Linear motor

Abstract

The utility model relates to the technical field of motor manufacturing, and discloses a linear motor, which comprises a shell and a magnetic induction assembly, and is characterized in that the shell is provided with a first through hole; the magnetic induction assembly comprises a first-stage coil, a first-stage rotor, a first-stage magnetic ring, a second-stage coil, a second-stage rotor and a second-stage magnetic ring, the shell and the first-stage coil define a first motion cavity, and the shell and the second-stage coil define a second motion cavity; the first-stage rotor penetrates through the first through hole, and the second-stage rotor is inserted into the first-stage magnetic ring; the first-stage magnetic ring is located in the first movement cavity, and the second-stage magnetic ring is located in the second movement cavity. According to the technical scheme of the utility model, the thrust applied to the first-stage rotor and the thrust applied to the second-stage rotor are superposed, so that the force of the first-stage rotor pushed out of the shell is larger; therefore, under the condition that the diameter of the linear motor is not changed, the output thrust is larger, so that the linear motor with large thrust can be applied to a long and narrow space, and the application range of the linear motor is expanded.

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] A linear motor is a new type of electric actuator. It adopts a cylindrical structure design and combines linear drive technology to achieve linear motion. It has the advantages of high speed, high precision and high efficiency during the motion process. Therefore, linear motors are widely used in many fields.

[0003] Currently, the thrust of linear motors on the market is relatively small. Under the same driving voltage, if you want to increase the thrust of the motor, you can only do so by increasing the diameter of the coil and the magnetic ring of the linear motor. However, this will increase the diameter of the linear motor, making it unsuitable for use in narrow spaces. Utility Model Content

[0004] The main objective of this invention is to provide a linear motor that enables high-thrust linear motors to be used in narrow spaces.

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

[0006] The outer casing, wherein the outer casing has a first through hole; and

[0007] A magnetic sensing assembly, comprising a primary coil, a primary mover, a primary magnetic ring, a secondary coil, a secondary mover, and a secondary magnetic ring, wherein the outer shell and the primary coil enclose a first motion cavity, and the outer shell and the secondary coil enclose a second motion cavity, wherein the two ends of the first motion cavity are respectively connected to the first through hole and the second motion cavity;

[0008] The primary mover passes through the first through hole, and the primary magnetic ring is sleeved on the primary mover; the secondary mover is inserted into the primary magnetic ring and is coaxially arranged with the primary mover, and the secondary magnetic ring is sleeved on the end of the secondary mover away from the primary mover; the primary magnetic ring is located in the first motion cavity, and the secondary magnetic ring is located in the second motion cavity.

[0009] Optionally, the primary mover is slidably connected to the inner peripheral wall of the first through hole.

[0010] Optionally, the outer casing is further provided with a second through hole, the two ends of which are respectively connected to the first moving cavity and the second moving cavity; the secondary moving element is slidably connected to the inner peripheral wall of the second through hole.

[0011] Optionally, the housing includes an outer cover, a first mounting cylinder, a connecting cover, and a second mounting cylinder. The outer cover is detachably connected to the first mounting cylinder, the connecting cover is detachably connected to the end of the first mounting cylinder away from the outer cover, and the second mounting cylinder is detachably connected to the connecting cover away from the first mounting cylinder.

[0012] The first through hole is opened in the outer cover, and the second through hole is opened in the connecting cover; the primary coil is located inside the first mounting cylinder, and the secondary coil is located inside the second mounting cylinder.

[0013] Optionally, the primary moving part is provided with a first stop ring, the first stop ring being located within the first moving cavity, and the outer diameter of the first stop ring being larger than the inner diameter of the first through hole; and / or

[0014] The secondary moving part is provided with a second stop ring, which is located inside the second moving cavity. The outer diameter of the second stop ring is larger than the inner diameter of the second through hole.

