A motor for improving operational stability

Abstract

This utility model discloses a motor that improves operational stability. By setting the connecting bridge on two swing seats, elastic deformation occurs when the swing seats move. This elastic deformation acts on the swing seats, making the swing amplitudes of the two swing seats tend to be the same. After reducing the size of the motor, even without space to install a lever connecting rod, this solution can still achieve the connection between the two swing seats, so that the forces of the two swing seats are mutually transmitted and kept in balance, so that the swing amplitude of each swing of the swing seats remains stable and the swing amplitudes of the two swing seats tend to be the same, thereby improving the operational stability of the motor.

Description

Technical Field

[0001] This utility model relates to the field of motors, and in particular to a motor that improves operational stability. Background Technology

[0002] Electric personal care devices such as shavers and electric clippers require blades to perform high-frequency reciprocating motion, a process that requires the assistance of a motor and transmission structure. In existing technologies, the commonly used transmission structure is usually a motor driving an eccentric wheel to rotate at high speed. The eccentric wheel is connected to the end of the blade holder, thereby realizing the high-frequency reciprocating motion of the blades. However, this technology has technical problems such as high wear and large size.

[0003] To address the aforementioned technical challenges, manufacturers designed brushless magnetic levitation motors. When powered on, these motors generate a magnetic field through their coils, which continuously change direction. This drives a self-aligning oscillating seat to swing. The oscillating seat, equipped with a magnet inside, rotates between positive and negative magnetic fields. When subjected to a positive magnetic field, the oscillating seat swings in one direction. When the positive magnetic field ends and the field reverses, the oscillating seat immediately returns to center and continues swinging in the opposite direction. When the field returns to positive, the oscillating seat swings back to the first direction, repeating this cycle continuously to complete the task. Typically, two oscillating seats are used, swinging in opposite directions. During operation, the reciprocating motions of the two oscillating seats are completely independent. If the force on both oscillating seats is uniform, the motor can operate stably. However, uneven force distribution will result in uneven power distribution and swing amplitude for each oscillating seat, affecting the motor's output. To increase the motor's stability, a connecting rod is usually installed between the two oscillating seats to link their reciprocating motions.

[0004] However, the setup of the lever link and its fulcrum requires space in the motor, making it difficult to reduce the size of the motor. Specifically, in the vertical direction, the lever link needs to occupy a certain height, and some lever link setups make it difficult to reduce the size of the motor in the height direction. In terms of the size of the lever link, in order to accommodate the swing of the swing seat, the length of the lever link has certain requirements, which may prevent the two swing seats from getting too close, making it difficult to reduce the thickness of the motor.

[0005] Furthermore, the levering linkage has certain structural defects in improving stability. For example, in a motor disclosed in CN216490163U, the levering linkage has a groove, which may cause the swing seat to shift in the thickness direction. This is because the swing seat is set by a spring. Although the spring has little deformability in the thickness direction of the motor, there will still be slight movement of the swing seat in the thickness direction. In other words, when the spring is loose, the swing seat will also have displacement in the thickness direction. When the swing seat has additional displacement along the groove, the effect of the levering linkage becomes worse, and the motor will become unstable.

[0006] To be applied to smaller products, the motor needs to operate stably and also has a compact structure and smaller size. Summary of the Invention

[0007] To address the aforementioned technical problems, this utility model provides a motor that improves operational stability. By placing a connecting bridge on two swing seats, elastic deformation occurs when the swing seats move. This elastic deformation then acts on the swing seats, causing their swing amplitudes to tend to be the same. After reducing the motor's size, this solution can still achieve the connection between the two swing seats even when there is no space to install a lever connecting rod. This allows the forces of the two swing seats to be mutually transmitted and kept in balance, ensuring that the swing amplitude of each swing of the swing seats remains stable and the swing amplitudes of the two swing seats tend to be the same, thereby improving the motor's operational stability.

[0008] The technical solution of this utility model is implemented as follows: An electric motor for improving operational stability includes at least two swing seats, with a connecting bridge between two adjacent swing seats. The connecting bridge is configured such that when the motor is energized, the two adjacent swing seats swing in opposite directions, causing the connecting bridge to elastically deform. The elastic force generated by the elastic deformation of the connecting bridge causes the swing amplitudes of the two swing seats to tend to be the same.

