Linear motor

Abstract

The utility model discloses a linear motor, and relates to the technical field of motor manufacturing, the linear motor comprises a housing, a stator and a mover, the stator comprises a winding, the winding comprises a first coil and a second coil, and the first coil and the second coil are arranged in a staggered winding manner along the axial direction of the first coil; the peripheral walls of the first coil and the second coil abut against the inner wall of the shell, and the winding and the shell define a movement cavity. The mover is located in the motion cavity and slidably connected to the inner peripheral walls of the two coils. In the technical scheme of the utility model, the first coil and the second coil are staggered and wound along the axial direction of the first coil to form a spatially overlapped winding, and under the same condition, the two coils act together when the rotor moves back and forth, and push-pull forces are superposed, so that the thrust output by the linear motor is larger, and the linear motor is more stable. Under the condition that the shape and the size of the linear motor are not changed, larger thrust can be output without thickening a coil copper wire.

Description

Technical Field

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

[0002] Linear motors, as a type of direct-drive motor, are widely used in precision positioning, high-speed motion, and automated equipment. Their working principle involves directly converting electrical energy into linear motion through the electromagnetic interaction between the mover and stator. Typically, linear motors use single-core coils.

[0003] Given a fixed external volume, if you want to increase the thrust of a linear motor, you can only do so by thickening the copper wire in the coil. However, this will increase the current, which will cause the coil to overheat and directly affect the service life of the linear motor. Utility Model Content

[0004] The main objective of this invention is to propose a linear motor that, with a fixed external volume, can generate greater thrust without increasing the thickness of the coil copper wire.

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

[0006] shell;

[0007] The stator includes a winding, the winding comprising a first coil and a second coil, the first coil and the second coil being alternately wound along the axial direction of the first coil; the outer peripheral walls of both the first coil and the second coil abut against the inner wall of the outer casing, the winding and the outer casing forming a moving cavity; and

[0008] The mover is located within the motion cavity and is slidably connected to the inner peripheral wall of the winding.

[0009] In one embodiment, the stator includes two windings, and the stator further includes a positioning ring disposed on the inner wall of the housing; the two windings are respectively connected to the front and rear ends of the positioning ring along the moving part's extension direction; the moving part is slidably connected to the inner peripheral wall of the positioning ring.

[0010] In one embodiment, the positioning ring and the outer shell enclose each other to form two mounting ring grooves distributed front and back along the direction of the mover's ejection, and the two windings are respectively disposed in the two mounting ring grooves.

[0011] In one embodiment, the end of the positioning ring away from the outer casing extends along the front and rear ends of the moving part to form two limiting ring portions, each of the limiting ring portions abutting against a winding to limit the winding within the corresponding mounting ring groove.

[0012] In one embodiment, the mover includes a magnetic ring and a mover rod, with the magnetic ring sleeved on the mover rod; the outer peripheral wall of the magnetic ring is slidably connected to the inner peripheral walls of the two coils.

[0013] In one embodiment, the linear motor further includes an elastic element, the two ends of which are respectively connected to the housing and the moving rod.

[0014] In one embodiment, the moving rod includes a front rod and a rear rod, the front rod being inserted into the magnetic ring, and the rear rod being inserted into the end of the magnetic ring away from the front rod;

[0015] The front rod has a forward protruding ring on its peripheral wall, and the rear rod has a rear protruding ring on its peripheral wall. The forward protruding ring abuts against the front side wall of the magnetic ring along the direction of the mover's extension, and the rear protruding ring abuts against the rear side wall of the magnetic ring along the direction of the mover's extension.

[0016] In one embodiment, the linear motor includes two elastic elements, the peripheral wall of the front rod forms a front sleeve annular groove, and the peripheral wall of the rear rod forms a rear sleeve annular groove.

[0017] One of the elastic elements has its two ends connected to the front end of the housing along the direction of the mover's extension and the front sleeve ring groove, respectively; the other elastic element has its two ends connected to the rear end of the housing along the direction of the mover's extension and the rear sleeve ring groove, respectively.

[0018] In one embodiment, the elastic element is made of silicone.

[0019] In one embodiment, the outer casing includes a cylindrical body and a pressure cap, the pressure cap being detachably connected to the cylindrical body; the outer peripheral walls of the first coil and the second coil abut against the inner peripheral wall of the cylindrical body, and the cylindrical body, the pressure cap, and the windings enclose and form the motion cavity.

