Motor with active damping function for electric toothbrush
By introducing coaxially connected reverse oscillators into the sound wave motor of the electric toothbrush, a mechanical wave with a phase difference of half a cycle is generated, which solves the problem of brush handle vibration and realizes the electric toothbrush motor design with shock absorption effect at any frequency.
Patent Information
- Application Number
- CN202421071225.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-16
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-05-16
AI Technical Summary
The sound wave motor in existing electric toothbrushes will cause the brush handle to vibrate when working, giving users an uncomfortable experience.
A motor with active shock absorption function for electric toothbrushes is designed. By introducing coaxially connected reverse oscillators into the acoustic wave motor, mechanical waves with the same frequency as the acoustic motor but with a phase difference of half a period are generated to reduce the vibration of the brush handle.
There is a shock absorption effect when working at any frequency. The electric toothbrush vibrates less when using this motor, which improves the user experience.
Smart Images
Figure CN222563629U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of electric toothbrushes and relates to a motor for an electric toothbrush, in particular to a motor with an active shock absorbing function for an electric toothbrush. Background Art
[0002] Sonic motors are motors that rotate back and forth in a small amplitude near the equilibrium position when driven by alternating current. They are common in the field of electric toothbrushes and are usually called sonic motors. When an electric toothbrush using a sonic motor is working, the motor shaft and brush head rotate back and forth in a small amplitude around their own center, driving the bristles to make a small left and right swing.
[0003] According to Newton's third law, when the brush handle applies a rightward force to the motor shaft and the brush head, the motor shaft and the brush head also apply a leftward force to the brush handle in turn (actually it is the torque generated by the electromagnetic force inside the motor that causes the motor shaft and the brush head to rotate to the right, while the reverse torque of the motor shaft and the brush head causes the brush handle to rotate to the left). Therefore, when the motor shaft and the brush head rotate back and forth left and right under the action of the electromagnetic force of the brush handle, the brush handle will also rotate back and forth right and left under the action of the reaction force of the motor shaft and the brush head. This makes the user feel that the brush handle is shaking his hand when using the electric brush, which makes him feel uncomfortable.
[0004] Therefore, in view of the defects existing in the above-mentioned prior art, it is necessary to develop a new type of motor with active vibration reduction function for electric toothbrushes. Utility Model Content
[0005] In order to overcome the defects of the prior art, the utility model provides a motor with active vibration reduction function for an electric toothbrush, which has a vibration reduction effect when working at any frequency, and the brush handle of the electric toothbrush vibrates less when the motor is used.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] A motor with active shock absorption function for an electric toothbrush, comprising a sonic wave motor, characterized in that it also comprises a reverse vibrator coaxially connected to the sonic wave motor, the mechanical wave generated by the reverse vibrator has the same frequency as the mechanical wave generated by the sonic wave motor, the phase difference is half a cycle, and the valley-peak value of the mechanical wave generated by the reverse vibrator is equal to the peak-valley value of the mechanical wave generated by the sonic wave motor.
[0008] Preferably, the reverse oscillator includes a mover, a magnet, a shaft, a stator, a winding and an end cover, the front end of the shaft is rigidly connected to the rear end cover of the acoustic wave motor, and the rear end is rotatably connected to the end cover, the stator is sleeved on the shaft, the winding is wound on the stator teeth of the stator, one side of the magnet is fixed on the inner surface of the mover, and the other side is parallel to the surface of the stator with a gap, and the rear end of the mover is mounted on the end cover.
[0009] Preferably, the gap is a gap greater than 0 and less than 0.8 mm.
[0010] Preferably, the rear end of the shaft is rotatably connected to the end cover via two bearings.
[0011] Preferably, the reverse vibrator further comprises a rear cover covering the rear end surface of the end cover and fixedly connected to the rear end surface of the shaft.
[0012] Preferably, the rear cover is rigidly connected to the handle of the electric toothbrush.
[0013] Preferably, the housing of the sonic motor is rigidly connected to the handle of the electric toothbrush, and the motor shaft is tightly matched with the brush head of the electric toothbrush.