[0009] The two swing seats are connected by a connecting bridge, and the elastic force of the connecting bridge connects the two swing seats together, eliminating the need for a corresponding fulcrum as with a lever link. The opposite swing of the two swing seats causes the elastic deformation of the connecting bridge, which in turn acts on the two swing seats. When the two swing seats tend to swing with different amplitudes due to different forces, the connecting bridge prevents the swing seat with a larger amplitude from continuing to swing while pushing the swing seat with a smaller amplitude to continue to swing, thereby balancing the amplitude and output of the two swing seats and making the amplitude and output force of the two swing seats tend to be the same, thus improving the working stability of the motor.

[0010] After reducing the size of the motor, this solution can still achieve the connection between the two swing seats even when there is no space to install the lever linkage. This allows the forces of the two swing seats to be transmitted to each other and remain balanced, so that the swing amplitude of each swing of the swing seats remains stable and the swing amplitudes of the two swing seats tend to be the same, thereby improving the working stability of the motor.

[0011] Preferably, the connecting bridge includes connecting portions at both ends, each fixedly connected to a different swing seat; an elastic portion is provided between the two connecting portions, and the two connecting portions are connected through the elastic portion. The connecting portions are used to connect the swing seats, and are connected to the upper surface of the swing seats; the elastic portion is used to associate the two swing seats together through its own elastic force.

[0012] Preferably, the elastic portion is arc-shaped. The shape of the elastic portion is conducive to elastic deformation.

[0013] Preferably, the connecting bridge is generally ring-shaped. The ring shape of the connecting bridge is to generate and facilitate elastic deformation; the connecting bridge is not a complete ring, but an open ring or a broken ring, to connect the swing seat and the force transmission.

[0014] Preferably, there are two connecting bridges, which are symmetrically arranged. Each pair of swing seats is provided with two opposing connecting bridges, and the two connecting bridges work together on the two swing seats to keep them with the same swing amplitude and output.

[0015] Preferably, the connecting bridge is made of metal or plastic. The connecting bridge needs to balance elasticity and rigidity. If the connecting bridge is too soft, the force transmission effect will be poor, and it will be difficult to achieve synchronization of the two swing seats. If the connecting bridge is too rigid, the swing seats will suffer too much loss due to elastic deformation. Plastic materials such as POM and PPS can be selected.

[0016] Preferably, the device also includes a mounting base, with a spring between the mounting base and the swing base, and the two swing bases are mounted on the mounting base via the spring; the mounting base is provided with a stator coil assembly, which is located between the mounting base and the swing base, and the swing base is provided with a magnet, which is adjacent to the stator coil assembly.

[0017] Preferably, the mounting base has two spring pieces spaced apart on the left and right sides. Each spring piece has a dividing groove running from top to bottom, separating the upper and middle parts of the spring piece. The lower part of the spring piece is complete, forming a lower connecting part, which is fixedly connected to the mounting base. The upper part of the spring piece is divided into two upper connecting parts, which are respectively fixedly connected to two swing seats. This unique design of the spring pieces allows each motor to achieve double swing with only two spring pieces, meaning only one spring piece is needed on each side, further reducing the number of components and lowering production costs.

[0018] Preferably, the mounting base, swing base, and spring are all integrally molded. This facilitates assembly and improves production efficiency.

[0019] Preferably, the mounting base has upwardly extending extension seats at both ends, located on the left and right sides of the swing base, with a return spring on each side. The side-mounted return springs help reduce the dimensions in the motor's height direction.

[0020] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows: The two swing seats are connected by a connecting bridge, and the elastic force of the connecting bridge connects the two swing seats together, eliminating the need for a corresponding fulcrum as with a lever link. The opposite swing of the two swing seats causes the elastic deformation of the connecting bridge, which in turn acts on the two swing seats. When the two swing seats tend to swing with different amplitudes due to different forces, the connecting bridge prevents the swing seat with a larger amplitude from continuing to swing while pushing the swing seat with a smaller amplitude to continue to swing, thereby balancing the amplitude and output of the two swing seats and making the amplitude and output force of the two swing seats tend to be the same, thus improving the working stability of the motor.

