor body 10. Specifically, as shown in FIG. 3, the notch of the mounting groove 22 is away from the output end 111, and thus the position sensor 40 may be provided on the side away from the output end 111 of the mounting seat 20, so as to simplify the installation process of the position sensor 40.

[0038] 3 to 6, in actual application, the motor assembly further includes a circuit board 50, which is mounted on one side of the feedback end 112 in the longitudinal direction of the output shaft 11, and the position sensor 40 is mounted on the circuit board 50. By directly mounting the position sensor 40 on the circuit board 50, it is possible to omit the conductor wires between the position sensor 40 and the circuit board 50, and there is no need to install an additional support structure for the position sensor 40, making the internal structure of the motor assembly simpler and more compact.

[0039] For example, as shown in Figures 4 to 6, the motor body 10 includes a motor housing 12, the output shaft 11 is rotatably attached to the motor housing 12, the output end 111 and the feedback end 112 extend from opposite ends of the motor housing 12, respectively, the motor assembly further includes a connecting shell 60, the connecting shell 60 is connected to the side of the motor housing 12 closer to the feedback end 112 and is surrounded by the feedback end 112, and the circuit board 50 is provided with a cover at the end of the connecting shell 60 away from the motor housing 12.

[0040] The motor housing 12 extends along the longitudinal direction of the output shaft 11. When assembling the motor assembly, the motor body 10 may be assembled and molded independently first, as long as both ends of the output shaft 11 extend beyond both ends of the motor housing 12. After assembling and molding the motor body 10, the mounting seat 20 is first fitted to the feedback end 112, the position feedback member 30 is attached, the connecting shell 60 is then attached to the motor housing 12, and finally the circuit board 50, on which the position sensor 40 is mounted, is attached to the connecting shell 60, thereby simplifying the assembly method of the motor assembly and improving the assembly efficiency of the motor assembly.

[0041] Specifically, as shown in Figures 3 to 6, the motor body 10 further includes a bearing 13, which is attached to the end of the motor housing 12 close to the feedback end 112, the output shaft 11 is fixedly fitted to the inner ring of the bearing 13, and a stopper portion 26 is protruded from the side of the mounting seat 20 that faces away from the mounting groove 22, and the stopper portion 26 is arranged along the circumferential direction of the connecting hole 21, and the stopper portion 26 abuts against the inner ring of the bearing 13.

[0042] The bearing 13 improves the rotational stability of the feedback end 112 of the output shaft 11 and can prevent the feedback end 112 from shifting from the rotation axis, which would distort the position detection results of the position feedback member 30. By abutting the stopper portion 26 of the mounting seat 20 against the inner ring of the bearing 13, a sufficient pitch can be provided between the outer ring of the bearing 13 and the mounting seat 20, preventing interference with the rotation of the mounting seat 20 and improving the rotational stability of the mounting seat 20.

[0043] The space enclosed by the connecting shell 60 may penetrate the inner cavity of the motor housing 12 or may be separated from the inner cavity of the motor housing 12 .

[0044] In actual application, as shown in Figures 4 to 6, the motor body 10 further includes a bottom cover 14, which is interposed between the connecting shell 60 and the inner cavity of the motor housing 12. The feedback end 112 passes through the bottom cover 14. A support groove 141 is formed on the side of the bottom cover 14 away from the mounting seat 20, and the bearing 13 is mounted in the support groove 141. A positioning protrusion 142 is formed on the peripheral wall of the bottom cover 14. A positioning groove 121 is formed on the end wall of the motor housing 12, and the positioning protrusion 142 is positioned and fitted into the positioning groove 121. And / or a wiring notch 143 is formed on the peripheral wall of the bottom cover 14 to allow the conductive wires between the circuit board 50 and the motor body 10 to pass through.

[0045] The bottom cover 14 may provide support for the bearing 13 and may also be used to connect the connecting shell 60, thereby improving the installation stability of the bearing 13 and the connecting shell 60. Specifically, a fixing boss is protruded from the inner wall surface of the motor housing 12, and a fixing hole is formed in the fixing boss. The connecting shell 60 has a first through-hole corresponding to the fixing hole. The bottom cover 14 has a second through-hole corresponding to the first through-hole. The fixing hole, the first through-hole, and the second through-hole may be connected via a fastener to securely connect the motor housing 12, the bottom cover 14, and the connecting shell 60. The positioning protrusion 142 is fitted into the positioning groove 121, which provides a foolproof alignment between the second through-hole and the fixing hole and also enables the bottom cover 14 and the motor housing 12 to be pre-fixed in advance.

