Motor and electric toothbrush

Abstract

The utility model discloses a motor and an electric toothbrush, the motor comprises a casing assembly, a stator assembly, a rotor assembly and at least one limiting piece, the stator assembly is fixedly arranged in the casing assembly, the rotor assembly is rotatably arranged in the stator assembly, at least one end of the rotor assembly is provided with the limiting piece, and the limiting piece is located in the casing assembly. The limiting part is used for abutting against the stator assembly so as to limit the rotation angle of the rotor assembly, and therefore the rotor assembly can conduct reciprocating rotation around the axis of the rotor assembly within the preset rotation angle range. According to the motor and the electric toothbrush provided by the embodiment of the invention, the cleaning effect, the cleaning efficiency and the use comfort of the electric toothbrush can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of oral cleaning appliances, and particularly to a motor and an electric toothbrush. Background Art

[0002] With the improvement of people's living standards, there is more and more attention paid to oral health care, and electric toothbrushes are increasingly entering family life. The electric toothbrushes on the market are mainly vibration-type electric toothbrushes, which mainly generate high-frequency vibrations of the brush head through the vibration of a sonic motor, instantly decomposing toothpaste into fine foam to clean teeth.

[0003] However, the sonic motors in related technologies can only achieve simple vibrations and cannot achieve complex sweeping and vibrating motions. As a result, the brush head can only achieve simple vibrations and cannot achieve complex sweeping and vibrating motions. That is, during brushing, the brush head cannot move up and down while vibrating, so that it is impossible to achieve a brushing method with a large range of motion when simulating the correct manual brushing method, resulting in poor cleaning effect, brushing efficiency, and use comfort during brushing. Utility Model Content

[0004] Embodiments of the present application disclose a motor and an electric toothbrush, which can improve the cleaning effect, cleaning efficiency, and use comfort of the electric toothbrush.

[0005] To achieve the above object, in a first aspect, the present application discloses a motor, which includes:

[0006] A housing assembly;

[0007] A stator assembly, which is fixedly arranged inside the housing assembly;

[0008] A rotor assembly, which is rotatably arranged inside the stator assembly; and

[0009] At least one limiting member, at least one end of the rotor assembly is provided with the limiting member, the limiting member is located inside the housing assembly, and the limiting member is used to abut against the stator assembly to limit the rotation angle of the rotor assembly, so that the rotor assembly rotates reciprocally around the axis of the rotor assembly within a preset rotation angle range.

[0010] In the motor provided by this application, a limiting member is provided at at least one end of the rotor assembly, and the limiting member is abutted against the stator assembly to limit the rotation angle of the rotor assembly, so that the rotor assembly reciprocally rotates around the axis of the rotor assembly within a preset angle range. At the same time, the rotor assembly will also generate vibration during its high-speed rotation. Furthermore, the rotor assembly can swing circumferentially and vibrate axially. When the rotor assembly is used to connect to a brush head, the reciprocating rotation of the rotor assembly around the axis of the rotor assembly within the preset angle range can drive the brush head to perform a reciprocating swinging motion, thereby simulating the swinging angle of manual brushing, realizing the vertical brushing action of the brush head, efficiently brushing the tooth surface, the tooth neck, and the interdental area, and improving the tooth dirt removal force in fine parts such as the tooth surface, the tooth neck, and the interdental area. At the same time, the vibration generated by the rotor assembly during high-speed rotation can drive the brush head to vibrate, enabling the electric toothbrush to not only achieve a large-amplitude swinging of the brush head but also superimpose high-frequency vibration, combining the two brushing modes of simulating manual brushing and high-frequency electric brushing. In this way, the cleaning effect and cleaning efficiency of the electric toothbrush can be improved, and the comfort of using the electric toothbrush is also ensured.

[0011] As an optional implementation manner, in the embodiment of the first aspect of this application, the rotation angle of the rotor assembly is not less than -30°, and / or, the rotation angle of the rotor assembly is not greater than 30°. That is to say, the maximum rotation angle of the rotor assembly that can rotate clockwise is 30°, and the maximum rotation angle counterclockwise is also 30°.

[0012] When the rotation angle of the rotor assembly is less than -30° or greater than 30°, the rotation stroke of the rotor assembly is too large, and the swinging amplitude of the brush head connected to the rotor assembly is relatively large. Not only is it easy to brush parts outside the teeth, such as the palate, bringing an uncomfortable experience to the user, but it also increases the time of the brush head, resulting in low brushing efficiency. Moreover, the movement trajectories of the ends of the bristles are not in the same plane, that is, the contact time between the bristles and the tooth surface during swinging is limited, affecting the cleaning effect. Therefore, controlling the rotation angle of the rotor assembly within the above range in this application can enable the toothbrush to brush as many tooth surfaces of the entire tooth as possible to increase the cleaning effect while shortening the rotation stroke of the rotor assembly and improving the cleaning efficiency.

[0013] As an alternative embodiment, in the embodiment of the first aspect of the present application, the rotor assembly includes a rotating shaft, a rotor core, a permanent magnet, and a permanent magnet sleeve. At least one end of the rotating shaft extends outside the housing assembly. The rotor core is sleeved on the outer periphery of the rotating shaft. The permanent magnet is disposed in the rotor core, and the rotor core extends along the axial direction of the rotating shaft. The permanent magnet sleeve covers the outer peripheries of the rotor core and the permanent magnet. In this way, the permanent magnet can be reinforced and protected by the permanent magnet sleeve, which can not only ensure that the permanent magnet will not fall off during normal use, but also because the permanent magnet sleeve covers the outer periphery of the permanent magnet, the permanent magnet sleeve can effectively protect the permanent magnet under extreme dropping conditions.

[0014] As an alternative embodiment, in the embodiment of the first aspect of the present application, the stator assembly includes a stator core, a winding support fixedly connected to the inner surface of the stator core, and a coil wound around the winding support. The stator core is fixedly connected to the inner surface of the housing assembly. The rotor assembly is rotatably disposed inside the stator core. The limiting member abuts against the stator core and / or the winding support. By winding the coil around the winding support of the stator assembly, compared with winding the coil around the rotor assembly, it can avoid the situation that the coil is knotted or worn due to the large swing of the rotor assembly, which is beneficial to improving the service life of the coil and ensuring the normal operation of the motor to guarantee the use performance of the motor.

[0015] As an alternative embodiment, in the embodiment of the first aspect of the present application, the winding support has a support portion located outside the stator core. The support portion is provided with a limiting groove. The limiting groove has two opposite side walls opposite to each other in the circumferential direction of the stator core. A limiting protrusion located between the two opposite side walls protrudes from the outer peripheral surface of the limiting member. In the circumferential direction of the stator core, the width of the limiting protrusion is smaller than the distance between the two opposite side walls, and the limiting protrusion is used to abut against each of the opposite side walls to limit the rotation angle of the rotor assembly. With the above design, the limiting groove can be formed by removing part of the material on the winding support. The two opposite side walls of the limiting groove cooperate with the limiting protrusion of the limiting member. In this way, there is no need to additionally add components to cooperate with the limiting member, which simplifies the structure of the motor, so the miniaturized design of the motor can be realized. At the same time, since the limiting structure on the stator core is formed by removing part of the material on the winding support to form the limiting groove, the weight of the winding support is reduced, so the lightweight design of the motor can be realized.

