Linear motor

Abstract

The utility model discloses a linear motor, and relates to the technical field of motor manufacturing, the linear motor comprises a housing, a stator assembly, a rotor assembly and a buffer member, and the housing is provided with a through hole; the stator assembly is annularly arranged on the inner circumferential wall of the shell, and the stator assembly and the shell define a movement cavity communicating with the through hole. The mover assembly comprises a mover rod and a magnetic ring group, and the mover rod is in sliding connection with the hole wall of the through hole; the magnetic ring group sleeves the rotor rod and is positioned in the motion cavity; the buffer part is used for abutting against the magnetic ring group; wherein an elastic arm is convexly arranged on the peripheral wall, facing the movement cavity, of the shell, and the elastic arm is propped against one side, back on to the magnetic ring group, of the buffer piece. According to the technical scheme, when the mover rod reciprocates, the magnetic ring set makes contact with the buffering piece, the elastic arm can support the buffering piece, the buffering piece is prevented from colliding with the shell, and therefore the damping and noise reduction effects are achieved; and the elastic arm and the buffer piece are not easy to deform and lose efficacy under long-term impact, so that the influence on the service life of the linear motor can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of motor manufacturing technology, and in particular to a linear motor. Background Technology

[0002] Linear motors, as a type of direct-drive motor, are widely used in precision positioning, high-speed motion, and automated equipment. Their working principle involves directly converting electrical energy into linear motion through the electromagnetic interaction between the mover and stator. However, during operation, the reciprocating motion of the mover can cause vibration and noise problems.

[0003] Currently, common methods for damping and reducing noise in linear motors mainly utilize the tensile strength of silicone. However, due to the limitations of silicone material, it is prone to aging and deformation over long-term use, which gradually weakens the damping and noise reduction effect of the linear motor, thus affecting its lifespan. Utility Model Content

[0004] The main purpose of this invention is to propose a linear motor that aims to reduce the impact on the service life of the linear motor while achieving the effect of vibration reduction and noise reduction.

[0005] To achieve the above objectives, the linear motor proposed in this utility model includes:

[0006] The outer casing has through holes;

[0007] A stator assembly is arranged around the inner peripheral wall of the housing and surrounds the housing to form a moving cavity communicating with the through hole;

[0008] A moving part assembly, comprising a moving part rod and a magnetic ring assembly, wherein the moving part rod is slidably connected to the wall of the through hole; the magnetic ring assembly is sleeved on the moving part rod and located within the moving cavity; and

[0009] A buffer element is disposed on the outer shell and is used to abut against the magnetic ring assembly;

[0010] The outer shell has a spring arm protruding from its peripheral wall facing the motion cavity, and the spring arm abuts against the side of the buffer member facing away from the magnetic ring assembly.

[0011] In one embodiment, the elastic arm gradually contracts along the direction extending from the end of the elastic arm away from the buffer towards the end closer to the buffer.

[0012] In one embodiment, the through hole includes an abutment section and a mounting section, the abutment section communicating with the mounting section; the moving rod is slidably connected to the inner wall of the abutment section, and the inner diameter of the mounting section is larger than the inner diameter of the abutment section;

[0013] The linear motor also includes a steel sleeve, which is fitted onto the moving rod and slidably connected to the inner wall of the mounting section.

[0014] In one embodiment, the stator assembly includes a spacer ring and two coil groups, the spacer ring and the two coil groups being arranged around the inner peripheral wall of the housing, the spacer ring, the two coil groups and the housing forming the motion cavity; the two coil groups respectively abut against the front and rear ends of the spacer ring along the movement direction of the mover.

[0015] In one embodiment, each coil group includes a positioning ring and two coils, the outer peripheral wall of the positioning ring abutting against the inner peripheral wall of the housing, and the two coils abutting against the front and rear ends of the positioning ring along the movement direction of the mover.

[0016] In one embodiment, the magnetic ring assembly includes a magnetic ring spacer and two magnetic rings, both of which are sleeved on the moving rod and respectively abut against the front and rear ends of the magnetic ring spacer along the moving direction of the moving rod.

[0017] In one embodiment, the length of the coil group extending along the direction of motion of the mover is defined as L, the length of the magnetic ring extending along the direction of motion of the mover is defined as l1, and the length of the magnetic ring spacer extending along the direction of motion of the mover is defined as l2, where l1+l2≥L.

[0018] In one embodiment, the linear motor includes two buffers. The housing has a through hole and a spring arm formed at both ends along the movement direction of the mover. The mover rod is slidably connected to the walls of the two through holes, and each buffer abuts against a spring arm.

[0019] In one embodiment, the outer casing includes a cylindrical body and a rear cover, the rear cover being detachably connected to the cylindrical body, the rear cover forming a through hole and a spring arm, and the cylindrical body having a through hole and a spring arm at one end away from the rear cover.

