Active vibration reduction motor and active vibration reduction method of motor

Abstract

The present invention discloses an active vibration reduction motor and an active vibration reduction method for a motor, comprising a front housing, a rear housing, a stator assembly, a first rotor assembly, and a second rotor assembly. The first rotor assembly can be rotatably assembled in the front housing, the second rotor assembly can be rotatably assembled in the rear housing, the stator assembly is fixedly arranged between the front housing and the rear housing, the stator assembly includes an insulating frame and an outer iron core, a coil is wound on the insulating frame, the outer iron core passes through the coil and is fixed to the insulating frame, and the second rotor assembly is provided with a counterweight. The first rotor assembly and the second rotor assembly rotate in opposite directions. Since the two reaction forces are in opposite directions and have the same moment of inertia, the resultant forces on the stator assembly cancel each other out, and thus the front housing and the rear housing connected to the stator assembly do not generate vibration during operation, thereby achieving active vibration reduction. The handle of an electric toothbrush equipped with the motor will not generate unnecessary vibration, thereby greatly improving the user's experience when using the electric toothbrush.

Description

Technical Field

[0001] The present invention relates to the field of motor technology, and in particular to an active vibration reduction motor and an active vibration reduction method for a motor. Background Art

[0002] As we all know, the working principle of existing electric toothbrush motors is that there are stators and rotors inside the motor, and copper wire windings are set in a certain way on the outer iron core of the stator or rotor. When the external drive circuit inputs a driving current with a certain frequency and duty cycle to the copper wire, the copper wire windings generate an alternating magnetic field of a certain frequency. The permanent magnets set on the rotor or stator generate a force with the alternating magnetic field, thereby driving the motor shaft to swing back and forth at a certain angle around the center with the shaft as the center.

[0003] However, existing motors have a problem: when the rotor is subjected to the electromagnetic force of the stator and swings back and forth about its axis, the stator is also subjected to the rotor's reverse force, causing high-frequency vibrational oscillation (the principle of action and reaction). The stator is typically connected to the motor housing, which is then fixed within the electric toothbrush mechanism. Therefore, the high-frequency vibration of the stator is ultimately transmitted through the motor housing to the electric toothbrush handle, causing discomfort to the user. These additional vibrations can seriously affect the user experience of the product. For example, Chinese utility model patent CN201721490533.8 discloses a portable ultrasonic toothbrush motor device with the aforementioned structure. Another type of motor on the market uses passive vibration reduction, which involves placing a vibration-damping pad on the motor housing. Although this has some vibration reduction effect, it cannot completely eliminate a large amount of other vibrations, resulting in poor vibration reduction. For example, Chinese utility model patent CN201910617874.4 discloses a micro-motor vibration reduction device. Therefore, the above-mentioned drawbacks are very significant. To address these issues, we propose a motor with active vibration reduction and a method for active vibration reduction of a motor. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a motor with active vibration reduction and a method for active vibration reduction of a motor.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A motor with active vibration reduction includes a front housing, a rear housing, a stator assembly, a first rotor assembly, and a second rotor assembly. The first rotor assembly can be rotatably assembled in the front housing, and the second rotor assembly can be rotatably assembled in the rear housing. The stator assembly is fixedly arranged between the front housing and the rear housing. The stator assembly includes an insulating frame and an outer iron core. A coil is wound on the insulating frame. The outer iron core is fixed to the insulating frame through the coil. Extensions at both ends of the outer iron core are embedded in the front housing and the rear housing and are located on both sides of the first rotor assembly and the second rotor assembly. The first rotor assembly and the second rotor assembly are arranged coaxially, and a counterweight is provided at the exposed end of the second rotor assembly.

[0007] Preferably, the front and rear ends of the front shell and the rear shell are both provided with coaxial positioning cavities, bearings are installed in the positioning cavities, and both ends of the first rotor assembly and the second rotor assembly are installed on the bearings.

[0008] Preferably, there are two outer iron cores in a bow shape, and the coil is arranged in the middle of the outer iron core.