[0016] As an alternative implementation, in the embodiment of the first aspect of the present application, there are two limiting grooves, and the two limiting grooves are arranged at intervals along the circumference of the stator core. There are two limiting protrusions, and the two limiting protrusions are arranged at intervals along the circumference of the stator core, and each limiting protrusion is located between the two opposite side walls of one of the limiting grooves. In this way, it can play a dual limiting role in the rotation angle range of the rotor assembly, and the limiting effect is better, so as to facilitate accurately controlling the rotation angle range of the rotor assembly. At the same time, the rotation angle range of the rotor assembly can also be adjusted as needed by adjusting the distance between the two limiting protrusions along the circumference of the bracket part, so as to facilitate obtaining different ranges of swing angles.

[0017] As an alternative implementation, in the embodiment of the first aspect of the present application, the cross-section obtained by intercepting the bracket part by the first plane is a rectangular cross-section. Among them, the first plane is configured as a plane perpendicular to the axial direction of the stator core. The rectangular cross-section has alternately connected long sides and short sides, and the limiting grooves are formed on the long sides. That is, by arranging the limiting grooves on the relatively long side walls of the bracket part, there is enough space to set relatively large limiting grooves, so that the distance between the two opposite side walls in the circumferential direction of the wiring bracket is relatively large, so that the rotor assembly can have a relatively large rotation angle range and realize large-angle swing.

[0018] As an alternative implementation, in the embodiment of the first aspect of the present application, the wiring bracket has a bracket part located outside the stator core, and the bracket part is provided with a wire passing groove penetrating along its radial direction, and the wire passing groove is used for the coil to pass through. In this way, the wire passing groove can play a certain limiting role on the coil, avoiding the coil from detaching from the wiring bracket and winding together, thereby avoiding affecting the coil and playing a certain protective role on the coil.

[0019] As an alternative implementation, in the embodiment of the first aspect of the present application, the stator core includes a stator cylinder part and a plug-in part. The stator cylinder part is fixedly connected to the inner surface of the housing assembly, and the plug-in part is fixedly connected to the inner surface of the stator cylinder part. A part of the wiring bracket is arranged inside the stator cylinder part, and the wiring bracket is provided with a plug-in groove penetrating along its radial direction, and the plug-in groove is located inside the stator cylinder part to be plugged with the plug-in part, so as to realize the connection and fixation of the stator core and the wiring bracket.

[0020] In the present application, the stator core and the winding support are connected and fixed through the cooperation and insertion of the insertion part and the insertion slot, that is, the stator core and the winding support are fixed by means of insertion, so as to facilitate the connection between the two. In addition, since the stator cylinder part and the support cylinder part are both integral cylindrical structures, compared with the method of respectively using two split structures to butt-join to form the stator cylinder part and the support cylinder part, the assembly process of the stator assembly can be simplified, and the assembly of the stator assembly is convenient.

[0021] As an optional implementation manner, in the embodiment of the first aspect of the present application, ports are provided at two opposite ends of the stator cylinder part in its axial direction. The winding support includes two opposite wire dividing supports, and the two wire dividing supports respectively abut against the two ports of the stator core at its two opposite ends in the axial direction, and a part of each wire dividing support is arranged inside the stator cylinder part. Each wire dividing support includes a support cylinder part and a winding part fixedly connected to the inner surface of the support cylinder part. Each wire dividing support is provided with the insertion slot that penetrates through the support cylinder part and the winding part in the radial direction, and the insertion slot penetrates through the support cylinder part and one end surface of the winding part located inside the stator cylinder part along the axial direction of the wire dividing support. The insertion slot is located inside the stator cylinder part to be inserted into the insertion part, the coil is wound around the outer periphery of each winding part, the rotor assembly is rotatably arranged inside the stator cylinder part, and the limiting part abuts against the support cylinder part and / or the winding part.

[0022] By adopting the form of two wire dividing supports for the winding support, when actually installing the stator core and the winding support, the two wire dividing supports can be respectively inserted into the stator cylinder part from the two ports of the stator cylinder part. In this process, the insertion part can be inserted into the insertion slot from the opening of the insertion slot in the axial direction of the wire dividing support, so as to facilitate the insertion of the insertion part into the insertion slot, thereby facilitating the assembly between the stator core and the winding support.

[0023] As an optional implementation manner, in the embodiment of the first aspect of the present application, each wire dividing support further includes a stopping part, the stopping part is arranged at one end of the winding part away from the support cylinder part, and the stopping part extends along the circumferential direction of the support cylinder part; the insertion slot also penetrates through the stopping part in the radial direction of the wire dividing support; the insertion part includes a radially extending part and a circumferentially extending part. One end of the radially extending part is connected to the inner surface of the stator cylinder part, and the radially extending part is inserted into the insertion slot, the circumferentially extending part is connected to the end of the radially extending part away from the stator cylinder part, and the circumferentially extending part is located outside the insertion slot and abuts against the stopping part to limit the separation between the insertion part and the insertion slot in the radial direction of the support cylinder part, thereby being beneficial to further improving the connection reliability between the stator core and the wire dividing support.

[0024] As an alternative embodiment, in the embodiment of the first aspect of the present application, the limiting member is made of a non-magnetic material, so that while ensuring the limiting effect, it can avoid the situation that the movement of the rotor assembly is out of control due to the magnetization of the limiting member, which affects the use.

[0025] As an alternative embodiment, in the embodiment of the first aspect of the present application, the housing assembly has opposite first and second ends. The first end is provided with an opening, and the second end is provided with a through hole. One end of the rotor assembly extends out of the through hole to be located outside the housing assembly, and the other end of the rotor assembly is located in the opening; there is one limiting member, and the limiting member is inserted through the other end of the rotor assembly.

[0026] Considering that the through hole at the second end needs to allow one end of the rotor assembly to pass through so that one end of the rotor assembly is located outside the housing cylinder part, unlike the opening at the first end which is usually sealed by an end cover, the sealing between one end of the rotor assembly and the through hole is more difficult. Inserting the limiting member through the other end of the rotor assembly instead of through one end of the rotor assembly can avoid affecting the sealing between one end of the rotor assembly and the through hole and reduce the sealing difficulty between one end of the rotor assembly and the through hole; at the same time, since the diameter of the opening is usually larger than the diameter of the through hole, it is easier to assemble the limiting member to the other end of the rotor assembly from the opening, which is beneficial to the assembly of the limiting member and also beneficial to the automatic assembly of the limiting member.

[0027] As an alternative embodiment, in the embodiment of the first aspect of the present application, the housing assembly includes a housing cylinder part and an end cover. The housing cylinder part has opposite first and second ends. The first end is provided with an opening, and the second end is provided with a through hole. The end cover covers the first end of the cylinder to block the opening. The stator assembly is fixedly arranged inside the housing cylinder part. One end of the rotor assembly extends out of the through hole to be located outside the housing cylinder part, and the other end of the rotor assembly is rotatably connected to the end cover. By setting the housing assembly in the form of a combination of a housing cylinder part and an end cover, when actually installing the stator assembly and the rotor assembly, the stator assembly can be inserted into the housing cylinder part from the opening first, then the rotor assembly is placed, and one end of the rotor assembly extends out of the through hole of the housing cylinder part. Finally, the end cover blocks the opening at the first end of the housing cylinder part, thereby preventing the stator assembly, the rotor assembly, etc. from falling out of the inside of the housing cylinder part. That is to say, in this embodiment, through the design of the opening, it is convenient to install the stator assembly, the rotor assembly, etc. into the inside of the housing cylinder part from the opening.

