Motor and electric toothbrush

Abstract

The utility model discloses a motor and an electric toothbrush, the motor comprises a shell, a stator assembly and a rotor assembly, and an accommodating space is arranged in the shell; the stator assembly comprises a mounting bracket and a magnetic part, the magnetic part is arranged on the mounting bracket, and the mounting bracket is arranged on the inner wall of the accommodating space; the rotor assembly comprises a swing shaft, a rotor iron core and a coil winding, the rotor iron core is arranged on the swing shaft, the coil winding is fixedly installed on the rotor iron core, the rotor iron core is arranged in the installation support, and the coil winding is fixedly installed on the rotor iron core. Therefore, the swing shaft can swing at a large angle through the interaction of the magnetic force generated by the rotor iron core and the magnetic force of the magnetic part, the requirement of tooth brushing action is better met, and the cleaning efficiency and effect of tooth brushing can be improved.

Description

Technical Field

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

[0002] With the improvement of people's living standards, more and more people pay attention to personal cleaning and health. Electric toothbrushes are favored by many users because of their convenient use, labor-saving, and good cleaning power. However, the existing electric toothbrushes can only achieve pure vibration and cannot achieve large-angle swinging motion, making it difficult to meet the development needs of the market. Summary of the Utility Model

[0003] This application provides a motor and an electric toothbrush, which can realize large-angle swinging actions through the interaction between the magnetic force generated by the rotor core and the magnetic part, clean each surface of the teeth, reduce the brushing time while ensuring the tooth cleaning degree, improve the brushing efficiency, and have high practicability.

[0004] According to the first aspect of this application, a motor is provided. The motor includes:

[0005] A housing, an accommodation space is provided inside the housing;

[0006] A stator assembly, the stator assembly includes a mounting bracket and a magnetic part, the magnetic part is arranged on the mounting bracket, and the mounting bracket is arranged on the inner wall of the accommodation space;

[0007] A rotor assembly, the rotor assembly includes a swing shaft, a rotor core and a coil winding, the rotor core is arranged on the swing shaft, the coil winding is fixedly installed on the rotor core, the rotor core is arranged inside the mounting bracket, so that the swing shaft can swing through the interaction between the magnetic force generated by the rotor core and the magnetic force of the magnetic part, thereby cleaning each surface of the teeth, reducing the brushing time while ensuring the tooth cleaning degree, improving the brushing efficiency, and having high practicability;

[0008] Wherein, when the swing shaft swings around its own axis, the end of the rotor core forms a limit fit with the stator assembly or the inner side wall of the housing, so as to abut against the end of the rotor core after the rotor core crosses the outer end of the magnetic part, making the rotation space of the rotor core larger, thereby reducing the torque of the motor and improving the drivability of the motor.

[0009] In the motor according to an embodiment of the present application, the magnetic member has two opposite outer ends, and the rotor core has a first central axis extending in the radial direction. The swing range of the first central axis is between the two outer ends, which can not only achieve a large-angle swing of the swing axis, but also make the structure inside the motor more compact, reducing the motor torque and improving the motor drivability at the same time.

[0010] In the motor according to an embodiment of the present application, the magnetic member includes a first permanent magnet and a second permanent magnet. The first permanent magnet has a second central axis, and the second permanent magnet has a third central axis. The swing range of the first central axis is between the second central axis and the third central axis, which is more conducive to the return swing of the swing axis and ensures the driving force.

[0011] In the motor according to an embodiment of the present application, the rotor core includes a core body connected to the swing axis and core columns symmetrically arranged on both sides of the core body. The core columns extend radially outward at the end far from the core body to form an arc-shaped end face. The coil winding is fixed on the core columns. The arc-shaped end face can not only limit the coil winding on the core columns to prevent the coil winding from detaching from the core columns; moreover, the arc-shaped end face can better cooperate with the magnetic member during the rotation process, keep the rotation gap between the arc-shaped end face and the magnetic member unchanged, and cooperate with the stator assembly to limit the rotor core.