[0009] Preferably, the outer core is H-shaped, and the coil is arranged on the crossbeam in the middle of the outer core.

[0010] Preferably, the inner cavities of the front shell and the rear shell are both inlaid with inner iron cores, and the extensions of the outer iron cores are both in contact with the inner iron cores.

[0011] Preferably, an extended shaft is fixedly connected to the exposed end of the first rotor assembly.

[0012] Active vibration reduction method for motor

[0013] S1: The front housing and the rear housing are connected as a whole through a stator assembly, and a first rotor assembly and a second rotor assembly are coaxially arranged on the center line of the front housing and the rear housing;

[0014] S2: The magnetic poles of the first rotor assembly and the second rotor assembly are opposite. When a driving current with a certain frequency and duty cycle is input to the stator assembly, the first rotor assembly rotates in the forward direction and the second rotor assembly rotates in the reverse direction. At this time, the stator assembly will be subjected to two reaction forces in opposite directions generated by the first and second rotor assemblies.

[0015] S3: Since the first rotor assembly and the second rotor assembly rotate in opposite directions and have the same moment of inertia, the resultant forces of the two opposite reaction forces acting on the stator assembly cancel each other out, and the front housing and the rear housing do not vibrate, so the front housing and the rear housing achieve the purpose of active shock absorption.

[0016] Compared with the prior art, the present invention has significant advantages and beneficial effects. Specifically, due to the adoption of the above-mentioned scheme, the front shell and the rear shell are connected as a whole through the stator assembly, and a first rotor assembly and a second rotor assembly arranged coaxially are provided on the center line of the front shell and the rear shell. After the stator assembly is energized, the first rotor assembly and the second rotor assembly rotate in opposite directions. The stator assembly will be subjected to two reaction forces in opposite directions at this time. Since the two reaction forces are in opposite directions and have the same rotational inertia, the resultant forces of the two reaction forces acting on the stator assembly cancel each other out, and thus the front shell and the rear shell connected to the stator assembly do not generate vibration during operation, realizing the function of active shock absorption, and have a good shock absorption effect. The handle of the electric toothbrush equipped with this motor will not generate unnecessary vibration, so the user experience when using the electric toothbrush is greatly improved, and the actual use needs of the user are met. It has a simple structure and is easy to use. Compared with the technology of existing motors, it has outstanding substantial characteristics and significant progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an axonometric view of an embodiment of the present invention.

[0018] Figure 2 It is a schematic structural diagram of a bow-shaped outer iron core according to an embodiment of the present invention.

[0019] Figure 3 It is a schematic structural diagram of an H-shaped outer iron core according to an embodiment of the present invention.

[0020] In the picture:

[0021] 1. Front housing; 2. Rear housing; 3. Stator assembly; 4. First rotor assembly; 5. Second rotor assembly; 6. Insulation frame; 7. Outer core; 8. Coil; 9. Extension; 10. Counterweight; 11. Positioning cavity; 12. Bearing; 13. Inner core; 14. Extension shaft. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper end", "lower end", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and 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 operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0024] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integral connections. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary, and they may refer to internal communication between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0025] like Figures 1 to 3 As shown, the present embodiment provides an active vibration reduction motor, comprising a front housing 1, a rear housing 2, a stator assembly 3, a first rotor assembly 4, and a second rotor assembly 5. The first rotor assembly 4 can be rotatably assembled in the front housing 1, and the second rotor assembly 5 can be rotatably assembled in the rear housing 2. The stator assembly 3 is fixedly arranged between the front housing 1 and the rear housing 2. The stator assembly 3 includes an insulating frame 6 and an outer iron core 7. A coil 8 is wound on the insulating frame 6. The outer iron core 7 is fixed on the insulating frame 6 through the coil 8. Extensions 9 at both ends of the outer iron core 7 are embedded in the front housing 1 and the rear housing 2 and are located on both sides of the first rotor assembly 4 and the second rotor assembly 5. The first rotor assembly 4 and the second rotor assembly 5 are coaxially arranged, and a counterweight 10 is provided at the exposed end of the second rotor assembly 5. The exposed end of the first rotor assembly 4 is installed with a toothbrush head during actual use. In order to ensure that the rotational inertia of the second rotor assembly 5 is the same as that of the first rotor assembly 4, the second rotor assembly 5 requires a counterweight 10 to adjust the rotational inertia. Therefore, the function of the counterweight 10 of the second rotor assembly 5 is to make the rotational inertia of the first rotor assembly 4 and the second rotor assembly 5 the same and to perform a balanced configuration.

