Motor assembly of electric toothbrush, brush handle device and electric toothbrush

Abstract

The embodiment of the present application discloses a motor assembly, a handle device and an electric toothbrush of an electric toothbrush, wherein the motor assembly of the electric toothbrush includes a motor body and a circuit board module, the motor body includes a stator assembly and a rotor assembly, the rotor assembly includes an output shaft that can rotate relative to the stator assembly around a preset axis; the circuit board module includes a flexible circuit board and a hard support plate, the hard support plate is fixed relative to the stator assembly and is located at the bottom end of the output shaft, the flexible circuit board includes a lateral extension section and a connecting section that are connected to each other, the lateral extension section is fixed to the hard support plate, and a sensor for detecting the motion parameters of the rotor assembly is provided on the lateral extension section. The motor assembly of the electric toothbrush of the utility model makes the installation of the flexible circuit board more stable and reliable.

Description

Technical Field

[0001] The present application relates to the technical field of electric toothbrushes, and in particular to a motor assembly, a brush handle device and an electric toothbrush. Background Art

[0002] Electric toothbrushes are widely used due to their good cleaning effect and ease of use. In the related art, electric toothbrushes are designed so that the brush head can rotate greatly to simulate the large swinging of human hands to brush teeth and improve the cleaning effect. A motor assembly is provided in the brush handle device, and a circuit board is provided at the bottom of the motor assembly for detecting the motion parameters of the output shaft. Due to the limited internal space of the electric toothbrush, the circuit board at the bottom of the motor assembly is designed as a flexible circuit board in the related art to facilitate bending and connection. Since the motor vibrates when working, the connection between the flexible circuit board and the motor housing is unstable, which in turn affects the detection accuracy.

[0003] The above contents are only used to assist in understanding the technical solutions of the utility model and do not constitute an admission that the above contents are prior art. Utility Model Content

[0004] In view of the above problems, the utility model proposes a motor assembly for an electric toothbrush, aiming to solve the technical problem that the unstable connection between the flexible circuit board and the motor housing affects the detection accuracy.

[0005] To achieve the above-mentioned purpose, the motor assembly of the electric toothbrush proposed by the utility model includes a motor body and a circuit board module; wherein,

[0006] A motor body, the motor body comprising a stator assembly and a rotor assembly, the rotor assembly comprising an output shaft rotatable relative to the stator assembly around a preset axis; and

[0007] A circuit board module, wherein the circuit board module includes a flexible circuit board and a hard support plate, wherein the hard support plate is fixed relative to the stator assembly and is located at the bottom end of the output shaft, wherein the flexible circuit board includes a lateral extension section and a connecting section connected to each other, wherein the lateral extension section is fixed to the hard support plate, and wherein a sensor for detecting motion parameters of the rotor assembly is provided on the lateral extension section.

[0008] In one embodiment, the motor body further includes a motor housing, the stator assembly is fixedly connected in the motor housing, and the hard support plate is detachably connected to the bottom end of the motor housing.

[0009] In one embodiment, the transverse extension section is attached to the upper surface of the rigid support plate, and the lower surface of the rigid support plate is provided with a plurality of welding points, and the welding points penetrate the rigid support plate and contact the flexible circuit board.

[0010] In one embodiment, a first screw hole is formed on the flexible circuit board, a second screw hole is formed on the hard support plate corresponding to the first screw hole, and the motor assembly of the electric toothbrush also includes a screw, which passes through the first screw hole and the second screw hole and is connected to the motor housing.

[0011] In one embodiment, a first positioning hole is formed on the flexible circuit board, a second positioning hole is formed on the hard support plate corresponding to the first positioning hole, and a positioning column adapted to be plugged into the first positioning hole and the second positioning hole is provided on the motor housing.

[0012] In one embodiment, the hard support plate and the transverse extension section are configured in a conformal manner, and motor wiring gaps are correspondingly provided on the outer peripheral walls of the hard support plate and the transverse extension section, and the motor wiring gaps are configured to avoid the plurality of welding points.

[0013] In one embodiment, a transition cut surface is provided on the outer peripheral wall of the rigid support plate corresponding to the connection between the transverse extension section and the connecting section, and the connecting section can be bent from the transition cut surface to fit the plate surface of the rigid support plate away from the transverse extension section.

[0014] In one embodiment, the hard support plates are provided in plurality, and the plurality of hard support plates are stacked in the axial direction of the output shaft, and the transverse extension section is attached to the upper plate surface of the hard support plate at the top.