[0012] In the motor according to an embodiment of the present application, a groove portion is provided on the arc-shaped end face. The central axis of the groove portion in the radial direction passes through the axis of the swing axis. The magnetic member is arranged on both sides of the groove portion, so that the alternating magnetic field generated after the coil winding is energized can be further enhanced, thereby constraining the alternating magnetic field, improving the repulsive force or attractive force between the rotor assembly and the stator assembly, and enabling the rotor assembly to still maintain a large torque effect at the limit rotation angle.

[0013] In the motor according to an embodiment of the present application, the ratio of the depth of the groove portion to the radius of the arc-shaped end face is between 0.05 and 0.1 to ensure the intensity of the alternating magnetic field in the groove portion of the rotor core, so as to better cooperate with the static magnetic field of the magnetic member and be used to drive the swing of the swing axis.

[0014] In the motor according to an embodiment of the present application, the magnetic member includes two sets of permanent magnets. The two sets of permanent magnets are fixed on the mounting bracket and located on opposite sides of the swing axis, and the inner arc of the permanent magnet is adapted to the outer arc of the rotor core to ensure that the rotor core can make a reciprocating swing motion inside the inner side of the permanent magnet.

[0015] In the motor according to an embodiment of the present application, each group of the magnetic steels includes a first magnetic steel and a second magnetic steel with different magnetic poles. The first magnetic steel and the second magnetic steel are symmetrically arranged with respect to the central axis of the mounting bracket, so that after the coil winding is energized, a repulsive force can be generated between the arc-shaped end face and one of the first magnetic steel and the second magnetic steel, and an attractive force is generated between the arc-shaped end face and the other of the first magnetic steel and the second magnetic steel, thereby driving the swing shaft to swing.

[0016] In the motor according to an embodiment of the present application, the ratio of the distance between the first magnetic steel and the second magnetic steel to the width of the first magnetic steel and / or the second magnetic steel is between 0.7 and 1.2, so as to ensure the magnitude of the magnetic force between the first magnetic steel and the arc-shaped end face and the magnitude of the magnetic force between the second magnetic steel and the arc-shaped end face, so that the swing shaft can swing under the interaction of the arc-shaped end face, the first magnetic steel and the second magnetic steel; at the same time, the mutual interference of the magnetic forces between the first magnetic steel and the second magnetic steel is also avoided.

[0017] In the motor according to an embodiment of the present application, a hollow structure is formed inside the mounting bracket, and a plurality of placement grooves for fixing the magnetic members are provided on the inner side wall of the hollow structure. The plurality of placement grooves are symmetrically arranged on both sides of the hollow structure, so that the magnetic members installed on the placement grooves can be symmetrically arranged on both sides of the hollow structure, and at the same time, the installation positions of the magnetic members can be restricted, which is convenient for the installation of the magnetic members.

[0018] In the motor according to an embodiment of the present application, the hollow structure has a first arc-shaped wall and a second arc-shaped wall arranged opposite to each other, and the placement grooves are arranged on the first arc-shaped wall and the second arc-shaped wall, so that the swing shaft can reciprocally rotate within this arc range.

[0019] In the motor according to an embodiment of the present application, the ratio of the width of the magnetic member to the width of the hollow structure is not greater than 0.4, so that the swing shaft can swing under the interaction of the arc-shaped end face, the first magnetic steel and the second magnetic steel, and the mutual interference of the magnetic forces between the first magnetic steel and the second magnetic steel can also be avoided; and / or, the thickness of the magnetic member is greater than the thickness of the mounting bracket to ensure that the direction of the magnetic member can interact with the alternating magnetic field generated by the rotor assembly, so that the rotor assembly rotates around its swing shaft 21.

[0020] In the motor according to an embodiment of the present application, the minimum distance between the magnetic member and the rotor core is less than 0.5 mm to ensure the rotational resistance and output torque of the rotor assembly 20.

[0021] In the motor according to an embodiment of the present application, the rotation angle of the swing shaft around its own axis is between -60 degrees and 60 degrees, so that the brush head connected to the rotor assembly can clean each surface of the teeth. While ensuring the tooth cleanliness, the brushing time is reduced, the brushing efficiency is improved, and the practicability is high.

[0022] In the motor according to an embodiment of the present application, the motor further includes a buffer member, which is filled in the accommodation space and is used to provide a buffering effect when the rotor assembly swings. It can play a buffering role when the rotor assembly rotates to the maximum value, and at the same time can play a role in noise reduction during the rotation of the rotor assembly.