[0028] As an alternative embodiment, in the embodiment of the first aspect of the present application, two wire-winding protrusions are convexly provided on the surface of the end cap facing away from the casing cylinder, and two wire-passing holes penetrating axially through the end cap are provided on the end cap. The stator assembly includes a coil. One end of the coil passes out of one of the wire-passing holes to the outside of the casing assembly and is wound around one of the wire-winding protrusions. The other end of the coil passes out of the other wire-passing hole to the outside of the casing assembly and is wound around the other wire-winding protrusion. Through the above design, while the two ends of the coil can be led out of the casing assembly to facilitate the electrical connection of the coil with the control board and / or power supply of the electric toothbrush, not only can the two ends of the coil be fixed by the wire-winding protrusions, but also the automated soldering can be conveniently realized, achieving the mass automated production of the product.

[0029] In a second aspect, the present application discloses an electric toothbrush, which includes a casing, a mounting bracket, a brush head, and the motor as described in the first aspect above. The mounting bracket is installed inside the casing. The motor is located inside the casing and is installed on the mounting bracket, and a part of the rotor assembly of the motor extends out of the outside of the casing and is connected to the brush head. Since the electric toothbrush has the motor described in the first aspect above, the electric toothbrush has the beneficial effects of the motor described in the first aspect above, that is, the electric toothbrush also improves the cleaning effect, cleaning efficiency, and use comfort of the electric toothbrush.

[0030] Compared with the prior art, the beneficial effects of the present application are as follows:

[0031] The motor and the electric toothbrush provided by the embodiments of the present application are provided with a limiting member at at least one end of the rotor assembly to use the limiting member to abut against the stator assembly to limit the rotation angle of the rotor assembly, so that the rotor assembly reciprocally rotates around the axis of the rotor assembly within a preset angle range. At the same time, the rotor assembly will also generate vibration when it rotates at a high speed. Furthermore, the rotor assembly can swing circumferentially and vibrate axially. When the rotor assembly is used to connect with the brush head, the reciprocating rotation of the rotor assembly around the axis of the rotor assembly within a preset angle range can drive the brush head to make a reciprocating swinging motion, so that the swinging angle of manual brushing can be simulated, and the vertical brushing action of the brush head can be realized, and the tooth surface, tooth neck, and interdental area can be efficiently brushed, improving the removal force of dental plaque in fine parts such as the tooth surface, tooth neck, and interdental area; at the same time, the vibration generated by the rotor assembly when rotating at a high speed can drive the brush head to vibrate, so that the electric toothbrush can not only achieve a large-amplitude swinging of the brush head, but also superimpose high-frequency vibration, combining the two brushing modes of simulating manual brushing and high-frequency electric brushing. In this way, the cleaning effect and cleaning efficiency of the electric toothbrush can be improved, and the use comfort of the electric toothbrush is also ensured. Description of the Drawings

[0032] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0033] Figure 1 is a schematic structural diagram of an electric toothbrush disclosed in an embodiment of the present application;

[0034] Figure 2 is a schematic structural diagram of a motor disclosed in an embodiment of the present application;

[0035] Figure 3 is an exploded structural diagram of the motor disclosed in an embodiment of the present application;

[0036] Figure 4 is an exploded structural diagram of the motor from another perspective disclosed in an embodiment of the present application;

[0037] Figure 5 is a front view of the motor disclosed in an embodiment of the present application;

[0038] Figure 6 is a cross-sectional view of the motor along Figure 5 M-M in

[0039] Figure 7 is a cross-sectional view of the end cap along Figure 5 M-M in

[0040] Figure 8 is a cross-sectional view of the motor along Figure 5 N-N in

[0041] Figure 9 is a structural diagram of the motor from another perspective disclosed in an embodiment of the present application;

[0042] Figure 10 is a schematic structural diagram of a stator assembly disclosed in an embodiment of the present application;

[0043] Figure 11 is an exploded structural diagram of the stator assembly disclosed in an embodiment of the present application;

[0044] Figure 12 is a schematic structural diagram of a rotor assembly disclosed in an embodiment of the present application;

[0045] Figure 13 is an exploded structural diagram of the rotor assembly disclosed in an embodiment of the present application.

[0046] Main reference numeral description

[0047] 100 - Electric toothbrush;

[0048] 10 - Motor; 11 - Housing assembly; 111 - Housing cylinder part; 111a - First end; 111a1 - Open end; 111b - Second end; 111b1 - Through hole; 112 - End cover; 1121 - Mounting groove; 1121a - Mounting section; 1121b - Avoidance section; 1121c - Stop step; 1122 - Winding protrusion; 1123 - Wire passing hole; 12 - Stator assembly; 121 - Coil; 122 - Stator core; 1221 - Stator cylinder part; 1221a - Port; 1222 - Insertion part; 1222a - Radial extension part; 1222b - Circumferential extension part; 123 - Winding bracket; 123a - Wire dividing bracket; 1231 - Bracket cylinder part; 1231a - First bracket part; 1232 - Winding part; 1232a - Second bracket part; 1233 - Insertion slot; 1234 - Limiting slot; 1234a - Opposite side walls; 1235 - Wire passing groove; 1236 - Stop part; 13 - Rotor assembly; 131 - Magnet; 132 - Rotating shaft; 133 - Rotor core; 1331 - Receiving groove; 134 - Magnet sleeve; 14 - Limiting part; 141 - Limiting protrusion; 15 - First bearing; 16 - Second bearing;

[0049] 20 - Outer shell;

[0050] 30 - Brush head. Detailed implementation manners

[0051] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the description of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0053] It can be understood that the terms "first", "second", etc. used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the present application, the first bearing can be called the second bearing, and similarly, the second bearing can be called the first bearing. Both the first bearing and the second bearing are bearings, but they are not the same bearing.

[0054] It can be understood that for the "connection" in the following embodiments, if there is transmission of electrical signals or data between the connected circuits, modules, units, etc., it should be understood as "electrical connection", "communication connection", etc.

[0055] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the related listed items.

[0056] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of an electric toothbrush provided by an embodiment of the present application. Figure 2 is a schematic structural diagram of a motor provided by an embodiment of the present application. The electric toothbrush 100 provided by the embodiment of the present application can be used to clean the user's oral cavity, especially to clean the user's teeth. Among them, the electric toothbrush 100 may include a motor 10, a housing 20, a mounting bracket (not shown), and a brush head 30.

[0057] The housing 20 in the present application mainly serves as the appearance component of the electric toothbrush 100 and is used to be held by the user so as to facilitate the user to use the electric toothbrush 100. The housing 20 is used to install the mounting bracket, the motor 10, etc., to protect components such as the mounting bracket and the motor 10. Specifically, the mounting bracket is arranged inside the housing 20, and the mounting bracket is used to support components such as the motor 10 located inside the housing 20. The mounting bracket is fixedly connected to the housing 20 so that the components such as the motor mounted on the mounting bracket are relatively fixed in position with respect to the housing 20.

[0058] The motor 10 in the present application mainly serves as the power component of the electric toothbrush 100. The motor 10 is arranged inside the housing 20 and on the mounting bracket, and a part of the motor extends from the inside of the housing to the outside of the housing 20 to be connected to the brush head 30. That is, the brush head 30 is connected to the end of the motor 10 that extends outside the housing 20. Thus, during the operation of the electric toothbrush 100, the motor 10 can be used to drive the brush head 30 to move, such as high-frequency vibration and reciprocating swing, and then the brush head 30 that vibrates and swings reciprocally at high frequency is used to clean the user's oral cavity.