[0020] In one embodiment, the buffer is felt.

[0021] In the technical solution of this utility model, the linear motor includes a housing, a stator assembly, a mover assembly, and a buffer. The housing has a through hole. The stator assembly is arranged around the inner peripheral wall of the housing and surrounds the housing to form a motion cavity communicating with the through hole. The mover assembly includes a mover rod and a magnetic ring assembly. The mover rod is slidably connected to the hole wall of the through hole. The magnetic ring assembly is sleeved on the mover rod and located in the motion cavity. The buffer is disposed on the housing and is used to abut against the magnetic ring assembly. The peripheral wall of the housing facing the motion cavity has a protruding elastic arm, which abuts against the side of the buffer assembly facing away from the magnetic ring assembly. In the technical solution of this utility model, when the magnetic ring assembly is subjected to the magnetic field of the stator assembly, it can drive the mover rod to reciprocate along the direction of the mover's movement. A spring arm protrudes from the peripheral wall of the outer shell facing the moving cavity, and a buffer abuts against the spring arm. When the mover rod reciprocates, the magnetic ring assembly contacts the buffer, and the contact between the spring arm and the buffer can support the buffer, preventing the buffer from hitting the outer shell under the drive of the magnetic ring assembly, thereby achieving the vibration reduction and noise reduction effect of the linear motor. The combined structure of the spring arm and the buffer is not easily deformed or failed under the long-term impact of the mover assembly, thus reducing the impact on the service life of the linear motor. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of an embodiment of the linear motor provided by this utility model;

[0024] Figure 2 This is a schematic diagram of the stator assembly in a linear motor;

[0025] Figure 3 This is a schematic diagram of the mover assembly in a linear motor.

[0026] Explanation of icon numbers:

[0027]

[0028]

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] This utility model proposes a linear motor 1000.

[0034] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the linear motor 1000 includes a housing 1, a stator assembly 2, a mover assembly 3, and a buffer 4. The housing 1 has a through hole 1a. The stator assembly 2 is arranged around the inner peripheral wall of the housing 1 and surrounds the housing 1 to form a motion cavity 2a communicating with the through hole 1a. The mover assembly 3 includes a mover rod 31 and a magnetic ring assembly 32. The mover rod 31 is slidably connected to the hole wall of the through hole 1a. The magnetic ring assembly 32 is sleeved on the mover rod 31 and located in the motion cavity 2a. The buffer 4 is disposed on the housing 1 and is used to abut against the magnetic ring assembly 32. A spring arm 13 is protruding from the peripheral wall of the housing 1 facing the motion cavity 2a, and the spring arm 13 abuts against the side of the buffer 4 facing away from the magnetic ring assembly 32.

[0035] In the technical solution of this utility model, when the magnetic ring assembly 32 is subjected to the magnetic field of the stator assembly 2, it can drive the mover rod 31 to reciprocate along the mover movement direction. A spring arm 13 is protruding from the peripheral wall of the outer shell 1 facing the motion cavity 2a, and then the buffer member 4 abuts against the spring arm 13. When the mover rod 31 reciprocates, the magnetic ring assembly 32 contacts the buffer member 4. The abutment between the spring arm 13 and the buffer member 4 can support the buffer member 4, preventing the buffer member 4 from hitting the outer shell 1 under the drive of the magnetic ring assembly 32, thereby achieving the vibration reduction and noise reduction effect of the linear motor 1000. The combined structure of the spring arm 13 and the buffer member 4 is not easy to deform and fail under the long-term impact of the mover assembly 3, thus reducing the impact on the service life of the linear motor 1000.

[0036] Specifically, the outer shell 1 and the elastic arm 13 can be integrally formed or detachably connected. If the outer shell 1 and the elastic arm 13 are detachably connected, the material used for the elastic arm 13 is the same as the material used for the outer shell 1. For example, if the outer shell 1 is made of plastic, then the elastic arm 13 is also made of plastic; if the outer shell 1 is made of metal, then the elastic arm 13 is a metal spring.

[0037] In one embodiment of this utility model, the elastic arm 13 gradually contracts along the direction extending from the end of the elastic arm 13 away from the buffer member 4 toward the end closer to the buffer member 4. The top of the elastic arm 13 is pointed, which can effectively reduce the contact area between the elastic arm 13 and the buffer member 4. This design can further improve the shock absorption and noise reduction effect of both the elastic arm 13 and the buffer member 4, thereby further reducing the noise generated by the linear motor 1000.