[0023] According to the second aspect of the present application, the present application further provides an electric toothbrush, including a brush head and the above-mentioned motor. The swing shaft of the motor is connected to the brush head and is used to control the brush head to reciprocally swing around the axis of the swing shaft.

[0024] The technical solution provided by the embodiments of the present application may include the following beneficial effects: The present application designs a motor and an electric toothbrush. The motor includes a housing, a stator assembly, and a rotor assembly. The stator assembly is accommodated in the accommodation space of the housing. The magnetic force generated by the rotor assembly interacts with the magnetic force of the stator assembly to achieve a large-angle swing, so that each surface of the teeth can be cleaned. While ensuring the tooth cleanliness, the brushing time is reduced, the brushing efficiency is improved, and it is applicable to people of different ages, with high practicability.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 is a schematic structural diagram of a motor provided by an embodiment of the present application;

[0028] Figure 2 is Figure 1 a cross-sectional view of the motor in

[0029] Figure 3 is Figure 1 an exploded view of the motor in

[0030] Figure 4 is Figure 2Exploded schematic diagram of the motor housing and the stator assembly;

[0031] Figure 5 is Figure 2 Structural schematic diagram of the stator assembly in;

[0032] Figure 6 is Figure 2 Structural schematic diagram of the motor housing in;

[0033] Figure 7 is Figure 2 Structural schematic diagram of the rotor assembly in;

[0034] Figure 8 is Figure 2 Exploded schematic diagram of the rotor assembly in;

[0035] Figure 9 is Figure 2 Cross-sectional schematic diagram of the rotor assembly in;

[0036] Figure 10 Is a cross-sectional schematic diagram of an electric toothbrush provided by an embodiment of the present application.

[0037] Explanation of reference numerals:

[0038] 100, motor; 200, handle housing; 300, brush head;

[0039] 10, housing; 11, motor housing; 111, accommodation space; 112, first rotating shaft hole; 12, housing end cover; 121, second rotating shaft hole; 13, first bearing member; 14, second bearing member;

[0040] 20, rotor assembly; 21, swing shaft; 21a, rotor core; 211, core body; 212, core column; 213, arc-shaped end face; 2131, groove portion; 21b, shaft body; 22, coil winding;

[0041] 30, stator assembly; 31, magnetic member; 311, first magnetic steel; 312, second magnetic steel; 31a, first magnetic steel group; 31b, second magnetic steel group; 32, mounting bracket; 321, placement groove;

[0042] 40, buffer member. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0044] It should also be understood that the terms used in the description of the present application are only for the purpose of describing specific embodiments. In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0045] The following will describe in detail some embodiments of the present application with reference to the accompanying drawings. Without conflict, the embodiments described below and the features in the embodiments can be combined with each other.

[0046] As Figures 1 to 3 shown, according to the first aspect of the present application, the present application provides a motor 100 for use in an electric toothbrush. The motor 100 includes a housing 10, a stator assembly 30, and a rotor assembly 20. An accommodation space 111 is provided inside the housing 10. The stator assembly 30 is disposed in the accommodation space 111. The rotor assembly 20 is disposed inside the stator assembly 30, and a preset rotational gap is maintained between the rotor assembly 20 and the stator assembly 30, so that the rotor assembly 20 can perform a large-angle swinging motion inside the stator assembly 30 under the interaction of magnetic forces, thereby driving the toothbrush head connected to the rotor assembly 20 to clean each surface of the teeth. While ensuring the tooth cleaning degree, the brushing time is reduced, the brushing efficiency is improved, and the practicability is high.

[0047] In an alternative embodiment, as Figure 2 、 Figure 4 and Figure 5 shown, the stator assembly 30 includes a mounting bracket 32 and a magnetic member 31. The magnetic member 31 is disposed on the mounting bracket 32, and the mounting bracket 32 is disposed on the inner wall of the accommodation space 111 to realize the fixed connection between the magnetic member 31 and the housing 10. Among them, the magnetic member 31 extends along the radial direction of the rotor assembly 20 and is located on the outer circumferential side of the rotor assembly 20, and is used to generate a static magnetic field so as to be able to interact with the alternating magnetic field generated by the rotor assembly 20, thereby causing the rotor assembly 20 to rotate around its swing axis 21.