[0015] Optionally, the linear motor further includes a shock-absorbing component, which includes a silicone sleeve. One end of the silicone sleeve is disposed on the outer shell, and the other end is sleeved on the secondary mover. The silicone sleeve is used to apply a pulling force to the secondary mover in the opposite direction to the movement direction of the secondary mover.

[0016] Optionally, the magnetic sensing assembly further includes a mover connecting rod, which is inserted into the primary magnetic ring; the end of the mover connecting rod away from the primary magnetic ring is threadedly connected to the secondary mover; and the silicone sleeve is disposed in the connection gap between the mover connecting rod and the secondary mover.

[0017] Optionally, the silicone sleeve is provided with a vent hole, which connects the first motion chamber and the second motion chamber.

[0018] Optionally, the magnetic sensing component further includes a first magnetic element and a second magnetic element; the first magnetic element is disposed in the housing and located at the periphery of the first through hole facing away from the first motion cavity, and the second magnetic element is disposed in the outer wall of the housing away from the first through hole;

[0019] The first magnetic component applies a repulsive force to the primary magnetic ring, and the second magnetic component applies a repulsive force to the secondary magnetic ring.

[0020] Optionally, the primary coil includes a first positioning ring and two first coils, with the first positioning ring positioned between the two first coils. The outer peripheral wall of the first positioning ring abuts against the inner peripheral wall of the outer shell. The first positioning ring, the two first coils, and the outer shell enclose the first motion cavity; and / or,

[0021] The secondary coil includes a second positioning ring and two second coils. The second positioning ring is provided between the two second coils. The outer peripheral wall of the second positioning ring abuts against the inner peripheral wall of the outer shell. The second positioning ring, the two second coils and the outer shell enclose and form the second motion cavity.

[0022] In the technical solution of this utility model, the linear motor includes a housing and a magnetic induction assembly. The housing has a first through hole. The magnetic induction assembly includes a primary coil, a primary mover, a primary magnetic ring, a secondary coil, a secondary mover, and a secondary magnetic ring. The housing and the primary coil enclose a first motion cavity, and the housing and the secondary coil enclose a second motion cavity. The two ends of the first motion cavity are respectively connected to the first through hole and the second motion cavity. The primary mover passes through the first through hole, and the primary magnetic ring is sleeved on the primary mover. The secondary mover is inserted into the primary magnetic ring and is coaxially arranged with the primary mover. The secondary magnetic ring is sleeved on the end of the secondary mover away from the primary mover. The primary magnetic ring is located in the first motion cavity, and the secondary magnetic ring is located in the second motion cavity. In the technical solution of this utility model, after the two coils are energized, the primary coil applies a thrust to the primary magnetic ring to push the primary mover, and the secondary coil applies a thrust to the secondary magnetic ring to push the secondary mover. The thrusts on the primary mover and the secondary mover are superimposed, making the force of the primary mover pushing out of the shell greater. In this way, the output thrust is greater without changing the diameter of the linear motor, thereby enabling the high-thrust linear motor to be applied in narrow spaces, expanding the application range of the linear motor. Attached Figure Description

[0023] 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.

[0024] Figure 1 A schematic diagram of the structure of an embodiment of the linear motor provided by this utility model;

[0025] Figure 2 A schematic diagram of another embodiment of the linear motor provided by this utility model;

[0026] Figure 3 This is a schematic diagram of the outer casing of 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 protection scope of the present utility model.

[0032] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0033] Furthermore, the use of terms such as "first" and "second" in this utility model is 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 meaning of "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 a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0034] This utility model provides a linear motor 1000.

