Linear motor

Abstract

The utility model relates to the technical field of motor manufacturing, and discloses a linear motor, which comprises a shell and an output assembly, and is characterized in that the shell is provided with a mounting hole; the output assembly comprises a coil, a magnetic ring, a mover push rod and a magnetic part, the mover push rod is slidably connected with the inner circumferential wall of the mounting hole, and the magnetic ring sleeves the mover push rod; the coil is arranged in the shell, and a motion space for accommodating the rotor push rod and the magnetic ring is formed; the magnetic part is arranged on the outer wall of the shell and can apply magnetic force towards the mounting hole to the magnetic ring. In the technical scheme, the rotor push rod is fixed on the magnetic ring, and the coil generates magnetic force to push the magnetic ring to move after being electrified, so that the rotor push rod is driven to move; when the mover push rod moves in the direction of being pushed away from the motion space, the direction of the force applied to the magnetic ring by the coil is the same as that of the force applied to the magnetic ring by the magnetic piece, and the two forces are superposed to enable the thrust borne by the magnetic ring to be larger, namely the thrust of the mover push rod pushed is larger, so that the thrust output by the linear motor is larger.

Description

Technical Field

[0001] The utility model relates to the technical field of motor manufacturing, and particularly relates to a linear motor. Background Art

[0002] The cylindrical linear motor is a new type of electric actuator with wide application fields and advantages. It adopts a cylindrical structure design, combines linear drive technology to achieve linear motion, and has the characteristics of high speed, high precision and high efficiency during the motion process.

[0003] However, the air gap between the primary coil and the secondary magnet in the cylindrical linear motor is usually more than 1 mm. The large air gap results in low efficiency and weak thrust of this linear motor. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a linear motor, aiming to increase the thrust of the linear motor.

[0005] To achieve the above purpose, the linear motor proposed by the utility model includes:

[0006] A housing, which is provided with an installation hole; and

[0007] An output assembly, which includes a coil, a magnetic ring, a moving push rod and a magnetic member. The moving push rod is slidably connected to the inner peripheral wall of the installation hole, and the magnetic ring is sleeved on the moving push rod; the coil is arranged inside the housing and forms a movement space for accommodating the moving push rod and the magnetic ring;

[0008] The magnetic member is arranged on the outer wall of the housing and can apply a magnetic force towards the installation hole to the magnetic ring.

[0009] Optionally, the housing includes a barrel body and a lower cover, the barrel body is detachably connected to the lower cover, the lower cover is provided with the installation hole, and the coil is arranged inside the barrel body; the magnetic member is arranged on the side of the lower cover facing away from the magnetic ring; the installation hole includes a movable section and an installation section, the installation section is located at one end of the movable section away from the movement space, and the inner diameter of the movable section is smaller than that of the installation section; the moving push rod is slidably connected to the inner peripheral wall of the movable section; the magnetic member is arranged on the inner wall of the installation section, and the moving push rod passes through the magnetic member.

[0010] Optionally, the moving push rod is slidably connected to the inner wall of the magnetic member.

[0011] Optionally, the moving push rod is formed with a stop portion, the stop portion abuts against the periphery of the magnetic ring, and the outer diameter of the stop portion is larger than the inner diameter of the installation hole.

[0012] Optionally, the coil includes a first coil segment, a second coil segment, and a positioning ring. The first coil segment is connected to the positioning ring, the second coil segment is connected to one end of the positioning ring facing away from the first coil segment, and the outer periphery of the positioning ring abuts against the barrel body.

[0013] Optionally, the output assembly further includes at least two shock absorbers. One shock absorber is disposed on the bottom wall of the movement space at the end away from the mounting hole, and the other shock absorber is disposed on the periphery of the mounting hole at the end facing the movement space.

[0014] Optionally, the housing further includes a filling member. A filling gap is formed between the barrel body and the coil, and the filling member is filled in the filling gap.

[0015] Optionally, the filling member is made of heat-dissipating silica gel.

[0016] Optionally, a bottom hole is formed at one end of the barrel body away from the mounting hole, and the inner diameter of the bottom hole is smaller than the outer diameter of the magnetic ring.

[0017] Optionally, the housing includes a barrel body and a lower cover. The barrel body is detachably connected to the lower cover. The lower cover is provided with the mounting hole, and the coil is disposed inside the barrel body; the magnetic member is disposed on the side of the magnetic ring facing away from the lower cover.

