Reciprocating motor and electric equipment

Abstract

The application relates to the technical field of electric machines, and discloses a reciprocating electric machine and an electric device. The reciprocating electric machine comprises a shell, a reciprocating shaft, a moving magnet, a coil body and a limiting magnet assembly. The shell is enclosed to form an accommodation space. The reciprocating shaft is arranged at least partially in the accommodation space and can move relative to the shell. The moving magnet is arranged in the accommodation space and connected with the reciprocating shaft, and can reciprocate along a first direction. The coil body is arranged along the circumference of the shell and corresponds to the moving magnet. When electrified, the coil body can generate an alternating magnetic field to drive the moving magnet to move relative to the shell. The limiting magnet assembly is arranged on both sides of the moving magnet along the first direction. The limiting magnet assembly and the moving magnet are arranged in a same-pole repulsion mode, and are used for non-contact limiting of the moving magnet. The reciprocating electric machine realizes stroke limiting through repulsion between same-pole magnets, has the advantages of simple structure, quiet operation and long service life, and can be widely applied to devices that need reciprocating driving, such as fascia guns, electric toothbrushes and the like.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to reciprocating motors and electric devices. Background Technology

[0002] Currently, fascia guns have become a common tool for muscle relaxation after exercise. They work by generating high-frequency vibrations through the massage head to act on the muscle fascia, helping to relieve muscle tension and stiffness. Most fascia guns on the market use a traditional motor combined with a mechanical transmission structure to achieve the reciprocating motion of the massage head. That is, a rotary motor drives an eccentric wheel mechanism to convert rotary motion into linear reciprocating motion.

[0003] However, traditional motor drive methods have many shortcomings in practical use. Mechanical parts inevitably come into contact with each other during long-term reciprocating motion, resulting in wear and tear, which ultimately affects the overall service life of the product. Summary of the Invention

[0004] In view of this, the present invention provides a reciprocating motor and electric device to solve the problem that "traditional motors have friction and contact between mechanical parts during use, which leads to a decrease in the overall lifespan of the product".

[0005] In a first aspect, the present invention provides a reciprocating motor, comprising a housing, a reciprocating shaft, a moving magnet, a coil body, and a limiting magnet assembly; the housing encloses a receiving space; the reciprocating shaft is at least partially disposed in the receiving space and is movable relative to the housing; the moving magnet is disposed in the receiving space and connected to the reciprocating shaft, and the moving magnet is movable reciprocating along a first direction; the coil body is correspondingly disposed with the moving magnet, the coil body can generate an alternating magnetic field, and the coil body is used to drive the moving magnet to move relative to the housing; the limiting magnet assembly is fixedly disposed at both ends of the housing along the first direction, and the limiting magnet assembly and the moving magnet are spaced apart in a manner with like magnetic poles facing each other, and the limiting magnet assembly is used to limit the moving magnet in a non-contact manner.

[0006] In one optional embodiment, the limiting magnet assembly includes a first limiting magnet and a second limiting magnet. The moving magnet includes a first magnetic pole and a second magnetic pole disposed at both ends. The first limiting magnet is spaced apart from the first magnetic pole and is disposed opposite to the first magnetic pole with the same magnetic pole. The second limiting magnet is spaced apart from the second magnetic pole and is disposed opposite to the second magnetic pole with the same magnetic pole. The first limiting magnet and / or the second limiting magnet have through holes, and the reciprocating shaft passes through the through holes.

[0007] In one optional embodiment, the accommodating space includes a first subspace, a second subspace, and a third subspace, which are sequentially distributed along a first direction; a first limiting magnet is disposed in the second subspace, a second limiting magnet is disposed in the third subspace, and a moving magnet portion is located in the first subspace; under a first operating condition, the moving magnet moves towards the second subspace, and the distance between the moving magnet and the first limiting magnet decreases; under a second operating condition, the moving magnet moves towards the third subspace, and the distance between the moving magnet and the first limiting magnet increases.

[0008] In one alternative implementation, the diameter of the first subspace is smaller than the diameters of the second and third subspaces.

[0009] In one optional implementation, under a first operating condition, when the distance between the moving magnet and the first limiting magnet is reduced to a first distance, the moving magnet is stationary relative to the first limiting magnet; under a second operating condition, when the distance between the moving magnet and the second limiting magnet is reduced to a second distance, the moving magnet is stationary relative to the second limiting magnet.

[0010] In one alternative embodiment, the reciprocating shaft further includes a mounting portion, in which the moving magnet is interference-fitted with the mounting portion, and the exterior of the mounting portion is clearance-fitted with the inner wall of the housing.

[0011] In one alternative embodiment, the reciprocating motor further includes an isolation ring that abuts against the inner wall of the housing and the mounting portion.

[0012] In one alternative embodiment, the gap between the outer side of the mounting portion and the inner wall of the housing is filled with a lubricating medium.

[0013] In one alternative embodiment, the housing further includes a recess, with the coil body disposed circumferentially along the recess, the recess serving to restrict movement of the coil body along a first direction.