[0015] In one embodiment, the motor assembly of the electric toothbrush further includes a position feedback component, which is fixedly connected to the rotor assembly; the sensor is arranged corresponding to the position feedback component to detect the rotational position of the output shaft.

[0016] In one embodiment, the position feedback member includes a magnetic ring coaxially arranged with the output shaft, the sensor includes two Hall sensors, and the transverse extension section is arranged below the magnetic ring at intervals; the two Hall sensors are fixed at intervals on the upper surface of the transverse extension section.

[0017] The utility model also proposes a brush handle device, comprising a brush handle shell, a main control board and the motor assembly of the electric toothbrush described in any of the above embodiments, wherein the main control board and the motor assembly are installed in the brush handle shell, and the upper end of the output shaft of the motor assembly extends out of the brush handle shell; the connecting section of the flexible circuit board of the motor assembly is electrically connected to the main control board.

[0018] In one embodiment, the brush handle device also includes a power supply component installed in the brush handle shell, the power supply component is arranged below the brush handle shell, the hard support plate of the motor component is arranged between the motor body of the motor component and the power supply component, and a via is opened on the main control board, and the connecting section is electrically connected to the control element on the main control board via the via.

[0019] The utility model further provides an electric toothbrush, comprising a brush head assembly and a brush handle device as described in any one of the above embodiments, wherein the output shaft of the brush handle device is connected to the brush head assembly.

[0020] The motor assembly of the electric toothbrush of the utility model is such that the circuit board module includes a flexible circuit board and a hard support plate, and the sensor is installed on the lateral extension section of the flexible circuit board fixed to the hard support plate. In this way, the circuit board module is a combination of soft and hard structures. Since the hard support plate has a high structural strength, it can provide better support for the flexible circuit board. The flexible circuit board is fixed to the motor body through the hard support plate, which can improve the connection stability of the flexible circuit board and prevent the flexible circuit board from causing the sensor thereon to shake, thereby affecting the detection accuracy. At the same time, since the hard support plate has a flat support plane, the lateral extension section of the flexible circuit board is fitted and fixed to the hard support plate, which can make the installation of the sensor fixed on the lateral extension section more stable and reliable, and can further ensure the detection accuracy of the motor. In addition, the circuit board module of the motor assembly is a structure in which the flexible circuit board is fitted on the hard support plate. Compared with the method of connecting two hard circuit boards through a flexible circuit board, it effectively reduces costs while ensuring the function. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A cross-sectional view of an embodiment of a motor assembly of an electric toothbrush of the utility model is shown;

[0023] Figure 2 A partial cross-sectional view of the motor assembly of the electric toothbrush of the utility model from another angle;

[0024] Figure 3 This is a schematic structural diagram of an embodiment of a circuit board module of the utility model;

[0025] Figure 4 for Figure 3 Schematic diagram of the exploded structure of the circuit board module;

[0026] Figure 5 for Figure 4 A schematic diagram of the structure of the circuit board module from another angle;

[0027] Figure 6 This is a structural schematic diagram of an embodiment of the brush handle device of the utility model;

[0028] Figure 7 for Figure 6 A cross-sectional view of the middle brush handle device at one angle;

[0029] Figure 8 for Figure 7 A partial enlarged view of part A in the middle.

[0030] Description of Figure Numbers:

[0031]

[0032] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B.

[0036] The utility model provides a motor component of an electric toothbrush.

[0037] In the embodiment of the present utility model, please refer to Figures 1 to 5 The motor assembly 100 of the electric toothbrush includes a motor body 110 and a circuit board module 130; wherein the motor body 110 includes a stator assembly 111 and a rotor assembly 112, and the rotor assembly 112 includes an output shaft 113 that can rotate around a preset axis relative to the stator assembly 111; the circuit board module 130 includes a flexible circuit board 140 and a hard support plate 150, the hard support plate 150 is fixed relative to the stator assembly 111, the flexible circuit board 140 includes a lateral extension section 141 and a connecting section 142 that are connected to each other, the lateral extension section 141 is fixed to the hard support plate 150, and a sensor 122 for detecting the motion parameters of the rotor assembly 112 is provided on the lateral extension section 141.

[0038] In this embodiment, the structures of the stator assembly 111 and the rotor assembly 112 can refer to existing designs and are not specifically limited here. For example, the stator assembly 111 includes silicon steel sheets and coil windings arranged in a ring shape; the rotor assembly 112 includes a rotor core disposed inside the silicon steel sheets, and the output shaft 113 is disposed in the middle of the rotor core. After the coil winding is energized, a magnetic field is generated with the silicon steel sheets, and the rotor core drives the output shaft 113 to rotate around its axis under the action of the magnetic field. The output shaft 113 is used to connect to the brush head assembly of the electric toothbrush to drive the brush head assembly to rotate.

