Linear motor
By employing a combination of springs and felt in the linear motor to buffer the shock absorption, the problem of reduced vibration reduction under high thrust conditions was solved, achieving good vibration reduction and noise reduction effects and stability, and extending service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-03-31
AI Technical Summary
The vibration damping effect of linear motors decreases significantly under high thrust conditions, and noise is difficult to reduce effectively.
The system employs a combination of springs and felt for cushioning. The springs and felt absorb the impact force of the moving part assembly, while the steel sleeve and snap-fit structure enhance stability and improve shock absorption.
Under high thrust conditions, it effectively absorbs the impact force of the mover assembly, reduces noise, improves vibration damping and operational stability, and extends service life.
Smart Images
Figure CN224068524U_ABST
Abstract
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] Typical linear motors are equipped with shock absorbers or springs at both ends. The reciprocating motion of the moving part impacts these shock absorbers or springs, cushioning the impact of the moving part on the housing and thus reducing noise. This type of cushioning structure achieves good vibration and noise reduction even with relatively low moving part thrust.
[0004] However, when the thrust of the moving part structure is large, the damping capacity of the shock absorber or spring is obviously insufficient, and the damping effect of the moving part structure will decrease significantly, making it difficult to effectively reduce the noise of the linear motor. Utility Model Content
[0005] The main purpose of this invention is to propose a linear motor that aims to improve the vibration reduction and noise reduction effect of the linear motor under high thrust conditions.
[0006] To achieve the above objectives, the linear motor proposed in this utility model includes:
[0007] The outer casing has through holes;
[0008] A coil 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;
[0009] 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
[0010] A buffer assembly, comprising a spring and a felt, wherein the spring abuts against the magnetic ring assembly; the felt is disposed on the inner periphery of the through hole and is used to abut against the spring.
[0011] In one embodiment, the outer casing has through holes at both the front and rear ends along the direction of movement of the moving rod. The buffer assembly includes two springs and two felts. The two springs abut against the front and rear ends of the magnetic ring assembly along the direction of movement of the moving rod, respectively. Each felt is disposed on the inner periphery of one of the through holes and is used to abut against the spring located at the same end in the outer casing.
[0012] In one embodiment, the outer casing has snap-fit structures at both its front and rear ends along the direction of movement of the moving rod. The snap-fit structures include an inner ring and an outer ring, with the inner ring connected to the outer ring.
[0013] Each of the inner rings forms a through hole, and each of the springs is sleeved on one of the inner rings.
[0014] In one embodiment, each inner ring and the corresponding outer ring enclose each other to form a mounting ring groove, and each felt ring is disposed in a mounting ring groove.
[0015] In one embodiment, the outer peripheral wall of the felt abuts against the inner wall of the outer ring, and the inner peripheral wall of the felt abuts against the outer peripheral wall of the inner ring.
[0016] 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 having one of the aforementioned snap-fit structures, and the cylindrical body having another snap-fit structure at one end away from the rear cover.
[0017] 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;
[0018] 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.
[0019] In one embodiment, the coil 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 moving rod.
[0020] 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 moving rod, respectively.
[0021] In one embodiment, the magnetic ring assembly includes a magnetic ring spacer and two magnetic ring components. Both magnetic ring components are sleeved on the moving rod and respectively abut against the front and rear ends of the magnetic ring spacer along the direction of movement of the moving rod.
[0022] The length of the coil group extending along the direction of movement of the moving rod is defined as L, the length of the magnetic ring extending along the direction of movement of the moving rod is defined as l1, and the length of the magnetic ring spacer extending along the direction of movement of the moving rod is defined as l2, where l1+l2≥L.
[0023] In the technical solution of this utility model, the linear motor includes a housing, a coil assembly, a mover assembly, and a buffer assembly. The housing has a through hole. The coil assembly is arranged around the inner peripheral wall of the housing and forms 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 wall of the through hole. The magnetic ring assembly is sleeved on the mover rod and located inside the motion cavity. The buffer assembly includes a spring and a felt. The spring abuts against the magnetic ring assembly. The felt is located on the inner periphery of the through hole and abuts against the spring. In the technical solution of this utility model, by setting a combined buffer structure of spring and felt, when the magnetic ring assembly drives the mover rod to move back and forth in the motion cavity, the spring and felt can effectively absorb the impact force of the mover assembly, thereby avoiding a significant decrease in the vibration reduction effect of the mover assembly and enabling the linear motor to achieve good vibration reduction and noise reduction effects even under high thrust conditions. Attached Figure Description
[0024] 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.