[0014] In a second aspect, the present invention also provides an electric device, including a load component and a reciprocating motor as described in the first aspect; wherein the load component is connected to the reciprocating shaft of the reciprocating motor, and the reciprocating motor can drive the load component to reciprocate.

[0015] The technical solution proposed in this application has at least the following technical effects: This invention sets up a limiting magnet assembly and sets it apart from the moving magnet with the same magnetic poles facing each other. This allows the moving magnet to be limited at the end of its stroke by the repulsive force between the same magnetic poles. The moving magnet and the limiting magnet assembly always remain in a non-contact state, eliminating the impact noise and contact wear caused by physical collisions in traditional mechanical limiting methods. This achieves truly silent operation and significantly extends the service life of the motor.

[0016] Furthermore, as the moving magnet moves toward the end of its stroke, its kinetic energy is gradually converted into magnetic potential energy and stored in the magnetic field between the moving magnet and the limiting magnet assembly. When the coil body switches the current direction, the stored magnetic potential energy is released and converted into the kinetic energy of the moving magnet, assisting the moving magnet to accelerate in the reverse direction. This energy storage and release mechanism improves the utilization rate of electrical energy. The moving magnet receives additional assistance when starting in the reverse direction, which is beneficial to improving the frequency and efficiency of reciprocating motion.

[0017] Furthermore, this invention employs an electromagnetic direct drive method, directly driving the moving magnet to move the reciprocating shaft through an alternating magnetic field generated by energizing the coil. This eliminates the need for intermediate conversion mechanisms such as commutators, brushes, eccentric wheels, and connecting rods required in traditional motors, significantly reducing the number of parts, simplifying the overall motor structure, lowering manufacturing costs and assembly difficulty, and eliminating frictional losses and noise sources in mechanical transmission. The non-contact limiting method between the limiting magnet assembly and the moving magnet ensures that the limit position of the moving magnet's stroke is determined by magnetic balance rather than by mechanical hard limiting. Therefore, the limiting position is adaptive and will not change due to manufacturing errors of parts or wear after long-term use, guaranteeing the consistency and reliability of the motor's long-term operation. Simultaneously, this invention features a simple and compact structure, small size, and extremely low operating noise, making it particularly suitable for personal care products with high requirements for size and noise, such as fascia guns and electric toothbrushes. It is also suitable for various automated equipment and medical devices requiring low-noise reciprocating drives, possessing broad application prospects and good market value. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a front view of a reciprocating motor according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a reciprocating motor according to an embodiment of the present invention; Figure 3 This is an isometric view of a reciprocating motor according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Housing; 10. Recess; 2. Reciprocating shaft; 20. Mounting part; 3. Moving magnet; 30. First magnetic pole; 31. Second magnetic pole; 4. Coil body; 5. Limiting magnet assembly; 50. First limiting magnet; 51. Second limiting magnet; 6. Isolation ring; 7. First subspace; 8. Second subspace; 9. Third subspace; X, First direction. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to impose strict limitations on the technical solutions unless the context clearly indicates otherwise. For example, the use of "a," "an," and "the" to modify a feature does not preclude the possibility that the feature may be plural in other embodiments.

[0023] It should be understood that the terms "comprising," "including," and "having" are open-ended, indicating the presence of the stated features but not excluding the possibility of other features in the embodiment. Similarly, the use of terms such as "first," "second," etc., to describe multiple features only indicates the distinction between one feature and another, and such terms do not imply order or sequence unless explicitly stated in the context.

[0024] It should be understood that, unless the context clearly indicates otherwise, the terms "setup," "connection," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a direct connection or an indirect connection via a medium. Those skilled in the art will understand the specific meaning of these terms in this document based on the specific circumstances.

[0025] In addition, for ease of description, the text will use terms of spatial relative relationship to describe the position of one feature relative to another feature, such as "inner", "outer", "end", "side", "upper", "middle", "lower", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations besides those shown in the accompanying drawings of the specification.

[0026] It should be noted that a reciprocating motor is a power device that can directly output linear reciprocating motion and is widely used in fascia guns, electric toothbrushes, reciprocating pumps, compressors, and various automated equipment. Currently, the main method for achieving reciprocating motion is the "rotary motor + motion conversion mechanism" scheme. This involves using a rotary motor in conjunction with mechanical transmission components such as an eccentric wheel, crank connecting rod, cam, or lead screw to convert the motor's rotational motion into linear reciprocating motion. While this traditional solution is technically mature, the presence of the intermediate conversion link results in high mechanical friction losses, low transmission efficiency, and numerous components, leading to a large overall size, complex structure, and cumbersome assembly. More importantly, the various mechanical transmission components inevitably experience hard contact and friction during long-term high-speed reciprocating motion, causing wear on components, affecting product lifespan, and generating significant mechanical noise. Therefore, existing reciprocating motors still require further improvement in noise control, structural simplification, and operating efficiency.