[0059] Please refer to Figure 2 and Figure 3, the motor 10 provided in the embodiment of the present application may include a housing assembly 11, a stator assembly 12, a rotor assembly 13, and at least one limiting member 14. The stator assembly 12 is fixedly arranged in the housing assembly 11, the rotor assembly 13 is rotatably arranged in the stator assembly 12, and a part of the rotor assembly 13 extends out of the housing and is connected to the brush head. The limiting member is located in the housing assembly. The rotor assembly 13 is provided with a limiting member 14 at at least one end, so that the limiting member 14 can rotate relative to the stator assembly 12 together with the rotor assembly 13, so that the limiting member 14 can be used to abut against the stator assembly 12 to limit the rotation angle of the rotor assembly 13, and further enable the rotor assembly 13 to rotate reciprocally around the axis of the rotor assembly 13 within a preset rotation angle range, and then drive the brush head to perform a reciprocating swinging motion, which can simulate the swinging angle of manual brushing, so that the electric toothbrush can simulate the human hand to clean teeth by the Bass brushing method, realizing the vertical brushing action of the brush head, and can efficiently brush the tooth surface, the tooth neck and the interdental area, increasing the cleaning effect and cleaning efficiency of the electric toothbrush; at the same time, the rotor assembly 13 will also generate vibration under its high-speed rotation to drive the brush head to vibrate, realizing vibration brushing. Wherein, the preset rotation angle range is also the rotation angle range of the rotor assembly 13.

[0060] It can be seen that the electric toothbrush in the present application can not only achieve a large-amplitude swinging of the brush head, simulate the human hand to clean teeth by the Bass brushing method, but also superimpose high-frequency vibration. In this way, the two brushing modes of simulating manual brushing and high-frequency electric brushing can be combined, improving the cleaning effect and cleaning efficiency of the electric toothbrush, and at the same time ensuring the use comfort of the electric toothbrush. In addition, the swinging motion characteristics of the brush head conform to human brushing habits, and can cover a wider tooth surface without changing the user's holding posture, expanding the cleaning range, further increasing the cleaning effect and cleaning efficiency of the tooth surface, and at the same time further improving the use comfort of the electric toothbrush.

[0061] In some alternative embodiments, the rotation angle of the rotor assembly 13 is not less than -30°, and / or the rotation angle of the rotor assembly 13 is not greater than 30°. For example, the rotation angle of the rotor assembly 13 is -30°, -25°, -20°, -15°, -10°, -5°, 5°, 10°, 15°, 20°, 25° or 30°, etc. That is to say, the maximum rotation angle of the rotor assembly 13 in the clockwise direction is 30°, and the maximum rotation angle in the counterclockwise direction is also 30°. When the rotation angle of the rotor assembly 13 is less than -30° or greater than 30°, the rotation stroke of the rotor assembly 13 is too large, and the swing amplitude of the brush head is relatively large. Not only is it easy to brush parts outside the teeth, such as the palate, bringing an uncomfortable experience to the user, but it also increases the time of the brush head, resulting in low brushing efficiency. Moreover, the movement trajectories of the ends of the bristles are not in a plane, that is, the contact time between the bristles and the tooth surface during swinging is limited, affecting the cleaning effect. Therefore, in this application, controlling the rotation angle of the rotor assembly 13 within the above range can enable the toothbrush to brush as many tooth surfaces of the entire tooth as possible to increase the cleaning effect, while shortening the rotation stroke of the rotor assembly 13 and improving the cleaning efficiency.

[0062] Optionally, the material of the limiting member 14 is a non-magnetic material, such as stainless steel, ceramic, glass, plastic, silicone or rubber, etc. In this way, while ensuring the limiting effect, it can avoid the situation that the movement of the rotor assembly 13 is out of control due to the magnetization of the limiting member 14, which affects the use.

[0063] In this application, at least one end of the rotor assembly 13 is provided with a limiting member 14, which can be understood as: only one end of the rotor assembly 13 is provided with a limiting member 14, and in this case, the limiting member 14 is one; or, both ends of the rotor assembly 13 are provided with limiting members 14, and in this case, there are two limiting members 14. Hereinafter, taking the case where one end of the rotor assembly 13 is provided with a limiting member 14, that is, there is one limiting member, as an example, the specific structure of the motor 10 in this application will be further described in detail.

[0064] In some alternative embodiments, in combination with Figures 3 to 6As shown in the figure, in order to facilitate the assembly of the stator assembly 12, the rotor assembly 13, etc. to the housing assembly 11, the housing assembly 11 includes a housing cylindrical portion 111 and an end cover 112. The housing cylindrical portion 111 has a first end 111a and a second end 111b which are oppositely arranged. An opening 111a1 is provided at the first end 111a, and a through hole 111b1 is provided at the second end 111b. The end cover 112 is covered on the first end 111a of the cylinder to block the opening 111a1. The stator assembly 12 is fixedly arranged inside the housing cylindrical portion 111. One end of the rotor assembly 13 extends out of the through hole 111b1 to the outside of the housing cylindrical portion 111, and the other end of the rotor assembly 13 is rotatably connected to the end cover 112. By setting the housing assembly in the form of a combination of the housing cylindrical portion 111 and the end cover 112, when actually installing the stator assembly 12 and the rotor assembly 13, the stator assembly 12 can be inserted into the housing cylindrical portion 111 from the opening 111a1 of the housing cylindrical portion 111 first, and then the rotor assembly 13 is placed in. One end of the rotor assembly 13 extends out of the housing cylindrical portion 111 from the through hole 111b1. Finally, the end cover 112 blocks the opening 111a1 of the first end 111a of the housing cylindrical portion 111, thereby preventing the stator assembly 12, the rotor assembly 13, etc. from falling out of the inside of the housing cylindrical portion 111. That is to say, in this embodiment, through the design of the opening 111a1, it is convenient to install the stator assembly 12, the rotor assembly 13, etc. from the opening 111a1 into the inside of the housing cylindrical portion 111.

[0065] Optionally, the limiting member 14 is inserted through the other end of the rotor assembly 13. Considering that the through hole 111b1 at the second end 111b needs to allow one end of the rotor assembly 13 to pass through so that one end of the rotor assembly 13 is located outside the housing cylindrical portion 111, unlike the opening 111a1 at the first end 111a which has the end cover 112 for sealing, the sealing between one end of the rotor assembly 13 and the through hole 111b1 is more difficult. Inserting the limiting member 14 through the other end of the rotor assembly 13 instead of through one end of the rotor assembly 13 can avoid affecting the sealing between one end of the rotor assembly 13 and the through hole 111b1 and reduce the sealing difficulty between one end of the rotor assembly 13 and the through hole 111b1. At the same time, since the diameter of the opening 111a1 is usually larger than the diameter of the through hole 111b1, it is easier to assemble the limiting member 14 to the other end of the rotor assembly 13 from the opening 111a1, which is beneficial to the assembly of the limiting member 14 and also beneficial to the automatic assembly of the limiting member 14.

