Swing motor, electric toothbrush and control system thereof
By designing a swing motor with magnetic steel arc surface and iron core arc surface, and combining a control system of sensors, processing modules and drive modules, the problem of fixed working frequency and swing of existing electric toothbrush motors is solved, and the motor is realized Improve efficiency and satisfy user personalized needs.
Patent Information
- Application Number
- CN202411588566.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-02-07
AI Technical Summary
The existing electric toothbrush motor has fixed working frequency and swing amplitude, making it difficult to meet the personalized oral cleaning needs of different users.
A swing motor is designed, which forms an opposite concave and convex structure through the arc surface of the magnetic steel between the stator and the rotor, keeps the air slit small, reduces the energy loss of the rotor rotation, and passes through sensors, processing modules and drives. The control system of the module adjusts the vibration frequency and swing of the motor.
It improves the efficiency of the motor, meets the personalized cleaning needs of different users, improves the user experience, and reduces production costs.
Smart Images
Figure CN119385708A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of oral cleaning, and in particular relates to a swing motor, an electric toothbrush and a control system thereof. Background Art
[0002] With the development of society, people's living standards are getting higher and higher, and the use of electric toothbrushes is becoming more and more common. However, the motors of existing electric toothbrushes usually adopt fixed working frequencies and swing amplitudes, that is, they can only operate in a single working mode. Although this can achieve automatic and efficient oral cleaning, in actual use, due to the different oral conditions and cleaning needs of each user, a single working mode is difficult to meet the personalized use needs of different users. Summary of the invention
[0003] The present application aims to provide a swing motor, which reduces the energy loss of the rotor rotation and improves the efficiency of the motor.
[0004] The embodiment of the present application provides a swing motor, comprising a stator and a rotor, wherein
[0005] The stator comprises an iron core and a winding, wherein the iron core comprises two opposite arms and a connecting portion connecting the two arms, the cross section of the iron core is U-shaped, and the winding is wound around the connecting portion.
[0006] The rotor is located between the two arms, and includes a magnetic steel and a magnetic conductor.
[0007] Observing along the axial direction of the swing motor, the surface of the magnetic steel facing the arm portion is a convex magnetic steel arc surface, and the surface of the arm portion facing the magnetic steel is a concave iron core arc surface.
[0008] In at least one possible implementation, the magnetic steel arc surface and the iron core arc surface are concentric arcs, and during the rotation of the rotor relative to the stator, the distance between the magnetic steel arc surface and the iron core arc surface remains unchanged.
[0009] In at least one possible implementation, the magnetic steel is formed as a single piece instead of being stacked and spliced.
[0010] In at least one possible implementation manner, two magnetic conductors are provided, and the two magnetic conductors are provided on both sides of the magnetic steel in the front-rear direction of the swing motor.
[0011] In at least one possible embodiment, the end of the swing motor has an end cover, the end cover is provided with a limiting hole, the rotor is provided with a limiting protrusion, the limiting protrusion is inserted into the limiting hole, and when the rotation angle of the rotor exceeds a predetermined angle, the limiting protrusion can contact the wall of the limiting hole, thereby limiting the rotation amplitude of the rotor.
[0012] In at least one possible implementation manner, the stator further includes an injection molded part, the iron core and the winding are surrounded by the injection molded part, and the iron core and the winding are fixed by the injection molded part.
[0013] In at least one possible implementation, in the front-rear direction of the swing motor, the output shaft of the motor is offset relative to the middle position of the swing motor.
[0014] In at least one possible implementation manner, the swing amplitude of the rotor is between -20 degrees and 20 degrees.
[0015] The embodiment of the present application further proposes an electric toothbrush, which includes a swing motor as described in any one of the above technical solutions.
[0016] The embodiment of the present application further proposes an electric toothbrush control system, comprising a swing motor as described in any one of the above technical solutions,
[0017] It also includes sensor module, processing module and drive module.
[0018] The sensor module is used to detect the working mode selected by the user.
[0019] The processing module is used to calculate and generate corresponding control signals according to the working mode.
[0020] The driving module adjusts the current frequency according to the control signal, so that the swing motor works at different vibration frequencies and swing amplitudes.
[0021] In at least one possible implementation, the driving module adjusts the frequency of the current in the form of a square wave by means of pulse width modulation, thereby adjusting the frequency and the swing amplitude of the rotor.