[0027] It should be noted that the core principle of electromagnetic direct drive technology is based on Ampere's law and the physical property that like poles of a magnetic field repel and unlike poles attract. Its basic structure consists of an electromagnetic coil and a permanent magnet. When an alternating current is passed through the electromagnetic coil, an alternating induced magnetic field is generated around the coil, the direction of which changes with the direction of the positive and negative pulses of the current. This alternating induced magnetic field interacts with the inherent magnetic field of the permanent magnet. When the polarities of the induced magnetic field and the permanent magnet's magnetic field are the same, a repulsive force is generated; when the polarities are opposite, an attractive force is generated, thus driving the permanent magnet to move axially. As the direction of the current periodically changes, the direction of the induced magnetic field also periodically reverses, causing the direction of the electromagnetic force on the permanent magnet to alternate, thereby driving the reciprocating shaft 2 connected to it to reciprocate linearly along the axial direction under the action of external force.

[0028] Furthermore, compared to the traditional "rotary motor + eccentric wheel / connecting rod" transmission scheme, electromagnetic direct drive technology eliminates the need for intermediate conversion mechanisms, directly converting electrical energy into linear mechanical energy. This offers advantages such as compact structure, short transmission chain, fast response speed, and low mechanical loss. Simultaneously, by reducing the use of rotating components such as bearings and eccentric wheels, it eliminates noise sources generated by mechanical rotation and friction at their source, facilitating low-noise operation of the equipment.

[0029] The embodiments of this application are described below with reference to the accompanying drawings. It can be understood that the technical features involved in the different embodiments described below can be combined with each other as long as they do not conflict with each other.

[0030] The following is combined with Figures 1 to 3 The following describes embodiments of the present invention.

[0031] According to an embodiment of the present invention, in a first aspect, referring to Figures 1 to 3A reciprocating motor is provided, including a housing 1, a reciprocating shaft 2, a moving magnet 3, a coil body 4, and a limiting magnet assembly 5. The housing 1 encloses a receiving space. The reciprocating shaft 2 is at least partially disposed in the receiving space and is movable relative to the housing 1. The moving magnet 3 is disposed in the receiving space and connected to the reciprocating shaft 2. The moving magnet 3 is movable to reciprocate along a first direction X. The coil body 4 is correspondingly disposed to the moving magnet 3 and can generate an alternating magnetic field. The coil body 4 is used to drive the moving magnet 3 to move relative to the housing 1. The limiting magnet assembly 5 is fixedly disposed at both ends of the housing 1 along the first direction X. The limiting magnet assembly 5 and the moving magnet 3 are spaced apart with their magnetic poles facing each other. The limiting magnet assembly 5 is used to limit the moving magnet 3 in a non-contact manner.

[0032] In this embodiment, the housing 1 is generally a hollow cylindrical structure, and its cross-section can be circular, rectangular, or other suitable shapes. In this embodiment, it is circular to facilitate processing and assembly. The housing 1 can be made of metal materials (such as aluminum alloy) to provide sufficient structural strength and electromagnetic shielding effect, or it can be made of non-metallic materials such as engineering plastics to reduce the weight of the whole machine. The specific choice can be made according to the needs of the actual application scenario.

[0033] Furthermore, the reciprocating shaft 2 is at least partially disposed within the accommodating space, and the reciprocating shaft 2 is movable relative to the housing 1 along a first direction X. The reciprocating shaft 2 extends axially along the housing 1, with its first end extending outside the housing 1 for connecting external load components (such as the massage head of a fascia gun or the brush head of an electric toothbrush), and its second end extending into the accommodating space. The moving magnet 3 is disposed within the accommodating space, and the moving magnet 3 is fixedly connected to the reciprocating shaft 2. When the moving magnet 3 moves axially, it drives the reciprocating shaft 2 to move synchronously. The moving magnet 3 is a permanent magnet, which has fixed magnetic poles (i.e., N pole and S pole), and the magnetization direction of the moving magnet 3 is arranged along the axial direction of the reciprocating shaft 2.

[0034] Understandably, the moving magnet 3 is a cylindrical magnet whose cross-sectional shape is adapted to the cross-sectional shape of the inner cavity of the housing 1. For example, both are circular cross-sections. The moving magnet 3 and the housing 1 form a clearance fit to ensure that the moving magnet 3 can slide freely inside the housing 1 without getting stuck.

[0035] It should be noted that the first direction X is the axial direction of the reciprocating axis 2.

[0036] Furthermore, the coil body 4 is connected to an external power supply and control circuit via wires. When the control circuit supplies alternating current to the coil body 4, an alternating induced magnetic field is generated around the coil body 4, the direction of which changes with the direction of the current. This alternating induced magnetic field interacts with the inherent magnetic field of the moving magnet 3, generating alternating attractive or repulsive forces, thereby driving the moving magnet 3 to drive the reciprocating shaft 2 to move in a reciprocating linear motion along the axial direction.

[0037] It should be noted that when the moving magnet 3 moves along the axial direction and approaches the limiting magnet assembly 5, a gradually increasing repulsive force is generated between the limiting magnet assembly 5 and the moving magnet 3, thereby preventing the moving magnet 3 from continuing to move in that direction until the moving magnet 3 decelerates to a stop, thus achieving non-contact limiting of the stroke in that direction.

