Motor shaft displacement detection device, motor control system and method, electric toothbrush

Abstract

This application is applicable to the field of detection technology, and provides a motor shaft displacement detection device, a motor control system and method, and an electric toothbrush. The above-mentioned motor shaft displacement detection device includes a magnetic field generation and induction module and a signal processing module. When the motor shaft is squeezed and undergoes displacement deformation, the third magnetic field generated by the motor shaft changes. The change in the third magnetic field affects the change in the second magnetic field at the position where the magnetic field generation and induction module is located. The magnetic field generation and induction module senses the change in the second magnetic field to generate an analog signal, and transmits the analog signal to the signal processing module. The signal processing module converts the analog signal into a digital signal and outputs the digital signal. The main controller identifies the deformation displacement condition of the motor shaft according to the digital signal, adaptively adjusts the output control signal, and the motor changes the vibration frequency according to the adjusted control signal. In this way, the motor of the electric toothbrush adjusts the vibration frequency according to the current brushing strength, enhancing the user experience.

Description

Technical Field

[0001] This application belongs to the field of detection technology, and particularly relates to a motor shaft displacement detection device, a motor control system and method, and an electric toothbrush. Background Art

[0002] The control system of traditional electric toothbrushes mainly includes a main controller, a motor driver, a motor, and a battery module. The battery module is used to supply electrical energy to the main controller and the motor driver. The main controller is used to generate a PWM (pulse width modulation) control signal and send it to the motor driver. The motor driver drives the motor according to the PWM control signal, thereby achieving a cleaning effect.

[0003] The control system of traditional electric toothbrushes belongs to open-loop control. When the electric toothbrush is working, it cannot adjust the vibration frequency of the motor in real time according to the brushing force, resulting in low intelligence and affecting the user experience. Summary of the Invention

[0004] Embodiments of this application provide a motor shaft displacement detection device, a motor control system and method, and an electric toothbrush, which can solve the problem that traditional electric toothbrushes cannot adjust the motor vibration frequency according to the brushing force.

[0005] In a first aspect, embodiments of this application provide a motor shaft displacement detection device, including a magnetic field generation and induction module and a signal processing module. The signal output end of the magnetic field generation and induction module is electrically connected to the input end of the signal processing module;

[0006] The magnetic field generation and induction module is used to generate a first magnetic field at the position where the motor shaft is located. The first magnetic field is used to excite the motor shaft to generate a third magnetic field. The magnetic field generation and induction module is also used to sense a second magnetic field, where the second magnetic field is a magnetic field formed by the interaction of the first magnetic field and the third magnetic field. The magnetic field generation and induction module is also used to generate an analog signal according to the second magnetic field and transmit the analog signal to the signal processing module. The signal processing module is used to convert the analog signal into a digital signal, and the digital signal is used to obtain the distance information between the motor shaft and the magnetic field generation and induction module.

[0007] In a possible implementation manner of the first aspect, the magnetic field generation and induction module includes a first capacitor, a first inductor, a first resistor, and a second resistor;

[0008] The first end of the first resistor and the first end of the second resistor are respectively electrically connected to two electrode ends of a first power supply. The second end of the first resistor is respectively electrically connected to the second end of the second resistor, the first end of the first capacitor, and the first end of the first inductor. The second end of the first capacitor and the second end of the first inductor are both electrically connected to the input end of the signal processing module.

[0009] In a possible implementation manner of the first aspect, the signal processing module includes an analog-to-digital converter;

[0010] The input end of the analog-to-digital converter is electrically connected to the signal output end of the magnetic field generation and induction module;

[0011] The analog-to-digital converter is used to convert the analog signal into the digital signal.

[0012] In a possible implementation manner of the first aspect, the signal processing module further includes an amplifier;

[0013] The input end of the amplifier is electrically connected to the signal output end of the magnetic field generation and induction module, and the output end of the amplifier is electrically connected to the input end of the analog-to-digital converter;

[0014] The amplifier is used to perform amplification processing on the analog signal and transmit the amplified analog signal to the analog-to-digital converter.