[0020] In the technical solution of this utility model, the linear motor includes a housing, a stator, and a mover. The stator includes a winding, which includes a first coil and a second coil. The first coil and the second coil are alternately wound along the axial direction of the first coil. The outer peripheral walls of the first coil and the second coil abut against the inner wall of the housing, and the winding and the housing enclose a motion cavity. The mover is located in the motion cavity and is slidably connected to the inner peripheral walls of the two coils. In the technical solution of this utility model, the first coil and the second coil are alternately wound along the axial direction of the first coil to form a spatially overlapping winding. With a fixed total coil volume, the sum of the number of turns of the first coil and the second coil is the same as the number of turns of a single-core coil. However, since the first coil and the second coil are connected in parallel, their total resistance is less than that of a single-core coil. Therefore, under the same voltage, the sum of the currents flowing through the first coil and the second coil is greater, resulting in a stronger magnetic field formed by the superposition of the first coil and the second coil. When the two coils move back and forth, they work together, and the combined push and pull forces result in a greater thrust output by the linear motor. This allows for a greater thrust output without thickening the coil copper wire, while maintaining the same external volume of the linear motor. Furthermore, since the magnitude of the current flowing through the two coils does not change significantly, the coil temperature does not change drastically, thus not directly affecting the service life of the linear motor. Attached Figure Description

[0021] 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.

[0022] Figure 1 A schematic diagram of the structure of an embodiment of the linear motor provided by this utility model;

[0023] Figure 2 This is a schematic diagram of the winding structure in a linear motor;

[0024] Figure 3 This is a schematic diagram of the outer casing of a linear motor.

[0025] Explanation of icon numbers:

[0026] 1000 linear motor 2a Motion cavity 1 shell 3 Motion 1a Installation ring groove 31 Magnetic ring 11 tube body 32 Moving rod 12 Pressure cap 321 Front Pole 2 stator 3211 lordotic ring 21 winding 321a Front sleeve groove 211 First coil 322 Rear pole 212 Second coil 3221 Rear convex ring 22 Positioning ring 322a Rear sleeve ring groove 221 Limiting ring 4 elastic element

[0027] 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

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] To solve the above problems, this utility model proposes a linear motor 1000. Figures 1 to 3 This is a schematic diagram of one embodiment of the linear motor 1000 of this utility model.

[0032] Please refer to Figure 1 and Figure 2 This utility model proposes a linear motor 1000, including a housing 1, a stator 2, and a mover 3. The stator 2 includes a winding 21, which includes a first coil 211 and a second coil 212. The first coil 211 and the second coil 212 are alternately wound along the axial direction of the first coil 211. The outer peripheral walls of the first coil 211 and the second coil 212 abut against the inner wall of the housing 1. The winding 21 and the housing 1 enclose a motion cavity 2a. The mover 3 is located in the motion cavity 2a and is slidably connected to the inner peripheral walls of the two coils.

[0033] In the technical solution of this utility model, the first coil 211 and the second coil 212 are alternately wound along the axial direction of the first coil 211 to form a spatially overlapping winding 21. With a fixed total coil volume, the sum of the number of turns of the first coil 211 and the second coil 212 is the same as the number of turns of a single-core coil. However, since the first coil 211 and the second coil 212 are connected in parallel, their total resistance is less than that of a single-core coil. Therefore, under the same voltage, the sum of the currents flowing through the first coil 211 and the second coil 212 is greater, resulting in a stronger magnetic field formed by the superposition of the first coil 211 and the second coil 212. When the two coils move back and forth, they work together, and the combined push and pull forces result in a greater thrust output by the linear motor 1000. This allows for a greater thrust output without thickening the coil copper wire, while maintaining the same external volume of the linear motor 1000. Since the magnitude of the current flowing through the two coils does not change significantly, the coil temperature does not change drastically, thus not directly affecting the service life of the linear motor 1000.

[0034] In one embodiment of this utility model, the stator 2 includes two windings 21, and the stator 2 also includes a positioning ring 22, which is disposed on the inner wall of the outer casing 1; the two windings 21 are respectively connected to the front and rear ends of the positioning ring 22 along the pushing direction of the mover 3; the mover 3 is slidably connected to the inner peripheral wall of the positioning ring 22. By fixing the two windings 21 with the positioning ring 22, the air gap of the coil in the linear motor 1000 can be reduced, the magnetic field utilization rate can be improved, the power loss can be reduced, and thus the efficiency and thrust of the linear motor 1000 can be improved.

[0035] Please see Figure 3 In one embodiment of this utility model, the positioning ring 22 and the outer shell 1 enclose two mounting ring grooves 1a distributed front and back along the direction of the movement of the mover 3, and the two windings 21 are respectively disposed in the two mounting ring grooves 1a. The two mounting ring grooves 1a formed by the positioning ring 22 and the outer shell 1 can provide a stable mounting position for the windings 21, ensure the positional accuracy of the windings 21 during installation and operation, reduce the magnetic field instability caused by the displacement or vibration of the windings 21, and thus avoid affecting the stability of the movement of the mover 3.