[0048] In an optional embodiment, if Figure 2 , Figure 7 , Figure 8 and Figure 9 As shown, the rotor assembly 20 includes a swing shaft 21 and a coil winding 22. The swing shaft 21 includes a shaft body 21b and a rotor core 21a arranged on the shaft body 21b. The coil winding 22 is fixedly installed on the rotor core 21a. The rotor core 21a is rotated and installed in the mounting bracket 32, so that the swing shaft 21 can swing through the interaction between the magnetic force generated by the rotor core 21a and the magnetic force of the magnetic member 31. Compared with setting the coil winding 22 on the outside of the swing shaft 21 and then guiding the alternating magnetic field generated by it to the rotor core 21a through the shaft body 21b, the present application can not only simplify the structure and assembly steps, but also save the internal space of the motor, thereby effectively reducing the volume of the motor and realizing the miniaturization and lightness of the motor. Among them, the rotor core 21a can be set as an integral structure with the shaft body 21b, and the rotor core 21a can also be set as a separate structure with the shaft body 21b and then fixedly connected by assembly, which is not limited by the present application.

[0049] After adopting the above technical solution, since the coil winding 22 is arranged on the rotor core 21a, and the rotor core 21a is accommodated in the stator assembly 30, when the positive and negative alternating current is passed through the coil winding 22, the alternating magnetic field generated by it is used to interact with the static magnetic field of the stator assembly 30, so that the rotor assembly 20 rotates along the swing shaft 21. That is, the rotor assembly 20 and the stator assembly 30 alternately perform opposite attraction and same repulsion actions, thereby driving the swing shaft 21 to swing back and forth with left and right deflection, and output torque outward. When the motor is used in an electric toothbrush, the brush head of the electric toothbrush is connected to the swing shaft 21 in a transmission connection or directly connected, so that the brush head can reciprocate and / or swing back and forth under the drive of the motor, and its motion trajectory is more in line with the Bass brushing method, and the cleaning is healthier and more scientific, more efficient, and the effect of cleaning teeth is better.

[0050] In an optional embodiment, when the swing shaft 21 swings around its own axis, the end of the rotor core 21a forms a limiting fit with the stator assembly 30 or the inner wall of the housing 10, and can abut against the end of the rotor core 21a after the rotor core 21a passes over the outer end of the magnetic part 31, which can effectively limit the swing angle of the rotor core and also increase the rotation space of the rotor core 21a, thereby reducing the torque of the motor 100 and improving the drivability of the motor 100.

[0051] In an alternative embodiment, the magnetic member 31 has two opposite outer ends, and the rotor core 21a has a first central axis C1 extending in the radial direction. The swing range of the first central axis C1 is between the two outer ends, which can not only achieve a large-angle swing of the swing shaft 21, but also make the internal structure of the motor 100 more compact, reducing the torque of the motor 100 while improving the drivability of the motor 100.

[0052] In an alternative embodiment, the magnetic member 31 includes a first magnet and a second magnet. The first magnet has a second central axis C2, and the second magnet has a third central axis C3. The swing range of the first central axis C1 is between the second central axis C2 and the third central axis C3, which is more conducive to the reciprocating swing of the swing shaft and avoids the first central axis C1 crossing the second central axis C2 or the third central axis C3, which is not conducive to the return swing, thus ensuring the driving force. Wherein, the rotor core 21a is symmetrically arranged with respect to the first central axis C1, the first magnet is symmetrically arranged with respect to the second central axis C2, and the second magnet is symmetrically arranged with respect to the third central axis C3. In an alternative embodiment, as Figure 2 、 Figure 3 、 Figure 5 and Figure 6 shown, the housing 10 includes a motor housing 11 and a housing end cover 12. A receiving space 111 is formed inside the motor housing 11, and one end of the receiving space 111 is an open structure. A first rotating shaft hole 112 communicating with the receiving space 111 is provided at the other end of the receiving space 111, and the housing end cover 12 covers the open structure. Wherein, a second rotating shaft hole 121 is provided on the housing end cover 12. One end of the shaft body 21b is inserted into the first rotating shaft hole 112, and the other end of the shaft body 21b is inserted into the second rotating shaft hole 121, so that the rotor core 21a can drive the shaft body 21b to rotate under the interaction of the alternating magnetic field and the static magnetic field, so as to realize the reciprocating swing action of the shaft body 21b and output torque outward.