[0018] In the technical solution of the present utility model, the linear motor includes a housing and an output assembly. The housing is provided with a mounting hole; the output assembly includes a coil, a magnetic ring, a moving push rod, and a magnetic member. The moving push rod is slidably connected to the inner peripheral wall of the mounting hole, and the magnetic ring is sleeved on the moving push rod; the coil is disposed inside the housing and forms a movement space for accommodating the moving push rod and the magnetic ring with the lower cover; the magnetic member is disposed on the outer wall of the housing and can apply a magnetic force towards the mounting hole to the magnetic ring. In the technical solution of the present utility model, the moving push rod is fixed to the magnetic ring. After the coil is energized, a magnetic field is formed to generate a magnetic force to push the magnetic ring to move, thereby driving the moving push rod to move; when the moving push rod moves in the direction of being pushed out of the movement space, the direction of the force applied by the coil to the magnetic ring is the same as the direction of the force applied by the magnetic member to the magnetic ring, and the two forces are superimposed so that the thrust received by the magnetic ring is greater, that is, the thrust for pushing the moving push rod is greater, so that the thrust output by the linear motor is greater. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0020] Figure 1 A structural schematic diagram of an embodiment of the linear motor provided by the present utility model;

[0021] Figure 2 A structural schematic diagram of another embodiment of the linear motor provided by the present utility model;

[0022] Figure 3 A structural schematic diagram of the lower cover of the linear motor.

[0023] Explanation of the reference numerals in the drawings:

[0024] Reference numeral Name Reference numeral Name 1000 Linear motor 211 Moving space 1 Outer shell 212 First coil segment 11 Barrel body 213 Second coil segment 111 Bottom hole 214 Positioning ring 12 Lower cover 22 Magnetic ring 121 Mounting hole 23 Rotor push rod 1211 Moving segment 231 Stopping portion 1212 Mounting segment 24 Magnetic part 13 Filling part 25 Shock absorber 21 Coil

[0025] The realization of the purpose, functional characteristics and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0028] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0029] Please refer to Figure 1 , to solve the problem of weak thrust of the linear motor, the present utility model proposes a linear motor 1000, including:

[0030] A housing 1 and an output component, the housing 1 is provided with an installation hole 121; the output component includes a coil 21, a magnetic ring 22, a mover push rod 23 and a magnetic member 24, the mover push rod 23 is slidably connected to the inner peripheral wall of the installation hole 121, and the magnetic ring 22 is sleeved on the mover push rod 23; the coil 21 is arranged inside the housing 1 and forms a movement space 211 for accommodating the mover push rod 23 and the magnetic ring 22; the magnetic member 24 is arranged on the outer wall of the housing 1 and can apply a magnetic force towards the installation hole 121 to the magnetic ring 22.

[0031] In the technical solution of the present utility model, the mover push rod 23 is fixed to the magnetic ring 2. After the coil 21 is energized, a magnetic field is formed to generate a magnetic force to push the magnetic ring 22 to move, thereby driving the mover push rod 23 to move; when the mover push rod 23 moves in the direction of being pushed away from the movement space 211, the direction of the force applied by the coil 21 to the magnetic ring 22 is the same as the direction of the force applied by the magnetic member 24 to the magnetic ring 22, and the superposition of the two forces makes the thrust received by the magnetic ring 22 greater, that is, the thrust for pushing the mover push rod 23 is greater, so that the thrust output by the linear motor 1000 is greater.

[0032] Specifically, the magnetic member 24 can be arranged at one end of the housing 1 close to the installation hole 121, and the magnetic pole of the end of the magnetic member 24 close to the magnetic ring 22 is opposite to the magnetic pole of the end of the magnetic ring 22 close to the magnetic member 24; or, the magnetic member 24 can also be arranged at one end of the housing 1 far from the installation hole 121, and the magnetic pole of the end of the magnetic member 24 close to the magnetic ring 22 is the same as the magnetic pole of the end of the magnetic ring 22 close to the magnetic member 24.

[0033] Please refer to Figure 3 , in an embodiment of the present utility model, the housing 1 includes a barrel body 11 and a lower cover 12, the barrel body 11 is detachably connected to the lower cover 12, the lower cover 12 is provided with an installation hole 121, and the coil 21 is arranged inside the barrel body 11; the magnetic member 24 is arranged on the side of the lower cover 12 facing away from the magnetic ring 22; the installation hole 121 includes a movable section 1211 and an installation section 1212, the installation section 1212 is located at one end of the movable section 1211 far from the movement space 211, and the inner diameter of the movable section 1211 is smaller than the inner diameter of the installation section 1212; the mover push rod 23 is slidably connected to the inner peripheral wall of the movable section 1211; the magnetic member 24 is arranged on the inner wall of the installation section 1212, and the mover push rod 23 passes through the magnetic member 24. The barrel body 11 and the lower cover 12 are detachably connected, which is convenient for installing the output component inside the housing 1; by using the magnetic force of mutual attraction between the magnetic member 24 and the magnetic ring 22, the magnetic member 24 can be stably installed on the installation section 1212, so that the magnetic member 24 can be prevented from falling off.

