Linear motor

Abstract

The utility model discloses a linear motor, which comprises a cylinder body, a coil, a positioning ring and a rotor assembly, and is characterized in that the cylinder body is provided with a mounting cavity and a mounting port communicated with the mounting cavity; the coil is located in the mounting cavity, and the outer peripheral wall of the coil abuts against the inner peripheral wall of the mounting cavity; the positioning ring is detachably connected with the cylinder body and is positioned in the mounting cavity; the outer side wall of the coil abuts against the outer side wall of the positioning ring. The coil and the positioning ring are enclosed to form a driving channel; the rotor assembly is arranged in the mounting opening in a penetrating mode and is in clearance fit with the inner wall of the driving channel. According to the technical scheme provided by the utility model, the problems of large air gap, low magnetic field utilization rate, large power loss and the like of the traditional cylindrical linear motor design can be solved.

Description

Technical Field

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

[0002] A linear motor is an electrical device that directly converts electrical energy into linear motion. It realizes the precise movement of the mover along a linear trajectory through the interaction of electromagnetic fields. As a high-performance linear motion driving device, the linear motor has a wide range of application fields, covering many aspects from industrial automation to precision instruments. The linear motor is also widely used in numerical control machine tools, robots, aerospace simulators, and military equipment to provide linear motion solutions with high speed, high precision, and high reliability. With the progress of technology and the reduction of costs, the application scope of the linear motor is still expanding, promoting the development of all walks of life towards higher efficiency and higher precision.

[0003] The air gap between the primary coil and the secondary magnet of the traditional cylindrical linear motor is usually more than 1 mm, and there are objects such as plastics blocking between the primary coil and the secondary magnet, weakening the magnetic field. This results in low magnetic field utilization rate, large power loss of the linear motor, and weak thrust. The traditional cylindrical linear motor design has problems such as a large air gap, low magnetic field utilization rate, and large power loss, resulting in limited efficiency and thrust performance. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a linear motor, aiming to solve the problems existing in the design of the traditional cylindrical linear motor, such as a relatively large air gap, usually more than 1 mm, and there are objects such as plastics blocking between the primary coil and the secondary magnet, weakening the magnetic field, resulting in low magnetic field utilization rate and large power loss. The linear motor proposed by the utility model can reduce the air gap to 0.2 - 0.3 mm, and there are no objects such as plastics blocking between the primary coil and the secondary magnet, increasing the magnetic field utilization rate and improving the efficiency and thrust of the motor.

[0005] To achieve the above object, a linear motor proposed by the utility model includes: a cylinder body, a coil, a positioning ring, and a mover assembly. The cylinder body is provided with an installation cavity and an installation port communicating with the installation cavity; the coil is located in the installation cavity, and the outer peripheral wall of the coil abuts against the inner peripheral wall of the installation cavity; the positioning ring is detachably connected to the cylinder body and is located in the installation cavity; the outer side wall of the coil abuts against the outer side wall of the positioning ring; a driving channel is formed by enclosing the coil and the positioning ring; the mover assembly passes through the installation port, and the mover assembly is in clearance fit with the inner wall of the driving channel.

[0006] In one embodiment, the linear motor includes at least one positioning ring and at least two coils disposed in the installation cavity; each positioning ring is located between two adjacent coils and abuts against the outer sidewalls of the two adjacent coils; on opposite sides of each positioning ring facing two adjacent coils, there are formed bosses, and at one end of each coil abutting against the positioning ring, there is provided a groove engaging with the corresponding boss.

[0007] In one embodiment, the mover assembly includes a magnetic ring and a push rod, the magnetic ring is detachably connected to the push rod, the push rod passes through the installation opening, the magnetic ring is in clearance fit with the positioning ring, and the magnetic ring is slidably connected to the inner wall of the driving channel.

[0008] In one embodiment, the positioning ring is made of an insulating material.

[0009] In one embodiment, the positioning ring is provided with wire grooves located at the outer edge of the positioning ring.

[0010] In one embodiment, the cylinder body is provided with at least one wire outlet hole, and each wire outlet hole is located at the bottom wall of the installation cavity.

[0011] In one embodiment, the cylinder body further includes a cover body, the cover body is detachably connected to the cylinder body, and the cover body is located at the installation opening.

[0012] In one embodiment, on one side of the cover body facing the installation cavity, there is provided a first shock-absorbing ring, and the first shock-absorbing ring is detachably connected to the cover body.