[0053] In an alternative embodiment, a first bearing member 13 is installed in the first rotating shaft hole 112, and a second bearing member 14 is installed in the second rotating shaft hole 121. Both ends of the shaft body 21b are connected to the inner rings of the first bearing member 13 and the second bearing member 14 respectively, further improving the coaxiality of the shaft body 21b and also improving the rotation efficiency of the shaft body 21b to ensure the smoothness of the rotation between the shaft body 21b and the housing 10.

[0054] In an alternative embodiment, as Figure 2 、 Figure 7 、 Figure 8 and Figure 9As shown, the rotor core 21a includes a core body 211 and a core column 212. The core body 211 is connected to the swing shaft 21. The core columns 212 are symmetrically arranged on both sides of the core body 211. The coil winding 22 is fixed on the core column 212 to increase the strength of the magnetic field after the coil winding 22 is energized. At the same time, the magnetic poles generated by the core column 212 after the coil winding 22 is energized can alternately perform opposite attraction and like repulsion actions with the stator assembly 30, thereby driving the swing shaft 21 to perform reciprocating swings to the left and right, and output torque to the outside. Among them, the core column 212 extends in all directions at one end away from the core body 211 to form an arc-shaped end face 213. The arc-shaped end face 213 can not only limit the coil winding 22 on the core column 212 to prevent the coil winding 22 from being separated from the core column 212; but also the arc-shaped end face 213 can better cooperate with the magnetic part 31 during rotation, so that the rotation gap between the arc-shaped end face 213 and the magnetic part 31 remains unchanged, and cooperates with the stator assembly 30 to limit the rotor core 21a.

[0055] In an optional embodiment, a groove portion 2131 is provided on the arc-shaped end surface 213, and the groove portion 2131 is recessed toward the axis of the swing shaft 21 along the radial direction of the arc-shaped end surface 213. The central axis of the groove portion 2131 along the radial direction passes through the axis of the swing shaft 21, and the magnetic member 31 is provided on both sides of the groove portion 2131, so that the alternating magnetic field generated after the coil winding 22 is energized can be further enhanced, thereby constraining the alternating magnetic field, improving the repulsive force or attractive force between the rotor assembly 20 and the stator assembly 30, and enabling the rotor assembly 20 to still maintain a large torque effect at an extreme rotation angle.

[0056] In an optional embodiment, the ratio of the depth of the groove portion 2131 to the radius of the arc-shaped end surface 213 is between 0.05 and 0.1, for example, the depth of the groove portion 2131 is 0.5 mm, and the radius of the arc-shaped end surface 213 is 6.1 mm; or the depth of the groove portion 2131 is 0.4 mm, and the radius of the arc-shaped end surface 213 is 6.1 mm; or the depth of the groove portion 2131 is 0.3 mm, and the radius of the arc-shaped end surface 213 is 6.1 mm; or the depth of the groove portion 2131 is 0.5 mm, and the radius of the arc-shaped end surface 213 is 10 mm, and so on, to ensure the strength of the alternating magnetic field of the rotor core 21a in the groove portion 2131, so that it can better cooperate with the static magnetic field of the magnetic part 31 to drive the swing shaft 21 to swing.

[0057] In an optional embodiment, the groove portion 2131 is in an arc-shaped structure, which facilitates the processing and forming of the core body 211 .

[0058] In an optional embodiment, if Figure 2 , Figure 4 and Figure 5As shown, the magnetic member 31 includes two sets of permanent magnets. The two sets of permanent magnets are fixed on the mounting bracket 32 and located on opposite sides of the swing shaft 21. The inner arc of the permanent magnet is adapted to the outer arc of the rotor core 21a to ensure that the rotor core 21a can reciprocate inside the inner side of the permanent magnet.