[0015] In a second aspect, an embodiment of the present application provides a motor control system, including a main controller, a motor, and the motor shaft displacement detection device according to any one of the first aspect;

[0016] The input end of the main controller is electrically connected to the output end of the motor shaft displacement detection device, and the output end of the main controller is electrically connected to the motor;

[0017] The motor shaft displacement detection device is used to detect the position of the motor shaft, generate a corresponding digital signal according to the position of the motor shaft, and transmit the digital signal to the main controller; the main controller is used to generate a control signal according to the digital signal and control the vibration frequency of the motor according to the control signal.

[0018] In a possible implementation manner of the second aspect, the motor control system further includes a battery module;

[0019] The battery module is electrically connected to the main controller and is used to supply electrical energy to the main controller.

[0020] In a possible implementation manner of the second aspect, the motor control system further includes a motor driver;

[0021] The input end of the motor driver is electrically connected to the output end of the main controller, and the output end of the motor driver is electrically connected to the motor;

[0022] The motor driver is configured to control the vibration frequency of the motor according to the control signal.

[0023] In a third aspect, an embodiment of the present application provides a motor control method, which is applied to the motor control system according to any one of the first aspects. The method includes:

[0024] Obtain a digital signal; wherein, the digital signal is generated by a motor shaft displacement detection device by detecting the position of the motor shaft;

[0025] Calculate the real-time frequency of the digital signal, and generate a control signal according to the real-time frequency and a preset frequency;

[0026] Output the control signal; wherein, the control signal is used to control the vibration frequency of the motor.

[0027] In a possible implementation manner of the third aspect, the preset frequency includes a first preset frequency and a second preset frequency, and the first preset frequency is less than the second preset frequency; the control signal includes a first control signal, a second control signal, and a third control signal;

[0028] The generating the control signal according to the real-time frequency and the preset frequency includes:

[0029] Compare the real-time frequency with the first preset frequency and the second preset frequency respectively;

[0030] When the real-time frequency is less than the first preset frequency, generate the first control signal; wherein, the motor driver is configured to control the motor to increase the vibration frequency according to the first control signal;

[0031] When the real-time frequency is greater than the first preset frequency and less than the second preset frequency, generate the second control signal; wherein, the motor driver is configured to control the motor to maintain the current vibration frequency according to the second control signal;

[0032] When the real-time frequency is greater than the second preset frequency, generate the third control signal; wherein, the motor driver is configured to control the motor to decrease the vibration frequency according to the third control signal.

[0033] In a fourth aspect, an embodiment of the present application provides an electric toothbrush, which includes the motor control system according to any one of the second aspects.

[0034] In a possible implementation manner of the fourth aspect, the electric toothbrush further includes a brush head and a handle;

[0035] The main controller, the motor, and the motor shaft displacement detection device are all installed in the inner cavity of the handle; the motor shaft displacement detection device corresponds to the position of the motor shaft of the motor, so that the motor shaft displacement detection device can generate a first magnetic field at the position where the motor shaft is located; the motor is used to drive the brush head to vibrate through the motor shaft.

[0036] In a possible implementation manner of the fourth aspect, the motor shaft displacement detection device is electrically connected to the main controller through a flexible circuit board.

[0037] The beneficial effects of the embodiments of the present application compared with the prior art are as follows:

[0038] When the user uses the electric toothbrush, the motor shaft is squeezed and deformed, the distance between the motor shaft and the magnetic field and the induction module changes, and the third magnetic field generated by the motor shaft changes. The change of the third magnetic field affects the change of the second magnetic field at the position where the magnetic field generation and induction module is located. The magnetic field generation and induction module senses the change of the second magnetic field to generate an analog signal and transmits the analog signal to the signal processing module. The signal processing module converts the analog signal into a digital signal and outputs the digital signal. The main controller can identify the deformation displacement of the motor shaft according to the digital signal and adaptively adjust the output control signal, and the motor changes the vibration frequency according to the adjusted control signal. In this way, the motor of the electric toothbrush adjusts the vibration frequency according to the current brushing force to meet the current needs of the user, thereby improving the intelligence of the electric toothbrush and enhancing the user experience. Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only 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.