[0013] In one embodiment, the bottom wall of the installation cavity is provided with a second shock-absorbing ring, and the second shock-absorbing ring is detachably connected to the bottom wall of the installation cavity.

[0014] In one embodiment, there is heat dissipation silica gel between the coil and the cylinder body.

[0015] The technical solution of the present utility model designs a linear motor, which includes key components such as a cylinder body, a coil, a positioning ring, and a mover assembly. An installation cavity is provided inside the cylinder body, and the coil is placed in the installation cavity and abuts against the bottom wall to ensure the stability of the coil position. The positioning ring is also located in the installation cavity and abuts against the coil. The positioning ring is provided with through holes through which the coil leads on both sides of the positioning ring can pass. At the same time, the positioning ring and the cylinder body are detachably connected, which is convenient for assembly and maintenance. The coil and the positioning ring jointly enclose a driving channel, and the mover assembly passes through the installation port and slides on the inner wall of the driving channel, so that it can move smoothly in a straight line direction when the motor is working. This linear motor directly fixes the coil through the practical positioning ring. At the same time, the positioning ring and the coil jointly enclose a driving channel, and the mover assembly has a clearance fit with the inner wall of the driving channel, reducing the air gap of the linear motor, improving the magnetic field utilization rate, reducing power loss and other problems, thereby improving the motor efficiency and thrust. Brief Description of the Drawings

[0016] 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 use in 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.

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the linear motor provided by the present utility model;

[0018] Figure 2 It is a schematic structural diagram of another embodiment of the linear motor provided by the present utility model;

[0019] Figure 3 It is a schematic structural diagram of an embodiment of the positioning ring provided by the present utility model.

[0020] Explanation of the reference numerals in the drawings:

[0021] 100, linear motor; 1, cylinder body; 1a, installation cavity; 1b, installation port; 11, cover body; 12, first shock-absorbing ring; 13, second shock-absorbing ring; 1c, wire outlet hole; 2, coil; 2a, driving channel; 2b, groove; 3, positioning ring; 31, boss; 3a, through hole; 3b, wire groove; 4, mover assembly; 41, magnetic ring; 42, push rod.

[0022] The realization of the purpose, functional features, and advantages of the present utility model will be further described with reference to the embodiments and the drawings. Detailed Embodiments

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with 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 embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0024] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0025] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. 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 such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. 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.

[0026] The present utility model provides a linear motor 100.

[0027] Please refer to Figures 1 to 3 , in an embodiment of the present utility model, the linear motor 100 includes: a cylinder body 1, a coil 2, a positioning ring 3, and a mover assembly 4. The cylinder body 1 is provided with an installation cavity 1a and an installation opening 1b communicating with the installation cavity 1a; the coil 2 is located in the installation cavity 1a, and the outer peripheral wall of the coil 2 abuts against the inner peripheral wall of the installation cavity 1a; the positioning ring 3 is detachably connected to the cylinder body 1 and is located in the installation cavity 1a; the outer side wall of the coil 2 abuts against the outer side wall of the positioning ring 3; a driving channel 2a is formed by enclosing the coil 2 and the positioning ring 3; the mover assembly 4 passes through the installation opening 1b, and the mover assembly 4 is in clearance fit with the inner wall of the driving channel 2a.

[0028] In this embodiment, the cylinder 1 of the linear motor 100 is the basic component of the entire motor structure. The cylinder 1 is generally of a cylindrical structure and can be integrally formed by machining or casting, or can be connected by two or more arc-shaped materials through bolts or buckles. The cylinder 1 is usually made of a strong and lightweight material, such as cast iron or aluminum alloy, to ensure overall rigidity and stability. An installation cavity 1a is designed inside the cylinder 1 to accommodate the internal parts of the linear motor 100 and is connected to the outside through an installation port 1b to facilitate the threading of the mover assembly 4 and the assembly of the motor.

[0029] In one embodiment, the coils 2 are responsible for generating the magnetic field of the linear motor 100. These coils 2 are usually made of highly conductive materials such as copper or aluminum, are specifically wound according to the size of the drive end of the linear motor 100, and a drive channel 2a is formed inside the coils 2 to optimize the magnetic field distribution and improve the motor efficiency. The coils 2 are made of thermally bonded enameled wire. After the coils 2 are wound, they are shaped by heating. The coils 2 are fixed in the installation cavity 1a of the cylinder 1 in the linear motor 100 and interact with the mover assembly 4 to generate linear motion through the principle of electromagnetic induction. The design of the coils 2 also needs to consider the heat dissipation requirements to ensure stability and lifespan during long-term operation. The design of the coils 2 of the linear motor 100 is the key to achieving efficient and precise motion control and is widely used in many fields such as automation equipment, precision positioning systems, and high-speed transportation systems.