[0025] Figure 1 A schematic diagram of the structure of an embodiment of the linear motor provided by this utility model;
[0026] Figure 2 This is a schematic diagram of the rear cover structure in a linear motor.
[0027] Explanation of icon numbers:
[0028]
[0029]
[0030] 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
[0031] 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.
[0032] 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.
[0033] 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.
[0034] To address the aforementioned problems, this invention proposes a linear motor 1000, which aims to achieve good vibration reduction and noise reduction even when the linear motor 1000 has a large thrust. Figure 1 and Figure 2 This is a schematic diagram of one embodiment of the linear motor 1000 of this utility model.
[0035] Please refer to Figure 1 and Figure 2This utility model proposes a linear motor 1000, including a housing 1, a coil assembly 2, a mover assembly, and a buffer assembly. The housing 1 has a through hole 1a. The coil assembly 2 is arranged around the inner peripheral wall of the housing 1 and surrounds the housing 1 to form a motion cavity 1b communicating with the through hole 1a. The mover assembly 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 1b. The buffer assembly includes a spring 41 and a felt 42. The spring 41 abuts against the magnetic ring assembly 32. The felt 42 is disposed on the inner peripheral edge of the through hole 1a and is used to abut against the spring 41. In the technical solution of this utility model, after the coil assembly 2 is energized, the current flowing through the coil assembly 2 generates a magnetic field, which drives the magnetic ring assembly 32 to move through the electromagnetic effect. The magnetic ring assembly 32 is sleeved on the moving rod 31. The movement of the magnetic ring assembly 32 can drive the moving rod 31 to move. The user can achieve the reciprocating motion of the moving rod 31 by changing the direction of the current flow. The moving rod 31 reciprocates through the through hole 1a. The felt 42 is provided on the inner periphery of the through hole 1a. When the moving rod 31 reciprocates, the other end of the spring 41 that abuts against the magnetic ring assembly 32 can contact the felt 42. Through the buffer structure of the combination of spring 41 and felt 42, when the magnetic ring assembly 32 drives the moving rod 31 to move back and forth in the motion cavity 1b, the spring 41 and felt 42 can effectively absorb the impact force of the moving assembly, thereby avoiding a significant decrease in the shock absorption effect of the moving assembly, so that the linear motor 1000 can achieve good shock absorption and noise reduction effect even under high thrust conditions.
[0036] It should be noted that in one embodiment of this utility model, the spring 41 is always magnetically attracted by the magnetic ring group 32, so that the spring 41 can follow the movement of the magnetic ring group 32, thus avoiding the collision between the spring 41 and the magnetic ring group 32 during the reciprocating motion of the moving part assembly and thus avoiding noise.
[0037] It is understandable that through holes 1a can be opened at both ends of the outer shell 1, or through holes 1a can be opened at only one end of the outer shell 1. It should be noted that the buffer components are set in correspondence with the through holes 1a opened in the outer shell 1; for example, if through holes 1a are opened at both ends of the outer shell 1, felt 42 is set on the inner periphery of both through holes 1a, and springs 41 are set at both ends of the magnetic ring assembly 32 to cooperate with the felt 42 at both ends.
[0038] In one embodiment of this utility model, the outer casing 1 has through holes 1a at both the front and rear ends along the movement direction of the moving rod 31. The buffer assembly includes two springs 41 and two felts 42. The two springs 41 respectively abut against the front and rear ends of the magnetic ring assembly 32 along the movement direction of the moving rod 31. Each felt 42 is located on the inner periphery of a through hole 1a and is used to abut against the spring 41 located at the same end in the outer casing 1. The buffer structure composed of springs 41 and felts 42 is provided at both the front and rear ends of the reciprocating movement of the moving rod 31, which can effectively absorb the impact in both directions during the reciprocating movement of the moving rod 31, thereby further improving the shock absorption effect and making the vibration reduction and noise reduction effect of the linear motor 1000 better.
