Motor and electric toothbrush

Abstract

The present application provides a motor and an electric toothbrush, wherein the motor comprises a housing, a stator assembly, a rotor assembly, a motor shaft and a driving circuit board; the stator assembly is located in the housing, the rotor assembly is located in the stator assembly and is arranged on the motor shaft, and the stator assembly, the rotor assembly and the motor shaft all extend from the first end of the housing to the second end of the housing; wherein the first end of the motor shaft extends out of the first end of the housing, the second end of the motor shaft is provided with a linkage, the driving circuit board is provided with the second end of the housing, a driving chip and a detection component are provided on the driving circuit board, the driving chip is used to drive the rotor assembly to drive the motor shaft and the linkage component to rotate relative to the stator assembly, and the detection component is used to detect the state of the linkage component and feed back to the driving chip. The present application improves the control accuracy of the motor and reduces the energy consumption of the motor.

Description

Technical Field

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

[0002] As an energy conversion device, the core function of the motor is to efficiently convert electrical energy into mechanical energy. It operates based on the principle of electromagnetic induction. When current passes through the coil of the motor, a magnetic field is generated around it. This magnetic field interacts with the permanent magnet inside the motor or the magnetic field generated by another set of energized coils, thereby generating a rotational force to drive the motor's rotor to rotate.

[0003] Currently, motors are facing a series of technical challenges in the pursuit of achieving various specific control goals, such as fast responsiveness, high-precision positioning, and dynamic performance optimization. To achieve these high-performance requirements, motors often use more complex control systems and more advanced materials to ensure that the specified actions can be completed accurately and quickly under various working conditions.

[0004] However, while this series of technical upgrades and optimization measures significantly improve the motor control capabilities, they also inevitably lead to an increase in energy consumption. The motor requires higher starting current and more frequent power adjustments, which also increases the loss in the process of converting electrical energy into mechanical energy. Similarly, in order to maintain high-precision operation, precise sensors, complex algorithm processing, and high-precision actuators all require continuous power supply, which further increases the overall energy consumption of the motor. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present application provides a motor and an electric toothbrush.

[0006] The specific technical solutions are as follows:

[0007] A motor comprises a housing, a stator assembly, a rotor assembly, a motor shaft and a drive circuit board;

[0008] The stator assembly is located in the housing, the rotor assembly is located in the stator assembly and is arranged on the motor shaft, and the stator assembly, the rotor assembly and the motor shaft all extend from the first end of the housing to the second end of the housing;

[0009] Wherein, the first end of the motor shaft extends out of the first end of the housing, the second end of the motor shaft is provided with a linkage member, the drive circuit board is provided at the second end of the housing, a drive chip and a detection member are provided on the drive circuit board, the drive chip is used to drive the rotor assembly to drive the motor shaft and the linkage member to rotate relative to the stator assembly, and the detection member is used to detect the state of the linkage member and feed back to the drive chip;

[0010] The power of the motor changes with the torque of the motor shaft, first increasing and then decreasing; the efficiency of the motor changes with the torque of the motor shaft, first increasing and then decreasing;

[0011] When the motor is at maximum power, the torque of the motor shaft is α; when the motor is at maximum efficiency, the torque of the motor shaft is β;

[0012] Among them, α and β satisfy the following relationship: 0<|α-β|<20.

[0013] In one embodiment, the torque of the motor shaft is between 0 and 50 mNm;

[0014] And / or, the rotation speed of the motor shaft is between 0 and 4000 rpm;

[0015] And / or, the current of the motor is between 0.1 and 2.4 A;

[0016] And / or, the power of the motor is between 0 and 8w;

[0017] And / or, the efficiency of the motor is between 0 and 80%.

[0018] In one embodiment, the change in the rotation speed of the motor shaft is linearly negatively correlated with the change in the torque of the motor shaft, and the slope thereof is between -120 and -60.

[0019] In one embodiment, the current change of the motor is linearly positively correlated with the torque change of the motor shaft, and the slope thereof is between 0.04 and -0.07.

[0020] In one embodiment, the power of the motor varies with the torque of the motor shaft, and varies in a parabolic or quasi-parabolic manner.