[0040] Figure 1 is a principle block diagram of a motor shaft displacement detection device provided by an embodiment of the present application;

[0041] Figure 2 is a circuit connection schematic diagram of a motor shaft displacement detection device provided by an embodiment of the present application;

[0042] Figure 3 is a principle block diagram of a motor control system provided by an embodiment of the present application;

[0043] Figure 4 is a principle block diagram of a motor control system provided by another embodiment of the present application;

[0044] Figure 5 is a schematic flowchart of a motor control method provided by an embodiment of the present application;

[0045] Figure 6 is a schematic structural diagram of an electric toothbrush provided by an embodiment of the present application. Detailed implementation manners

[0046] In the following description, specific details such as specific system architectures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0047] It should be understood that when used in the specification of the present application and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0048] It should also be understood that the term "and / or" as used in the specification of the present application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0049] As used in the specification of the present application and the appended claims, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" depending on the context. Similarly, the phrase "if determined" or "if detected [the described condition or event]" can be interpreted as meaning "once determined", "in response to determining", "once detected [the described condition or event]", or "in response to detecting [the described condition or event]" depending on the context.

[0050] In addition, in the description of the specification of the present application and the appended claims, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0051] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that specific features, structures, or characteristics described in connection with that embodiment are included in one or more embodiments of this application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized.

[0052] Figure 1 The principle block diagram of the motor shaft displacement detection device provided by an embodiment of this application is shown. Refer to Figure 1 As shown, the motor shaft displacement detection device 100 may include a magnetic field generation and induction module 101 and a signal processing module 102.

[0053] Among them, the power supply terminal of the magnetic field generation and induction module 101 is used to be electrically connected to the first power supply 200, and the signal output terminal of the magnetic field generation and induction module 101 is electrically connected to the input terminal of the signal processing module 102. The output terminal of the signal processing module 102 is used to be electrically connected to the main controller 300.

[0054] Specifically, the first power supply 200 provides electrical energy for the magnetic field generation and induction module 101, so that the magnetic field generation and induction module 101 generates a first magnetic field at the position where the motor shaft is located. According to the principle of electromagnetic induction, eddy currents are generated in the metal motor shaft under the action of the first magnetic field, and the eddy currents generated by the motor shaft will generate a third magnetic field at the position where the magnetic field generation and induction module 101 is located. There are both the first magnetic field and the third magnetic field at the position where the magnetic field generation and induction module 101 is located, and the second magnetic field induced by the magnetic field generation and induction module 101 is the magnetic field formed by the interaction of the first magnetic field and the third magnetic field.

[0055] When the motor shaft does not undergo displacement deformation, the distance between the magnetic field generation and induction module 101 and the motor shaft remains unchanged. At this time, neither the first magnetic field nor the third magnetic field will change, and the second magnetic field induced by the magnetic field generation and induction module 101 will not change either.

[0056] When the motor shaft undergoes displacement deformation, the distance between the magnetic field generation and induction module 101 and the motor shaft changes, the magnetic field intensity of the first magnetic field at the position where the motor shaft is located changes accordingly, the eddy currents generated by the motor shaft change, and further the magnetic field intensity of the third magnetic field generated by the motor shaft changes. At this time, the magnetic field intensity of the second magnetic field at the position where the magnetic field generation and induction module 101 is located changes.

[0057] As can be seen from the above, when the motor shaft undergoes displacement deformation, the magnetic field and the magnetic field intensity of the second magnetic field induced by the induction module 101 will change, and the analog signal generated by the magnetic field and the induction module 101 according to the second magnetic field will also change. Furthermore, the digital signal generated by the signal processing module 102 will also change accordingly. Therefore, the distance information between the magnetic field generation and induction module 101 and the motor shaft can be obtained by identifying the change of the digital signal.

[0058] When the main controller 300 receives the digital signal, the displacement deformation condition of the motor shaft can be known through the analysis of the main controller 300, and the output control signal can be adjusted according to the displacement deformation condition of the motor shaft (adjust the duty cycle or frequency of the PWM control signal), so as to adjust the vibration frequency of the motor. In this way, the motor of the electric toothbrush can adjust the vibration frequency according to the current brushing force to meet the current needs of the user, improve the intelligence of the electric toothbrush, and enhance the user experience.

[0059] When the motor shaft displacement detection device 100 provided by the embodiment of the present application detects the displacement deformation of the motor shaft, it does not need to be in contact with the motor shaft, realizes non-contact acquisition, is not affected by the vibration of the motor, and can always maintain high-precision detection, with the characteristics of stable performance. When installing the motor shaft displacement detection device 100, it is not necessary to groove the motor shaft, which can ensure the integrity of the motor shaft and thus improve the reliability of the product.