[0066] In some alternative embodiments, the motor 10 in the present application further includes a first bearing 15 disposed between the outer peripheral surface of the rotor assembly 13 and the wall surface of the through hole 111b1, and / or the motor 10 in the present application further includes a second bearing 16, and the other end of the rotor assembly 13 is rotatably connected to the end cover 112 through the second bearing 16. That is to say, in the implementation design, the first bearing 15 can be disposed between the outer peripheral surface of the rotor assembly 13 and the wall surface of the through hole 111b1, the second bearing 16 can be disposed between the other end of the rotor assembly 13 and the end cover 112, or the first bearing 15 can be disposed between the outer peripheral surface of the rotor assembly 13 and the wall surface of the through hole 111b1 while the second bearing 16 is disposed between the other end of the rotor assembly 13 and the end cover 112. Preferably, the first bearing 15 is disposed between the outer peripheral surface of the rotor assembly 13 and the wall surface of the through hole 111b1 while the second bearing 16 is disposed between the other end of the rotor assembly 13 and the end cover 112. In this way, one end of the rotor assembly 13 can be supported by the first bearing 15, and the other end of the rotor assembly 13 can be supported by the second bearing 16, reducing the friction coefficient of the rotor assembly 13 during movement, improving the rotational stability of the rotor assembly 13, and ensuring the rotational accuracy of the rotor assembly 13.

[0067] In some alternative embodiments, as Figure 6 and Figure 7 shown, an installation groove 1121 is provided on the side of the end cover 112 close to the housing cylinder part 111. The installation groove 1121 includes an installation section 1121a and an avoidance section 1121b that are axially connected to each other in the rotor assembly 13. The installation section 1121a is closer to the housing cylinder part 111 than the avoidance section 1121b, and the radial dimension of the installation section 1121a is larger than the radial dimension of the avoidance section 1121b to form a stop step 1121c. The first bearing 15 is installed in the installation section 1121a and abuts against the stop step 1121c, and the avoidance section 1121b is used to avoid the end of the rotor assembly 13 extending out of the first bearing 15. During actual installation, the first bearing 15 is disposed in the installation section 1121a. After installation, the stop step 1121c can stop and limit the first bearing 15. The end of the rotor assembly 13 passes through the first bearing 15 and is located in the avoidance section 1121b, thereby preventing the rotor assembly 13 from colliding with the end cover 112, avoiding noise generation during the operation of the motor 10, and improving the service life of the rotor assembly 13 and the motor 10.

[0068] In addition, by providing the installation groove 1121 on the end cover 112 and then disposing the first bearing 15 in the installation groove 1121, that is, installing the first bearing 15 on the end cover 112, it is more suitable for the assembler to install the first bearing 15.

[0069] Exemplarily, the end cover 112 and the housing cylinder part 111 in this embodiment can be connected together by means of threaded connection, screw connection, bolt connection, snap connection, bonding or welding.

[0070] Optionally, the first bearing 15 and / or the second bearing 16 can be a sliding bearing, a rolling bearing or a deep groove ball bearing, etc. That is to say, in the implementation design, the first bearing 15 can be set as one of a sliding bearing, a rolling bearing or a deep groove ball bearing, the second bearing 16 can be set as one of a sliding bearing, a rolling bearing or a deep groove ball bearing, or both the first bearing 15 and the second bearing 16 can be set as one of a sliding bearing, a rolling bearing or a deep groove ball bearing at the same time.

[0071] In the present application, the rotation of the rotor assembly 13 relative to the stator assembly 12 can be achieved by using the magnetic field effect. For example, the area of the stator assembly 12 corresponding to the rotor assembly 13 is used to generate a first magnetic field, and the rotor assembly 13 is used to generate a second magnetic field coupled with the first magnetic field, so that the rotor assembly 13 can rotate relative to the stator assembly 12. It should be noted that the rotation of the rotor assembly 13 relative to the stator assembly 12 can also be achieved by other means, and the embodiments of the present application do not limit this.

[0072] In an exemplary embodiment, please refer to Figure 8 and Figure 9 , the stator assembly 12 can include a coil 121 for generating a first magnetic field when energized, and the rotor assembly 13 can include a magnet 131 for generating a second magnetic field. Thus, when changing the direction and magnitude of the energizing current of the coil 121, the first magnetic field can be changed, and the interaction between the changed first magnetic field and the second magnetic field can achieve the movement of the rotor assembly 13 relative to the stator assembly 12. In another exemplary solution, the stator assembly 12 can include a magnet 131 for generating a first magnetic field, and the rotor assembly 13 includes a coil 121 for generating a second magnetic field when energized. Thus, when changing the direction and magnitude of the energizing current of the coil 121, the second magnetic field can be changed, and the interaction between the changed second magnetic field and the first magnetic field can also achieve the movement of the rotor assembly 13 relative to the stator assembly 12.

[0073] In some alternative embodiments, two wire winding protrusions 1122 protrude from the surface of the end cap 112 facing away from the casing cylinder, and the end cap 112 is provided with two wire passing holes 1123 penetrating axially therethrough. One end of the coil 121 passes out of one of the wire passing holes 1123 to the outside of the casing assembly 11 and is wound around one of the wire winding protrusions 1122, and the other end of the coil 121 passes out of the other wire passing hole 1123 to the outside of the casing assembly 11 and is wound around the other wire winding protrusion 1122. In this way, while leading the two ends of the coil 121 out of the outer casing assembly to facilitate the electrical connection of the coil 121 with the control board and / or power supply of the electric toothbrush, not only can the two ends of the coil 121 be fixed by the wire winding protrusions 1122, but also automated soldering can be conveniently achieved, realizing the mass automated production of the product.

[0074] Next, taking the stator assembly 12 including the coil 121 and the rotor assembly 13 including the magnet 131 as an example, the specific structures of the stator assembly 12 and the rotor assembly 13 of the present application will be further described in detail.

[0075] Please refer to Figures 9 to 11 , the stator assembly 12 in the present application may further include a stator core 122 fixedly connected to the inner surface of the casing assembly 11 and a wire winding bracket 123 fixedly connected to the inner surface of the stator core 122. The coil 121 is wound around the wire winding bracket 123, so that the coil 121 can be insulated from the stator core 122 through the wire winding bracket 123 to avoid electric leakage. When assembling the stator assembly 12, the wire winding brackets 123 for insulation can be first installed at both ends of the stator core 122, and then the coil 121 is wound around the wire winding bracket 123, thus forming the stator assembly 12. By winding the coil 121 around the wire winding bracket 123 of the stator assembly 12, compared with winding the coil 121 around the rotor assembly 13, the situation that the coil 121 is knotted or worn due to the large swing of the rotor assembly 13 can be avoided, which is beneficial to improving the service life of the coil 121 and ensuring the normal operation of the motor to guarantee the use performance of the motor.

[0076] Please refer to Figures 11 to 13 , the rotor assembly 13 in the present application is rotatably disposed within the stator core 122, and the limiting member 14 abuts against the stator core 122 and / or the wire winding bracket 123. The rotor assembly 13 further includes a rotating shaft 132, a rotor core 133 and a magnet 131. At least one end of the rotating shaft 132 extends out of the casing assembly, and the end of the rotating shaft 132 extending out of the casing assembly is connected to the brush head. The rotor core 133 is sleeved on the outer periphery of the rotating shaft 132, the magnet 131 is disposed on the rotor core 133, and the rotor core 133 extends along the axial direction of the rotating shaft 132.