[0059] Exemplarily, the two sets of permanent magnets are respectively a first permanent magnet group 31a and a second permanent magnet group 31b. The mounting bracket 32 has opposite first and second mounting sides in the width direction. The first permanent magnet group 31a is arranged on the first mounting side, and the second permanent magnet group 31b is arranged on the second mounting side. Wherein, arc-shaped end faces 213 are formed on two opposite sides of the iron core column 212 on the iron core body 211, and the two arc-shaped end faces 213 are respectively arranged opposite to the first permanent magnet group 31a and the second permanent magnet group 31b.

[0060] In an alternative embodiment, each set of permanent magnets includes a first permanent magnet 311 and a second permanent magnet 312 with different magnetic poles. The first permanent magnet 311 and the second permanent magnet 312 are symmetrically arranged with respect to the central axis of the mounting bracket 32. After the coil winding 22 is energized, the arc-shaped end face 213 can generate a repulsive force with one of the first permanent magnet 311 and the second permanent magnet 312, and the arc-shaped end face 213 can generate an attractive force with the other of the first permanent magnet 311 and the second permanent magnet 312, thereby driving the swing shaft 21 to swing.

[0061] In an alternative embodiment, the first permanent magnet 311 of the first permanent magnet group 31a and the first permanent magnet 311 of the second permanent magnet group 31b are symmetrically arranged with respect to the central axis of the mounting bracket 32 extending in the height direction. The second permanent magnet 312 of the first permanent magnet group 31a and the second permanent magnet 312 of the second permanent magnet group 31b are symmetrically arranged with respect to the central axis of the mounting bracket 32 extending in the height direction. The first permanent magnet 311 and the second permanent magnet 312 are symmetrically arranged with respect to the central axis of the mounting bracket 32 extending in the width direction, so that the first permanent magnet 311 and the second permanent magnet 312 can be symmetrically distributed on the first mounting side and the second mounting side.

[0062] In an alternative embodiment, the ratio of the spacing L2 between the first magnetic steel 311 and the second magnetic steel 312 to the width L1 of the first magnetic steel 311 and / or the second magnetic steel 312 is between 0.7 and 1.2. For example, the spacing L2 is 3.35 mm and the width L1 is 3.3 mm; or the spacing L2 is 2.45 mm and the width L1 is 3.3 mm; or the spacing L2 is 2.6 mm and the width L1 is 3.3 mm; or the spacing L2 is 3.35 mm and the width L1 is 4.7 mm, etc., to ensure the magnetic force between the first magnetic steel 311 and the arc-shaped end face 213 and the magnetic force between the second magnetic steel 312 and the arc-shaped end face 213, so that the swing shaft 21 can swing under the interaction of the arc-shaped end face 213, the first magnetic steel 311 and the second magnetic steel 312; at the same time, the mutual interference of the magnetic forces between the first magnetic steel 311 and the second magnetic steel 312 is avoided.

[0063] It should be noted that the width L1 of the first magnetic steel 311 and the second magnetic steel 312 determines the rotational clearance between the rotor assembly 20 and the stator assembly 30. If the rotational clearance is too small, the rotational resistance of the rotor assembly 20 will increase; if the rotational clearance is too large, the rotational resistance of the rotor assembly 20 can be reduced and the swing angle of the rotor assembly 20 can be increased. Therefore, in this application, the width L1 of the first magnetic steel 311 and the second magnetic steel 312 can be designed according to the design requirements, and this application does not impose any restrictions.

[0064] In an alternative embodiment, a hollow structure is formed inside the mounting bracket 32, and a plurality of placement grooves 321 are provided on the inner side wall of the hollow structure for fixing the magnetic member 31, so that the magnetic member 31 can be firmly fixed on the mounting bracket 32. Among them, the plurality of placement grooves 321 are symmetrically arranged on both sides of the hollow structure, so that the magnetic members 31 mounted on the placement grooves 321 can be symmetrically arranged on both sides of the hollow structure, and at the same time, the mounting positions of the magnetic members 31 can be restricted, which is convenient for the installation of the magnetic members 31.

[0065] In an alternative embodiment, the hollow structure has a first arc-shaped wall and a second arc-shaped wall arranged opposite to each other, and the placement grooves 321 are provided on the first arc-shaped wall and the second arc-shaped wall. Among them, the arcs of the first arc-shaped wall and the second arc-shaped wall are adapted to the arcs of the magnetic member 31 and the arc-shaped end face 213, so that the swing shaft 21 can reciprocally rotate within the range of the arc.