[0060] It should be noted that the first power supply 200 can select an independent power supply to supply power to the magnetic field generation and induction module 101, or the power supply led out from the signal processing module 102 can be used to supply power to the magnetic field generation and induction module 101.

[0061] Exemplarily, the magnetic field generation and induction module 101 can generate a voltage analog signal according to the second magnetic field, and the signal processing module 102 converts the voltage analog signal into a square wave signal (digital signal).

[0062] When the user uses the toothbrush, the motor shaft is squeezed and displaced, and the distance between the motor shaft and the magnetic field and the induction module 101 changes, causing the second magnetic field at the position where the magnetic field and the induction module 101 are located to change. The magnetic field generation and induction module 101 senses the changed second magnetic field to generate a voltage analog signal and transmits the voltage analog signal to the signal processing module 102. The signal processing module 102 converts the voltage analog signal into a square wave signal and then transmits the square wave signal to the main controller 300. The main controller 300 can judge the displacement deformation condition of the motor shaft by identifying the frequency of the square wave signal, and adjust the output control signal according to the displacement deformation condition of the motor shaft (adjust the duty cycle or frequency of the PWM control signal) to adjust the vibration frequency of the motor. In this way, the motor of the electric toothbrush adjusts the vibration frequency according to the current brushing force, meets the current needs of the user, improves the intelligence of the electric toothbrush, and enhances the user experience.

[0063] Figure 2 FIG. shows a schematic circuit connection diagram of the motor shaft displacement detection device 100 provided in an embodiment of the present application. Refer to Figure 2 As shown, the first power supply 200 is two power supply terminals led out from the signal processing module 102, and the magnetic field generation and induction module 101 may include a first capacitor C1, a first inductor L1, a first resistor R1, and a second resistor R2.

[0064] Among them, the first end of the first resistor R1 and the first end of the second resistor R2 are respectively electrically connected to the two electrode terminals (CRX0 and CRX5) of the first power supply 200, and the second end of the first resistor R1 is respectively electrically connected to the second end of the second resistor R2, the first end of the first capacitor C1, and the first end of the first inductor L1. The second end of the first capacitor C1 and the second end of the first inductor L1 are both electrically connected to the input terminal (CRX1) of the signal processing module 102.

[0065] Specifically, the first capacitor C1 and the first inductor L1 form an LC oscillation circuit, and the first power supply 200 supplies power to the LC oscillation circuit through the first resistor R1 and the second resistor R2. When the LC oscillation circuit works, the first inductor L1 generates a first magnetic field at the position of the motor shaft. Under the action of the first magnetic field, eddy currents are generated on the motor shaft, and under the action of the eddy currents, the motor shaft itself generates a third magnetic field.

[0066] When the distance between the motor shaft and the first inductor L1 changes, it will cause the first magnetic field and the third magnetic field to change, and then cause the magnetic field intensity of the second magnetic field at the position where the first inductor L1 is located and the magnetic flux of the first inductor L1 to change, and finally cause the inductance value of the first inductor L1 to change. According to the formula (where f is the oscillation frequency, L is the inductance value of the first inductor L1, and C is the capacitance value of the first capacitor C1), it can be known that a change in the inductance value of the first inductor L1 causes a change in the oscillation frequency of the LC oscillation circuit, that is, a change in the frequency of the analog signal output from the second end of the first inductor L1. Thus, it can be seen that the frequency of the analog signal can characterize the distance information between the motor shaft and the first inductor L1, that is, by analyzing the frequency of the analog signal, the displacement deformation of the motor shaft can be known. In this way, the magnetic field generation and induction module 101 realizes the detection of the displacement deformation of the motor shaft.

[0067] As Figure 2 shown, the magnetic field generation and induction module 101 may further include a second capacitor C2. The first end of the second capacitor C2 is grounded, and the second end of the second capacitor C2 is electrically connected to the input end of the signal processing module 102.

[0068] Specifically, the second capacitor C2 plays a filtering role and can filter out the impurity signals in the analog signal to improve the accuracy of the analog signal.