[0022] By adopting the above technical solution, the magnetic steel and the iron core form relatively concave and convex arc surfaces, so that the air gap of the motor is smaller, the energy loss of the rotor rotation is reduced, and the efficiency of the motor is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 A schematic diagram of the internal structure of an electric toothbrush according to an embodiment of the present application is shown.
[0024] Figure 2A cross-sectional view showing a partial structure of an electric toothbrush according to an embodiment of the present application.
[0025] Figure 3 An exploded view showing a partial structure of an electric toothbrush according to an embodiment of the present application.
[0026] Figure 4 An exploded view of a motor of an electric toothbrush according to an embodiment of the present application is shown.
[0027] Figure 5 A bottom view of a motor of an electric toothbrush according to an embodiment of the present application is shown.
[0028] Figure 6 A front view showing a motor of an electric toothbrush according to an embodiment of the present application is shown.
[0029] Figure 7 Shown along Figure 6 Cross-sectional view along line MM.
[0030] Figure 8 Shown along Figure 6 Cross-sectional view along line NN.
[0031] Fig. 9 A schematic structural diagram is shown in which the rotor of an electric toothbrush according to an embodiment of the present application swings at a certain angle relative to the stator.
[0032] Description of Reference Numerals
[0033] 100 Power assembly 200 Bracket 300 Circuit board
[0034] 1 Motor
[0035] 11 stator 111 iron core 1111 arm 1112 connection part 112 winding 113 injection molded part
[0036] 12 rotor 121 magnetic steel 122 magnetic conductor 123 rotor frame 1231 limiting convex part
[0037] 13 Output shaft
[0038] 14 Bearings
[0039] 15 end cover 151 limit hole
[0040] 16 Motor housing
[0041] 2 Motor rear accessories
[0042] 3. Vibration-damping rubber
[0043] M1 magnetic steel arc surface M2 iron core arc surface
[0044] A is the axis, F is the front-to-back direction, and R is the left-to-right direction. DETAILED DESCRIPTION
[0045] In order to more clearly explain the above-mentioned purposes, features and advantages of the present application, the specific implementation methods of the present application are described in detail in this section in conjunction with the accompanying drawings. In addition to the various implementation methods described in this section, the present application can also be implemented in other different ways. Without violating the spirit of the present application, those skilled in the art can make corresponding improvements, deformations and substitutions, so the present application is not limited by the specific embodiments disclosed in this section. The scope of protection of the present application shall be subject to the claims.
[0046] In the following description, the axial direction A( Figure 1 and Figure 2 The up-down direction in the figure refers to the extension direction of the electric toothbrush, that is, the extension direction of the output shaft of the motor, and the front-back direction F ( Figure 7 The left-right direction in the left-right direction refers to the extension direction of the bristles of the electric toothbrush, where the side where the bristles are located is the front side, and the left-right direction R ( Figure 1 and Figure 2 The left-right direction in the motor is perpendicular to the axial direction A and the front-to-back direction F. The axial direction A of the motor is consistent with the axial direction A of the electric toothbrush, the front-to-back direction F of the motor is consistent with the front-to-back direction F of the electric toothbrush, and the left-right direction R of the motor is consistent with the left-to-right direction R of the electric toothbrush.
[0047] like Figures 1 to 9 As shown, the embodiment of the present application provides an electric toothbrush, which includes a power assembly 100, a bracket 200 and a circuit board 300. The power assembly 100 and the circuit board 300 can be connected to the bracket 200.
[0048] like Figures 1 to 3 As shown, the power assembly 100 may include a swing motor 1 (hereinafter referred to as the motor), a motor rear accessory 2 and a vibration-damping adhesive 3. The motor 1 may be mounted on a bracket 200 through the motor rear accessory 2. The motor rear accessory 2 is located at the tail end of the axial direction A of the motor 1, and the vibration-damping adhesive 3 may be located at the head end of the axial direction A of the motor 1. The motor rear accessory 2 and the vibration-damping adhesive 3 may reduce the transmission of vibration from the motor 1 to the bracket 200.
[0049] like Figures 4 to 8 As shown, the motor 1 includes a stator 11 , a rotor 12 , an output shaft 13 , a bearing 14 , an end cover 15 and a motor housing 16 .