[0066] In an alternative embodiment, the ratio of the width L1 of the magnetic member 31 to the width W2 of the hollow structure is not greater than 0.4. For example, the width L1 is 3.35 mm and the width W2 is 9.75 mm; or the width L1 is 3 mm and the width W2 is 9.75 mm; or the width L1 is 3.35 mm and the width W2 is 8.5 mm, etc., so that the swing shaft 21 can swing under the interaction of the arc-shaped end face 213, the first magnet 311 and the second magnet 312, and the mutual interference of the magnetic forces between the first magnet 311 and the second magnet 312 can also be avoided.

[0067] It should be noted that when the first magnet 311 and the second magnet 312 ensure sufficient magnetic field force, the width dimensions of the first magnet 311 and the second magnet 312 can be appropriately reduced, saving the internal space of the motor, thereby effectively reducing the volume of the motor and achieving miniaturization and lightweight of the motor. The thickness of the magnet is adjusted. If the thickness of the magnet is too thick, the resistance received by the rotor will increase. Reducing the thickness of the magnet and reducing the resistance of the rotor can increase the swing angle of the rotor.

[0068] In an alternative embodiment, the thickness D1 of the magnetic member 31 is greater than the thickness W2 of the mounting bracket 32 to ensure the magnitude of the magnetic force of the stator assembly 30. Among them, the thickness W2 of the mounting bracket 32 can affect the direction of the magnetic induction lines of the magnetic member 31, and thus can affect the rotation of the rotor assembly 20. Therefore, in this application, the thickness D1 of the magnetic member 31 and the thickness W2 of the mounting bracket 32 can be designed according to design requirements, and this application does not impose any restrictions.

[0069] In an alternative embodiment, the minimum distance between the magnetic member 31 and the rotor core 21a is less than 0.5 mm, such as 0.45 mm, 0.4 mm, 0.3 mm or any other suitable value between 0 and 0.5 mm, to ensure the rotational resistance and output torque of the rotor assembly 20.

[0070] In an alternative embodiment, the rotation angle of the swing shaft 21 about its own axis is between -60 degrees and 60 degrees. For example, the angles between A and B or between C and D are 40 degrees, 50 degrees, 120 degrees, etc., so that the brush head connected to the rotor assembly 20 can clean all surfaces of the teeth. While ensuring the tooth cleanliness, the brushing time is reduced and the brushing efficiency is improved, with high practicability.

[0071] In an alternative embodiment, the motor 100 further includes an angle detector for detecting the rotation angle of the swing shaft 21 and limiting the rotation angle of the swing shaft 21 within a predetermined rotation range, such as between -30 degrees and 30 degrees, which is not limited in this application.

[0072] In an alternative embodiment, the motor 100 further includes a buffer member 40 filled in the accommodation space 111 for providing a buffering effect when the rotor assembly 20 swings.

[0073] Exemplarily, the buffer member 40 is disposed between the rotor assembly 20 and the stator assembly 30, which can play a buffering role when the rotor assembly 20 rotates to the maximum value and can also play a noise reduction role during the rotation of the rotor assembly 20.

[0074] In an alternative embodiment, the buffer member 40 includes a wool felt or a gel. The wool felt or the gel can be evenly disposed on the outer side of the rotor assembly 20, which can play a buffering role when the rotor assembly 20 rotates to the maximum value and can also play a noise reduction role during the rotation of the rotor assembly 20.

[0075] As Figures 1 to 10 shown, according to the second aspect of the present application, the present application provides an electric toothbrush including a brush head 300 and a handle housing 200. The above-mentioned motor 100 is disposed in the handle housing 200. The swing shaft 21 of the motor 100 passes through the handle housing 200 for connecting with the brush head 200 to control the brush head 200 to reciprocally swing around the axis of the swing shaft 21, so as to clean each surface of the teeth, reduce the brushing time while ensuring the tooth cleanliness, improve the brushing efficiency, and have high practicability.