[0036] In one embodiment of this utility model, the end of the positioning ring 22 away from the outer casing 1 extends along the front and rear ends of the moving part 3 in the pushing direction to form two limiting ring portions 221. Each limiting ring portion 221 abuts against a winding 21 to limit the winding 21 within the corresponding mounting ring groove 1a. The mechanical limiting method further ensures the stability of the winding 21, thereby ensuring that the winding 21 will not loosen due to vibration during operation, thus further improving the operating stability of the linear motor 1000.

[0037] In one embodiment of this invention, the mover 3 includes a magnetic ring 31 and a mover rod 32, with the magnetic ring 31 sleeved on the mover rod 32. The outer peripheral wall of the magnetic ring 31 is slidably connected to the inner peripheral walls of the two coils. The slidable connection between the outer peripheral wall of the magnetic ring 31 and the inner peripheral walls of the two coils allows the mover 3 to form an efficient magnetic field interaction with the coils during movement, optimizing the magnetic field distribution, reducing magnetic field leakage, and thus improving the magnetic field utilization rate.

[0038] In one embodiment of this utility model, the linear motor 1000 further includes an elastic element 4, with its two ends connected to the outer casing 1 and the moving rod 32, respectively. The moving rod 32 reciprocates, and the elastic element 4, due to its own elastic force, applies a pulling force to the moving rod 32 in the opposite direction of its movement. During the extension or retraction of the moving rod 32, the elastic element 4 is stretched to its limit. At this point, the pulling force exerted on the moving rod 32 by the elastic element 4 due to its own elastic force can maintain balance with the pushing force received by the moving rod 32, thus preventing the moving rod 32 from continuing to extend or retract. The elastic force generated by the stretching of the elastic element 4 prevents the moving rod 32 from impacting the inner wall of the outer casing 1, thereby reducing the noise generated by the linear motor 1000.

[0039] In one embodiment of the present invention, the moving rod 32 includes a front rod 321 and a rear rod 322. The front rod 321 is inserted into the magnetic ring 31, and the rear rod 322 is inserted into the end of the magnetic ring 31 away from the front rod 321. The peripheral wall of the front rod 321 is provided with a front protruding ring 3211, and the peripheral wall of the rear rod 322 is provided with a rear protruding ring 3221. The front protruding ring 3211 abuts against the front side wall of the magnetic ring 31 along the pushing direction of the moving rod 3, and the rear protruding ring 3221 abuts against the rear side wall of the magnetic ring 31 along the pushing direction of the moving rod 3. The plug-in design of the front rod 321 and the rear rod 322 has good adaptability and can be easily integrated into the existing linear motor 1000 structure without large-scale changes to the overall design, thereby reducing manufacturing costs and facilitating subsequent technical improvements and functional expansions. By having the front protruding ring 3211 and the rear protruding ring 3221 abut against the front and rear side walls of the magnetic ring 31 respectively, the overall structural stability of the mover 3 can be enhanced. The abutting action of the front protruding ring 3211 and the rear protruding ring 3221 ensures the fixed position of the magnetic ring 31 on the mover rod 32, reducing the risk of displacement or loosening of the magnetic ring 31 during movement.

[0040] In one embodiment of the present invention, the linear motor 1000 includes two elastic members 4. The peripheral wall of the front rod 321 forms a front sleeve ring groove 321a, and the peripheral wall of the rear rod 322 forms a rear sleeve ring groove 322a. The two ends of one elastic member 4 are respectively connected to the front end of the outer shell 1 along the pushing direction of the mover 3 and the front sleeve ring groove 321a, and the two ends of the other elastic member 4 are respectively connected to the rear end of the outer shell 1 along the pushing direction of the mover 3 and the rear sleeve ring groove 322a. The linear motor 1000 includes two elastic elements 4, which are respectively connected to the front and rear ends of the housing 1 and the front sleeve ring groove 321a and the rear sleeve ring groove 322a of the moving rod 32. This enables bidirectional buffering of the moving rod 32 during the pushing and retracting processes. The two elastic elements 4 ensure that the moving rod 32 is effectively constrained by elastic force during both pushing and retracting processes. When the moving rod 32 moves to its limit position, the elastic force of the elastic element 4 can be balanced with the thrust force on the moving rod 32, thereby precisely controlling the stroke range of the moving rod 32, preventing the moving rod 32 from exceeding the predetermined stroke, effectively protecting the structural integrity of the linear motor 1000, and reducing mechanical damage caused by excessive movement.

[0041] It is understood that the elastic element 4 can be made of rubber or silicone. In one embodiment of this utility model, the elastic element 4 is made of silicone. Using silicone as the material of the elastic element 4 ensures that the elastic element 4 has excellent elastic properties, thereby enabling the elastic element 4 to effectively buffer the impact force of the moving rod 32; silicone can maintain stable elasticity during repeated stretching and compression, and will not experience elastic fatigue or deformation due to long-term use, thus ensuring the stability of the linear motor 1000 during long-term operation. In summary, silicone is the preferred material for the elastic element 4.