[0021] After reducing the size of the motor, this solution can still achieve the connection between the two swing seats even when there is no space to install the lever linkage. This allows the forces of the two swing seats to be transmitted to each other and remain balanced, so that the swing amplitude of each swing of the swing seats remains stable and the swing amplitudes of the two swing seats tend to be the same, thereby improving the working stability of the motor. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the motor in an embodiment of the present invention; Figure 2 This is an exploded view of the motor in an embodiment of the present invention; Figure 3 This is a three-dimensional structural diagram of the main component in an embodiment of the present invention; Figure 4 This is a front view of the main component of the present invention in an embodiment; Figure 5 This is a three-dimensional structural diagram of the present invention showing the installation of a return spring between the swing seat and the extension seat in an embodiment. Figure 6 This is a three-dimensional structural diagram of the spring sheet in an embodiment of the present invention; Figure 7 This is a three-dimensional structural diagram of the connecting bridge in an embodiment of the present invention; Figure 8 This is a top view of the present invention when the swing seat is not in motion in an embodiment; Figure 9 This is a schematic diagram of the swing seat with uneven swing amplitude in an embodiment of this utility model.

[0023] The reference numerals in the attached drawings are as follows: main body 1; mounting base 11; horizontal base 111; vertical base 112; swing base 12; groove 121; spring piece 13; partition groove 131; lower mounting part 132; upper mounting part 133; injection hole 134; stator coil assembly 2; magnet 3; return spring 4; extension base 5; boss 51; reinforcing plate 6; connecting bridge 7; connecting part 71; mounting post 711; elastic part 72; mounting hole 8. Detailed Implementation

[0024] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0026] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] The specific embodiments of this utility model are as follows: like Figure 1 , 2 As shown, this utility model provides a swing motor, including a main body 1, a stator coil assembly 2, and a magnet 3; the main body 1 includes a mounting base 11, a swing base 12, and at least two spring pieces 13, which are arranged at intervals on the left and right sides, and the two ends of the spring pieces 13 are respectively connected to the swing base 12 and the mounting base 11. The mounting base 11, the swing base 12, and the spring pieces 13 are all integrally formed; the stator coil assembly 2 is disposed on the mounting base 11 and located between the mounting base 11 and the swing base 12, and the magnet 3 is disposed on the swing base 12 and adjacent to the stator coil assembly 2.

[0028] In this solution, the mounting base 11, the swing base 12, and the spring piece 13 are integrally molded by injection molding. The entire main body 1 is a single component during assembly. Only the stator coil assembly 2 and the magnet 3 need to be installed on it to complete the production and assembly of the motor. Thanks to the fact that the motor has fewer components and a simplified structure, its production and assembly are simpler and faster, thereby improving production efficiency.

[0029] Specifically, such as Figure 1-3As shown, there are two swing seats 12, each with a magnet 3 below it, and the two magnets 3 are arranged with opposite magnetic properties. After the swing rod and blade are connected to each of the two swing seats 12, a single drive of the stator coil assembly 2 can make the two swing seats 12 swing in opposite directions, resulting in higher working efficiency. There are two spring pieces 13, each with a dividing groove 131 from top to bottom, which is configured to divide the upper and middle parts of the spring piece 13. The lower part of the spring piece 13 is complete and forms a lower mounting part 132, which is fixedly connected to the mounting base 11. The upper part of the spring piece 13 is divided into two upper mounting parts 133, which are fixedly connected to the two swing seats 12 respectively. Through the unique design of the spring piece 13, each motor only needs two spring pieces 13 to achieve double swing, that is, only one spring piece 13 is needed on each side, which further reduces the number of parts and lowers the production cost.

[0030] The mounting base 11 is generally U-shaped. In the left-right direction, the swing seat 12, the spring 13, and the stator coil assembly 2 are all located within the mounting base 11. The mounting base 11 surrounds the swing seat 12, the spring 13, and the stator coil, thus its proportion in the width direction is larger. Specifically, as... Figure 2-5 As shown, the mounting base 11 includes a horizontal base 111 and two vertical bases 112 located at both ends of the horizontal base 111. A spring 13 is disposed on the horizontal base 111, and there is a gap between the vertical bases 112 and the spring 13. There is also a gap between the spring 13 and the stator coil assembly 2. Both the left and right ends of the mounting base 11 have upwardly extending extension seats 5, which are part of the vertical bases 112. The extension seats 5 are located on the left and right sides of the swing base 12, and both are at the same height. A return spring 4 is provided on each of the left and right sides of each swing base 12, and the return springs 4 are arranged in the left-right direction. The two ends of the return spring 4 are respectively set on the swing seat 12 and the extension seat 5. In the prior art, the return spring 4 is set on both sides of the swing rod, that is, above the swing seat 12. Therefore, the motor of the prior art is forced to have a higher overall height to accommodate the installation of the return spring 4. However, in this solution, the return spring 4 is set on both sides of the swing seat 12. After reducing the height of the return spring 4, the upper part of the main body 1 can be omitted, thereby greatly reducing the overall height of the motor, making the motor smaller in size, with a wider range of applications and more applicable scenarios, and enabling it to be used in more products.