[0039] There can be many types of sensors 122, for example, they can be position sensors (Hall sensors). The sensor 122 is mounted on a hard support plate 150 and fixed relative to the stator assembly 111. The hard support plate 150 can be connected to the motor housing 114 or to the stator assembly 111. The hard support plate 150 provides support and structural reinforcement for the flexible circuit board 140. The thickness of the hard support plate 150 can be selected and designed according to actual needs, and is not specifically limited here. The flexible circuit board 140 is used to power the sensor 122. The lateral extension section 141 of the flexible circuit board 140 extends in the lateral direction. The lateral extension section 141 can be fixedly attached to the board surface of the hard support plate 150 by pressing, welding, etc., and the connecting section 142 is used to be electrically connected to the main control board 300 of the electric toothbrush. The motor assembly 100 is connected to the main control board 300 through the connecting section 142 of the flexible circuit board 140, so that the circuit board can be bent to adapt to the complex spatial layout in the electric toothbrush.

[0040] The motor assembly 100 of the electric toothbrush of the utility model is such that the circuit board module 130 includes a flexible circuit board 140 and a hard support plate 150, and the sensor 122 is installed on the lateral extension section 141 of the flexible circuit board 140 fixed to the hard support plate 150. In this way, the circuit board module 130 is a soft-hard structure. Since the hard support plate 150 has a high structural strength, it can provide better support for the flexible circuit board 140. The flexible circuit board 140 is fixed on the motor body 110 through the hard support plate 150, which can improve the connection stability of the flexible circuit board 140 and prevent the flexible circuit board 140 from causing the sensor 122 thereon to shake, thereby affecting the detection accuracy. At the same time, since the hard support plate 150 has a flat support plane, the lateral extension section 141 of the flexible circuit board 140 is fitted and fixed to the hard support plate 150, which can make the installation of the sensor 122 fixed on the lateral extension section 141 more stable and reliable, and can further ensure the motor detection accuracy. In addition, the circuit board module 130 of the motor assembly 100 is a structure in which a flexible circuit board 140 is attached to a hard support plate 150. Compared with the method of connecting two hard circuit boards through a flexible circuit board 140, it effectively reduces costs while ensuring functionality.

[0041] Further, the motor body 110 also includes a motor housing 114, the stator assembly 111 is fixedly connected to the motor housing 114, and the hard support plate 150 is detachably connected to the bottom end of the motor housing 114. Specifically, the hard support plate 150 and the plate surface of the lateral extension section 141 extend in the lateral direction, and the plate surface is perpendicular to the output shaft 113. The hard support plate 150 can be detachably connected to the motor housing 114 by means of screws 170, clamping, embedding, etc. By making the hard support plate 150 detachably connected to the motor housing 114, it is more convenient to disassemble and assemble the circuit board module 130 and the motor body 110, thereby facilitating the maintenance of the circuit board module 130. The motor housing 114 can specifically include a main housing and an end shell detachably connected to the lower end of the main housing, the stator assembly 111 and the rotor assembly 112 are arranged in the main housing, the lower end of the output shaft 113 can be rotatably mounted on the end shell, and the hard support plate 150 is detachably connected to the end shell.

[0042] In one embodiment, the transverse extension section 141 is attached to the upper surface of the rigid support plate 150 , and the lower surface of the rigid support plate 150 is provided with a plurality of welding points, which penetrate the rigid support plate 150 and contact the flexible circuit board 140 .

[0043] In this embodiment, the lateral extension section 141 can be specifically fixed to the upper plate surface of the rigid support plate 150 by pressing. It can be understood that the rigid support plate 150 is an insulating material used as a rigid support substrate. By setting a plurality of welding points on the rigid support lower plate surface for welding the rigid support plate 150 and the flexible circuit board 140, the plurality of welding points on the lower plate surface of the rigid support plate 150 can be used for welding with the motor wires, that is, transferring the welding points on the flexible circuit board 140 to the rigid support plate 150 can simplify the circuit of the flexible circuit board 140 and improve the reliability of the entire circuit board module 130.