[0014] Compared with the prior art, the motor with active damping function for an electric toothbrush of the utility model has one or more of the following beneficial technical effects:
[0015] 1. The utility model has a vibration reduction effect when working at any frequency, and the brush handle of the electric toothbrush vibrates less when the motor is used.
[0016] 2. The utility model has a simple structure and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of a motor with active vibration reduction function for an electric toothbrush of the utility model;
[0018] Figure 2 yes Figure 1 A cross-sectional view parallel to the paper surface;
[0019] Figure 3 yes Figure 1 A cross-sectional view perpendicular to the paper surface;
[0020] Figure 4 It is a radial cross-sectional view of the reverse vibrator of the motor with active vibration reduction function for the electric toothbrush of the utility model. DETAILED DESCRIPTION
[0021] Before describing in detail any embodiment of the utility model, it should be understood that the utility model is not limited in its application to the construction and arrangement details of the components described below or illustrated in the following figures. The utility model can have other embodiments and can be practiced or carried out in various ways. In addition, it should be understood that the words and terms used here are for descriptive purposes and should not be considered restrictive. The use of "including" or "having" and its variations herein is intended to cover the items and their equivalents and additional items displayed below. Unless otherwise specified or limited, the terms "install", "connect", "support" and "couple" and their variations are widely used and cover direct installation and indirect installation, connection, support and connection. In addition, "connect" and "couple" are not limited to physical or mechanical connections or connections.
[0022] Furthermore, on the first aspect, in the disclosure of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore the above terms cannot be understood as limitations on the present invention; on the second aspect, the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" cannot be understood as a limitation on the quantity.
[0023] Figure 1 The schematic diagram of the structure of the motor with active damping function for the electric toothbrush of the utility model is shown. Figure 1 As shown, the motor with active vibration reduction function for an electric toothbrush of the present invention comprises a sonic motor 1. The sonic motor 1 is used to drive the brush head of the electric toothbrush.
[0024] In the utility model, the sonic motor 1 is a sonic motor in the prior art, which is composed of a motor shaft, a mover, a stator, a housing, a rear end cover and a bearing. The mover is rigidly connected to the motor shaft to form a motor mover assembly, and the housing is rigidly connected to the stator and the end cover to form a motor stator assembly. The motor mover assembly is connected to the housing and the rear end cover through a bearing and can only rotate along the axis rotation center and its extension line (referred to as the "axis").
[0025] Unlike the prior art, the motor with active shock absorption function for the electric toothbrush of the utility model further includes a reverse vibrator 2 coaxially connected to the sonic wave motor 1. The mechanical wave generated by the reverse vibrator 2 has the same frequency as the mechanical wave generated by the sonic wave motor 1, and the phase is half a cycle different, and the valley-peak value of the mechanical wave generated by the reverse vibrator 2 is equal to the peak-valley value of the mechanical wave generated by the sonic wave motor 1. Therefore, when the sonic wave motor 1 vibrates, the reverse vibrator 2 vibrates synchronously, and their vibrations have the same frequency and opposite directions, that is, the mechanical wave generated by the sonic wave motor 1 and the mechanical wave generated by the reverse vibrator 2 have the same frequency, and the vibration period differs by half a cycle, so that the vibration displayed to the outside by the brush handle is minimized as much as possible.
[0026] like Figure 2-Figure 4 (Since the sonic motor 1 is a prior art, for simplicity, Figure 2 and 3 As shown in the figure (the internal structure of the sonic motor 1 is not shown), the reverse oscillator 2 includes a mover 21, a magnetic steel 22, a shaft 23, a stator 24, a winding 25 and an end cover 26.
[0027] The front end of the shaft 23 is rigidly connected to the rear end cover of the sonic motor 1, and the rear end is rotatably connected to the end cover 26. The stator 24 is sleeved on the shaft 23 and rigidly connected to the shaft 23. The winding 25 is wound on the stator teeth of the stator 24. One side of the magnetic steel 22 is fixed to the inner surface of the mover 21, and the other side is parallel to the surface of the stator 24 and separated by a gap. The rear end of the mover 21 is installed on the end cover 26.
[0028] Preferably, the gap is a gap greater than 0 and less than 0.8 mm.