[0038] In one embodiment of this utility model, the through hole 1a includes an abutment section 1a1 and an installation section 1a2, with the abutment section 1a1 communicating with the installation section 1a2. The moving rod 31 is slidably connected to the inner wall of the abutment section 1a1, and the inner diameter of the installation section 1a2 is larger than the inner diameter of the abutment section 1a1. The linear motor 1000 also includes a steel sleeve 5, which is fitted onto the moving rod 31 and slidably connected to the inner wall of the installation section 1a2. The inner diameter of the installation section 1a2 being larger than the inner diameter of the abutment section 1a1 provides installation space for the steel sleeve 5. The steel sleeve 5 being fitted onto the moving rod 31 and slidably connected to the inner wall of the installation section 1a2 enhances the connection stability between the moving rod 31 and the outer shell 1, thereby ensuring the smoothness of the movement of the moving rod 31. At the same time, the steel sleeve 5 can effectively reduce the direct friction between the moving rod 31 and the outer shell 1, reduce the noise generated by friction, avoid direct wear between the moving rod 31 and the outer shell 1, reduce the risk of component damage, and thus extend the service life of the linear motor 1000.

[0039] In one embodiment of this utility model, the stator assembly 2 includes a spacer ring 22 and two coil groups 21. The spacer ring 22 and the two coil groups 21 are both arranged around the inner peripheral wall of the outer shell 1. The spacer ring 22, the two coil groups 21, and the outer shell 1 enclose a motion cavity 2a. The two coil groups 21 respectively abut against the front and rear ends of the spacer ring 22 along the movement direction of the mover. The coil group 21 includes the spacer ring 22 and the two coil groups 21. The layout of the spacer ring 22 and the coil groups 21 can optimize the magnetic field distribution, ensure that the mover assembly 3 is subjected to uniform force during movement, and improve the operating efficiency of the linear motor 1000.

[0040] In one embodiment of this utility model, each coil group 21 includes a positioning ring 212 and two coils 211. The outer peripheral wall of the positioning ring 212 abuts against the inner peripheral wall of the outer shell 1, and the two coils 211 abut against the front and rear ends of the positioning ring 212 along the movement direction of the mover, respectively. By fixing the two coils 211 in each coil group 21 with the positioning ring 212, the air gap of the coil group 21 in the linear motor 1000 can be reduced, the magnetic field utilization rate can be improved, the power loss can be reduced, and thus the efficiency and thrust of the linear motor 1000 can be improved.

[0041] In one embodiment of this utility model, the magnetic ring assembly 32 includes a magnetic ring spacer 322 and two magnetic rings 321. Both magnetic rings 321 are sleeved on the mover rod 31 and respectively abut against the front and rear ends of the magnetic ring spacer 322 along the direction of the mover's movement. By setting the magnetic ring spacer 322 and the two magnetic rings 321, the problem of unstable position of the magnetic rings 321 during the operation of the linear motor 1000 is effectively solved. The presence of the magnetic ring spacer 322 allows the two magnetic rings 321 to maintain a fixed distance, thereby ensuring the uniformity of magnetic force distribution and reducing the generation of vibration and noise in the linear motor 1000.

[0042] Please see Figure 2 and Figure 3 In one embodiment of this utility model, the length of the coil group 21 extending along the direction of movement of the mover is defined as L, the length of the magnetic ring 321 extending along the direction of movement of the mover is defined as l1, and the length of the magnetic ring spacer 322 extending along the direction of movement of the mover is defined as l2, where l1 + l2 ≥ L. This arrangement ensures that each magnetic ring 321 reciprocates within the range of its corresponding coil group 21, ensuring that each magnetic ring 321 maintains effective electromagnetic interaction with its corresponding coil group 21. This prevents the front magnetic ring 321 from entering the magnetic field range of the rear coil group 21 or vice versa, thereby avoiding mutual interference between the front and rear magnetic rings 321 and the coil group 21 and improving the operational stability of the linear motor 1000.

[0043] In one embodiment of this utility model, the linear motor 1000 includes two buffer members 4. The outer casing 1 has a through hole 1a and a spring arm 13 formed at both ends along the movement direction of the mover. The mover rod 31 is slidably connected to the walls of the two through holes 1a, and each buffer member 4 abuts against a spring arm 13. The combination structure of the spring arm 13 and the buffer member 4 at both ends of the reciprocating motion of the mover rod 31 effectively absorbs impacts in both directions during the reciprocating motion of the mover rod 31, thereby further improving the shock absorption effect and making the linear motor 1000 have better vibration reduction and noise reduction performance.

[0044] In one embodiment of this utility model, the outer casing 1 includes a cylindrical body 11 and a rear cover 12. The rear cover 12 is detachably connected to the cylindrical body 11. The rear cover 12 forms a through hole 1a and a spring arm 13. The end of the cylindrical body 11 away from the rear cover 12 also forms a through hole 1a and a spring arm 13. The outer casing 1 is composed of the cylindrical body 11 and the rear cover 12, and the rear cover 12 is detachably connected to the cylindrical body 11, which makes the assembly and disassembly of the linear motor 1000 more convenient, and also facilitates subsequent maintenance and component replacement.