[0044] In one embodiment, if Figures 2 to 5 As shown, a first screw hole 143 is opened on the flexible circuit board 140, and a second screw hole 151 is opened on the hard support plate 150 corresponding to the first screw hole 143. The motor assembly 100 of the electric toothbrush also includes a screw 170, which passes through the first screw hole 143 and the second screw hole 151 and is connected to the motor housing 114.

[0045] In this embodiment, the number of the first screw hole 143 and the second screw hole 151 can be selected and designed according to actual needs. In order to ensure the installation stability of the circuit board module 130, optionally, two first screw holes 143 and second screw holes 151 are provided, and they are symmetrically arranged in the axial direction of the output shaft 113. The screw 170 passes through the screw 170 holes of the flexible circuit board 140 and the hard support plate 150 and is connected to the motor housing 114, which can ensure the connection stability among the flexible circuit board 140, the hard support plate 150 and the motor housing 114.

[0046] In one embodiment, please refer again to Figures 2 to 5 The flexible circuit board 140 is provided with a first positioning hole 144 , the hard support plate 150 is provided with a second positioning hole 152 corresponding to the first positioning hole 144 , and the motor housing 114 is provided with a positioning column 115 adapted to be plugged into the first positioning hole 144 and the second positioning hole 152 .

[0047] In this embodiment, the number of the first positioning hole 144 and the second positioning hole 152 can be selected and designed according to actual needs. In order to ensure the installation stability of the circuit board module 130, optionally, two first positioning holes 144 and two second positioning holes 152 are provided, and they are symmetrically arranged in the axial direction of the output shaft 113. Through the cooperation of the positioning column 115 with the positioning holes on the hard support plate 150 and the flexible circuit board 140, the pre-positioning assembly of the circuit board module 130 on the motor housing 114 can be realized, which is more conducive to the accurate assembly of the circuit board module 130 and the motor housing 114.

[0048] In one embodiment, a plurality of hard support plates 150 are provided, and the plurality of hard support plates 150 are stacked in the axial direction of the output shaft 113 , and the transverse extension section 141 is attached to the upper plate surface of the hard support plate 150 at the top.

[0049] In this embodiment, it can be understood that the circuit board module 130 is arranged below the output shaft 113, and the position feedback member 121, such as a magnetic ring that provides feedback for the Hall sensor on the flexible circuit board 140, is fixed at the bottom end of the output shaft 113. Therefore, the lateral extension section 141 of the flexible circuit board 140 is attached to the upper surface of the hard support board 150 at the top, so that the sensor on the flexible circuit board 140 can directly correspond to the position feedback member 121, thereby ensuring the position detection accuracy.

[0050] The number of hard support plates 150 can be selected and designed according to the vibration strength of the motor body 110, and is not specifically limited here. For example, the hard support plates 150 can be set to two or three. Multiple hard support plates 150 can be fixed by screws, or by pressing, bonding, etc. In other embodiments, the structural strength of the circuit board module 130 can also be enhanced by thickening a single hard support plate 150. In this embodiment, by stacking multiple hard support plates 150, the connection stability of the entire circuit board module 130 can be further improved, the shaking of the sensor 122 set on the flexible circuit board 140 can be effectively avoided, and the detection accuracy of the rotation position of the output shaft 113 can be further improved. Compared with the method of thickening a single hard support plate 150, stacking multiple hard support plates 150 can effectively reduce costs.

[0051] In one embodiment, if Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the motor assembly of the electric toothbrush further includes a position feedback member 121 , and the position feedback member 121 is fixedly connected to the rotor assembly 112 ; the sensor 122 is arranged corresponding to the position feedback member 121 to detect the rotation position of the output shaft 113 .

[0052] In this embodiment, the sensor 122 may be a Hall sensor, a laser sensor, an inductive sensor, etc. The position feedback member 121 is used to feedback position information to the sensor 122 to play a role in positioning. The position feedback member 121 is fixedly connected to the rotor assembly 112. The position feedback member 121 may be fixedly connected to the output shaft 113 or to the rotor core. It only needs to be able to rotate synchronously with the output shaft 113 to feedback the rotation position of the output shaft 113.

[0053] When the motor is working, the position feedback member 121 rotates with the output shaft 113. When the position feedback member 121 rotates to correspond to the sensor 122, the rotation of the rotor assembly 112 is restricted, and then the output shaft 113 rotates in the opposite direction. In this way, the large reciprocating rotation of the output shaft 113 can be controlled. Since the motor vibrates when working, the connection between the flexible circuit board 140 and the motor housing 114 is unstable, so that the position sensor 122 on the flexible circuit board 140 will shake, which will affect the position detection accuracy of the output shaft 113. The present application strengthens and stabilizes the installation of the flexible circuit board 140 through the hard support plate 150, which can effectively prevent the flexible circuit board 140 from shaking the position sensor 122 thereon due to the vibration of the motor, thereby improving the position detection accuracy of the output shaft.