[0029] More preferably, the rear end of the shaft 23 is rotatably connected to the end cover 26 via two bearings 27, so that the end cover 26 can rotate better.
[0030] In addition, although not shown in the drawings, the counter vibrator 2 further includes a rear cover that covers the rear end surface of the end cover 26 and is fixedly connected to the rear end surface of the shaft 23 .
[0031] Thus, the shaft 23, stator 24, winding 25 and rear cover are rigidly connected to form the stator assembly of the reverse oscillator; the mover 21, magnetic steel 22 and end cover 26 form the mover assembly of the reverse oscillator. The mover assembly and the stator assembly are connected together through the bearing 27 on the end cover 26, and the mover assembly can only rotate along the axis of the reverse oscillator.
[0032] The electric toothbrush includes a brush handle, a brush head and other accessories. When in use, the motor with active shock absorption function of the electric toothbrush of the utility model is installed in the brush handle and the motor shaft of the sonic motor 1 extends out of the brush handle to fit tightly with the brush head. Among them, the shell of the sonic motor 1 is rigidly connected to the brush handle of the electric toothbrush, and the rear cover of the reverse oscillator 2 is also rigidly connected to the brush handle of the electric toothbrush. Thus, the stator assembly of the reverse oscillator 2 is rigidly connected to the stator assembly of the sonic motor 1 through the brush handle. In addition, the swing center axis of the mover assembly of the sonic motor 1 is coaxial with the swing center axis of the mover assembly of the reverse oscillator 2, that is, the motor axis is coaxial with the reverse oscillator axis.
[0033] The vibration reduction principle of the motor with active vibration reduction function for the electric toothbrush of the utility model is as follows:
[0034] The mover of the sonic wave motor 1 carries a permanent magnet (i.e., magnetic steel), and a magnetic field is generated around the permanent magnet. The magnetic field generated in the space between the mover and the stator is called the air gap magnetic field. When the electric toothbrush is working, the power supply will provide voltage to the winding of the sonic wave motor 1, and current will flow through the winding. Under the action of the air gap magnetic field and the winding current, an electromagnetic torque will be generated. The mover will rotate in one direction under the action of the electromagnetic torque, and the stator will be subjected to equal and opposite forces. According to demand, the magnitude and direction of the voltage at both ends of the winding will change periodically over time. Correspondingly, a current with a periodic change in magnitude and direction will be generated in the winding. Under the action of the air gap magnetic field, an electromagnetic torque with a periodic change in magnitude and direction will be generated. Under the action of this torque, the motor shaft of the sonic wave motor 1 drives the brush head to swing back and forth. The swing frequency and swing amplitude of the mover and the brush head of the sonic wave motor 1 can be adjusted by the voltage at both ends of the winding.
[0035] The housing and the brush handle of the sonic motor 1 can be regarded as rigidly connected. The stator of the sonic motor 1 is subjected to a torque of the same magnitude and opposite direction as the mover. The housing and the brush handle are also subjected to this torque through transmission, and the brush handle vibrates under the action of this torque. In the process of generating this vibration, the stator of the sonic motor 1 can be regarded as a vibration source, and the vibration generated by it is transmitted to the brush handle in the form of a mechanical wave.
[0036] The mover of the reverse oscillator 2 carries a permanent magnet (i.e., magnetic steel), which generates a magnetic field around it. When the electric toothbrush is working, the power supply will provide voltage to the winding of the reverse oscillator 2, and current will flow through the winding. Under the action of the air gap magnetic field and the winding current, an electromagnetic torque will be generated, and the mover of the reverse oscillator 2 will swing back and forth under the action of the electromagnetic torque. The swing frequency and swing amplitude of the reverse oscillator 2 can be adjusted by the voltage at both ends of the winding.
[0037] The stator of the reverse oscillator 2 can be regarded as a rigid connection with the housing and brush handle of the sonic wave motor 1. The torque applied to the stator of the reverse oscillator 2 is also transmitted to the housing and brush handle of the sonic wave motor 1. Under the action of this torque, the brush handle will also vibrate. During the generation of this vibration, the stator of the reverse oscillator 2 can be regarded as a vibration source, and the vibration generated by it is transmitted to the brush handle in the form of a mechanical wave. For the convenience of description, the mechanical wave generated by the stator of the sonic wave motor 1 is defined as mechanical wave a, and the mechanical wave generated by the stator of the reverse oscillator 2 is defined as mechanical wave b.