[0021] In one embodiment, the stator assembly and the rotor assembly are separated so that a first airflow channel is formed between the stator assembly and the rotor assembly;

[0022] In a plane perpendicular to the axis of the housing, a cross section of the first airflow channel is annular or quasi-annular.

[0023] In one embodiment, the stator assembly includes a stator core and a stator winding, the inner wall of the stator core is formed with a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the circumference of the stator core;

[0024] The protruding column includes a protruding portion and an extended portion. The inner wall of the stator core protrudes outward to form the protruding portion and the extended portion in sequence. The stator winding is arranged on the protruding portion. The surface of the extended portion close to the rotor assembly is an inwardly concave arc surface.

[0025] In one embodiment, the rotor assembly includes a rotor core and a plurality of magnetic parts, the rotor core having a hollow structure, the motor shaft passing through the rotor core, the outer wall of the rotor core forming a number of accommodating grooves that is the same as the number of the magnetic parts, the magnetic parts being located in the accommodating grooves, and a surface of one side of the magnetic parts close to the stator assembly being an arc-shaped surface protruding outward.

[0026] In one embodiment, the driving circuit board has a first surface and a second surface, the distance between the first surface and the linkage member is smaller than the distance between the second surface and the linkage member, the detection member is arranged on the first surface, and the driving chip is arranged on the second surface.

[0027] An electric toothbrush comprises a housing, a main control circuit board, a brush head and the motor described in any one of the above embodiments;

[0028] The main control circuit board and the motor are arranged on the housing, the first end of the motor shaft extends out of the housing, and the brush head is arranged at the first end of the motor shaft. The main control circuit board is used to output a control signal to the driving chip, and the driving chip is used to drive the rotor assembly to drive the motor shaft, the linkage and the brush head to rotate relative to the stator assembly based on the received control signal.

[0029] This application has at least the following beneficial effects:

[0030] The present application provides a motor, comprising a casing, a stator assembly, a rotor assembly, a motor shaft and a driving circuit board; the stator assembly is located in the casing, the rotor assembly is located in the stator assembly and is arranged on the motor shaft, and the stator assembly, the rotor assembly and the motor shaft all extend from the first end of the casing to the second end of the casing; wherein the first end of the motor shaft extends out of the first end of the casing, the second end of the motor shaft is provided with a linkage part, the driving circuit board is provided at the second end of the casing, a driving chip and a detection part are provided on the driving circuit board, the driving chip is used to drive the rotor assembly to drive the motor shaft and the linkage part to rotate relative to the stator assembly, and the detection part is used to detect the state of the linkage part and feed back to the driving chip; wherein the power of the motor changes with the torque of the motor shaft, first increasing and then decreasing; the efficiency of the motor changes with the torque of the motor shaft, first increasing and then decreasing; when the motor is at maximum power, the torque of the motor shaft is α; when the motor is at maximum efficiency, the torque of the motor shaft is β; wherein α and β satisfy the following relationship: 0<|α-β|<20.

[0031] The present application provides an electric toothbrush, comprising a shell, a main control circuit board, a brush head and the motor described above; the main control circuit board and the motor are arranged on the shell, the first end of the motor shaft extends out of the shell, the brush head is arranged at the first end of the motor shaft, the main control circuit board is used to output a control signal to the drive chip, and the drive chip is used to drive the rotor assembly to drive the motor shaft, the linkage and the brush head to rotate relative to the stator assembly based on the received control signal.

[0032] The present application achieves self-driving capability by highly integrating the motor and the driving circuit board, abandons the traditional mode of using the main control circuit board as an intermediary to drive the motor, simplifies the motor drive architecture, and greatly reduces the cumbersome signal transmission process and energy conversion steps between the main control circuit board and the motor, thereby achieving instant connection between the control signal and the motor action, minimizing the loss and interference of the control signal during the transmission process, thereby greatly improving the control accuracy of the motor.