[0076] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0077] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the non-direct contact between the first and second features but through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the first feature has a lower horizontal height than the second feature.

[0078] The foregoing disclosure provides many different embodiments or examples for implementing the different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described above. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. Further, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0079] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A motor, characterized in that, The motor includes: a housing, an accommodation space being provided inside the housing; a stator assembly, the stator assembly including a mounting bracket and a magnetic member, the magnetic member being disposed on the mounting bracket, and the mounting bracket being disposed on the inner wall of the accommodation space; and, a rotor assembly, the rotor assembly including a swing shaft, a rotor core, and a coil winding, the rotor core being provided on the swing shaft, the coil winding being fixedly mounted on the rotor core, and the rotor core being disposed inside the mounting bracket such that the swing shaft can swing through the interaction of the magnetic force generated by the rotor core and the magnetic force of the magnetic member; wherein, when the swing shaft swings around its own axis, an end portion of the rotor core forms a limiting fit with the inner side wall of the stator assembly or the housing to abut against the end portion of the rotor core after the rotor core crosses the outer end portion of the magnetic member.

2. The motor according to claim 1, wherein, The magnetic member has two opposite outer end portions, and the rotor core has a first central axis extending in the radial direction, and the swing range of the first central axis is between the two outer end portions.

3. The motor according to claim 2, wherein, The magnetic member includes a first permanent magnet and a second permanent magnet, the first permanent magnet has a second central axis, the second permanent magnet has a third central axis, and the swing range of the first central axis is between the second central axis and the third central axis.

4. The motor according to claim 1, characterized in that, The rotor core includes a core body connected to the swing shaft and core columns symmetrically arranged on both sides of the core body, and the core columns extend around in the direction away from the core body to form an arc-shaped end face, and the coil winding is fixed on the core columns.

5. The motor according to claim 4, characterized in that, A groove portion is provided on the arc-shaped end face, and a central axis of the groove portion in the radial direction passes through the axis of the swing shaft, and the magnetic member is disposed on both sides of the groove portion.

6. The motor according to claim 5, characterized in that, The ratio of the depth of the groove portion to the radius of the arc-shaped end face is between 0.05 and 0.

1.

7. The motor according to claim 1, characterized in that, The magnetic member includes two sets of permanent magnets, the two sets of permanent magnets are fixed on the mounting bracket and are located on opposite sides of the swing shaft, and the inner arc of the permanent magnet is adapted to the outer arc of the rotor core.

8. The motor according to claim 7, characterized in that Each set of the permanent magnets includes a first permanent magnet and a second permanent magnet with different magnetic poles, and the first permanent magnet and the second permanent magnet are symmetrically arranged with respect to the central axis of the mounting bracket.

9. The motor according to claim 8, wherein The ratio of the distance between the first permanent magnet and the second permanent magnet to the width of the first permanent magnet and / or the second permanent magnet is between 0.7 and 1.

2.

10. The motor according to claim 1, characterized in that, A hollow structure is formed inside the mounting bracket, and a plurality of placement grooves for fixing the magnetic member are provided on the inner side wall of the hollow structure, and the plurality of placement grooves are symmetrically arranged on both sides of the hollow structure.

11. The motor according to claim 10, wherein The hollow structure has a first arc-shaped wall and a second arc-shaped wall arranged oppositely, and the placement grooves are provided on the first arc-shaped wall and the second arc-shaped wall.

12. The motor according to claim 11, characterized in that, The ratio of the width of the magnetic member to the width of the hollow structure is not greater than 0.4; and / or, the thickness of the magnetic member is greater than the thickness of the mounting bracket.

13. The motor according to claim 1, characterized in that, The minimum distance between the magnetic member and the rotor core is less than 0.5 mm.

14. The motor according to claim 1, characterized in that, The rotation angle of the swing shaft around its own axis is between -60 degrees and 60 degrees.

15. The motor according to claim 1, characterized in that, The motor further includes a buffer member, which is filled in the accommodation space and is used to provide a buffering effect when the rotor assembly swings.

16. An electric toothbrush, characterized in that, It includes a brush head and a handle housing, and the motor as described in any one of claims 1 to 15 is provided in the handle housing. The swing shaft of the motor passes through the handle housing and is used to connect to the brush head.

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