[0077] When an alternating current is applied to the coil 121 of the given sub-component 12, the coil 121 generates an alternating magnetic field. The stator core 122 conducts magnetism, so that the alternating magnetic field generated by the coil 121 can be further strengthened under the action of the stator core 122, and the stator core 122 is magnetized, and an N pole and an S pole are respectively formed on the opposite sides of the coil 121. The magnetic steel 131 of the rotor assembly 13 swings circumferentially along the rotating shaft 132 under the action of magnetic force according to the principle of like poles repelling and opposite poles attracting, and drives the rotor core 133 and the rotating shaft 132 to swing circumferentially along the rotating shaft 132. Under the influence of the alternating current, the current direction of the coil 121 changes continuously, and the N pole and S pole of the corresponding stator core 122 change continuously, thereby driving the mover assembly to swing back and forth circumferentially along the rotating shaft 132.

[0078] Optionally, the stator core 122 can be arranged in a cylindrical shape, and the cylindrical stator core 122 can be fixed inside the housing assembly by interference fit, or can be fixed inside the housing assembly by means of welding, plugging, clamping, etc.

[0079] In some alternative embodiments, such as Figure 10 and Figure 11 As shown, the stator core 122 can include a stator cylinder part 1221 and a plug-in part 1222. The stator cylinder part 1221 is fixedly connected to the inner surface of the housing assembly, and the plug-in part 1222 is fixedly connected to the inner surface of the stator cylinder part 1221; a part of the winding bracket 123 is arranged inside the stator cylinder part 1221, and the winding bracket 123 is provided with a plug-in groove 1233 penetrating radially along it. The plug-in groove 1233 is located inside the stator cylinder part 1221 to be plugged with the plug-in part 1222, that is, the plug-in part 1222 is plugged into the plug-in groove 1233, so as to realize the connection and fixation of the stator core 122 and the winding bracket 123.

[0080] In the present application, the connection and fixation between the stator core 122 and the winding bracket 123 are realized through the mating plugging of the plug-in part 1222 and the plug-in groove 1233, that is, the stator core 122 and the winding bracket 123 are fixed by plugging, so as to facilitate the connection between the two. In addition, since both the stator cylinder part 1221 and the bracket cylinder part 1231 are integral cylindrical structures, compared with the method of respectively adopting two split structures to butt-join to form the stator cylinder part 1221 and the bracket cylinder part 1231, the assembly process of the stator assembly 12 can be simplified, and the assembly of the stator assembly 12 is convenient.

[0081] Optionally, ports 1221a are provided at opposite ends of the stator cylinder portion 1221 in its axial direction. The winding support 123 may include two opposite wire-dividing supports 123a. The two wire-dividing supports 123a respectively abut against opposite ends of the stator core 122 at the ports 1221a in its axial direction, and a part of each wire-dividing support 123a is disposed within the stator cylinder portion 1221. Each wire-dividing support 123a includes a support cylinder portion 1231 and a winding portion 1232 fixedly connected to the inner surface of the support cylinder portion 1231. Each wire-dividing support 123a is provided with an insertion slot 1233 that penetrates through the support cylinder portion 1231 and the winding portion 1232 in its radial direction, and the insertion slot 1233 penetrates through one end surface of the support cylinder portion 1231 and the winding portion 1232 located within the stator cylinder portion 1221 along the axial direction of the wire-dividing support 123a, that is, the insertion slot 1233 is located within the stator cylinder portion 1221 to be inserted into the insertion portion 1222. The coil 121 is wound around the outer periphery of each winding portion 1232. The rotor assembly 13 is rotatably disposed within the stator cylinder portion 1221, and the limiting member 14 abuts against the support cylinder portion 1231 and / or the winding portion 1232.

[0082] By adopting the form of two wire-dividing supports 123a for the winding support 123, when actually installing the stator core 122 and the winding support 123, the two wire-dividing supports 123a can be respectively inserted into the stator cylinder portion 1221 from the two ports 1221a at both ends of the stator cylinder portion 1221. During this process, the insertion portion 1222 can be inserted into the insertion slot 1233 from the opening of the insertion slot 1233 in the axial direction of the wire-dividing support 123a, so as to facilitate inserting the insertion portion 1222 into the insertion slot 1233, thereby facilitating the assembly between the stator core 122 and the winding support 123.

[0083] In the present application, as Figure 11 and Figure 12 shown, the winding support 123 has a support portion located outside the stator core 122, and the support portion is provided with a limiting slot 1234. For example, the support cylinder portion 1231 has a first support portion 1231a located outside the stator cylinder portion 1221, and / or the winding portion 1232 has a second support portion 1232a located outside the stator cylinder portion 1221. The first support portion 1231a and / or the second support portion 1232a are provided with the limiting slot 1234, that is, in the present application, the first support portion 1231a and / or the second support portion 1232a constitute the support portion.

[0084] Further, the limiting groove 1234 has two opposite side walls 1234a that are circumferentially opposite to each other along the stator core 122. A limiting protrusion 141 located between the two opposite side walls 1234a is convexly provided on the outer peripheral surface of the limiting member 14. Along the circumferential direction of the stator core 122, the width of the limiting protrusion 141 is smaller than the distance between the two opposite side walls 1234a, and the limiting protrusion 141 is used to abut against each opposite side wall 1234a to limit the rotation angle of the rotor assembly 13. That is, when the rotor assembly 13 rotates clockwise until it abuts against one of the opposite side walls 1234a, the rotor assembly 13 cannot continue to rotate clockwise at this time, but needs to change the rotation direction of the rotor assembly 13, that is, the rotor assembly 13 can rotate counterclockwise, and when it rotates until it abuts against the other opposite side wall 1234a, the rotor assembly 13 cannot continue to rotate counterclockwise, and so on. Thus, the rotor assembly 13 reciprocally rotates around the axis of the rotor assembly 13 within a preset rotation angle range, and further drives the brush head to perform a reciprocating swinging motion, which can simulate the swinging angle of manual toothbrushing, so that the electric toothbrush can simulate the human hand to clean teeth using the Bass brushing method, realizing the vertical brushing action of the brush head, and can efficiently brush the tooth surface, tooth neck and interdental area, increasing the cleaning effect and cleaning efficiency of the electric toothbrush.

[0085] With the above design, the stator core 122 and the winding bracket 123 can be fixed by means of insertion, which is convenient for the connection between the two. Moreover, by removing part of the material on the winding bracket 123 to form the limiting groove 1234, the two opposite side walls 1234a of the limiting groove 1234 are matched with the limiting protrusion 141 of the limiting member 14. In this way, there is no need to additionally add components to cooperate with the limiting member 14, simplifying the structure of the motor. Therefore, the miniaturized design of the motor can be realized. At the same time, since the limiting structure on the stator core 122 is formed by removing part of the material on the winding bracket 123 to form the limiting groove 1234, the weight of the winding bracket 123 is reduced. Therefore, the lightweight design of the motor 10 can be realized.

[0086] It should be noted that when the first support part 1231a and the second support part 1232a are both provided with the limit grooves 1234, if the limit protrusion 141 only extends between the two opposite side walls 1234a of the limit groove 1234 located on the second support part 1232a and does not extend between the two opposite side walls 1234a of the limit groove 1234 located on the first support part 1231a, then the limit protrusion 141 only abuts against the opposite side walls 1234a of the limit groove 1234 on the second support part 1232a; if the limit protrusion 141 extends between the two opposite side walls 1234a of the limit groove 1234 located on the first support part 1231a, then the projections of the limit groove 1234 on the first support part 1231a and the limit groove 1234 on the second support part 1232a on the extended side wall of the stator cylinder part 1221 at least partially overlap. That is to say, the projections of the limit groove 1234 on the first support part 1231a and the limit groove 1234 on the second support part 1232a on the extended side wall of the stator cylinder part 1221 may completely overlap, may partially overlap and partially not overlap, or one projection may be located within the other projection.