[0033] Moreover, in the traditional driving mode, the control signal needs to be processed by the main control circuit board at multiple levels, and then transmitted to the motor driving circuit through the connecting cable. During this period, the control signal is easily interfered with, resulting in quality degradation, and there will be a large loss of electric energy during multiple conversions. Since the present application highly integrates the motor and the driving circuit board, giving the motor self-driving capability, it curbs the energy loss caused by multiple conversions and transmissions at the source, avoids unnecessary energy loss, and thus reduces the overall power consumption of the motor, and significantly optimizes the energy utilization efficiency of the motor.

[0034] In addition, the present application highly integrates the motor and the driving circuit board, making the energy transfer path from the source to the terminal more direct and efficient, reducing the energy consumption in the intermediate links, and enabling the motor to more fully convert the input electrical energy into effective mechanical work output during actual operation, thereby increasing the motor's speed and torque, allowing the motor to operate more efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 The structure of the motor provided in this embodiment is shown in FIG. Figure 1 ;

[0037] Figure 2 A schematic diagram of the relationship between the rotation speed, current, power efficiency and torque of the motor provided in this embodiment;

[0038] Figure 3 The structure of the motor provided in this embodiment is shown in FIG. Figure 2 ;

[0039] Figure 4 for Figure 3 Schematic diagram of the cross section of the AA line Figure 1 ;

[0040] Figure 5 for Figure 3 Schematic diagram of the cross section of the AA line Figure 2 ;

[0041] Figure 6 The structure of the driving circuit board of the motor provided in this embodiment is shown in FIG. Figure 1 ;

[0042] Figure 7 The structure of the driving circuit board of the motor provided in this embodiment is shown in FIG. Figure 2 ;

[0043] Figure 8 The structure of the motor provided in this embodiment is shown in FIG. Figure 3 ;

[0044] Fig. 9 for Figure 8 A partial enlarged view of the middle B area;

[0045] Fig.10 This is a schematic diagram of the structure of the electric toothbrush provided in this embodiment.

[0046] Reference numerals:

[0047] 1- housing; 2- stator assembly; 3- rotor assembly; 4- motor shaft; 5- driving circuit board; 6- housing; 7- main control circuit board; 11- first end of housing; 12- second end of housing; 13- first air flow channel; 22- stator core; 31- rotor core; 32- magnetic member; 41- first end of motor shaft; 42- second end of motor shaft; 43- linkage member; 51- first surface; 52- second surface; 53- second air flow channel; 54- third air flow channel; 221- boss; 311- receiving groove; 321- arcuate surface protruding outward; 511- detection member; 512- electronic component; 521- driving chip; 522- input-output module; 2211- protruding portion; 2212- extension portion; 22121- arcuate surface recessed inward. DETAILED DESCRIPTION

[0048] Hereinafter, various embodiments of the present application will be described more fully. The present application may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present application to the specific embodiments disclosed herein, but the present application should be understood to cover all adjustments, equivalents and / or alternatives within the spirit and scope of the various embodiments of the present application.

[0049] Hereinafter, the term "include" or "may include" used in various embodiments of the present application indicates the presence of a disclosed function, operation, or element, and does not limit the addition of one or more functions, operations, or elements. In addition, as used in various embodiments of the present application, the terms "include", "have", and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components, or a combination of the foregoing or the possibility of adding one or more features, numbers, steps, operations, elements, components, or a combination of the foregoing.

[0050] In various embodiments of the present application, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the words listed at the same time. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0051] The expressions (such as "first", "second", etc.) used in the various embodiments of the present application may modify the various constituent elements in the various embodiments, but may not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of the present application, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0052] It should be noted that in this application, unless otherwise clearly specified and defined, the terms "installation", "connection", "fixation" and the like 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 a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] In the present application, a person of ordinary skill in the art should understand that the terms indicating orientation or positional relationship herein are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0054] The terms used in the various embodiments of the application are only used to describe the purpose of specific embodiments and are not intended to limit the various embodiments of the application. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise limited, all terms used here (including technical terms and scientific terms) have the same meaning as the meanings commonly understood by ordinary technicians in the field of the various embodiments of the application. The terms (such as the terms defined in the dictionary generally used) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments of the application.