[0042] In one embodiment of this utility model, the outer shell 1 includes a cylindrical body 11 and a pressure cap 12, the pressure cap 12 being detachably connected to the cylindrical body 11; the outer peripheral walls of the first coil 211 and the second coil 212 abut against the inner peripheral wall of the cylindrical body 11, and the cylindrical body 11, the pressure cap 12, and the winding 21 enclose to form a motion cavity 2a. This makes the assembly and maintenance of the linear motor 1000 more convenient and quick. By disassembling the pressure cap 12, internal components (such as coils, movers 3, etc.) can be easily inspected, repaired, or replaced, thereby reducing maintenance costs and time.

[0043] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A linear motor (1000), characterized in that, include: Outer shell (1); Stator (2), stator (2) includes winding (21), the winding (21) includes a first coil (211) and a second coil (212), the first coil (211) and the second coil (212) are alternately wound along the axial direction of the first coil; the outer peripheral walls of the first coil (211) and the second coil (212) abut against the inner wall of the outer shell (1), the winding (21) and the outer shell (1) enclose to form a moving cavity (2a); and The mover (3) is located in the motion cavity (2a) and is slidably connected to the inner peripheral wall of the winding (21).

2. The linear motor (1000) as described in claim 1, characterized in that, The stator (2) includes two windings (21), and the stator (2) also includes a positioning ring (22), which is disposed on the inner wall of the outer shell (1); the two windings (21) are respectively connected to the front and rear ends of the positioning ring (22) along the pushing direction of the mover (3); the mover (3) is slidably connected to the inner peripheral wall of the positioning ring (22).

3. The linear motor (1000) as described in claim 2, characterized in that, The positioning ring (22) and the outer shell (1) enclose each other to form two mounting ring grooves (1a) distributed back and forth along the pushing direction of the mover (3), and the two windings (21) are respectively disposed in the two mounting ring grooves (1a).

4. The linear motor (1000) as described in claim 3, characterized in that, The positioning ring (22) extends from the end away from the outer shell (1) along the front and rear ends of the push-out direction of the mover (3) to form two limiting ring portions (221). Each of the limiting ring portions (221) abuts against a winding (21) to limit the winding (21) within the corresponding mounting ring groove (1a).

5. The linear motor (1000) as described in claim 1, characterized in that, The mover (3) includes a magnetic ring (31) and a mover rod (32), with the magnetic ring (31) sleeved on the mover rod (32); the outer peripheral wall of the magnetic ring (31) is slidably connected to the inner peripheral wall of the two coils.

6. The linear motor (1000) as described in claim 5, characterized in that, The linear motor (1000) also includes an elastic element (4), the two ends of which are connected to the outer casing (1) and the moving rod (32), respectively.

7. The linear motor (1000) as described in claim 6, characterized in that, The moving rod (32) includes a front rod (321) and a rear rod (322). The front rod (321) is inserted into the magnetic ring (31), and the rear rod (322) is inserted into the end of the magnetic ring (31) away from the front rod (321). The front rod (321) has a protruding front ring (3211) on its peripheral wall, and the rear rod (322) has a protruding rear ring (3221) on its peripheral wall. The front ring (3211) abuts against the front side wall of the magnetic ring (31) along the pushing direction of the mover (3), and the rear ring (3221) abuts against the rear side wall of the magnetic ring (31) along the pushing direction of the mover (3).

8. The linear motor (1000) as described in claim 7, characterized in that, The linear motor (1000) includes two elastic elements (4), the peripheral wall of the front rod (321) forms a front sleeve annular groove (321a), and the peripheral wall of the rear rod (322) forms a rear sleeve annular groove (322a). One of the elastic elements (4) is connected at both ends to the front end of the outer shell (1) along the pushing direction of the mover (3) and the front sleeve ring groove (321a), respectively, and the other elastic element (4) is connected at both ends to the rear end of the outer shell (1) along the pushing direction of the mover (3) and the rear sleeve ring groove (322a).

9. The linear motor (1000) as described in claim 6, characterized in that, The elastic element (4) is made of silicone.

10. The linear motor (1000) as described in any one of claims 1 to 9, characterized in that, The outer casing (1) includes a cylindrical body (11) and a pressure cap (12), the pressure cap (12) being detachably connected to the cylindrical body (11); the outer peripheral walls of the first coil (211) and the second coil (212) abut against the inner peripheral wall of the cylindrical body (11), and the cylindrical body (11), the pressure cap (12) and the winding (21) enclose to form the motion cavity (2a).

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