[0030] In one embodiment, the positioning ring 3 plays a key role in the linear motor 100. It is a mechanical structure for fixing and positioning the coils 2. By fixing the coils 2 through the positioning ring 3, the formation of the drive channel 2a inside the coils 2 is achieved, and thus the air gap between the coils 2 and the mover assembly 4 is guaranteed to reach an extremely small standard. Generally, this air gap can be reduced to less than 0.3 mm. The positioning ring 3 is usually made of wear-resistant insulating materials, and generally, polyoxymethylene (POM) or polycarbonate (PC) materials can be used. The positioning ring 3 not only provides stable support for the coils 2 but also ensures that the coils 2 maintain the correct position and alignment throughout the working length of the motor. The design of the positioning ring 3 also needs to consider matching the thermal expansion coefficient of the coils 2 to maintain the accuracy and reliability during long-term operation.

[0031] In one embodiment, the mover assembly 4 of the linear motor 100 is a key part for achieving linear motion. It is usually composed of a push rod 42 and an electromagnetic coil 2 or a permanent magnet mounted thereon. The mover assembly 4 moves along the guiding system of the stator (i.e., the fixed part of the motor) and interacts with the coil 2 in the stator to generate electromagnetic force, thereby achieving linear motion. The design of the mover assembly 4 needs to ensure that the air gap between it and the coil 2 is as uniform as possible to maintain high electromagnetic conversion efficiency and motion accuracy. The mover assembly 4 is usually integrated with sensors and a feedback system for real-time monitoring and adjustment of its position to ensure high-precision positioning and repeatability.

[0032] The technical solution of the present utility model designs a linear motor 100, including key components such as a cylinder body 1, a coil 2, a positioning ring 3, and a mover assembly 4. An installation cavity 1a is provided in the cylinder body 1, and the coil 2 is placed in the installation cavity 1a and abuts against the bottom wall to ensure the stability of the position of the coil 2. The positioning ring 3 is also located in the installation cavity 1a and abuts against the coil 2. The positioning ring 3 is provided with a through hole 3a through which the lead wires of the coil 2 on both sides of the positioning ring 3 can pass. At the same time, the positioning ring 3 and the cylinder body 1 adopt a detachable connection method, which is convenient for assembly and maintenance. The coil 2 and the positioning ring 3 jointly enclose a driving channel 2a. The mover assembly 4 passes through the installation port 1b and slides on the inner wall of the driving channel 2a, so that it can move smoothly in a straight line direction when the motor is working. This linear motor 100 directly fixes the coil 2 by using the positioning ring 3. At the same time, the positioning ring 3 and the coil 2 jointly enclose a driving channel 2a, and the mover assembly 4 has a clearance fit with the inner wall of the driving channel 2a, reducing the air gap of the linear motor 100, improving problems such as magnetic field utilization rate and reducing power loss, and further improving the motor efficiency and thrust.

[0033] In one embodiment of the present utility model, please refer to Figure 1 and Figure 2 , the linear motor 100 includes at least one positioning ring 3 and at least two coils 2 provided in the installation cavity 1a; each positioning ring 3 is located between two adjacent coils 2 and abuts against the outer side walls of the two adjacent coils 2; each positioning ring 3 is formed with a boss 31 on the opposite sides facing the two adjacent coils 2, and each coil 2 is provided with a groove 2b at one end abutting against the positioning ring 3 for snap-fitting with the corresponding boss 31.

[0034] In this embodiment, the linear motor 100 includes at least one positioning ring 3 and at least two coils 2. Each positioning ring 3 is connected between two of the coils 2 to ensure the fixation and alignment of the coils 2. On both sides of each positioning ring 3 near the coils 2, there are provided bosses 31, and these bosses 31 play a role in supporting and positioning the coils 2. Correspondingly, on one side of each coil 2 near the positioning ring 3, there are provided grooves 2b, and these grooves 2b are precisely matched with the bosses 31 on the positioning ring 3 to form a mechanical interlock to maintain the stable position of the coil 2 in the motor. Through this design, the coil 2 and the positioning ring 3 together constitute the electromagnetic part of the motor, where the coil 2 is responsible for generating a magnetic field, while the positioning ring 3 plays a role in structural support and precise positioning. This structure not only improves the assembly accuracy of the motor but also enhances the stability and reliability during the operation of the motor.