[0055] Currently, motors are facing a series of technical challenges in the pursuit of achieving various specific control goals, such as fast responsiveness, high-precision positioning, and dynamic performance optimization. To achieve these high-performance requirements, motors often use more complex control systems and more advanced materials to ensure that the specified actions can be completed accurately and quickly under various working conditions.

[0056] However, while this series of technical upgrades and optimization measures significantly improve the motor control capabilities, they also inevitably lead to an increase in energy consumption. The motor requires higher starting current and more frequent power adjustments, which also increases the loss in the process of converting electrical energy into mechanical energy. Similarly, in order to maintain high-precision operation, precise sensors, complex algorithm processing, and high-precision actuators all require continuous power supply, which further increases the overall energy consumption of the motor.

[0057] Based on this, the present application provides a motor, such as Figure 1-Figure 8 As shown, it includes a housing 1, a stator assembly 2, a rotor assembly 3, a motor shaft 4 and a drive circuit board 5;

[0058] The stator assembly 2 is located in the housing 1, the rotor assembly 3 is located in the stator assembly 2 and is arranged on the motor shaft 4, and the stator assembly 2, the rotor assembly 3 and the motor shaft 4 all extend from the first end 11 of the housing to the second end 12 of the housing;

[0059] The first end 41 of the motor shaft extends out of the first end 11 of the housing, the second end 42 of the motor shaft is provided with a linkage member 43, the driving circuit board 5 is provided with the second end 12 of the housing, the driving circuit board 5 is provided with a driving chip 521 and a detection member 511, the driving chip 521 is used to drive the rotor assembly 3 to drive the motor shaft 4 and the linkage member 43 to rotate relative to the stator assembly 2, and the detection member 511 is used to detect the state of the linkage member 43 and feed back to the driving chip 521;

[0060] like Figure 2 As shown, in one embodiment, Figure 2 The middle power line is a curve of the power of the motor and the torque of the motor shaft 4. The power of the motor increases first and then decreases as the torque of the motor shaft 4 changes. Figure 2 The middle efficiency line is a curve showing a change in the power of the motor and the torque of the motor shaft 4 . The efficiency of the motor increases first and then decreases as the torque of the motor shaft 4 changes.

[0061] When the motor is at maximum power, the torque of the motor shaft 4 is α; when the motor is at maximum efficiency, the torque of the motor shaft 4 is β;

[0062] Among them, α and β satisfy the following relationship: 0<|α-β|<20.

[0063] The present application achieves self-driving capability by highly integrating the motor and the driving circuit board 5, abandons the traditional mode of using the main control circuit board 7 as an intermediary to drive the motor, simplifies the motor driving architecture, and greatly reduces the cumbersome signal transmission process and energy conversion steps between the main control circuit board 7 and the motor, thereby achieving instant connection between the control signal and the motor action, minimizing the loss and interference of the control signal during the transmission process, thereby greatly improving the control accuracy of the motor.

[0064] Moreover, in the traditional driving mode, the control signal needs to be processed by the main control circuit board 7 at multiple levels, and then transmitted to the motor driving circuit through the connecting cable. During this period, the control signal is easily interfered with, resulting in quality degradation, and there will be a large loss of electric energy during multiple conversions. Since the present application highly integrates the motor and the driving circuit board 5, giving the motor self-driving capability, it curbs the energy loss caused by multiple conversions and transmissions at the source, avoids unnecessary energy loss, and thus reduces the overall power consumption of the motor, and significantly optimizes the energy utilization efficiency of the motor.

[0065] Furthermore, the present application highly integrates the motor and the driving circuit board 5, making the energy transfer path from the source to the terminal more direct and efficient, reducing the energy consumption in the intermediate links, and enabling the motor to more fully convert the input electrical energy into effective mechanical work output during actual operation, thereby increasing the motor's speed and torque, allowing the motor to operate more efficiently.

[0066] Specifically, α and β of this embodiment satisfy the following relationship: 0<|α-β|<20, which helps the user find the best balance between motor power and motor efficiency, so that the motor runs at a torque close to the maximum efficiency point, enables the motor to more efficiently utilize the input electrical energy, reduces energy waste, and helps reduce the energy consumption of the motor.

[0067] In one embodiment, α and β satisfy the following relationship: 0<|α-β|<15.