[0035] Please see Figure 1In the technical solution of this utility model, the linear motor 1000 includes a housing 1 and a magnetic sensing assembly. The housing 1 has a first through hole 1a. The magnetic sensing assembly includes a primary coil 21, a primary mover 22, a primary magnetic ring 23, a secondary coil 24, a secondary mover 25, and a secondary magnetic ring 26. The housing 1 and the primary coil 21 enclose a first motion cavity 21a, and the housing 1 and the secondary coil 24 enclose a second motion cavity 24a. The two ends of the first motion cavity 21a are respectively connected to the first through hole 1a and the second motion cavity 24a. The primary mover 22 passes through the first through hole 1a, and the primary magnetic ring 23 is sleeved on the primary mover 22. The secondary mover 25 is inserted into the primary magnetic ring 23 and is coaxially arranged with the primary mover 22. The secondary magnetic ring 26 is sleeved on the end of the secondary mover 25 away from the primary mover 22. The primary magnetic ring 23 is located in the first motion cavity 21a, and the secondary magnetic ring 26 is located in the second motion cavity 24a.

[0036] In the technical solution of this utility model, after the two coils are energized, the primary coil 21 applies a thrust to the primary magnetic ring 23 to push the primary mover 22, and the secondary coil 24 applies a thrust to the secondary magnetic ring 26 to push the secondary mover 25. The thrust received by the primary mover 22 and the secondary mover 25 are superimposed, making the force of the primary mover 22 pushing out of the outer shell 1 greater. In this way, the output thrust is greater without changing the diameter of the linear motor 1000, thereby enabling the high-thrust linear motor 1000 to be applied in narrow spaces, expanding the application range of the linear motor 1000.

[0037] It should be noted that the magnetic poles of the primary magnetic ring 23 and the secondary magnetic ring 26 need to be connected in a certain direction. Since the distance between the primary magnetic ring 23 and the secondary magnetic ring 26 is usually maintained at more than the length of the primary coil 21 or the secondary coil 24, even if the magnetic poles of the primary magnetic ring 23 and the secondary magnetic ring 26 are in opposite directions, the repulsive force generated between the primary magnetic ring 23 and the secondary magnetic ring 26 is very weak and can be ignored.

[0038] It is understood that the linear motor 1000 is not limited to including only a primary coil 21, a primary mover 22, a primary magnetic ring 23, a secondary coil 24, a secondary mover 25, and a secondary magnetic ring 26. It may also include more stages of coils, movers, and magnetic rings extending along the axial direction of the linear motor 1000, and this is not a limitation here. It is worth mentioning that when the linear motor 1000 uses more stages of coils and magnetic rings, the magnetic poles of each stage of the magnetic rings are also connected in a certain direction.

[0039] Please see Figure 1 In one embodiment of this utility model, the first-stage mover 22 is slidably connected to the inner peripheral wall of the first through hole 1a. By limiting the first-stage mover 22 by the wall of the first through hole 1a, it can be ensured that the first-stage mover 22 always reciprocates in the same straight line, thereby effectively preventing the first mover from deviating during movement.

[0040] Please see Figure 1 and Figure 3 In one embodiment of this utility model, the outer shell 1 is further provided with a second through hole 1b, the two ends of which are respectively connected to the first motion cavity 21a and the second motion cavity 24a; the secondary mover 25 is slidably connected to the inner peripheral wall of the second through hole 1b. By limiting the secondary mover 25 through the hole wall of the second through hole 1b, it can be ensured that the secondary mover 25 always reciprocates on the same straight line, thereby effectively preventing the secondary mover from deviating during movement; at the same time, the limiting effect of the first through hole 1a and the second through hole 1b can make the primary magnetic ring 23 and the secondary magnetic ring 26 suspend in the first motion cavity 21a and the second motion cavity 24a respectively, thereby avoiding the contact between the primary magnetic ring 23 and the secondary magnetic ring 26 and the primary coil 21 and the secondary coil 24 respectively, thus avoiding frictional resistance generated by the primary magnetic ring 23 and the secondary magnetic ring 26, thereby improving the output efficiency of the linear motor 1000.