[0038] In actual operation of an electric toothbrush, the vibration of the brush handle is the result of the combined action of multiple mechanical waves, among which mechanical wave a and mechanical wave b play a major role in the vibration of the brush handle.
[0039] Without considering other noise, mechanical wave a and mechanical wave b synthesize mechanical wave ξ, whose frequency and peak-to-valley value determine the vibration of the brush handle. When the swing center of the mover of the sonic motor 1 is coaxial with the swing center of the mover of the reverse vibrator 2, the spatial vibration directions of mechanical wave a and mechanical wave b are the same, and the superposition of the two will have the following effects: when mechanical wave a and mechanical wave b have the same frequency and a phase difference of half a cycle, the peak-to-valley value of mechanical wave ξ decreases, and the vibration of the brush handle decreases: when mechanical wave a and mechanical wave b have the same frequency and a phase difference of half a cycle, and the peak-to-valley value of mechanical wave a is equal to the peak-to-valley value of mechanical wave b, mechanical wave ξ will become a straight line, and the brush handle will not vibrate.
[0040] Thus, by adjusting the voltage at both ends of the winding of the reverse vibrator 2, the swing frequency and swing amplitude of the mover of the reverse vibrator 2 are changed, so that the frequency of the mechanical wave b generated by the stator of the reverse vibrator 2 is the same as that of the mechanical wave a, the phase is half a cycle different from that of the mechanical wave a, and the valley peak value is equal to the peak valley value of the mechanical wave a. In this way, the vibration of the brush handle will only be affected by other noises, and the vibration of the electric toothbrush handle will be significantly improved.
[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Those skilled in the art can modify or replace the technical solution of the utility model according to the idea of the utility model without departing from the essence and scope of the technical solution of the utility model.
Claims
1. A motor with active vibration reduction function for an electric toothbrush, comprising a sonic motor (1), characterized in that: It also includes a reverse vibrator (2) coaxially connected to the sonic wave motor (1), wherein the mechanical wave generated by the reverse vibrator (2) has the same frequency as the mechanical wave generated by the sonic wave motor (1), has a phase difference of half a cycle, and the valley-peak value of the mechanical wave generated by the reverse vibrator (2) is equal to the peak-valley value of the mechanical wave generated by the sonic wave motor (1).
2. The motor with active vibration reduction function for an electric toothbrush according to claim 1, characterized in that: The reverse oscillator (2) comprises a mover (21), a magnetic steel (22), a shaft (23), a stator (24), a winding (25) and an end cover (26); the front end of the shaft (23) is rigidly connected to the rear end cover of the sonic motor (1), and the rear end is rotatably connected to the end cover (26); the stator (24) is sleeved on the shaft (23); the winding (25) is wound on the stator teeth of the stator (24); one side of the magnetic steel (22) is fixed on the inner surface of the mover (21), and the other side is kept parallel to the surface of the stator (24) and separated by a gap; the rear end of the mover (21) is mounted on the end cover (26).
3. The motor with active vibration reduction function for an electric toothbrush according to claim 2, characterized in that: The gap is a gap greater than 0 and less than 0.8 mm.
4. The motor with active vibration reduction function for an electric toothbrush according to claim 3, characterized in that: The rear end of the shaft (23) is rotatably connected to the end cover (26) via two bearings (27).
5. The motor with active vibration reduction function for an electric toothbrush according to claim 4, characterized in that: The reverse vibrator (2) also includes a rear cover covering the rear end surface of the end cover (26) and fixedly connected to the rear end surface of the shaft (23).
6. The motor with active vibration reduction function for an electric toothbrush according to claim 5, characterized in that: The rear cover is rigidly connected to the handle of the electric toothbrush.
7. The motor with active vibration reduction function for an electric toothbrush according to any one of claims 1 to 6, characterized in that: The shell of the sonic motor (1) is rigidly connected to the handle of the electric toothbrush, and the motor shaft is tightly matched with the brush head of the electric toothbrush.