[0026] When this embodiment is actually working, a driving current of a certain frequency and duty cycle is first input to the stator assembly 3, so that the first rotor assembly 4 rotates forward and the second rotor assembly 5 rotates reversely. At this time, the stator assembly 3 will be subjected to two reaction forces in opposite directions by the first rotor assembly 4 and the second rotor assembly 5. The exposed end of the first rotor assembly 4 is connected to the toothbrush head, and the exposed end of the second rotor assembly 5 is provided with a counterweight 10. The weight of the counterweight 10 is the same as the weight of the toothbrush head, so the directions of the two reaction forces are opposite and the moment of inertia is the same, so the resultant force of the two reaction forces acting on the stator assembly 3 cancels each other out, and then the front shell 1 and the rear shell 2 connected to the stator assembly 3 do not generate vibration during operation, realizing the function of active shock absorption, with good shock absorption effect, and the handle of the electric toothbrush with this motor built in will not generate unnecessary vibration, so it effectively improves the user experience when using the electric toothbrush and meets the actual use needs of the user.

[0027] Furthermore, in this embodiment, the front and rear ends of the front housing 1 and the rear housing 2 are both provided with mutually coaxial positioning cavities 11, and bearings 12 are installed in the positioning cavities 11. Both ends of the first rotor assembly 4 and the second rotor assembly 5 are mounted on the bearings 12. Therefore, the provision of the bearings 12 allows the first rotor assembly 4 and the second rotor assembly 5 to rotate smoothly at high speed, and also ensures the stable operation of the first rotor assembly 4 and the second rotor assembly 5. At the same time, the front and rear ends of the front housing 1 and the rear housing 2 are both provided with mutually coaxial positioning cavities 11, so that the bearings 12 can be accurately and coaxially installed on the front housing 1 and the rear housing 2, thereby effectively reducing the installation error of the first rotor assembly 4 and the second rotor assembly 5, and ensuring the coaxiality of the first rotor assembly 4 and the second rotor assembly 5 after installation.

[0028] Furthermore, the outer cores 7 of this embodiment are two and are in a bow shape (e.g. Figure 2 As shown in FIG, the coil 8 is arranged in the middle of the outer core 7. The bow-shaped design of the outer core 7 is to facilitate the fixing and installation of the coil 8 in the middle of the outer core 7. A groove is formed in the middle of the outer core 7 to facilitate the fixing of the coil 8.

[0029] Furthermore, the outer core 7 of this embodiment is in an H-shaped (e.g. Figure 3 As shown in FIG, the coil 8 is arranged at the crossbeam in the middle of the outer core 7. The H-shaped outer core 7 makes the overall structure of the outer core 7 lighter and also facilitates the fixing of the coil 8 at the crossbeam in the middle of the outer core 7.

[0030] Furthermore, in this embodiment, the inner cavities of the front housing 1 and the rear housing 2 are both embedded with an inner core 13, and the extension 9 of the outer core 7 is in contact with the inner core 13. Thus, the outer core 7 and the inner core 13 form a complete stator core, and the inner core 13 is integrally injection-molded within the front housing 1 and the rear housing 2, effectively improving the installation accuracy of the inner core 13.