[0041] Please see Figure 1 and Figure 3 In one embodiment of this utility model, the outer casing 1 includes an outer cover 11, a first mounting cylinder 12, a connecting cover 13, and a second mounting cylinder 14. The outer cover 11 is detachably connected to the first mounting cylinder 12, the connecting cover 13 is detachably connected to the end of the first mounting cylinder 12 away from the outer cover 11, and the second mounting cylinder 14 is detachably connected to the connecting cover 13 away from the first mounting cylinder 12. A first through hole 1a is formed in the outer cover 11, and a second through hole 1b is formed in the connecting cover 13. A primary coil 21 is located inside the first mounting cylinder 12, and a secondary coil 24 is located inside the second mounting cylinder 14. The detachable connections between the various components of the outer casing 1 facilitate the assembly and maintenance of the linear motor 1000.

[0042] In the technical solution of this utility model, the first-stage mover 22 is provided with a first stop ring 221, which is located in the first motion cavity 21a, and the outer diameter of the first stop ring 221 is larger than the inner diameter of the first through hole 1a; and / or, the second-stage mover 25 is provided with a second stop ring 251, which is located in the second motion cavity 24a, and the outer diameter of the second stop ring 251 is larger than the inner diameter of the second through hole 1b.

[0043] In one embodiment of this utility model, the first-stage mover 22 is provided with a first stop ring 221, which is located inside the first motion cavity 21a. The outer diameter of the first stop ring 221 is larger than the inner diameter of the first through hole 1a. The first stop ring 221 on the first-stage mover 22 effectively limits the movement range of the first-stage mover 22, thereby preventing the first-stage mover 22 from rushing out of the first motion cavity 21a from the first through hole 1a. At the same time, since the first-stage mover 22 is limited, the second-stage mover 25 can also be limited inside the second motion cavity 24a, improving the stability of the linear motor 1000 operation.

[0044] In two embodiments of this utility model, the secondary mover 25 is provided with a second stop ring 251, which is located inside the second motion cavity 24a. The outer diameter of the second stop ring 251 is larger than the inner diameter of the second through hole 1b. The second stop ring 251 protruding from the secondary mover 25 effectively limits the movement range of the secondary mover 25, thereby preventing the secondary mover 25 from rushing out of the second motion cavity 24a from the second through hole 1b and improving the stability of the linear motor 1000.

[0045] In one embodiment of this utility model, the first-stage mover 22 is provided with a first stop ring 221, which is located within the first motion cavity 21a. The outer diameter of the first stop ring 221 is larger than the inner diameter of the first through hole 1a. The second-stage mover 25 is provided with a second stop ring 251, which is located within the second motion cavity 24a. The outer diameter of the second stop ring 251 is larger than the inner diameter of the second through hole 1b. Through the joint limiting of the first stop ring 221 and the second stop ring 251, it can be ensured that both the first-stage mover 22 and the second-stage mover 25 can be stably limited within the first motion cavity 21a and the second motion cavity 24a, thereby further improving the operational stability of the linear motor 1000.

[0046] Please see Figure 1 In one embodiment of this utility model, the linear motor 1000 further includes a shock-absorbing component, which includes a silicone sleeve 33. One end of the silicone sleeve 33 is disposed on the outer shell 1, and the other end is sleeved on the secondary mover 25. The silicone sleeve 33 is used to apply a pulling force to the secondary mover 25 in the opposite direction to the movement direction of the secondary mover 25. The silicone sleeve moves back and forth in the first motion cavity 21a and the second motion cavity 24a following the reciprocating motion of the secondary mover 25. It uses its own elasticity to buffer the reciprocating motion of the primary mover 22 and the secondary mover 25, thereby achieving the effect of shock absorption and noise reduction.

[0047] Please see Figure 1 In one embodiment of this utility model, the magnetic sensing assembly further includes a mover connecting rod 29, which is inserted into the primary magnetic ring 23; the end of the mover connecting rod 29 away from the primary magnetic ring 23 is threadedly connected to the secondary mover 25; a silicone sleeve 33 is disposed in the connection gap between the mover connecting rod 29 and the secondary mover 25. The silicone sleeve 33 is fixed by the mover connecting rod 29 and the secondary mover 25 together, making the connection between the silicone sleeve 33 and the secondary mover 25 more stable.