[0034] In an embodiment of the present utility model, the mover push rod 23 is slidably connected to the inner wall of the magnetic member 24. Such a setting enables the inner wall of the magnetic member 24 and the inner peripheral wall of the movable section 1211 to jointly limit the mover push rod 23, thereby ensuring that the mover push rod 23 and the magnetic ring 22 are suspended in the movement space 211 to eliminate the frictional resistance caused by the outer peripheral wall of the magnetic ring 22 abutting against the inner peripheral wall of the coil 21, and further improving the maximum thrust that the linear motor 1000 can output.

[0035] In an embodiment of the present utility model, the mover push rod 23 is formed with a stop portion 231, the stop portion 231 abuts against the periphery of the magnetic ring 22, and the outer diameter of the stop portion 231 is greater than the inner diameter of the mounting hole 121. Since the outer diameter of the stop portion 231 is greater than the inner diameter of the mounting hole 121, the stop portion 231 cannot move out of the movement space 211 through the mounting hole 121. In this way, the magnetic ring 22 and the part of the mover push rod 23 connected to the magnetic ring 22 can be limited within the movement space 211, preventing the mover push rod 23 and the magnetic ring 22 from being pushed out of the housing 1 when the motor current is too large.

[0036] In an embodiment of the present utility model, the coil 21 includes a first coil section 212, a second coil section 213, and a positioning ring 214. The first coil section 212 is connected to the positioning ring 214, and the second coil section 213 is connected to the end of the positioning ring 214 facing away from the first coil section 212. The outer periphery of the positioning ring 214 abuts against the barrel body 11. The linear motor 1000 directly fixes the first coil section 212 and the second coil section 213 by using the positioning ring 214, so as to reduce the air gap of the linear motor 1000, improve the magnetic field utilization rate, reduce power loss, etc., and further improve the motor efficiency and thrust.

[0037] When the magnetic ring 22 and the mover push rod 23 perform reciprocating motion, they will inevitably hit both ends of the movement space 211, that is, the lower cover 12 and the end of the barrel body 11 far from the lower cover 12. To solve this problem, the output assembly further includes at least two shock absorbers 25. In an embodiment of the present utility model, the output assembly further includes two shock absorbers 25. One shock absorber 25 is provided on the bottom wall of the movement space 211 far from the mounting hole 121, and the other shock absorber 25 is provided on the periphery of the mounting hole 121 facing the movement space 211. Installing shock absorbers 25 at both ends of the movement space 211 can weaken the impact of the magnetic ring 22 and the mover push rod 23 hitting both ends of the movement space 211 on the vibration of the linear motor 1000.

[0038] In an embodiment of the present utility model, the housing 1 further includes a filling member 13. A filling gap is formed between the barrel body 11 and the coil 21, and the filling member 13 is filled in the filling gap. Using the filling member 13 to fill between the barrel body 11 and the coil 21 can effectively reinforce the coil 21 and maintain the structural stability of the coil 21.

[0039] It can be understood that the material of the filling member 13 can be rubber or heat-dissipating silica gel. In an embodiment of the present invention, the material of the filling member 13 is heat-dissipating silica gel. Since heat is generated when the linear motor 1000 operates after the coil 21 is energized, the heat-dissipating silica gel can effectively conduct the heat generated by the coil 21 to the barrel body 11, and the heat is dissipated to the outside through the barrel body 11, thereby improving the heat dissipation efficiency of the linear motor 1000.

[0040] In an embodiment of the present invention, a bottom hole 111 is formed at one end of the barrel body 11 away from the mounting hole 121, and the inner diameter of the bottom hole 111 is smaller than the outer diameter of the magnetic ring 22. The coil 21 in the barrel body 11 can be wired to external components through the bottom hole 111, thereby avoiding the interference of external wires to the movement of the moving push rod 23 and the magnetic ring 22.