[0038] It should be noted that the distance between the limiting magnet assembly 5 and the moving magnet 3 in a static state, that is, when the magnet is not energized and the moving magnet 3 is in its natural equilibrium position, can be set according to actual needs to balance sufficient movement stroke and good limiting effect.

[0039] In one embodiment, refer to Figure 2 The limiting magnet assembly 5 includes a first limiting magnet 50 and a second limiting magnet 51. The moving magnet 3 includes a first magnetic pole 30 and a second magnetic pole 31 disposed at both ends. The first limiting magnet 50 is spaced apart from the first magnetic pole 30, and the first limiting magnet 50 and the first magnetic pole 30 are arranged opposite each other with the same magnetic pole. The second limiting magnet 51 is spaced apart from the second magnetic pole 31, and the second limiting magnet 51 and the second magnetic pole 31 are arranged opposite each other with the same magnetic pole. The first limiting magnet 50 and / or the second limiting magnet 51 are provided with through holes, and the reciprocating shaft 2 passes through the through holes.

[0040] Specifically, by using the above-mentioned method of arranging the same magnetic poles opposite each other, when the moving magnet 3 moves axially and approaches the first limiting magnet 50, a gradually increasing repulsive force is generated between the first limiting magnet 50 and the first magnetic pole 30, thereby preventing the moving magnet 3 from continuing to move in that direction until the moving magnet 3 decelerates to a stop, thus achieving non-contact limiting of the travel in that direction; similarly, when the moving magnet 3 moves in the opposite direction and approaches the second limiting magnet 51, the repulsive force between the second limiting magnet 51 and the second magnetic pole 31 achieves non-contact limiting in the other direction.

[0041] Furthermore, the first limiting magnet 50 and / or the second limiting magnet 51 have an axially penetrating through hole in their center. The reciprocating shaft 2 passes through this through hole, with a gap between the reciprocating shaft 2 and the through hole, allowing the reciprocating shaft 2 to slide freely within the through hole. This enables the first limiting magnet 50 and / or the second limiting magnet 51 to be fitted onto the outside of the reciprocating shaft 2, making the arrangement of the limiting magnets at both ends of the housing 1 more compact and helping to reduce the overall size of the motor. Throughout the limiting process, the moving magnet 3 maintains a non-contact gap with the first limiting magnet 50 and the second limiting magnet 51, fundamentally avoiding noise and wear caused by mechanical collisions.

[0042] In one embodiment, refer to Figure 2The accommodating space includes a first subspace 7, a second subspace 8, and a third subspace 9, which are distributed sequentially along a first direction X. A first limiting magnet 50 is disposed in the second subspace 8, a second limiting magnet 51 is disposed in the third subspace 9, and a moving magnet 3 is partially located in the first subspace 7. Under a first operating condition, the moving magnet 3 moves towards the second subspace 8, and the distance between the moving magnet 3 and the first limiting magnet 50 decreases. Under a second operating condition, the moving magnet 3 moves towards the third subspace 9, and the distance between the moving magnet 3 and the first limiting magnet 50 increases.

[0043] In this embodiment, the accommodating space is sequentially divided into a second subspace 8, a first subspace 7, and a third subspace 9 along the first direction X, i.e., the first subspace 7 is located between the second subspace 8 and the third subspace 9. The first limiting magnet 50 is fixedly disposed in the second subspace 8, the second limiting magnet 51 is fixedly disposed in the third subspace 9, and the moving magnet 3 is slidably disposed in the accommodating space and at least partially located in the first subspace 7, and the moving magnet 3 is located between the first limiting magnet 50 and the second limiting magnet 51, so that the moving magnet 3 can reciprocate between the first limiting magnet 50 and the second limiting magnet 51 along the first direction X.

[0044] Furthermore, under the first operating condition, the moving magnet 3 moves along the first direction X toward the second subspace 8 and approaches the first limiting magnet 50. The axial distance between the moving magnet 3 and the first limiting magnet 50 gradually decreases. Since the end of the moving magnet 3 facing the first limiting magnet 50 is arranged with the first limiting magnet 50 in a manner with the same magnetic poles opposite each other, a gradually increasing repulsive force is generated between the two. This repulsive force prevents the moving magnet 3 from continuing to move toward the second subspace 8 until the speed of the moving magnet 3 decreases to zero, thereby achieving non-contact limiting of the moving magnet 3 in this direction. In the second operating condition, the moving magnet 3 moves away from the second subspace 8 and towards the third subspace 9 along the first direction X. The axial distance between the moving magnet 3 and the first limiting magnet 50 gradually increases, meaning the moving magnet 3 moves away from the first limiting magnet 50. Simultaneously, the moving magnet 3 gradually approaches the second limiting magnet 51, and the axial distance between the moving magnet 3 and the second limiting magnet 51 gradually decreases. Similarly, since the end of the moving magnet 3 facing the second limiting magnet 51 is positioned with the same magnetic pole opposite to the second limiting magnet 51, a gradually increasing repulsive force is generated between them. This repulsive force prevents the moving magnet 3 from continuing to move towards the third subspace 9 until the velocity of the moving magnet 3 decreases to zero, achieving non-contact limiting of the moving magnet 3 in this direction. Thus, the moving magnet 3 reciprocates between the first limiting magnet 50 and the second limiting magnet 51, and is limited by the non-contact repulsive forces of the first limiting magnet 50 and the second limiting magnet 51 at both ends of its stroke.