[0068] In one embodiment, the torque of the motor shaft 4 is between 0 and 50 mNm;

[0069] In one embodiment, the rotation speed of the motor shaft 4 is between 0 and 4000 rpm;

[0070] In one embodiment, the current of the motor is between 0.1 and 2.4 A;

[0071] In one embodiment, the power of the motor is between 0 and 8w;

[0072] In one embodiment, the efficiency of the motor is between 0% and 80%.

[0073] In one embodiment, Figure 2 The medium speed line is a line of changes in the speed of the motor shaft 4 and the torque of the motor shaft 4 . The change in the speed of the motor shaft 4 and the change in the torque of the motor shaft 4 are linearly negatively correlated, and the slope thereof is between -120 and -60.

[0074] In this embodiment, the rotation speed of the motor shaft 4 decreases slowly as the torque of the motor shaft 4 increases, so as to provide more response time for the motor, enable the motor to gradually adapt to the change of load, and help maintain the stable operation of the motor.

[0075] This embodiment makes the rotation speed of the motor shaft 4 decrease slowly as the torque of the motor shaft 4 increases, avoiding the sharp increase of mechanical stress and thermal stress inside the motor when the torque of the motor shaft 4 increases, which helps to reduce the wear of the motor and delay the aging of the motor, thereby extending the service life of the motor. In addition, the rotation speed of the motor shaft 4 decreases slowly as the torque of the motor shaft 4 increases, which can also reduce the vibration and noise of the motor and improve the overall performance of the motor.

[0076] In one embodiment, the change in the rotation speed of the motor shaft 4 is linearly negatively correlated with the change in the torque of the motor shaft 4 , and the slope thereof is between -105 and -75.

[0077] In one embodiment, the change in the rotation speed of the motor shaft 4 is linearly negatively correlated with the change in the torque of the motor shaft 4 , and the slope thereof is between -95 and -85.

[0078] In one embodiment, Figure 2 The middle current line is a line of change of the current of the motor shaft 4 and the torque of the motor shaft 4 . The change of the current of the motor is linearly positively correlated with the change of the torque of the motor shaft 4 , and the slope thereof is between 0.04 and -0.07.

[0079] This embodiment allows the current of the motor to increase slowly when the torque of the motor shaft 4 increases, so that the motor can adjust its output power more smoothly to adapt to changes in the load, avoiding excessive no-load loss or overload loss of the motor when the load suddenly increases, helping to reduce energy waste, further improving the operating efficiency of the motor, and maintaining high energy efficiency under various load conditions. In addition, the current increases slowly with the torque, so that the motor has more time to dissipate heat and adapt to changes in the load, avoiding damage to the motor due to overheating or excessive mechanical stress, and extending the service life of the motor.

[0080] In one embodiment, the change in the current of the motor is linearly positively correlated with the change in the torque of the motor shaft 4 , and the slope thereof is between 0.045 and −0.06.

[0081] In one embodiment, the change in the current of the motor is linearly positively correlated with the change in the torque of the motor shaft 4 , and the slope thereof is between 0.05 and −0.055.

[0082] In one embodiment, Figure 2 As shown by the Power line in the middle, the power of the motor changes with the torque of the motor shaft 4, showing a parabola or a quasi-parabola change.

[0083] like Figure 4 As shown, in one embodiment, the stator assembly 2 and the rotor assembly 3 are separated so that a first air flow channel 13 is formed between the stator assembly 2 and the rotor assembly 3;

[0084] In a plane perpendicular to the axis of the housing 1 , the cross section of the first air flow channel 13 is annular or quasi-annular.

[0085] This embodiment provides an annular or quasi-annular first airflow channel 13 to provide an effective heat dissipation path for the heat generated by the motor during operation, which helps to reduce the temperature of the motor and prevent overheating, thereby extending the service life of the motor. It also reduces the resistance of the airflow between the stator assembly 2 and the rotor assembly 3, making the gas flow more smoothly inside the motor, accelerating the heat dissipation efficiency of the motor, helping to reduce energy loss and improve the overall efficiency of the motor.