[0046] For example, the position feedback member 30 is installed as a magnetic member, and the position sensor 40 is installed as a Hall sensor. The position sensor 40 detects the position of the position feedback member 30 by magnetic induction, thereby improving the reliability of the detection result.

[0047] Specifically, the magnetic member has at least two opposite magnetic poles, the number of the position sensors 40 is two, the two position sensors 40 are installed at intervals along the circumferential direction of the output shaft 11, and the two position sensors 40 are used to induce the two opposite magnetic poles of the magnetic member, respectively.

[0048] The magnetic member may be formed by connecting two magnets having different magnetic poles, or by dividing and magnetizing the same magnet to form two different magnetic poles, but this is not limited thereto as long as the magnetic member has two opposite magnetic poles. Two position sensors 40 are attached to the position feedback member 30, respectively, corresponding to two preset positions, and the position feedback member 30 can be detected by the corresponding position sensor 40 at any one of the preset positions, so that the circuit board 50 can control the output shaft 11 to rotate back and forth between the two preset positions of the position feedback member 30.

[0049] It should be noted that since the position sensor 40 is located on the side facing the notch of the mounting groove 22, the mounting base 20 may be made of copper or other metal materials that affect magnetic induction, without affecting the detection process of the position sensor 40.

[0050] In the technical solution of the motor assembly of the electric toothbrush 400 according to the present invention, the position feedback member 30 is fixedly mounted on the output shaft 11 via the mounting seat 20, thereby improving the mounting stability of the position feedback member 30, thereby improving the detection effect of the position sensor 40 on the position feedback member 30 and improving the control effect on the brush head assembly 300.

[0051] The present invention further provides a brush handle assembly 200 for an electric toothbrush 400, which includes a brush handle case, a battery, and a motor assembly for the electric toothbrush 400. The specific structure of the motor assembly for the electric toothbrush 400 refers to the above embodiments. The brush handle assembly 200 for the electric toothbrush 400 employs all the technical solutions of all the above embodiments, and therefore has at least all the beneficial effects of the technical solutions of the above embodiments, so further description will be omitted. Here, the battery is electrically connected to the motor assembly, and both the battery and the motor assembly are mounted within the brush handle case, with the output shaft 11 of the motor assembly extending beyond the brush handle case.

[0052] The present invention further provides an electric toothbrush 400, which includes a brush head assembly 300 and a brush handle assembly 200 of the electric toothbrush 400. The specific structure of the brush handle assembly 200 of the electric toothbrush 400 refers to the above embodiments. The electric toothbrush 400 employs all the technical solutions of all the above embodiments, and therefore has at least all the beneficial effects of the technical solutions of the above embodiments, so further description will be omitted here. Here, the brush head assembly 300 is detachably connected to the output shaft 11 of the motor assembly.

[0053] Finally, it should be noted that the above embodiments are only used to explain the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art can still understand that the technical solutions described in the above embodiments may be modified or some of the technical features may be replaced with equivalents, and such modifications or replacements will not deviate from the essence of the corresponding technical solutions and the spirit and scope of the technical solutions of the embodiments of the present application. [Explanation of symbols]

[0054] 10 Motor body 11 Output shaft 12 Motor housing 13 Bearings 14 Bottom lid 20 Mounting seat 21 Connection hole 22 Mounting groove 23 Inner wall 24 Outer wall 25 Bottom Wall 26 Stopper part 30 Position feedback member 40 Position Sensor 50 Circuit Board 60 Connection Shell 111 Output terminal 112 Feedback end 121 Positioning groove 141 Support groove 142 Positioning protrusion 143 Wiring notch 200 Brush Handle Assembly 300 Brush Head Assembly 400 Electric Toothbrush