[0069] As Figure 2 shown, the signal processing module 102 may include an analog-to-digital converter U1. The input end of the analog-to-digital converter U1 is electrically connected to the signal output end of the magnetic field generation and induction module 101, and the output end of the analog-to-digital converter U1 is used to be electrically connected to the main controller 300.

[0070] Specifically, since the magnetic field generation and induction module 101 outputs an analog signal, the analog-to-digital converter U1 converts the analog signal into a digital signal, and the frequency of the converted digital signal is the same as the frequency of the analog signal. Then the analog-to-digital converter U1 can transmit the generated digital signal to the main controller 300. The main controller 300 can identify the frequency of the digital signal and then judge whether the motor shaft has displacement deformation. When the main controller 300 identifies that the frequency of the digital signal changes, it means that the motor shaft has displacement deformation at this time. At this time, the main controller 300 adjusts the control signal according to the frequency of the data signal (changing the duty cycle or frequency of the control signal) to adjust the vibration frequency of the motor. In this way, the motor of the electric toothbrush adjusts the vibration frequency according to the current brushing force to meet the current needs of the user, improve the intelligence of the electric toothbrush, and enhance the user experience.

[0071] In an embodiment of the present application, the signal processing module 102 may further include an amplifier. The input end of the amplifier is electrically connected to the signal output end of the magnetic field generation and induction module 101, and the output end of the amplifier is electrically connected to the input end of the analog-to-digital converter U1.

[0072] Specifically, the analog signal output by the magnetic field generation and induction module 101 is weak. The amplifier amplifies the analog signal according to a set ratio so that the analog-to-digital converter U1 can receive a clear analog signal and accurately convert the analog signal into a digital signal.

[0073] It should be noted that the amplifier and the analog-to-digital converter U1 can be integrated into a chip with amplification and analog-to-digital conversion functions, or the amplifier and the analog-to-digital converter U1 can be set as two independent circuits or chips.

[0074] Figure 3 The principle block diagram of the motor control system provided by an embodiment of the present application is shown. Refer to Figure 3 As shown, the motor control system may include a main controller 300, a motor 500, and the motor shaft displacement detection device 100 described above.

[0075] Wherein, the input end of the main controller 300 is electrically connected to the output end of the motor shaft displacement detection device 100, and the output end of the main controller 300 is electrically connected to the motor 500.

[0076] Specifically, the motor shaft displacement detection device 100 generates a corresponding digital signal according to the position of the motor shaft and transmits the digital signal to the main controller 300. The main controller 300 generates a control signal according to the digital signal and controls the vibration frequency of the motor 500 according to the control signal.

[0077] When the motor shaft undergoes displacement deformation, the frequency of the digital signal output by the motor shaft displacement detection device 100 changes. After the main controller 300 recognizes the change in the digital signal frequency, it adjusts the control signal (changes the duty cycle or frequency of the control signal) and adjusts the vibration frequency of the motor 500 according to the adjusted control signal. In this way, the motor of the electric toothbrush adjusts the vibration frequency according to the current brushing strength to meet the current needs of the user, improve intelligence, and enhance the user experience.

[0078] Figure 4 The principle block diagram of the motor control system provided by another embodiment of the present application is shown. Refer to Figure 4 As shown, the motor control system may further include a battery module 600, and the battery module 600 is electrically connected to the main controller 300.

[0079] Specifically, the battery module 600 is used to supply electrical energy to the main controller 300.

[0080] Exemplarily, the battery module 600 may include a storage battery, a power supply circuit, and an indicator light. The power supply circuit is electrically connected to the storage battery, the indicator light, and the main controller 300 respectively.

[0081] Specifically, when the electric toothbrush needs to be charged, the power supply circuit is electrically connected to an external power supply, and the power supply circuit controls the energy storage battery to be charged. When the user uses the electric toothbrush, the power supply circuit controls the energy storage battery to discharge and supply power to the main controller 300. The indicator light can be lit or extinguished according to the working state of the power supply circuit, playing an indicating role so that the user can master the working state of the electric toothbrush.

[0082] As Figure 4 shown, the motor control system may further include a motor driver 400. The input end of the motor driver 400 is electrically connected to the output end of the main controller 300, and the output end of the motor driver 400 is electrically connected to the motor 500.

[0083] Specifically, the motor driver 400 receives the control signal sent by the main controller 300, adjusts the output parameters (current, voltage) according to the control signal, and drives the motor 500 to change the vibration frequency.