[0086] At the same time, the first annular or quasi-annular airflow channel 13 can balance the airflow pressure, reduce the impact of airflow disturbance on the stability of the motor, and help reduce the vibration and noise generated by the motor during operation. And when running at high speed, the first annular or quasi-annular airflow channel 13 can provide stable support and lubrication, reduce friction and wear, and thus improve the running accuracy and stability of the motor.

[0087] like Figure 5 As shown, in one embodiment, the stator assembly 2 includes a stator core 22 and a stator winding (not shown in the figure), and the inner wall of the stator core 22 is formed with a plurality of protrusions 221, and the plurality of protrusions 221 are arranged at intervals along the circumferential direction of the stator core 22;

[0088] The protruding column 221 includes a protruding portion 2211 and an extended portion 2212. The inner wall of the stator core 22 protrudes outward to form the protruding portion 2211 and the extended portion 2212 in sequence. The stator winding is arranged on the protruding portion 2211. The surface of the extended portion 2212 close to the rotor assembly 3 is an inwardly concave arc surface 22121.

[0089] In this embodiment, the stator core 22 is provided with the protruding column 221 to increase the mechanical strength of the stator core 22, making it more resistant to vibration and impact, thereby helping to reduce the vibration and noise generated during the operation of the motor and improving the running stability of the motor.

[0090] At the same time, the protruding column 221 allows the stator winding to be arranged more closely on the stator core 22, thereby optimizing the magnetic field distribution, helping to reduce magnetic leakage, improve the utilization rate of the magnetic field, and thus improve the efficiency and performance of the motor.

[0091] Moreover, the surface of the extension portion 2212 close to the rotor assembly 3 is an inwardly concave arc surface 22121, which helps to increase the heat dissipation area and improve the heat dissipation efficiency. It can also guide the airflow to flow through the stator assembly 2 more smoothly, reduce airflow resistance, and further reduce the temperature.

[0092] like Figure 5 As shown, in one embodiment, the rotor assembly 3 includes a rotor core 31 and a plurality of magnetic parts 32. The rotor core 31 has a hollow structure. The motor shaft 4 passes through the rotor core 31. The outer wall of the rotor core 31 is formed with receiving grooves 311 having the same number as the magnetic parts 32. The magnetic parts 32 are located in the receiving grooves 311, and a side surface of the magnetic parts 32 close to the stator assembly 2 is an arc surface 321 protruding outward.

[0093] In this embodiment, the side surface of the magnetic member 32 close to the stator assembly 2 is an outwardly convex arc surface 321, which helps to increase the heat dissipation area and improve the heat dissipation efficiency. It can also guide the airflow to contact the rotor assembly 3 more smoothly, reduce airflow resistance, and further reduce the temperature.

[0094] like Figure 6-Figure 7 As shown, in one embodiment, the driving circuit board 5 has a first surface 51 and a second surface 52, the distance between the first surface 51 and the linkage member 43 is smaller than the distance between the second surface 52 and the linkage member 43, the detection member 511 is arranged on the first surface 51, and the driving chip 521 is arranged on the second surface 52.

[0095] This embodiment ensures that the driving chip 521 and the detection component 511 can be installed on a miniaturized board by reasonably planning the installation positions of the driving chip 521 and the detection component 511; at the same time, the driving chip 521 and the detection component 511 are respectively arranged on two surfaces of the driving circuit board 5, avoiding heat accumulation on the same surface of the driving circuit board 5, which helps to disperse the heat and improve the heat dissipation efficiency.

[0096] In this embodiment, the detection member 511 is arranged on the first surface 51 of the driving circuit board 5 which is closer to the linkage member 43, so that the detection member 511 is close to the motion device, which helps to reduce the measurement error and improve the detection accuracy. At the same time, the driving chip 521 is arranged on the second surface 52 of the driving circuit board 5 which is farther from the linkage member 43, so that the driving chip 521 is away from the linkage member 43 and the stator assembly 2, the rotor assembly 3 and other structures, so as to avoid the heat generated by the stator assembly 2 and the rotor assembly 3 from spreading to the driving chip 521, thereby causing the driving chip 521 to be overheated and damaged, thereby improving the service life of the motor.