[0054] Furthermore, the position feedback member 121 includes a magnetic ring coaxially arranged with the output shaft 113 , the sensor 122 includes two Hall sensors, and the transverse extension section 141 is arranged below the magnetic ring at intervals; the two Hall sensors are fixed at intervals on the upper surface of the transverse extension section 141 .

[0055] In this embodiment, the magnetic ring can be fixedly mounted on the output shaft 113 by means of a bracket, a sleeve and other structures, so as to rotate synchronously with the output shaft 113. The Hall sensor can be fixed to the upper surface of the transverse extension section 141 by means of welding, bonding and the like. By setting two spaced Hall sensors on the upper surface of the transverse extension section 141, after the output shaft 113 rotates to one of the Hall sensors corresponding to the magnetic ring, the Hall limit switch is triggered to control the output shaft 113 to rotate in the opposite direction, and after the output shaft 113 rotates in the opposite direction to the other Hall sensor corresponding to the magnetic ring, the output shaft 113 is controlled to rotate in the opposite direction again, thereby controlling the reciprocating rotation of the output shaft 113, and the reciprocating rotation angle of the output shaft 113 can be adjusted by setting the interval position of the two Hall sensors.

[0056] In one embodiment, please refer to Figures 3 to 5 The hard support plate 150 and the transverse extension section 141 are arranged in a conformal manner, and the outer peripheral walls of the hard support plate 150 and the transverse extension section 141 are correspondingly provided with a motor cable notch 160, and the motor cable notch 160 is arranged to avoid multiple welding points. The motor cable notch 160 can be specifically U-shaped. The motor cable notch 160 is used to pass the motor wire through, and plays a role in positioning the motor wire. The motor cable notch 160 avoids multiple welding points, and the position of the motor cable notch 160 can be determined according to the arrangement of multiple welding points.

[0057] In one embodiment, if Figure 1 , Figures 3 to 5 , Figure 8As shown, a transition cut surface 153 is provided at the connection between the lateral extension section 141 and the connecting section 142 on the peripheral wall of the rigid support plate 150, and the connecting section 142 can be bent by the transition cut surface 153 to fit the plate surface of the rigid support plate 150 away from the lateral extension section 141. The peripheral wall of the rigid support plate 150 is provided with the transition cut surface 153, which makes it easier for the connecting section 142 to be bent to fit the plate surface of the rigid support plate 150 away from the lateral extension section 141, so as to ensure the smooth fit between the connecting piece and the rigid support plate 150 after being bent.

[0058] The utility model also provides a brush handle device 10, please refer to Figure 7 and Figure 8 The brush handle device 10 includes a brush handle housing 200, a main control board 300 and a motor assembly 100 of an electric toothbrush. The specific structure of the motor assembly 100 of the electric toothbrush refers to the above embodiment. The main control board 300 and the motor assembly 100 are installed in the brush handle housing 200, and the upper end of the output shaft 113 of the motor assembly 100 extends out of the brush handle housing 200; the connecting section 142 of the flexible circuit board 140 of the motor assembly 100 is electrically connected to the main control board 300; since the brush handle device 10 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0059] In one embodiment, if Figure 7 and Figure 8 As shown, the brush handle device 10 also includes a power supply component 400 installed in the brush handle shell 200, the power supply component 400 is arranged below the brush handle shell 200, the hard support plate 150 of the motor component 100 is arranged between the motor body 110 of the motor component 100 and the power supply component 400, a through hole is opened on the main control board 300, and the connecting section 142 is electrically connected to the control element on the main control board 300 via the through hole.

[0060] In this embodiment, the brush handle housing 200 is extended in a strip shape along the axial direction of the output shaft 113. The hard support plate 150 of the motor assembly 100 is arranged between the power supply assembly 400 and the motor body 110, and the interval between the power supply assembly 400 and the motor body 110 is fully utilized. By opening a via hole on the main control board 300, the connecting section 142 of the flexible circuit board 140 can be connected to the control board through the via hole, which can ensure the compactness of the layout of the whole machine.