[0050] The end cover 15 can be connected to the axial ends of the motor housing 16, the stator 11 can be connected to the end cover 15 and / or the motor housing 16, and the rotor 12 can be connected to the end cover 15 through the bearing 14, so that the rotor 12 can rotate smoothly relative to the stator 11 with less friction and wear. The motor housing 16 can surround the stator 11, the rotor 12 and the bearing 14, and the output shaft 13 can be connected to the rotor 12, and the output shaft 13 extends from the inside of the motor housing 16. The motor housing 16 is used to protect the internal components of the motor and prevent dust, moisture or other external environments from affecting the operation of the motor.
[0051] The stator 11 includes an iron core 111 , a winding 112 and an injection molded part 113 .
[0052] like Figure 4 and Figure 8 As shown, the cross section of the core 111 is U-shaped, and the core 111 includes two opposite arms 1111 and a connecting portion 1112 connecting the two arms 1111, and the winding 112 can be wound around the connecting portion 1112. The winding 112 can generate a magnetic field after being energized, and the U-shaped core 111 can concentrate the magnetic flux in a specific area, enhance the electromagnetic effect, and form a closed magnetic circuit. The U-shaped opening and the bottom of the cross section of the core 111 are opposite to each other in the front-to-back direction F of the motor.
[0053] The injection molded part 113 can be formed by an injection molding process, wrapped around the iron core 111, fixed the iron core 111 and the winding 112, improved the mechanical strength of the iron core 111 and the winding 112, prevented the winding 112 from moving relative to the iron core 111, and ensured the stability of the overall structure.
[0054] The rotor 12 may be located between the two arms 1111, and the rotor 12 includes a magnetic steel 121, a magnetizer 122, and a rotor frame 123. The magnetic steel 121 and the magnetizer 122 may be connected to the rotor frame 123, and the rotor frame 123 may be rotatably connected to the end cover 15 relative to the stator 11 through a bearing 14. Two magnetizers 122 may be provided, and the two magnetizers 122 may be provided on both sides of the magnetic steel 121 in the front-rear direction F of the electric toothbrush. The magnetizer 122 may be made of iron.
[0055] Reference Figure 8 Observing along the axial direction A of the electric toothbrush, the surface of the magnet 121 facing the arm 1111 is a convex magnet arc surface M1, and the surface of the arm 1111 facing the magnet 121 is a concave iron core arc surface M2.
[0056] The magnetic steel arc surface M1 and the iron core arc surface M2 can be concentric arcs, and the bearing 14 is located at the axial center of the magnetic steel arc surface M1 and the iron core arc surface M2. During the rotation of the rotor 12 relative to the stator 11, the distance between the magnetic steel arc surface M1 and the iron core arc surface M2 can remain unchanged. In this way, the air gap of the motor can be smaller, and the air gap can be kept unchanged during the rotation of the rotor 12, so that the energy loss of the rotor 12 is smaller, and the efficiency of the motor is improved.
[0057] like Figure 5 and Figure 7 As shown, in the front-to-back direction F of the electric toothbrush, the output shaft 13 of the motor 1 is offset relative to the middle position of the motor 1 .
[0058] The magnet 121 is formed of a single piece, rather than being stacked and spliced, so that the assembly process is simpler and the splicing error is reduced. In addition, compared with the stacked and spliced magnets, the one-piece magnet reduces the seams and gaps produced by splicing, can better control the distribution of the magnetic field, provide a continuous magnetic circuit, reduce magnetic resistance, thereby increasing the magnetic flux and reducing magnetic leakage. The one-piece magnet has a higher magnetic energy product, and can store and provide a stronger magnetic field at the same volume compared to the stacked and spliced magnets, and the magnetic properties are more consistent and uniform. The one-piece magnet can increase the magnetic field strength, increase the magnetic flux of the motor, enable the motor to generate greater torque, and improve the efficiency of the motor.
[0059] like Figure 5 and Figure 7 As shown, the tail end ( Figure 7 The end cover 15 of the rotor 12 (lower end) can be provided with a limiting hole 151, which can be a rectangle or a rounded rectangle, and the rotor frame 123 of the rotor 12 can be provided with a limiting protrusion 1231, which can be inserted into the limiting hole 151. When the rotation angle of the limiting protrusion 1231 exceeds a predetermined angle, the limiting protrusion 1231 can contact the wall of the limiting hole 151, thereby limiting the rotation range of the rotor 12, so that the magnetic steel arc surface M1 of the rotor 12 can be kept within the range of the core arc surface M2. It can be understood that Figure 8 The middle position of the magnetic steel arc surface M1 shown in FIG. 1 is opposite to the middle position of the core arc surface M2 and can be defined as the initial position of the rotor 12, that is, the swing amplitude is 0 degrees. Fig. 9 For example, the swing amplitude (swing angle P) of the rotor 12 can be limited to be adjusted between, for example, -20 degrees and 20 degrees relative to the initial position.