[0045] In one embodiment, refer to Figure 2The diameter of the first subspace 7 is smaller than the diameters of the second subspace 8 and the third subspace 9.

[0046] In this embodiment, the accommodating space is sequentially divided into a second subspace 8, a first subspace 7, and a third subspace 9 along the first direction X, with the first subspace 7 located between the second subspace 8 and the third subspace 9. The diameter of the first subspace 7 is smaller than the diameters of the second subspace 8 and the third subspace 9; that is, the accommodating space forms a narrowing section in the middle region of the housing 1 along its axial direction, while widening sections are formed at both ends.

[0047] Specifically, the moving magnet 3 is disposed within the accommodating space and is at least partially located in the first subspace 7, and the outer diameter of the moving magnet 3 is adapted to the diameter of the first subspace 7, so that the moving magnet 3 can form a clearance fit with the inner wall of the shell 1 of the first subspace 7, so as to ensure that the moving magnet 3 can slide smoothly without jamming when it reciprocates along the first direction X.

[0048] It should be noted that an isolation ring 6 is provided between the moving magnet 3 and the inner wall of the shell 1 of the first subspace 7. The isolation ring 6 can be made of a flexible wear-resistant material (such as rubber, polytetrafluoroethylene, etc.). The isolation ring 6 is sleeved on the outer periphery of the moving magnet 3 and is located between the moving magnet 3 and the inner wall of the shell 1 of the first subspace 7. On the one hand, the isolation ring 6 can fill the assembly gap between the moving magnet 3 and the inner wall of the shell 1, and play a radial support and positioning role for the moving magnet 3, so that the moving magnet 3 always moves along the axis of the shell 1 during reciprocating motion without radial slippage or swaying, ensuring the smoothness and consistency of the motion trajectory. On the other hand, the isolation ring 6, as a flexible buffer layer, can absorb and attenuate the small vibrations generated during the movement of the moving magnet 3, and avoid rigid collisions or friction between the moving magnet 3 and the inner wall of the shell 1 due to the existence of gaps, thereby further reducing operating noise.

[0049] Furthermore, through the aforementioned structural design of the reduced diameter of the first subspace 7 and the isolation ring 6, the functional requirement of the moving magnet 3 freely reciprocating along the axial direction within the accommodating space is ensured, while the radial degree of freedom of the moving magnet 3 is effectively restricted, thereby improving the stability and reliability of the motor operation. It should be noted that the diameter of the first subspace 7 is designed to accommodate the moving magnet 3 and allow it to slide freely. The diameters of the second subspace 8 and the third subspace 9 are larger than the outer diameter of the moving magnet 3 to facilitate the installation and fixation of the first limiting magnet 50 and the second limiting magnet 51, and to provide them with sufficient accommodating space.

[0050] In one embodiment, refer to Figure 2 In the first operating condition, when the distance between the moving magnet 3 and the first limiting magnet 50 is reduced to a first distance, the moving magnet 3 is stationary relative to the first limiting magnet 50; in the second operating condition, when the distance between the moving magnet 3 and the second limiting magnet 51 is reduced to a second distance, the moving magnet 3 is stationary relative to the second limiting magnet 51.

[0051] Specifically, in the first operating condition, the moving magnet 3 moves from the first subspace 7 to the second subspace 8. The axial distance between the moving magnet 3 and the first limiting magnet 50 gradually decreases, and the repulsive force between their like magnetic poles gradually increases as the distance decreases. This repulsive force creates a reverse resistance on the moving magnet 3, causing its speed to gradually decrease. When the distance between the moving magnet 3 and the first limiting magnet 50 decreases to a first distance, the electromagnetic driving force and the repulsive force between the like magnetic poles on the moving magnet 3 reach a dynamic balance, and the speed of the moving magnet 3 decreases to zero. At this time, the moving magnet 3 is stationary relative to the first limiting magnet 50, reaching the travel limit position in this direction, thereby achieving the limitation of the moving magnet 3.

[0052] Furthermore, in the second operating condition, the moving magnet 3 moves from the first subspace 7 to the third subspace 9. The moving magnet 3 moves away from the first limiting magnet 50 and closer to the second limiting magnet 51. The distance between the moving magnet 3 and the first limiting magnet 50 gradually increases, while the distance between the moving magnet 3 and the second limiting magnet 51 gradually decreases. When the distance between the moving magnet 3 and the second limiting magnet 51 decreases to the second distance, the electromagnetic driving force on the moving magnet 3 and the repulsive force of the same magnetic poles generated by the second limiting magnet 51 reach a dynamic balance. The speed of the moving magnet 3 decreases to zero. At this time, the moving magnet 3 is stationary relative to the second limiting magnet 51, reaching the travel limit position in this direction.

