Linear motor and hair cutting device

Abstract

The utility model discloses a linear motor and a hair cutting device, the linear motor comprises a base, a stator assembly and two mover assemblies, the stator assembly and the two mover assemblies are arranged on the base, the two mover assemblies are arranged on the base at intervals and are coupled through a connecting assembly, each mover assembly comprises a supporting frame and a permanent magnet fixed on the supporting frame, and the permanent magnet is fixed on the supporting frame. The supporting frame and the base define a containing space to contain the stator assembly, the permanent magnets are located in the containing space, and the stator assembly drives the two permanent magnets to drive the two rotor assemblies to synchronously reciprocate along a straight line. The two rotor assemblies are arranged on the base at intervals and are coupled together through the connecting assembly, so that the two permanent magnets can drive the two rotor assemblies to do linear reciprocating motion under the driving of the stator assembly, and equalization of synchronous motion of the two rotor assemblies is achieved. According to the rotor assembly, the two rotor assemblies can be directly driven to do reciprocating motion, other mechanical structures do not need to be additionally used, and waste in the power transmission process is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a linear motor and a hair shearing device. Background Art

[0002] When a spiral coil is energized, it generates a magnetic field. This magnetic field interacts with a permanent magnet, generating a force that can drive an object to move. This is the basic working principle of a motor. Electric shavers utilize this principle by installing a blade on a motor and driving it to move horizontally and reciprocally, thereby cutting hair.

[0003] Existing technologies primarily utilize two approaches: an eccentric-driven blade motion scheme and a spring-assisted linear motion scheme. The eccentric-driven blade motion scheme, similar to the motion logic of electric hair clippers, utilizes the lateral component motion generated by the eccentric motion of the eccentric wheel to drive the blade reciprocating motion. However, this approach has drawbacks: since power generation primarily relies on the horizontal component force generated by the eccentric wheel, this results in a certain amount of energy waste. Furthermore, due to the inherent limitations of this power transmission method, achieving high torque and shear force is difficult, potentially affecting shaving effectiveness.

[0004] The spring-assisted linear motion solution uses one or more springs to assist the motor mover in achieving the reciprocating motion of the cutter head. This solution also has its drawbacks: when using more than one mover, due to differences in spring performance and load on each mover unit, the relative motion between the movers may not be equal in absolute terms. This can significantly affect motion control and, in actual product use, may result in a poor user experience due to inconsistent motion precision control.

[0005] Therefore existing technology still needs to be improved and improved. Utility Model Content

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a linear motor and a hair clipping device, aiming to solve the problem of poor performance of the motor in the prior art hair clipping device.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A linear motor comprises a base, a stator assembly disposed on the base, and two mover assemblies. The two mover assemblies are spaced apart on the base and coupled via a connecting assembly. The mover assembly comprises a support frame and a permanent magnet fixed to the support frame. The support frame and the base define an accommodating space to accommodate the stator assembly. The permanent magnet is located within the accommodating space. The stator assembly drives the two permanent magnets to drive the two mover assemblies to synchronously reciprocate along a straight line.

[0009] The movable subassembly further comprises a swinging member arranged on the supporting frame, the swinging member being used for mounting a cutter head of the hair cutting device, and the swinging members on the two supporting frames are staggeredly arranged above the supporting frame.

[0010] The connecting assembly includes a first connecting member and a second connecting member, the first connecting member is arranged on one of the support frames, the two ends of the first connecting member extend to form connecting ears, the two connecting ears are relatively arranged on the outside of the other support frame, and the second connecting member is located between the connecting ears and the other support frame; the support frame and the second connecting member are elastic members.

[0011] The first connecting member is an elastic member.

[0012] The second connecting member is a spring, and a mounting portion for mounting the first connecting member is provided on the other supporting frame and the connecting ear.

[0013] The stator assembly includes a stator core and a coil. The stator core is arranged on a base and is a mountain-shaped stator core. The coil is arranged on a middle column of the stator core.

[0014] A magnetic conductive block is arranged between the support frame and the permanent magnet.

[0015] The magnetic poles at both ends of a single permanent magnet are opposite and the magnetic poles at the same end of the two permanent magnets are opposite, so that the two permanent magnets can drive the two mover assemblies to move in parallel and in opposite directions under the drive of the stator assembly.

[0016] Each permanent magnet includes at least one pair of N and S magnetic poles.