[0039] In one embodiment of this utility model, the outer shell 1 has a snap-fit structure 11 at both ends along the movement direction of the moving rod 31. The snap-fit structure 11 includes an inner ring 111 and an outer ring 112, with the inner ring 111 connected to the outer ring 112. Each inner ring 111 has a through hole 1a, and each spring 41 is sleeved on an inner ring 111. One end of the spring 41 abuts against the magnetic ring assembly 32, and the other end is sleeved on the inner ring 111, so that the spring 41 can be limited by the inner ring 111 when it reciprocates with the magnetic ring assembly 32, preventing the spring 41 from shaking during reciprocating motion and failing to accurately align with the felt 42, thereby ensuring stable contact between the spring 41 and the felt 42 during reciprocating motion, thus improving the stability of the shock absorption of the spring 41 and the felt 42.
[0040] In one embodiment of this utility model, each inner ring 111 and the corresponding outer ring 112 enclose a mounting ring groove 11a, and each felt 42 is disposed within a mounting ring groove 11a. The inner ring 111 and the corresponding outer ring 112 enclose a mounting ring groove 11a, and the felt 42 is disposed within the mounting ring groove 11a, making the installation of the felt 42 more stable and preventing the felt 42 from moving or falling off during the movement of the moving part assembly. This further improves the alignment accuracy of the spring 41 and the felt 42, thereby improving the stability of the linear motor 1000 in achieving vibration reduction and noise reduction effects.
[0041] In one embodiment of this utility model, the outer peripheral wall of the felt 42 abuts against the inner wall of the outer ring 112, and the inner peripheral wall of the felt 42 abuts against the outer peripheral wall of the inner ring 111. This tight abutment ensures a more stable installation of the felt 42, preventing displacement or detachment of the felt 42 during the movement of the mover assembly, thereby further improving the reliability of the linear motor 1000's vibration and noise reduction under high thrust conditions.
[0042] In one embodiment of this utility model, the outer casing 1 includes a cylindrical body 12 and a rear cover 13. The rear cover 13 is detachably connected to the cylindrical body 12 and has a snap-fit structure 11. Another snap-fit structure 11 is formed at the end of the cylindrical body 12 away from the rear cover 13. The outer casing 1 is composed of the cylindrical body 12 and the rear cover 13, and the rear cover 13 is detachably connected to the cylindrical body 12, which makes the assembly and disassembly of the linear motor 1000 more convenient, and also facilitates subsequent maintenance and component replacement.
[0043] 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.
[0044] In one embodiment of this utility model, the coil 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 1b. 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 rod 31. The coil assembly 2 includes a spacer ring 22 and 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 is subjected to uniform force during movement, and improve the operating efficiency of the linear motor 1000.
[0045] 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 moving rod 31, 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 of 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.
[0046] In one embodiment of this utility model, the magnetic ring assembly 32 includes a magnetic ring spacer 322 and two magnetic ring components 321. The two magnetic ring components 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 movement direction of the moving rod 31. The length of the coil assembly 21 extending along the movement direction of the moving rod 31 is defined as L, the length of the magnetic ring component 321 extending along the movement direction of the moving rod 31 is defined as l1, and the length of the magnetic ring spacer 322 extending along the movement direction of the moving rod 31 is defined as l2, where l1+l2≥L. This configuration ensures that each magnetic ring 321 reciprocates within the range of its corresponding coil group 21, ensuring effective electromagnetic interaction between each magnetic ring 321 and its corresponding coil group 21. It 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.
[0047] In one embodiment of this utility model, the linear motor 1000 further includes a magnetic element 6, which is disposed on the outer side wall of the cylinder 12 at the end away from the rear cover 13. When the mover rod 31 retracts, the magnetic element 6 applies a repulsive force to the magnetic ring assembly 32, which can buffer the impact of the mover assembly on the outer shell 1, thereby playing a role in shock absorption and noise reduction.
[0048] The magnetic component 6 can be a permanent magnet or an electromagnetic coil 211. In one embodiment of this invention, the magnetic component 6 is a permanent magnet. Permanent magnets have high energy product and high coercivity, enabling them to generate a strong magnetic field within a small volume, while also exhibiting good temperature stability, maintaining stable magnetism over a wide temperature range. Therefore, it is preferable that the magnetic component 6 is a permanent magnet.