[0053] Understandably, as the current direction of the coil body 4 changes periodically, the moving magnet 3 moves back and forth alternately between the two travel limit positions mentioned above. Its range of motion is limited between the first limiting magnet 50 and the second limiting magnet 51. When the moving magnet 3 stops at both ends of its travel, it maintains a non-contact gap with the corresponding limiting magnet. This gap is the first distance or the second distance.

[0054] It should be noted that the specific values ​​of the first and second distances mentioned above can be adaptively set according to factors such as the mass of the moving magnet 3, the magnitude of the driving current of the coil body 4, and the magnetic field strength of the limiting magnet. Those skilled in the art can determine these values ​​through a limited number of experiments, and no specific limitations are made here.

[0055] In one embodiment, refer to Figure 2 The reciprocating shaft 2 also includes a mounting part 20, and the moving magnet 3 is interference-fitted into the mounting part 20. The outside of the mounting part 20 is clearance-fitted with the inner wall of the housing 1.

[0056] Specifically, the mounting part 20 is located at one end of the reciprocating shaft 2 that extends into the accommodating space. It can be a sleeve structure, integrally formed with the reciprocating shaft 2 or separately fixedly connected. The moving magnet 3 is fitted inside the mounting part 20, and the moving magnet 3 and the mounting part 20 are fixedly connected by an interference fit. That is, the inner diameter of the moving magnet 3 is slightly smaller than the outer diameter of the mounting part 20. After the moving magnet 3 is pressed onto the mounting part 20, the radial pressure generated by the interference fit firmly holds the moving magnet 3 on the reciprocating shaft 2, ensuring that there is no relative displacement or loosening between the moving magnet 3 and the reciprocating shaft 2 during the reciprocating motion, while ensuring that the moving magnet 3 can efficiently and synchronously transmit electromagnetic force to the reciprocating shaft 2.

[0057] Furthermore, the outer contour of the mounting part 20 is configured with a clearance fit to the inner wall of the housing 1, meaning the outer diameter of the mounting part 20 is smaller than the inner diameter of the inner wall of the housing 1, forming a uniform annular gap. This gap ensures that the mounting part 20, together with the moving magnet 3 fixed thereon, can slide freely along the first direction X within the accommodating space without contacting or getting stuck with the inner wall of the housing 1, thereby ensuring the smooth movement of the reciprocating shaft 2. Through the aforementioned dual-fit structure of "interference fit between the moving magnet 3 and the mounting part 20, and clearance fit between the mounting part 20 and the inner wall of the housing 1," both a rigid fixed connection between the moving magnet 3 and the reciprocating shaft 2 is achieved, ensuring the reliability of power transmission, and the reciprocating shaft 2 and the moving magnet 3 as a whole can slide freely within the housing 1 with low resistance, which is beneficial to improving the working efficiency and running stability of the motor.

[0058] In one embodiment, refer to Figure 2 The reciprocating motor also includes an isolation ring 6, which abuts against the inner wall of the housing 1 and the mounting part 20.

[0059] In this embodiment, the reciprocating motor also includes an isolation ring 6, which is disposed between the inner wall of the housing 1 and the mounting portion 20, and serves to provide radial support and guidance for the movement of the reciprocating shaft 2. The inner wall of the housing 1 is provided with a mounting groove, which extends circumferentially along the housing 1 and can be a continuous annular groove or multiple arc-shaped groove segments spaced apart circumferentially.

[0060] Specifically, the isolation ring 6 is embedded in the mounting groove, and at least a portion of the isolation ring 6 protrudes from the surface of the inner wall of the housing 1 to abut against the inner wall of the housing 1 and the outer peripheral surface of the mounting part 20. By setting the isolation ring 6 in the mounting groove, on the one hand, the mounting groove is used to axially limit and circumferentially position the isolation ring 6, preventing the isolation ring 6 from moving or shifting axially during the reciprocating motion of the moving magnet 3, ensuring that the isolation ring 6 is always in the preset working position, and ensuring that it continuously supports the reciprocating shaft 2; on the other hand, a sliding fit is formed between the isolation ring 6 and the outer peripheral surface of the mounting part 20. When the reciprocating shaft 2 moves axially, the isolation ring 6 plays a radial constraint role on the reciprocating shaft 2, limiting the radial degree of freedom of the mounting part 20 and the reciprocating shaft 2, preventing the reciprocating shaft 2 from radially wobbling or shaking during the movement, thereby ensuring that the reciprocating shaft 2 always maintains a straight motion trajectory along the axis of the housing 1, improving the motion accuracy and running stability.

[0061] Meanwhile, the isolation ring 6 is made of flexible material and has a certain elastic deformation capability, which can absorb and buffer the radial vibration generated during the reciprocating shaft 2 movement, avoid hard contact or collision between the mounting part 20 and the inner wall of the housing 1 due to radial gap, and achieve noise reduction from multiple directions.

[0062] It should be noted that the number of isolation rings 6 is at least two. When two isolation rings 6 are set, the two isolation rings 6 are respectively set at both ends of the first subspace 7 and abut against the reciprocating shaft 2. When multiple isolation rings 6 are set, the multiple isolation rings 6 are distributed at intervals along the axial direction of the reciprocating shaft 2 so as to provide uniform radial support force to the reciprocating shaft 2 at different axial positions, thereby further improving the stability of the motion.