[0017] A hair cutting device comprises the linear motor as described above.

[0018] Compared with the prior art, the present invention provides a linear motor and a hair cutting device, wherein the linear motor includes a base, a stator assembly arranged on the base, and two movable subassemblies, the two movable subassemblies are arranged on the base at intervals and coupled by a connecting assembly, the movable subassembly includes a support frame and a permanent magnet fixed on the support frame, the support frame and the base define a storage space to accommodate the stator assembly, the permanent magnet is located in the storage space, and the stator assembly drives the two permanent magnets to drive the two movable subassemblies to reciprocate synchronously along a straight line. The present application arranges the two movable subassemblies at intervals on the base and couples them together through a connecting assembly, so that the two permanent magnets can drive the two movable subassemblies to reciprocate linearly under the drive of the stator assembly, thereby minimizing the influence of the relative motion of the two movable subassemblies due to their own performance differences, and achieving balanced synchronous motion of the two movable subassemblies. In addition, the motor of the present application is based on the principle of magnetic induction and can directly drive the two mover components to perform reciprocating motion without the need for additional mechanical structures, thus avoiding waste in the power transmission process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the linear motor provided by the present invention at one angle.

[0020] Figure 2 This is a schematic structural diagram of the linear motor provided by the utility model from another angle.

[0021] Figure 3 This is a cross-sectional schematic diagram of the linear motor provided by the present utility model.

[0022] Figure 4 This is an exploded schematic diagram of the linear motor and mounting housing provided by the present invention.

[0023] Figure 5 This is a cross-sectional schematic diagram of the linear motor and the mounting housing provided by the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and effect of the present invention more clear and explicit, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] It should be noted that when a component is referred to as being “mounted on,” “fixed on,” or “disposed on” another component, it may be directly on the other component or there may be an intermediate component. When a component is referred to as being “connected to” another component, it may be directly connected to the other component or there may be an intermediate component.

[0026] It should also be noted that the directional terms such as left, right, up, and down in the embodiments of the present invention are merely relative concepts or are based on the normal use status of the product, and should not be considered as restrictive.

[0027] When a spiral coil is energized, it generates a magnetic field. This magnetic field interacts with a permanent magnet, generating a force that can drive an object to move. This is the basic working principle of a motor. Electric shavers utilize this principle by installing a blade on a motor and driving it to move horizontally and reciprocally, thereby cutting hair.

[0028] Existing technologies primarily utilize two approaches: an eccentric-driven blade motion scheme and a spring-assisted linear motion scheme. The eccentric-driven blade motion scheme, similar to the motion logic of electric hair clippers, utilizes the lateral component motion generated by the eccentric motion of the eccentric wheel to drive the blade reciprocating motion. However, this approach has drawbacks: since power generation primarily relies on the horizontal component force generated by the eccentric wheel, this results in a certain amount of energy waste. Furthermore, due to the inherent limitations of this power transmission method, achieving high torque and shear force is difficult, potentially affecting shaving effectiveness.

[0029] The spring-assisted linear motion solution uses one or more springs to assist the motor mover in achieving the reciprocating motion of the cutter head. This solution also has its drawbacks: when using more than one mover, due to differences in spring performance and load on each mover unit, the relative motion between the movers may not be equal in absolute terms. This can significantly affect motion control and, in actual product use, may result in a poor user experience due to inconsistent motion precision control.

[0030] Therefore existing technology still needs to be improved and improved.

[0031] In view of the above shortcomings, this application proposes a linear motor, please refer to Figure 1-Figure 5, comprising a base 1, a stator assembly 2 and two movable subassemblies 3 arranged on the base 1, the two movable subassemblies 3 being arranged at intervals on the base 1 and coupled by a connecting assembly 4, the movable subassembly 3 comprising a support frame and a permanent magnet 33 fixed on the support frame, the support frame and the base 1 defining a receiving space to accommodate the stator assembly 2, the permanent magnet 33 being located within the receiving space, the stator assembly 2 driving the two permanent magnets 33 to drive the two movable subassemblies 3 to synchronously reciprocate along a straight line. In the present application, the two movable subassemblies 3 are arranged at intervals on the base 1 and coupled together by a connecting assembly 4, so that the two permanent magnets 33 can drive the two movable subassemblies 3 to reciprocate along a straight line under the drive of the stator assembly 2, thereby minimizing the influence of the relative motion of the two movable subassemblies 3 due to their own performance differences, and achieving balanced synchronous motion of the two movable subassemblies 3. In addition, the motor of the present application is based on the principle of magnetic induction and can directly drive the two mover assemblies 3 to perform reciprocating motion without the need for additional mechanical structures, thereby avoiding waste in the power transmission process.