[0035] In an embodiment of the present utility model, please refer to Figure 1 , the mover assembly 4 includes a magnetic ring 41 and a push rod 42. The magnetic ring 41 is detachably connected to the push rod 42. The push rod 42 passes through the mounting opening 1b. The magnetic ring 41 has a clearance fit with the positioning ring 3, and the magnetic ring 41 is slidably connected to the inner wall of the driving channel 2a.

[0036] In this embodiment, the mover assembly 4 mainly consists of two parts, namely a magnetic ring 41 and a push rod 42. The magnetic ring 41 is made of a high-permeability material to ensure effective interaction with the electromagnetic field of the motor and generate the required linear motion force. The push rod 42 is designed to be able to pass through the mounting opening 1b of the motor and is usually made of a wear-resistant and high-strength material to withstand the forces generated during the movement. The magnetic ring 41 and the push rod 42 are detachably connected by means such as bolt connection or snap connection. This design allows for the individual replacement or maintenance of the magnetic ring 41 or the push rod 42 without disassembling the entire mover assembly 4, improving the convenience of maintenance. The magnetic ring 41 and the inner wall of the driving channel 2a are designed to be slidably connected, which usually involves setting a material or coating with a low coefficient of friction on the contact surface, such as polytetrafluoroethylene (PTFE) or other high-performance plastics, to reduce friction and improve the smoothness of the movement. When the push rod 42 moves within the driving channel 2a of the linear motor 100, the interaction between the magnetic ring 41 and the inner wall generates continuous linear motion to achieve the functional requirements of the motor.

[0037] In an embodiment of the present utility model, please refer to Figure 1 and Figure 3 , the positioning ring 3 is made of an insulating material.

[0038] In this embodiment, the positioning ring 3 is made of a special wear-resistant insulating material, such as polyoxymethylene (POM) or polycarbonate (PC). Such materials have excellent wear resistance and can effectively resist the frictional force generated during the operation of the motor due to the movement of the coil 2 and the rotor assembly 4, thereby extending the service life of the positioning ring 3. At the same time, the selected insulating material ensures good electrical insulation performance, avoids accidental conduction of current, and ensures the safety and reliability of the motor. The positioning ring 3 can be manufactured by injection molding or machining to ensure that its dimensional accuracy and surface finish meet the design requirements. In order to further improve the wear resistance and mechanical strength of the positioning ring 3, special surface treatment technologies, such as coating or heat treatment, can also be used.

[0039] In an embodiment of the present utility model, please refer to Figure 3 , a wire groove 3b is provided on the positioning ring 3, and the wire groove 3b is located on the outer edge of the positioning ring 3.

[0040] In an embodiment, the design of the positioning ring 3 takes into account the layout and protection requirements of the leads of the coil 2. The outer edge of the positioning ring 3 is designed with wire grooves 3b, which are used to guide and fix the wires led out from the coil 2, ensuring the orderly arrangement of the copper wires of the coil 2 inside the motor and preventing the wires from interfering with or rubbing against other components inside the motor. The design of the wire grooves 3b not only provides an effective solution for copper wire management but also helps to improve the electrical safety and mechanical stability of the motor. The wire grooves 3b can be directly machined during the molding stage of the positioning ring 3 using precision machining techniques such as CNC milling, laser cutting, or others to ensure the accuracy of the shape, size, and position of the grooves. The depth and width of the wire grooves 3b will be designed according to the size and quantity of the wires to achieve the best wire accommodation and protection effect.

[0041] In an embodiment of the present utility model, please refer to Figure 1 , the cylinder body 1 is provided with at least one wire outlet hole 1c, and each wire outlet hole 1c is located on the bottom wall of the installation cavity 1a.