[0063] Optionally, the isolation ring 6 may be made of wear-resistant rubber or polytetrafluoroethylene material, in order to ensure good sliding performance while having a long service life.

[0064] Furthermore, the depth and width of the mounting groove can be adapted to the cross-sectional dimensions of the insulating ring 6 to ensure that the insulating ring 6 is firmly installed in the mounting groove and that the protrusion height is appropriate, so as not to increase the sliding resistance due to excessive protrusion, nor to lose the radial support effect due to excessive protrusion. Those skilled in the art can determine this through conventional design methods according to specific application requirements.

[0065] In one embodiment, the gap between the outer side of the mounting portion 20 and the inner wall of the housing 1 is filled with a lubricating medium.

[0066] Specifically, the outer diameter of the mounting part 20 is smaller than the inner diameter of the housing 1, so that an annular gap is formed between the outer peripheral surface of the mounting part 20 and the inner wall of the housing 1 surrounding the mounting part 20. After the moving magnet 3 is fixedly fitted outside the mounting part 20, it slides freely along the first direction X within this gap range with the reciprocating shaft 2. The annular gap is filled with a lubricating medium.

[0067] Optionally, the lubricating medium may be lubricating oil, grease, or other liquid or semi-solid lubricating materials with good lubrication performance and chemical stability.

[0068] Furthermore, by filling the gap between the mounting part 20 and the housing 1 with a lubricating medium, on the one hand, the lubricating medium forms a continuous lubricating film between the outer peripheral surface of the mounting part 20 and the inner wall of the housing 1. When the reciprocating shaft 2 drives the mounting part 20 to slide axially, this lubricating film can effectively reduce the coefficient of friction between the mounting part 20 and the inner wall of the housing 1, reduce sliding friction resistance, and make the movement of the reciprocating shaft 2 smoother, which is beneficial to improving the mechanical efficiency and response speed of the motor. On the other hand, the lubricating medium can conduct the heat generated by friction during the high-speed reciprocating motion of the reciprocating shaft 2 to the housing 1 in a timely manner, and dissipate it outward through the housing 1, which plays a good role in heat dissipation and cooling, and avoids the magnetic field stability of the moving magnet 3 and the limiting magnet or the aging of the sealing material due to excessive local temperature rise. Furthermore, the lubricating medium filled in the gap has certain viscosity and damping characteristics, which can absorb and dissipate the small vibration energy generated during the movement of the reciprocating shaft 2, play an auxiliary role in vibration reduction and noise reduction, and further reduce the noise level of the motor during operation.

[0069] In one embodiment, the housing 1 further includes a recess 10, the coil body 4 is disposed circumferentially along the recess 10, and the recess 10 is used to restrict the movement of the coil body 4 along the first direction X.

[0070] Specifically, the recess 10 is disposed on the outer wall of the housing 1 and extends circumferentially along the housing 1. It can be a continuous annular groove structure or multiple arc-shaped groove segments spaced apart circumferentially. The coil body 4 is embedded in the recess 10 and arranged circumferentially along the recess 10. The two side walls of the recess 10 limit the coil body 4 in the axial direction, thereby effectively restricting the movement of the coil body 4 in the first direction X and preventing the coil body 4 from axially moving due to vibration or electromagnetic force during motor operation.

[0071] Furthermore, by setting the recessed portion 10 to axially position the coil body 4, it can ensure that the coil body 4 always maintains a precise axial correspondence with the moving magnet 3, so that the alternating magnetic field generated by the coil body 4 always acts on the effective area of ​​the moving magnet 3, ensuring the stability and consistency of the electromagnetic driving force. On the other hand, the structure of the recessed portion 10 makes it possible to install the coil body 4 without additional fasteners or complex positioning structures, simplifying the assembly process and reducing manufacturing costs.

[0072] In this embodiment, the depth and width of the recess 10 can be adapted to the radial thickness and axial width of the coil body 4 to ensure that the coil body 4 is firmly installed and accurately positioned within the recess 10. Furthermore, an insulating gasket or potting compound can be provided between the recess 10 and the coil body 4 to further improve the insulation performance and bonding strength between the coil body 4 and the housing 1, ensuring the electrical safety and operational reliability of the motor.

[0073] According to an embodiment of the present invention, in a second aspect, an electric device is also provided, including a load component and a reciprocating motor as described in the first aspect; wherein the load component is connected to the reciprocating shaft 2 of the reciprocating motor, and the reciprocating motor can drive the load component to reciprocate.

[0074] In this embodiment, since the electric device proposed in the second aspect includes the reciprocating motor of the first aspect, the electric device has the same technical effect as the reciprocating motor, and the technical effect of the reciprocating motor will not be described in detail here.

[0075] It should be noted that the term "and / or" as used in this specification is an associative description used to indicate one or more possible selection or combination relationships between the two or more listed items. Specifically, "and / or" includes the case where each of the listed items exists individually, as well as the case where any two or more items exist simultaneously, that is, it covers all possible subset combinations of the listed items, and does not exclude the possibility that other unlisted items may exist simultaneously with the combination.