[0048] In one embodiment of this utility model, a vent hole is provided on the silicone sleeve 33, which connects the first motion cavity 21a and the second motion cavity 24a. During the movement of the secondary mover 25, the silicone sleeve 33 may be driven by the secondary mover 25 to fold. When folding, the peripheral walls of the silicone sleeve 33 may come into contact with each other, which may cause friction and generate noise. The vent hole on the peripheral wall of the silicone sleeve 33 can reduce the probability of the peripheral walls of the silicone sleeve 33 coming into contact with each other when folding, thereby reducing the probability of noise generation by the silicone sleeve 33 to a certain extent. In addition, the vent hole can prevent air from being compressed inside the silicone sleeve 33, thereby reducing the resistance encountered by the secondary mover 25 when moving forward or backward, which helps to improve the working efficiency of the linear motor 1000 and reduce the additional load on the linear motor 1000 caused by air compression.

[0049] The damping assembly also includes at least two first damping elements 31. See [link / reference]. Figure 2 The vibration damping assembly also includes two first damping elements 31; one first damping element 31 is located on the side of the outer cover 11 facing the first moving cavity 21a, and the other first damping element 31 is located on the inner wall of the second mounting cylinder 14 away from the connecting cover 13. By providing a first damping element 31 at both ends of the overall reciprocating motion of the first-stage mover 22 and the second-stage mover 25, the vibration and noise generated by the linear motor 1000 during operation can be further reduced, and the smoothness of the linear motor 1000 operation can be improved.

[0050] The damping assembly also includes at least two secondary damping elements 32. See [link / reference]. Figure 2 In one embodiment of this utility model, the shock absorption assembly further includes two second shock absorbers 32; one second shock absorber 32 is disposed on the side of the connecting cover 13 facing away from the second moving cavity 24a, and the other second shock absorber 32 is disposed on the side of the connecting cover 13 facing away from the first moving cavity 21a. The placement of a second shock absorber 32 on each side of the connecting cover 13 effectively reduces the impact of the first-stage mover 22 and the second-stage mover 25 on the connecting cover 13, thereby further reducing the total vibration and noise generated by the linear motor 1000 during operation, and thus improving the smoothness of the linear motor 1000's operation.

[0051] Of course, the first damping element 31 and the second damping element 32 can be made of silicone, magnets, or other materials capable of buffering the impact of the moving part. In one embodiment of this utility model, both the first damping element 31 and the second damping element 32 are made of silicone. Silicone has good elasticity and flexibility, which can effectively absorb and reduce vibration, providing excellent shock absorption; at the same time, silicone does not affect the reciprocating motion of the moving part. Therefore, silicone is preferred as the material for the first damping element 31 and the second damping element 32.

[0052] Please see Figure 1In one embodiment of this utility model, the magnetic sensing component further includes a first magnetic element 27 and a second magnetic element 28. The first magnetic element 27 is disposed on the outer shell 1 and located on the periphery of the first through hole 1a facing away from the first moving cavity 21a. The second magnetic element 28 is disposed on the outer wall of the outer shell 1 away from the first through hole 1a. The first magnetic element 27 applies a repulsive force to the primary magnetic ring 23, and the second magnetic element 28 applies a repulsive force to the secondary magnetic ring 26. When the primary mover 22 and the secondary mover 25 are extended, the repulsive force applied by the first magnetic element 27 to the primary magnetic ring 23 can buffer the impact of the primary mover 22 on the outer shell 1, thereby playing a role in shock absorption and noise reduction. Similarly, when the primary mover 22 and the secondary mover 25 are retracted, the repulsive force applied by the second magnetic element 28 to the secondary magnetic ring 26 can buffer the impact of the secondary mover 25 on the outer shell 1, thereby playing a role in shock absorption and noise reduction.