[0031] Furthermore, the extension seat 5 is part of the vertical seat 112. The thickness of the extension seat 5 in the left-right direction is thinner than the thickness of the rest of the vertical seat 112. The gap between the extension seat 5 and the swing seat 12 is larger than the gap between the vertical seat 112 and the spring piece 13. In the prior art, since the return spring 4 requires a certain gap to be installed, it is installed on both sides of the swing rod. However, there is not enough installation space on both sides of the swing seat 12. In this solution, by increasing the proportion of the width of the mounting seat 11, there is enough space between the swing seat 12 and the extension seat 5 to install the return spring 4, thus achieving a reduction in the overall height of the motor.

[0032] The side end face of the swing seat 12 is provided with a groove 121, and the end face of the extension seat 5 facing the swing seat 12 is provided with a boss 51. One end of the return spring 4 is provided on the groove 121, and the other end of the return spring 4 is provided on the boss 51, so as to securely install the return spring 4.

[0033] In addition, a swing arm is installed on the swing seat 12.

[0034] like Figure 6 As shown, injection holes 134 are provided on both the upper mounting part 133 and the lower mounting part 132 of the spring piece 13. When the spring piece 13 is integrally injection molded with the mounting base 11 and the swing base 12, the mounting base 11 and the swing base 12 will naturally enter the injection hole 134, thereby making the injection more secure. The middle part of the spring piece 13 is hollowed out under the action of the dividing groove 131, and the hollow is elliptical.

[0035] like Figure 1 , 2 As shown, reinforcing plates 6 are fixedly installed on both the front and rear ends of the mounting base 11. The reinforcing plates 6 are configured to fix the stator coil assembly 2 in the front-rear direction. The cross seat 111 is thinned, and the reinforcing plate 6 protrudes at this location. The protrusion of the reinforcing plate 6 enters the space formed by the thinning at this location. The reinforcing plate 6 is connected and fixed to the mounting base 11 by screws. The reinforcing plate 6 is made of resin injection molding.

[0036] More specifically, the distance between the top surface of the swing base 12 and the bottom surface of the mounting base 11 is the motor height, and the distance between the left and right end faces of the mounting base 11 is the motor width. The ratio of the motor height to the motor width is no greater than 0.58. In this embodiment, the motor height is 19.5mm and the motor width is 35mm, so the ratio is approximately 0.56. Taking a shaver as an example, since the swing motor also needs to be equipped with a swing rod to connect the blades, the height of the product will be further increased. If a motor with a height-to-width ratio close to 1 is used, the product can only be long and narrow, with a large volume ratio and a lot of wasted space, causing inconvenience in placement or carrying in daily life. The lower height-to-width ratio of the internal motor makes the height-to-width ratio of the complete product more controllable, thereby making the product smaller and more portable.

[0037] The swing seat 12 is a strip-shaped body arranged horizontally in the left-right direction, and the length of the swing seat 12 in the left-right direction is less than the length of the mounting seat 11 in the left-right direction; the height of the extension seat 5 is configured to at least exceed the lower end of the swing seat 12 and provide a mounting position for the return spring 4; there is a gap between the extension seat 5 and the swing seat 12, and the return spring 4 is horizontally arranged between the end face of the swing seat 12 and the end face of the extension seat 5 in the left-right direction; in this embodiment, the gap between the extension seat 5 and the swing seat 12 is 4.25mm, which accounts for about 12% of the total width, in order to accommodate the return spring 4.

[0038] like Figure 1 , 2 As shown in Figure 7-9, a connecting bridge 7 is further provided on two adjacent swing seats, with one connecting bridge 7 on each of the left and right sides. The two connecting bridges 7 are symmetrically arranged. When the motor is energized, the two adjacent swing seats swing in opposite directions, causing the connecting bridge 7 to elastically deform. The deformation of the connecting bridge 7 generates elastic force, making the swing amplitude of the two swing seats tend to be the same. The two swing seats are connected by the connecting bridge 7, and the elastic force of the connecting bridge 7 is used to connect the two swing seats together, without the need to set corresponding fulcrums as with a lever link. The opposite swing of the two swing seats causes the connecting bridge 7 to elastically deform, and the elastic deformation of the connecting bridge 7 in turn acts on the two swing seats. When the two swing seats tend to have different swing amplitudes due to different forces, the connecting bridge 7 prevents the swing seat with a large swing amplitude from continuing to swing on one side, and pushes the swing seat with a small swing amplitude to continue to swing on the other side, thereby balancing the swing amplitude and output of the two swing seats, making the swing amplitude and output force of the two swing seats tend to be the same, and improving the working stability of the motor.