[0060] The present application also proposes an electric toothbrush control system, which includes a sensor module, a processing module and a driving module. The sensor module is used to detect the working mode selected by the user. In different working modes, the motor can work at different vibration frequencies and swing amplitudes. The processing module is used to calculate and generate corresponding control signals according to the working mode. The driving module can adjust the current frequency according to the control signal so that the motor works at different vibration frequencies and swing amplitudes.
[0061] The current passing through the winding 112 can generate an electromagnetic field, and the driving module can adjust the frequency of the current in the form of a square wave through pulse width modulation (PWM), so that the magnetic poles of the electromagnetic field are constantly changing, and then the force direction of the rotor 12 can be continuously deformed so that the rotor 12 can swing. Compared with the method of using elastic force to swing the motor output shaft, the present application uses electromagnetic force to change the direction of the rotor so that the motor can operate stably for a long time, without worrying about the life attenuation and failure of the elastic part after long-term use.
[0062] Furthermore, the frequency of the pulse width modulation (PWM) current includes but is not limited to square waves, sine waves, and triangular waves; the frequency of the square wave determines the vibration frequency of the motor, that is, the number of cycles completed per unit time. In an electric toothbrush, it means the swing speed of the brush head. A higher frequency will result in a faster swing speed, thereby improving cleaning efficiency. The amplitude of the square wave directly affects the size of the motor drive current, which in turn affects the swing amplitude of the rotor. A larger amplitude means a stronger driving force and will present a larger swing amplitude. Due to its smooth transition characteristics, the sine wave can reduce electromagnetic interference and mechanical wear, and is suitable for occasions with high requirements for running stability. The triangular wave is between the square wave and the sine wave, with a faster response speed and can reduce some stress concentration problems caused by rapid changes.
[0063] W=PT (where W is work, P is power, and T is the action time of a pair of positive and negative voltages). When the output voltage amplitude and output power remain unchanged, the smaller T is, the smaller W is, and therefore the angle (amplitude) of motor rotation also becomes smaller.
[0064] When the frequency of the square wave signal is high, the current direction switches faster. The rotor 12 does not have enough time to complete a large angle of rotation, and the magnetic field direction of the stator 11 changes, causing the force direction of the rotor 12 to change, so the motor swing is small and the vibration frequency is high.
[0065] When the frequency of the square wave signal is low, the current direction switches slowly, and the rotor 12 has more time to rotate at a large angle before the magnetic field direction of the stator 11 changes, causing the force direction of the rotor 12 to change. The rotor 12 has sufficient time to rotate, so the motor has a larger swing amplitude and a lower vibration frequency.
[0066] Under the action of currents of different frequencies, the vibration frequency and swing amplitude of the motor can be adjusted to meet the needs of different users. Users can choose the appropriate vibration frequency and swing amplitude according to their oral conditions and cleaning needs to achieve personalized oral cleaning and improve user experience. Manufacturers of electric toothbrushes do not need to produce models with different vibration frequencies and swing amplitudes according to different user needs, thereby reducing manufacturing costs. The vibration frequency of the motor can be between 12,000 Hz and 48,000 Hz.
[0067] At least one of the sensor module, the processing module, and the driving module may be disposed on the circuit board 300 .
[0068] The following describes the process of adjusting the vibration frequency and amplitude of an electric toothbrush.
[0069] S100: After the user selects a desired mode through an input device (such as a button or a touch screen), the corresponding vibration frequency and amplitude are matched.
[0070] S200: After the sensor module detects user input, it transmits the user input information to the processing module.
[0071] S300: The processing module calculates and generates a corresponding control signal according to a preset algorithm, and sends the control signal to the driving module.
[0072] S400 , after receiving the control signal, the driving module adjusts the frequency of the current, thereby adjusting the vibration frequency and swing amplitude of the motor.
[0073] It can be understood that the motor of the present application can be used not only for electric toothbrushes, but also for other products that can oscillate back and forth, such as electric shavers, electric massagers, etc.
[0074] It should be understood that at least some aspects or features of the above-mentioned implementation modes, embodiments or examples may be appropriately combined.