[0084] Figure 5 shows a schematic flowchart of a motor control method provided by an embodiment of the present application. Refer to Figure 5 shown, the motor control method may include steps S501 to S503.

[0085] Step S501, obtain a digital signal, where the digital signal is generated by the motor shaft displacement detection device 100 by detecting the position of the motor shaft.

[0086] Specifically, when the electric toothbrush is working, the motor shaft displacement detection device 100 can detect the displacement deformation of the motor shaft and output a digital signal according to the position of the motor shaft. When the position of the motor shaft does not change, the frequency of the digital signal output by the motor shaft displacement detection device 100 remains unchanged; when the position of the motor shaft undergoes displacement deformation, the frequency of the digital signal output by the motor shaft displacement detection device 100 changes. The main controller 300 can judge the displacement deformation situation of the motor shaft by identifying the frequency of the digital signal.

[0087] Step S502, calculate the real-time frequency of the digital signal, and generate a control signal according to the real-time frequency and the preset frequency.

[0088] Specifically, when the main controller 300 receives the digital signal, it first identifies the real-time frequency of the digital signal, and then generates a control signal according to the real-time frequency and the preset frequency.

[0089] Exemplarily, the preset frequency may include a first preset frequency and a second preset frequency, the first preset frequency is less than the second preset frequency, and the control signal may include a first control signal, a second control signal, and a third control signal. Step S502 may specifically include steps S5021 to S5024.

[0090] Step S5021, compare the real-time frequency with the first preset frequency and the second preset frequency respectively.

[0091] Step S5022, when the real-time frequency is less than the first preset frequency, generate a first control signal; wherein, the motor driver 400 is used to control the motor 500 to increase the vibration frequency according to the first control signal.

[0092] Specifically, when the real-time frequency is less than the first preset frequency, it indicates that the user presses the electric toothbrush with a greater force at this time, and the contact force between the brush head of the electric toothbrush and the teeth is greater. At this time, the main controller 300 generates a first control signal (increasing the duty cycle or frequency of the control signal), and transmits the first control signal to the motor driver 400. The motor driver 400 drives the motor 500 to increase the vibration frequency according to the first control signal. At this time, the brush head of the electric toothbrush can vibrate smoothly on the tooth surface to ensure that the user can brush teeth normally.

[0093] Step S5023, when the real-time frequency is greater than the first preset frequency and less than the second preset frequency, generate a second control signal, wherein the motor driver 400 is used to control the motor 500 to maintain the current vibration frequency according to the second control signal.

[0094] Specifically, when the real-time frequency is greater than the first preset frequency and less than the second preset frequency, it indicates that the user presses the electric toothbrush with a moderate force at this time, and the contact force between the brush head of the electric toothbrush and the teeth is moderate. At this time, the main controller 300 generates a second control signal (maintaining the duty cycle or frequency of the control signal), and transmits the second control signal to the motor driver 400. The motor driver 400 drives the motor 500 to maintain the current vibration frequency according to the second control signal to ensure that the user can brush teeth normally.

[0095] Step S5024, when the real-time frequency is greater than the second preset frequency, generate a third control signal, wherein the motor driver 400 is used to control the motor 500 to decrease the vibration frequency according to the third control signal.

[0096] Specifically, when the real-time frequency is greater than the second preset frequency, it indicates that the user presses the electric toothbrush with a smaller force at this time, and the contact force between the brush head of the electric toothbrush and the teeth is smaller. At this time, the main controller 300 generates a third control signal (decreasing the duty cycle or frequency of the control signal), and transmits the third control signal to the motor driver 400. The motor driver 400 drives the motor 500 to decrease the vibration frequency according to the third control signal. At this time, the brush head of the electric toothbrush can vibrate smoothly on the tooth surface to ensure that the user can brush teeth normally.

[0097] Step S503, output a control signal, wherein the control signal is used to control the vibration frequency of the motor.

[0098] Specifically, after the main controller 300 determines the control signal, it transmits the control signal to the motor driver 400. The motor driver 400 controls the vibration frequency of the motor 500 according to the control signal, thereby realizing the adjustment of the vibration frequency of the motor 500. In this way, the motor of the electric toothbrush adjusts the vibration frequency according to the current brushing strength, meeting the current needs of the user and enhancing the user experience.