[0045] It is understood that the buffer 4 can be felt or polyurethane foam. In one embodiment of this utility model, the buffer 4 is felt. As a common buffer material, felt has good elasticity and wear resistance, and can effectively absorb the vibration and impact generated by the moving part 3 during movement. The felt material is soft and has a certain degree of compressibility, which can provide a stable buffering effect when it comes into contact with the magnetic ring assembly 32, thereby reducing the generation of vibration and noise. In addition, felt has good durability and can maintain its buffering performance during long-term use, avoiding the decrease in shock absorption effect due to material aging. In summary, felt is preferred as the buffer 4.

[0046] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A linear motor (1000) characterized by, include: The outer casing (1) has a through hole (1a); Stator assembly (2), the stator assembly (2) is arranged around the inner peripheral wall of the outer shell (1) and surrounds the outer shell (1) to form a motion cavity (2a) communicating with the through hole (1a); A moving part assembly (3) comprising a moving part rod (31) and a magnetic ring assembly (32), wherein the moving part rod (31) is slidably connected to the wall of the through hole (1a); the magnetic ring assembly (32) is sleeved on the moving part rod (31) and located within the motion cavity (2a); and A buffer (4) is disposed on the outer shell (1) and is used to abut against the magnetic ring assembly (32); The outer shell (1) has a spring arm (13) protruding from its peripheral wall facing the motion cavity (2a), and the spring arm (13) abuts against the side of the buffer (4) facing away from the magnetic ring assembly (32).

2. The linear motor (1000) of claim 1, characterized in that, The elastic arm (13) gradually contracts along the direction from the end of the elastic arm (13) away from the buffer (4) toward the end closer to the buffer (4).

3. The linear motor (1000) of claim 2, wherein The through hole (1a) includes an abutment section (1a1) and an installation section (1a2), the abutment section (1a1) and the installation section (1a2) are connected; the moving rod (31) is slidably connected to the inner wall of the abutment section (1a1), and the inner diameter of the installation section (1a2) is larger than the inner diameter of the abutment section (1a1); The linear motor (1000) also includes a steel sleeve (5), which is fitted onto the moving rod (31) and slidably connected to the inner wall of the mounting section (1a2).

4. The linear motor (1000) of claim 1, wherein The stator assembly (2) includes a spacer ring (22) and two coil groups (21). The spacer ring (22) and the two coil groups (21) are both arranged around the inner peripheral wall of the outer shell (1). The spacer ring (22), the two coil groups (21) and the outer shell (1) enclose the motion cavity (2a). The two coil groups (21) respectively abut against the front and rear ends of the spacer ring (22) along the direction of movement of the stator.

5. The linear motor (1000) of claim 4, characterized in that, Each coil group (21) includes a positioning ring (212) and two coils (211). The outer peripheral wall of the positioning ring (212) abuts against the inner peripheral wall of the outer shell (1), and the two coils (211) abut against the front and rear ends of the positioning ring (212) along the direction of movement of the mover.

6. The linear motor (1000) of claim 4, wherein The magnetic ring assembly (32) includes a magnetic ring spacer (322) and two magnetic rings (321). The two magnetic rings (321) are both sleeved on the moving rod (31) and respectively abut against the front and rear ends of the magnetic ring spacer (322) along the moving direction.

7. The linear motor (1000) of claim 6, characterized in that, The length of the coil group (21) extending along the direction of motion of the mover is defined as L, the length of the magnetic ring (321) extending along the direction of motion of the mover is defined as l1, and the length of the magnetic ring spacer post (322) extending along the direction of motion of the mover is defined as l2, where l1+l2≥L.

8. The linear motor (1000) as described in any one of claims 1 to 7, characterized in that, The linear motor (1000) includes two buffers (4). The outer shell (1) has a through hole (1a) and a spring arm (13) at both ends along the moving direction of the mover. The mover rod (31) is slidably connected to the hole walls of the two through holes (1a). Each buffer (4) abuts against a spring arm (13).

9. The linear motor (1000) of claim 8, characterized in that, The outer casing (1) includes a cylindrical body (11) and a rear cover (12). The rear cover (12) is detachably connected to the cylindrical body (11). The rear cover (12) forms a through hole (1a) and a spring arm (13). The cylindrical body (11) at one end away from the rear cover (12) forms a through hole (1a) and a spring arm (13).

10. The linear motor (1000) according to any one of claims 1 to 7, characterized in that The buffer (4) is felt.

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