[0087] When the projections of the limit groove 1234 on the first support part 1231a and the limit groove 1234 on the second support part 1232a on the extended side wall of the stator cylinder part 1221 completely overlap, the limit protrusion 141 can simultaneously abut against the opposite side walls 1234a of the limit grooves 1234 on the first support part 1231a and the second support part 1232a.

[0088] When the projections of the limit groove 1234 on the first support part 1231a and the limit groove 1234 on the second support part 1232a on the extended side wall of the stator cylinder part 1221 partially overlap and partially do not overlap, the limit protrusion 141 abuts against the opposite side wall 1234a that is closest to the limit protrusion 141 in the circumferential direction of the wire dividing support 123a.

[0089] When one of the projections of the limiting groove 1234 on the first support part 1231a and the limiting groove 1234 on the second support part 1232a in the projection on the extended side wall of the stator cylinder part 1221 is located within the other projection, specifically when the projection of the limiting groove 1234 on the first support part 1231a on the extended side wall of the stator cylinder part 1221 is located within the projection of the limiting groove 1234 on the second support part 1232a on the extended side wall of the stator cylinder part 1221, the limiting protrusion 141 abuts against the opposite side wall 1234a on the first support part 1231a; when the projection of the limiting groove 1234 on the second support part 1232a on the extended side wall of the stator cylinder part 1221 is located within the projection of the limiting groove 1234 on the first support part 1231a on the extended side wall of the stator cylinder part 1221, the limiting protrusion 141 abuts against the opposite side wall 1234a on the second support part 1232a.

[0090] In some alternative embodiments, the support part may be provided with two limiting grooves 1234 spaced along the circumferential direction of the stator core 122, that is, the first support part 1231a and / or the second support part 1232a may be provided with two limiting grooves 1234 spaced along the circumferential direction of the split wire support 123a. The outer peripheral surface of the limiting member 14 may be convexly provided with two limiting protrusions 141 spaced along the circumferential direction of the stator core 122. Each limiting protrusion 141 is located between two opposite side walls 1234a of a limiting groove 1234. Thus, during the rotation of the rotor assembly 13, each limiting protrusion 141 can be used to abut against one of the opposite side walls 1234a in a limiting groove 1234 to limit the continuous rotation of the rotor assembly 13 in the original direction. In this way, it can not only play a dual limiting role in the rotation angle range of the rotor assembly 13, with a better limiting effect, so as to facilitate the precise control of the rotation angle range of the rotor assembly 13; at the same time, the rotation angle range of the rotor assembly 13 can also be adjusted as needed by adjusting the distance between the two limiting protrusions 141 along the circumferential direction of the split wire support 123a, so as to facilitate the acquisition of different ranges of swing angles.

[0091] In some alternative embodiments, the cross-section of the support part intercepted by the first plane is a rectangular cross-section, that is, the cross-section of the first support part 1231a and / or the second support part 1232a intercepted by the first plane is a rectangular cross-section. This rectangular cross-section has alternately connected long sides and short sides. The limiting groove 1234 is formed on the long side, that is, the limiting groove 1234 is arranged on the relatively long side wall of the first support part 1231a and / or the second support part 1232a. There is enough space to set a relatively large limiting groove 1234, so that the distance between the two opposite side walls 1234a in the circumferential direction of the split wire support 123a is relatively large, so that the rotor assembly 13 can have a relatively large rotation angle range and realize large-angle swing.

[0092] Wherein, the first plane is configured to be perpendicular to the axial direction of the stator core 122.

[0093] In some alternative embodiments, the bracket portion is provided with a wire groove 1235 penetrating therethrough in the radial direction thereof. Specifically, the first bracket portion 1231a is provided with a wire groove 1235 penetrating therethrough in the radial direction thereof. The wire groove 1235 is used for the coil 121 to pass through. In this way, the wire groove 1235 can play a certain limiting role on the coil 121, avoiding the coil 121 from detaching from the winding bracket 123 and getting entangled, thereby avoiding affecting the coil 121 and playing a certain protective role on the coil 121.

[0094] In some alternative embodiments, the wire dividing bracket 123a further includes a stopping portion 1236. The stopping portion 1236 is disposed at one end of the winding portion 1232 away from the bracket barrel portion 1231, and the stopping portion 1236 extends along the circumferential direction of the bracket barrel portion 1231. The insertion slot 1233 also penetrates the stopping portion 1236 in the radial direction of the wire dividing bracket 123a. The insertion portion 1222 on the stator core 122 may include a radially extending portion 1222a and a circumferentially extending portion 1222b. One end of the radially extending portion 1222a is connected to the inner surface of the stator barrel portion 1221, and the radially extending portion 1222a is inserted into the insertion slot 1233. The circumferentially extending portion 1222b is connected to the end of the radially extending portion 1222a away from the stator barrel portion 1221, and the circumferentially extending portion 1222b is located outside the insertion slot 1233 and abuts against the stopping portion 1236 to limit the detachment between the insertion portion 1222 and the insertion slot 1233 in the radial direction of the bracket barrel portion 1231, thereby being beneficial to further improving the connection reliability between the stator core 122 and the wire dividing bracket 123a.

[0095] In some alternative embodiments, as Figure 12 and Figure 13 shown, in order to prevent the magnetic steel 131 from falling off during the swinging process of the rotor assembly 13, the rotor assembly 13 further includes a magnetic steel sleeve 134. The magnetic steel sleeve 134 covers the outer circumferences of the rotor core 133 and the magnetic steel 131. In this way, the magnetic steel 131 can be reinforced and protected by the magnetic steel sleeve 134. Not only can it ensure that the magnetic steel 131 will not fall off during normal use; at the same time, because the magnetic steel sleeve 134 covers the outer circumference of the magnetic steel 131, under extreme dropping conditions, the magnetic steel sleeve 134 can also effectively protect the magnetic steel 131.

[0096] Optionally, the magnetic steel sleeve 134 can be an integral structure extending along the axial direction of the rotating shaft 132, or can include at least two sub-steel sleeves arranged separately. One sub-steel sleeve is located at one end of the rotor core 133, and the other sub-steel sleeve is located at the other end of the rotor core 133.

[0097] In some alternative embodiments, a receiving groove 1331 is formed by concaving the outer peripheral surface of the rotor core 133 for receiving the magnet 131, that is, the magnet 131 is disposed in the receiving groove 1331. In this way, not only can the installation position of the magnet 131 on the rotor core 133 be defined by the receiving groove 1331, and the magnet 131 can be quickly assembled to the designated position on the rotor core 133, improving the assembly rate of the rotor assembly 13; at the same time, the receiving groove 1331 can also play a certain limiting role on the magnet 131, improving the installation stability of the magnet 131 on the rotor core 133 and preventing the magnet 131 from detaching from the rotor core 133.