[0099] Figure 6 The schematic structural diagram of an electric toothbrush provided by an embodiment of the present application is shown. Refer to Figure 6 As shown, the electric toothbrush may include the above-mentioned motor control system.

[0100] Specifically, the motor shaft displacement detection device 100 generates a corresponding digital signal according to the position of the motor shaft 510 and transmits the digital signal to the main controller 300. The main controller 300 generates a control signal according to the digital signal and controls the vibration frequency of the motor 500 according to the control signal.

[0101] When using the electric toothbrush, when the motor shaft 510 undergoes displacement deformation, the frequency of the digital signal output by the motor shaft displacement detection device 100 changes. After the main controller 300 recognizes the change in the digital signal frequency, it adjusts the control signal (changing the duty cycle or frequency of the control signal) and adjusts the vibration frequency of the motor 500 according to the adjusted control signal. In this way, the motor of the electric toothbrush adjusts the vibration frequency according to the current brushing strength to meet the current needs of the user and enhance the user experience.

[0102] As Figure 6 shown, the electric toothbrush may further include a handle 900 and a brush head 800.

[0103] Among them, the main controller 300, the motor 500, and the motor shaft displacement detection device 100 are all installed in the inner cavity of the handle 900. The motor shaft displacement detection device 100 corresponds to the position of the motor shaft 510 so that the motor shaft displacement detection device 100 can generate a first magnetic field at the position where the motor shaft 510 is located. The motor 500 drives the brush head 800 to vibrate through the motor shaft 510.

[0104] Specifically, when using the electric toothbrush, when the brush head 800 contacts the teeth and is squeezed, the motor shaft 510 undergoes displacement deformation, and the frequency of the digital signal output by the motor shaft displacement detection device 100 changes. After the main controller 300 recognizes the change in the digital signal frequency, it adjusts the control signal (changing the duty cycle or frequency of the control signal) and adjusts the vibration frequency of the motor 500 according to the adjusted control signal. The change in the vibration frequency of the motor 500 in turn drives the vibration frequency of the brush head 800 to change in the same way, thereby meeting the current needs of the user for the vibration frequency of the brush head 800 and enhancing the user experience.

[0105] As Figure 6 shown, the electric toothbrush may further include a motor driver 400 installed in the inner cavity of the handle 900.

[0106] Among them, the input end of the motor driver 400 is electrically connected to the output end of the main controller 300, and the output end of the motor driver 400 is electrically connected to the motor 500.

[0107] Specifically, the motor driver 400 receives the control signal sent by the main controller 300, adjusts the output parameters (current, voltage) according to the control signal, and drives the motor 500 to change the vibration frequency.

[0108] It should be noted that in order to save space, the motor driver 400 and the main controller 300 can be integrated on the same control board.

[0109] As Figure 6 shown, the electric toothbrush may further include a battery module 600 installed in the inner cavity of the handle 900.

[0110] Among them, the battery module 600 is electrically connected to the main controller 300 and the motor driver 400. The battery module 600 is used to supply electrical energy to the main controller 300 and the motor driver 400.

[0111] In an embodiment of the present application, the motor shaft displacement detection device 100 is electrically connected to the main controller 300 through a flexible circuit board 700.

[0112] Specifically, multiple circuits can be integrated on a flexible circuit board 700, and stable communication can still be maintained in the case of folding and bending. Using the flexible circuit board 700 to connect the motor shaft displacement detection device 100 and the main controller 300 can ensure stable communication between the motor shaft displacement detection device 100 and the main controller 300, and also helps to reduce the installation difficulty during the production of the electric toothbrush.

[0113] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A motor shaft displacement detection device, characterized in that, It includes a magnetic field generation and induction module and a signal processing module. The signal output end of the magnetic field generation and induction module is electrically connected to the input end of the signal processing module; The magnetic field generation and induction module is used to generate a first magnetic field at the position where the motor shaft is located. The first magnetic field is used to excite the motor shaft to generate a third magnetic field. The magnetic field generation and induction module is also used to sense a second magnetic field, which is a magnetic field formed by the interaction between the first magnetic field and the third magnetic field. The magnetic field generation and induction module is further used to generate an analog signal according to the second magnetic field and transmit the analog signal to the signal processing module. The signal processing module is used to convert the analog signal into a digital signal, and the digital signal is used to obtain the distance information between the motor shaft and the magnetic field generation and induction module.