[0053] In the technical solution of this utility model, the first-stage coil 21 includes a first positioning ring 211 and two first coils 212. The first positioning ring 211 is provided between the two first coils 212. The outer peripheral wall of the first positioning ring 211 abuts against the inner peripheral wall of the outer shell 1. The first positioning ring 211, the two first coils 212 and the outer shell 1 enclose to form a first motion cavity 21a; and / or, the second-stage coil 24 includes a second positioning ring 241 and two second coils 242. The second positioning ring 241 is provided between the two second coils 242. The outer peripheral wall of the second positioning ring 241 abuts against the inner peripheral wall of the outer shell 1. The second positioning ring 241, the two second coils 242 and the outer shell 1 enclose to form a second motion cavity 24a.

[0054] In one embodiment of this utility model, the primary coil 21 includes a first positioning ring 211 and two first coils 212. The first positioning ring 211 is provided between the two first coils 212. The outer peripheral wall of the first positioning ring 211 abuts against the inner peripheral wall of the outer shell 1. The first positioning ring 211, the two first coils 212, and the outer shell 1 enclose to form a first motion cavity 21a. By using the first positioning ring 211 to fix the two first coils 212, the linear motor 1000 can reduce the air gap of the linear motor 1000, improve the magnetic field utilization rate, reduce power loss, and thus improve the efficiency and thrust of the linear motor 1000.

[0055] In one embodiment of this utility model, the secondary coil 24 includes a second positioning ring 241 and two second coils 242. The second positioning ring 241 is provided between the two second coils 242. The outer peripheral wall of the second positioning ring 241 abuts against the inner peripheral wall of the outer shell 1. The second positioning ring 241, the two second coils 242, and the outer shell 1 enclose to form a second motion cavity 24a. By using the second positioning ring 241 to fix the two second coils 242, the linear motor 1000 can reduce the air gap of the linear motor 1000, improve the magnetic field utilization rate, reduce power loss, and thus improve the efficiency and thrust of the linear motor 1000.

[0056] In one embodiment of this utility model, the primary coil 21 includes a first positioning ring 211 and two first coils 212. The first positioning ring 211 is disposed between the two first coils 212, and the outer peripheral wall of the first positioning ring 211 abuts against the inner peripheral wall of the outer shell 1. The first positioning ring 211, the two first coils 212, and the outer shell 1 enclose to form a first motion cavity 21a. The secondary coil 24 includes a second positioning ring 241 and two second coils 242. The second positioning ring 241 is disposed between the two second coils 242, and the outer peripheral wall of the second positioning ring 241 abuts against the inner peripheral wall of the outer shell 1. The second positioning ring 241, the two second coils 242, and the outer shell 1 enclose to form a second motion cavity 24a. This can further improve the efficiency and thrust of the linear motor 1000.

[0057] It should be noted that the linear motor 1000 provided by this utility model can be applied to massage products such as massage sticks, massage chairs, fascia guns, and massage beds that require high thrust.

[0058] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using 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 in that, include: The outer casing (1) has a first through hole (1a); and A magnetic sensing assembly, comprising a primary coil (21), a primary mover (22), a primary magnetic ring (23), a secondary coil (24), a secondary mover (25), and a secondary magnetic ring (26), wherein the outer shell (1) and the primary coil (21) enclose to form a first motion cavity (21a), and the outer shell (1) and the secondary coil (24) enclose to form a second motion cavity (24a), wherein the two ends of the first motion cavity (21a) are respectively connected to the first through hole (1a) and the second motion cavity (24a); The primary mover (22) passes through the first through hole (1a), and the primary magnetic ring (23) is sleeved on the primary mover (22); the secondary mover (25) is inserted into the primary magnetic ring (23) and is coaxially arranged with the primary mover (22); the secondary magnetic ring (26) is sleeved on the end of the secondary mover (25) away from the primary mover (22); the primary magnetic ring (23) is located in the first motion cavity (21a), and the secondary magnetic ring (26) is located in the second motion cavity (24a).