[0032] Further, see Figure 1-Figure 4 The movable subassembly 3 further includes a swinging member 34 provided on the support frame, and the swinging member 34 is used to install the cutter head of the hair cutting device. The swinging members 34 on the two support frames are staggered above the support frame.

[0033] In the present application, both support frames are provided with a swinging member 34, and the swinging member 34 is arranged on the support frame through a mounting frame 35. The support frame and the permanent magnet 33 fixed thereon are fixed to the lower end of the mounting frame 35 by screws, and the upper end of the mounting frame 35 is fixed with a swinging member 34. The mounting frame 35 has a Z-shaped structure, and the two mounting frames 35 are arranged in opposite directions. One of the mounting frames 35 is provided with a notch 36 for the other mounting frame 35 to pass through. In the embodiment of the present application, the mounting frame 35 fixed on the second support frame 32 is provided with a notch 36. At the same time, a gap is left in the notch 36 for the reciprocating motion of the swinging member 34 to avoid collision between the two swinging members 34 during the reciprocating motion. The two support frames include a first support frame 31 and a second support frame 32, and the two swing members 34 are staggered on the two support frames through the mounting frame 35, that is, the mounting frame 35 is staggered so that the swing member 34 fixed on the first support frame 31 is located above the second support frame 32, and the swing member 34 fixed on the second support frame 32 is located above the first support frame 31; this design forms a lock-like state in structure. When a fault occurs or a component breaks, the mover assembly 3 can be kept on the motor as a whole. At the same time, the mounting frame 35 increases the length of the force arm, so that the resonant frequency of the mover assembly 3 matches the frequency of the motor drive signal, which makes it easier to form resonance, increase the reciprocating effect of the cutter head, and help improve shaving efficiency and shaving effect.

[0034] Furthermore, the connecting assembly 4 includes a first connecting member 41 and a second connecting member 42, wherein the first connecting member 41 is arranged on one of the support frames, and the two ends of the first connecting member 41 extend to form connecting ears 411, and the two connecting ears 411 are relatively arranged on the outside of the other support frame, and the second connecting member 42 is located between the connecting ears 411 and the other support frame. In the embodiment of the present application, one of the support frames is the first support frame 31, and the other support frame is the second support frame 32. The mounting member is located above the first connecting member 41, and the first connecting member 41 is fixed to the first support frame 31 by screwing. The two ends of the first connecting member 41 are bent downward by 90° to form connecting ears 411, and the connecting ears 411 extend from the two sides of the first support frame 31 to the two sides of the second support frame 32. There are two second connecting members 42, which are relatively arranged on both sides of the second support frame 32. One end of the second connecting member 42 is connected to the side of the second support frame 32, and the other end of the second connecting member 42 is connected to the connecting ear 411. The two support frames are coupled by the first connecting member 41 and the two second connecting members 42 to balance the movement of the two moving subassemblies 3, ensure the balanced movement of the two, and improve the working efficiency of the motor.

[0035] Furthermore, the support frame, the first connecting member 41, and the second connecting member 42 are elastic members. In the present application, since the permanent magnet 33 is fixed to the support frame, the movable subassembly 3 drives the permanent magnet 33 to reciprocate while driving the support frame to reciprocate synchronously. Therefore, during this process, the support frame needs to be able to produce a certain amount of deformation to achieve the reciprocating motion of the two movable subassemblies 3; the first connecting member 41 and the second connecting member 42 are configured as elastic members, and the dynamic coupling of the first support frame 31 and the second support frame 32 is conducive to balancing the movement of the two movable subassemblies 3. At the same time, the elastic deformation of the first connecting member 41 and the second connecting member 42 can avoid the impact caused by poor assembly of the two stator assemblies 2 (such as the permanent magnet 33 being offset from the preset installation position on the mounting surface of the support frame) or differences in their own properties (such as the magnetization amount of the permanent magnet 33).