[0097] like Figure 1-Figure 9 As shown, in one embodiment, a second air flow channel 53 and a third air flow channel 54 are formed between the driving circuit board 5 and the inner wall of the casing 1, and the second air flow channel 53 and the third air flow channel 54 are respectively arranged on both sides of the driving circuit board 5, and the second air flow channel 53 and the third air flow channel 54 are both used to connect the inner cavity of the casing 1 with the outside.

[0098] In this embodiment, the second air flow channel 53 and the third air flow channel 54 are respectively arranged on both sides of the driving circuit board 5, which promotes air convection between the inner cavity of the casing 1 and the outside, helps to transfer and dissipate heat, and thus reduces the operating temperature of the inner cavity of the casing 1 and the driving circuit board 5; and the second air flow channel 53 and the third air flow channel 54 are respectively arranged on both sides of the driving circuit board 5, which helps to enhance convection, can take away heat through the disturbance of air flow, and avoid local heat accumulation.

[0099] like Figure 1-Figure 9 As shown, in one embodiment, an electronic component 512 is further disposed on the first surface 51, and the electronic component 512 is adjacent to the second air flow channel 53; an input-output module 522 is further disposed on the second surface 52, the input-output module 522 is adjacent to the third air flow channel 54, and the wires of the input-output module 522 pass through the third air flow channel 54 and are electrically connected to the stator winding.

[0100] In this embodiment, the electronic component 512 and the input-output module 522 are respectively arranged near the second airflow channel 53 and the third airflow channel 54, so as to avoid the heat of the electronic component 512 and the input-output module 522 from accumulating near the second airflow channel 53 or the third airflow channel 54, thereby reducing the heat dissipation pressure of the second airflow channel 53 or the third airflow channel 54, thereby accelerating the heat dissipation speed and further improving the heat dissipation efficiency. In addition, the third airflow channel 54 provides a fast channel for the wire to be electrically connected to the stator winding, which helps to reduce the overall volume of the motor.

[0101] like Figure 1-Figure 10 As shown, the present application also provides an electric toothbrush, comprising a housing 6, a main control circuit board 7, a brush head (not shown in the figure) and the motor described in any of the above embodiments;

[0102] The main control circuit board 7 and the motor are arranged on the housing 6, the first end 41 of the motor shaft extends out of the housing 6, and the brush head is arranged at the first end 41 of the motor shaft. The main control circuit board 7 is used to output a control signal to the driving chip 521, and the driving chip 521 is used to drive the rotor assembly 3 to drive the motor shaft 4, the linkage 43 and the brush head to rotate relative to the stator assembly 2 based on the received control signal.

[0103] The present application achieves self-driving capability by highly integrating the motor and the driving circuit board 5, abandons the traditional mode of using the main control circuit board 7 as an intermediary to drive the motor, simplifies the motor driving architecture, and greatly reduces the cumbersome signal transmission process and energy conversion steps between the main control circuit board 7 and the motor, thereby achieving instant connection between the control signal and the motor action, minimizing the loss and interference of the control signal during the transmission process, thereby greatly improving the control accuracy of the motor.

[0104] Moreover, in the traditional driving mode, the control signal needs to be processed by the main control circuit board 7 at multiple levels, and then transmitted to the motor driving circuit through the connecting cable. During this period, the control signal is easily interfered with, resulting in quality degradation, and there will be a large loss of electric energy during multiple conversions. Since the present application highly integrates the motor and the driving circuit board 5, giving the motor self-driving capability, it curbs the energy loss caused by multiple conversions and transmissions at the source, avoids unnecessary energy loss, and thus reduces the overall power consumption of the motor, and significantly optimizes the energy utilization efficiency of the motor.

[0105] Furthermore, the present application highly integrates the motor and the driving circuit board 5, making the energy transfer path from the source to the terminal more direct and efficient, reducing the energy consumption in the intermediate links, and enabling the motor to more fully convert the input electrical energy into effective mechanical work output during actual operation, thereby increasing the motor's speed and torque, allowing the motor to operate more efficiently.