[0042] In this embodiment, the cylindrical body 1 is processed with at least one wire outlet hole 1c. The setting of these wire outlet holes 1c is to meet the requirement of the electrical connection between the internal coil 2 of the motor and the external circuit. Each wire outlet hole 1c is located on the bottom wall of the installation cavity 1a, ensuring that the lead wire of the coil 2 can be smoothly led out from the inside of the motor to the external circuit, while maintaining the integrity and tightness of the motor structure. The position, size and shape of the wire outlet hole 1c will be designed according to the specifications and quantity of the lead wire of the coil 2 to ensure that they can adapt to different types of lead wires of the coil 2 and provide sufficient space for electrical connection. The edge of the wire outlet hole 1c will be processed to be smooth and burr-free to avoid damaging the wire, and sealing measures may be adopted, such as using a sealing ring or gasket, to prevent dust or moisture from entering the inside of the motor through the wire outlet hole 1c, thereby protecting the electrical components of the motor from damage.

[0043] In an embodiment of the present utility model, please refer to Figure 1 , the cylindrical body 1 further includes a cover body 11, the cover body 11 is detachably connected to the cylindrical body 1, and the cover body 11 is located at the installation opening 1b.

[0044] In this embodiment, the cylindrical body 1 is provided with a cover body 11, and the cover body 11 and the cylindrical body 1 are detachably connected by means of snap connection or bolt connection, etc., so as to facilitate the assembly, maintenance and overhaul of the motor. The main function of the cover body 11 is to close the installation opening 1b and protect the internal components of the motor from the influence of the external environment, such as dust, moisture and other potential pollutants. The position of the cover body 11 is precisely set at the installation opening 1b to ensure a sealed fit with the cylindrical body 1. The contact surface between the cover body 11 and the cylindrical body 1 is designed with a sealing gasket or sealing ring to achieve an airtight and liquid-tight sealing effect and prevent external substances from invading the inside of the motor. In addition, the design of the cover body 11 also needs to consider the alignment and positioning mechanism with the cylindrical body 1 to ensure that it can maintain an accurate position and stability after connection. When it is necessary to maintain or replace the coil 2, positioning ring 3 or rotor assembly 4, etc. inside the motor, the inside of the motor can be quickly accessed by disassembling the cover body 11. This design not only improves the maintenance efficiency of the motor, but also helps to maintain the long-term stable operation and performance of the motor.

[0045] In an embodiment of the present utility model, please refer to Figure 1 , a first shock-absorbing ring 12 is provided on the side of the cover body 11 facing the installation cavity 1a, and the first shock-absorbing ring 12 is detachably connected to the cover body 11.

[0046] In one embodiment, the design of the linear motor 100 takes into account the requirements of shock absorption and noise reduction. In particular, a first shock-absorbing ring 12 is provided on the side of the cover 11 close to the installation cavity 1a. The first shock-absorbing ring 12 is made of a highly elastic shock-absorbing material, such as rubber, silica gel or other synthetic polymer materials, which have good shock-absorbing performance and durability. The first shock-absorbing ring 12 is detachably connected to the cover 11 by means of snap-fasteners, bolts or adhesives, etc., facilitating replacement or maintenance when necessary without the need to disassemble the entire cover 11. The design of the shock-absorbing ring needs to ensure its tight fit with the edge of the installation cavity 1a to achieve the best shock-absorbing effect. The thickness and hardness of the shock-absorbing ring will be optimized according to the operating conditions of the motor and the required shock-absorbing level to provide sufficient elastic deformation to absorb the vibrations and impacts generated due to the operation of the motor.

[0047] In one embodiment of the present utility model, please refer to Figure 1 , a second shock-absorbing ring 13 is provided on the bottom wall of the installation cavity 1a, and the second shock-absorbing ring 13 is detachably connected to the bottom wall of the installation cavity 1a.

[0048] In this embodiment, in order to further improve the stability of the motor operation and the shock-absorbing effect, a second shock-absorbing ring 13 is designed on the bottom wall of the installation cavity 1a. The second shock-absorbing ring 13 is made of the same or similar highly elastic shock-absorbing material as the first shock-absorbing ring 12, ensuring that when it bears the impact force and vibration generated during the movement of the mover assembly 4, it can effectively absorb and isolate these energies. The connection between the second shock-absorbing ring 13 and the bottom wall of the installation cavity 1a is designed to be detachable, which is not only convenient for assembly during the production process but also for future maintenance and replacement. The second shock-absorbing ring 13 can be installed at a predetermined position on the bottom wall of the installation cavity 1a by means of bolt fastening, snap-fit or adhesive bonding. During the operation of the motor, the second shock-absorbing ring 13 will work in cooperation with the first shock-absorbing ring 12 to form a comprehensive shock-absorbing system, effectively reducing the vibrations and noises transmitted to the outside of the motor due to the movement of the mover assembly 4, thereby improving the service performance of the linear motor 100 and the comfort of the working environment.