[0036] Furthermore, the second connecting member 42 is a spring, and the other support frame and the connecting ear 411 are provided with a mounting portion for the first connecting member 41. In the present application, two second connecting members 42 are provided, one on each side of the second support frame 32, and the two connecting ears 411 and both sides of the support frame are provided with mounting portions. The mounting portions are cylindrical, and the ends of the mounting portions on the support frame are provided with chamfers to facilitate the installation of the second connecting member 42. The mounting portions on the connecting ears 411 are not provided with chamfers, which plays a guiding role, facilitating the reciprocating movement of the two stator assemblies 2 along the setting direction of the mounting portions, while preventing the second connecting member 42 from slipping off the mounting portions on the connecting ears 411.

[0037] Further, please refer again to Figure 1-Figure 5The stator assembly 2 includes a stator core 21 and a coil 22. The stator core 21 is disposed on the base 1 and is in a mountain-shaped configuration. The coil 22 is disposed on the middle column of the stator core 21. During use, current flows through the coil 22, generating a magnetic effect that acts on the permanent magnet 33, prompting the two movable subassemblies 3 to perform interlaced reciprocating motion. During this process, the support frame, the first connecting member 41, and the second connecting member 42 will also deform to ensure the stability of the two movable subassemblies 3 during the interlaced movement and to balance the movement of the two movable subassemblies 3. With the current direction inside the coil 22, the two movable subassemblies 3 move in opposite directions, and so on, thereby achieving interlaced reciprocating motion of the two movable subassemblies 3. It should be noted that the lower ends of the two mover assemblies 3 are fixed on the base 1, and the base 1 is fixed to the mounting shell 6 of the hair cutting device by bolts 61. A cavity for installing the linear motor is provided in the mounting shell 6. Since the support frame is an elastic member, the staggered reciprocating movement is actually the reciprocating swing of the upper end of the mover assembly 3. In addition, fixing the base 1 in the mounting shell 6 ensures that the base 1 and the stator assembly 2 are in a stable state during the operation of the linear motor. At the same time, the movement of the mover assembly 3 can be limited by the mounting shell 6 to avoid excessive movement of the mover assembly 3 and ensure damage to the linear motor.

[0038] Furthermore, a magnetic block 5 is disposed between the support frame and the permanent magnet 33. The magnetic block 5 enhances the magnetic field produced by the permanent magnet 33. Due to its high magnetic permeability, the magnetic block 5 effectively guides the magnetic field lines, making the field more concentrated and stable. This helps the linear motor generate greater thrust and higher efficiency, thereby increasing the movement of the two mover assemblies 3 and improving hair cutting efficiency. By optimizing the magnetic field distribution and enhancing the magnetic field effect, the magnetic block 5 also helps reduce energy loss and heat generation in the linear motor. Because less magnetic energy is wasted in magnetic field leakage or ineffective magnetic flux, the linear motor achieves higher efficiency and generates less heat, which helps extend its service life.

[0039] Furthermore, the magnetic poles at both ends of a single permanent magnet 33 are opposite, and the magnetic poles of the two permanent magnets 33 at the same end are opposite, so that the two permanent magnets 33 can drive the two mover assemblies 3 to move in parallel and opposite directions under the drive of the stator assembly 2. The opposite magnetic poles at both ends of a single permanent magnet 33 enable the stator assembly 2 to drive the permanent magnet 33 to reciprocate, and the opposite magnetic poles of the two permanent magnets 33 at the same end enable the stator assembly 2 to drive the two permanent magnets 33 to move in parallel and opposite directions.

[0040] Furthermore, each permanent magnet 33 includes at least one pair of N and S poles. In the present application, the magnetic poles on the permanent magnet 33 can be set as one or more pairs. For example, the magnetic poles of the permanent magnet 33 on the first support frame 31 are set to NS, and the magnetic poles of the corresponding permanent magnet 33 on the second support frame 32 are SN. Of course, the magnetic poles of the permanent magnet 33 on the first support frame 31 can also be set to NSNS, and the magnetic poles on the corresponding second permanent magnet 33 are set to SNSN. In any case, the magnetic poles on the same end of the permanent magnet 33 on the first support frame 31 and the permanent magnet 33 on the second support frame 32 are opposite to ensure that the stator assembly 2 can drive the movable assembly 3 to move in parallel and in opposite directions. The permanent magnets 33 are designed and arranged according to the above requirements so that when the coil 22 is energized, the two movable assemblies 3 will achieve parallel and opposite motion. Due to the differences in the properties of individual components in actual production, when the relative motion of the two mover assemblies 3 differs, the coupling of the two mover assemblies 3 via the first connector 41 and the second connector 42 balances the relative motion between the two mover assemblies 3, thereby improving the motor's operating efficiency. Furthermore, when the permanent magnets 33 are provided with multiple pairs of magnetic poles, the stator assembly 2 facilitates better movement of the mover assemblies 3, improving the efficiency of the mover assemblies 3 and the stability of their reciprocating motion.