2. The motor shaft displacement detection device according to claim 1, characterized in that, The magnetic field generation and induction module includes a first capacitor, a first inductor, a first resistor and a second resistor; The first end of the first resistor and the first end of the second resistor are respectively electrically connected to two electrode ends of a first power supply. The second end of the first resistor is electrically connected to the second end of the second resistor, the first end of the first capacitor and the first end of the first inductor. The second end of the first capacitor and the second end of the first inductor are both electrically connected to the input end of the signal processing module.

3. The motor shaft displacement detection device according to claim 1 or 2, characterized in that, The signal processing module includes an analog-to-digital converter; The input end of the analog-to-digital converter is electrically connected to the signal output end of the magnetic field generation and induction module; The analog-to-digital converter is used to convert the analog signal into the digital signal.

4. The motor shaft displacement detection device according to claim 3, characterized in that, The signal processing module further includes an amplifier; The input end of the amplifier is electrically connected to the signal output end of the magnetic field generation and induction module, and the output end of the amplifier is electrically connected to the input end of the analog-to-digital converter; The amplifier is used to amplify the analog signal and transmit the amplified analog signal to the analog-to-digital converter.

5. A motor control system, characterized in that, It includes a main controller, a motor and the motor shaft displacement detection device according to any one of claims 1 to 4; The input end of the main controller is electrically connected to the output end of the motor shaft displacement detection device, and the output end of the main controller is electrically connected to the motor; The motor shaft displacement detection device is used to detect the position of the motor shaft, generate a corresponding digital signal according to the position of the motor shaft, and transmit the digital signal to the main controller. The main controller is used to generate a control signal according to the digital signal and control the vibration frequency of the motor according to the control signal.

6. The motor control system according to claim 5, characterized in that, The motor control system further includes a battery module; The battery module is electrically connected to the main controller and is used to supply electrical energy to the main controller.

7. The motor control system according to claim 5 or 6, characterized in that, The motor control system further includes a motor driver; The input end of the motor driver is electrically connected to the output end of the main controller, and the output end of the motor driver is electrically connected to the motor; The motor driver is used to control the vibration frequency of the motor according to the control signal.

8. A motor control method, applied to the motor control system according to any one of claims 5 to 7, characterized in that, The method includes: Obtaining a digital signal; wherein, the digital signal is generated by a motor shaft displacement detection device through detecting the position of the motor shaft; Calculate the real-time frequency of the digital signal, and generate a control signal according to the real-time frequency and a preset frequency; Output the control signal; wherein, the control signal is used to control the vibration frequency of the motor.

9. The motor control method according to claim 8, characterized in that, The preset frequency includes a first preset frequency and a second preset frequency, and the first preset frequency is less than the second preset frequency; the control signal includes a first control signal, a second control signal, and a third control signal; The generating the control signal according to the real-time frequency and the preset frequency includes: Compare the real-time frequency with the first preset frequency and the second preset frequency respectively; When the real-time frequency is less than the first preset frequency, generate the first control signal; wherein, the motor driver is used to control the motor to increase the vibration frequency according to the first control signal; When the real-time frequency is greater than the first preset frequency and less than the second preset frequency, generate the second control signal; wherein, the motor driver is used to control the motor to maintain the current vibration frequency according to the second control signal; When the real-time frequency is greater than the second preset frequency, generate the third control signal; wherein, the motor driver is used to control the motor to decrease the vibration frequency according to the third control signal.

10. An electric toothbrush, characterized in that, Include the motor control system according to any one of claims 5 to 7.

11. The electric toothbrush according to claim 10, wherein The electric toothbrush further includes a brush head and a handle; The main controller, the motor, and the motor shaft displacement detection device are all installed in the inner cavity of the handle; the motor shaft displacement detection device corresponds to the position of the motor shaft of the motor, so that the motor shaft displacement detection device can generate a first magnetic field at the position where the motor shaft is located; the motor is used to drive the brush head to vibrate through the motor shaft.

12. The electric toothbrush according to claim 10 or 11, wherein The motor shaft displacement detection device is electrically connected to the main controller through a flexible circuit board.

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