[0098] Optionally, the rotor assembly 13 may include a plurality of magnets 131 circumferentially spaced apart on the rotor core 133 along the axis 132 to enhance the driving force generated between the rotor assembly 13 and the stator assembly 12, facilitating the smooth rotation of the rotor assembly 13 relative to the stator assembly 12, and the magnet 131 and the inner wall surface of the receiving groove 1331 may be fixedly connected by an adhesive means.

[0099] When assembling the rotor assembly 13 in the present application, first, the rotor core 133 is sleeved on the axis 132, then the magnet 131 is placed into the rotor core 133, and finally, a magnet sleeve 134 is arranged at each end of the rotor core 133 to reinforce and protect the magnet 131 through the magnet sleeve 134. In this way, not only is it ensured that the magnet 131 will not fall off during normal use; at the same time, under extreme dropping conditions, the magnet 131 can also be effectively protected.

[0100] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0101] In addition, the above-described embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the content of this specification should not be construed as a limitation on the present application, and the protection scope of the present application should be subject to the appended claims.

Claims

1. A motor, characterized in that, The motor includes: a housing assembly; a stator assembly fixedly disposed within the housing assembly; a rotor assembly rotatably disposed within the stator assembly; and at least one limiting member provided at at least one end of the rotor assembly, the limiting member being located within the housing assembly and configured to abut against the stator assembly to limit the rotation angle of the rotor assembly, such that the rotor assembly reciprocally rotates about the axis of the rotor assembly within a preset rotation angle range.

2. The motor according to claim 1, characterized in that, The rotation angle of the rotor assembly is not less than -30°, and / or the rotation angle of the rotor assembly is not greater than 30°.

3. The motor according to claim 1, characterized in that, The rotor assembly includes a rotating shaft, a rotor core, a permanent magnet, and a permanent magnet sleeve. At least one end portion of the rotating shaft extends out of the housing assembly. The rotor core is sleeved on the outer periphery of the rotating shaft. The permanent magnet is disposed on the rotor core, and the rotor core extends along the axial direction of the rotating shaft. The permanent magnet sleeve covers the outer peripheries of the rotor core and the permanent magnet.

4. The motor according to claim 1, characterized in that, The stator assembly includes a stator core, a winding bracket fixedly connected to the inner surface of the stator core, and a coil wound around the winding bracket. The stator core is fixedly connected to the inner surface of the housing assembly. The rotor assembly is rotatably disposed within the stator core. The limiting member abuts against the stator core and / or the winding bracket.

5. The motor according to claim 4, characterized in that, The winding bracket has a bracket portion located outside the stator core. The bracket portion is provided with a limiting groove. The limiting groove has two opposite side walls oppositely disposed along the circumferential direction of the stator core. A limiting protrusion is convexly provided on the outer peripheral surface of the limiting member and is located between the two opposite side walls. Along the circumferential direction of the stator core, the width of the limiting protrusion is smaller than the distance between the two opposite side walls, and the limiting protrusion is configured to abut against each of the opposite side walls to limit the rotation angle of the rotor assembly.

6. The motor according to claim 5, characterized in that, There are two limiting grooves, and the two limiting grooves are spaced apart along the circumferential direction of the stator core. There are two limiting protrusions, and the two limiting protrusions are spaced apart along the circumferential direction of the stator core. Each limiting protrusion is located between the two opposite side walls of one of the limiting grooves.

7. The motor according to claim 5, characterized in that, The cross-section of the bracket portion intercepted by a first plane is a rectangular cross-section. The rectangular cross-section has alternately connected long sides and short sides. The limiting groove is formed in the long side; wherein the first plane is configured to be a plane perpendicular to the axial direction of the stator core.

8. The motor according to claim 4, characterized in that, The winding bracket has a bracket portion located outside the stator core. The bracket portion is provided with a wire passing groove penetrating therethrough in the radial direction. The wire passing groove is configured to allow the coil to pass through.

9. The motor according to claim 4, characterized in that, The stator core includes a stator cylinder portion and a plug-in portion. The stator cylinder portion is fixedly connected to the inner surface of the housing assembly. The plug-in portion is fixedly connected to the inner surface of the stator cylinder portion. A part of the winding bracket is disposed within the stator cylinder portion. The winding bracket is provided with a plug-in groove penetrating therethrough in the radial direction. The plug-in groove is located within the stator cylinder portion to be plugged into the plug-in portion.

10. The motor according to claim 9, characterized in that, The stator cylinder part is provided with ports at two opposite ends in its axial direction. The winding support includes two opposite wire dividing supports, and the two wire dividing supports respectively abut against the two ports at the opposite ends of the stator cylinder part in its axial direction. And a part of each wire dividing support is arranged inside the stator cylinder part. Each wire dividing support includes a support cylinder part and a winding part fixedly connected to the inner surface of the support cylinder part. Each wire dividing support is provided with the insertion slot that penetrates through the support cylinder part and the winding part in its radial direction, and the insertion slot penetrates through one end surface of the support cylinder part and the winding part located inside the stator cylinder part along the axial direction of the wire dividing support. The coil is wound around the outer periphery of each winding part. The rotor assembly is rotatably arranged inside the stator cylinder part, and the limiting part abuts against the support cylinder part and / or the winding part.

11. The motor according to claim 10, characterized in that, Each wire dividing support further includes a stopping part, the stopping part is arranged at one end of the winding part away from the support cylinder part, and the stopping part extends along the circumferential direction of the support cylinder part. The insertion slot also penetrates through the stopping part in the radial direction of the wire dividing support; The insertion part includes a radially extending part and a circumferentially extending part. One end of the radially extending part is connected to the inner surface of the stator cylinder part, and the radially extending part is inserted into the insertion slot. The circumferentially extending part is connected to the end of the radially extending part away from the stator cylinder part, and the circumferentially extending part is located outside the insertion slot and abuts against the stopping part.

12. The motor according to claim 1, characterized in that, The material of the limiting part is a non-magnetic material.

13. The motor according to claim 1, characterized in that, The housing assembly has opposite first and second ends. The first end is provided with an opening, and the second end is provided with a through hole. One end of the rotor assembly extends out of the through hole to be located outside the housing assembly, and the other end of the rotor assembly is located in the opening; There is one limiting part, and the limiting part is inserted through the other end of the rotor assembly.

14. The motor according to claim 1, characterized in that, The housing assembly includes a housing cylinder part and an end cover. The housing cylinder part has opposite first and second ends. The first end is provided with an opening, and the second end is provided with a through hole. The end cover covers the first end of the cylinder to seal the opening. The stator assembly is fixedly arranged inside the housing cylinder part. One end of the rotor assembly extends out of the through hole to be located outside the housing cylinder part, and the other end of the rotor assembly is rotatably connected to the end cover.

15. The motor according to claim 14, characterized in that, Two winding protrusions protrude from the surface of the end cover facing away from the housing cylinder, and two wire passing holes penetrating along its axial direction are provided on the end cover. The stator assembly includes a coil. One end of the coil passes out of one of the wire passing holes to be located outside the housing assembly and is wound around one of the winding protrusions. The other end of the coil passes out of the other wire passing hole to be located outside the housing assembly and is wound around the other winding protrusion.

16. An electric toothbrush, characterized in that, The electric toothbrush includes a housing, a mounting bracket, a brush head, and a motor as described in any one of claims 1-15. The mounting bracket is installed inside the housing. The motor is located inside the housing and installed on the mounting bracket. And a part of the rotor assembly of the motor extends outside the housing and is connected to the brush head.

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