2. The linear motor (1000) as described in claim 1, characterized in that, The first-stage mover (22) is slidably connected to the inner peripheral wall of the first through hole (1a).

3. The linear motor (1000) as described in claim 2, characterized in that, The outer shell (1) is also provided with a second through hole (1b), the two ends of which are connected to the first motion cavity (21a) and the second motion cavity (24a) respectively; the secondary mover (25) is slidably connected to the inner peripheral wall of the second through hole (1b).

4. The linear motor (1000) as described in claim 3, characterized in that, The outer casing (1) includes an outer cover (11), a first mounting cylinder (12), a connecting cover (13), and a second mounting cylinder (14). The outer cover (11) is detachably connected to the first mounting cylinder (12), the connecting cover (13) is detachably connected to the end of the first mounting cylinder (12) away from the outer cover (11), and the second mounting cylinder (14) is detachably connected to the connecting cover (13) away from the first mounting cylinder (12). The first through hole (1a) is opened in the outer cover (11), and the second through hole (1b) is opened in the connecting cover (13); the primary coil (21) is located inside the first mounting cylinder (12), and the secondary coil (24) is located inside the second mounting cylinder (14).

5. The linear motor (1000) as described in claim 3, characterized in that, The primary mover (22) is provided with a first stop ring (221), which is located within the first moving cavity (21a). The outer diameter of the first stop ring (221) is larger than the inner diameter of the first through hole (1a); and / or, The secondary mover (25) is provided with a second stop ring (251), which is located in the second motion cavity (24a). The outer diameter of the second stop ring (251) is larger than the inner diameter of the second through hole (1b).

6. The linear motor (1000) as described in claim 1, characterized in that, The linear motor (1000) also includes a shock-absorbing component, which includes a silicone sleeve (33). One end of the silicone sleeve (33) is disposed on the outer shell (1), and the other end is sleeved on the secondary mover (25). The silicone sleeve (33) is used to apply a pulling force to the secondary mover (25) in the opposite direction to the movement direction of the secondary mover (25).

7. The linear motor as described in claim 6, characterized in that, The magnetic sensing assembly also includes a mover connecting rod (29), which is inserted into the primary magnetic ring (23); the end of the mover connecting rod (29) away from the primary magnetic ring (23) is threadedly connected to the secondary mover (25); the silicone sleeve (33) is disposed in the connection gap between the mover connecting rod (29) and the secondary mover (25).

8. The linear motor as described in claim 6, characterized in that, The silicone sleeve (33) has a vent hole, which connects the first motion chamber (21a) and the second motion chamber (24a).

9. The linear motor (1000) as described in any one of claims 1 to 8, characterized in that, The magnetic component further includes a first magnetic element (27) and a second magnetic element (28); the first magnetic element (27) is disposed on the outer shell (1) and located on the periphery of the first through hole (1a) facing away from the first motion cavity (21a); ​​the second magnetic element (28) is disposed on the outer wall of the outer shell (1) away from the first through hole (1a). The first magnetic element (27) applies a repulsive force to the primary magnetic ring (23), and the second magnetic element (28) applies a repulsive force to the secondary magnetic ring (26).

10. The linear motor (1000) as described in any one of claims 1 to 8, characterized in that, The primary coil (21) includes a first positioning ring (211) and two first coils (212). The first positioning ring (211) is disposed between the two first coils (212). The outer peripheral wall of the first positioning ring (211) abuts against the inner peripheral wall of the outer shell (1). The first positioning ring (211), the two first coils (212), and the outer shell (1) enclose to form the first motion cavity (21a); ​​and / or, The secondary coil (24) includes a second positioning ring (241) and two second coils (242). The second positioning ring (241) is provided between the two second coils (242). The outer peripheral wall of the second positioning ring (241) abuts against the inner peripheral wall of the outer shell (1). The second positioning ring (241), the two second coils (242) and the outer shell (1) enclose to form the second motion cavity (24a).

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