[0049] 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, The linear motor (1000) comprises a housing (1) formed with a through hole (1a); a coil assembly (2) annularly arranged on the inner circumferential wall of the housing (1) and enclosing the housing (1) to form a movement cavity (1b) in communication with the through hole (1a); a mover assembly comprising a mover rod (31) and a magnetic ring group (32), the mover rod (31) being in sliding connection with the hole wall of the through hole (1a), and the magnetic ring group (32) being sleeved on the mover rod (31) and located in the movement cavity (1b); and a buffer assembly comprising a spring (41) and a felt (42), the spring (41) being in abutment with the magnetic ring group (32), and the felt (42) being arranged on the inner circumferential edge of the through hole (1a) and used for abutting against the spring (41). The housing (1) is formed with the through hole (1a) at both ends along the movement direction of the mover rod (31), the buffer assembly comprises two springs (41) and two felts (42), the two springs (41) are respectively in abutment with the magnetic ring group (32) at both ends along the movement direction of the mover rod (31), and each felt (42) is arranged on the inner circumferential edge of the through hole (1a) and used for abutting against the spring (41) located at the same end in the housing (1). The housing (1) is formed with a clamping structure (11) at both ends along the movement direction of the mover rod (31), the clamping structure (11) comprises an inner ring (111) and an outer ring (112), and the inner ring (111) is connected with the outer ring (112). Each inner ring (111) is formed with a through hole (1a), and each spring (41) is sleeved on the inner ring (111). Each inner ring (111) and the corresponding outer ring (112) enclose an installation ring groove (11a), and each felt (42) is annularly arranged in the installation ring groove (11a). The outer circumferential wall of the felt (42) is in abutment with the inner wall of the outer ring (112), and the inner circumferential wall of the felt (42) is in abutment with the outer circumferential wall of the inner ring (111).
2. The linear motor (1000) of claim 1, characterized in that, The housing (1) comprises a barrel (12) and a rear cover (13), the rear cover (13) is detachably connected with the barrel (12), the rear cover (13) is formed with a clamping structure (11), and the end of the barrel (12) away from the rear cover (13) is formed with another clamping structure (11).
3. The linear motor (1000) of claim 2, wherein The through hole (1a) comprises an abutment section (1a1) and an installation section (1a2), the abutment section (1a1) is in communication with the installation section (1a2), the mover rod (31) is in sliding connection with the inner wall of the abutment section (1a1), and the inner diameter of the installation section (1a2) is greater than that of the abutment section (1a1); The linear motor (1000) further comprises a steel sleeve (5) sleeved on the mover rod (31) and in sliding connection with the inner wall of the installation section (1a2).
4. The linear motor (1000) of claim 3, wherein 5. The linear motor (1000) of claim 4, characterized in that, 6. The linear motor (1000) of claim 3, wherein, 7. The linear motor (1000) of claim 1, wherein 8. Linear motor (1000) according to any one of claims 1 to 7, characterized in that The coil assembly (2) comprises a spacing ring (22) and two coil groups (21), the spacing ring (22) and the two coil groups (21) are annularly arranged on the inner circumferential wall of the shell (1), and the spacing ring (22), the two coil groups (21) and the shell (1) enclose the movement cavity (1b); the two coil groups (21) are respectively abutted on the front and rear ends of the spacing ring (22) along the movement direction of the mover rod (31).
9. The linear motor (1000) of claim 8, characterized in that, Each of the coil groups (21) comprises a positioning ring (212) and two coils (211), the outer circumferential wall of the positioning ring (212) is abutted on the inner circumferential wall of the shell (1), and the two coils (211) are respectively abutted on the front and rear ends of the positioning ring (212) along the movement direction of the mover rod (31).
10. The linear motor (1000) of claim 8, wherein, The magnetic ring group (32) comprises a magnetic ring spacing column (322) and two magnetic ring members (321), the two magnetic ring members (321) are sleeved on the mover rod (31) and are respectively abutted on the front and rear ends of the magnetic ring spacing column (322) along the movement direction of the mover rod (31); The length of the coil group (21) extending along the movement direction of the mover rod (31) is defined as L, the length of the magnetic ring member (321) extending along the movement direction of the mover rod (31) is defined as l1, the length of the magnetic ring spacing column (322) extending along the movement direction of the mover rod (31) is defined as l2, and l1+l2≥L.