[0039] After reducing the size of the motor, this solution can still achieve the connection between the two swing seats even when there is no space to install the lever linkage. This allows the forces of the two swing seats to be transmitted to each other and remain balanced, so that the swing amplitude of each swing of the swing seats remains stable and the swing amplitudes of the two swing seats tend to be the same, thereby improving the working stability of the motor.

[0040] Each pair of swing seats is provided with two opposing connecting bridges 7. The two connecting bridges 7 work together on the two swing seats to keep them with the same swing amplitude and output.

[0041] The connecting bridge 7 is roughly annular to facilitate elastic deformation. It is not a complete ring, but rather an open or broken ring, used to connect the swing seats and transmit force. Specifically, the connecting bridge 7 includes connecting portions 71 at both ends, each fixedly connected to a swing seat. An elastic portion 72 is provided between the two connecting portions 71, connecting the two connecting portions 71. The elastic portion 72 is arc-shaped. The connecting portions 71 connect to the swing seats, and are attached to the upper surface of the swing seats. The elastic portion 72 uses its own elastic force to link the two swing seats together. In this embodiment, the distance between the center points of the two connecting portions 71 is less than the diameter of the connecting bridge 7, or even less than its radius; that is, the gap in the connecting bridge 7 is small, and the elastic portion 72 is an arc shape larger than a semicircle.

[0042] The connecting part 71 is provided with a mounting post 711, and the swing seat is provided with a corresponding mounting hole 8. When the connecting part 71 and the swing seat are installed, the mounting post 711 is inserted into the mounting hole 8, and then the connecting part 71 and the swing seat are locked by screws.

[0043] The connecting bridge 7 can be made of metal or plastic. The connecting bridge 7 needs to balance elasticity and rigidity. If the connecting bridge 7 is too soft, the force transmission effect will be poor and it will be impossible to achieve synchronization of the two swing seats. If the connecting bridge 7 is too rigid, the swing seats will suffer too much loss due to elastic deformation. POM, PPS, etc. can be selected as plastic materials.

Claims

1. An electric machine with improved operational stability, characterized in that It includes at least two swing seats, and a connecting bridge is provided between two adjacent swing seats. The connecting bridge is configured such that when the motor is energized, the two adjacent swing seats swing in opposite directions, causing the connecting bridge to elastically deform. The elastic force generated by the elastic deformation of the connecting bridge makes the swing amplitude of the two swing seats tend to be the same.

2. The electric motor with improved operational stability according to claim 1, characterized in that: The connecting bridge includes connecting parts at both ends, each of which is fixedly connected to two swing seats; an elastic part is provided between the two connecting parts, and the two connecting parts are connected through the elastic part.

3. The electric motor with improved operational stability according to claim 2, characterized in that: The elastic part is arc-shaped.

4. The motor with improved operational stability according to claim 1, characterized in that: The connecting bridge is roughly ring-shaped.

5. The motor with improved operational stability according to claim 1, characterized in that: There are two connecting bridges, which are arranged symmetrically.

6. The motor with improved operational stability according to claim 1, characterized in that: The connecting bridge is made of metal or plastic.

7. The motor with improved operational stability according to claim 1, characterized in that: It also includes a mounting base, with a spring between the mounting base and the swing base, and two swing bases are mounted on the mounting base via the spring; a stator coil assembly is mounted on the mounting base, the stator coil assembly is located between the mounting base and the swing base, and a magnet is mounted on the swing base, the magnet being adjacent to the stator coil assembly.

8. The motor with improved operational stability according to claim 7, characterized in that: The mounting base has two spring pieces spaced apart on the left and right. The spring pieces have a dividing groove from top to bottom, which is configured to separate the upper and middle parts of the spring pieces. The lower part of the spring piece is complete and forms a lower connecting part, which is fixedly connected to the mounting base. The upper part of the spring piece is divided into two upper connecting parts, which are fixedly connected to two swing seats respectively.

9. The motor with improved operational stability according to claim 7, characterized in that: The mounting base, swing base, and spring are all integrally molded.

10. The motor with improved operational stability according to claim 7, characterized in that: The mounting base has upward-extending extension seats at both ends. The extension seats are located on the left and right sides of the swing base, and a return spring is provided on each of the left and right sides of the swing base.

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