[0041] It can be understood that the magnetic member 24 can be an energized coil 21, a magnetic ring 22 or a magnet block. In an embodiment of the present invention, the magnetic member 24 is a weak magnetic ring 22. The magnetic force of the weak magnetic ring 22 is small, and the attractive or repulsive force between it and the magnetic ring 22 is small, so as to avoid the force exerted by the magnetic member 24 on the magnetic ring 22 being too large to pull back the moving push rod 23 and the magnetic ring 22 when they are pulled back. In this way, the reciprocating movement of the moving push rod 23 and the magnetic ring 22 can be realized. Therefore, it is preferred that the magnetic member 24 is a weak magnetic ring 22.

[0042] Please refer to Figure 2 , in an embodiment of the present invention, the housing 1 includes a barrel body 11 and a lower cover 12. The barrel body 11 and the lower cover 12 are detachably connected. The lower cover 12 is provided with a mounting hole 121, and the coil 21 is arranged in the barrel body 11; the magnetic member 24 is arranged on the side of the magnetic ring 22 facing away from the lower cover 12.

[0043] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A linear motor (1000), characterized in that, Comprising: A housing (1), the housing (1) being provided with a mounting hole (121); And An output assembly, the output assembly comprising a coil (21), a magnetic ring (22), a mover push rod (23) and a magnetic member (24), the mover push rod (23) being slidably connected to the inner peripheral wall of the mounting hole (121), the magnetic ring (22) being sleeved on the mover push rod (23); the coil (21) is disposed within the housing (1) and forms a movement space (211) for accommodating the mover push rod (23) and the magnetic ring (22); The magnetic member (24) is disposed on the outer wall of the housing (1) and is capable of applying a magnetic force towards the mounting hole (121) to the magnetic ring (22).

2. The linear motor (1000) according to claim 1, characterized in that, The housing (1) includes a barrel body (11) and a lower cover (12), the barrel body (11) being detachably connected to the lower cover (12), the lower cover (12) being provided with the mounting hole (121), the coil (21) being disposed within the barrel body (11); the magnetic member (24) is disposed on a side of the lower cover (12) facing away from the magnetic ring (22); the mounting hole (121) includes a movable section (1211) and a mounting section (1212), the mounting section (1212) being located at an end of the movable section (1211) away from the movement space (211), the inner diameter of the movable section (1211) being smaller than the inner diameter of the mounting section (1212); the mover push rod (23) is slidably connected to the inner peripheral wall of the movable section (1211); the magnetic member (24) is disposed on the inner wall of the mounting section (1212), and the mover push rod (23) passes through the magnetic member (24).

3. The linear motor (1000) according to claim 2, wherein The mover push rod (23) is slidably connected to the inner wall of the magnetic member (24).

4. The linear motor (1000) according to claim 2, wherein, The mover push rod (23) is formed with a stop portion (231), the stop portion (231) being in abutment with the periphery of the magnetic ring (22), and the outer diameter of the stop portion (231) being larger than the inner diameter of the mounting hole (121).

5. The linear motor (1000) according to claim 2, characterized in that, The coil (21) includes a first coil section (212), a second coil section (213) and a positioning ring (214), the first coil section (212) being connected to the positioning ring (214), the second coil section (213) being connected to an end of the positioning ring (214) facing away from the first coil section (212), and the outer periphery of the positioning ring (214) being in abutment with the barrel body (11).

6. The linear motor (1000) according to any one of claims 2 to 5, characterized in that, The output assembly further includes at least two shock absorbers (25), one shock absorber (25) being disposed on the bottom wall at an end of the movement space (211) away from the mounting hole (121), and the other shock absorber (25) being disposed on the periphery at an end of the mounting hole (121) facing the movement space (211).

7. The linear motor (1000) according to any one of claims 2 to 5, characterized in that The housing (1) further includes a filling member (13), a filling gap is formed between the barrel body (11) and the coil (21), and the filling member (13) is filled in the filling gap.

8. The linear motor (1000) according to claim 7, characterized in that, The material of the filling member (13) is heat-dissipating silica gel.

9. The linear motor (1000) according to any one of claims 2 to 5, characterized in that, One end of the cylinder body (11) away from the mounting hole (121) is formed with a bottom hole (111), and the inner diameter of the bottom hole (111) is smaller than the outer diameter of the magnetic ring (22).

10. The linear motor according to claim 1, characterized in that, The housing (1) includes a cylinder body (11) and a lower cover (12). The cylinder body (11) is detachably connected to the lower cover (12). The lower cover (12) is provided with the mounting hole (121), and the coil (21) is arranged inside the cylinder body (11); the magnetic member (24) is arranged on a side of the magnetic ring (22) facing away from the lower cover (12).

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