[0061] The utility model also proposes an electric toothbrush, which includes a brush head assembly and a brush handle device 10. The specific structure of the brush handle device 10 refers to the above embodiment. Since the electric toothbrush adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. The specific structure of the brush head assembly can refer to the existing design, which will not be described here. In order to facilitate the replacement of the brush head assembly, the brush head assembly is usually detachably connected to the output shaft 113, and the specific connection method can refer to the existing design.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A motor assembly for an electric toothbrush, characterized in that: include: A motor body, the motor body comprising a stator assembly and a rotor assembly, the rotor assembly comprising an output shaft rotatable around a preset axis relative to the stator assembly; as well as A circuit board module, wherein the circuit board module includes a flexible circuit board and a hard support plate, wherein the hard support plate is fixed relative to the stator assembly and is located at the bottom end of the output shaft, wherein the flexible circuit board includes a lateral extension section and a connecting section connected to each other, wherein the lateral extension section is fixed to the hard support plate, and wherein a sensor for detecting motion parameters of the rotor assembly is provided on the lateral extension section.

2. The motor assembly of the electric toothbrush according to claim 1, characterized in that: The motor body also includes a motor housing, the stator assembly is fixedly connected in the motor housing, and the hard support plate is detachably connected to the bottom end of the motor housing.

3. The motor assembly of the electric toothbrush according to claim 2, characterized in that: The transverse extension section is attached to the upper surface of the rigid support plate, and the lower surface of the rigid support plate is provided with a plurality of welding points, which penetrate the rigid support plate and contact the flexible circuit board.

4. The motor assembly of the electric toothbrush according to claim 2, characterized in that: The flexible circuit board is provided with a first screw hole, the hard support plate is provided with a second screw hole corresponding to the first screw hole, and the motor assembly of the electric toothbrush also includes a screw, which passes through the first screw hole and the second screw hole and is connected to the motor housing.

5. The motor assembly of the electric toothbrush according to claim 4, characterized in that: The flexible circuit board is provided with a first positioning hole, the hard support plate is provided with a second positioning hole corresponding to the first positioning hole, and the motor housing is provided with a positioning column adapted to be plugged with the first positioning hole and the second positioning hole.

6. The motor assembly of the electric toothbrush according to claim 3, characterized in that: The hard support plate and the transverse extension section are arranged in a conformal manner, and motor wiring notches are correspondingly provided on the outer peripheral walls of the hard support plate and the transverse extension section, and the motor wiring notches are arranged to avoid the plurality of welding points.

7. The motor assembly of the electric toothbrush according to claim 1, characterized in that: The outer peripheral wall of the rigid support plate is provided with a transition cut surface corresponding to the connection between the transverse extension section and the connecting section, and the connecting section can be bent from the transition cut surface to fit the plate surface of the rigid support plate away from the transverse extension section.

8. The motor assembly of an electric toothbrush according to any one of claims 1 to 7, characterized in that: The hard support plates are provided in plurality, and the plurality of hard support plates are stacked in the axial direction of the output shaft, and the transverse extension section is attached to the upper plate surface of the hard support plate at the top.

9. The motor assembly of an electric toothbrush according to any one of claims 1 to 7, characterized in that: The motor assembly of the electric toothbrush further comprises a position feedback component, which is fixedly connected to the rotor assembly; the sensor is arranged corresponding to the position feedback component to detect the rotation position of the output shaft.

10. The motor assembly of the electric toothbrush according to claim 9, characterized in that: The position feedback member comprises a magnetic ring coaxially arranged with the output shaft, the sensor comprises two Hall sensors, the transverse extension section is arranged below the magnetic ring at intervals; the two Hall sensors are fixed at intervals on the upper surface of the transverse extension section.

11. A brush handle device, characterized in that: An electric toothbrush comprising a handle shell, a main control board and a motor assembly as claimed in any one of claims 1 to 10, wherein the main control board and the motor assembly are installed in the handle shell, and the upper end of the output shaft of the motor assembly extends out of the handle shell; the connecting section of the flexible circuit board of the motor assembly is electrically connected to the main control board.

12. The brush handle device according to claim 11, characterized in that: The brush handle device also includes a power supply component installed in the brush handle shell, the power supply component is arranged below the brush handle shell, the hard support plate of the motor component is arranged between the motor body of the motor component and the power supply component, the main control board is provided with a via hole, and the connecting section is electrically connected to the control element on the main control board via the via hole.

13. An electric toothbrush, characterized in that: It comprises a brush head assembly and a brush handle device as claimed in claim 11 or 12, wherein the output shaft of the brush handle device is connected to the brush head assembly.

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