[0031] Furthermore, the exposed end of the first rotor assembly 4 of this embodiment is fixedly connected to an extension shaft 14. This reduces the manufacturing length of the shaft on the first rotor assembly 4, avoids the manufacture and processing of a slender shaft, and reduces the manufacturing difficulty of the first rotor assembly 4. Therefore, the toothbrush head is inserted and installed on the extension shaft 14, making it convenient for users to install and remove the toothbrush head.

[0032] Active vibration reduction method for motor

[0033] S1: The front housing 1 and the rear housing 2 are connected as a whole via a stator assembly 3. A first rotor assembly 4 and a second rotor assembly 5 are coaxially arranged on the center line of the front housing 1 and the rear housing 2;

[0034] S2: The magnetic poles of the first rotor assembly 4 and the second rotor assembly 5 are opposite. When a driving current with a certain frequency and duty cycle is input to the stator assembly 3, the first rotor assembly 4 rotates in the forward direction and the second rotor assembly 5 rotates in the reverse direction. At this time, the stator assembly 3 will be subjected to two reaction forces in opposite directions generated by the first rotor assembly 4 and the second rotor assembly 5;

[0035] S3: Since the first rotor assembly 4 and the second rotor assembly 5 rotate in opposite directions and have the same moment of inertia, the stator assembly 3 is subjected to two opposite reaction forces, which cancel each other out. The front housing 1 and the rear housing 2 do not vibrate, so the front housing 1 and the rear housing 2 achieve the purpose of active shock absorption.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A motor with active vibration reduction, characterized in that: It includes a front housing, a rear housing, a stator assembly, a first rotor assembly, and a second rotor assembly. The first rotor assembly can be rotatably assembled in the front housing, and the second rotor assembly can be rotatably assembled in the rear housing. The stator assembly is fixedly arranged between the front housing and the rear housing. The stator assembly includes an insulating frame and an outer iron core. A coil is wound on the insulating frame. The outer iron core is fixed to the insulating frame through the coil. Extensions at both ends of the outer iron core are embedded in the front housing and the rear housing and are located on both sides of the first rotor assembly and the second rotor assembly. The first rotor assembly and the second rotor assembly are coaxially arranged, and a counterweight is provided at the exposed end of the second rotor assembly.

2. The active vibration reduction motor according to claim 1, characterized in that: The front and rear ends of the front housing and the rear housing are both provided with coaxial positioning cavities, bearings are installed in the positioning cavities, and both ends of the first rotor assembly and the second rotor assembly are installed on the bearings.

3. The active vibration reduction motor according to claim 1, characterized in that: There are two outer iron cores in a bow shape, and the coil is arranged in the middle of the outer iron core.

4. The active vibration reduction motor according to claim 1, characterized in that: The outer iron core is in an "H" shape, and the coil is arranged on the crossbeam in the middle of the outer iron core.

5. The active vibration reduction motor according to claim 1, characterized in that: The inner cavities of the front shell and the rear shell are both inlaid with inner iron cores, and the extensions of the outer iron cores are both in contact with the inner iron cores.

6. The active vibration reduction motor according to claim 1, characterized in that: An extended shaft is fixedly connected to the exposed end of the first rotor assembly.

7. A method for active vibration reduction of a motor, characterized in that: S1: The front housing according to claim 1 and the rear housing according to claim 1 are connected as a whole via the stator assembly according to claim 1, and the first rotor assembly and the second rotor assembly according to claim 1 are coaxially arranged on the center lines of the front housing and the rear housing; S2: The magnetic poles of the first rotor assembly and the second rotor assembly are opposite. When a driving current of a certain frequency and duty cycle is input to the stator assembly according to claim 1, the first rotor assembly rotates in the forward direction and the second rotor assembly rotates in the reverse direction. At this time, the stator assembly is subjected to two reaction forces in opposite directions generated by the first rotor assembly and the second rotor assembly. S3: Since the first rotor assembly and the second rotor assembly rotate in opposite directions and have the same moment of inertia, the resultant forces of the two opposite reaction forces acting on the stator assembly cancel each other out, and the front housing and the rear housing do not vibrate, so the front housing and the rear housing achieve the purpose of active shock absorption.

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