[0106] Furthermore, the present application separates the driving circuit from the main control circuit board 7, and integrates the driving circuit board 5 where the driving circuit is located with the motor, so that the main control circuit board 7 is responsible for the control and instruction execution of the entire electric toothbrush, and the driving circuit board 5 is responsible for converting the control signal output by the main control circuit into a current, voltage or power suitable for the operation of the motor. This avoids the high-frequency signal in the driving circuit from interfering with the main control circuit and other sensitive circuits, and further improves the overall stability of the motor.

[0107] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

[0108] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An electric toothbrush, characterized in that: It comprises a housing, a main control circuit board, a brush head and a motor; the main control circuit board and the motor are arranged on the housing; The motor comprises a housing, a stator assembly, a rotor assembly, a motor shaft and a driving circuit board, wherein the stator assembly is located in the housing, the rotor assembly is located in the stator assembly and is arranged on the motor shaft, and the stator assembly, the rotor assembly and the motor shaft all extend from a first end of the housing to a second end of the housing; Wherein, the first end of the motor shaft extends out of the first end of the housing and the housing, the brush head is arranged at the first end of the motor shaft, the second end of the motor shaft is provided with a linkage member, the driving circuit board is arranged at the second end of the housing, the driving circuit board is provided with a driving chip and a detection member, the main control circuit board is used to output a control signal to the driving chip, the driving chip is used to drive the rotor assembly to drive the motor shaft and the linkage member to rotate relative to the stator assembly based on the received control signal, and the detection member is used to detect the state of the linkage member and feed back to the driving chip; The power of the motor changes with the torque of the motor shaft, first increasing and then decreasing; the power of the motor changes with the torque of the motor shaft, and changes in a parabola or a quasi-parabola; the efficiency of the motor changes with the torque of the motor shaft, and first increasing and then decreasing; when the motor is at maximum power, the torque of the motor shaft is α; when the motor is at maximum efficiency, the torque of the motor shaft is β; α and β satisfy the following relationship: 0<|α-β|<20; Wherein, the torque of the motor shaft is between 0~50mNm; and / or, the rotation speed of the motor shaft is between 0~4000rpm; and / or, the current of the motor is between 0.1~2.4A; and / or, the power of the motor is between 0~8w; and / or, the efficiency of the motor is between 0~80%.

2. The electric toothbrush according to claim 1, characterized in that: The change in the rotation speed of the motor shaft is linearly negatively correlated with the change in the torque of the motor shaft, and the slope thereof is between -120 and -60.

3. The electric toothbrush according to claim 1, characterized in that: The current change of the motor is linearly positively correlated with the torque change of the motor shaft, and the slope thereof is between 0.04 and -0.

07.

4. The electric toothbrush according to claim 1, characterized in that: The stator assembly and the rotor assembly are separated so that a first airflow channel is formed between the stator assembly and the rotor assembly; In a plane perpendicular to the axis of the housing, a cross section of the first airflow channel is annular or quasi-annular.

5. The electric toothbrush according to claim 4, characterized in that: The stator assembly includes a stator core and a stator winding, wherein a plurality of protrusions are formed on the inner wall of the stator core, and the plurality of protrusions are arranged at intervals along the circumference of the stator core; The protruding column includes a protruding portion and an extended portion. The inner wall of the stator core protrudes outward to form the protruding portion and the extended portion in sequence. The stator winding is arranged on the protruding portion. The surface of the extended portion close to the rotor assembly is an inwardly concave arc surface.

6. The electric toothbrush according to claim 4, characterized in that: The rotor assembly includes a rotor core and a plurality of magnetic parts. The rotor core has a hollow structure. The motor shaft passes through the rotor core. The outer wall of the rotor core is formed with accommodating grooves whose number is the same as that of the magnetic parts. The magnetic parts are located in the accommodating grooves, and a side surface of the magnetic parts close to the stator assembly is an arc-shaped surface protruding outward.

7. The electric toothbrush according to claim 1, characterized in that: The driving circuit board has a first surface and a second surface, the distance between the first surface and the linkage member is smaller than the distance between the second surface and the linkage member, the detection member is arranged on the first surface, and the driving chip is arranged on the second surface.

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