[0041] The present invention also relates to a hair cutting device comprising the aforementioned linear motor, which is equipped with a hair cutting head. The hair cutting device may be a shaver, hair clipper, trimmer, or the like, without limitation. The hair cutting device herein couples two moving subassemblies 3, each of which is mounted on a linear motor, with the cutting head mounted thereon via a connecting assembly 4, thereby achieving relatively balanced reciprocating motion between the two cutting heads, improving hair cutting efficiency and stability, and enhancing the user experience.

[0042] In summary, the present invention provides a linear motor and a hair cutting device, wherein the linear motor includes a base, a stator assembly and two movable subassemblies arranged on the base, the two movable subassemblies are arranged on the base at intervals and coupled by a connecting assembly, the movable subassembly includes a support frame and a permanent magnet fixed on the support frame, the support frame and the base define a storage space to accommodate the stator assembly, the permanent magnet is located in the storage space, and the stator assembly drives the two permanent magnets to drive the two movable subassemblies to reciprocate synchronously along a straight line. The present application arranges the two movable subassemblies on the base at intervals and couples them together through a connecting assembly, so that the two permanent magnets can drive the two movable subassemblies to reciprocate linearly under the drive of the stator assembly, thereby minimizing the influence of the relative motion of the two movable subassemblies due to their own performance differences, and achieving balanced synchronous motion of the two movable subassemblies. In addition, the motor of the present application is based on the principle of magnetic induction and can directly drive the two mover components to perform reciprocating motion without the need for additional mechanical structures, thus avoiding waste in the power transmission process.

[0043] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and utility model concept of the present invention, and all these changes or substitutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A linear motor, characterized in that: It includes a base, a stator assembly arranged on the base, and two mover assemblies. The two mover assemblies are arranged on the base at intervals and coupled by a connecting assembly. The mover assembly includes a support frame and a permanent magnet fixed to the support frame. The support frame and the base define an accommodating space to accommodate the stator assembly. The permanent magnet is located in the accommodating space. The stator assembly drives the two permanent magnets to drive the two mover assemblies to reciprocate synchronously along a straight line.

2. The linear motor according to claim 1, characterized in that The movable subassembly further comprises a swinging member arranged on the supporting frame, the swinging member being used for mounting a cutter head of the hair cutting device, and the swinging members on the two supporting frames are staggeredly arranged above the supporting frame.

3. The linear motor according to claim 2, characterized in that The connecting assembly includes a first connecting member and a second connecting member, the first connecting member is arranged on one of the support frames, the two ends of the first connecting member extend to form connecting ears, the two connecting ears are relatively arranged on the outside of the other support frame, and the second connecting member is located between the connecting ears and the other support frame; the support frame and the second connecting member are elastic members.

4. The linear motor according to claim 3, characterized in that The first connecting member is an elastic member.

5. The linear motor according to claim 3 or 4, characterized in that: The second connecting member is a spring, and a mounting portion for mounting the first connecting member is provided on the other supporting frame and the connecting ear.

6. The linear motor according to claim 1, characterized in that The stator assembly includes a stator core and a coil. The stator core is arranged on a base and is a mountain-shaped stator core. The coil is arranged on a middle column of the stator core.

7. The linear motor according to claim 1, wherein A magnetic conductive block is arranged between the support frame and the permanent magnet.

8. The linear motor according to claim 1, wherein The magnetic poles at both ends of a single permanent magnet are opposite and the magnetic poles at the same end of the two permanent magnets are opposite, so that the two permanent magnets can drive the two mover assemblies to move in parallel and in opposite directions under the drive of the stator assembly.

9. The linear motor according to claim 8, characterized in that Each permanent magnet includes at least one pair of N and S magnetic poles.

10. A hair cutting device, characterized in that: The linear motor comprises the linear motor as claimed in any one of claims 1 to 9.

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