Claims

1. 1. A motor assembly for an electric toothbrush, comprising: a motor body provided with an output shaft; a mounting seat having a connection hole formed therein, the mounting seat being fixed to the output shaft via the connection hole so as to rotate together with the output shaft, and the mounting seat having a mounting groove formed on a circumferential side of the connection hole; a position feedback member mounted in the mounting groove so as to rotate together with the output shaft; a position sensor that is spaced apart from the mounting seat and positioned on the side where the notch of the mounting groove faces, for detecting a movement position of the position feedback member; the mounting groove extends annularly around the outer periphery of the connection hole, and the position feedback member is disposed annularly so as to be adapted to be mounted in the mounting groove; the mounting seat includes an inner peripheral wall, an outer peripheral wall, and a bottom wall connecting the inner peripheral wall and the outer peripheral wall, the inner peripheral wall, the outer peripheral wall, and the bottom wall jointly surrounding the mounting groove, and the inner peripheral wall surrounding the connecting hole.

2. 2. The motor assembly of claim 1, wherein the end of the inner circumferential wall adjacent to the position sensor protrudes from the end of the position feedback member remote from the bottom wall.

3. 2. The motor assembly for an electric toothbrush according to claim 1, wherein an end of the position feedback member remote from the bottom wall protrudes from an end of the outer peripheral wall adjacent to the position sensor.

4. 4. The motor assembly of an electric toothbrush according to claim 1, wherein the output shaft has an output end and a feedback end, the output end is used to connect to a brush handle assembly of the electric toothbrush, and the mounting seat is fitted to the feedback end.

5. 5. The motor assembly of claim 4, wherein the notch of the mounting groove is spaced apart from the output end.

6. 6. The motor assembly of claim 5, wherein the motor assembly further includes a circuit board, the circuit board being attached to one side of the feedback end in the longitudinal direction of the output shaft, and the position sensor being attached to the circuit board.

7. the motor body includes a motor housing, the output shaft is rotatably attached to the motor housing, the output end and the feedback end extend from opposite ends of the motor housing, respectively; The motor assembly further includes a connecting shell, the connecting shell being connected to a side of the motor housing close to the feedback end and being surrounded by the feedback end, and the circuit board being capped and attached to an end of the connecting shell away from the motor housing.

7. The motor assembly of claim 6.

8. 8. The motor assembly for an electric toothbrush according to claim 7, wherein the motor body further includes a bearing, the bearing is attached to an end of the motor housing close to the feedback end, the output shaft is fixedly fitted to an inner ring of the bearing, and a stopper portion is protruded on the side of the mounting seat facing away from the mounting groove, the stopper portion being arranged along the circumferential direction of the connecting hole and abutting against the inner ring of the bearing.

9. the motor body further includes a bottom cover, the bottom cover being interposed between the connecting shell and the inner cavity of the motor housing, the feedback end penetrating the bottom cover, a support groove being provided on a side of the bottom cover away from the mounting seat, and the bearing being mounted in the support groove; The motor assembly for an electric toothbrush according to claim 8, characterized in that a positioning protrusion is protruding from the peripheral wall of the bottom cover, a positioning groove is provided in the end wall of the motor housing, the positioning protrusion is positioned and fitted into the positioning groove, and / or a wiring notch is provided in the peripheral wall of the bottom cover for passing conductors between the circuit board and the motor body.

10. 2. The motor assembly of claim 1, wherein the mounting seat is configured as a copper member, and / or the position feedback member is configured as a magnetic member, and the position sensor is configured as a Hall sensor.

11. the magnetic member has at least two opposite magnetic poles, the number of the position sensors is two, the two position sensors are installed at intervals along the circumferential direction of the output shaft, and the two position sensors are used to induce the two opposite magnetic poles of the magnetic member, respectively; 11. The electric toothbrush motor assembly of claim 10.

12. 12. A brush handle assembly for an electric toothbrush, comprising: a brush handle case; a battery; and an electric toothbrush motor assembly according to any one of claims 1, 2, 3, 10, and 11, wherein the battery is electrically connected to the motor assembly, the battery and the motor assembly are both mounted within the brush handle case, and an output shaft of the motor assembly extends beyond the brush handle case.

13. 13. An electric toothbrush comprising: a brush head assembly; and a brush handle assembly of the electric toothbrush of claim 12, wherein the brush head assembly is removably connected to an output shaft of the motor assembly.

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