[0075] It is understood that in the present application, when the number of parts or components is not particularly limited, the number may be one or more, and the multiple here means two or more. For the case where the number of parts or components shown in the drawings and / or described in the specification is a specific number such as two, three, four, etc., the specific number is usually exemplary and not restrictive, and it can be understood as multiple, that is, two or more, but this does not mean that the present application excludes the case of one.
[0076] In the present application, unless otherwise clearly stated or limited, the terms such as "install", "assemble", "assemble", "connect", "connect", "couple", "link", "abut", "connect", "interconnect", "intercommunication", "conduction", "fixation", "fastening" and the like should be understood in a broad sense, for example, they can be direct or indirect. For example, regarding connection, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly stated or limited. For example, regarding connectivity / conduction, it can be direct connectivity / conduction, or it can be indirect connectivity / conduction via an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.
[0077] In the present application, unless otherwise clearly stated or limited, a component disposed on / installed on / located on / accommodated on / placed in, within, inside, etc. another component may be any of the following two situations: a part or most of the one component is located in the other component; and the one component is completely accommodated in the other component.
[0078] Although the present application is described in detail using the above-mentioned embodiments, it is obvious to those skilled in the art that the present application is not limited to the embodiments described in this specification. The present application can be modified and implemented as a modified embodiment without departing from the subject matter and scope of the present application as determined by the claims. Therefore, the description in this specification is for the purpose of illustration and does not have any restrictive meaning for the present application.
Claims
1. A swing motor, characterized in that: It comprises a stator (11) and a rotor (12), wherein The stator (11) comprises an iron core (111) and a winding (112); the iron core (111) comprises two opposite arm portions (1111) and a connecting portion (1112) connecting the two arm portions (1111); the cross section of the iron core (111) is U-shaped; the winding (112) is wound around the connecting portion (1112); The rotor (12) is located between the two arm portions (1111), and the rotor (12) comprises a magnetic steel (121) and a magnetic conductor (122). Observing along the axial direction (A) of the swing motor, the surface of the magnetic steel (121) facing the arm portion (1111) is a convex magnetic steel arc surface (M1), and the surface of the arm portion (1111) facing the magnetic steel (121) is a concave iron core arc surface (M2).
2. The swing motor according to claim 1, characterized in that: The magnetic steel arc surface (M1) and the iron core arc surface (M2) are concentric circular arcs, and when the rotor (12) rotates relative to the stator (11), the distance between the magnetic steel arc surface (M1) and the iron core arc surface (M2) remains unchanged.
3. The swing motor according to claim 1, characterized in that: The magnetic steel (121) is formed as a single piece instead of being stacked and spliced.
4. The swing motor according to claim 1, characterized in that: Two magnetizers (122) are provided, and the two magnetizers (122) are arranged on both sides of the magnetic steel (121) in the front-rear direction (F) of the swing motor.
5. The swing motor according to claim 1, characterized in that: The end of the swing motor is provided with an end cover (15), the end cover (15) is provided with a limiting hole (151), the rotor (12) is provided with a limiting convex portion (1231), the limiting convex portion (1231) is inserted into the limiting hole (151), and when the rotation angle of the rotor (12) exceeds a predetermined angle, the limiting convex portion (1231) can contact the wall of the limiting hole (151), thereby limiting the rotation amplitude of the rotor (12).
6. The swing motor according to claim 1, characterized in that: The stator (11) further comprises an injection molded part (113), the iron core (111) and the winding (112) are surrounded by the injection molded part (113), and the iron core (111) and the winding (112) are fixed by the injection molded part (113).
7. The swing motor according to claim 1, characterized in that: In the front-rear direction (F) of the swing motor, the output shaft of the motor is offset relative to the middle position of the swing motor.
8. The swing motor according to claim 1, characterized in that: The swing amplitude of the rotor (12) is between -20 degrees and 20 degrees.
9. An electric toothbrush, characterized in that: The electric toothbrush comprises the oscillating motor according to any one of claims 1 to 8.
10. An electric toothbrush control system, characterized in that: The oscillating motor according to any one of claims 1 to 8, It also includes sensor module, processing module and drive module. The sensor module is used to detect the working mode selected by the user. The processing module is used to calculate and generate corresponding control signals according to the working mode. The driving module adjusts the current frequency according to the control signal, so that the swing motor works at different vibration frequencies and swing amplitudes.
11. The electric toothbrush control system according to claim 10, characterized in that: The driving module adjusts the frequency of the current in the form of a square wave by means of pulse width modulation, thereby adjusting the frequency and swing amplitude of the rotor.