[0049] In one embodiment of the present utility model, please refer to Figure 1 , a heat-dissipating silica gel is provided between the coil 2 and the cylinder 1.

[0050] In one embodiment, in order to effectively manage the heat generated during the operation of the motor and improve the thermal stability and long-term operation reliability of the motor, a layer of heat-dissipating silica gel is specifically designed between the coil 2 of the motor and the cylinder 1. This heat-dissipating silica gel is a flexible material with good thermal conductivity, which can form an effective heat conduction path between the coil 2 and the cylinder 1 of the motor, uniformly transfer the heat generated by the coil 2 to the cylinder 1, and then the cylinder 1 dissipates the heat to the external environment. The heat-dissipating silica gel can be evenly filled in the gap between the coil 2 and the cylinder 1 by directly applying it or using a prefabricated silica gel gasket. The selection of silica gel will be based on key parameters such as its thermal conductivity, insulation performance, temperature resistance, and aging resistance to ensure its stable operation in the working environment of the motor. After the motor is assembled, the heat-dissipating silica gel will play its heat-dissipating role, reduce the temperature rise of the coil 2, protect the coil 2 from overheating damage, and also help maintain the performance and lifespan of the internal electronic components of the motor. Through this heat-dissipating design, the linear motor 100 can maintain the best working state under various working conditions and improve its overall performance and reliability.

[0051] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A linear motor, characterized in that, Comprising: A cylinder body (1), the cylinder body (1) being provided with an installation cavity (1a) and an installation opening (1b) communicating with the installation cavity (1a); A coil (2), the coil (2) being located within the installation cavity (1a), and the outer peripheral wall of the coil (2) abutting against the inner peripheral wall of the installation cavity (1a); A positioning ring (3), the positioning ring (3) being detachably connected to the cylinder body (1) and located within the installation cavity (1a); the outer side wall of the coil (2) abuts against the outer side wall of the positioning ring (3); a driving channel (2a) is formed by enclosing the coil (2) and the positioning ring (3); and A mover assembly (4), the mover assembly (4) passing through the installation opening (1b), and the mover assembly (4) being in clearance fit with the inner wall of the driving channel (2a).

2. The linear motor according to claim 1, wherein The linear motor includes at least one positioning ring (3) and at least two coils (2) provided within the installation cavity; Each positioning ring (3) is located between two adjacent coils (2) and abuts against the outer side walls of the two adjacent coils (2); Each positioning ring (3) forms a boss (31) on the opposite sides facing two adjacent coils (2), and each coil (2) is provided with a groove (2b) at one end in contact with the positioning ring (3) for snap-fitting with the corresponding boss (31).

3. The linear motor according to claim 1, wherein The mover assembly (4) includes a magnetic ring (41) and a push rod (42), the magnetic ring (41) being detachably connected to the push rod (42), the push rod (42) passing through the installation opening (1b), the magnetic ring (41) being in clearance fit with the positioning ring (3), and the magnetic ring (41) being slidably connected to the inner wall of the driving channel (2a).

4. The linear motor according to claim 1, wherein The positioning ring (3) is made of an insulating material.

5. The linear motor according to claim 1, wherein The positioning ring (3) is provided with a wire groove (3b) at the outer edge of the positioning ring (3).

6. The linear motor according to claim 1, wherein The cylinder body (1) is provided with at least one wire outlet hole (1c), and each wire outlet hole (1c) is located at the bottom wall of the installation cavity (1a).

7. The linear motor according to any one of claims 1-6, characterized in that, The cylinder body (1) further includes a cover body (11), the cover body (11) being detachably connected to the cylinder body (1), and the cover body (11) being located at the installation opening (1b).

8. The linear motor according to claim 7, wherein One side of the cover body (11) facing the installation cavity (1a) is provided with a first shock-absorbing ring (12), and the first shock-absorbing ring (12) is detachably connected to the cover body (11).

9. The linear motor according to claim 8, wherein The bottom wall of the installation cavity (1a) is provided with a second shock-absorbing ring (13), and the second shock-absorbing ring (13) is detachably connected to the bottom wall of the installation cavity (1a).

10. The linear motor according to any one of claims 1-6, characterized in that, A heat dissipation silica gel is provided between the coil (2) and the cylinder body (1).

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