[0076] For example, when expressed as "A and / or B," it should be understood to include the following three implementation schemes: only A exists, only B exists, and both A and B exist simultaneously. Here, A and B represent two different technical features, components, steps, or options. This expression aims to clarify that in the described technical solution, A and B can be either one or both, depending on the specific application scenario or design requirements.

[0077] When a statement refers to three or more items, such as "A, B, and / or C", it should be understood to include all possible combinations of the following: A alone, B alone, C alone, A and B simultaneously, A and C simultaneously, B and C simultaneously, and A, B, and C simultaneously. That is, "and / or" covers all possible combinations of any one or more of the listed items, and each combination is independent of the others and constitutes part of the technical solution disclosed in this specification.

[0078] The above definitions are intended to ensure that those skilled in the art can accurately understand the logical relationship expressed by "and / or" when reading this specification, and to avoid misinterpretation or limitation of the scope of protection of this invention due to ambiguity in language. The use of this term is to describe the various possibilities between technical features more concisely and clearly, rather than to impose exclusive restrictions on specific combinations.

[0079] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A reciprocating motor, characterized in that, include: The shell (1) encloses and forms an accommodating space; A reciprocating shaft (2) is at least partially disposed in the accommodating space, and the reciprocating shaft (2) is movable relative to the housing (1); A moving magnet (3) is disposed in the accommodating space and connected to the reciprocating shaft (2). The moving magnet (3) can reciprocate along the first direction (X). A coil body (4) is provided corresponding to the moving magnet (3). The coil body (4) can generate an alternating magnetic field. The coil body (4) is used to drive the moving magnet (3) to move relative to the shell (1). The limiting magnet assembly (5) is fixedly disposed at both ends of the housing (3) along the first direction (X). The limiting magnet assembly (5) and the moving magnet (3) are spaced apart with their magnetic poles facing each other. The limiting magnet assembly (5) is used to limit the moving magnet (3) in a non-contact manner.

2. The reciprocating motor according to claim 1, characterized in that, The limiting magnet assembly (5) includes a first limiting magnet (50) and a second limiting magnet (51). The moving magnet (3) includes a first magnetic pole (30) and a second magnetic pole (31) at both ends. The first limiting magnet (50) is spaced apart from the first magnetic pole (30), and the first limiting magnet (50) and the first magnetic pole (30) are arranged opposite each other with the same magnetic pole. The second limiting magnet (51) is spaced apart from the second magnetic pole (31), and the second limiting magnet (51) and the second magnetic pole (31) are arranged opposite each other with the same magnetic pole. The first limiting magnet (50) and / or the second limiting magnet (51) have through holes, and the reciprocating shaft (2) passes through the through holes.

3. The reciprocating motor according to claim 2, characterized in that, The accommodating space includes a first subspace (7), a second subspace (8), and a third subspace (9), wherein the second subspace (8), the first subspace (7), and the third subspace (9) are distributed sequentially along a first direction (X); The first limiting magnet (50) is located in the second subspace (8), the second limiting magnet (51) is located in the third subspace (9), and the moving magnet (3) is partially located in the first subspace (7). In the first operating condition, the moving magnet (3) moves toward the second subspace (8), and the distance between the moving magnet (3) and the first limiting magnet (50) decreases; In the second operating condition, the moving magnet (3) moves toward the third subspace (9), and the distance between the moving magnet (3) and the first limiting magnet (50) increases.

4. The reciprocating motor according to claim 3, characterized in that, The diameter of the first subspace (7) is smaller than the diameters of the second subspace (8) and the third subspace (9).

5. The reciprocating motor according to claim 4, characterized in that, Under the first working condition, when the distance between the moving magnet (3) and the first limiting magnet (50) is reduced to the first distance, the moving magnet (3) is stationary relative to the first limiting magnet (50); In the second operating condition, when the distance between the moving magnet (3) and the second limiting magnet (51) is reduced to the second distance, the moving magnet (3) is stationary relative to the second limiting magnet (51).

6. The reciprocating motor according to claim 2, characterized in that, The reciprocating shaft (2) also includes a mounting part (20), the moving magnet (3) is interference-fitted in the mounting part (20), and the outside of the mounting part (20) is clearance-fitted with the inner wall of the housing (1).

7. The reciprocating motor according to claim 6, characterized in that, The reciprocating motor also includes an isolation ring (6), which abuts against the inner wall of the housing (1) and the mounting part (20).

8. The reciprocating motor according to claim 6, characterized in that, The gap between the outside of the mounting part (20) and the inner wall of the housing (1) is filled with a lubricating medium.

9. The reciprocating motor according to claim 3, characterized in that, The housing (1) further includes a recess (10), and the coil body (4) is arranged circumferentially along the recess (10). The recess (10) is used to restrict the movement of the coil body (4) along the first direction (X).

10. An electric appliance, characterized in that, include: Load-bearing components; The reciprocating motor according to any one of claims 1 to 9; The load component is connected to the reciprocating shaft (2) of the reciprocating motor, and the reciprocating motor can drive the load component to reciprocate.

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